CN217761233U

CN217761233U - Miniature duplex plunger pump

Info

Publication number: CN217761233U
Application number: CN202121545371.XU
Authority: CN
Inventors: 杜修元; 高东峰; 杜茂森; 虞海洋
Original assignee: Shandong Zhongju Electric Co ltd
Current assignee: Shandong Zhongju Electric Co ltd
Priority date: 2021-07-08
Filing date: 2021-07-08
Publication date: 2022-11-08
Anticipated expiration: 2031-07-08

Abstract

The utility model discloses a miniature pair plunger pump belongs to the plunger pump field. It includes integrated into one piece's pump body and first motor, second motor. The pump body is provided with a water inlet pipeline, a water inlet cavity, a first group of water suction holes, a second group of water suction holes, a first group of water discharge holes, a second group of water discharge holes, a first plunger hole, a second plunger hole, a first plunger, a second plunger, a water outlet cavity and a water outlet pipeline; an upper pump cover and a lower pump cover are arranged on the upper side and the lower side of the pump body, and a water suction cavity, a working cavity, a drainage cavity and a connecting channel are arranged in the upper pump cover/the lower pump cover; the first motor and the second motor drive the first plunger piston and the second plunger piston to reciprocate through an eccentric mechanism, so that the suction and the discharge of liquid are realized. The utility model discloses set up two sets of plunger pump structures in a pump body, formed miniature pair plunger pump, its is small, compact structure, convenient to use, low in manufacturing cost, pressure and flow control are convenient, and the life of motor is high.

Description

Miniature duplex plunger pump

Technical Field

The utility model relates to a plunger pump field especially indicates a miniature pair plunger pump.

Background

The plunger pump realizes the suction and discharge of liquid by means of the change of the volume of the sealed working cavity through the reciprocating motion of the plunger in the pump body. The plunger pump has the advantages of high rated pressure, compact structure, high efficiency, convenient flow regulation and the like.

The plunger pump is widely applied to occasions where high pressure, large flow and flow need to be adjusted. The existing plunger pump generally adopts a pump body and is powered by a motor, the pressure and flow provided by a single plunger pump are smaller, and if larger flow and pressure are needed, the existing plunger pump generally solves the problems by the following two methods:

one approach is to combine two or more plunger pumps to connect the water inlets/outlets of multiple plunger pumps together via external piping to achieve greater flow and pressure. However, the combined use of a plurality of plunger pumps and the connection through the external pipeline lead to large overall volume, complex arrangement of the external pipeline and inconvenient use.

The other method is to enlarge the plunger pump and use a pump body structure with large volume and a motor with large specification as power. However, the cost of the plunger pump is increased sharply due to the large-size pump body structure and the large-size motor, and the manufacturing cost is high; the working current of the motor is large, so that the service life of the motor is influenced; the pressure and flow regulation is inconvenient, redundant power needs to be unloaded when small-pressure and small-flow operation is carried out, the power of a motor is wasted, and the economical efficiency is poor.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model provides a miniature duplex plunger pump, the utility model discloses it is small, compact structure, convenient to use, low in manufacturing cost, pressure and flow control are convenient, and the life of motor is high.

The utility model provides a technical scheme as follows:

the utility model provides a miniature pair plunger pump, includes the pump body and is located respectively the first motor and the second motor of pump body left and right sides, wherein:

the pump body is of an integrally formed structure, a water inlet cavity with an opening at the front end is formed in the front of the pump body, the opening at the front end of the water inlet cavity is connected with a water inlet pipeline, and the foremost end of the water inlet pipeline is a water inlet; the rear part of the pump body is provided with a water outlet cavity with an opening at the rear end, the opening at the rear end of the water outlet cavity is connected with a water outlet pipeline, and the rearmost end of the water outlet pipeline is provided with a water outlet;

the left side and the right side of the water inlet cavity are respectively provided with a first group of water suction holes and a second group of water suction holes, the first group of water suction holes and the second group of water suction holes respectively comprise two water suction hole units which are symmetrically arranged on the upper side and the lower side of the water inlet cavity and are communicated with the water inlet cavity, and a water suction one-way valve is arranged in each water suction hole unit;

the left side and the right side of the water outlet cavity are respectively provided with a first group of drain holes and a second group of drain holes, the first group of drain holes and the second group of drain holes respectively comprise two drain hole units symmetrically arranged on the upper side and the lower side of the water outlet cavity, each drain hole unit is communicated with the water outlet cavity through a high-pressure water outlet, and a drain one-way valve is arranged in each drain hole unit;

a first plunger hole is formed between the first group of water suction holes and the first group of water drainage holes, a second plunger hole is formed between the second group of water suction holes and the second group of water drainage holes, and the first plunger hole and the second plunger hole are both arranged in the vertical direction and penetrate through the upper surface and the lower surface of the pump body;

a first plunger and a second plunger in the vertical direction are respectively arranged in the first plunger hole and the second plunger hole, and the first motor and the second motor respectively drive the first plunger and the second plunger to reciprocate up and down through respective eccentric mechanisms;

the upper side and the lower side of the pump body are respectively and fixedly provided with an upper pump cover and a lower pump cover which are symmetrical, two groups of water suction cavities, working cavities and drainage cavities are respectively arranged in the upper pump cover and the lower pump cover, and each group of water suction cavities, working cavities and drainage cavities are communicated through a connecting channel; the positions of the water suction cavity, the working cavity and the water discharge cavity are respectively opposite to the positions of the water suction hole unit, the first plunger hole/second plunger hole and the water discharge hole unit.

Furthermore, the notch has all been seted up in the outside of first plunger and second plunger, eccentric mechanism includes eccentric wheel and eccentric wheel bearing, the output shaft of first motor and second motor respectively through respective eccentric wheel and eccentric wheel bearing with the notch cooperation of first plunger and second plunger, the drive reciprocating motion about on first plunger and the second plunger.

Furthermore, a first motor connecting hole and a second motor connecting hole are formed in the left side and the right side of the pump body respectively, the first motor connecting hole and the second motor connecting hole are arranged in the left-right direction and are communicated with the first plunger hole and the second plunger hole respectively, and the eccentric mechanisms of the first motor and the second motor are located in the first motor connecting hole and the second motor connecting hole respectively.

Furthermore, the output shafts of the first motor and the second motor are respectively connected with respective transmission gear sets, each transmission gear set comprises a driving gear connected with the output shafts of the first motor and the second motor, a duplicate gear set connected with the driving gear and a driven gear connected with the duplicate gear set, and the driven gear is connected with the eccentric wheel.

Furthermore, the upper end and the lower end of the first plunger/the second plunger are respectively sleeved with a sealing ring, a guide pressure pad and a water seal, the sealing ring is positioned between the first plunger/the second plunger and the first plunger hole/the second plunger hole, the guide pressure pad is positioned on the outer side of the sealing ring, one part of the guide pressure pad is pressed on the periphery of the sealing ring, the other part of the guide pressure pad is sleeved on the first plunger/the second plunger, and the water seal is positioned on the outer side of the guide pressure pad.

Furthermore, sealing gaskets are respectively arranged between the pump body and the upper pump cover and between the pump body and the lower pump cover.

Furthermore, the water suction one-way valve comprises a water suction one-way valve core and a water suction one-way valve spring, a water suction spring support column is arranged in the upper pump cover/the lower pump cover, one end of the water suction one-way valve spring is connected with the water suction spring support column, the other end of the water suction one-way valve spring is connected with the water suction one-way valve core, and the water suction one-way valve core is tightly pressed on the pump body at the water suction hole unit under the action of the water suction one-way valve spring to realize the one-way sealing of the water suction hole unit and the water suction cavity;

the drainage check valve comprises a drainage check valve core and a drainage check valve spring, a drainage spring support is arranged in the drainage hole unit, one end of the drainage check valve spring is connected with the drainage spring support, the other end of the drainage check valve spring is connected with the drainage check valve core, and the drainage check valve core is tightly pressed on an upper pump cover/a lower pump cover at the drainage cavity under the action of the drainage check valve spring to realize one-way sealing of the drainage hole unit and the drainage cavity;

the valve core of the water absorption one-way valve and the valve core of the water discharge one-way valve are made of elastic materials.

Furthermore, the side wall of the upper pump cover/the lower pump cover positioned on one side of the water suction cavity is provided with a fabrication hole communicated with the connecting channel, and the fabrication hole is blocked by a blocking structure after the micro duplex plunger pump is assembled.

Furthermore, the high-pressure water outlet is arranged on the side wall of the inner side of the drain hole unit.

Furthermore, the upper pump cover and the lower pump cover are respectively of an integrated structure, and two groups of water suction cavities, working cavities and drainage cavities are formed in the upper pump cover and the lower pump cover of the integrated structure;

or the upper pump cover and the lower pump cover respectively comprise two pump cover units which are separated, and a group of water suction cavity, a working cavity and a water drainage cavity are formed in each pump cover unit.

The utility model discloses following beneficial effect has:

the utility model discloses set up two sets of plunger pump structures in a pump body, formed miniature pair plunger pump, compared single plunger pump, realized double flow and pressure. The pump body is an integrated structure, and the structure and the position of the water inlet pipeline, the water inlet cavity, the first group of water suction holes, the first group of drain holes, the second group of water suction holes, the first plunger hole, the second plunger hole, the first plunger, the second plunger, the water outlet cavity, the water outlet pipeline and the water suction cavity in the upper pump cover/the lower pump cover are arranged, so that the two sets of plunger pump structures in the pump body share the water inlet pipeline and the water outlet pipeline on the same pump body, the whole size of the miniature duplex plunger pump is small, the structure is compact, the use is convenient, and the manufacturing cost is low.

The utility model discloses can the work of arbitrary motor of independent control, also can two motors simultaneous workings of simultaneous control, be applicable to little flow occasion and large-traffic occasion respectively, pressure and flow control are convenient, need not drop unnecessary power off-load when carrying out little pressure and little flow operation, and economic nature is good. And the specification of a single motor is small, when two motors work simultaneously, the current of the single motor is generally equivalent to the current of the single motor when the motor works, and the service life of the motor is long.

Drawings

FIG. 1 is a perspective view of a micro duplex plunger pump of the present invention;

FIG. 2 is a top view of the miniature dual plunger pump of the present invention;

fig. 3 isbase:Sub>A sectional view of the miniature duplex plunger pump of the present invention in the direction ofbase:Sub>A-base:Sub>A (the first motor and the second motor are omitted);

FIG. 4 is a sectional view of the miniature dual plunger pump of the present invention in the B-B direction (the first motor and the second motor are omitted);

fig. 5 is a C-C sectional view of the miniature dual plunger pump of the present invention (omitting the first motor and the second motor);

FIG. 6 is a schematic view of a drive gear set;

fig. 7 is a cross-sectional view of the miniature dual plunger pump of the present invention in the direction D-D (the first motor and the second motor are omitted);

FIG. 8 is a perspective view of the pump body;

FIG. 9 is a horizontal cross-sectional view of the pump body;

FIG. 10 is a perspective view of a pump cover unit;

fig. 11 is a sectional view of the pump cover unit.

Detailed Description

In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following detailed description will be given with reference to the accompanying drawings and specific embodiments.

The embodiment of the utility model provides a miniature pair plunger pump, for the convenient description to miniature pair plunger pump structure, the utility model discloses in to the definition of upper and lower, left and right, preceding, rear position etc. see in figure 1 to the mark of upper and lower, left and right, preceding, back, the position of upper and lower, left and right, preceding, back in other figures uses the position of figure 1 mark as the standard.

As shown in fig. 1 to 11, the micro duplex plunger pump includes a pump body 1, and a first motor 2 and a second motor 3 respectively located at the left and right sides of the pump body 1, wherein:

the utility model discloses a pump body 1 is the duplex pump body, and this duplex pump body is integrated into one piece's structure, and front end open-ended intake chamber 4 has been seted up to pump body 1 front portion, and the opening of intake chamber 4 front end is connected with inlet channel 5. The foremost end of the water inlet pipeline 5 is provided with a water inlet 6, and the water inlet 6 is used for being connected with an external water inlet pipeline. In one example, the outer surface of the water inlet is provided with a connection structure such as a thread connected with an external water inlet pipeline.

The rear part of the pump body 1 is provided with a water outlet cavity 7 with an opening at the rear end, and the opening at the rear end of the water outlet cavity 7 is connected with a water outlet pipeline 8. The water outlet 9 is arranged at the rearmost end of the water outlet pipeline 8, and the water outlet 9 is used for being connected with an external water outlet pipeline. In one example, the outer surface of the water outlet is provided with a connection structure such as a screw thread connected with an external water outlet pipe.

The left side and the right side of the water inlet cavity 4 are respectively provided with a first group of water suction holes 10 and a second group of water suction holes 11, the first group of water suction holes 10 and the second group of water suction holes 11 respectively comprise two water suction hole units 10', 10', 11' which are symmetrically arranged on the upper side and the lower side of the water inlet cavity 4 and communicated with the water inlet cavity 4, and a water suction one-way valve 12 is arranged in each water suction hole unit.

The left side and the right side of the water outlet cavity 7 are respectively provided with a first group of drain holes 13 and a second group of drain holes 14, the first group of drain holes 13 and the second group of drain holes 14 respectively comprise two drain hole units 13', 13', 14' which are symmetrically arranged on the upper side and the lower side of the water outlet cavity 7, each drain hole unit is communicated with the water outlet cavity 7 through a high-pressure water outlet 15, and a drain check valve 16 is arranged in each drain hole unit.

A first plunger hole 17 is formed between the first group of water suction holes 10 and the first group of drain holes 13, a second plunger hole 18 is formed between the second group of water suction holes 11 and the second group of drain holes 14, and the first plunger hole 17 and the second plunger hole 18 are arranged in the vertical direction and penetrate through the upper surface and the lower surface of the pump body 1.

The first plunger hole 17 and the second plunger hole 18 are respectively provided therein with a first plunger 19 and a second plunger 20 in the up-down direction, and the first motor 2 and the second motor 3 respectively drive the first plunger 19 and the second plunger 20 to reciprocate up and down through respective

eccentric mechanisms

21, 22. The present invention does not limit the specific structure of the

eccentric mechanisms

21 and 22, as long as the first plunger 17 and the second plunger 18 can reciprocate up and down.

The upper and lower both sides of the pump body 1 are respectively and fixedly provided with a symmetrical upper pump cover 27 and a symmetrical lower pump cover 28, two groups of water suction cavities 23, working cavities 24 and water drainage cavities 25 are respectively arranged in the upper pump cover 27 and the lower pump cover 28, and each group of water suction cavities 23, working cavities 24 and water drainage cavities 25 are communicated through a connecting channel 26.

The positions of the suction chamber 23, the working chamber 24 and the drain chamber 25 are located outside the suction hole units 10', 10", 11', 11", the first plunger hole 17/the second plunger hole 18 and the drain hole units 13', 13", 14', 14", respectively, and the positions of the suction chamber 23, the working chamber 24 and the drain chamber 25 are opposite to the positions of the suction hole units 10', 10", 11', 11", the first plunger hole 17/the second plunger hole 18 and the drain hole units 13', 13", 14', 14", respectively.

The utility model discloses at the during operation, the rotation of first motor 2 and second motor 3 drives first plunger 17 and second plunger 18 up-and-down reciprocating motion through respective

eccentric mechanism

21, 22. The working chambers 24 on the upper pump cover 27 and the lower pump cover 28 are opposite to the first plunger hole 17/the second plunger hole 18. The first plunger 17 and the second plunger 18 reciprocate back and forth so that the volume of the working chamber 24 alternately increases and decreases.

When the volume of the working chamber 24 increases, the pressure in the working chamber 24 decreases, and the low pressure is transmitted to the suction check valve 12 in the suction hole unit 10', 10", 11', 11" through the connection passage 26 and the suction chamber 23, so that the suction check valve 12 is opened; at the same time, the low pressure is transferred to the drain check valve 16 in the drain hole unit 13', 13", 14', 14" through the connection passage 26 and the drain chamber 25, so that the drain check valve 16 is closed.

After the water-absorbing one-way valve 12 is opened, the liquid in the water inlet cavity 4 enters the working cavity 24 through the water-absorbing hole units 10', 10', 11', the water-absorbing cavity 23 and the connecting channel 26 under the action of low pressure, and the water-absorbing action is finished. Meanwhile, external liquid enters the water inlet cavity 4 through the external water inlet pipeline, the water inlet 6 and the water inlet pipeline 5.

When the volume of the working chamber 24 is reduced, the pressure in the working chamber 24 is increased, and the high pressure is transmitted to the suction check valve 12 in the suction hole unit 10', 10", 11', 11" through the connection passage 26 and the suction chamber 23, so that the suction check valve 12 is closed; at the same time, the high pressure is transferred to the drain check valve 16 in the drain hole unit 13', 13", 14', 14" through the connection passage 26 and the drain chamber 25, so that the drain check valve 16 is opened.

After the drainage check valve 16 is opened, the liquid in the working chamber 24 enters the water outlet chamber 7 through the connecting channel 26, the drainage chamber 25, the drainage hole units 13', 13", 14', 14" and the high-pressure water outlet 15 under the action of high pressure, and enters an external water outlet pipeline through the water outlet pipeline 8 and the water outlet 9, so that the water outlet action is completed.

The utility model discloses can the work of arbitrary motor of independent control, also can two motors of simultaneous control simultaneous working, be applicable to little flow occasion and large-traffic occasion respectively, pressure and flow control are convenient, need not drop unnecessary power off-load when carrying out little pressure and little flow operation, and economic nature is good. And the specification of a single motor is small, when two motors work simultaneously, the current of the single motor is approximately equal to the current of the motor when the motor works, and the service life of the motor is long.

In one example, notches 29 are formed in the outer sides of the first plunger 19 and the second plunger 20, each

eccentric mechanism

21 and 22 comprises an eccentric wheel 30 and an eccentric wheel bearing 31, and the output shafts 32 of the first motor 2 and the second motor 3 are respectively matched with the notches 29 of the first plunger 19 and the second plunger 20 through the respective eccentric wheels 30 and eccentric wheel bearings 31 to drive the first plunger 19 and the second plunger 20 to reciprocate up and down.

In order to realize the matching of the first plunger 19 and the second plunger 20 with the first motor 2 and the second motor 3, the left side and the right side of the pump body 1 are respectively provided with a first motor connecting hole 33 and a second motor connecting hole 34, the first motor connecting hole 33 and the second motor connecting hole 34 are both arranged in the left-right direction and are respectively communicated with the first plunger hole 17 and the second plunger hole 18, and the

eccentric mechanisms

21 and 22 of the first motor 2 and the second motor 3 are respectively positioned in the first motor connecting hole 33 and the second motor connecting hole 34.

The output shafts 32 of the first motor 2 and the second motor 3 are respectively connected with respective transmission gear sets 35, the transmission gear sets 35 are used for transmission and speed reduction, the transmission gear sets 35 are located in a reduction gearbox 50, and the reduction gearbox 50 is formed by splicing an inner gear box shell 51 and an outer gear box shell 52.

The transmission gear set 35 includes a driving gear 36 connected to the output shafts 32 of the first and

second motors

2 and 3, a double gear set 37 connected to the driving gear 36, and a driven gear 38 connected to the double gear set 37, and the driven gear 38 is connected to the eccentric wheel 30.

First plunger and second plunger reciprocating motion back and forth, for preventing that the liquid in the working chamber from getting into reducing gear box and motor through the gap between first plunger/second plunger and the pump body/last pump cover/lower pump cover, the utility model discloses all overlap on first plunger 19/second plunger 20's upper and lower both ends and have sealing washer 39, direction pressure pad 40 and water seal 41, sealing washer 39, direction pressure pad 40 and water seal 41 receive the pump body, go up the pump cover, the restraint of pump cover is fixed motionless down, first plunger 19/second plunger 20 when reciprocating motion back and forth with sealing washer 39, direction pressure pad 40 and water seal 41 relative slip, realize the sealed to liquid.

Specifically, the gasket 39 is located between the first/

second plungers

19, 20 and the first plunger bore 17

Between the second plunger hole 18, a guide pressure pad 40 is positioned at the outer side of a sealing ring 39, one part of the guide pressure pad 40 is pressed on the periphery of the sealing ring 39, the other part of the guide pressure pad is sleeved on the first plunger 19/the second plunger 20, the guide pressure pad 40 is positioned at the joint of the pump body 1 and the upper pump cover/the lower pump cover, a water seal 41 is positioned at the outer side of the guide pressure pad 40, and the water seal 41 is positioned in the upper pump cover/the lower pump cover.

The first plunger 19/the second plunger 20 slide-rubs against the packing 39, the guide pressure pad 40 and the water seal 41 during the back-and-forth reciprocation, which easily wears the outer surface of the first plunger 19/the second plunger 20 and causes scratches. After the first plunger 19/the second plunger 20 is scratched, the sealing with the sealing ring 39, the guide pressure pad 40 and the water seal 41 cannot be ensured, the service life of the first plunger 19/the second plunger 20 is shortened, and the sealing effect is reduced.

In order to prolong the service life and improve the sealing effect of the first plunger 19/the second plunger 20, the utility model discloses the surface at the friction position of the first plunger 19/the second plunger 20 and the sealing ring 39, the guide pressure pad 40 and the water seal 41 is provided with the wear-resistant ceramic layer.

Sealing gaskets 42 are respectively arranged between the pump body 1 and the upper pump cover 27 and the lower pump cover 28, so that waterproof sealing between the pump body 1 and the upper pump cover 27 and the lower pump cover 28 is realized.

The check valve in the prior art generally comprises a valve seat, a valve core and a spring, wherein the valve core is pressed on the valve seat through the spring to realize sealing in one direction, and when the pressure of liquid is greater than the pressure of the spring, the valve seat and the valve core are opened to realize conduction in the other direction.

However, the check valve in the prior art has the disadvantages of complex structure, more parts and inconvenient assembly, the valve seat and the valve core are hard parts, the pressure sealing of the spring is relied on, the spring with larger elasticity is needed, and the machining precision of the contact surface of the valve seat and the valve core is required.

The utility model discloses a check valve 12 absorbs water includes the check valve case 43 that absorbs water and the check valve spring 44 that absorbs water, upward be provided with the spring pillar 45 that absorbs water in the pump cover 27/lower pump cover 28, the one end and the spring pillar 45 that absorbs water of check valve spring 44 are connected, the other end is connected with the check valve case 42 that absorbs water, the check valve case 43 that absorbs water compresses tightly under the effect of the check valve spring 44 that absorbs water on the pump body 1 of suction hole unit 10', 10", 11', 11" department, realize the one-way sealing to suction hole unit 10', 10", 11', 11" and suction cavity 23, the material of the check valve case 43 that absorbs water is elastic material.

The utility model discloses set up the check valve case 43 that absorbs water into elastic material, left out the disk seat, the check valve case 43 that absorbs water directly cooperates with the pump body 1, realizes one-way sealing under the pressure of the check valve spring 44 that absorbs water. The valve seat component is omitted, the number of components is small, and the assembly is simple. The valve core 43 of the water absorption one-way valve is made of elastic materials, the sealing with the pump body is convenient, the requirement on the elasticity of a spring is not high, and the requirement on the processing precision is also low.

Similarly, the drain check valve 16 includes a drain check valve core 46 and a drain check valve spring 47, a drain spring support 48 is disposed in the drain hole units 13', 13", 14', 14", one end of the drain check valve spring 47 is connected to the drain spring support 48, the other end is connected to the drain check valve core 46, the drain check valve core 46 is pressed against the upper pump cover 27/the lower pump cover 28 at the drain cavity 25 by the drain check valve spring 47, so as to realize one-way sealing of the drain hole units 13', 13", 14', 14" and the drain cavity 25, and the drain check valve core 46 is made of an elastic material.

The connecting channel 26 for communicating the water suction cavity 23, the working cavity 24 and the drainage cavity 25 is inconvenient to process, in order to realize the convenient processing of the channel communication 26, the side wall of the upper pump cover 27/the lower pump cover 28 positioned on one side of the water suction cavity 23 is provided with a fabrication hole 49 communicated with the connecting channel 26, and the fabrication hole 49 is blocked by a blocking structure after the micro duplex plunger pump is assembled, thereby preventing water leakage.

The aforementioned high-pressure water outlets 15 are opened on the side walls inside the drain hole units 13', 13", 14', 14".

The utility model discloses in, go up pump cover 27 and lower pump cover 28 structure as an organic whole respectively, all seted up two sets of chamber 23 that absorb water, working chamber 24 and drainage chamber 25 in the last pump cover 27 of a body structure and the lower pump cover 28. The upper pump cover 27 and the lower pump cover 28 which are integrally structured reduce the number of parts, and are convenient to assemble.

Or, the upper pump cover 27 and the lower pump cover 28 respectively include two pump cover units 27', 27", 28', 28" which are separated, and a group of water suction cavity 23, working cavity 24 and water drainage cavity 25 are respectively arranged in each pump cover unit 27', 27", 28', 28".

The foregoing is a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.

Claims

1. The utility model provides a miniature pair plunger pump which characterized in that, includes the pump body and is located respectively the first motor and the second motor of pump body left and right sides, wherein:

the upper side and the lower side of the pump body are respectively and fixedly provided with an upper pump cover and a lower pump cover which are symmetrical, two groups of water suction cavities, working cavities and drainage cavities are respectively arranged in the upper pump cover and the lower pump cover, and each group of water suction cavities, working cavities and drainage cavities are communicated through a connecting channel; the positions of the water suction cavity, the working cavity and the water discharge cavity are respectively opposite to the positions of the water suction hole unit, the first plunger piston hole/second plunger piston hole and the water discharge hole unit.

2. The miniature dual plunger pump according to claim 1, wherein the first plunger and the second plunger are provided with notches on the outer sides thereof, the eccentric mechanism comprises an eccentric wheel and an eccentric wheel bearing, and the output shafts of the first motor and the second motor are respectively matched with the notches of the first plunger and the second plunger through the respective eccentric wheel and the eccentric wheel bearing to drive the first plunger and the second plunger to reciprocate up and down.

3. The miniature dual plunger pump according to claim 2, wherein a first motor connecting hole and a second motor connecting hole are respectively formed in the left side and the right side of the pump body, the first motor connecting hole and the second motor connecting hole are both arranged in the left-right direction and are respectively communicated with the first plunger hole and the second plunger hole, and the eccentric mechanisms of the first motor and the second motor are respectively located in the first motor connecting hole and the second motor connecting hole.

4. A micro-size dual plunger pump according to claim 3, wherein the output shafts of the first and second motors are respectively connected with a respective transmission gear set, the transmission gear set comprises a driving gear connected with the output shafts of the first and second motors, a dual gear set connected with the driving gear, and a driven gear connected with the dual gear set, and the driven gear is connected with the eccentric wheel.

5. The miniature dual plunger pump according to claim 1, wherein the upper and lower ends of the first/second plunger are respectively sleeved with a sealing ring, a guiding pressure pad and a water seal, the sealing ring is located between the first/second plunger and the first/second plunger hole, the guiding pressure pad is located outside the sealing ring, one part of the guiding pressure pad is pressed on the periphery of the sealing ring, the other part of the guiding pressure pad is sleeved on the first/second plunger, and the water seal is located outside the guiding pressure pad.

6. The miniature dual plunger pump of claim 5, wherein a gasket is disposed between the pump body and each of the upper and lower pump caps.

7. The miniature dual plunger pump of claim 1, wherein said suction check valve comprises a suction check valve core and a suction check valve spring, and a suction spring support is provided in said upper/lower pump cover, one end of said suction check valve spring is connected to said suction spring support, and the other end is connected to said suction check valve core, and said suction check valve core is pressed against the pump body at said suction hole unit under the action of said suction check valve spring, so as to realize the one-way sealing of said suction hole unit and suction chamber;

8. The micro duplex plunger pump according to claim 1, wherein a fabrication hole communicated with the connecting channel is formed in a side wall of the upper pump cover/the lower pump cover on one side of the water suction cavity, and the fabrication hole is blocked by a blocking structure after the micro duplex plunger pump is assembled.

9. The micro-size tandem plunger pump according to any one of claims 1 to 8, wherein the high pressure water outlet is opened on a side wall inside the water discharging hole unit.

10. The micro duplex plunger pump according to any one of claims 1 to 8, wherein the upper pump cover and the lower pump cover are respectively of an integrated structure, and two sets of water suction cavities, working cavities and drainage cavities are respectively arranged in the upper pump cover and the lower pump cover of the integrated structure;