U.S. patent application number 11/729243 was filed with the patent office on 2007-10-11 for reciprocating pump apparatus.
This patent application is currently assigned to Maruyama Mfg. Co., Inc.. Invention is credited to Nobuo Tojo.
Application Number | 20070237651 11/729243 |
Document ID | / |
Family ID | 38575489 |
Filed Date | 2007-10-11 |
United States Patent
Application |
20070237651 |
Kind Code |
A1 |
Tojo; Nobuo |
October 11, 2007 |
Reciprocating pump apparatus
Abstract
An objective is to provide a reciprocating pump apparatus which
can change a position where an adaptor to be fixed to a support is
attached, while having a simple form. In a reciprocating pump
apparatus 10 having a crankshaft 14 directly connected to an output
shaft of a driving source, positions of bolts 22a to 22d for fixing
a bearing case 20 for closing an open end part of a crankcase 16 to
the crankcase are determined such that an adaptor 40 for fixing the
reciprocating pump apparatus to a support 58 is fastened to the
crankcase together with the bearing case in a positionally
changeable fashion. Since the position of the adaptor is
changeable, the degree of freedom in the layout of apparatus
improves in this structure. Also, since bolts for fixing a manifold
to the crankcase are utilized for attaching the adaptor, a simple
form is attained.
Inventors: |
Tojo; Nobuo; (Togane-shi,
JP) |
Correspondence
Address: |
OSHA LIANG L.L.P.
1221 MCKINNEY STREET, SUITE 2800
HOUSTON
TX
77010
US
|
Assignee: |
Maruyama Mfg. Co., Inc.
Tokyo
JP
|
Family ID: |
38575489 |
Appl. No.: |
11/729243 |
Filed: |
March 28, 2007 |
Current U.S.
Class: |
417/269 ;
417/343; 417/364 |
Current CPC
Class: |
F04B 53/22 20130101;
F04B 53/16 20130101 |
Class at
Publication: |
417/269 ;
417/364; 417/343 |
International
Class: |
F04B 27/08 20060101
F04B027/08; F04B 35/00 20060101 F04B035/00; F04B 17/00 20060101
F04B017/00 |
Foreign Application Data
Date |
Code |
Application Number |
Apr 7, 2006 |
JP |
2006-106492 |
Claims
1. A reciprocating pump apparatus comprising: a crankcase, having
at least one open end part, for supporting a crankshaft; a closing
member, removably fixable to the crankcase with a first set of
bolts so as to close the open end part of the crankcase; and a pump
case of a reciprocating pump, removably fixable to a side face of
the crankcase with a second set of bolts; wherein a position of the
first set of bolts for fixing the closing member to the crankcase
is determined such that an adaptor for fixing the reciprocating
pump apparatus to a support is fastened to the crankcase together
with the closing member in a positionally changeable fashion.
2. A reciprocating pump apparatus according to claim 1, wherein the
first set of bolts are arranged symmetrically about a first plane,
which is including the center axes of the reciprocating pump and
the axis of rotation of the crankshaft.
3. A reciprocating pump apparatus according to claim 1, wherein the
first set of bolts are arranged symmetrically about a third plane,
which is orthogonal to the first plane and includes the axis of
rotation of the crankshaft.
4. A reciprocating pump apparatus according to claim 1, wherein the
bolts of the first set are equally distanced from the axis of
rotation of the crankshaft.
5. A reciprocating pump apparatus according to claim 1, wherein the
bolts of the first set are provided, having the same angles around
the axis of rotation in the center.
6. A reciprocating pump apparatus according to claim 1, wherein the
position of the adaptor is vertically changeable; and a position of
the second set of bolts, for fixing the pump case to the crankcase,
is determined such that the pump case is fixable to the crankcase
in a vertically reversed fashion.
7. A reciprocating pump apparatus according to claim 6, wherein the
second set of bolts are arranged symmetrically about the first
plane.
8. A reciprocating pump apparatus according to claim 6, wherein the
second set of bolts are arranged symmetrically about the second
plane, which is orthogonal to the first plane and includes the
center axis of the reciprocating pump.
Description
BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] The present invention relates to a reciprocating pump
apparatus such as plunger pump and piston pump.
[0003] 2. Related Background Art
[0004] Reciprocating pump apparatus such as plunger pumps and
piston pumps include those of types in which a crankshaft is
directly connected to an output shaft of a driving source such as
engine or motor. However, such reciprocating pump apparatus
directly connected to driving sources have also been demanded for
use in a stationary state, i.e., with their crankshafts fixed to a
support such as apparatus frame without being directly connected to
the output shaft of the driving source, while receiving a driving
force through an appropriate transmission mechanism.
[0005] For such a demand, an adaptor (also known as "rail") is
attached to a crankcase, so as to be fixed to a support in the pump
apparatus disclosed in the following Patent Document 1, for
example. [0006] [Patent Document 1] Japanese Utility Model
Application Laid-Open No. SHO 62-122167
SUMMARY OF THE INVENTION
[0007] In the reciprocating apparatus disclosed in the
above-mentioned Patent Document 1, a boss for attaching the adaptor
to the crankcase is provided on the outer surface of the crankcase,
and the adaptor is fixed to the boss with a bolt.
[0008] Providing the crankcase with the boss, however, complicates
the form of the crankcase, necessitates extra materials, and
increases labor and cost of manufacture.
[0009] Also, since the boss is provided only in the lower part of
the crankcase, the adaptor cannot be attached to the upper part in
the reciprocating pump apparatus disclosed in the above-mentioned
Patent Document 1. This limits the degree of freedom in the layout
of the reciprocating pump apparatus. Though the boss may be
provided in the upper part of the crankcase as a matter of course,
this will further complicate the crankcase form and so forth.
[0010] Therefore, it is an object of the present invention to
provide a reciprocating pump apparatus which can change a position
where an adaptor is attached, while having a simple form.
[0011] For achieving the above-mentioned object, the present
invention provides a reciprocating pump apparatus (10) comprising:
a crankcase (16), having at least one open end part, for supporting
a crankshaft (14); a closing member (20), removably fixable to the
crankcase (16) with a first set of bolts (22a to 22d) so as to
close the open end part of the crankcase (16); and a pump case (26)
of a reciprocating pump (12), removably fixable to a side face of
the crankcase (16) with a second set of bolts (28); wherein a
position of the first set of bolts (22a to 22d) for fixing the
closing member (20) to the crankcase (16) is determined such that
an adaptor (40) for fixing the reciprocating pump apparatus (10) to
a support (58) is fastened to the crankcase (16) together with the
closing member (20) in a positionally changeable fashion.
[0012] Preferably, the first set of bolts (22a to 22d) are arranged
symmetrically about a first plane (P1), which is including the
center axes of the reciprocating pump (12) and the axis of rotation
of the crankshaft (14).
[0013] Preferably, the first set of bolts (22a to 22d) are arranged
symmetrically about a third plane (P3), which is orthogonal to the
first plane (P1) and includes the axis of rotation of the
crankshaft (14).
[0014] Preferably, the bolts (22a to 22d) of the first set are
equally distanced from the axis of rotation of the crankshaft
(14).
[0015] Preferably, the bolts (22a to 22d) of the first set are
provided, having the same angles around the axis of rotation in the
center.
[0016] When the position of the adaptor (40) is vertically
changeable, it will be preferred if a position of the second set of
bolts (28), for fixing the pump case (26) to the crankcase (16), is
determined such that the pump case (26) is fixable to the crankcase
(16) in a vertically reversed fashion.
[0017] Preferably, the second set of bolts (28) are arranged
symmetrically about the first plane (P1).
[0018] Preferably, the second set of bolts (28) are arranged
symmetrically about the second plane (P2), which is orthogonal to
the first plane (P1) and includes the center axis of the
reciprocating pump (12).
[0019] Since the position of the adaptor used for turning the
originally driving source direct connection type reciprocating pump
apparatus into a stationary type is changeable, the degree of
freedom in the layout of apparatus improves in the structure
mentioned above.
[0020] Since the bolt for fixing the closing member, which is a
member essential for the reciprocating pump apparatus, to the
crankcase is utilized for attaching the adaptor, there is no need
to provide the crankcase with bosses or turn it into other special
forms, whereby the crankcase can attain a simple form. This can
reduce the labor and cost of manufacturing the reciprocating pump
apparatus.
BRIEF DESCRIPTION OF THE DRAWINGS
[0021] [FIG. 1] A perspective view showing an embodiment of the
reciprocating pump apparatus in accordance with the present
invention.
[0022] [FIG. 2] A perspective view showing the reciprocating pump
apparatus in accordance with the present invention seen in a
direction opposite from that of FIG. 1.
[0023] [FIG. 3] A view showing a state where the reciprocating pump
apparatus shown in FIG. 1 is fixed onto a support through an
adaptor, in which (a) is a front view, (b) is a left side view, and
(c) is a right side view.
[0024] [FIG. 4] A view showing another state where the
reciprocating pump apparatus shown in FIG. 1 is fixed onto the
support through the adaptor, in which (a) is a front view, (b) is a
left side view, and (c) is a right side view.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0025] In the following, preferred embodiments of the reciprocating
apparatus in accordance with the present invention will be
explained in detail with reference to the drawings. Parts identical
or equivalent to each other in the drawings will be referred to
with numerals identical to each other. In this specification and
accompanying claims, "upper" and "lower" are based on the state
where the reciprocating pump apparatus is fixed to a support (see
FIGS. 3 and 4).
[0026] FIG. 1 is a perspective view showing an embodiment of the
reciprocating pump apparatus in accordance with the present
invention, whereas FIG. 2 is a perspective view thereof when seen
in a direction opposite to that of FIG. 1. The reciprocating pump
apparatus 10 in accordance with the depicted embodiment is of a
triple type in which three plunger pumps (reciprocating pumps) 12
are provided in parallel. Forces for driving the plunger pumps 12
are transmitted through a crankshaft 14. The depicted reciprocating
pump apparatus 10 is of a driving source direct connection type in
which the crankshaft 14 is directly connected to an output shaft of
a driving source such as engine or motor.
[0027] The crankshaft 14 is rotatably held within the crankcase 16.
The crankcase 16 has a bottomed cylindrical form (bell form) having
one end closed and the other end opened. A bearing is placed within
the crankcase 16 on its closed end part 18 side, so as to support
one end of the crankshaft 14. A bearing case (closing member) 20
provided with a bearing is removably fixed to the open end part of
the crankcase 16 with bolts 22a to 22d (a first set of bolts), so
as to close the open end part. The crankshaft 14 is supported by
the bearing within the bearing case 20 and further penetrates
through the bearing case 20, thereby projecting to the outside. In
this embodiment, the projected end part of the crankshaft 14 is
formed with a key groove 24 so as to make it easier to connect
directly with the output shaft of the driving source.
[0028] Each plunger pump 12 is arranged such that its center axis
(i.e., the center axis of its cylinder) is orthogonal to the axis
of rotation of the crankshaft 14. The three plunger pumps 12 are
arranged in a row such that their center axes are parallel to each
other while being equally spaced along the axis of rotation of the
crankshaft 14. A manifold 26 which also functions as a pump case
for these plunger pumps 12 is removably fixed to a side face of the
crankcase 16 with bolts 28 (a second set of bolts).
[0029] The bolts 28 for fixing the manifold 26 to the crankcase 16
are passed through their corresponding through holes 30 formed in
the manifold 26, so as to engage screw holes 32 provided in a side
face of the crankcase 16. As can also be seen from (a) of FIG. 3,
there are a plurality of (8 in this embodiment) screw holes 32,
which are arranged 4 by 4 on the upper and lower sides while being
symmetrical about a first plane P1 including the center axes of the
plunger pumps 12 and the axis of rotation of the crankshaft 14.
Namely, the bolts 28 are arranged symmetrically about the first
plane PI. The screw holes 32 are also formed 4 by 4 on the right
and left sides while being symmetrical about a second plane P2
which is orthogonal to the first plane P1 and includes the center
axis of the center plunger pump 12. Namely, the bolts 28 are
arranged symmetrically about the second plane P2. In other words,
the screw holes 32 and the bolts 28 are arranged rotationally
symmetrically with an order of 2. Thus arranging the screw holes 32
above makes it possible to attach the manifold 26 in a vertically
reversed state to the crankcase 16.
[0030] The bolts 22a to 22d for attaching the bearing case 20 to
the open end part of the crankcase 16 are passed through their
corresponding through holes 34a to 34d formed in the bearing case
20, so as to engage screw holes 36a to 36d provided in the open end
part of the crankcase 16. There are a plurality of (6 in this
embodiment) screw holes 36a to 36d, which are arranged
symmetrically about the above-mentioned first plane P1. Namely, the
bolts 22a to 22d are arranged symmetrically about the first plane
P1. The screw holes 36a to 36d are also arranged symmetrically
about a third plane P3 which is orthogonal to the first plane P1
and includes the axis of rotation of the crankshaft 14. Namely, the
bolts 22a to 22d are arranged symmetrically about the third plane
P3. In the depicted embodiment, the screw holes 36a to 36d and also
the bolts 22a to 22d are equally distanced from the axis of
rotation of the crankshaft 14 and are provided at intervals of
90.degree. about the axis of rotation.
[0031] As shown in FIG. 2, the closed end part 18 of the crankcase
16 is provided with two screw holes 38. These screw holes 38 are
symmetrical about the third plane P3 and about the axis of rotation
of the crankshaft 14. The screw holes 38 are used when attaching an
adaptor 40 which will be explained in the following.
[0032] When the above-mentioned reciprocating pump apparatus 10 of
driving source direct connection type 10 is used as a stationary
type, the crankcase 16 having the bell form is hard to place
directly onto a support such as apparatus frame. Hence, the adaptor
40 is employed. This adaptor 40 is a sheet made of a highly rigid
material such as metal, and is constituted by a lower part 42 and
first and second side parts 44, 46 rising from respective ends of
the lower part 42. The gap between the first and second side parts
44, 46 is substantially equal to the distance from the outer face
of the closed end part 18 of the crankcase 16 to the outer face of
the bearing case 20, so that the crankcase 16 and bearing case 20
can be placed between the first and second side parts 44, 46 as
shown in (a) to (c) of FIG. 3. Two through holes 48a, 48b are
formed in the upper portion of the first side part 44. These
through holes 48a, 48b are formed with the same pitch as with the
lower or upper two through holes 34a, 34b; 34c, 34d in the bearing
case 20 and the lower or upper two screw holes 36a, 36b; 36c, 36d
in the crankcase 16. Two through holes 50 are formed in the upper
portion of the second side part 46 with the same pitch as with the
two screw holes 38 formed in the closed end part 18 of the
crankcase 16.
[0033] When attaching the adaptor 40 to the reciprocating pump
apparatus 10 in the mode shown in (a) to (c) of FIG. 3, the lower
two bolts 22a, 22b securing the bearing case 20 are removed at
first. Then, the crankcase 16 and bearing case 20 are held between
the first and second side parts 44, 46 of the adapter 40, the
through holes 48a, 48b are aligned with the through holes 34a, 34b
and screw holes 36a, 36b, and the through holes 50 are aligned with
the screw holes 38. Finally, the bolts 22a, 22b, 52 are passed
through the through holes 48a, 48b, 50 of the first and second side
parts 44, 46, so as to engage the screw holes 36a, 36b, 38 of the
crankcase 16. When fastened with the bolts 22a, 22b, 52, the
adaptor 40 and bearing case 20 can simultaneously be fixed to the
crankcase 16. Since the screw holes 36a, 36b for securing the
bearing case 20 are utilized for attaching the adaptor 40, it is
unnecessary to provide a boss as in the reciprocating pump
apparatus disclosed in the above-mentioned Patent Document 1 or
turn the crankcase 16 and the bearing case 20 into other special
forms. Therefore, simple molds are sufficient for manufacturing the
crankcase 16 and bearing case 20, which can reduce the labor and
cost of manufacture. This also contributes to reducing the weight
of the reciprocating pump apparatus 10, since there are no extra
bosses and the like.
[0034] When the adaptor 40 is attached, the lower part 42 of the
adaptor 40 is substantially parallel to the axis of rotation of the
crankshaft 14 and the center axes of the plunger pumps 12 as shown
in (a) to (c) of FIG. 3. When the adaptor 40 is fixed to the
support 58 such as apparatus frame with bolts/nuts 56 utilizing
through holes 54 formed in the lower part 42, the reciprocating
apparatus 10 can be secured to the support 58. In this state, a
driving force from a driving source fixed to the support 58 or the
like is transmitted to the crankshaft through an appropriate
transmission mechanism such as belt transmission mechanism.
[0035] A depression 60 is formed at the center part in the upper
edge of the second side part 46 of the adaptor 40, so that a
projection 62 at the center of the closed end part 18 in the
crankcase 16 fits into the depression 60. Therefore, when the first
side part 44 of the adaptor 40 is bolted, the second side part 46
is supported by the projection 62. Hence, though the second side
part 46 is not necessarily bolted, the bolts 52 are preferably used
for securing the adaptor 40 more reliably.
[0036] In FIG. 4,(a) to (c) are views showing another mode of
attaching the adaptor 40. Here, the bolts 22c, 22d on the upper
side in (a) to (c) of FIG. 3 are removed, and the first side part
44 of the adaptor 40 is attached there. When fixed to the support
58, the reciprocating pump apparatus 10 in this case is vertically
reversed from the attached state of FIG. 3. Since the crankshaft 14
projects only one end thereof in this embodiment, the reciprocating
pump apparatus 10 is easily applicable to various driving source
positions if it can be fixed to the support 58 in a vertically
reversed fashion, whereby the degree of freedom in the layout of
the reciprocating pump apparatus 10 also increases.
[0037] In the state shown in (a) to (c) of FIG. 4, a discharge port
64 of the manifold 26 is located on the lower side. Though a lid 66
for taking out the valve on the discharge port 64 side faces down
and thus narrows the clearance from the support 58 in this state,
this embodiment can vertically reverse the manifold 26 as mentioned
above, so that the lid 66 can face up as well. Similarly, the
manifold 26 can vertically be reversed in the state shown in (a) to
(c) of FIG. 3 such that the lid 66 faces down. Namely, the
reciprocating pump apparatus 10 in accordance with this embodiment
can be fixed to the support 58 in four modes, which further
improves the degree of freedom in the layout.
[0038] Though a preferred embodiment of the present invention is
explained in detail in the foregoing, the present invention is not
limited to the above-mentioned embodiment as a matter of
course.
[0039] For example, the reciprocating pumps may be piston pumps,
and are not required to be of a multiple type. Also, the number of
screw holes is not limited to those of the above-mentioned
embodiment. Further, the bolts 22a, 22d, which are located on the
lower and upper sides in (a) and (b) of FIG. 3, may be utilized for
securing the adaptor 40, so that the adaptor 40 is erected with the
manifold 26 facing up. Furthermore, the form of the adaptor can be
changed in various ways.
* * * * *