CN219865430U - Bidirectional non-return diaphragm plunger pump - Google Patents

Abstract

The utility model relates to a bidirectional non-return diaphragm plunger pump, which comprises a pump body, a motor, a liquid inlet check valve, a liquid outlet check valve, a diaphragm membrane and a plunger assembly, wherein the liquid inlet check valve, the liquid outlet check valve, the diaphragm membrane and the plunger assembly are arranged in a mounting cavity of the pump body, the motor is arranged on the pump body, the output end of the motor penetrates through the mounting cavity of the pump body to be connected with the plunger assembly, the plunger assembly is connected with the diaphragm membrane and extends into a liquid cavity of the pump, the liquid inlet check valve and the liquid outlet check valve are respectively arranged in a liquid inlet channel and a liquid outlet channel of the pump body, a pressure boosting cavity is further formed in the pump body, the pressure boosting cavity is communicated with the liquid inlet channel and the liquid outlet channel, the liquid outlet channel is sealed by the non-return membrane, only a liquid return hole communicated with the liquid inlet channel is formed in the inner wall of the pump body, and a communication channel opposite to the liquid cavity of the pump body is formed in the inner wall of the pump body. According to the diaphragm pump, liquid countercurrent caused by liquid level difference in the water inlet and the water outlet can be eliminated, so that the diaphragm pump has an excellent sealing effect, and liquid leakage in a non-working state is avoided.

Description

Bidirectional non-return diaphragm plunger pump

Technical Field

The utility model relates to the technical field of diaphragm pumps, in particular to a bidirectional non-return diaphragm plunger pump.

Background

The diaphragm pump is a valve taking a driving device, a diaphragm membrane, a pump body and an inlet/outlet single-phase valve as main structures, and the diaphragm membrane is driven by the driving device to reciprocate back and forth so as to enable a pump liquid cavity in the pump body to periodically change, thereby driving the inlet/outlet single-phase valve to be sequentially opened and closed, and realizing pumping of liquid.

The utility model provides an import single-phase valve in the current diaphragm pump only can reverse non-backstop, can not forward backstop, open the flowing back when opening the flowing back in the time of the feed liquor promptly import check valve, and export check valve then in contrast, when the diaphragm pump is non-operating condition, if there is the hydrops in the water inlet, and there is the liquid level differential between the delivery port, then under the effect of liquid pressure, there is the phenomenon that liquid was discharged from the delivery port, cause the weeping problem to appear when the diaphragm pump is non-operating condition, for this, the publication is CN217055536U, the patent name is "a high leakproofness diaphragm pump with backstop function", this diaphragm pump installs the end cap that has the cavity passageway in the play water storehouse, press the sealing washer that is used for shutoff cavity passageway between end and the lower extreme of apopore, the up end of end cap is equipped with the mounting groove, the peripheral edge extension of cavity passageway upper port is equipped with the annular bulge that is used for forming the difference in height, the sealing washer includes the annular portion that is fit with the mounting groove, be used for sealing cavity passageway's middle part and be used for connecting annular portion and middle part and evenly arranging and being used for connecting annular portion, the effect of sealing cavity passageway's high leakproofness when the water level differential, the annular portion is still arranged at this moment, the water level differential effect is still can not in the cavity passageway at the water inlet under the water level condition, the water inlet elastic condition is formed at the water outlet, the annular position is still can not high enough to the hollow passageway under the water level condition, the water pressure condition is not can be had the sealing rib, the water level condition to be had the sealing performance at the water inlet seal is still can not had.

However, the diaphragm pump with the structure can only play a positive non-return role when the accumulated liquid in the water inlet is less, when the accumulated liquid in the water inlet is more, larger liquid pressure can be correspondingly generated, and the elastic ribs of the sealing gasket deform under the action of the larger liquid pressure, so that the liquid in the hollow channel still can wash the middle part to cause the diaphragm pump to leak liquid in a non-working state.

Disclosure of Invention

In order to solve the problem that liquid leakage is caused by the fact that liquid in a hollow channel still rushes out of the middle part when the elastic ribs of the sealing gasket deform when a large amount of accumulated liquid exists in the water inlet to generate large liquid pressure in the non-working state of the diaphragm pump with the non-return function, the utility model aims to provide the diaphragm plunger pump capable of eliminating liquid backflow caused by liquid level difference in the water inlet and the water outlet, further having an excellent sealing effect and avoiding liquid leakage in the non-working state.

In order to achieve the above object, the technical solution of the present utility model is:

the utility model provides a two-way check diaphragm plunger pump, it includes the pump body, a motor, and locate the feed liquor check valve in the pump body installation cavity, flowing back check valve, the diaphragm, the plunger subassembly, on the pump body is located to the motor, its output link up to the installation cavity of pump body in be connected with the plunger subassembly, the plunger subassembly is connected with the diaphragm, and extend to in the pump liquid chamber, the feed liquor check valve, the flowing back check valve is located respectively in the feed liquor runner and the flowing back runner of pump body, still be formed with the chamber of stepping up in the pump body, step up chamber and feed liquor runner and flowing back runner intercommunication, be equipped with the check diaphragm in the chamber of stepping up, the check diaphragm seals the flowing back runner, it only has the return liquid hole with the feed liquor runner intercommunication, the pump body has seted up the intercommunication passageway relative with the pump liquid chamber on its step up chamber inner wall.

Preferably, one end of the communication passage extends to a position opposite to the drain check valve.

Preferably, the pump body is provided with a communicating pipe positioned in the liquid cavity of the pump, the section of the communicating pipe is arc-shaped, and the communicating pipe passes through the liquid return hole on the non-return diaphragm to the communicating channel to communicate with the communicating channel.

Preferably, a pagoda spring opposite to the liquid discharge one-way valve is arranged in the pressure boosting cavity, and two ends of the pagoda spring are respectively abutted against the non-return diaphragm and the inner wall of the pressure boosting cavity.

Preferably, the non-return diaphragm is provided with a sinking groove for accommodating the pagoda spring, the bottom wall of the sinking groove and the inner wall of the boosting cavity are respectively provided with a lower convex column and an upper convex column which are opposite to each other, and two ends of the pagoda spring are respectively sleeved on the lower convex column and the upper convex column.

Preferably, the liquid inlet one-way valve and the liquid outlet one-way valve are umbrella valves.

Preferably, the plunger assembly comprises an eccentric wheel and a crankshaft, wherein the eccentric wheel is eccentrically connected with the output end of the motor, one end of the crankshaft is connected with the diaphragm membrane, and the other end of the crankshaft forms a containing groove which is sleeved outside the eccentric wheel through the containing groove.

Preferably, the plunger assembly further comprises a ball bearing, wherein the ball bearing is arranged in the accommodating groove of the crankshaft and sleeved outside the eccentric wheel.

Preferably, the pump body comprises a balance bin, a water inlet and outlet cover and a base, the balance bin, the water inlet and outlet cover and the base are detachably connected, a liquid inlet pipe and a liquid outlet pipe are formed on the water inlet and outlet cover, the liquid inlet flow passage and the liquid outlet flow passage are formed in the water inlet and outlet cover and are respectively communicated with inner pipe sections of the liquid inlet pipe and the liquid outlet pipe, the motor is arranged on the base, and the mounting cavity, the pump liquid cavity and the boosting cavity are respectively formed in the base, the water inlet and outlet cover and the balance bin.

Preferably, the balance bin, the water inlet and outlet cover and the base are connected through screw threads.

Compared with the prior art, the utility model has the advantages that:

according to the diaphragm plunger pump disclosed by the utility model, reverse check is realized through the liquid inlet check valve and the liquid outlet check valve, and by utilizing the principle of the communicating vessel, when the accumulated liquid in the water inlet end of the liquid inlet channel is larger or smaller, the liquid level in the communicating channel is ensured to be consistent with the liquid level in the liquid cavity of the pump, so that the pressure on two sides of the check diaphragm on the same horizontal line is equal, the phenomenon that the liquid outlet check valve cannot move under the action of the liquid pressure in the liquid cavity of the pump to jack up the check diaphragm to open the liquid outlet channel is avoided, and forward check is realized, so that the diaphragm plunger pump disclosed by the utility model has excellent sealing performance even if the accumulated liquid in the water inlet end of the liquid inlet channel is more in a non-working state.

Drawings

FIG. 1 is a schematic view of the overall structure of a diaphragm plunger pump of the present utility model;

FIG. 2 is a schematic cross-sectional view of a diaphragm pump according to the present utility model at a first view angle (arrows in the figure indicate the flow direction of water when water is fed);

FIG. 3 is a schematic cross-sectional view of a diaphragm pump according to the present utility model at a second view angle (arrows in the figure indicate the flow direction of water when water is fed);

FIG. 4 is a schematic diagram of the overall structure of a first view angle when a balance bin of a pump body of a diaphragm plunger pump is separated (an arrow in the figure is the direction of water entering from a water inlet pipe and then exiting from a communicating pipe when water enters);

FIG. 5 is a schematic diagram of the overall structure of the pump body of the diaphragm plunger pump according to the present utility model at a second view angle when the balance bin is separated (the arrow in the figure is the direction in which water enters from the water inlet pipe and enters the communication channel after exiting from the communication pipe);

FIG. 6 is a schematic diagram of the overall structure of a third view angle when a balance bin of a pump body of a diaphragm plunger pump is separated (an arrow in the figure is the direction when water enters from a water inlet pipe and is discharged from a communicating pipe and then enters a communicating channel and is injected into a non-return diaphragm sinking groove);

FIG. 7 is a schematic diagram of the overall structure of a pump body balance bin of the diaphragm plunger pump of the present utility model;

FIG. 8 is a schematic view of the overall structure of the check diaphragm of the diaphragm plunger pump of the present utility model;

FIG. 9 is a schematic diagram of the overall structure of the pump body water inlet and outlet cover of the diaphragm plunger pump of the present utility model;

fig. 10 is a schematic view of the overall structure of the pump body of the diaphragm plunger pump according to the present utility model from another view angle of the water inlet and outlet cover.

Fig. 11 is a schematic view showing the overall structure of the pump body of the diaphragm plunger pump of the present utility model after the base is disassembled.

As shown in the figure:

1. a pump body; 1a, a liquid inlet flow channel; 1b, a liquid discharge runner; 101. a balance bin; 101a, a boost cavity; 101b, communication channels; 101c, upper convex columns; 102. a water inlet and outlet cover; 102a, pumping liquid cavity; 102b, communicating tube; 102c, a liquid inlet pipe; 102d, a liquid discharge pipe; 103. a base; 103a, a mounting cavity; 2. a motor; 3. a liquid inlet one-way valve; 4. a liquid discharge one-way valve; 5. a diaphragm membrane; 6. a non-return membrane; 601. a liquid return hole; 602. sinking grooves; 603. a lower convex column; 7. a pagoda spring; 8. an eccentric wheel; 9. a crankshaft; 901. a storage groove; 10. a ball bearing; 11. and (5) a bolt.

Detailed Description

The utility model will be described in further detail with reference to the drawings and the specific examples.

In the description of the present utility model, it should be noted that, directions or positional relationships indicated by terms such as "upper", "lower", "left", "right", "inner", "outer", etc. are based on directions or positional relationships shown in the drawings, or directions or positional relationships in which the inventive product is conventionally put in use, are merely for convenience of description, and are not intended to indicate or imply that the directions are necessarily specific directions and specific direction configurations and operations, and thus should not be construed as limiting the present utility model.

As shown in fig. 1 to 8, the utility model relates to a bidirectional non-return diaphragm plunger pump, which comprises a pump body 1, a motor 2, a liquid inlet one-way valve 3, a liquid discharge one-way valve 4, a diaphragm membrane 5 and a plunger component which are shared by the conventional diaphragm pump, wherein the motor 2 is fixed on the pump body 1, the pump body 1 is provided with a mounting cavity 103a and a pump liquid cavity 102a, and is also provided with a liquid inlet channel 1a and a liquid discharge channel 1b, the output end of the motor 2 penetrates into the mounting cavity 103a, the plunger component is connected with the diaphragm membrane 5 and is arranged in the mounting cavity 103a, the plunger component is also connected with the output end of the motor 2 penetrating into the mounting cavity 103a, the diaphragm membrane 5 extends into the pump liquid cavity 102a, the liquid inlet one-way valve 3 and the liquid discharge one-way valve 4 are respectively arranged in the liquid inlet channel 1a and the liquid discharge channel 1b, the plunger component swings to drive the connected diaphragm membrane 5 to reciprocate forwards and backwards when the motor 2 operates, a container of the pump liquid cavity 102a changes when the diaphragm 5 moves, so as to form negative pressure liquid inlet or pump liquid is sucked into the diaphragm membrane 102a, and the liquid outlet one-way valve 4 can be opened only when the liquid inlet and the liquid outlet one-way valve 4 is opened, and the one-way valve is opened respectively;

in particular, a pressure boosting cavity 101a is formed in the pump body 1, the pressure boosting cavity 101a is communicated with the liquid inlet channel 1a and the liquid outlet channel 1b, namely, the pressure boosting cavity 101a is communicated with the liquid outlet channel 102a through the liquid inlet channel 1a and the liquid outlet channel 1b, a non-return diaphragm 6 is arranged in the pressure boosting cavity 101a, the non-return diaphragm 6 covers the opening of the pressure boosting cavity 101a, the liquid outlet channel 1b is closed, the non-return diaphragm 6 is made of rubber, the liquid outlet channel 1b can be opened when the non-return diaphragm 6 is deformed, a liquid return hole 601 is formed on the non-return diaphragm 6, the liquid return hole 601 is opposite to the liquid inlet channel 1a, the pressure boosting cavity 101a is isolated from the liquid outlet channel 1b through the liquid return hole 601, a communication channel 101b is formed on the inner wall of the pressure boosting cavity 101a opposite to the liquid outlet channel 1b, the communication channel 101b is positioned on the inner wall of the side opposite to the liquid outlet channel 102a, the communication channel 101b can be regarded as a liquid inlet channel 101b communicating with the liquid inlet channel 1a from both ends of the liquid inlet channel and the liquid inlet channel 1b when the non-return diaphragm 6 is deformed, the liquid inlet channel is communicated with the liquid inlet channel 1a through the liquid inlet channel 1b, the liquid inlet channel is communicated with the liquid inlet channel 1b through the liquid inlet channel is communicated channel 1b at both ends,

when the diaphragm pump is in a non-working state, if liquid accumulation exists in the water inlet end of the liquid inlet channel 1a, the liquid inlet check valve 3 still enables the liquid inlet channel 1a to be conducted under the action of liquid pressure due to the liquid level difference between the communication channel 101b and the water inlet end of the liquid inlet channel 1a, the liquid accumulation sequentially passes through the pump liquid cavity 102a, the rest part of the liquid inlet channel 1a and the liquid return hole 601 of the non-return diaphragm 6 to enter the communication channel 101b, and the liquid accumulation can completely enter the pump liquid cavity 102a under the condition that the liquid accumulation is less because the communication channel 101b is only opposite to the pump liquid cavity 102a until the liquid level in the communication channel 101b is consistent with the liquid level in the pump liquid cavity 102a or the liquid accumulation is more, the liquid level in the communication channel 101b is still consistent with the liquid level in the pump liquid cavity 102a at the moment, the liquid return check valves 4 on the same horizontal line are not capable of moving under the action of the liquid pressure in the pump liquid cavity 102a to enable the non-return diaphragm 6 to be opened to the non-return diaphragm 1, so that the liquid accumulation can be prevented from entering the liquid inlet end of the diaphragm 1 in a relatively good condition, and the liquid accumulation can be prevented from flowing back to the liquid accumulation state in the liquid inlet channel 1 or the relatively poor condition that the liquid accumulation is not good working state.

As shown in fig. 3 to 7, one end of the communication channel 101b extends to a position opposite to the liquid discharge one-way valve 4, so that when the diaphragm plunger pump is in a non-working state and the liquid level in the communication channel 101b is consistent with the liquid level in the pump liquid cavity 102a, the pressure on both sides of the liquid discharge one-way valve 4 is equal, and the liquid discharge one-way valve 4 is prevented from moving to jack up the non-return diaphragm 6 to open the liquid discharge flow channel 1 b.

As shown in fig. 2, 4 to 6 and 9, the pump body 1 has a communicating pipe 102b located in the pump chamber 102a, the cross section of the communicating pipe 102b is arc-shaped, so that the liquid in the pump chamber 102a can directly enter from the lateral opening of the arc-shaped communicating pipe 102b into the interior, the communicating pipe 102b passes through a liquid return hole 601 on the non-return diaphragm 6 to the communicating channel 101b to communicate with the communicating channel 101b, and based on the above arrangement, the communicating pipe 102b is utilized to make the effusion flow directionally, so as to ensure that the effusion in the liquid inlet channel 1a can be accurately guided into the communicating channel 101b of the pressure boosting cavity 101 a.

As shown in fig. 3, 4 and 6, a pagoda spring 7 opposite to the liquid discharge one-way valve 4 is arranged in the boost cavity 101a, two ends of the pagoda spring 7 are respectively abutted against the non-return diaphragm 6 and the inner wall of the boost cavity 101a, and based on the arrangement, the elastic force of the pagoda spring 7 is directly acted on the non-return diaphragm 6, so that the pressure of the non-return diaphragm 6 on the side close to the boost cavity 101a is higher than the pressure of the non-return diaphragm on the side close to the pump liquid cavity 102a, the free movement of the liquid discharge one-way valve 4 in the non-working state of the diaphragm pump is better avoided, and the overall tightness is further improved.

As shown in fig. 3, fig. 4, fig. 6 and fig. 8, a sinking groove 602 is formed on the non-return diaphragm 6, a certain empty space is formed between the sinking groove 602 and the inner wall of the boosting cavity 101a, the pagoda spring 7 is located in the empty space between the sinking groove 602 and the inner wall of the boosting cavity 101a, the pagoda spring 7 is ensured to be normally stored, a lower convex column 603 and an upper convex column 101c which are opposite are respectively formed on the bottom wall of the sinking groove 602 and the inner wall of the boosting cavity 101a, two ends of the pagoda spring 7 are respectively sleeved on the lower convex column 603 and the upper convex column 101c, the deformation direction of the pagoda spring 7 can be limited by the lower convex column 603 and the upper convex column 101c, the pagoda spring 7 is ensured to be always deformed along a straight line, the pagoda spring 7 is prevented from being distorted, and the service life of the pagoda spring is prolonged.

As shown in fig. 2 and 3, the liquid inlet check valve 3 and the liquid outlet check valve 4 are umbrella valves.

As shown in fig. 11, the plunger assembly includes an eccentric wheel 8 and a crankshaft 9, the eccentric wheel 8 is eccentrically connected with the output end of the motor 2, one end of the crankshaft 9 is connected with the diaphragm membrane 5, the other end forms a storage groove 901, the storage groove 901 is sleeved outside the eccentric wheel 8 through the storage groove 901, when the motor 2 operates, the output end drives the eccentric wheel 8 to eccentrically rotate, and the eccentric wheel 8 rotates to push and drive the crankshaft 9 to reciprocate back and forth, so that the diaphragm membrane 5 can be driven to reciprocate back and forth through the crankshaft 9, the change of the volume of the pump liquid cavity 102a is realized, and liquid feeding and pumping are performed.

As shown in fig. 11, the plunger assembly further includes a ball bearing 10, where the ball bearing 10 is disposed in the receiving groove 901 of the crankshaft 9 and is sleeved outside the eccentric wheel 8, and based on the arrangement of the ball bearing 10, the friction force applied to the crankshaft 9 during rotation of the eccentric wheel 8 can be reduced, so that the crankshaft 9 can swing more sensitively and reciprocally synchronously with the eccentric wheel 8.

As shown in fig. 1 to 6 and fig. 9 and 10, the pump body 1 includes a balance bin 101, a water inlet and outlet cover 102 and a base 103, the balance bin 101, the water inlet and outlet cover 102 and the base 103 are detachably connected, a liquid inlet pipe 102c and a liquid outlet pipe 102d are formed on the water inlet and outlet cover 102, a liquid inlet flow channel 1a and a liquid outlet flow channel 1b are formed in the water inlet and outlet cover 102 and are respectively communicated with inner pipe sections of the liquid inlet pipe 102c and the liquid outlet pipe 102d, it is understood that the liquid inlet flow channel 1a and the liquid outlet flow channel 1b are respectively formed by two parts, namely a water inlet end in the inner pipe sections of the liquid inlet pipe 102c and the liquid outlet pipe 102d and a part in the water inlet and outlet cover 102, the motor 2 is arranged on the base 103, and a mounting cavity 103a, a liquid pumping cavity 102a and a boosting cavity 101a are respectively formed in the base 103, the water inlet and outlet cover 102 and the balance bin 101.

As shown in fig. 1, the balance bin 101, the water inlet and outlet cover 102 and the base 103 are in threaded connection through bolts 11, and the pump body 1 can be quickly disassembled and assembled in a detachable connection mode, so that the assembly and subsequent maintenance efficiency is improved.

In combination with figures 1 to 11, when the diaphragm plunger pump of the utility model works, the motor 2 operates to drive the eccentric wheel 8 of the plunger assembly to eccentrically rotate, the eccentric wheel 8 is pushed to drive the crank shaft 9 to reciprocally swing back and forth when rotating, and then the crank shaft 9 can drive the diaphragm membrane 5 to reciprocally stretch back and forth, when the diaphragm membrane 5 stretches back and forth, the volume of the pump liquid cavity 102a expands, negative pressure is generated in the pump liquid cavity, the liquid inlet check valve 3 conducts the liquid inlet channel 1a, liquid is sucked into the pump liquid cavity 102a from the liquid inlet pipe 102c of the water inlet and outlet cover 102 of the pump body 1, when the diaphragm membrane 5 stretches forward, the volume of the pump liquid cavity 102a contracts, the liquid pressure generated by the liquid pressure enables the liquid outlet check valve 4 and the liquid inlet check valve 3 to move, the liquid inlet channel 1a is closed again, the liquid outlet check valve 4 jacks up the non-return membrane 6, the pagoda spring 7 compresses, the liquid outlet channel 1b opens, when the pressure of the liquid is reduced, the elastic force of the pagoda spring 7 and the elastic force of the non-return diaphragm 6 push the liquid discharge one-way valve 4 to the original position, the liquid discharge flow channel 1b is closed again to carry out liquid feeding and pumping of the next side, when the diaphragm plunger pump is in a non-working state, if liquid accumulation exists in the water inlet end of the liquid inlet flow channel 1a, the liquid inlet one-way valve 3 enables the liquid inlet flow channel 1a to be conducted under the action of the liquid pressure, the liquid accumulation enters the communication channel 101b through the liquid pump cavity 102a, the rest part of the liquid inlet flow channel 1a and the liquid return hole 601 of the non-return diaphragm 6 until the liquid level in the communication channel 101b is consistent with the liquid level in the liquid pump cavity 102a, at the moment, the pressure on two sides of the non-return diaphragm 6 on the same level is equal, the liquid discharge one-way valve 4 cannot move under the action of the liquid pressure in the liquid pumping cavity 102a, so that the non-return diaphragm 6 is jacked up to open the liquid discharge flow channel 1b, and the diaphragm plunger pump of the utility model is prevented from leaking.

The foregoing embodiments and description have been provided merely to illustrate the principles and best modes of carrying out the utility model, and various changes and modifications can be made therein without departing from the spirit and scope of the utility model as defined in the appended claims.

Claims (10)

1. The utility model provides a two-way non-return diaphragm plunger pump, it includes pump body (1), motor (2), and locates feed liquor check valve (3), flowing back check valve (4), diaphragm membrane (5), plunger subassembly in pump body (1) installation cavity (103 a), motor (2) are located on pump body (1), and its output link up in installation cavity (103 a) to pump body (1) with the plunger subassembly be connected, plunger subassembly and diaphragm membrane (5) are connected to extend to in pump liquid chamber (102 a), feed liquor check valve (3), flowing back check valve (4) are located respectively in feed liquor runner (1 a) and flowing back runner (1 b) of pump body (1), characterized in that still be formed with in pump body (1) and step up chamber (101 a), step up chamber (101 a) and feed liquor runner (1 a) intercommunication, be equipped with in step up chamber (101 a) and non-return membrane (6), step up chamber (1 b) have and seal up chamber (1 a) and fluid passageway (101 a) and fluid return passageway (101 b) are opened in relative pump body (101 a).

2. A bi-directional non-return diaphragm plunger pump in accordance with claim 1 wherein one end of said communication channel (101 b) extends to a position opposite the drain check valve (4).

3. The bi-directional non-return diaphragm plunger pump according to claim 1, wherein the pump body (1) has a communicating pipe (102 b) located in the pump liquid chamber (102 a), the cross section of the communicating pipe (102 b) is arc-shaped, and the communicating pipe (102 b) passes through a liquid return hole (601) on the non-return diaphragm (6) to be communicated with the communicating channel (101 b) in the communicating channel (101 b).

4. The bidirectional non-return diaphragm plunger pump according to claim 1, wherein a pagoda spring (7) opposite to the liquid discharge one-way valve (4) is arranged in the pressure boosting cavity (101 a), and two ends of the pagoda spring (7) are respectively abutted against the non-return diaphragm (6) and the inner wall of the pressure boosting cavity (101 a).

5. The bi-directional non-return diaphragm plunger pump in accordance with claim 4, wherein a sinking groove (602) for accommodating a pagoda spring (7) is formed on the non-return diaphragm (6), a lower convex column (603) and an upper convex column (101 c) which are opposite are respectively formed on the bottom wall of the sinking groove (602) and the inner wall of the pressure boosting cavity (101 a), and two ends of the pagoda spring (7) are respectively sleeved on the lower convex column (603) and the upper convex column (101 c).

6. The bidirectional non-return diaphragm plunger pump according to claim 1, wherein the liquid inlet check valve (3) and the liquid outlet check valve (4) are umbrella valves.

7. The bi-directional non-return diaphragm plunger pump according to claim 1, wherein the plunger assembly comprises an eccentric wheel (8) and a crankshaft (9), the eccentric wheel (8) is eccentrically connected with the output end of the motor (2), one end of the crankshaft (9) is connected with the diaphragm membrane (5), and the other end forms a receiving groove (901), and the receiving groove (901) is sleeved outside the eccentric wheel (8).

8. The bi-directional non-return diaphragm plunger pump in accordance with claim 7 wherein said plunger assembly further comprises a ball bearing (10), said ball bearing (10) being disposed in a receiving groove (901) of the crankshaft (9) and being nested outside the eccentric (8).

9. The bidirectional non-return diaphragm plunger pump according to claim 1, wherein the pump body (1) comprises a balance bin (101), a water inlet and outlet cover (102) and a base (103), the balance bin (101), the water inlet and outlet cover (102) and the base (103) are detachably connected, a liquid inlet pipe (102 c) and a liquid outlet pipe (102 d) are formed on the water inlet and outlet cover (102), a liquid inlet flow channel (1 a) and a liquid outlet flow channel (1 b) are formed in the water inlet and outlet cover (102) and are respectively communicated with inner pipe sections of the liquid inlet pipe (102 c) and the liquid outlet pipe (102 d), the motor (2) is arranged on the base, and the installation cavity (103 a), the pump liquid cavity (102 a) and the pressure boosting cavity (101 a) are respectively formed in the base (103), the water inlet and outlet cover (102) and the balance bin (101).

10. The bi-directional non-return diaphragm plunger pump in accordance with claim 9 wherein said balance cartridge (101), access cover (102) and base (103) are threadably connected by bolts (11).