Medium-pressure grease pump with liquid level switch module

Abstract

The utility model relates to the technical field of grease pumps, in particular to a medium-pressure grease pump with a liquid level switch module, which comprises a pump body, the pump body is provided with an oil cylinder, a floating platform is slidably arranged in the oil cylinder, the top surface of the oil cylinder is covered with an oil tank cover, and the top surface of the oil tank cover is provided with a switch box. A liquid level switch module is arranged in the switch box and extends into the oil cylinder, and a connecting mechanism is arranged between the liquid level switch module and the floating platform. The oil pump has the effect of conveniently reminding the user to supplement oil into the oil pump in time.

Description

Technical Field

[0001] This application relates to the technical field of grease pumps, and particularly to a medium-pressure grease pump with a liquid level switch module. Background Art

[0002] An electric grease pump is a grease pump driven by a DC power supply. It makes the plunger reciprocate through a DC motor and mechanical transmission to continuously output grease. The electric grease pump is used to lubricate mechanical equipment such as injection molding machines, laser machines, and textile machines.

[0003] The invention patent with the publication number CN105465586A discloses an electric grease pump, which includes an oil storage barrel, a driving base, and a self-closing mechanism; an oil outlet hole is provided on the lower end surface of the oil storage barrel, and a self-closing mechanism is provided on the oil outlet hole for closing the oil outlet hole; an oil inlet hole is provided on the top surface of the driving base, and on the driving base, at the position of the oil inlet hole, there is a plane for abutting against the self-closing mechanism; the lower end of the oil storage barrel is detachably connected to the driving base, and the plane abuts against the self-closing mechanism to open the self-closing mechanism so that the oil outlet hole is connected to the oil inlet hole. There is no need to refuel from the bottom filling port position, so during the use process, the grease replenishment operation cannot be carried out efficiently due to the limitation of the assembly position or the use environment.

[0004] However, when the grease in the oil storage barrel is used up, the staff often cannot discover it in time, resulting in the failure to supply oil to the mechanical equipment in time and causing damage to the mechanical equipment. Utility Model Content

[0005] In order to facilitate reminding to replenish grease into the grease pump in time, this application provides a medium-pressure grease pump with a liquid level switch module.

[0006] A medium-pressure grease pump with a liquid level switch module provided by this application adopts the following technical solutions:

[0007] A medium-pressure grease pump with a liquid level switch module includes a pump body. The pump body is provided with an oil cylinder. A floating platform is slidably arranged in the oil cylinder. The top surface of the oil cylinder is covered with an oil tank cover. A switch box is arranged on the top surface of the oil tank cover. A liquid level switch module is arranged in the switch box. The liquid level switch module extends into the oil cylinder. A connecting mechanism is arranged between the liquid level switch module and the floating platform.

[0008] By adopting the above technical solution, the oil barrel is used to store grease. When the pump body operates to use oil, the grease is output from the output end of the pump body, and the liquid level of the grease in the oil barrel drops. The floating platform drops with the drop of the liquid level. Since the floating platform is connected to the liquid level switch module through a connecting mechanism, when the grease is used up, the floating platform triggers the liquid level switch module through the connecting mechanism, and the liquid level switch module disconnects, thereby reminding that the grease has been used up and needs to be refilled, which is beneficial to improving the convenience of reminding to replenish the grease in the grease pump in time.

[0009] Optionally, the connecting mechanism includes a chain. The liquid level switch module is provided with a first connecting rod, which extends into the oil barrel. A screw seat is arranged on the top surface of the floating platform, and a second connecting rod is threadedly arranged on the top surface of the screw seat. The oil barrel is provided with a first fixing component and a second fixing component. One end of the chain is connected to the first connecting rod through the first fixing component, and the other end of the chain is connected to the second connecting rod through the second fixing component.

[0010] By adopting the above technical solution, under the action of the first fixing component and the second fixing component, the chain is fixedly connected to the floating platform and the liquid level switch module respectively. When the liquid level of the grease in the oil barrel drops, the floating platform drops with the drop of the grease liquid level. At this time, the chain unfolds. When the grease liquid level drops to the lowest liquid level height, the chain is tightened at this time and triggers the liquid level switch module to disconnect, which is beneficial to improving the stability of triggering the opening and closing of the liquid level switch module.

[0011] Optionally, the first fixing component includes a first chain buckle, a first screw and a first nut. The first chain buckle clamps the first connecting rod. One end of the chain is fixedly connected to the first chain buckle. The first screw sequentially penetrates through the first chain buckle and the first connecting rod, and the first nut is threadedly connected to the first screw.

[0012] By adopting the above technical solution, when one end of the chain needs to be fixed to the first connecting rod, first fixedly connect one end of the chain to the first chain buckle, then clamp the first chain buckle on the first connecting rod, then sequentially penetrate the first screw through the first chain buckle and the first connecting rod, and finally threadedly tighten the first nut. At this time, the chain is fixedly connected to the first connecting rod through the first chain buckle, which is beneficial to improving the stability of the connection and fixation between the chain and the liquid level switch module.

[0013] Optionally, the second fixing component includes a second chain buckle, a second screw and a second nut. The second chain buckle clamps the second connecting rod. One end of the chain is fixedly connected to the second chain buckle. The second screw sequentially penetrates through the second chain buckle and the second connecting rod, and the second nut is threadedly connected to the second screw.

[0014] By adopting the above technical solution, when one end of the chain needs to be fixed to the second connecting rod, first fixedly connect one end of the chain to the second chain link, then clamp the second chain link on the second connecting rod, then sequentially penetrate the second screw through the second chain link and the second connecting rod, and finally tighten the second nut. At this time, the chain is fixedly connected to the second connecting rod through the second chain link, which is beneficial to improving the stability of the connection and fixation between the chain and the floating platform.

[0015] Optionally, the liquid level switch module includes a microswitch device and a liquid level switch device. The microswitch device is arranged in the switch box, the liquid level switch device is arranged in the fuel tank cap, one end of the liquid level switch device is provided with a pressing rod, the pressing rod abuts against the opening and closing end of the microswitch device, and the first connecting rod is arranged at the other end of the liquid level switch device.

[0016] By adopting the above technical solution, when the floating platform descends and the chain is tensioned, the chain pulls the first connecting rod downward. The first connecting rod pulls the pressing rod downward through the liquid level switch device. At this time, the pressing rod disengages from the microswitch device, and the microswitch device thus disconnects, which is beneficial to improving the stability of the opening and closing of the liquid level switch module with the change of the grease liquid level height.

[0017] Optionally, the liquid level switch device includes a switch cylinder arranged in the fuel tank cap. An adjusting rod is slidably arranged in the switch cylinder. A first spring is sleeved on the side wall of the adjusting rod. One end of the first spring is connected to the side wall of the adjusting rod, and the other end of the first spring is connected to the inner bottom wall of the switch cylinder. Both ends of the adjusting rod extend outside the switch cylinder. One end of the adjusting rod is fixedly connected to the pressing rod, and the other end of the adjusting rod is fixedly connected to the first connecting rod.

[0018] By adopting the above technical solution, when the chain pulls the first connecting rod downward, the first connecting rod drives the adjusting rod to move downward, the adjusting rod drives the pressing rod to move downward, and at the same time the adjusting rod compresses the first spring. When the floating platform moves upward and the chain relaxes, the first spring releases elastic force and drives the pressing rod to move upward through the adjusting rod, and the pressing rod thus abuts tightly against the opening and closing end of the microswitch device, which is beneficial to improving the stability of the opening and closing of the liquid level switch module with the change of the grease liquid level height.

[0019] Optionally, a second spring is arranged in the oil cylinder. One end of the second spring is connected to the top surface of the floating platform, and the other end of the second spring is connected to the inner side of the fuel tank cap.

[0020] By adopting the above technical solution, when replenishing grease into the oil barrel, the grease drives the floating platform to move upward, and the floating platform squeezes the second spring. When the grease liquid level drops, the second spring releases its elastic force and drives the floating platform to descend, which is beneficial to improving the stability of the floating platform rising and falling in the oil barrel along with the grease liquid level.

[0021] Optionally, an exhaust hole is provided on the side wall of the oil barrel.

[0022] By adopting the above technical solution, under the restriction of the second spring, when the floating platform rises to the upper limit, the grease liquid level is connected to the exhaust hole. At this time, the bubbles in the grease liquid level are discharged from the exhaust hole outside the oil barrel, which is beneficial to improving the convenience of discharging the grease bubbles outside the oil barrel.

[0023] In summary, the present application includes the following beneficial technical effects:

[0024] The oil barrel is used to store grease. When the pump body operates to use oil, the grease is output from the output end of the pump body, and the liquid level of the grease in the oil barrel drops, and the floating platform drops along with the drop of the liquid level. Since the floating platform is connected to the liquid level switch module through the connecting mechanism, when the grease is used up, the floating platform triggers the liquid level switch module through the connecting mechanism, and the liquid level switch module disconnects, thereby reminding that the grease has been used up and needs to be refilled, which is beneficial to improving the convenience of reminding to replenish grease into the grease pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is the overall structural schematic diagram of the medium-pressure grease pump with a liquid level switch module of the present application;

[0026] Figure 2 is the overall structural schematic diagram of the floating platform of the present application;

[0027] Figure 3 is the installation structural schematic diagram of the liquid level switch module of the present application;

[0028] Figure 4 is the structural schematic diagram of the second fixing component of the present application;

[0029] Figure 5 is the structural schematic diagram of the liquid level switch device of the present application;

[0030] Figure 6 is the structural schematic diagram of the fuel tank cap, the second spring and the floating platform of the present application.

[0031] Description of reference numerals: 1. Pump body; 2. Oil cylinder; 3. Floating platform; 4. Fuel tank cap; 5. Switch box; 6. Liquid level switch module; 7. Chain; 8. First connecting rod; 9. Screw base; 10. Second connecting rod; 11. First chain link; 12. First screw; 13. First nut; 14. Second chain link; 15. Second screw; 16. Second nut; 17. Micro switch device; 18. Liquid level switch device; 19. Extrusion rod; 20. Switch cylinder; 21. Adjusting rod; 22. First spring; 23. Second spring; 24. Exhaust hole. Detailed implementation manners

[0032] The following further describes the present application in conjunction with the Figure 1-6 accompanying drawings.

[0033] Embodiment:

[0034] Refer to Figure 1 , Figure 2 and Figure 3 , a medium-pressure grease pump with a liquid level switch module, including a pump body 1. In this embodiment, the pump body 1 is a medium-pressure grease pump. The pump body 1 is fixedly installed with an oil cylinder 2, and grease is stored in the oil cylinder 2. A floating platform 3 is also slidably connected in the oil cylinder 2, and the floating platform 3 floats on the liquid surface of the grease. The top end of the oil cylinder 2 is fixedly covered with a fuel tank cap 4, and a switch box 5 is fixedly installed on the top surface of the fuel tank cap 4. A liquid level switch module 6 is installed in the switch box 5. Among them, the liquid level switch module 6 extends into the oil cylinder 2, and a connecting mechanism is installed between the liquid level switch module 6 and the floating platform 3. The floating platform 3 triggers the opening and closing of the liquid level switch module 6 through the connecting mechanism.

[0035] When the oil pump is in normal use, the pump body 1 pumps out the grease in the oil cylinder 2, and the liquid level of the grease in the oil cylinder 2 drops, and the floating platform 3 drops with the drop of the liquid level of the grease. Since the floating platform 3 is connected to the liquid level switch module 6 through the connecting mechanism, when the liquid level of the grease drops to the lowest liquid level height, the floating platform 3 triggers the liquid level switch module 6 to disconnect through the connecting mechanism, thereby reminding of the oil quantity state of the grease. When replenishing grease into the oil cylinder 2 through the pump body 1, the grease drives the floating platform 3 to rise. At this time, the liquid level switch module 6 is in a normally closed state, thereby reminding that the grease oil quantity is sufficient.

[0036] Specifically, refer to Figure 2 and Figure 3, the connecting mechanism includes a chain 7. A first connecting rod 8 is installed on the liquid level switch module 6, and the first connecting rod 8 is used to trigger the opening and closing of the liquid level switch module 6. The bottom end of the first connecting rod 8 penetrates through the fuel tank cap 4 and extends into the oil cylinder 2. The top surface of the floating platform 3 is concave, and a screw seat 9 is fixedly connected to the top surface of the floating platform 3, and a second connecting rod 10 is fixedly connected to the screw seat 9 by internal threads. A first fixing component and a second fixing component are also installed in the oil cylinder 2, and one end of the chain 7 is fixedly connected to the first connecting rod 8 through the first fixing component, and the other end of the chain 7 is fixedly connected to the second connecting rod 10 through the second fixing component.

[0037] Under the action of the first fixing component and the second fixing component, both ends of the chain 7 are fixedly connected to the liquid level switch module 6 and the floating platform 3 respectively. When the floating platform 3 rises with the grease liquid level, at this time the chain 7 is relaxed, and the liquid level switch module 6 is in the normally closed state. When the floating platform 3 drops with the grease liquid level, at this time the chain 7 is tensioned, and the chain 7 pulls the first connecting rod 8 downward, and the first connecting rod 8 triggers the liquid level switch module 6 to disconnect the liquid level switch module 6.

[0038] Specifically, refer to Figure 3 , the first fixing component includes a first chain link 11, a first screw 12 and a first nut 13. The first chain link 11 is U-shaped, and the first chain link 11 is clamped on the outer side wall of the first connecting rod 8. One end of the chain 7 is buckled with the first chain link 11, one end of the first screw 12 sequentially penetrates through the first chain link 11 and the first connecting rod 8 and extends outside the side wall of the first chain link 11, and the first nut 13 is threadedly connected to one end of the first screw 12.

[0039] When it is necessary to fix one end of the chain 7 to the first connecting rod 8, first buckle one end of the chain 7 on the first chain link 11, then clamp the first chain link 11 on the outer side wall of the first connecting rod 8, then sequentially penetrate the first screw 12 through the first chain link 11 and the first connecting rod 8, and finally threadedly tighten the first nut 13. At this time, one end of the chain 7 is fixed to the first connecting rod 8.

[0040] Specifically, refer to Figure 3 and Figure 4 , the second fixing component includes a second chain link 14, a second screw 15 and a second nut 16. The second chain link 14 is also U-shaped, and the second chain link 14 is clamped on the outer side wall of the second connecting rod 10. The other end of the chain 7 is buckled with the second chain link 14, one end of the second screw 15 sequentially penetrates through the second chain link 14 and the second connecting rod 10 and extends outside the side wall of the second chain link 14, and the second nut 16 is threadedly connected to one end of the second screw 15.

[0041] When it is necessary to fix the other end of the chain 7 to the second connecting rod 10, first buckle the other end of the chain 7 onto the second chain link 14, then clamp the second chain link 14 on the outer side wall of the second connecting rod 10, then sequentially penetrate the second screw 15 through the second chain link 14 and the second connecting rod 10, and finally thread-tighten the second nut 16. At this time, the other end of the chain 7 is fixed to the second connecting rod 10.

[0042] See Figure 3 , to improve the stability of the liquid level switch module 6 for opening and closing with the change of the oil consumption, the liquid level switch module 6 includes a micro switch device 17 and a liquid level switch device 18. In this embodiment, the micro switch device 17 is a WS1 type micro switch, and the micro switch device 17 is fixedly installed in the switch box 5. The liquid level switch device 18 is fixedly embedded in the fuel tank cap 4. A pressing rod 19 is movably installed at the top end of the liquid level switch device 18, and the pressing rod 19 abuts against the opening and closing end of the micro switch device 17. The first connecting rod 8 is movably installed at the bottom end of the liquid level switch device 18.

[0043] It should be noted that see Figure 3 and Figure 5 , to facilitate driving the pressing rod 19 to move, the liquid level switch device 18 includes a switch cylinder 20. The switch cylinder 20 is fixed in the fuel tank cap 4. An adjusting rod 21 is slidably connected in the switch cylinder 20. A first spring 22 is sleeved on the side wall of the adjusting rod 21, and one end of the first spring 22 is fixedly connected to the side wall of the adjusting rod 21, and the other end of the first spring 22 is fixedly connected to the inner bottom wall of the switch cylinder 20. Both ends of the adjusting rod 21 extend outside the switch cylinder 20. The top end of the adjusting rod 21 is fixedly connected to the pressing rod 19, and the bottom end of the adjusting rod 21 is fixedly connected to the first connecting rod 8.

[0044] When the floating platform 3 descends and tightens the chain 7, when the floating platform 3 continues to descend and drives the first connecting rod 8 to descend through the chain 7, the first connecting rod 8 drives the adjusting rod 21 to descend, the adjusting rod 21 drives the pressing rod 19 to descend, and the adjusting rod 21 simultaneously compresses the first spring 22. When the pressing rod 19 descends, the pressing rod 19 disengages from the opening and closing end of the micro switch device 17. At this time, the micro switch device 17 is disconnected, reminding that grease needs to be replenished.

[0045] When the floating platform 3 rises and relaxes the chain 7, the first spring 22 releases elastic force and drives the pressing rod 19 to rise through the adjusting rod 21. The pressing rod 19 re-abuts against the opening and closing end of the micro switch device 17. At this time, the micro switch device 17 is closed, reminding that the amount of grease in the oil cylinder 2 is sufficient.

[0046] See Figure 6, to cooperate with driving the floating platform 3 to float with the rise and fall of the grease liquid level, a second spring 23 is installed in the oil cylinder 2, and one end of the second spring 23 is fixedly connected to the top surface of the floating platform 3, and the other end of the second spring 23 is fixedly connected to the inner surface of the fuel tank cap 4.

[0047] When injecting grease into the oil cylinder 2, the grease drives the floating platform 3 to rise. At this time, the floating platform 3 squeezes the second spring 23. When the grease volume decreases, the second spring 23 releases elastic force, and the second spring 23 drives the floating platform 3 to descend and always squeezes the grease liquid level.

[0048] It is worth mentioning that, referring to Figure 1 , an exhaust hole 24 is provided on the side wall of the oil cylinder 2, and the exhaust hole 24 is located at the maximum upper limit stroke position of the floating platform 3.

[0049] Under the limiting action of the second spring 23, when the floating platform 3 rises to the maximum upper limit, at this time the grease liquid level is communicated with the exhaust hole 24, so that the bubbles in the grease liquid level are discharged out of the oil cylinder 2 through the exhaust hole 24.

[0050] It should be noted that, referring to Figure 1 , the fuel tank cap 4 and the switch box 5 are both fixedly installed by bolts, which is beneficial to improving the detachability of the fuel tank cap 4 and the switch box 5.

[0051] In addition, the oil cylinder 2 in this embodiment is made of transparent plastic material, which is beneficial to more intuitively observing the use situation of the grease.

[0052] The working principle of a medium-pressure grease pump with a liquid level switch module:

[0053] When it is necessary to use the liquid level switch module 6 to detect the grease volume in the oil cylinder 2, first buckle one end of the chain 7 on the first chain buckle 11, then clamp the first chain buckle 11 on the outer side wall of the first connecting rod 8, then sequentially penetrate the first chain buckle 11 and the first connecting rod 8 with the first screw 12, and finally thread-tighten the first nut 13. At this time, one end of the chain 7 is fixed to the first connecting rod 8.

[0054] Then when fixing the other end of the chain 7 to the second connecting rod 10, first buckle the other end of the chain 7 on the second chain buckle 14, then clamp the second chain buckle 14 on the outer side wall of the second connecting rod 10, then sequentially penetrate the second chain buckle 14 and the second connecting rod 10 with the second screw 15, and finally thread-tighten the second nut 16. At this time, the other end of the chain 7 is fixed to the second connecting rod 10.

[0055] Then, the floating platform 3 is slidably installed in the oil cylinder 2, and at the same time, the fuel tank cover 4 is closed. Then, grease is injected into the oil cylinder 2 through the pump body 1. The grease drives the floating platform 3 to rise. At this time, the floating platform 3 squeezes the second spring 23. After the grease injection is completed, the floating platform 3 rises at this time, and the chain 7 is relaxed. The first spring 22 releases elastic force and drives the pressing rod 19 to rise through the adjusting rod 21. The pressing rod 19 abuts against the opening and closing end of the microswitch device 17 again. At this time, the microswitch device 17 is closed, reminding that the amount of grease in the oil cylinder 2 is sufficient.

[0056] When the grease is pumped out to the lowest liquid level, the floating platform 3 drops as the grease liquid level drops. At this time, the chain 7 is tensioned. When the floating platform 3 continues to drop and drives the first connecting rod 8 to drop through the chain 7, the first connecting rod 8 drives the adjusting rod 21 to drop. The adjusting rod 21 drives the pressing rod 19 to drop, and at the same time, the adjusting rod 21 squeezes the first spring 22. Also, when the pressing rod 19 drops, the pressing rod 19 disengages from the opening and closing end of the microswitch device 17. At this time, the microswitch device 17 is disconnected, reminding that grease needs to be replenished.

[0057] In summary, the floating platform 3 activates the liquid level switch module 6 through the connecting mechanism, and the liquid level switch module 6 is disconnected, thereby reminding that the grease has been used up and needs to be refilled, which is beneficial to improving the convenience of reminding to replenish grease into the grease pump.

[0058] The above are all the preferred embodiments of this application. The protection scope of this application is not limited accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. A medium-pressure grease pump with a liquid level switch module, comprising a pump body (1), characterized in that: The pump body (1) is provided with an oil cylinder (2), a floating platform (3) is slidably provided in the oil cylinder (2), the top surface of the oil cylinder (2) is covered with an oil tank cover (4), the top surface of the oil tank cover (4) is provided with a switch box (5), a liquid level switch module (6) is provided in the switch box (5), the liquid level switch module (6) extends into the oil cylinder (2), and a connecting mechanism is provided between the liquid level switch module (6) and the floating platform (3); The connecting mechanism comprises a chain (7), the liquid level switch module (6) is provided with a first connecting rod (8), the first connecting rod (8) extends into the oil cylinder (2), the top surface of the floating platform (3) is provided with a screw seat (9), the top surface of the screw seat (9) is threadedly provided with a second connecting rod (10), the oil cylinder (2) is provided with a first fixing component and a second fixing component, one end of the chain (7) is connected to the first connecting rod (8) through the first fixing component, and the other end of the chain (7) is connected to the second connecting rod (10) through the second fixing component.

2. A medium-pressure grease pump with a liquid level switch module according to claim 1, characterized in that: The first fixing assembly comprises a first chain link (11), a first screw (12) and a first nut (13); the first chain link (11) is clamped on the first connecting rod (8); one end of the chain (7) is fixedly connected to the first chain link (11); the first screw (12) passes through the first chain link (11) and the first connecting rod (8) in sequence; and the first nut (13) is threadedly connected to the first screw (12).

3. A medium-pressure grease pump with a liquid level switch module according to claim 1, characterized in that: The second fixing assembly comprises a second chain link (14), a second screw (15) and a second nut (16); the second chain link (14) is clamped on the second connecting rod (10); one end of the chain (7) is fixedly connected to the second chain link (14); the second screw (15) passes through the second chain link (14) and the second connecting rod (10) in sequence; and the second nut (16) is threadedly connected to the second screw (15).

4. A medium-pressure grease pump with a liquid level switch module according to claim 1, characterized in that: The liquid level switch module (6) comprises a micro switch device (17) and a liquid level switch device (18), wherein the micro switch device (17) is arranged in the switch box (5), and the liquid level switch device (18) is arranged in the fuel tank cover (4). An extrusion rod (19) is arranged at one end of the liquid level switch device (18), and the extrusion rod (19) abuts against the opening and closing end of the micro switch device (17). The first connecting rod (8) is arranged at the other end of the liquid level switch device (18).

5. A medium-pressure grease pump with a liquid level switch module according to claim 4, characterized in that: The liquid level switch device (18) comprises a switch cylinder (20), wherein the switch cylinder (20) is arranged in the oil tank cover (4), an adjusting rod (21) is slidably arranged in the switch cylinder (20), a first spring (22) is sleeved on the side wall of the adjusting rod (21), one end of the first spring (22) is connected to the side wall of the adjusting rod (21), and the other end of the first spring (22) is connected to the inner bottom wall of the switch cylinder (20), two ends of the adjusting rod (21) respectively extend outside the switch cylinder (20), one end of the adjusting rod (21) is fixedly connected to the extrusion rod (19), and the other end of the adjusting rod (21) is fixedly connected to the first connecting rod (8).

6. A medium-pressure grease pump with a liquid level switch module according to claim 1, characterized in that: A second spring (23) is arranged in the oil cylinder (2), one end of the second spring (23) is connected to the top surface of the floating platform (3), and the other end of the second spring (23) is connected to the inner side of the oil tank cover (4).

7. The medium-pressure grease pump with a liquid level switch module according to claim 1, characterized in that: The side wall of the oil cylinder (2) is provided with an exhaust hole (24).

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