U.S. patent application number 15/782838 was filed with the patent office on 2019-04-18 for pulse-coupled pump.
This patent application is currently assigned to Zhejiang FAI Electronics Co., Ltd.. The applicant listed for this patent is Zhejiang FAI Electronics Co., Ltd.. Invention is credited to Qijiang LE, Daguang XI, Luming XU, Yanxiang YANG.
Application Number | 20190112959 15/782838 |
Document ID | / |
Family ID | 66096346 |
Filed Date | 2019-04-18 |
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United States Patent
Application |
20190112959 |
Kind Code |
A1 |
XI; Daguang ; et
al. |
April 18, 2019 |
PULSE-COUPLED PUMP
Abstract
A pulse-coupled pump includes a pump body, a low-pressure pump,
a high-pressure pump, and a solenoid. The low-pressure pump
comprises an armature, an armature sleeve and a rectifying valve.
The high-pressure pump comprises a plunger, a sleeve, an inlet
valve and a delivery valve. The high-pressure pump is coupled with
the low-pressure pump through the armature. The armature, located
in the armature sleeve, performs a reciprocating motion driven by
magnetic field force of the solenoid, which drives the plunger pump
and a forms two-way pulsating liquid. The two-way pulsating liquid
can form a directional flow through a rectifying valve. The
armature and the armature sleeve are made of magnetically permeable
material. The armature sleeve has a non-magnetic gap. The front end
of the armature is located near the magnetic gap. The inlet valve
is located upstream of the directional liquid flow.
Inventors: |
XI; Daguang; (Hangzhou,
CN) ; XU; Luming; (Hangzhou, CN) ; LE;
Qijiang; (Hangzhou, CN) ; YANG; Yanxiang;
(Hangzhou, CN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Zhejiang FAI Electronics Co., Ltd. |
Hangzhou |
|
CN |
|
|
Assignee: |
Zhejiang FAI Electronics Co.,
Ltd.
Hangzhou
CN
|
Family ID: |
66096346 |
Appl. No.: |
15/782838 |
Filed: |
October 12, 2017 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
F01N 3/0253 20130101;
F04B 53/1005 20130101; F04B 11/0025 20130101; F04B 17/046 20130101;
F01N 3/2066 20130101; F04B 5/02 20130101; F02M 59/102 20130101;
F01N 3/035 20130101; F01N 2610/1433 20130101; F04B 23/06 20130101;
F01N 13/0097 20140603; F04B 17/04 20130101; F01N 3/2892 20130101;
F01N 2610/03 20130101 |
International
Class: |
F01N 3/20 20060101
F01N003/20; F01N 3/025 20060101 F01N003/025; F04B 53/10 20060101
F04B053/10; F04B 23/06 20060101 F04B023/06; F04B 17/04 20060101
F04B017/04; F04B 11/00 20060101 F04B011/00; F01N 3/28 20060101
F01N003/28 |
Claims
1. A pulse-coupled pump, comprising a pump body, in which a
low-pressure pump, a high-pressure pump, and a solenoid is
disposed, wherein the low-pressure pump comprises an armature, an
armature sleeve and a rectifying valve, wherein the high-pressure
pump comprises a plunger, a sleeve, an inlet valve and a delivery
valve, wherein the high-pressure pump is coupled with the
low-pressure pump through the armature, wherein the armature, which
is located in the armature sleeve, performs a reciprocating motion
driven by the magnetic field force of the solenoid, which drives
the working of a plunger pump to produce a two-way pulsating
liquid, wherein the two-way pulsating liquid can form a directional
flow through a rectifying valve, and wherein the inlet valve is
located upstream of the directional liquid flow.
2. The pulse-coupled pump according to claim 1, wherein the
rectifying valve is a one-way valve.
3. The pulse-coupled pump according to claim 2, wherein the
rectifying valve is a diaphragm valve.
4. The pulse-coupled pump according to claim 3, wherein the sleeve
is moved in synchronism with the armature, and the plunger is fixed
relative to the pump body.
5. The pulse-coupled pump according to claim 3, wherein the plunger
is moved in synchronism with the armature, and the sleeve is fixed
relative to the pump body.
6. The pulse-coupled pump according to claim 4, wherein it
comprises a rear limiter and a front limiter fixed relative to the
pump body, and the armature moves in a fixed way between the front
limiter and the rear limiter, to obtain fixed liquid output of
single pulse.
7. The pulse-coupled pump according to claim 5, wherein it
comprises a rear limiter and a front limiter fixed relative to the
pump body, and the armature moves in a fixed way between the front
limiter and the rear limiter, to obtain fixed liquid output of
single pulse.
8. The pulse-coupled pump according to claim 4, wherein it
comprises an external circulating passage located outside the pump
body, the external circulating passage is connected in parallel
with the low-pressure pump in the pump body to form a space for
liquid circulation flow.
9. The pulse-coupled pump according to claim 5, wherein it
comprises an external circulating passage located outside the pump
body, the external circulating passage is connected in parallel
with the low-pressure pump in the pump body to form a space for
liquid circulation flow.
10. The pulse-coupled pump according to claim 6, wherein it
comprises an external circulating passage located outside the pump
body, the external circulating passage is connected in parallel
with the low-pressure pump in the pump body to form a space for
liquid circulation flow.
11. The pulse-coupled pump according to claim 7, wherein it
comprises an external circulating passage located outside the pump
body, the external circulating passage is connected in parallel
with the low-pressure pump in the pump body to form a space for
liquid circulation flow.
12. The pulse-coupled pump according to claim 8, wherein it
comprises a gas-liquid separation chamber, and the gas-liquid
separation chamber is connected in series to the external
circulating passage.
13. The pulse-coupled pump according to claim 9, wherein it
comprises a gas-liquid separation chamber, and the gas-liquid
separation chamber is connected in series to the external
circulating passage.
14. The pulse-coupled pump according to claim 10, wherein it
comprises a gas-liquid separation chamber, and the gas-liquid
separation chamber is connected in series to the external
circulating passage.
15. The pulse-coupled pump according to claim 11, wherein it
comprises a gas-liquid separation chamber, and the gas-liquid
separation chamber is connected in series to the external
circulating passage.
16. The pulse-coupled pump according to claim 12, wherein it
comprises a liquid feed filter, and the gas-liquid separation
chamber is communicated with the clean space of the filter.
17. The pulse-coupled pump according to claim 13, wherein it
comprises a liquid feed filter, and the gas-liquid separation
chamber is communicated with the clean space of the filter.
18. The pulse-coupled pump according to claim 14, wherein it
comprises a liquid feed filter, and the gas-liquid separation
chamber is communicated with the clean space of the filter.
19. The pulse-coupled pump according to claim 15, wherein it
comprises a liquid feed filter, and the gas-liquid separation
chamber is communicated with the clean space of the filter.
Description
FIELD OF THE INVENTION
[0001] The present invention relates to a liquid metering
technique, particularly to a liquid injection metering technique of
engine, and more particularly to an engine fuel injection device,
engine exhaust gas purification nitric oxide selective catalytic
reduction (SCR) system and fuel injection regeneration system of
diesel engine tail gas particulate filtration (DPF).
BACKGROUND
[0002] Liquid metering technique is a basic technique for modern
industry, and its applications include engine fuel injection system
(including Gasoline Direct Injection (GDI) and Multi-point
Injection (MPI)), engine exhaust gas purification nitric oxide
selective catalytic reduction (SCR) urea aqueous solution injection
system, and injection regeneration system of diesel engine tail gas
particulate filtration (DPF), etc. These systems have high
requirements for the metering of liquid.
[0003] Taking the solenoid plunger pump as an example, the
quantitative delivery of working fluid is achieved by
solenoid-driven armature reciprocating motion; however, the two-way
pulse fluid waves of liquid in the pump formed by the armature
during the movement easily lead to gas retention, especially for
the volatile liquid, the residual bubbles will greatly affect the
metering precision, to reduce the actual injection volume or even
empty injection. Besides, due to the liquid backflow obstruction,
it is easy to cause heat accumulation, affecting the service life
of the solenoid pump device.
[0004] In order to solve the above problem, the gas discharge or
liquid reflow is generally achieved by adding an exhaust passage
having a larger circulation cross section in the reflow direction
or changing an exhaust passage structure (such as a tapered
passage). In this way, the pump volume and manufacturing cost are
increased to a certain extent; in addition, the instable liquid
injection volume caused by liquid fluctuations from the armature
movement may influence the metering precision.
SUMMARY
[0005] In order to solve the above problems, an object of the
present invention is to provide a metering injection device with a
simple structure and high metering precision and broad
applicability.
[0006] In order to achieve the above object, the present invention
adopts the following technical solution: a pulse-coupled pump in
accordance with one embodiment of the invention comprises a pump
body, and a low-pressure pump, a high-pressure pump and a solenoid
therein. The low-pressure pump includes an armature, an armature
sleeve and a rectifying valve. The high-pressure pump includes a
plunger, a sleeve, an inlet valve and a delivery valve. The
high-pressure pump is coupled with the low-pressure pump through
the armature, that is, the armature, located in the armature
sleeve, has a reciprocating motion driven by the magnetic field
force of solenoid, which on one hand drives the working of a
plunger pump, and on the other hand, forms two-way pulsating
liquid. The two-way pulsating liquid can form a directional flow
through a rectifying valve. The armature and the armature sleeve
are made of permeability magnetic materials. The armature sleeve is
embedded with a non-magnetic magnetic gap, and the front end of the
armature is located near the magnetic gap. The inlet valve is
located upstream of the directional liquid flow. When the inlet
valve is open, the liquid enters the high-pressure pump from the
low-pressure pump through the inlet valve and flows out from the
delivery valve. The liquid output flow is determined by the driving
force exerted by the solenoid.
[0007] The rectifying valve may be a one-way valve that is opened
by pressure, for example, a diaphragm valve. The rectifying valve
is located upstream of the directional fluid. During the armature
pressure feed stroke, the liquid pressure in the low-pressure pump
increases, the rectifying valve is opened, the liquid and bubbles
flow out; and during the armature return, the liquid pressure in
low-pressure pump drops, the rectifying valve is closed, to block
the fluid and form directional fluid.
[0008] For the above pulse-coupled pump, an alternative solution
is: The pulse-coupled pump is a plunger motion pump, the plunger is
connected to the armature in a synchronous motion way. The sleeve
is fixed relative to the pump body, to form a relative motion
between the sleeve and the plunger. Liquid enters the high-pressure
pump from the inlet valve and delivers from the delivery valve at a
high pressure.
[0009] For the above pulse-coupled pump, another alternative
solution is: the pulse-coupled pump is a sleeve motion pump, the
plunger is connected to the armature in a synchronous motion way,
or the sleeve and armature are designed as a whole. The plunger is
fixed relative to the pump body, to form a relative motion between
the sleeve and the plunger. Liquid enters the high-pressure pump
from the inlet valve and delivers from the delivery valve at a high
pressure.
[0010] Further, the pulse-coupled pump may be a constant volume
metering pump including an armature front limiter and an armature
rear limiter fixed to the pump body. The solenoid provides
sufficient electromagnetic force to reach the front limiter for the
armature. The armature has a reciprocating motion with fixed stroke
between the front limiter and the rear limiter; the output flow of
liquid is determined by the geometric size of electronic metering
pump, and the liquid output per unit time is changed by changing
the frequency of reciprocating motion of the armature.
[0011] The above pulse-coupled pump includes a liquid inlet
passage, an exhaust passage and an external circulation flow
passage. The outer circulation flow passage, located outside of the
pump body, is connected to the liquid inlet passage and the exhaust
passage respectively, so that the external circulation space is
connected to the low-pressure pump in the pump body in parallel to
form a space for liquid circulation flow.
[0012] Further, the above pulse-coupled pump includes a liquid feed
filter connected to a liquid inlet passage and a gas-liquid
separation chamber connected in series to the external circulation
flow passage. The gas-liquid separation chamber is in communication
with the clean space of the filter, so that the reflux liquid is
involved in the working cycle again, to reduce the burden of the
filter. The exhaust passage includes an exhaust passage which
extends the liquid reflux port upwardly, so that the pressure at
the outlet end is reduced and bubbles can be discharged
smoothly.
[0013] The invention will now be described in further detail with
reference to the accompanying drawings and specific
embodiments.
BRIEF DESCRIPTION OF THE DRAWINGS
[0014] FIG. 1 is a schematic diagram of a pulse-coupled pump
according to a first embodiment of the invention.
[0015] FIG. 2 is a schematic diagram of a pulse-coupled pump
according to a second embodiment of the invention.
[0016] FIG. 3 is a schematic diagram of a SCR application example
of a pulse-coupled pump in the invention.
[0017] FIG. 4 is a schematic diagram of a fuel injection
application example of a pulse-coupled pump in the invention.
DETAILED DESCRIPTION
[0018] FIG. 1 is a schematic diagram of a pulse-coupled pump
according to a first embodiment of the invention. The pulse-coupled
pump 1 includes a pump body la and a low-pressure pump 2, a
high-pressure pump 12, a solenoid 3, a reset spring 14, a liquid
inlet passage 6, an exhaust passage 20, and a liquid delivery
passage 9.
[0019] The low-pressure pump 2 includes an armature 17, an armature
sleeve 16 and a rectifying valve 21. The armature 16, located in
the armature sleeve 16, can move relative to the armature sleeve
16. The armature 17, located in the armature sleeve 16, has a
motion relative to the armature sleeve 16. The armature 17 and the
armature sleeve 16 are made of permeability magnetic materials. The
armature sleeve 16 is embedded with a non-magnetic magnetic gap 15,
and the front end of the armature 17 is located near the magnetic
gap 15. The rectifying valve 21 is a pressure-opened ball valve,
including a rectifying valve 18, a rectifying valve spring 19, a
rectifying valve seat 8. When the liquid pressure of the
low-pressure pump 2 is higher than the spring force of the
rectifying valve spring 19, the rectifying valve 21 is opened, and
the liquid and the gas produced are delivered to the exhaust
passage 20.
[0020] The high-pressure pump 12 includes a plunger 13, a sleeve 5,
an inlet valve 4 and a delivery valve 10. The plunger 13 is
connected to the armature 17 in a synchronous motion way. The
sleeve 5 includes a central sleeve hole 5b and a side-through hole
5a that connects to the sleeve hole 5b and the low-pressure pump 2.
The surface 13a of the plunger 13 is closely matched with the
sleeve hole 5b to slide relatively each other, to achieve liquid
delivery. The inlet valve 4 is a slide valve formed by the surface
13a of the plunger 13 and the side-through hole 5a. The delivery
valve 10 is a one-way ball valve which is opened by pressure and
includes a delivery valve 7, a delivery valve spring 8 and a
delivery valve seat 11. When the liquid pressure in the
high-pressure pump 12 is higher than the spring force of the
delivery valve spring 8, the delivery valve 10 is opened, and the
liquid enters the liquid delivery passage 9.
[0021] The reset spring 14 acts between the armature 17 and the
pump body la, with the action of the magnetic force of the solenoid
3 and the spring force of the reset spring 14, the armature 17 and
the plunger 13 reciprocate, to form two-way pulsating liquid in the
low-pressure pump 2. The two-way pulsating liquid forms a
directional flow through the rectifying valve 21; at the same time,
high pressure output of liquid is achieved in the high-pressure
pump 12.
[0022] The working process of the pulse-coupled pump is described
as follows.
[0023] Liquid enters to the low-pressure pump 2 from the liquid
inlet passage 6, then enters to the high-pressure pump 12 through
inlet valve 4, filled with the pump body. When the solenoid 3 is
energized, the armature 17 drives the plunger 13 into the pressure
stroke by the electromagnetic force, and the inlet valve 4 is
closed when the surface 13a of the plunger 13 completely shields
the side through hole 5a. The plunger 13 continues to move, and the
liquid pressure in the high-pressure pump 12 continues to rise.
When the pre-set opening pressure of the delivery valve 10 is
overcome, the delivery valve 10 is opened, and the high pressure
liquid is delivered through the liquid delivery passage 9. During
the process, with the movement of armature 17, the liquid pressure
in the low-pressure pump 2 is increased, the rectifying valve 21 is
opened, and the liquid and gas herein enter the exhaust passage 20
through the rectifying valve 21. When the solenoid 3 is powered
off, the armature 17 drives the plunger 13 to return under the
spring force of the reset spring 14, the liquid pressure in the
high-pressure pump 12 is decreased and the delivery valve 10 is
closed. The plunger 13 is opened when moving to the side through
hole 5a and the low-pressure pump 2 is connected with the sleeve
hole 5b again. Due to the differential pressure, the liquid is
rapidly fed into the high-pressure pump 12. During this process,
the liquid pressure in the low-pressure pump 2 is dropped and the
rectifying valve 21 is closed, to block the discharged bubbles and
prevent bubbles from entering the high-pressure pump 12.
[0024] The liquid output of the pulse-coupled pump 1 is determined
by the driving force exerted by the solenoid 3.
[0025] FIG. 2 shows a schematic diagram of a pulse-coupled pump
according to a second embodiment of the present invention. The
first difference between the structure of this embodiment and that
of the first embodiment is that: the pulse-coupled pump provided in
the invention is a sleeve mobile-type constant delivery pump, and
its liquid injection flow is determined by the geometric size of
metering pump. The pulse-coupled pump includes a rear limiter and a
front limiter, and the solenoid device provides the electromagnetic
force required for armature to reach the front limiter. The
armature is connected to the sleeve in a synchronized motion way,
the armature and sleeve reciprocate fixedly between the rear
limiter and the front limiter, resulting in a corresponding change
in the volume of the low-pressure pump and the high-pressure pump
and the discharge of bubbles and return liquid and liquid
injection. The second difference between the structure in the
embodiment and that of the first embodiment is that: the rectifying
valve is a diaphragm valve including a diaphragm valve body. Only
when the liquid pressure in the low-pressure pump is increased, the
diaphragm valve is opened, making the liquid and exhaust gas flow
directionally. The third difference between the structure in the
embodiment and that of the first embodiment is that: the inlet
valve is a pressure-operated ball valve, including an inlet valve
body, an inlet valve spring, an inlet valve seat and an inlet valve
limiter. The inlet valve limiter is fixed relative to the pump
body. During the release travel, before the armature reaches the
rear limiter, the movement of the inlet valve is stopped by the
inlet valve limiter, and the inlet valve remains open.
[0026] FIG. 3 shows a schematic diagram of an SCR application
example of a pulse-coupled pump provided in the present invention,
including a fluid reservoir, a pulse-coupled pump, a gas-liquid
mixing chamber, a compressed air source, an atomizing nozzle
mounted on an exhaust duct. The output space of the pulse-coupled
pump is communicated with a gas-liquid mixing chamber. The
compressed air source is communicated with the gas-liquid mixing
chamber via the intake passage.
[0027] A pulse-coupled pump of the invention may be a sleeve
mobile-type constant delivery pump, including an external
circulation flow passage and a gas-liquid separation chamber
connected in series to the circulation space. The external
circulation flow passage, located outside of the pump body, is
connected to the liquid inlet passage and the exhaust passage
respectively, so that the external circulation space is connected
in parallel with the low-pressure pump in the pump body to form a
space for the liquid circulation, and the clean liquid can be
recycled to reduce the burden of the filter. The pulse-coupled pump
is placed in the bottom of the fluid reservoir. The liquid in the
fluid reservoir, due to its dead weight, enters the low-pressure
pump from the liquid inlet passage and enters the high-pressure
pump from the inlet valve after passing through the filter.
[0028] The working process of the structure in this application
example is as follows.
[0029] A liquid in the reservoir tank enters the pulse-coupled pump
from the liquid inlet passage after flowing through the filter. The
armature is moved towards the front limiter together with the
sleeve by the electromagnetic force. When the liquid pressure in
the high-pressure pump is greater than the opening pressure of the
delivery valve, the delivery valve is opened, the liquid enters the
output space and is injected into the gas-liquid mixing chamber at
high pressure, which is mixed with the high-pressure air from the
compressed air supply and atomized into the exhaust pipe by
atomizing nozzle. During the process, the gas and return liquid
produced enter the circulation space through the rectifying valve,
which is separated in the gas-liquid separation chamber. The gas is
exhausted to the upper space of the reservoir tank through the
exhaust passage, while the liquid is flowed back to the liquid
inlet passage, to start the next injection.
[0030] FIG. 4 shows a schematic diagram of a fuel injection
application example of a pulse-coupled pump provided in the present
invention, including a fluid reservoir and a pulse-coupled pump.
The fluid reservoir includes an exhaust port at the top and a
liquid outlet located at the bottom. The exhaust passage is
connected to the exhaust port via the exhaust pipe. The liquid
inlet passage is connected to the liquid outlet of the fluid
reservoir by means of a liquid supply pipe. The liquid in the fluid
reservoir is filtered through the filter and flows from the liquid
outlet and the liquid supply pipe into the space where the liquid
inside the pulse pump can reach. For the return liquid or fuel
vapor produced during the working of pulse-coupled pump, after
separated by the circulating space, the liquid part flows back to
the liquid inlet passage, and the gas part enters the top of the
space inside the fluid reservoir through the exhaust passage, the
return pipe and the exhaust port.
[0031] A pulse-coupled pump of the invention may be a
solenoid-metering pump, and its injection flow is determined by the
driving force exerted by the solenoid. The pulse coupling portion
includes an external circulating space and a liquid feed filter
that connects to the fluid passage valve. The filter includes a
gas-liquid separation chamber and one external circulating space is
connected to the exhaust passage, and the other external
circulating space is introduced to the clean space of the
filter.
[0032] While embodiments of the invention have been illustrated
with a limited number of examples. One skilled in the art would
appreciate that other modifications and variations are possible.
Therefore, other technical solutions based on the essence of the
invention shall fall within the scope of the invention.
* * * * *