CN113279954B

CN113279954B - Hydraulic pump with long service life

Info

Publication number: CN113279954B
Application number: CN202110672410.0A
Authority: CN
Inventors: 陈道伟
Original assignee: Zhejiang Ligao Pump Technology Co ltd
Current assignee: Zhejiang Ligao Pump Technology Co ltd
Priority date: 2021-06-17
Filing date: 2021-06-17
Publication date: 2022-11-15
Anticipated expiration: 2041-06-17
Also published as: CN113279954A

Abstract

The invention belongs to the field of fluid machinery, and particularly relates to a hydraulic pump with long service life, which comprises a driving part, a transmission part and an overflowing part which are connected in a matching way, wherein the overflowing part comprises a pump head, a pump head base fixedly matched with the pump head, check valves respectively arranged on an inlet and an outlet of the pump head, and an exhaust valve and an oil supplementing valve which are arranged on the pump head base in a matching way, a cavity is formed between the pump head and the pump head base, and a diaphragm lining plate are arranged in the cavity. The invention improves the one-way valve, the exhaust valve, the oil supplementing valve and the diaphragm lining plate of the hydraulic pump correspondingly, and can improve the use effect and prolong the service life of the hydraulic pump.

Description

Hydraulic pump with long service life

Technical Field

The invention belongs to the field of fluid machinery, and particularly relates to a hydraulic pump with a long service life.

Background

The hydraulic pump is a power element of a hydraulic system, and is an element which is driven by an engine or an electric motor, sucks oil from a hydraulic oil tank, forms pressure oil, discharges the pressure oil and sends the pressure oil to an execution element. The plunger type metering pump is a kind of hydraulic pump, and is characterized in that a constant flow rate is maintained regardless of a discharge pressure. The metering pump can simultaneously complete the functions of conveying, metering and adjusting, thereby simplifying the production process flow. By using a plurality of metering pumps, several media can be input into the process flow in an accurate proportion for mixing. Due to its outstanding features, the metering pump is widely used in petrochemical industry, pharmacy, food and other industrial fields. The metering pump generally comprises a worm and gear driving mechanism, an eccentric swing mechanism, a plunger reciprocating mechanism and a diaphragm pump head mechanism, wherein the worm and gear driving mechanism drives the eccentric swing mechanism to move, an eccentric wheel of the eccentric swing mechanism drives a plunger in the plunger reciprocating mechanism to reciprocate, the plunger drives a diaphragm of the diaphragm pump head mechanism to deform, and the deformation of the diaphragm can change the volume of a pump cavity, so that the aim of conveying a medium is fulfilled.

Patent CN210343640U discloses a be used for high-pressure liquid CO2 to carry with measuring pump, drive division, transmission part and the part of overflowing that connects including the cooperation, overflow the part including the pump head, with pump head fixed connection's pump head base, the cooling chamber is seted up to the front end of pump head, and the front end fixed connection of pump head covers the pump head clamp plate in cooling chamber, forms a cavity between pump head and the pump head base, and this cavity sets gradually first diaphragm welt, first diaphragm, middle wafer, second diaphragm and second diaphragm welt from preceding backward, is covered with the through-hole on first diaphragm welt and the second diaphragm welt. This patent has set up the cooling chamber, can keep CO2 to be in the low temperature state, has two diaphragms, and the leakproofness is better, even if one of them damages also can use, has prolonged life.

The problems with the above metering pump are: 1) The valve seat in the check valve of the pump head is easily abraded by the impact of the valve ball, so that the service life is greatly reduced; 2) Although the exhaust valve in the traditional hydraulic pump can exhaust gas, the exhaust valve is easy to discharge oil, and the treatment of the oil is lacked; 3) An oil supplementing valve in a traditional hydraulic pump is complex in structure, poor in pressure resistance and easy to block, so that the service life of oil supplementing is short; 4) The counter bore of diaphragm welt is big among the traditional hydraulic pump to and counter bore quantity and setting are unreasonable, and in the use, when fluid medium passed through diaphragm welt counter bore, can make the reduction of the volumetric efficiency of pump, and to the hydraulic pump of low discharge, the reduction of volumetric efficiency, measurement accuracy will reduce, reduces work efficiency.

Disclosure of Invention

In order to make up for the defects of the prior art, the invention provides a technical scheme of a hydraulic pump with a long service life.

The hydraulic pump with the long service life comprises a driving part, a transmission part and an overflowing part which are connected in a matching mode, wherein the overflowing part comprises a pump head, a pump head base fixedly matched with the pump head, one-way valves respectively arranged on an inlet and an outlet of the pump head, an exhaust valve and an oil replenishing valve which are installed on the pump head base in a matching mode, a cavity is formed between the pump head and the pump head base, and a diaphragm lining plate are arranged in the cavity;

the exhaust valve comprises an exhaust valve shell assembly, an exhaust valve passage is arranged in the exhaust valve shell assembly, a first exhaust valve ball cavity and a second exhaust valve ball cavity are sequentially arranged in the exhaust valve passage from top to bottom, a first exhaust valve ball is arranged in the first exhaust valve ball cavity, a second exhaust valve ball is arranged in the second exhaust valve ball cavity, an exhaust valve spring used for tightly pushing the second exhaust valve ball downwards is further arranged between the second exhaust valve ball and the inner wall of the exhaust valve passage in a matched mode, an exhaust valve oil nozzle communicated with the exhaust valve passage is installed at the upper end of the exhaust valve shell assembly in a matched mode, and the exhaust valve oil nozzle is used for being connected with the oil sump in a matched mode;

the oil supplementing valve comprises an oil supplementing valve body, an oil supplementing valve rod, an oil supplementing valve spring and an oil supplementing valve nut, wherein the end face of the top of the oil supplementing valve body is a plane, an oil supplementing valve hole is vertically formed in the oil supplementing valve body, an inner chamfering valve port of the oil supplementing valve is formed in the top of the oil supplementing valve hole, an oil supplementing valve radial through hole communicated with the oil supplementing valve hole is horizontally formed in the upper end of the oil supplementing valve body, an inner hole shoulder of the oil supplementing valve is formed in the middle of the oil supplementing valve hole, the oil supplementing valve rod is slidably inserted and matched in the oil supplementing valve hole, an oil supplementing valve rod block forming a sealing pair with the inner chamfering valve port of the oil supplementing valve is arranged at the upper end of the oil supplementing valve rod, the oil supplementing valve spring is sleeved on the lower portion of the oil supplementing valve rod and used for pulling the oil supplementing valve rod downwards to enable the oil supplementing valve rod block to plug the inner chamfering valve port of the oil supplementing valve, and the oil supplementing valve nut is screwed to the bottom of the oil supplementing valve body;

the diaphragm liner plate is provided with liner plate flow guide holes for media to pass through, and the end face of the second liner plate of the diaphragm liner plate is provided with an arc-shaped concave surface for the movement of the diaphragm.

The hydraulic pump with the long service life is characterized in that the upper end of the one-way valve cover is provided with a third one-way valve annular step structure, the lower end of the one-way valve cover is provided with a first one-way valve annular step structure, the upper end and the lower end of the one-way valve seat are respectively provided with a second one-way valve annular step structure, the first one-way valve annular step structure of the upper one-way valve cover is buckled with the third one-way valve annular step structure of the lower one-way valve cover, and the first one-way valve annular step structure of the lower one-way valve cover is buckled with the second one-way valve annular step structure of the one-way valve seat.

The hydraulic pump with the long service life is characterized in that the one-way valve shell assembly further comprises a one-way valve connecting pipe cap and a one-way valve connecting pipe sleeve, the one-way valve connecting pipe cap is in threaded sleeve connection with the upper end of the one-way valve body, the lower end of the one-way valve connecting pipe sleeve is provided with a one-way valve boss structure, and the one-way valve boss structure is inserted into the one-way valve connecting pipe cap and clamped between the one-way valve body and the inner wall of the top of the one-way valve connecting pipe cap.

A hydraulic pump with high life, its characterized in that discharge valve casing subassembly includes discharge valve body, discharge valve bonnet and the discharge valve disk seat of gomphosis in proper order from top to bottom down, discharge valve body is used for the interface spiro union cooperation with pump head base to compress tightly discharge valve bonnet and discharge valve disk seat in pump head base's interface.

The hydraulic pump with the long service life is characterized in that the exhaust valve exhaust channel comprises an exhaust valve body channel arranged on the exhaust valve body, an exhaust valve cover channel arranged on the exhaust valve cover and an exhaust valve seat channel arranged on the exhaust valve seat, the first exhaust valve ball cavity is formed by the lower end of the exhaust valve body channel and the upper end of the exhaust valve cover channel, the second exhaust valve ball cavity is formed by the lower end of the exhaust valve cover channel and the upper end of the exhaust valve seat channel, and the exhaust valve spring is arranged in the exhaust valve cover channel; exhaust valve body passageway upper end spiro union exhaust valve joint screw of exhaust valve body, the exhaust valve glib talker presss from both sides and locates between the head of exhaust valve joint screw and the upper end of exhaust valve body, and exhaust valve joint screw has the exhaust valve joint screw passageway that communicates with exhaust valve body passageway and exhaust valve glib talker inner chamber respectively.

The hydraulic pump with long service life is characterized in that the top end face of the valve body of the oil replenishing valve is provided with a high-pressure resistant gasket of the oil replenishing valve.

The hydraulic pump with long service life is characterized in that the clearance between the hole wall of the inner hole shoulder of the oil replenishing valve and the valve rod of the oil replenishing valve is 0.35-0.65mm; the oil supplementing valve body is of an integrally formed structure.

The hydraulic pump with the long service life is characterized in that a lining plate groove is formed in the end face of a first lining plate of the membrane lining plate, and the lining plate flow guide hole is located in the lining plate groove.

The hydraulic pump with long service life is characterized in that the liner plate flow guide holes are uniformly distributed in an annular and radial manner.

The hydraulic pump with the long service life is characterized in that a cross groove for expanding the fluidity of a medium is further arranged on the end face of the first lining plate, and one end of the cross groove extends to the edge of the membrane lining plate.

Compared with the prior art, the invention has the beneficial effects that:

1) The check valve has the advantages that the check valve seat in the check valve is of an up-down symmetrical structure, and when the upper end of the check valve seat is impacted and abraded by the check valve ball, the upper end and the lower end of the check valve seat can be exchanged for use, so that the service life of the check valve seat can be prolonged, and the cost is reduced;

2) The exhaust valve adopts a double-plugging structure of the first exhaust valve ball and the second exhaust valve ball, so that the condition that oil is exhausted along with gas can be effectively reduced;

3) According to the exhaust valve, the oil which is discharged along with the gas is discharged into the oil pool by the oil nozzle of the exhaust valve, so that the oil is prevented from being exposed, and the installation angle of the oil nozzle of the exhaust valve can be adjusted, so that the exhaust valve can be conveniently butted with the oil pool;

4) The exhaust valve shell assembly of the exhaust valve is divided into an exhaust valve body, an exhaust valve cover and an exhaust valve seat, is manufactured in a split mode, is easier to process, and is installed in an embedded mode and is tighter;

5) The end surface of the top of the oil supplementing valve body in the oil supplementing valve is a plane, an inner chamfer valve port of the oil supplementing valve is easy to process, the sealing effect of the inner chamfer valve port of the oil supplementing valve is better, foreign matters are not easy to deposit on the plane, the blockage is not easy, the high pressure resistance is stronger, and the service life of the oil supplementing valve can be prolonged;

6) The high-pressure resistant gasket of the oil replenishing valve is arranged on the end face of the top of the valve body of the oil replenishing valve, so that the high-pressure resistance can be improved;

7) In the oil replenishing valve, a sufficient gap is reserved between the wall of the hole of the inner hole shoulder of the oil replenishing valve and the valve rod of the oil replenishing valve, so that the inner hole shoulder of the oil replenishing valve is not easy to block;

8) The oil supplementing valve body in the oil supplementing valve is of an integrally formed structure, so that the oil supplementing valve is easy to produce and manufacture and more convenient to assemble;

9) According to the diaphragm liner plate, the annular liner plate groove is formed in the end face of the first liner plate, and the liner plate guide holes are formed in the annular liner plate groove, so that a medium can pass through the liner plate guide holes more uniformly, the size of counter bores of the diaphragm liner plate can be reduced, the volume efficiency of the diaphragm hydraulic pump can be increased, and the working precision and the working efficiency can be improved.

Drawings

FIG. 1 is a schematic view of the present invention;

FIG. 2 is a second schematic structural diagram of the present invention;

FIG. 3 is a cross-sectional view taken along line D-D of FIG. 2;

FIG. 4 is a schematic cross-sectional view of a check valve of the present invention;

FIG. 5 is a schematic view of the structure of the exhaust valve of the present invention;

FIG. 6 is a cross-sectional view taken along line E-E of FIG. 5;

FIG. 7 is a schematic sectional view of the oil replenishment valve of the present invention;

FIG. 8 is a schematic view of the construction of the membrane liner of the present invention;

FIG. 9 is a schematic front view of the second liner end face of the diaphragm liner of the present invention;

fig. 10 is a perspective view of the second liner end face of the film liner of the present invention.

Detailed Description

In the description of the present invention, it is to be understood that the terms "one end", "the other end", "outside", "upper", "inside", "horizontal", "coaxial", "central", "end", "length", "outer end", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the present invention.

The invention will be further explained with reference to the drawings.

As shown in the figure, a hydraulic pump with long service life, drive division A, transmission part B and the part C that overflows that connects including the cooperation, overflow part C include pump head 1, with pump head 1 fixed coordination's pump head base 2, set up respectively in the import of pump head 1 and the check valve 3 and the cooperation on installing discharge valve 4 and the oil supplementing valve 5 on pump head base 2 on the export, form the cavity between pump head 1 and the pump head base 2, set up diaphragm 7 and diaphragm welt 6 in this cavity.

The check valve 3 comprises a check valve housing assembly and a check valve core assembly arranged in the check valve housing assembly, the check valve housing assembly comprises a check valve body 34, the check valve core assembly is accommodated in the check valve body 34, the check valve body 34 is used for being in threaded fit with an interface of a pump head and pressing the check valve core assembly onto the interface of the pump head, the check valve core assembly comprises a set of check valve bonnet 31 and a check valve seat 32 arranged at the lower end of the set of check valve bonnet 31, the check valve seat 32 is of an up-and-down symmetrical structure, and a check valve ball 33 is arranged in the check valve bonnet 31. The number of the two one-way valve covers 31 is two, the two one-way valve covers 31 are arranged up and down, the bottom of the one-way valve ball 33 in the upper one-way valve cover 31 is blocked by the lower one-way valve cover 31, and the bottom of the one-way valve ball 33 in the lower one-way valve cover 31 is blocked by the one-way valve seat 32.

Further, the upper end of the check valve bonnet 31 has a third check valve annular step structure 3101, the lower end of the check valve bonnet 31 has a first check valve annular step structure 3100, the upper and lower ends of the check valve seat 32 have second check valve annular step structures 3200, the first check valve annular step structure 3100 of the upper check valve bonnet 31 is fastened with the third check valve annular step structure 3101 of the lower check valve bonnet 31, and the first check valve annular step structure 3100 of the lower check valve bonnet 31 is fastened with the second check valve annular step structure 3200 of the check valve seat 32. The third annular step 3101 of the upper one-way valve cover 31 is engaged with the annular step on the inner wall of the top of the one-way valve body 34.

Further, the one-way valve housing assembly further comprises a one-way valve pipe connecting cap 35 and a one-way valve pipe connecting sleeve 36, the one-way valve pipe connecting cap 35 is in threaded sleeve connection with the upper end of the one-way valve body 34, the lower end of the one-way valve pipe connecting sleeve 36 is provided with a one-way valve boss structure 3600, and the one-way valve boss structure 3600 is inserted into the one-way valve pipe connecting cap 35 and clamped between the one-way valve body 34 and the inner wall of the top of the one-way valve pipe connecting cap 35. Wherein, the middle outer wall of the check valve body 34 has an outer hexagonal structure 3400.

When the check valve 3 is used, a check valve gasket 37 can be additionally arranged at the bottom of the check valve seat 32.

Because the check valve seat 32 in the present invention is in a vertically symmetrical structure, when the upper end of the check valve seat 32 is impacted and worn by the check valve ball 33, the upper end and the lower end of the check valve seat 32 can be exchanged for use, which is equivalent to doubling the service life of the check valve seat 32.

Discharge valve 4 includes discharge valve casing subassembly, set up discharge valve exhaust passage in the discharge valve casing subassembly, set gradually first discharge valve ball chamber 44 and second discharge valve ball chamber 45 from top to bottom in the discharge valve exhaust passage, set up first discharge valve ball 46 in first discharge valve ball chamber 44, first discharge valve ball 46 utilizes the dead weight to block up the end opening in first discharge valve ball chamber 44, set up second discharge valve ball 47 in second discharge valve ball chamber 45, still the cooperation sets up the discharge valve spring 48 who is used for pushing up tight second discharge valve ball 47 down between second discharge valve ball 47 and the discharge valve exhaust passage inner wall, discharge valve spring 48 makes second discharge valve ball 47 block up the end opening in second discharge valve ball chamber 45, discharge valve assembly's upper end cooperation installation and discharge valve exhaust passage intercommunication's glib 413, discharge valve glib 413 is used for being connected with the oil bath cooperation.

Further optimization of the exhaust valve 4: the exhaust valve casing assembly comprises an exhaust valve body 41, an exhaust valve cover 42 and an exhaust valve seat 43 which are sequentially embedded from top to bottom, wherein the exhaust valve body 41 is in threaded connection with the interface of the pump head base 2 to compress the exhaust valve cover 42 and the exhaust valve seat 43 in the interface of the pump head base.

Further, the exhaust valve bleed passage includes an exhaust valve body passage 4100 provided in exhaust valve body 41, an exhaust valve housing passage 4200 provided in exhaust valve housing 42, and an exhaust valve seat passage 4300 provided in exhaust valve seat 43, the first exhaust valve ball cavity 44 is formed by a lower end of exhaust valve body passage 4100 and an upper end of exhaust valve housing passage 4200, the second exhaust valve ball cavity 45 is formed by a lower end of exhaust valve housing passage 4200 and an upper end of exhaust valve seat passage 4300, and the exhaust valve spring 48 is disposed in exhaust valve housing passage 4200.

On the basis of the above structure, the upper end of the exhaust valve body passage 4100 of the exhaust valve body 41 is screwed with the exhaust valve joint screw 49, the exhaust valve nipple 413 is clamped between the head of the exhaust valve joint screw 49 and the upper end of the exhaust valve body 41, and the exhaust valve joint screw 49 has the exhaust valve joint screw passage 4900 respectively communicated with the exhaust valve body passage 4100 and the inner cavity of the exhaust valve nipple 413.

In addition to the above structure, the lower end of the exhaust valve body passage 4100 of the exhaust valve body 41 has a stepped hole structure, and the outside of the exhaust valve cover 42 has a stepped shaft structure engaged with the stepped hole structure.

In addition to the above structure, the lower end of the exhaust valve housing passage 4200 of the exhaust valve housing 42 has a stepped hole structure, and the exhaust valve seat 43 is fitted into the stepped hole structure.

Further, a first exhaust valve sealing ring 410 is arranged between the exhaust valve body 41 and the exhaust valve cover 42; a second exhaust valve sealing ring 411 is arranged between the exhaust valve cover 42 and the exhaust valve seat 43.

When the exhaust valve 4 is installed, the external threads on the outer wall of the lower part of the exhaust valve body 41 are in threaded connection with the interface on the pump head base 2, the exhaust valve body 41 is utilized to compress the exhaust valve cover 42 and the exhaust valve seat 43 in the interface of the pump head base 2, the exhaust valve oil nipple 413 is sleeved on the exhaust valve joint screw 49, the exhaust valve joint screw 49 is in threaded connection with the exhaust valve body channel 4100 of the exhaust valve body 41, the exhaust valve oil nipple 413 is clamped between the head of the exhaust valve joint screw 49 and the top end face of the exhaust valve body 41, the installation angle of the exhaust valve oil nipple 413 can be adjusted as required, and the exhaust valve joint screw 49 is screwed after adjustment.

When the exhaust valve 4 is used, the gas density is lower than that of the liquid, so that the gas can rise into the exhaust passage of the exhaust valve before the liquid, firstly jacks the second exhaust valve ball 47, then jacks the first exhaust valve ball 46, and finally is exhausted through the oil nozzle of the exhaust valve. In case fluid gets into discharge valve exhaust passage, fluid can push off second discharge valve ball 47, makes second discharge valve ball 47 block up the upper shed of second discharge valve ball chamber 45, and fluid is unable to be discharged from discharge valve exhaust passage like this, and in the same way, if fluid has passed through second discharge valve ball chamber 45, when meetting first discharge valve ball chamber 46, first discharge valve ball 46 can block up the wound of first discharge valve ball chamber 44. Even if a small amount of oil enters the exhaust passage of the exhaust valve along with the gas, the oil can be discharged into the oil pool through the oil nozzle of the exhaust valve.

The oil compensating valve 5 comprises an oil compensating valve body 51, an oil compensating valve rod 52, an oil compensating valve spring 53 and an oil compensating valve nut 54, the top end face of the oil compensating valve body 51 is a plane, an oil compensating valve hole 5100 which is vertically communicated with the oil compensating valve body 51 is vertically arranged on the oil compensating valve body 51, the top of the oil compensating valve hole 5100 is provided with an oil compensating valve inner chamfer valve port 5101, the upper end of the oil compensating valve body 51 is horizontally provided with an oil compensating valve radial through hole 5102 which is communicated with the oil compensating valve hole 5100, the middle part of the oil compensating valve hole 5100 is provided with an oil compensating valve inner hole shoulder 5103, the oil compensating valve rod 52 is inserted and matched in the oil compensating valve hole 5100 in a sliding mode, the upper end of the oil compensating valve rod 52 is provided with an oil compensating valve rod block 200 which forms a sealing pair with the oil compensating valve inner chamfer valve port 5101, the shapes of the oil compensating valve rod and the oil compensating valve rod block 5101 are matched, the oil compensating valve spring 53 is sleeved on the lower part of the oil compensating valve 52 and used for pulling the oil compensating valve rod 52 downwards to plug the oil compensating valve body, and the oil compensating valve is screwed with the oil compensating valve nut 5100, and the oil compensating valve in the bottom of the oil compensating valve 51.

Further, an oil filling valve high-pressure resistant gasket 55 is arranged on the top end face of the oil filling valve body 51, and the oil filling valve high-pressure resistant gasket 55 is preferably a red copper gasket.

Further, the clearance between the hole wall of the internal hole shoulder 5103 of the oil filling valve and the valve rod 52 of the oil filling valve is 0.35-0.65mm, and preferably 0.5mm.

It should be noted that the aperture of the internal hole shoulder 5103 of the oil compensating valve is the smallest aperture of the valve hole 5100 of the oil compensating valve, and the valve rod 52 of the oil compensating valve is in sliding fit with the hole wall of the internal hole shoulder 5103 of the oil compensating valve.

Further, the oil compensating valve body 51 is an integrally formed structure.

On the basis of the structure, the lower end of the oil compensating valve rod 52 is sequentially provided with an oil compensating valve spring seat 56 and an oil compensating valve nut 57, the upper end of the oil compensating valve spring 53 abuts against an oil compensating valve inner hole shoulder 5103, and the lower end abuts against the oil compensating valve spring seat 56.

On the basis of the structure, a first oil supplementing valve sealing ring 58 is arranged outside the oil supplementing valve body 51.

In addition to the above structure, a second oil compensation valve seal ring 59 is provided between the oil compensation valve body 51 and the oil compensation valve nut 54.

The oil replenishing valve 5 has the advantages that:

1) The top end face of the oil replenishing valve body 51 is a plane, so that the inner chamfer valve port 5101 of the oil replenishing valve is easy to machine, the sealing effect of the inner chamfer valve port 5101 of the oil replenishing valve is better, foreign matters are not easy to deposit on the plane, the plane is not easy to block, and the high-pressure resistance performance is stronger;

2) The oil supplementing valve body 51 is provided with an oil supplementing valve high-pressure resistant gasket 55 on the top end face, so that the high-pressure resistance can be improved;

3) An enough gap is reserved between the wall of the inner hole shoulder 5103 of the oil replenishing valve and the valve rod 52 of the oil replenishing valve, so that the inner hole shoulder 5103 of the oil replenishing valve is not easy to block;

4) The oil compensating valve body 51 is of an integrally formed structure, so that the production and the manufacture are easier, and the assembly is more convenient.

When the oil compensating valve 5 is used, oil enters the oil compensating valve hole 5100 from the oil compensating valve radial through hole 5102 and jacks up the oil compensating valve rod block 200, so that the internal chamfer valve hole 5101 of the oil compensating valve is opened, and the oil smoothly enters the oil compensating channel through the internal chamfer valve hole of the oil compensating valve.

And the diaphragm lining plate 6 is provided with lining plate flow guide holes 62 for allowing a medium to pass through, and the lining plate flow guide holes 62 are used for replacing the formed holes. Meanwhile, a lining plate groove 66 is formed on the first lining plate end surface 63 of the membrane lining plate 6. Liner board water conservancy diversion hole 62 is annular equipartition, and the evenly distributed of liner board water conservancy diversion hole 62 can make the liner board pressurized even, liner board water conservancy diversion hole 62 is located in the liner board recess 66 of the first liner board terminal surface 63 of diaphragm liner board 6. When the medium gets into, the medium contacts from the first welt terminal surface 63 of diaphragm welt, and the setting of welt recess 66 can increase the homogeneity that the medium flows, can follow welt recess 66 flow direction welt water conservancy diversion hole 62, gets into second welt terminal surface 64 in the welt water conservancy diversion hole 62, through the reciprocating motion of diaphragm, extrudes the medium from welt water conservancy diversion hole 62, utilizes the check valve of medium business turn over end can form unidirectional flow, can improve the volumetric efficiency of pump to little flow pump. And simultaneously, still be provided with on the first welt terminal surface 63 and be used for preventing welt pivoted cross recess 65, the one end of cross recess 65 extends to the edge of diaphragm welt 6, can produce pressure to the diaphragm welt at the medium entering in-process, because the existence of welt recess 66 and welt water conservancy diversion hole 62, can form longitudinal pressure for the diaphragm welt is rotatory, and it is fixed to cross recess 65 bayonet socket through the locating pin this moment, prevents to take place to rotate at the medium business turn over in-process.

Furthermore, the end face 64 of the second lining plate of the membrane lining plate is an arc concave surface, the end face is a volume cavity in which the membrane moves, and the membrane is driven by the motor to do reciprocating motion, so that the moving range of the membrane is enlarged, and the pressure intensity of the hydraulic pump is increased.

The invention adopts a single-diaphragm shovel plate 1 structure, and one end of the pump head 1 connected with the pump head base 2 is provided with a plurality of through holes corresponding to the lining plate diversion holes 62 of the diaphragm lining plate 6.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and these modifications or substitutions do not depart from the spirit of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. A hydraulic pump with long service life comprises a driving part (A), a transmission part (B) and an overflowing part (C) which are connected in a matching mode, wherein the overflowing part (C) comprises a pump head (1), a pump head base (2) fixedly matched with the pump head ((1)), one-way valves (3) respectively arranged on an inlet and an outlet of the pump head (1), an exhaust valve (4) and an oil supplementing valve (5) which are installed on the pump head base (2) in a matching mode, a cavity is formed between the pump head (1) and the pump head base (2), a diaphragm (7) and a diaphragm lining plate (6) are arranged in the cavity, the hydraulic pump is characterized in that the one-way valve (3) comprises a one-way valve shell assembly and a one-way valve core assembly arranged in the one-way valve shell assembly, the one-way valve shell assembly comprises a one-way valve body (34), the one-way valve core assembly (34) is arranged in the one-way valve body (34), the one-way valve body (34) is used for being matched with an interface of the pump head (1) in a screw joint, the one-way valve core assembly is tightly pressed on the pump head (1), the interface of the one-way valve shell assembly, the one-way valve cover (31) comprises an upper valve seat and a set of one-way valve cover (31) which is arranged in a symmetrical structure, and a set of the one-way valve cover (31) which is arranged in the one-way valve cover (31);

the exhaust valve (4) comprises an exhaust valve shell assembly, an exhaust valve exhaust channel is arranged in the exhaust valve shell assembly, a first exhaust valve ball cavity (44) and a second exhaust valve ball cavity (45) are sequentially arranged in the exhaust valve exhaust channel from top to bottom, a first exhaust valve ball (46) is arranged in the first exhaust valve ball cavity (44), a second exhaust valve ball (47) is arranged in the second exhaust valve ball cavity (45), an exhaust valve spring (48) used for tightly propping up the second exhaust valve ball (47) downwards is further arranged between the second exhaust valve ball (47) and the inner wall of the exhaust valve exhaust channel in a matching manner, an exhaust valve oil nozzle (413) communicated with the exhaust valve exhaust channel is installed at the upper end of the exhaust valve shell assembly in a matching manner, and the exhaust valve oil nozzle (413) is used for being connected with an oil sump in a matching manner;

the exhaust valve shell assembly comprises an exhaust valve body (41), an exhaust valve cover (42) and an exhaust valve seat (43) which are sequentially embedded from top to bottom, wherein the exhaust valve body (41) is in threaded fit with an interface of the pump head base (2) so as to press the exhaust valve cover (42) and the exhaust valve seat (43) in the interface of the pump head base (2);

the exhaust valve exhaust channel comprises an exhaust valve body channel (4100) arranged on the exhaust valve body (41), an exhaust valve cover channel (4200) arranged on the exhaust valve cover (42) and an exhaust valve seat channel (4300) arranged on the exhaust valve seat (43), the first exhaust valve ball cavity (44) is formed by the lower end of the exhaust valve body channel (4100) and the upper end of the exhaust valve cover channel (4200), the second exhaust valve ball cavity (45) is formed by the lower end of the exhaust valve cover channel (4200) and the upper end of the exhaust valve seat channel (4300), and the exhaust valve spring (48) is arranged in the exhaust valve cover channel (4200); the upper end of an exhaust valve body channel (4100) of the exhaust valve body (41) is in threaded connection with an exhaust valve joint screw (49), the exhaust valve oil nozzle (413) is clamped between the head of the exhaust valve joint screw (49) and the upper end of the exhaust valve body (41), and the exhaust valve joint screw (49) is provided with an exhaust valve joint screw channel (4900) which is respectively communicated with the exhaust valve body channel (4100) and the inner cavity of the exhaust valve oil nozzle (413);

the oil supplementing valve (5) comprises an oil supplementing valve body (51), an oil supplementing valve rod (52), an oil supplementing valve spring (53) and an oil supplementing valve screw cap (54), the top end face of the oil supplementing valve body (51) is a plane, an oil supplementing valve hole (5100) is vertically formed in the oil supplementing valve body (51), the top of the oil supplementing valve hole (5100) is provided with an oil supplementing valve inner chamfer valve port (5101), the upper end of the oil supplementing valve body (51) is horizontally provided with an oil supplementing valve radial through hole (5102) communicated with the oil supplementing valve hole (5100), the middle of the oil supplementing valve hole (5100) is provided with an oil supplementing valve inner hole shoulder (5103), the oil supplementing valve rod (52) is inserted and matched in the oil supplementing valve hole (5100) in a sliding mode, the upper end of the oil supplementing valve rod (52) is provided with an oil supplementing valve rod block (200) forming a sealing pair with the oil supplementing valve inner chamfer valve hole (5101), the oil supplementing valve spring (53) is sleeved on the lower portion of the oil supplementing valve body (52) and used for enabling the oil supplementing valve rod (5101) to be plugged towards the lower portion of the oil supplementing valve body (5101), and the oil supplementing valve nut (54) to plug the oil supplementing valve body;

the diaphragm liner plate (6) is provided with a liner plate flow guide hole (62) for a medium to pass through, and the second liner plate end face (64) of the diaphragm liner plate (6) is an arc-shaped concave face for movement of the diaphragm.

2. The hydraulic pump with long service life according to claim 1, wherein the upper end of the one-way valve bonnet (31) is provided with a third one-way valve annular step structure (3101), the lower end of the one-way valve bonnet is provided with a first one-way valve annular step structure (3100), the upper end and the lower end of the one-way valve seat (32) are provided with second one-way valve annular step structures (3200), the first one-way valve annular step structure (3100) of the upper end one-way valve bonnet (31) is buckled with the third one-way valve annular step structure (3101) of the lower end one-way valve bonnet (31), and the first one-way valve annular step structure (3100) of the lower end one-way valve bonnet (31) is buckled with the second one-way valve annular step structure (3200) of the one-way valve seat (32).

3. The hydraulic pump with long service life according to claim 1, wherein the check valve housing assembly further comprises a check valve pipe cap (35) and a check valve pipe sleeve (36), the check valve pipe cap (35) is in threaded connection with the upper end of the check valve body (34), the lower end of the check valve pipe sleeve (36) is provided with a check valve boss structure (3600), and the check valve boss structure (3600) is inserted into the check valve pipe cap (35) and clamped between the check valve body (34) and the inner wall of the top of the check valve pipe cap (35).

4. A hydraulic pump with a long service life according to any one of claims 1-3, characterized in that a high pressure resistant gasket (55) of the oil filling valve is provided on the top end face of the oil filling valve body (51).

5. A hydraulic pump with a long service life according to any one of claims 1-3, characterized in that the clearance between the bore wall of the internal bore shoulder (5103) of the oil compensating valve and the valve stem (52) of the oil compensating valve is 0.35-0.65mm; the oil supplementing valve body (51) is of an integrally formed structure.

6. A hydraulic pump with a long service life according to any one of claims 1-3, characterized in that a lining plate groove (66) is provided on the first lining plate end face (63) of the diaphragm lining plate (6), and the lining plate flow guide hole (62) is located in the lining plate groove (66).

7. A hydraulic pump with a long service life according to any one of claims 1-3, characterized in that the liner plate guide holes (62) are radially equispaced in a ring shape.

8. A hydraulic pump with a long service life according to claim 6, characterized in that the first liner plate end face (63) is further provided with a cross recess (65) for enlarging the flow of the medium, one end of the cross recess (65) extending to the edge of the diaphragm liner plate (6).