U.S. patent application number 15/183853 was filed with the patent office on 2017-12-21 for control valve for compressor.
The applicant listed for this patent is Henry C. CHU. Invention is credited to Henry C. CHU.
Application Number | 20170363080 15/183853 |
Document ID | / |
Family ID | 60660812 |
Filed Date | 2017-12-21 |
United States Patent
Application |
20170363080 |
Kind Code |
A1 |
CHU; Henry C. |
December 21, 2017 |
CONTROL VALVE FOR COMPRESSOR
Abstract
A compressor includes a cylinder housing having a number of
pistons, a control chamber communicating with piston casings, a
suction chamber and a discharge chamber communicating with the
piston casings, a control valve includes a receptacle engaged in
the cylinder housing, a valve member engaged in the receptacle for
controlling the pressurized air to flow from the discharge chamber
into the control chamber of the cylinder housing, and a valve
element for controlling a bypass of the pressurized air through the
receptacle. A bellow device is connected to actuate the sliding
member internally, and a sliding member is slidably engaged in the
control space of the receptacle, and to operate the valve element
externally with a solenoid device.
Inventors: |
CHU; Henry C.; (Orange,
CA) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
CHU; Henry C. |
Orange |
CA |
US |
|
|
Family ID: |
60660812 |
Appl. No.: |
15/183853 |
Filed: |
June 16, 2016 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
F04B 49/24 20130101;
F04B 2027/1827 20130101; F04B 27/0878 20130101; F04B 27/1804
20130101; F04B 53/10 20130101; F04B 27/10 20130101; F04B 39/10
20130101; F04B 27/1045 20130101; F04B 27/1009 20130101; F04B 49/22
20130101; F04B 27/1081 20130101; F04B 27/18 20130101 |
International
Class: |
F04B 49/24 20060101
F04B049/24; F04B 27/10 20060101 F04B027/10; F04B 27/08 20060101
F04B027/08; F04B 53/10 20060101 F04B053/10; F04B 27/18 20060101
F04B027/18 |
Claims
1. A control valve for compressor, said compressor comprising: a
cylinder housing including a number of piston casings provided in
said cylinder housing, said cylinder housing including a control
chamber formed therein and communicating with said piston casings
of said cylinder housing, a suction chamber and a discharge chamber
formed in said cylinder housing and communicating with said piston
casings, and arranged for allowing an air to be drawn from said
suction chamber into said piston casings of said cylinder housing,
and for allowing a pressurized air to be discharged into said
discharge chamber of said cylinder housing selectively, a
compartment formed in said cylinder housing, a channel formed in
said cylinder housing and communicating with said compartment and
said suction chamber of said cylinder housing, a conduit formed in
said cylinder housing and communicating with said compartment and
said discharge chamber of said cylinder housing, a pathway formed
in said cylinder housing and communicating with said compartment
and said control chamber of said cylinder housing, a plurality of
pistons slidably received and engaged in said piston casings of
said cylinder housing respectively, a swash plate rotatably
received and engaged in said control chamber of said cylinder
housing with a spindle and adjustable relative to said spindle, and
engaged with said pistons for changing and determining a moving
stroke of said pistons, and a control valve including a receptacle
engaged in said compartment of said cylinder housing, wherein: said
control valve includes a valve member engaged in said receptacle
for controlling the pressurized air to flow from said discharge
chamber and said conduit of said cylinder housing through said
receptacle and into said pathway and said control chamber of said
cylinder housing, and a valve element for controlling a bypass of
the pressurized air through said receptacle.
2. The control valve for compressor as claimed in claim 1, wherein
said receptacle includes a control space formed in said receptacle
and communicating with said pathway of said cylinder housing for
allowing the air with a control pressure (Pc) to flow from said
control space of said receptacle into said control chamber of said
cylinder housing, a discharge space formed in said receptacle and
communicating with said conduit of said cylinder housing for
allowing the air with a discharge pressure (Pd) to flow from said
discharge chamber and said conduit of said cylinder housing through
said discharge space of said receptacle and into said control space
of said receptacle, said valve member is provided between said
discharge space and said control space of said receptacle.
3. The control valve for compressor as claimed in claim 2, wherein
said receptacle includes a sliding member slidably received and
engaged in said control space of said receptacle, and said sliding
member includes a valve piece for selectively engaging with a
primary valve seat of said receptacle and for forming said valve
member between said receptacle and said sliding member.
4. The control valve for compressor as claimed in claim 3, wherein
said sliding member includes a bore formed therein and
communicating with said control space of said receptacle for
forming a bypass from said discharge passage of said receptacle
into said bore of said sliding member and into said control space
of said receptacle, and said valve element is provided in said bore
and said bypass of said sliding member.
5. The control valve for compressor as claimed in claim 4, wherein
said sliding member includes an aperture formed therein and
communicating with said bore of said sliding member and
communicating with said control space of said receptacle.
6. The control valve for compressor as claimed in claim 4, wherein
said sliding member includes a secondary valve seat formed therein,
and a valve part slidably engaged in said bore of said sliding
member for selectively engaging with said secondary valve seat of
said sliding member and for forming said valve element in said
sliding member.
7. The control valve for compressor as claimed in claim 6, wherein
said receptacle includes a bellow device connected to said valve
part for actuating said valve part to selectively engage with said
secondary valve seat of said sliding member.
8. The control valve for compressor as claimed in claim 7, wherein
said receptacle includes a suction space formed in said receptacle
and communicating with said channel of said cylinder housing for
allowing the air with a suction pressure (Ps) to flow from said
suction space of said receptacle into said piston casings of said
cylinder housing selectively, and said bellow device is disposed in
said suction space of said receptacle.
9. The control valve for compressor as claimed in claim 8, wherein
said receptacle includes a suction passage formed therein and
communicating with said suction space of said receptacle.
10. The control valve for compressor as claimed in claim 3, wherein
said receptacle includes a solenoid device engaged with said
sliding member for selectively actuating said sliding member to
engage with said primary valve seat of said receptacle.
11. The control valve for compressor as claimed in claim 10,
wherein said solenoid device includes a coil attached to said
receptacle, and a plunger slidably engaged in said coil and engaged
with said sliding member for selectively actuating said sliding
member to close and open said valve member.
12. The control valve for compressor as claimed in claim 2, wherein
said receptacle includes a discharge passage formed therein and
communicating with said discharge space of said receptacle, and a
control passage formed in said receptacle and communicating with
said control space of said receptacle.
Description
BACKGROUND OF THE INVENTION
1. Field of the Invention
[0001] The present invention relates to a control valve for
compressor, and more particularly to an internally and externally
controlled control valve for a variable displacement compressor of
a refrigeration system including an improved and simplified
structure or configuration for allowing the compressor of the
refrigeration system to be effectively actuated or operated by the
internally and externally controlled control valve.
2. Description of the Prior Art
[0002] Typical refrigerating systems, such as the automotive air
conditioning systems comprise a refrigerant circuit having a
condenser, an evaporator, and a wobble plate type or slant plate
type compressor with a variable displacement mechanism, in which
the variable displacement mechanisms may be controlled either
internally or externally.
[0003] For example, U.S. Pat. No. 5,071,321 to Skinner et al., U.S.
Pat. No. 5,092,741 to Taguchi, U.S. Pat. No. 5,152,673 to Pettitt
et al., and U.S. Pat. No. 5,167,492 to Kent et al. disclose several
of the typical variable displacement mechanisms for wobble plate
type or slant plate type compressors controlled internally with
bellow devices or the like, and controlled by a suction chamber
pressure and in response to a discharge chamber pressure and a
crankcase pressure formed inside a crankcase chamber.
[0004] A "bellow" device, such as a sylphon bellow is a thin-walled
cylindrical metal bellow consisting of elements arranged responding
to external or internal fluid pressure, and used in a
pressure-governing system. The control mechanism comprises a
passage way communication between the crankcase chamber and
discharge chamber. A control valve is in response to a pressure
difference between the crankcase chamber and the discharge chamber
and provides a fluid path between the crankcase chamber and the
discharge chamber to allow refrigerant from the discharge chamber
to be injected into the crankcase chamber through the fluid path
provided by the control valve under the influence of the pressure
of the pressure difference inside the suction chamber. The "bellow"
device is responsive by a suction pressure connected to the suction
chamber for allowing the wobble plate type or slant plate type
compressors to be controlled internally with bellow devices or the
like.
[0005] However, the typical variable displacement mechanisms for
wobble plate type or slant plate type compressors should normally
be actuated or operated at a rate ranging between 6-100%, and may
not be shut off completely while in use, without an outside of
compressor control device, such as a clutch device or a solenoid
device.
[0006] U.S. Pat. No. 5,240,385 to Nashiro et al., U.S. Pat. No.
5,586,870 to Kawaguchi et al., U.S. Pat. No. 6,241,484 to
Hiltemann, and U.S. Pat. No. 6,250,891 to Kawaguchi et al. disclose
the other typical variable displacement mechanisms for wobble plate
type or slant plate type compressors controlled externally with
vehicle electrical control unit (ECU) or vehicle electrical control
module (ECM), including a "solenoid" inside the control valve and
disposed between a discharge chamber and a crankcase chamber, for
controlling a crankcase pressure in response to a signal generated
outside of the compressor, such as the vehicle electrical control
unit (ECU) or vehicle electrical control module (ECM).
[0007] However, the typical variable displacement mechanisms for
wobble plate type or slant plate type compressors may only be
controlled externally with the signals from the vehicle electrical
control unit (ECU) or vehicle electrical control module (ECM), and
should normally be actuated or operated at a fast speed such that
the working life of the typical variable displacement mechanisms
will be greatly reduced or decreased.
[0008] U.S. Pat. No. 5,025,636 to Terauchi discloses a further
typical variable displacement mechanism for wobble plate type or
slant plate type compressor that may be controlled both internally
with such as a bellow device and externally with such as a solenoid
device.
[0009] However, the typical variable displacement mechanisms
include a complicated structure or configuration that may not be
easily and quickly made or manufactured and that may include a
complicated making or manufacturing procedure and that may include
a greatly increased manufacturing cost or the like. The internally
controlled mechanism and the externally controlled mechanism are
spaced or separated from each other, but not in one control body
unit.
[0010] The present invention has arisen to mitigate and/or obviate
the afore-described disadvantages of the conventional control
valves for compressors.
SUMMARY OF THE INVENTION
[0011] The primary objective of the present invention is to provide
a control valve for compressor including an improved and simplified
structure or configuration for allowing the compressor of the
refrigeration system to be effectively actuated or operated by the
internally and externally controlled control valve.
[0012] The other objective of the present invention is to provide a
control valve for compressor including an improved and simplified
structure or configuration having both internally controlled
mechanism and externally controlled mechanism in one control body
unit.
[0013] In accordance with one aspect of the invention, there is
provided a control valve for compressor, the compressor comprising
a cylinder housing including a number of piston casings provided in
the cylinder housing, the cylinder housing including a control
chamber formed therein and communicating with the piston casings of
the cylinder housing, a suction chamber and a discharge chamber
formed in the cylinder housing and communicating with the piston
casings, and arranged for allowing an air to be drawn from the
suction chamber into the piston casings of the cylinder housing,
and for allowing a pressurized air to be discharged into the
discharge chamber of the cylinder housing selectively, a
compartment formed in the cylinder housing, a channel formed in the
cylinder housing and communicating with the compartment and the
suction chamber of the cylinder housing, a conduit formed in the
cylinder housing and communicating with the compartment and the
discharge chamber of the cylinder housing, a pathway formed in the
cylinder housing and communicating with the compartment and the
control chamber of the cylinder housing, a number of pistons
slidably received and engaged in the piston casings of the cylinder
housing respectively, a swash plate rotatably received and engaged
in the control chamber of the cylinder housing with a spindle and
adjustable relative to the spindle to different angles, and engaged
with the pistons for changing and determining a moving stroke of
the pistons, and a control valve including a receptacle engaged in
the compartment of the cylinder housing, the control valve includes
a valve member engaged in the receptacle for controlling the
pressurized air to flow from the discharge chamber and the conduit
of the cylinder housing through the receptacle and into the pathway
and the control chamber of the cylinder housing, and a valve
element for controlling a bypass of the pressurized air through the
receptacle and for controlling the pressurized air to flow from the
discharge chamber to the control chamber of the cylinder housing in
order to control or adjust the swash plate relative to the spindle
to different angles.
[0014] The receptacle includes a control space formed in the
receptacle and communicating with the pathway of the cylinder
housing for allowing the air with a control pressure (Pc) to flow
from the control space of the receptacle into the control chamber
of the cylinder housing, a discharge space formed in the receptacle
and communicating with the conduit of the cylinder housing for
allowing the air with a discharge pressure (Pd) to flow from the
discharge chamber and the conduit of the cylinder housing through
the discharge space of the receptacle and into the control space of
the receptacle, the valve member is provided between the discharge
space and the control space of the receptacle for controlling the
pressurized air to flow from the discharge space to the control
space of the receptacle.
[0015] The receptacle includes a sliding member slidably received
and engaged in the control space of the receptacle, and the sliding
member includes a valve piece for selectively engaging with a
primary valve seat of the receptacle and for forming the valve
member between the receptacle and the sliding member. The sliding
member includes a bore formed therein and communicating with the
control space of the receptacle for forming a bypass from the
discharge passage of the receptacle into the bore of the sliding
member and into the control space of the receptacle, and the valve
element is provided in the bore and the bypass of the sliding
member for controlling the pressurized air to flow from the
discharge space of the receptacle into the bore of the sliding
member.
[0016] The sliding member includes an aperture formed therein and
communicating with the bore of the sliding member and communicating
with the control space of the receptacle. The sliding member
includes a secondary valve seat formed therein, and a valve part
slidably engaged in the bore of the sliding member for selectively
engaging with the secondary valve seat of the sliding member and
for forming the valve element in the sliding member. The receptacle
includes a bellow device connected to the valve part for actuating
the valve part to selectively engage with the secondary valve seat
of the sliding member and to be selectively disengaged from the
secondary valve seat of the sliding member.
[0017] The receptacle includes a suction space formed in the
receptacle and communicating with the channel of the cylinder
housing for allowing the air with a suction pressure (Ps) to flow
from the suction space of the receptacle into the piston casings of
the cylinder housing selectively, and the bellow device is disposed
in the suction space of the receptacle. The receptacle includes a
suction passage formed therein and communicating with the suction
space of the receptacle for allowing the air to flow into the
suction space of the receptacle.
[0018] The receptacle includes a solenoid device engaged with the
sliding member for selectively actuating the sliding member to
engage with or disengage from the primary valve seat of the
receptacle. The solenoid device includes a coil attached to the
receptacle, and a plunger slidably engaged in the coil and engaged
with the sliding member for selectively actuating the sliding
member to close and open the valve member. The receptacle includes
a discharge passage formed therein and communicating with the
discharge space of the receptacle, and a control passage formed in
the receptacle and communicating with the control space of the
receptacle for allowing the pressurized air to flow from the
control space to the control passage of the receptacle, and then
into the control chamber of the cylinder housing.
[0019] Further objectives and advantages of the present invention
will become apparent from a careful reading of the detailed
description provided hereinbelow, with appropriate reference to the
accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0020] FIG. 1 is a partial cross sectional view of a compressor
having a control valve in accordance with the present
invention;
[0021] FIG. 2 is an enlarged partial perspective view illustrating
the control valve for the compressor;
[0022] FIG. 3 is a partial cross sectional view of the control
valve for compressor, taken along lines 3-3 of FIG. 2; and
[0023] FIGS. 4, 5 are partial cross sectional views similar to FIG.
3, illustrating the operation of the control valve for
compressor.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
[0024] Referring to the drawings, and initially to FIG. 1, a
compressor in accordance with the present invention comprises an
outer receptacle or cylinder housing 10, and a number of pistons 11
slidably received or engaged in piston casings 12 that are formed
and provided in the cylinder housing 10, and actuated or operated
to move in a reciprocating action in the cylinder housing 10 for
generating a pressurized air, the cylinder housing 10 includes a
crank case chamber or control chamber 13 formed therein and
communicating with the piston casings 12, and a swash plate 14 is
rotatably received or engaged in the control chamber 13 of the
cylinder housing 10 with a spindle 15 and connected or coupled to
and engaged with the pistons 11 for changing and determining the
moving stroke of the pistons 11, in which the spindle 15 is
substantially parallel to the pistons 11. A driven pulley 16 is
connected or coupled to the spindle 15 and rotated in concert with
the spindle 15.
[0025] When the swash plate 14 is tilted or adjusted relative to
the spindle 15 to a substantially upright angle that is
substantially perpendicular to the spindle 15, the moving stroke of
the pistons 11 is decreased to the smallest; but when the swash
plate 14 is tilted or adjusted relative to the spindle 15 to a
substantially flat angle that is substantially parallel to the
spindle 15, the moving stroke of the pistons 11 will be increased
to the greatest moving stroke, for example, and the pressurized air
will be generated in the greatest efficiency. The cylinder housing
10 further includes a suction chamber 17 and a discharge chamber 18
formed therein and communicating with the piston casings 12 and
arranged for allowing the air to be drawn from the suction chamber
17 into the piston casings 12, and for allowing the pressurized air
to be discharged into the discharge chamber 18 when or after the
pressurized air is generated by or with the pistons 11.
[0026] The cylinder housing 10 further includes a receiving chamber
or compartment 19 formed therein and communicating with the suction
chamber 17 and the discharge chamber 18 and the control chamber 13
of the cylinder housing 10 with a channel 20, a conduit 21 and a
pathway 22 respectively, and the compartment 19 of the cylinder
housing 10 may be provided for receiving or engaging with a control
valve 3 that is provided for actuating or operating the compressor
in accordance with the present invention. The compressor in
accordance with the present invention further comprises a
refrigerant circuit including at least an evaporator 23, an
expansion valve 24 and a condenser 25 connected or coupled in
series between the suction chamber 17 and the discharge chamber 18
of the cylinder housing 10 for air conditioning purposes. The
above-described structure or configuration for the pistons 11 and
the swash plate 14 and the evaporator 23 and the expansion valve 24
and the condenser 25 is typical and will not be described in
further details.
[0027] Referring next to FIGS. 2-5, the control valve 3 for the
compressor in accordance with the present invention includes a
control valve body or receptacle 30 having a suction space 31
formed therein, such as formed in the upper portion thereof, a
suction passage 32 formed therein, such as formed in the upper
portion thereof and communicating with the suction space 31 of the
receptacle 30 and also communicating with the channel 20 of the
cylinder housing 10 for allowing the air with a suction pressure
(Ps) to be flown from the suction space 31 of the receptacle 30 and
through the channel 20 and into the piston casings 12 of the
cylinder housing 10 selectively, and the suction space 31 of the
receptacle 30 is provided for receiving or engaging with a bellow
device 40, such as a thin-walled cylindrical metal bellow
consisting of elements arranged responding to external or internal
fluid pressure, and used in a pressure-governing system, and
responsive by the suction pressure (Ps) connected to the suction
chamber 17 of the cylinder housing 10.
[0028] For example, when the temperature and/or the pressure in the
outer environment and/or the suction pressure (Ps) reach a
predetermined value, such as 40 psi, the bellow device 40 will be
compressed or actuated or operated by the suction pressure (Ps) in
order to actuate or operate the control valve 3 to work the
compressor, this is the so-called internally controlled wobble
plate type or slant plate type or swash plate type compressors. The
compressor will be continuously actuated or operated by the suction
pressure (Ps) that is ranged between 30 and 40 psi, for example,
and the compressor will be idled or the like when the suction
pressure (Ps) is lower than 30 psi, for example. The
above-described structure or configuration for the bellow device 40
is also typical and will not be described in further details.
[0029] The receptacle 30 further includes a crank case or control
space 33 formed in the middle or intermediate portion of the
receptacle 30, and a crank case or control passage 34 is also
formed in the middle or intermediate portion of the receptacle 30
and communicating with the control space 33 of the receptacle 30
and also communicating with the pathway 22 of the cylinder housing
10 for allowing the air with a control pressure (Pc) to be flown
from the control space 33 of the receptacle 3 and through the
pathway 22 and into the control chamber 13 of the cylinder housing
10 in order to control or tilt or adjust the swash plate 14
relative to the spindle 15 of the cylinder housing 10. The
receptacle 30 further includes an orifice or discharge space 35
formed therein and communicating with the suction space 31 and the
control space 33 of the receptacle 30, and a discharge passage 36
also formed in the middle or intermediate portion of the receptacle
30 and communicating with the discharge space 35 of the receptacle
30 and also communicating with the conduit 21 of the cylinder
housing 10 for allowing the pressurized air generated by or with
the pistons 11 with a discharge pressure (Pd) to flow into the
discharge passage 36 and/or the control space 33 of the receptacle
30.
[0030] A container or sliding member 41 is slidably received or
engaged in the control space 33 and/or the discharge space 35 of
the receptacle 30, and includes a shoulder or valve piece 42 for
selectively contacting or engaging with a primary valve seat 37 of
the receptacle 30 and for forming or defining a primary valve
member 43 between the receptacle 30 and the sliding member 41 and
for controlling the pressurized air (Pd) to flow from the discharge
passage 36 into the control space 33 of the receptacle 30. The
sliding member 41 includes an inner bore 44 and an aperture 45
formed therein and communicating with each other and also
communicating with the control space 33 of the receptacle 30 for
forming a manifold or bypass 440 of the pressurized air from the
discharge passage 36 of the receptacle 30 into the bore 44 and the
aperture 45 of the sliding member 41 and into the control space 33
of the receptacle 30, and the aperture 45 of the sliding member 41
is communicating with the control space 33 of the receptacle 30,
and the inner bore 44 of the sliding member 41 is partially
communicating with the discharge passage 36 of the receptacle 30
for allowing the pressurized air to partially flow from the
discharge passage 36 of the receptacle 30, through the manifold or
bypass 440 and into the bore 44 and the aperture 45 of the sliding
member 41 selectively.
[0031] The sliding member 41 further includes an inner socket or
secondary valve seat 46 formed or provided therein, and another
valve ball or piece or part 47 is slidably received or engaged in
the bore 44 of the sliding member 41 and attached or mounted or
secured to the bellow device 40 and moved in concert with the
bellow device 40 and arranged for allowing the valve part 47 to be
actuated or operated or moved by the bellow device 40 to
selectively contact or engage with the secondary valve seat 46 of
the sliding member 41 in order to form or define a secondary valve
element 48 within the sliding member 41, and to control the
pressurized air (Pd) to flow from the discharge passage 36 into the
bore 44 and the aperture 45 of the sliding member 41 and then into
the control space 33 of the receptacle 30 and then to selectively
flow out through the control passage 34 of the receptacle 30, such
that the bypass of the pressurized air (Pd) from the discharge
passage 36 of the receptacle 30 into the bore 44 of the sliding
member 41 and then into the control space 33 of the receptacle 30
may be controlled with the valve part 47 and the secondary valve
seat 46 of the valve element 48 and thus may be controlled
internally with the valve part 47 and the bellow device 40.
[0032] The control valve 3 further includes a solenoid device 5
having a coil 50 disposed or attached or mounted or secured in the
lower or bottom portion of the receptacle 30, and a plunger 51
slidably received or engaged in the coil 50 and contacted or
engaged with the sliding member 41, for being actuated or operated
by the coil 50 and for selectively actuating or forcing or moving
the sliding member 41 to contact or engage with the primary valve
seat 37 of the receptacle 30 (FIGS. 4, 5) and for closing or
opening the valve member 43 selectively. A spring biasing member 52
is provided and engaged between the receptacle 30 and the sliding
member 41 for biasing and forcing or moving the valve piece 42 of
the valve member 43 from the primary valve seat 37 of the
receptacle 30 or of the valve member 43 (FIG. 3) and thus for
allowing the pressurized air (Pd) to freely flow from the discharge
passage 36 into the control space 33 of the receptacle 30.
[0033] In operation, as shown in FIG. 3, when the coil 50 of the
solenoid device 5 is not actuated or operated or when it is not
required to be air conditioned, or when the suction pressure (Ps)
is lower than a predetermined low value, such as 30 psi, the
pressurized air (Pd) may freely flow from the discharge passage 36
into the control space 33 of the receptacle 30 through the valve
member 43, and then into the control chamber 13 of the cylinder
housing 10 in order to tilt or adjust the swash plate 14 relative
to the spindle 15 of the cylinder housing 10 to the substantially
upright angle that is substantially perpendicular to the spindle
15, the moving stroke of the pistons 11 is decreased to the
smallest and the work done by the compressor is decreased to almost
zero.
[0034] As shown in FIGS. 4 and 5, when it is required to be air
conditioned, the coil 50 of the solenoid device 5 may be actuated
or operated or energized with a signal generated outside of the
compressor, such as the vehicle electrical control unit (ECU) or
vehicle electrical control module (ECM), and the sliding member 41
may be actuated or operated or moved by the plunger 51 and/or the
coil 50 of the solenoid device 5 to contact or engage with the
primary valve seat 37 of the receptacle 30 and for closing the
valve member 43 selectively and for preventing the pressurized air
(Pd) from directly flow from the discharge passage 36 through the
valve member 43 that is formed by the primary valve seat 37 of the
receptacle 30 and the valve piece 42 of the valve member 43, and
then into the control space 33 of the receptacle 30.
[0035] As also shown in FIG. 4, when it is required to be air
conditioned and when the temperature and/or the pressure in the
outer environment and/or the suction pressure (Ps) reach the
predetermined high value, such as 40 psi, the bellow device 40 will
be compressed or actuated or operated by the suction pressure (Ps)
in order to actuate or operate or move the valve part 47 to contact
or engage with the secondary valve seat 46 of the sliding member 41
in order to close the valve element 48, at this moment, no
pressurized air (Pd) may flow from the discharge passage 36 into
the control space 33 of the receptacle 30 and no pressurized air
(Pd) may be supplied into the control chamber 13 of the cylinder
housing 10, and the swash plate 14 may be tilted or adjusted
relative to the spindle 15 of the cylinder housing 10 to the
substantially flat that is substantially parallel to the spindle
15, the moving stroke of the pistons 11 will be increased to the
greatest moving stroke, and the pressurized air will be generated
in the greatest efficiency.
[0036] As also shown in FIG. 5, when the suction pressure (Ps) is
ranged between 30 and 40 psi, for example, the valve part 47 of the
bellow device 40 or of the valve element 48 will be compressed or
actuated or operated by the suction pressure (Ps) in order to
partially open the valve element 48 and thus for allowing the
pressurized air (Pd) to bypass and to partially flow from the
discharge passage 36 of the receptacle 30 into the bore 44 of the
sliding member 41 and then into the control space 33 of the
receptacle 30, and thus for allowing the compressor will be
continuously actuated or operated by the suction pressure (Ps)
internally with the bellow device 40. It is to be noted that the
valve member 43 is closed at this moment, and will not be further
moved or opened by the plunger 51 and/or the coil 50 of the
solenoid device 5. It is further to be noted that the valve element
48 and the valve member 43 are formed or provided within the
receptacle 30, and the valve element 48 may be controlled
internally with the valve part 47 and the bellow device 40, and the
valve member 43 may be controlled externally with the plunger 51
and/or the coil 50 of the solenoid device 5.
[0037] Accordingly, the control valve for compressor in accordance
with the present invention includes an improved and simplified
structure or configuration for allowing the compressor of the
refrigeration system to be effectively actuated or operated by the
internally and externally controlled control valve, and having both
internally controlled mechanism and externally controlled mechanism
in one control body unit.
[0038] Although this invention has been described with a certain
degree of particularity, it is to be understood that the present
disclosure has been made by way of example only and that numerous
changes in the detailed construction and the combination and
arrangement of parts may be resorted to without departing from the
spirit and scope of the invention as hereinafter claimed.
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