Solenoid pump with high efficiency output

Abstract

The present invention provides an electromagnetic pump with high efficiency output, which includes a coil assembly, a pump tube, an iron core, a reset spring, a liquid discharge control spring, a liquid inlet control spring, a liquid discharge rubber head, a liquid inlet rubber head and a self-priming structure. The two ends of the pump tube are respectively provided with a liquid inlet hole and a liquid outlet hole, the iron core is slidably arranged in the pump tube, the iron core is axially penetrated, the liquid discharge rubber head cooperates with the liquid discharge control spring to unidirectionally seal the liquid discharge hole, the liquid inlet rubber head cooperates with the liquid inlet control spring to unidirectionally seal the port at one end of the iron core, and a sealed cavity is formed between the iron core and the liquid discharge hole, and the liquid discharge rubber head and the liquid inlet rubber head are blocked at both ends of the sealed cavity in opposite water blocking directions. A push rod is provided at one end of the liquid inlet rubber head close to the sealed cavity, and the push rod squeezes the liquid discharge rubber head to move away from the sealed cavity. The electromagnetic pump with high efficiency output of the present invention is provided with a push rod on the liquid inlet rubber head. When the electromagnetic pump is started, the push rod rigidly squeezes the liquid discharge rubber head, so that the liquid discharge rubber head is easy to open and water is easily pumped out.

Description

Technical Field

[0001] The invention relates to the field of electromagnetic pumps, and in particular to an electromagnetic pump with high-efficiency output. Background Art

[0002] The existing electromagnetic pump technology, when working, relies on the pressure of the sealed chamber to push open the one-way structure of the liquid outlet rubber head to discharge water. The liquid outlet rubber head of the electromagnetic pump is in a static state when the pump is not working. Over time, the liquid outlet rubber head will adhere to other parts. The electromagnetic pump is generally a one-in-one-out structure. The air compression pressure generated by the internal sealed chamber of the electromagnetic pump cannot meet the normal water supply requirements. When the electromagnetic pump is started, water is not easy to enter the sealed chamber, and water cannot soak the liquid outlet rubber head. The compressed air pressure in the sealed chamber makes it difficult to open the liquid outlet rubber head, especially when there is a large air back pressure on the equipment connected to one end of the liquid outlet hole. The air back pressure will further compress the liquid outlet rubber head, making it difficult to pump water out.

[0003] Therefore, it is necessary to provide an electromagnetic pump with high output efficiency to solve the above technical problems. Summary of the invention

[0004] The invention provides an electromagnetic pump with high-efficiency output, so as to solve the problem that the liquid outlet rubber head of the electromagnetic pump in the prior art is difficult to open, thereby making it difficult to pump out water.

[0005] In order to solve the above technical problems, the technical solution of the present invention is: an electromagnetic pump with high efficiency output, which includes a coil assembly, a pump tube, an iron core, a return spring, a liquid outlet control spring, a liquid inlet control spring, a liquid outlet rubber head and a liquid inlet rubber head;

[0006] The two ends of the pump tube are respectively provided with a liquid inlet hole and a liquid outlet hole, the iron core is slidably arranged in the pump tube, the iron core is axially penetrated, the liquid outlet rubber head cooperates with the liquid outlet control spring to unidirectionally seal the liquid outlet hole, the liquid inlet rubber head cooperates with the liquid inlet control spring to unidirectionally seal the port at one end of the iron core, a sealed cavity is formed between the iron core and the liquid outlet hole, and the liquid outlet rubber head and the liquid inlet rubber head block the two ends of the sealed cavity in opposite water blocking directions;

[0007] Wherein, a push rod is arranged at one end of the liquid inlet rubber head close to the sealing cavity, and the push rod squeezes the liquid outlet rubber head to move away from the sealing cavity.

[0008] In the present invention, the ejector rod and the liquid inlet rubber head are an integrally formed structure.

[0009] Optionally, the push rod is detachably connected to one end of the liquid inlet rubber head.

[0010] Optionally, the ejector rod is eccentrically disposed relative to an axial center line of the liquid discharging rubber head.

[0011] In the present invention, the electromagnetic pump with high-efficiency output also includes a self-priming structure, which includes a branch pipe, a sealing head, a self-priming spring and a spring seat. The inside of the branch pipe is a liquid guide hole that penetrates axially, and the liquid guide hole connects the sealed cavity and the external space. The sealing head is movably arranged in the branch pipe to seal the liquid guide hole. The spring seat is connected to one end of the branch pipe away from the pump pipe, and the self-priming spring is arranged between the sealing head and the spring seat.

[0012] A slot is arranged on the periphery of one end of the liquid outlet of the pump tube, and a connecting hole for communicating with the self-priming structure is arranged on the pump tube, and the connecting hole is bent to avoid the slot.

[0013] In addition, the branch pipe is threadedly connected to the pump pipe, and a convex ring is provided on the outer periphery of one end of the branch pipe away from the pump pipe. The spring seat includes a connecting shaft and a snap-fit ​​portion, and a plurality of snap-fit ​​portions are distributed on the circumference of the connecting shaft. One end of the connecting shaft is sleeved in the branch pipe, and the snap-fit ​​portion is snap-fitted with the convex ring.

[0014] Furthermore, the two ends of the self-priming spring are respectively sleeved with the sealing head and the connecting shaft, and the spring seat is provided with a connecting hole connecting the liquid guide hole and the external space. When the sealing head moves a set distance in a direction close to the spring seat, the sealing head seals the connecting hole.

[0015] In the present invention, one end of the sealing head is provided with a conical end portion for sealing the connecting hole, the inner wall surface of the connecting hole is provided with an inner conical surface adapted to the outer peripheral surface of the end portion, and the outer periphery of the other end of the sealing head is provided with a sliding contact protrusion for sliding contact with the inner wall surface of the branch pipe.

[0016] In the present invention, the branch pipe and the sealing head are both made of metal, the liquid guide hole is connected to the liquid inlet hole, and when the sealing head blocks the liquid guide hole and the liquid outlet rubber head seals the liquid outlet hole, the elastic force of the self-priming spring is greater than the elastic force of the liquid outlet control spring.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: the electromagnetic pump with high-efficiency output of the present invention is provided with a push rod on the liquid inlet rubber head. When the electromagnetic pump is started, the push rod can rigidly squeeze the liquid outlet rubber head, so that the liquid outlet rubber head is easy to open and water is easily pumped out. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. The drawings described below are only drawings corresponding to some embodiments of the present invention.

[0019] Figure 1It is a schematic structural diagram of the first embodiment of the electromagnetic pump with high-efficiency output of the present invention.

[0020] Figure 2 It is a schematic diagram of a second implementation structure of the water inlet rubber head and the ejector rod of the electromagnetic pump with high-efficiency output of the first embodiment.

[0021] Figure 3 It is a schematic diagram of a third implementation structure of the water inlet rubber head and the ejector rod of the electromagnetic pump with high-efficiency output of the first embodiment.

[0022] Figure 4 It is a schematic structural diagram of the first embodiment of the electromagnetic pump with high-efficiency output of the present invention.

[0023] Figure 5 A cross-sectional view of the self-priming structure of the electromagnetic pump with high output according to the second embodiment.

[0024] Figure 6 An exploded view of the self-priming structure of the electromagnetic pump with high output in the second embodiment. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0026] The directional terms mentioned in the present invention, such as "up", "down", "front", "back", "left", "right", "inside", "outside", "side", "top" and "bottom", are only for reference to the orientation of the drawings. The directional terms used are used to illustrate and understand the present invention, but not to limit the present invention.

[0027] The terms "first", "second", etc. in the present invention are used for descriptive purposes only and should not be understood as indicating or implying relative importance, and should not be used as a limitation on the order of precedence.

[0028] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense. For example, the connection can be a detachable connection or a connection of an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] The liquid outlet rubber head of the electromagnetic pump in the prior art is in a static state when the pump is not working. Over time, the liquid outlet rubber head will adhere to other parts. The electromagnetic pump generally has an inlet and outlet structure. The air compression pressure generated by the internal sealing chamber of the electromagnetic pump cannot meet the normal water supply requirements. When the electromagnetic pump is started, water is not easy to enter the sealing chamber, and water cannot soak the liquid outlet rubber head. The compressed air pressure in the sealing chamber makes it difficult to open the liquid outlet rubber head, especially when there is a large air back pressure on the equipment connected to one end of the liquid outlet hole. The air back pressure will further compress the liquid outlet rubber head, making it difficult to pump out water.

[0030] The following is a first embodiment of an electromagnetic pump with high efficiency output provided by the present invention that can solve the above technical problems.

[0031] Please refer to Figure 1 ,in Figure 1 It is a schematic structural diagram of the first embodiment of the electromagnetic pump with high-efficiency output of the present invention.

[0032] In the figures, structurally similar elements are denoted by the same reference numerals.

[0033] The present invention provides an electromagnetic pump with high efficiency output, which includes a coil assembly 11, a pump tube 13, an iron core 12, a return spring 14, a liquid outlet control spring 18, a liquid inlet control spring 17, a liquid outlet rubber head 16 and a liquid inlet rubber head 15.

[0034] A liquid inlet and a liquid outlet are respectively provided at both ends of the pump tube 13. The iron core 12 is slidably arranged in the pump tube 13. The iron core 12 is axially penetrated. The liquid outlet rubber head 16 cooperates with the liquid outlet control spring 18 to unidirectionally seal the liquid outlet hole. The liquid inlet rubber head 15 cooperates with the liquid inlet control spring 17 to unidirectionally seal the port at one end of the iron core 12. A sealed cavity 131 is formed between the iron core 12 and the liquid outlet hole. The liquid outlet rubber head 16 and the liquid inlet rubber head 15 block the two ends of the sealed cavity 131 in opposite water-blocking directions.

[0035] Among them, a push rod 151 is provided at one end of the liquid inlet rubber head 15 close to the sealing cavity 131, and the push rod 151 squeezes the liquid outlet rubber head 16 to move away from the sealing cavity 131. When the electromagnetic pump is started, the push rod 151 rigidly squeezes the liquid outlet rubber head 16, so that the liquid outlet rubber head 16 can overcome the adhesion resistance and open easily, and the water can be easily pumped out. When the liquid outlet rubber head 16 is no longer adhered to other parts, the push rod 151 moves in the direction close to the liquid outlet rubber head 16, and the liquid outlet rubber head 16 will gradually open. Therefore, in this case, the push rod 151 will not affect the normal operation of the liquid outlet rubber head 16.

[0036] like Figure 1 In this embodiment, the push rod 151 and the liquid inlet rubber head 15 are an integrally formed structure.

[0037] Optional, such as Figure 2The ejector rod 151 is detachably connected to one end of the liquid inlet rubber head 15. For example, the two can be connected by threaded connection, so that the ejector rod is easy to remove and replace.

[0038] Optional, such as Figure 3 The push rod 151 is eccentrically arranged compared to the axial center line of the liquid outlet rubber head 16, so that the push rod 151 can more easily squeeze the liquid outlet rubber head 16 to move, so that the liquid outlet rubber head 16 is disconnected from the pump tube.

[0039] The following is a second embodiment of an electromagnetic pump with high efficiency output that can solve the above technical problems provided by the present invention. The main difference between this embodiment and the first embodiment is that a self-priming structure is added to the electromagnetic pump in this embodiment. It should also be noted that the self-priming structure alone can also solve the problem of adhesion between the liquid outlet rubber head and other parts. Since the elastic force of the spring will decrease after a certain period of use, the extrusion force of the push rod will also decrease accordingly. Therefore, the self-priming structure can also be used in conjunction with the push rod. This can ensure that the problem of adhesion of the liquid outlet rubber head and difficulty in pumping out water can be solved. In this embodiment, the same structure as the first embodiment uses the same number.

[0040] The present embodiment provides an electromagnetic pump with high efficiency output, which includes a coil assembly 11, a pump tube 13, an iron core 12, a return spring 14, a liquid outlet control spring 18, a liquid inlet control spring 17, a liquid outlet rubber head 16, a liquid inlet rubber head 15 and a self-priming structure 21.

[0041] A liquid inlet hole and a liquid outlet hole are respectively provided at both ends of the pump tube 13 (it can be understood that the pump tube 13 in this embodiment is a split structure, which is convenient for installing components inside), the iron core 12 is slidably arranged in the pump tube 13, the iron core 12 is axially penetrated, the liquid outlet rubber head 16 cooperates with the liquid outlet control spring 18 to unidirectionally seal the liquid outlet hole, and the liquid inlet rubber head 15 cooperates with the liquid inlet control spring 17 to unidirectionally seal the port at one end of the iron core 12, and a sealed cavity 131 is formed between the iron core 12 and the liquid outlet hole, and the liquid outlet rubber head 16 and the liquid inlet rubber head 15 block the two ends of the sealed cavity 131 in opposite water-blocking directions.

[0042] The end of the liquid inlet rubber head 15 close to the sealing cavity 131 is provided with a push rod 151 , and the push rod 151 squeezes the liquid outlet rubber head 16 to move away from the sealing cavity 131 .

[0043] The self-priming structure 21 includes a branch pipe 211 and a sealing head 212 . The branch pipe 211 has a liquid conducting hole 2111 extending axially therethrough. The liquid conducting hole 2111 connects the sealing cavity 131 and the external space. The sealing head 212 is movably disposed in the branch pipe 211 to seal the liquid conducting hole 2111 .

[0044] When the electromagnetic pump is started, the push rod 151 rigidly squeezes the liquid outlet rubber head 16, so that the liquid outlet rubber head 16 is easy to open and the water is easily pumped out. When the push rod 151 cannot squeeze the liquid outlet rubber head 16 to move, the air in the sealing cavity 131 can be discharged through the self-priming structure, so that water can easily enter the sealing cavity and soak the liquid outlet rubber head, so that the adhesion between the liquid outlet rubber head 16 and other parts is small, the liquid outlet rubber head 16 is easy to open, and the water is easily pumped out.

[0045] The self-priming structure 21 in this embodiment further includes a self-priming spring 213 and a spring seat 214. The spring seat 214 is connected to one end of the branch pipe 211 away from the pump pipe 13, and the self-priming spring 213 is arranged between the sealing head 212 and the spring seat 214. At the same time, it is convenient to disassemble and assemble, and replace and utilize parts.

[0046] Please refer to Figure 4 A card slot is arranged on the periphery of one end of the liquid outlet of the pump tube 13, and the card slot can be used to connect with the equipment at one end of the liquid outlet. A connecting hole 132 for communicating with the self-priming structure 21 is arranged on the pump tube, and the connecting hole 132 is bent to avoid the card slot.

[0047] The pump tube 13 is provided with a boss portion for threaded connection with the branch tube 211 , and an outer peripheral side of the boss portion is provided with an external thread.

[0048] Please refer to Figure 3 In the present embodiment, the branch pipe 211 is threadedly connected to the pump pipe 13, and a convex ring 2112 is arranged on the outer periphery of one end of the branch pipe 211 away from the pump pipe 13. The spring seat 214 comprises a connecting shaft 2141 and a snap-fit ​​portion 2142. A plurality of snap-fit ​​portions 2142 are distributed on the circumferential side of the connecting shaft 2141. One end of the connecting shaft 2141 is sleeved in the branch pipe 211, and the snap-fit ​​portion 2142 is snap-fitted with the convex ring 2112, so that the connection is convenient.

[0049] Please refer to Figure 2 The two ends of the self-priming spring 213 in this embodiment are respectively sleeved with the sealing head 212 and the connecting shaft 2141. The spring seat 214 is provided with a connecting hole 2143 connecting the liquid guide hole 2111 and the external space. When the sealing head 212 moves a set distance in the direction close to the spring seat 211, the sealing head 212 seals the connecting hole 2143. That is, when the water pressure is large, the water pressure can compress the sealing head 212 to seal the connecting hole 2143, so that the branch pipe 211 no longer outputs water. The set distance in this embodiment is between 0.5-3mm, and a smaller set distance can be set to allow air leakage but not easy water leakage.

[0050] A conical end portion for sealing the communicating hole 2143 is provided at one end of the sealing head 212 , and an inner conical surface adapted to the outer peripheral surface of the end portion is provided on the inner wall surface of the communicating hole 2143 .

[0051] In addition, the outer periphery of the other end of the sealing head 212 can be provided with a sliding protrusion (the sliding protrusion is not shown in the figure) for sliding contact with the inner wall surface of the branch pipe, so that the sealing head 212 can stably slide along the axial direction inside the branch pipe 211, is not easy to shake, and is more stable.

[0052] In this embodiment, the branch pipe 211 and the sealing head 212 are both made of metal and are not prone to adhesion. The liquid guide hole 2111 can be connected to the liquid inlet hole, so that when the liquid guide hole 2111 leaks, the water is discharged to one end of the liquid inlet hole. When the sealing head 212 blocks the liquid guide hole 2111 and the liquid outlet rubber head 16 seals the liquid outlet hole, the elastic force of the self-priming spring 213 is greater than the elastic force of the liquid outlet control spring 18, so that when the water pressure is small, water is also more easily discharged through the liquid outlet hole, so that the branch pipe 211 no longer outputs water. It can be understood that when the liquid outlet rubber head 16 is adhered to the pump tube 13, the adhesion force plus the elastic force of the liquid outlet control spring 18 is greater than the elastic force of the self-priming spring 213, and it is difficult to squeeze the liquid outlet rubber head 16 open.

[0053] Optionally, the spring seat 214 can also be configured to be threadedly connected to the branch pipe 211, so that the elastic extrusion force of the self-priming spring 213 on the sealing head 212 can be conveniently adjusted by screwing the spring seat 214. However, the disadvantage of the threaded connection compared to the snap connection is that it requires more turns to form a certain degree of connection between the spring seat 214 and the branch pipe 211, and it is not so convenient to disassemble and assemble.

[0054] The working principle of the electromagnetic pump with high efficiency output of the present invention is as follows: the coil assembly 11 generates a magnetic field when energized, and the iron core 12 is affected by the magnetic force and moves to Figure 1 The left end in the azimuth moves to compress the return spring 14 . During this process, the volume of the sealed chamber 131 will increase, the pressure will decrease, and the liquid inlet rubber head 15 will be easily opened to balance the pressure of the sealed chamber 131 .

[0055] Then, due to the use of alternating current, the coil assembly 11 will change from being energized to being de-energized. When de-energized, the return spring 14 will return to its original position and move the iron core 12 to the Figure 1 The right end of the liquid inlet rubber head 15 is pushed to compress the sealing cavity 131. At the same time, the volume of the sealing cavity 131 is getting smaller and the pressure is getting larger. Since the liquid outlet rubber head 16 is adhered or one end of the water outlet hole has a large back pressure, the liquid outlet rubber head 16 is tightly sealed. The push rod 151 moves to the right with the liquid inlet rubber head 15, and the push rod 151 rigidly squeezes the liquid outlet rubber head 16, so that the liquid outlet rubber head 16 is easy to open and the water is easily pumped out.

[0056] When the ejector rod 151 fails to squeeze the liquid outlet rubber head 16 open, the sealing head 212 will be stretched open to balance the pressure, and the gas can be discharged from the liquid guide hole 2111 of the branch pipe 211, and the reciprocating operation will discharge the gas.

[0057] When the gas is discharged, water is also pumped out at the same time. The water can enter the sealed cavity 131 and soak the liquid outlet rubber head 16, so that the adhesion between the liquid outlet rubber head 16 and the pump tube 13 is reduced, the liquid outlet rubber head 16 is easy to open, and the water is easily pumped out from the liquid outlet hole.

[0058] It should also be noted that the water pressure in the sealing chamber 13 will also squeeze the sealing head 212 to open, but the sealing head 212 is restricted by the spring seat 214, the stroke of the sealing head 212 will be very short, and the large back pressure also makes the pressure in the sealing chamber relatively large, thereby squeezing the sealing head 212 so that it can be more stably pressed against the connecting hole of the spring seat 214, so that the branch pipe 211 no longer outputs water.

[0059] The electromagnetic pump with high efficiency output in the preferred embodiment is provided with a self-priming structure, so that when the electromagnetic pump is started, the air in the sealed cavity can be discharged through the self-priming structure, so that water can easily enter the sealed cavity and soak the liquid outlet rubber head, so that the adhesion force between the liquid outlet rubber head and other parts is small, the liquid outlet rubber head is easy to open, and the water can be easily pumped out.

[0060] In summary, although the present invention has been disclosed as above in terms of preferred embodiments, the above preferred embodiments are not intended to limit the present invention. A person skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be based on the scope defined in the claims.

Claims

1. An electromagnetic pump with high efficiency output, characterized in that: It includes a coil assembly, a pump tube, an iron core, a return spring, a liquid outlet control spring, a liquid inlet control spring, a liquid outlet rubber head and a liquid inlet rubber head; The two ends of the pump tube are respectively provided with a liquid inlet hole and a liquid outlet hole, the iron core is slidably arranged in the pump tube, the iron core is axially penetrated, the liquid outlet rubber head cooperates with the liquid outlet control spring to unidirectionally seal the liquid outlet hole, the liquid inlet rubber head cooperates with the liquid inlet control spring to unidirectionally seal the port at one end of the iron core, a sealed cavity is formed between the iron core and the liquid outlet hole, and the liquid outlet rubber head and the liquid inlet rubber head block the two ends of the sealed cavity in opposite water blocking directions; Wherein, a push rod is provided at one end of the liquid inlet rubber head close to the sealing cavity, and the push rod squeezes the liquid outlet rubber head to move away from the sealing cavity; The electromagnetic pump with high-efficiency output also includes a self-priming structure, which includes a branch pipe, a sealing head, a self-priming spring and a spring seat. The branch pipe has a liquid guide hole that penetrates along the axial direction, and the liquid guide hole communicates with the sealing cavity and the external space. The sealing head is movably arranged in the branch pipe to block the liquid guide hole. The spring seat is connected to one end of the branch pipe away from the pump pipe, and the self-priming spring is arranged between the sealing head and the spring seat. The branch pipe is threadedly connected to the pump pipe, a convex ring is arranged on the outer periphery of one end of the branch pipe away from the pump pipe, the spring seat comprises a connecting shaft and a buckle portion, a plurality of the buckle portions are distributed on the circumference of the connecting shaft, one end of the connecting shaft is sleeved in the branch pipe, the buckle portion is buckled with the convex ring, so that the spring seat and the branch pipe are conveniently connected; The push rod is detachably connected to one end of the liquid inlet rubber head, and the push rod is used to rigidly squeeze the liquid outlet rubber head; The ejector rod is eccentrically arranged relative to the axial center line of the liquid discharging rubber head.

2. The electromagnetic pump with high efficiency output according to claim 1, characterized in that: A clamping groove is arranged on the outer periphery of one end of the liquid outlet of the pump tube, and a connecting hole for communicating with the self-priming structure is arranged on the pump tube, and the connecting hole is bent to avoid the clamping groove.

3. The electromagnetic pump with high efficiency output according to claim 1, characterized in that: The two ends of the self-priming spring are respectively sleeved with the sealing head and the connecting shaft. The spring seat is provided with a connecting hole connecting the liquid guide hole and the external space. When the sealing head moves a set distance in a direction close to the spring seat, the sealing head seals the connecting hole.

4. The electromagnetic pump with high efficiency output according to claim 3, characterized in that: One end of the sealing head is provided with a conical end portion for sealing the connecting hole, the inner wall surface of the connecting hole is provided with an inner conical surface adapted to the outer peripheral surface of the end portion, and the outer periphery of the other end of the sealing head is provided with a sliding contact protrusion for sliding contact with the inner wall surface of the branch pipe.

5. The electromagnetic pump with high efficiency output according to claim 1, characterized in that: The branch pipe and the sealing head are both made of metal, the liquid guide hole is connected to the liquid inlet hole, when the sealing head blocks the liquid guide hole and the liquid outlet rubber head seals the liquid outlet hole, the elastic force of the self-priming spring is greater than the elastic force of the liquid outlet control spring.

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