CN104595165A - Diaphragm pump for liquid supply - Google Patents
Diaphragm pump for liquid supply Download PDFInfo
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- CN104595165A CN104595165A CN201510047483.5A CN201510047483A CN104595165A CN 104595165 A CN104595165 A CN 104595165A CN 201510047483 A CN201510047483 A CN 201510047483A CN 104595165 A CN104595165 A CN 104595165A
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- diaphragm
- backing plate
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- membrane surface
- liquid supply
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Abstract
The invention discloses a diaphragm pump for liquid supply. The diaphragm pump comprises a pump body, a motor, a crank connecting rod mechanism, a plunger piston, a hydraulic cylinder, a diaphragm, a suction value and a discharge valve, wherein the crank connecting rod mechanism is driven by the motor, an operation chamber and a hydraulic chamber are respectively arranged at two sides of the diaphragm, the two sides of the diaphragm are respectively clamped by a high-rigidity circular-disc-shaped pad plate, the circle center of each of the circular-disc-shaped pad plates arranged at two sides is correspondingly arranged in the circle center of the diaphragm, and in addition, a connecting rod is connected with the circular-disc-shaped pad plate arranged at one side of the hydraulic chamber of the diaphragm. The diaphragm pump has the advantages that the two sides of the diaphragm are respectively clamped by the high-rigidity circular-disc-shaped pad plates, great force does not need to be exerted on the diaphragm, the diaphragm cannot generate excessive deformation, and high discharging pressure can also be obtained, so the thickness of the diaphragm can be reduced, the driving force can be finally reduced, and in addition, the service life of the diaphragm is prolonged.
Description
Technical field
The invention belongs to field of mechanical technique, be specifically related to a kind of diaphragm pump.
Background technique
Urea for vehicle diaphragm pump is small-sized machine structure, can realize high pressure, and one of purposes of diaphragm pump is mapped in outlet pipe by the injection of reducing agent such as urea, light oil, then utilizes the reducing agent be arranged in air-flow to carry out catalytic reduction reaction.
Diaphragm pump makes diaphragm to-and-fro motion to change the volume of pump chamber, the inhalation solution when expanding volume, is discharged during smaller volume to solution pressurization.Usual diaphragm adopts thin rubber material to make, and can easily be concatenated to form concavity and convex by means of to-and-fro motion.Utilize to-and-fro motion to become convex from concavity, pressurize, when discharging liquid, during head pressure height, pressure makes rubber deformation, can discharge with higher pressure.
Jet pressure is higher, the liquid of injection and the mixed effect of gas better, therefore high pressure is better.Diaphragm pump external form is little, becomes more readily available high pressure, to be applicable to such use.But along with the formation of high pressure, the rubber of diaphragm should possess certain degree of hardness.
First, discharge from the compression of pump the action that operation sequentially illustrates diaphragm pump.Diaphragm starts mobile, slowly reduces the volume of pump chamber after completing the suction of solution, and the pressure in pump chamber also starts to rise.Therewith roughly simultaneously, the pressure increase in pump chamber, utilizes this pressure, and by the closure of check ring of solution suction side, the pressure of pump chamber is higher, and its tightness is higher.Diaphragm is by means of crank movement further, and the side reduced to making pump chamber volume is moved, and improves pump chamber pressure further simultaneously.Diaphragm is movement further, this room smaller volume, pressure increase, and when its pressure is reached more than the pressure of discharge side, discharge side safety check is opened, and with the further movement of diaphragm, the liquid of pump chamber is discharged.In this operation, along with the rising of pump chamber pressure, rubber diaphragm deforms by the pressure of pump chamber.After diaphragm is out of shape due to pressure, when the pressure of pump chamber does not rise further, it is exactly the boundary of the head pressure of this diaphragm pump.In order to reduce this distortion, be necessary the thickness etc. increasing its rubber, improve rigidity, but the rigidity of rubber is once improve, the power that the to-and-fro motion of diaphragm needs improves greatly, with small-sized and function that is that can realize the diaphragm pump that high head pressure is feature reduces greatly.
Therefore, need to design a kind of supplementary structure to improve the rigidity of diaphragm, and the pliability of himself can be guaranteed.
Summary of the invention
Technical problem to be solved by this invention is to provide and a kind ofly can produces high pressure and have the liquid supply diaphragm pump of increased durability.
A kind of liquid supply diaphragm pump, it comprises connecting rod, plunger, fluid cylinder, barrier film, suction valve and expulsion valve under the pump housing, motor, motor driving, diaphragm both sides are respectively operating room and hydraulic chamber, it is characterized in that, described diaphragm both sides are clamped with the discoid backing plate of high rigidity respectively, the corresponding center of circle being located at described barrier film respectively, the center of circle of the discoid backing plate of described both sides, and connecting rod is connected with the discoid backing plate being arranged on diaphragm hydraulic chamber side.
In of the present invention one preferred technological scheme, the discoid backing plate of diaphragm both sides has nearly membrane surface respectively, each nearly membrane surface described is respectively a curved surface, and when diaphragm is positioned at the neutral position at the upper and lower dead point of pumping action, the middle body of each nearly membrane surface of the discoid backing plate of both sides contacts with diaphragm, each nearly membrane surface more extends to its periphery from described middle body, each nearly membrane surface of both sides and the gap of diaphragm larger.
In of the present invention one preferred technological scheme, the curved surface being arranged at the nearly membrane surface of the discoid backing plate of described hydraulic chamber side be along with diaphragm move from lower dead centre to compression stroke time, contact the outer peripheral portion of nearly membrane surface curved surface from the middle body cooperation slowly of diaphragm.
In of the present invention one preferred technological scheme, the curved surface being arranged at the nearly membrane surface of the discoid backing plate of described operating room side be along with diaphragm move from upper dead center to suction stroke time, contact the outer peripheral portion of nearly membrane surface curved surface from the middle body cooperation slowly of diaphragm.
In of the present invention one preferred technological scheme, the discoid backing plate of diaphragm both sides has nearly membrane surface respectively, each nearly membrane surface described is respectively a cambered surface, and when diaphragm is positioned at the neutral position at the upper and lower dead point of pumping action, the middle body of each nearly membrane surface of the discoid backing plate of both sides contacts with diaphragm is tangent.
In of the present invention one preferred technological scheme, the external diameter of the discoid backing plate of operating room side is less than the external diameter of the discoid backing plate of hydraulic chamber side.
In of the present invention one preferred technological scheme, described diaphragm is selected from: the one in nitrile butadiene rubber, neoprene, fluorine rubber, teflon, poly-four or six ethene prepares.Certainly the barrier film that well known to a person skilled in the art that other technological means obtains can also be adopted.
Of the present invention one preferred technological scheme, the backing plate of described both sides is formed by the preparation of metals of high rigidity.
The effect of liquid supply diaphragm pump of the present invention: (1) clamps due to the discoid backing plate of the present invention in diaphragm both sides respectively by high rigidity, excessive power need not be applied to diaphragm, namely can not there is excessive deformation in barrier film, also high head pressure can be obtained, therefore the thickness of diaphragm can be reduced, finally can reduce driving force, and extend the working life of barrier film.
(2) and in the preferred technical solution of the present invention, the shape of the curved surface of the nearly membrane surface of discoid backing plate can coordinate the deformation of diaphragm when suction stroke terminal (lower dead centre) or compression stroke terminal (upper dead center), thus there is larger support barrier film deformation structure, larger stress can be provided.
(3) the invention provides the discoid backing plate of the high rigidity of the elastic diaphragm being suitable for diaphragm pump, diaphragm pump can provide larger pressure discharge liquid and delayed the aging of barrier film, adds working life.
Accompanying drawing explanation
Fig. 1 is the structural representation of the discoid backing plate of the barrier film of diaphragm pump of the present invention and the high rigidity of both sides auxiliary support thereof.
Fig. 2 be diaphragm pump when the lower dead point position of suction stroke terminal, the discoid pad tabular body schematic diagram of barrier film and both sides thereof.
Fig. 3 be diaphragm pump when compression stroke terminal upper dead center position, the discoid pad tabular body schematic diagram of barrier film and both sides thereof.
Wherein 1 is barrier film, and 2 is (operating room side) backing plate, and 3 is (hydraulic chamber side) backing plate, 4 is operating room, 5 is hydraulic chamber, and 6 is connecting rod, and 7 is (liquid) exhaust port, 8 is (liquid) suction port, 21 is (backing plate of operating room side) nearly membrane surface, and 211 is middle body, and 31 is (backing plate of hydraulic chamber side) nearly membrane surface, 311 is middle body, and 111 is the middle body of barrier film.
Embodiment
Below in conjunction with specific embodiment, such scheme is described further.Should be understood that these embodiments are not used in for illustration of the present invention to limit the scope of the invention.The implementation condition adopted in embodiment can do further adjustment according to the condition of concrete producer, and not marked implementation condition is generally the condition in normal experiment.
A kind of liquid supply diaphragm pump as shown in Figure 1, it comprises the pump housing, motor, crank mechanism under motor drives, plunger, fluid cylinder, barrier film, connect the connecting rod of bent axle and diaphragm, suction valve and expulsion valve, diaphragm 1 both sides are respectively operating room 4 and hydraulic chamber 5, diaphragm 1 both sides are respectively with the discoid backing plate 2 of high rigidity, 3 clamp, and the discoid backing plate 2 of both sides, the corresponding center of circle being located at described barrier film 1 respectively, the center of circle of 3, in the present embodiment, the discoid backing plate 2 of diaphragm 1 both sides, 3 have nearly membrane surface 21 respectively, 31, and this nearly membrane surface 21, 31 are respectively a curved surface, when diaphragm 1 is positioned on pumping action, during the neutral position of lower dead centre, the discoid backing plate 2 of both sides, the respective nearly membrane surface 21 of 3, the middle body 211 of 31, 311 contact with diaphragm 1 respectively, the nearly membrane surface of discoid backing plate is from the more outside Zhou Yanzhan of middle body, the nearly membrane surface 21 of both sides, 31 is larger with the gap of diaphragm 1.
A preferred embodiment of the present invention, the curved surface of the nearly membrane surface 21 of the discoid backing plate 2 of described operating room 4 side, be along with diaphragm 1 move from upper dead center to suction stroke time, from the outer peripheral portion of diaphragm middle body 111 cooperation contact surface slowly.
A preferred embodiment of the present invention, the curved surface being arranged at the nearly membrane surface 31 of the discoid backing plate 3 of hydraulic chamber 5 side be along with diaphragm 1 move from lower dead centre to compression stroke time, from the outer peripheral portion of diaphragm 1 middle body 111 cooperation contact surface slowly.
A preferred embodiment of the present invention, the external diameter of the discoid backing plate 2 of operating room 4 side is less than the external diameter of the discoid backing plate 3 of hydraulic chamber 5 side.
Connecting rod 6 one end connects barrier film and discoid backing plate 2,3, and the other end connecting crank, utilizes rotary motion to move up and down and pass to diaphragm 1.Crank is then rotated by means of motor etc.
Lower dead point position in Fig. 2 is the position that diaphragm 1 sucks liquid suction stroke terminal and terminates, because connecting rod 6 acts on the lower side that diaphragm 1 is positioned at hydraulic chamber 5.In this position, diaphragm 1 contacts hardly with the backing plate of hydraulic chamber 5 side, and liquid outlet 7 utilizes the pressure of high-pressure system to close butterfly valve.The curved surface of the nearly membrane surface 21 of the discoid backing plate 2 of operating room 4 side and diaphragm 1 comprehensive engagement, can bear excessive deformation, the stress of rubber diaphragm by means of backing plate.
Upper dead center position in Fig. 3 is the position that diaphragm 1 extrudes liquid compression stroke terminal and terminates, because connecting rod 6 acts on the top side that diaphragm 1 is positioned at hydraulic chamber 5.In this position, diaphragm 1 contacts hardly with the backing plate of operating room 4 side, and fluid intake 8 is opened.The curved surface of the nearly membrane surface 31 of the discoid backing plate 3 of hydraulic chamber 5 side and diaphragm 1 comprehensive engagement, can bear excessive deformation, the stress of rubber diaphragm by means of backing plate.
And as the above-mentioned movement that the support of backing plate can be made to coordinate diaphragm, from center, outside perimembranous expansion is come, and utilizes the elasticity of rubber and don't large elongation locally occurs.That is, when backing plate is plane, diaphragm is almost flat in the central authorities of concavo-convex motion, backing plate and diaphragm comprehensive engagement at that time, in discharge operation thereafter, only have the circumferential part branch not obtaining the ring-type of the support of backing plate in diaphragm that resiliently deformable occurs, diaphragm local excessive stretches.
Working principle and the process of liquid supply diaphragm pump of the present invention are:
Diaphragm 1 starts mobile after completing the suction of solution, crank rotates, and by means of connecting rod 6, diaphragm 1 rises, and starts to compress operating room 4, slowly makes the volume of pump chamber reduce, and the pressure in pump chamber also starts to rise.While the pressure increase in operating room 4 pump chamber, the safety check of solution suction side cuts out under this pressure effect, and operating room 4 pressure is higher, and its tightness is higher.Diaphragm 1 is by means of crank movement further, and the side reduced to making pump chamber volume is moved, and improves this pump chamber pressure simultaneously.
Along with the raising of pump chamber pressure, diaphragm slowly will deform by the pressure of pump chamber, but first the backing plate 3 being arranged at hydraulic chamber 5 side supports to the middle body 111 of diaphragm 1.
Connecting rod 6 still rises further, by the solution compresses of operating room 4.When the pressure of operating room 4 is identical with the pressure of high-pressure system, the butterfly valve that both are separated is opened, the solution of operating room 4 is discharged from exhaust port.This process be along with connecting rod from lower dead centre to intermediate point, upper dead center moves, diaphragm 1, due to the pressure of operating room 4, bears very large power, deform.At this moment, the nearly membrane surface 31 of the backing plate 3 of hydraulic chamber 5 side is slowly in contact with it from the middle body 111 of diaphragm 1, at first be the middle body 311 of the nearly membrane surface 31 of backing plate 3, make barrier film 1 can bear above-mentioned compressive force, the power excessive to barrier film 1 can not be there is, the solution compresses of operating room 4 can be made when there is not unnecessary deformation and excessive stress, discharging high-pressure solution from solution from exhaust port 7.
Along with diaphragm 1 moves to compressed side further, the support of backing plate 3 pairs of diaphragms 1 is slowly to peripheral part expansion, and at the end of the compression procedure of discharging step is final, the curved surface of the whole near membrane surface 31 of backing plate 3 supports diaphragm 1.Like this, due to the backing plate adopting the metal of high rigidity etc. to form, even pump also can work when high pressure.
Similarly, after diaphragm 1 completes the discharge of solution, when starting to enter suction stroke, crank rotates, and by means of connecting rod 6, diaphragm 1 declines, and start to deviate from operating room 4 direction and move, slowly make the volume of pump chamber increase, the pressure in pump chamber also reduces.While the pressure drop in operating room 4 pump chamber, the safety check of solution discharge side cuts out under this pressure effect, and operating room 4 pressure is higher, and its tightness is higher.
Along with connecting rod 6 is still descending further, diaphragm slowly will deform by connecting rod pulling force, and first the backing plate 2 being arranged at operating room 4 side supports to the middle body 111 of diaphragm 1.
Connecting rod 6 still declines further, by the pressure drop of operating room 4.When the pressure of operating room 4 is corresponding to pressure system, 8 is that the valve of (liquid) suction port is opened, and solution sucks from entrance.This process along with connecting rod from upper dead center to intermediate point, lower dead centre moves, diaphragm 1, owing to receiving solution pressure and the connecting rod pulling force of operating room 4, bears larger power, deform.At this moment, the nearly membrane surface 21 of the backing plate 2 of operating room 4 side is slowly in contact with it from the middle body 111 of diaphragm 1, at first be the middle body 211 of the nearly membrane surface 21 of backing plate 2, make barrier film 1 can bear above-mentioned compressive force, the power excessive to barrier film 1 can not be there is, the solution of operating room 4 can be made to flow into when there is not unnecessary deformation and excessive stress, along with diaphragm 1 moves to lower dead point position further, the support of backing plate 2 pairs of diaphragms 1 is slowly expanded to peripheral part, at the end of the compression procedure of discharging step is final, the curved surface of the whole near membrane surface 21 of backing plate 2 supports diaphragm 1.
In a preferred embodiment of the present invention, the liquid supply crank mechanism of diaphragm pump connects a connecting rod, and this connecting rod is connected with the discoid backing plate being arranged on diaphragm hydraulic chamber side.
In a preferred embodiment of the present invention, described diaphragm is selected from: the one in nitrile butadiene rubber, neoprene, fluorine rubber, teflon, poly-four or six ethene prepares.Certainly the barrier film that well known to a person skilled in the art that other technological means obtains can also be adopted.
Above-mentioned example, only for technical conceive of the present invention and feature are described, its object is to person skilled in the art can be understood content of the present invention and implement according to this, can not limit the scope of the invention with this.All equivalent transformations of doing according to Spirit Essence of the present invention or modification, all should be encompassed within protection scope of the present invention.
Claims (8)
1. a liquid supply diaphragm pump, it comprises connecting rod, plunger, fluid cylinder, barrier film, suction valve and expulsion valve under the pump housing, motor, motor driving, diaphragm both sides are respectively operating room and hydraulic chamber, it is characterized in that, described diaphragm both sides are clamped with the discoid backing plate of high rigidity respectively, the corresponding center of circle being located at described barrier film respectively, the center of circle of the discoid backing plate of described both sides, and connecting rod is connected with the discoid backing plate being arranged on diaphragm hydraulic chamber side.
2. liquid supply diaphragm pump according to claim 1, it is characterized in that, the discoid backing plate of diaphragm both sides has nearly membrane surface respectively, each nearly membrane surface described is respectively a curved surface, and when diaphragm is positioned at the neutral position at the upper and lower dead point of pumping action, the middle body of each nearly membrane surface of the discoid backing plate of both sides contacts with diaphragm, and each nearly membrane surface of both sides more extends to its periphery from its middle body, each nearly membrane surface of both sides and the gap of diaphragm larger.
3. liquid supply diaphragm pump according to claim 2, it is characterized in that, the curved surface being arranged at the nearly membrane surface of the discoid backing plate of described hydraulic chamber side be along with diaphragm move from lower dead centre to compression stroke time, contact the outer peripheral portion of nearly membrane surface curved surface from the middle body cooperation slowly of diaphragm.
4. liquid supply diaphragm pump according to claim 2, it is characterized in that, the curved surface being arranged at the nearly membrane surface of the discoid backing plate of described operating room side be along with diaphragm move from upper dead center to suction stroke time, contact the outer peripheral portion of nearly membrane surface curved surface from the middle body cooperation slowly of diaphragm.
5. liquid supply diaphragm pump according to claim 1, it is characterized in that, the discoid backing plate of diaphragm both sides has nearly membrane surface respectively, each nearly membrane surface described is respectively a cambered surface, and when diaphragm is positioned at the neutral position at the upper and lower dead point of pumping action, the middle body of each nearly membrane surface of the discoid backing plate of both sides contacts with diaphragm is tangent.
6. the liquid supply diaphragm pump according to any one of claim 1-5, is characterized in that, the external diameter of the discoid backing plate of operating room side is less than the external diameter of the discoid backing plate of hydraulic chamber side.
7. liquid supply diaphragm pump according to claim 1, it is characterized in that, described diaphragm is selected from: the one in nitrile butadiene rubber, neoprene, fluorine rubber, teflon, poly-four or six ethene prepares.
8. liquid supply diaphragm pump according to claim 1, is characterized in that, the backing plate of described both sides is formed by the preparation of metals of high rigidity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510047483.5A CN104595165A (en) | 2015-01-30 | 2015-01-30 | Diaphragm pump for liquid supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510047483.5A CN104595165A (en) | 2015-01-30 | 2015-01-30 | Diaphragm pump for liquid supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104595165A true CN104595165A (en) | 2015-05-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510047483.5A Pending CN104595165A (en) | 2015-01-30 | 2015-01-30 | Diaphragm pump for liquid supply |
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| Country | Link |
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| CN (1) | CN104595165A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106224213A (en) * | 2016-09-30 | 2016-12-14 | 罗凯缤 | A kind of exhaust gas from diesel vehicle post processing SCR system adds blue pump diaphragm sheet and seals structure |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000170660A (en) * | 1998-12-03 | 2000-06-20 | Fujikura Rubber Ltd | Magnetic diaphragm pump |
| CN1621716A (en) * | 2003-11-28 | 2005-06-01 | 株式会社丰田自动织机 | Diaphragm pump |
| CN1704587A (en) * | 2004-06-01 | 2005-12-07 | 株式会社丰田自动织机 | Diaphragm pump |
| JP2008150959A (en) * | 2006-12-14 | 2008-07-03 | Techno Takatsuki Co Ltd | Central holding assembly of diaphragm |
| CN204458279U (en) * | 2015-01-30 | 2015-07-08 | 清华大学苏州汽车研究院（吴江） | Liquid supply diaphragm pump |
-
2015
- 2015-01-30 CN CN201510047483.5A patent/CN104595165A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000170660A (en) * | 1998-12-03 | 2000-06-20 | Fujikura Rubber Ltd | Magnetic diaphragm pump |
| CN1621716A (en) * | 2003-11-28 | 2005-06-01 | 株式会社丰田自动织机 | Diaphragm pump |
| CN1704587A (en) * | 2004-06-01 | 2005-12-07 | 株式会社丰田自动织机 | Diaphragm pump |
| JP2008150959A (en) * | 2006-12-14 | 2008-07-03 | Techno Takatsuki Co Ltd | Central holding assembly of diaphragm |
| CN204458279U (en) * | 2015-01-30 | 2015-07-08 | 清华大学苏州汽车研究院（吴江） | Liquid supply diaphragm pump |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106224213A (en) * | 2016-09-30 | 2016-12-14 | 罗凯缤 | A kind of exhaust gas from diesel vehicle post processing SCR system adds blue pump diaphragm sheet and seals structure |
| CN106224213B (en) * | 2016-09-30 | 2018-11-13 | 罗凯缤 | A kind of exhaust gas from diesel vehicle post-processing SCR system adds blue pump diaphragm piece and sealing structure |
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Application publication date: 20150506 |