Hydraulic electric double-diaphragm pump

Abstract

The utility model provides a hydraulic type electric double-diaphragm pump which comprises a shell and a driving device, a middle body is arranged in the shell, the two ends of the middle body are connected with a left diaphragm and a right diaphragm respectively, a piston is installed in the middle body, the middle body is divided into a left hydraulic cavity and a right hydraulic cavity by the piston, and the left hydraulic cavity and the right hydraulic cavity are filled with hydraulic media. A left fluid cavity is formed between the left diaphragm and the shell, a right fluid cavity is formed between the right diaphragm and the shell, and the piston reciprocates left and right under the action of the driving device, so that the left fluid cavity and the right fluid cavity are extruded to alternately suck in and discharge liquid. According to the hydraulic type electric double-diaphragm pump, the fluid cavity is formed in one side of the diaphragm, the hydraulic cavity is formed in the other side of the diaphragm, fluid in the hydraulic cavity serves as a medium to push the diaphragm to move, the problem that stress on the two sides of the diaphragm of the electric double-diaphragm pump is unbalanced is solved, the service life of the diaphragm is prolonged, and the working pressure range of the electric double-diaphragm pump is widened. And the application field of the electric double-diaphragm pump is widened.

Description

Technical Field

[0001] The utility model belongs to the field of diaphragm pumps, in particular to a hydraulic electric double diaphragm pump. Background Art

[0002] The diaphragm pump is a common industrial pump that can be divided into many types. According to the driving mode, it can be divided into two types: pneumatic diaphragm pump and electric diaphragm pump. The pneumatic diaphragm pump uses compressed air as the power source, and the electric diaphragm pump uses a motor as the power source. The electric double diaphragm pump is widely used because of its strong self-priming ability and energy saving. The electric double diaphragm pump drives the eccentric crankshaft to rotate through the motor, and the eccentric crankshaft drives the connecting rod to reciprocate. Diaphragms are installed at both ends of the connecting rod, so that the two fluid chambers alternately suck in and discharge the liquid, thereby realizing the diaphragm pump to continuously suck and transport the liquid. During the pumping process, the side of the diaphragm located in the fluid chamber is under pressure (the pressure of the transported fluid), and the other side, except for the part in contact with the connecting rod, does not bear pressure. Therefore, the diaphragm is easily broken due to the unbalanced force on both sides, and its life is short. Since the diaphragm is under pressure on one side, when the pressure on one side is high, the diaphragm is easily damaged, so it cannot be adapted to occasions with high working pressure.

[0003] In addition, if the outlet valve of the electric double diaphragm pump is suddenly or accidentally closed, the delivered fluid cannot be discharged, and the motor continues to run, thereby continuing to drive the connecting rod to move, and the connecting rod continues to push the diaphragm to move, and the diaphragm will continue to generate thrust on the fluid, thereby forming high pressure in the fluid cavity, and the shell may rupture, causing personal injury. Or the motor rotation is blocked, the load becomes large, which may cause the motor to heat up or even burn out. Summary of the invention

[0004] The utility model aims at the technical problem that both sides of the diaphragm of the existing electric double diaphragm pump are prone to damage due to uneven force. An electric double diaphragm pump is proposed, in which one side of the diaphragm is a fluid cavity and the other side is a hydraulic cavity. The fluid in the hydraulic cavity is used as a medium to drive the diaphragm to move, thereby increasing the service life of the diaphragm.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A hydraulic electric double diaphragm pump comprises a shell and a driving device, wherein an intermediate body is arranged in the shell, and a left diaphragm and a right diaphragm are respectively connected to the two ends of the intermediate body, and a piston is installed in the intermediate body, and the piston divides the intermediate body into a left hydraulic chamber and a right hydraulic chamber, and the left hydraulic chamber and the right hydraulic chamber are filled with hydraulic medium; a left fluid chamber is formed between the left diaphragm and the shell, and a right fluid chamber is formed between the right diaphragm and the shell, and the piston reciprocates left and right under the action of the driving device, thereby squeezing the left fluid chamber and the right fluid chamber, so that they alternately suck in and discharge liquid.

[0007] Preferably, the driving device comprises an eccentric crankshaft, and a strip-shaped hole for accommodating the eccentric crankshaft is provided in the middle of the piston.

[0008] Preferably, guide rod accommodating grooves are provided on both sides of the piston, guide plates are provided on the tops of the guide rod accommodating grooves, and a left diaphragm guide rod is provided in the left hydraulic chamber; one end of the left diaphragm guide rod is connected to the left diaphragm, and the other end passes through the guide plate on the same side and an elastomer is provided between the guide plate; a right diaphragm guide rod is provided in the right hydraulic chamber, one end of the right diaphragm guide rod is connected to the right diaphragm, and the other end passes through the guide plate on the same side and an elastomer is provided between the guide plate.

[0009] Preferably, a left diaphragm guide rod and a left guide plate are arranged in the left hydraulic chamber, one end of the left diaphragm guide rod is connected to the left diaphragm, the other end passes through the left guide plate and an elastic body is arranged between the left guide plate; a right diaphragm guide rod and a right guide plate are arranged in the right hydraulic chamber, one end of the right diaphragm guide rod is connected to the right diaphragm, the other end passes through the right guide plate and an elastic body is arranged between the right guide plate

[0010] Preferably, clamping plates are provided on both sides of the left diaphragm and the right diaphragm, and the clamping plates are connected to the left diaphragm guide rod and the right diaphragm guide rod by screws.

[0011] Preferably, a piston sleeve is provided between the piston and the intermediate body.

[0012] Preferably, an oil supply mechanism is further included, wherein the oil supply mechanism includes an oil tank, and the left hydraulic chamber and the right hydraulic chamber are each connected to the oil tank via a one-way valve to supply oil to the left hydraulic chamber and the right hydraulic chamber.

[0013] Preferably, a pressure relief device is also included, which includes a pressure relief valve connected to the oil tank, and the left hydraulic chamber and the right hydraulic chamber are each connected to the pressure relief valve through a one-way valve or the left hydraulic chamber and the right hydraulic chamber are connected to the pressure relief valve through a shuttle valve to discharge the hydraulic medium under high pressure.

[0014] Preferably, the oil supply mechanism and the pressure relief mechanism are arranged outside the shell or inside the shell.

[0015] Preferably, a pump inlet and a pump outlet are provided on the outer shell, the pump inlet is connected to the left fluid cavity and the right fluid cavity through a suction pipe, the pump outlet is connected to the left fluid cavity and the right fluid cavity through a discharge pipe, and check balls and check ball seats are provided at the connections between the suction pipe and the discharge pipe and the left fluid cavity and the right fluid cavity.

[0016] Compared with the prior art, the advantages and positive effects of the utility model are:

[0017] The hydraulic electric double diaphragm pump has a fluid cavity on one side and a hydraulic cavity on the other side. The fluid in the hydraulic cavity is used as a medium to drive the diaphragm to move. One side of the diaphragm is subjected to the pressure of the conveyed fluid, and the other side is subjected to the pressure of the hydraulic oil. This avoids the problem of unbalanced force on both sides of the diaphragm of the electric double diaphragm pump. Therefore, the diaphragm will not rupture due to unbalanced force on both sides, thereby increasing the service life of the diaphragm, increasing the working pressure range of the electric double diaphragm pump, and broadening the application field of the electric double diaphragm pump.

[0018] The hydraulic electric double diaphragm pump is provided with a pressure relief mechanism. When the outlet valve of the electric double diaphragm pump is suddenly closed or accidentally closed, when the hydraulic oil reaches the set pressure, it will be discharged into the hydraulic oil tank through the pressure relief valve, so that the diaphragm cannot continue to move and high pressure will not continue to be generated on the transported fluid, thereby protecting the pump casing and avoiding obstruction of the motor operation, and avoiding the occurrence of motor heating, burning and other phenomena. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the internal structure of the hydraulic electric double diaphragm pump of the utility model;

[0020] Figure 2 It is a schematic diagram of the left drainage state of the hydraulic electric double diaphragm pump of the utility model;

[0021] Figure 3 It is a schematic diagram of the right side drainage state of the hydraulic electric double diaphragm pump of the utility model;

[0022] Figure 4 Another structural schematic diagram of the hydraulic electric double diaphragm pump of the utility model;

[0023] In the above figures: 1. housing; 2. left end cover; 3. right end cover; 4. pump inlet; 5. pump outlet; 6. intermediate body; 7. left diaphragm; 8. right diaphragm; 9. piston; 10. piston sleeve; 11. left hydraulic chamber; 12. right hydraulic chamber; 13. eccentric crankshaft; 14. strip hole; 15. left fluid chamber; 16. right fluid chamber; 17. suction pipe; 18. discharge pipe; 19. check ball seat; 20. check ball; 21. guide rod receiving groove; 22. left guide plate; 23. through hole; 24. left diaphragm guide rod; 25. stopper; 26. return spring; 27. right diaphragm guide rod; 28. right guide plate; 29. ​​oil tank; 30. pressure relief valve; 31. first one-way valve; 32. second one-way valve; 33. third one-way valve; 34. fourth one-way valve; 35. clamping plate. DETAILED DESCRIPTION

[0024] In order to better understand the present invention, a detailed description is given below in conjunction with the accompanying drawings and embodiments.

[0025] Example: Figure 1-Figure 3As shown, a hydraulic electric double diaphragm pump comprises a housing 1 and a driving device. The left and right sides of the housing 1 are respectively provided with a left end cover 2 and a right end cover 3. The housing 1 is provided with a pump inlet 4 and a pump outlet 5. An intermediate body 6 is provided in the housing 1. The two ends of the intermediate body 6 are respectively connected to a left diaphragm 7 and a right diaphragm 8. A piston 9 is installed in the intermediate body 6. Two piston sleeves 10 are provided on the inner wall of the intermediate body 6. The piston 9 divides the intermediate body 6 into a closed left hydraulic chamber 11 and a right hydraulic chamber 12. The left hydraulic chamber 11 and the right hydraulic chamber 12 are filled with hydraulic medium. In this embodiment, hydraulic oil is selected. Of course, other liquids can also be selected. The intermediate body 6 can be formed integrally with the pump housing 1, or it can be set as an independent component and installed inside the pump housing 1 by screws or the like. The driving device comprises a motor. An eccentric crankshaft 13 is connected to the output shaft of the motor. A strip hole 14 for accommodating the eccentric crankshaft 13 is provided in the middle of the piston 9. When the motor rotates, the eccentric crankshaft 13 drives the piston 9 to reciprocate left and right.

[0026] A left fluid chamber 15 is formed between the left diaphragm 7 and the housing 1, and a right fluid chamber 16 is formed between the right diaphragm 8 and the housing 1. A pump inlet 4 and a pump outlet 5 are provided on the housing 1. The pump inlet 4 is connected to the left fluid chamber 15 and the right fluid chamber 16 respectively through two suction pipes 17. The pump outlet 5 is connected to the left fluid chamber 15 and the right fluid chamber 16 through two discharge pipes 18. Check ball seats 19 are provided at the connection between the suction pipe 17 and the discharge pipe 18 and the left fluid chamber 15 and the right fluid chamber 16. A check ball 20 is installed on the check ball seat 19. When the piston 9 reciprocates left and right under the action of the driving device, the hydraulic oil in the left hydraulic chamber 11 and the right hydraulic chamber 12 squeezes the left diaphragm 7 or the right diaphragm 8, so that the left fluid chamber 15 and the right fluid chamber 16 alternately suck in and discharge liquid.

[0027] The piston 9 is provided with guide rod receiving grooves 21 on both sides, and a left guide plate 22 is provided at the notch of the left guide rod receiving groove 21, and a through hole 23 is provided on the left guide plate 22. A left diaphragm guide rod 24 is provided in the left hydraulic chamber 11, one end of the left diaphragm guide rod 24 is connected to the left diaphragm 7, and the other end passes through the left guide plate 22 from the through hole 23, and a stopper 25 is provided at the right end of the left diaphragm guide rod 24, and a return spring 26 is provided between the stopper 25 and the left guide plate 22. Since the left guide rod can slide in the through hole 23 of the left guide plate 22, when the piston 9 moves from the leftmost side to the middle, the left guide plate 22 drives the left diaphragm guide rod 24 to move to the right through the return spring 26, so that the left diaphragm is quickly reset. Similarly, a right diaphragm guide rod 27 is provided in the right hydraulic chamber 12, one end of the right diaphragm guide rod 27 is connected to the right diaphragm 8, and the other end passes through the right guide plate 28, and a return spring 26 is provided between the right guide plate 28. In order to facilitate the connection between the diaphragm and the diaphragm guide rod and increase the service life of the diaphragm, a clamping plate 35 is provided on both sides of the left diaphragm 7 and the right diaphragm 8, and the clamping plate 35 is connected to the left diaphragm guide rod 24 and the right diaphragm guide rod 27 by screws. The installation position of the left guide plate 22 and the right guide plate 28 is not limited to being set on the piston 9, and can also be set on the intermediate body 6 (such as Figure 4 ), as long as the left diaphragm guide rod 24 can drive the left diaphragm 7 and the right diaphragm guide rod 27 can drive the right diaphragm 8 to reset through the reset spring 26.

[0028] In order to facilitate filling the left hydraulic chamber 11 and the right hydraulic chamber 12 with hydraulic oil, an oil supply mechanism is also provided. The oil supply mechanism includes an oil tank 29. The left hydraulic chamber 11 is connected to the oil tank 29 via a first one-way valve 31, and the right hydraulic chamber 12 is connected to the oil tank 29 via a second one-way valve 32, so as to supply oil to the left hydraulic chamber 11 and the right hydraulic chamber 12.

[0029] In order to prevent the pump outlet 5 from closing suddenly and causing excessive pressure in the pump, a pressure relief device is provided. The pressure relief device includes a pressure relief valve 30 connected to the oil tank 29, the left hydraulic chamber 11 is connected to the pressure relief valve 30 through the third one-way valve 33, and the right hydraulic chamber 12 is connected to the pressure relief valve 30 through the fourth one-way valve 34. The left hydraulic chamber 11 and the right hydraulic chamber 12 can also be connected to a shuttle valve, and the shuttle valve is connected to the pressure relief valve 30 instead of the third one-way valve 33 and the fourth one-way valve 34. When the pressure of the hydraulic oil in any one of the left hydraulic chamber 11 and the right hydraulic chamber 12 exceeds the pressure set by the pressure relief valve 30, the hydraulic oil in the hydraulic chamber will be discharged into the oil tank 29 through the pressure relief valve 30 for pressure relief, thereby avoiding overpressure of the hydraulic oil in the two hydraulic chambers; thus, the diaphragm will not continue to move, and high pressure will not continue to be generated on the transported fluid, thereby protecting the pump housing, and avoiding obstruction of the motor operation, and avoiding the phenomenon of motor heating and burning.

[0030] The oil supply mechanism and the pressure relief mechanism can be arranged outside the housing 1, or can be integrated inside the housing 1, and can be flexibly arranged according to needs.

[0031] The hydraulic electric double diaphragm pump described in this embodiment has a fluid cavity on one side of the diaphragm and a hydraulic cavity on the other side. The fluid in the hydraulic cavity is used as a medium to drive the movement of the diaphragm. One side of the diaphragm is subjected to the pressure of the transported fluid, and the other side is subjected to the pressure of the hydraulic oil. This avoids the problem of unbalanced force on both sides of the diaphragm of the electric double diaphragm pump. Therefore, the diaphragm will not rupture due to unbalanced force on both sides, thereby increasing the service life of the diaphragm, and also increasing the working pressure range of the electric double diaphragm pump, thereby broadening the application field of the electric double diaphragm pump.

[0032] The hydraulic electric double diaphragm pump is provided with a pressure relief mechanism. When the outlet valve of the electric double diaphragm pump is suddenly closed or accidentally closed, when the hydraulic oil reaches the set pressure, it will be discharged into the hydraulic oil tank 29 through the pressure relief valve 30, so that the diaphragm cannot continue to move and high pressure will not continue to be generated on the transported fluid, thereby protecting the pump casing and avoiding obstruction of the motor operation, and avoiding the occurrence of motor heating, burning and the like.

[0033] The above description is only a preferred embodiment of the present invention and does not limit the present invention in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes and apply it to other fields. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A hydraulic electric double diaphragm pump, characterized in that: It includes a shell and a driving device, an intermediate body is arranged in the shell, and the two ends of the intermediate body are respectively connected to a left diaphragm and a right diaphragm, and a piston is installed in the intermediate body. The piston divides the intermediate body into a left hydraulic chamber and a right hydraulic chamber, and the left hydraulic chamber and the right hydraulic chamber are filled with hydraulic medium; a left fluid chamber is formed between the left diaphragm and the shell, and a right fluid chamber is formed between the right diaphragm and the shell. The piston reciprocates left and right under the action of the driving device, thereby squeezing the left fluid chamber and the right fluid chamber, so that they alternately suck in and discharge liquid.

2. The hydraulic electric double diaphragm pump according to claim 1, characterized in that: The driving device comprises an eccentric crankshaft, and a strip-shaped hole for accommodating the eccentric crankshaft is arranged in the middle of the piston.

3. The hydraulic electric double diaphragm pump according to claim 1, characterized in that: Guide rod accommodating grooves are provided on both sides of the piston, guide plates are provided on the tops of the guide rod accommodating grooves, and a left diaphragm guide rod is provided in the left hydraulic chamber; one end of the left diaphragm guide rod is connected to the left diaphragm, and the other end passes through the guide plate on the same side and an elastic body is provided between the guide plate; a right diaphragm guide rod is provided in the right hydraulic chamber, one end of the right diaphragm guide rod is connected to the right diaphragm, and the other end passes through the guide plate on the same side and an elastic body is provided between the guide plate.

4. The hydraulic electric double diaphragm pump according to claim 1, characterized in that: A left diaphragm guide rod and a left guide plate are arranged in the left hydraulic chamber, one end of the left diaphragm guide rod is connected to the left diaphragm, the other end passes through the left guide plate and an elastic body is arranged between the left guide plate; a right diaphragm guide rod and a right guide plate are arranged in the right hydraulic chamber, one end of the right diaphragm guide rod is connected to the right diaphragm, the other end passes through the right guide plate and an elastic body is arranged between the right guide plate.

5. The hydraulic electric double diaphragm pump according to claim 3 or 4, characterized in that: Clamps are arranged on both sides of the left diaphragm and the right diaphragm, and the clamps are connected with the left diaphragm guide rod and the right diaphragm guide rod through screws.

6. The hydraulic electric double diaphragm pump according to claim 1, characterized in that: A piston sleeve is arranged between the piston and the intermediate body.

7. The hydraulic electric double diaphragm pump according to claim 1, characterized in that: It also includes an oil supply mechanism, which includes an oil tank. The left hydraulic chamber and the right hydraulic chamber are each connected to the oil tank through a one-way valve to supply oil to the left hydraulic chamber and the right hydraulic chamber.

8. The hydraulic electric double diaphragm pump according to claim 7, characterized in that: It also includes a pressure relief device, which includes a pressure relief valve connected to the oil tank. The left hydraulic chamber and the right hydraulic chamber are each connected to the pressure relief valve through a one-way valve or the left hydraulic chamber and the right hydraulic chamber are connected to the pressure relief valve through a shuttle valve to discharge the hydraulic medium under high pressure.

9. The hydraulic electric double diaphragm pump according to claim 8, characterized in that: The oil supply mechanism and the pressure relief mechanism are arranged outside the shell or inside the shell.

10. The hydraulic electric double diaphragm pump according to claim 1, characterized in that: The shell is provided with a pump inlet and a pump outlet, the pump inlet is connected to the left fluid cavity and the right fluid cavity through a suction pipe, the pump outlet is connected to the left fluid cavity and the right fluid cavity through a discharge pipe, and check balls and check ball seats are provided at the connection between the suction pipe and the discharge pipe and the left fluid cavity and the right fluid cavity.

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