CN211008985U - Mechanical liquid injection pump - Google Patents

Abstract

The utility model belongs to the technical field of pumps, and discloses a mechanical liquid injection pump, which comprises a charging basket for loading target liquid; the pump body is used for transferring target liquid and comprises an inner cavity, the top of the inner cavity is lower than the bottom of the charging bucket, a liquid inlet and a liquid outlet are arranged below the inner cavity, and the liquid inlet is communicated with the charging bucket; and the rotary valve core is arranged at the joint of the liquid inlet and the liquid outlet and is used for controlling the opening and closing of the liquid inlet and the liquid outlet. This application can be with the target liquid ration in the storage bucket and the inner chamber of the pump body is flowed into steadily through mechanical liquid injection pump, through the rotation of change valve core, switches to the state that target liquid flows from the inner chamber.

Description

Mechanical liquid injection pump

Technical Field

The utility model relates to a pump technical field especially relates to mechanical liquid injection pump.

Background

The electrolyte injection pump in the current market sucks electrolyte from negative pressure, so that metering is inaccurate; when the electro-hydraulic pump is used for sucking electro-hydraulic fluid, the air cylinder moves backwards to drive the piston to pull backwards to generate negative pressure, the valve core at the fluid suction port is lifted upwards by suction, the spring on the valve core contracts, the electro-hydraulic pump sucks the pump body, meanwhile, the valve core at the fluid outlet can feel that the suction force moves downwards, the spring on the valve core springs open, the valve core blocks the fluid outlet, when the electro-hydraulic pump is used for injecting the electro-hydraulic fluid, the air cylinder moves forwards to push the piston to move forwards, the electro-hydraulic pump in the pump body flushes the valve core blocking the fluid outlet, the spring on the valve core contracts by pressure, the electro-hydraulic pump is discharged out of the pump body, meanwhile, the valve core at the fluid suction port can also feel that the pressure moves downwards, the spring springs open to block the fluid suction port, therefore, the amount of the electro-hydraulic pump for sucking is controlled by the negative pressure generated by.

SUMMERY OF THE UTILITY MODEL

To the deficiency among the prior art, the to-be-solved technical problem of the utility model lies in providing a mechanical liquid injection pump, can realize the quantitative transport of target liquid under the prerequisite that need not the reciprocal pull of piston.

To achieve the purpose, the utility model adopts the following technical proposal:

a mechanical priming pump comprising:

the charging basket is used for loading target liquid;

the pump body is used for transferring target liquid and comprises an inner cavity, the top of the inner cavity is lower than the bottom of the charging basket, a liquid inlet and a liquid outlet are arranged below the inner cavity, and the liquid inlet is communicated with the charging basket;

and the rotary valve core is arranged at the joint of the liquid inlet and the liquid outlet and is used for controlling the opening and closing of the liquid inlet and the liquid outlet.

As a preferred technical solution, the method further comprises:

a piston rod slidably mounted on top of the internal cavity for defining the volume of the internal cavity;

the adjuster is installed at one end, far away from the pump body, of the piston rod and used for controlling the depth of the piston rod inserted into the inner cavity.

As a preferred technical scheme, a piston cavity is arranged on one side of the inner cavity, a piston sleeve is arranged in the piston cavity, the piston sleeve is of a through hole cylindrical structure, and the piston rod is inserted into the through hole of the piston sleeve.

As a preferable technical scheme, the rotary valve core is provided with a liquid inlet hole and a liquid outlet hole, the liquid inlet hole penetrates and communicates one end surface of the rotary valve core close to the liquid inlet with the peripheral side surface of the rotary valve core, and the liquid outlet hole penetrates and communicates the peripheral side surface of the middle part of the rotary valve core.

As a preferred technical solution, the method further comprises:

the mounting sleeve is of a through hole structure, the mounting sleeve is mounted on the outer side of the top of the pump body, and an inner through hole of the mounting sleeve is communicated with the liquid outlet;

the liquid injection pipe is connected with the mounting sleeve at one end, a containing part is formed by the top center of the liquid injection pipe and the center of the mounting sleeve, a liquid injection nozzle is arranged at the center of the liquid injection pipe and communicated with the containing part, and the liquid injection nozzle is used for discharging target liquid;

a spring spool disposed within the receptacle;

the elastic element is sleeved outside the spring valve core and used for enabling the spring valve core to seal the inner through hole of the mounting sleeve;

the rotary valve sleeve is of a through hole cylindrical structure, the rotary valve sleeve is installed in the liquid inlet, the rotary valve core is installed in the through hole in the rotary valve sleeve, and the rotary valve core is connected with the rotary valve sleeve in a rotating mode.

As a preferred technical solution, a first through hole is arranged at one side of the valve sleeve close to the piston cavity, and the first through hole is used for communicating the internal through hole of the valve sleeve with the piston cavity;

and one side of the valve sleeve, which is close to the mounting sleeve, is provided with a second through hole, and the second through hole is used for communicating the internal through hole of the valve sleeve with the internal through hole of the mounting sleeve.

As a preferred technical scheme, one side that the inner chamber is kept away from the inlet sets up rotatory mouth, still includes:

the rotating shaft is of a cylindrical structure, one end of the rotating shaft is connected with the rotary valve core, the other end of the rotating shaft protrudes out of the rotating port, and the rotating shaft is used for driving the rotary valve core to rotate.

As a preferred technical scheme, still include the swinging boom, the one end of swinging boom with protruding the stretching of pivot the one end of rotation mouth is connected, the swinging boom is used for driving the pivot is rotatory.

As a preferable technical scheme, the lubricating pump further comprises a wet cup, the wet cup is of a through hole structure and is mounted on the outer side of the top of the pump body, the piston rod penetrates through the through hole of the wet cup, and the wet cup is used for loading a lubricating agent.

As a preferred technical scheme, the sealing device further comprises a sealing ring assembly, wherein the sealing ring assembly comprises a first sealing ring, a second sealing ring, a third sealing ring and a fourth sealing ring;

the first sealing ring is arranged between the wet cup and the piston sleeve and sleeved on the outer circumference of the piston rod, and is used for preventing a lubricant from leaking into the inner through hole of the piston sleeve from the contact surface of the piston rod and the wet cup;

the second sealing ring is arranged between the outer circumference of the wet cup and the piston cavity and is used for preventing target liquid from leaking from the contact surface of the wet cup and the pump body;

the third sealing ring is arranged between the outer circumference of the valve sleeve and the liquid inlet and is used for preventing target liquid from leaking from a contact surface of the valve sleeve and the pump body;

the fourth sealing ring is arranged between the outer circumference of the rotary valve core and the inner through hole of the rotary valve sleeve and is used for preventing target liquid from leaking from the contact surface of the rotary valve core and the rotary valve sleeve.

The utility model has the advantages that: providing a mechanical liquid injection pump, which comprises a charging bucket and is used for loading target liquid; the pump body is used for transferring target liquid; the pump body comprises an inner cavity, the top of the inner cavity is lower than the bottom of the charging bucket, a liquid inlet and a liquid outlet are arranged below the inner cavity, the liquid inlet is communicated with the charging bucket, and quantitative conveying of target liquid can be achieved on the premise that a piston does not need to be pulled in a reciprocating manner; the rotary valve core is arranged at the joint of the liquid inlet and the liquid outlet and is used for controlling the opening and closing of the liquid inlet and the liquid outlet; the piston rod is slidably mounted at the top of the inner cavity, a piston cavity is arranged on one side of the inner cavity, a piston sleeve is arranged in the piston cavity, the piston sleeve is of a through hole cylindrical structure, the piston rod is inserted into the through hole of the piston sleeve, and the piston rod is used for limiting the capacity of the inner cavity; the adjuster is installed at one end, far away from the pump body, of the piston rod and used for controlling the depth of the piston rod inserted into the inner cavity. After the depth of the inner cavity of the piston rod is set, target liquid can naturally flow into the inner cavity from the charging bucket, the rotating arm is swung, the rotating arm drives the rotating shaft and the rotating valve core to rotate in the rotating valve sleeve, the inner cavity is communicated with the liquid outlet through the liquid discharge hole, the spring valve core is flushed away by the target liquid through the liquid discharge hole and the liquid outlet, the target liquid flows out from the liquid injection nozzle, and the problem that the injection amount is inaccurate due to the fact that air pressure is influenced by sealing performance when the target liquid flows into the inner cavity is solved.

Drawings

The present invention will be described in further detail with reference to the accompanying drawings and examples.

FIG. 1 is a schematic structural view of the mechanical liquid injection pump according to the first embodiment when the electro-liquid flows out of the inner cavity;

FIG. 2 is a cross-sectional view B-B shown in FIG. 1;

FIG. 3 is an enlarged view of a portion of FIG. 2 at A;

FIG. 4 is a schematic view of a first perspective of the pump body according to one embodiment;

FIG. 5 is a schematic structural view of the mechanical liquid injection pump according to the first embodiment when the electro-hydraulic fluid flows into the inner cavity;

FIG. 6 is a cross-sectional view of C-C shown in FIG. 5;

in fig. 1 to 6:

1. a charging bucket;

2. a pump body; 21. an inner cavity; 211. a liquid inlet; 212. a liquid outlet; 213. a piston cavity; 214. a rotation port;

3. a rotary valve core; 31. a liquid inlet hole; 32. a drain hole;

4. a piston rod;

5. a regulator;

6. a piston sleeve;

7. installing a sleeve; 71. an accommodating portion;

8. a liquid injection pipe; 81. a liquid injection nozzle;

9. a spring spool;

10. an elastic member;

11. a valve sleeve is rotated; 111. a first through hole; 112. a second through hole;

12. a rotating arm;

13. wetting the cup;

14. a seal ring assembly; 141. a first seal ring; 142. a second seal ring; 143. a third seal ring; 144. a fourth seal ring;

15. a rotating shaft.

Detailed Description

In order to make the technical problems, technical solutions and technical effects achieved by the present invention more clear, the embodiments of the present invention will be described in further detail with reference to the accompanying drawings, and obviously, the described embodiments are only some embodiments, not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present invention.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.

The first embodiment is as follows:

the mechanical liquid injection pump comprises a charging basket 1 for loading target liquid; the pump body 2 is used for transferring target liquid, the pump body 2 comprises an inner cavity 21, the top of the inner cavity 21 is lower than the bottom of the charging basket 1, a liquid inlet 211 and a liquid outlet 212 are arranged below the inner cavity 21, and the liquid inlet 211 is communicated with the charging basket 1; and the rotary valve core 3 is arranged at the joint of the liquid inlet 211 and the liquid outlet 212 and is used for controlling the opening and closing of the liquid inlet 211 and the liquid outlet 212.

In the present embodiment, the piston rod 4 is further included, and the piston rod 4 is slidably mounted on the top of the inner cavity 21 and used for limiting the capacity of the inner cavity 21; the adjuster 5 is installed at one end, far away from the pump body 2, of the piston rod 4, and the adjuster 5 is used for controlling the depth of the piston rod 4 inserted into the inner cavity 21.

In this embodiment, a piston cavity 213 is disposed at one side of the inner cavity 21, a piston sleeve 6 is disposed in the piston cavity 213, the piston sleeve 6 is a through-hole cylindrical structure, and the piston rod 4 is inserted into the through-hole of the piston sleeve 6.

In this embodiment, the rotary valve core 3 is provided with a liquid inlet hole 31 and a liquid outlet hole 32, the liquid inlet hole 31 penetrates and communicates one end surface of the rotary valve core 3 close to the liquid inlet 211 with the peripheral side surface of the rotary valve core 3, and the liquid outlet hole 32 penetrates and communicates the peripheral side surface of the middle part of the rotary valve core 3.

In this embodiment, the liquid pump further comprises an installation sleeve 7, the installation sleeve 7 is a through hole structure, the installation sleeve 7 is installed on the outer side of the bottom of the pump body 2, and a through hole in the top of the installation sleeve 7 is communicated with the liquid outlet 212; an injection pipe 8, one end of the injection pipe 8 is connected with the mounting sleeve 7, a containing part 71 is formed between the top center of the injection pipe 8 and the center of the mounting sleeve 7, an injection nozzle 81 is arranged at the center of the injection pipe 8, the injection nozzle 81 is communicated with the containing part 71, and the injection nozzle 81 is used for discharging the target liquid; a spring spool 9, the spring spool 9 being disposed in the housing portion 71; the elastic element 10 is sleeved outside the spring valve core 9, and the elastic element 10 is used for enabling the spring valve core 9 to seal the through hole at the top of the mounting sleeve 7; the rotary valve sleeve 11 is of a through hole cylindrical structure, the rotary valve sleeve 11 is installed in the liquid inlet 211, the rotary valve core 3 is installed in the through hole in the rotary valve sleeve 11, and the rotary valve core 3 is rotatably connected with the rotary valve sleeve 11.

In this embodiment, a first through hole 111 is disposed on a side of the valve sleeve 11 close to the piston cavity 213, and the first through hole 111 is used for communicating an internal through hole of the valve sleeve 11 with the piston cavity 213; a second through hole 112 is formed in one side of the valve sleeve 11 close to the mounting sleeve 7, and the second through hole 112 is used for communicating an internal through hole of the valve sleeve 11 with a top through hole of the mounting sleeve 7.

In this embodiment, when the target liquid needs to flow into the inner cavity 21 from the material barrel 1, the rotary valve core 3 rotates, the liquid inlet hole 31 connects the liquid inlet 211 with the inner through hole of the piston sleeve 6, and the target liquid passes through the inner through hole of the rotary valve sleeve 11 from the liquid inlet 211, enters the liquid inlet hole 31, and then enters the inner through hole of the piston sleeve 6 through the first through hole 111; when the target liquid needs to be discharged, the rotary valve element 3 rotates reversely, the liquid discharge hole 32 is communicated with the inner through hole of the piston sleeve 6 and the liquid outlet 212, and the target liquid passes through the first through hole 111, the liquid discharge hole 32, the second through hole 112, the liquid outlet 212 and the accommodating portion 71 in sequence from the inner through hole of the piston sleeve 6 and is finally injected into the battery through the liquid injection nozzle 81.

In this embodiment, one side of the inner cavity 21, which is away from the liquid inlet 211, is provided with a rotation port 214, the rotation shaft 15 further includes a rotation shaft 15, the rotation shaft 15 is of a cylindrical structure, one end of the rotation shaft 15 is connected to the rotary valve element 3, the other end of the rotation shaft 15 protrudes out of the rotation port 214, and the rotation shaft 15 is used for driving the rotary valve element 3 to rotate.

In this embodiment, the device further includes a rotating arm 12, one end of the rotating arm 12 is connected to one end of the rotating shaft 15 protruding out of the rotating port 214, and the rotating arm 12 is used to drive the rotating shaft 15 to rotate.

In this embodiment, the central axis of the liquid inlet hole 31 is perpendicular to the central axis of the liquid outlet hole 32, when the inner cavity 21 is completely filled with the target liquid, the rotating arm 12 is swung to rotate 90 °, the switching from the liquid inlet to the liquid outlet is completed, the target liquid flows out of the inner cavity 21, and when the target liquid is completely discharged out of the inner cavity 21, the rotating arm 12 is swung to rotate 90 ° in the opposite direction, the switching from the liquid outlet to the liquid inlet is completed.

In the embodiment, the wet cup 13 is further included, the wet cup 13 is of a through hole structure, the wet cup 13 is mounted on the outer side of the top of the pump body 2, the piston rod 4 penetrates through the through hole of the wet cup 13, and the wet cup 13 is used for loading lubricant.

In this embodiment, the present invention further includes a sealing ring assembly 14, wherein the sealing ring assembly 14 includes a first sealing ring 141, a second sealing ring 142, a third sealing ring 143, and a fourth sealing ring 144; the first sealing ring 141 is arranged between the wet cup 13 and the piston sleeve 6 and sleeved on the outer circumference of the piston rod 4, and the first sealing ring 141 is used for preventing lubricant from leaking into the inner through hole of the piston sleeve 6 from the contact surface of the piston rod 4 and the wet cup 13; the second seal ring 142 is disposed between the outer circumference of the wet cup 13 and the piston chamber 213, and the second seal ring 142 is used for preventing the target liquid from leaking from the contact surface of the wet cup 13 and the pump body 2; the third sealing ring 143 is disposed between the outer circumference of the valve sleeve 11 and the liquid inlet 211, and the third sealing ring 143 is used for preventing the target liquid from leaking from the contact surface between the valve sleeve 11 and the pump body 2; the fourth sealing ring 144 is disposed between an outer circumference of the rotary valve core 3 and an inner through hole of the rotary valve sleeve 11, and the fourth sealing ring 144 is used to prevent the target liquid from leaking from a contact surface between the rotary valve core 3 and the rotary valve sleeve 11.

In this embodiment, the target liquid is any one of flowable objects such as an electro-hydraulic liquid, and in this embodiment, it is preferable that the target liquid is an electro-hydraulic liquid, when a certain amount of electro-hydraulic liquid needs to flow into the inner cavity 21 from the charging basket 1, the capacity of the inner cavity 21 is defined by setting the position of the piston rod 4 in the inner cavity 21, the rotating arm 12 is swung, the rotating arm 12 drives the rotating shaft 15 and the rotary valve core 3 to rotate in the rotary valve sleeve 11, the liquid inlet hole 31 communicates the internal through hole of the piston sleeve 6 with the liquid inlet 211, the electro-hydraulic liquid naturally flows into the inner cavity 21 due to the action of a liquid level difference, when the electro-hydraulic liquid needs to be injected into the battery, the rotating arm 12 is swung, the rotating arm 12 drives the rotating shaft 15 and the rotary valve core 3 to rotate in the rotary valve sleeve 11, and the liquid outlet hole 32 communicates the inner cavity, the electricity liquid that inner chamber 21 stored relies on self gravity to follow the outage 32 is walked down, and the kicking-off blocks up the top through-hole of installation cover 7 spring case 9, the cover is established outside spring case 9 elasticity piece 10 receives the shrink after the pressure, and electricity liquid along annotate liquid mouth 81 and discharge, pour into the battery into, electricity liquid follow after inner chamber 21 has been arranged the battery, the cover is established outside spring case 9 elasticity piece 10 is automatic bounced out because of not having behind the pressure that electricity liquid strikeed, will spring case 9 blocks up the top through-hole of installation cover 7 prevents the dropping liquid.

In the description herein, it is to be understood that the terms "upper", "lower", "right", and the like are used in an orientation or positional relationship based on that shown in the drawings for convenience of description and simplicity of operation, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used merely for descriptive purposes and are not intended to have any special meaning.

In the description herein, references to the description of "an embodiment," "an example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.

In addition, the foregoing is only the preferred embodiment of the present invention and the technical principles applied thereto. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.

Claims (10)

1. Mechanical liquid charge pump, its characterized in that includes:

the charging basket is used for loading target liquid;

the pump body is used for transferring target liquid and comprises an inner cavity, the top of the inner cavity is lower than the bottom of the charging basket, a liquid inlet and a liquid outlet are arranged below the inner cavity, and the liquid inlet is communicated with the charging basket;

and the rotary valve core is arranged at the joint of the liquid inlet and the liquid outlet and is used for controlling the opening and closing of the liquid inlet and the liquid outlet.

2. The mechanical priming pump of claim 1, further comprising:

a piston rod slidably mounted on top of the internal cavity for defining the volume of the internal cavity;

the adjuster is installed at one end, far away from the pump body, of the piston rod and used for controlling the depth of the piston rod inserted into the inner cavity.

3. The mechanical liquid injection pump of claim 2, wherein a piston cavity is formed in one side of the inner cavity, a piston sleeve is arranged in the piston cavity, the piston sleeve is of a through-hole cylindrical structure, and the piston rod is inserted into the through-hole of the piston sleeve.

4. The mechanical liquid charge pump of claim 3, wherein the rotary valve core is provided with a liquid inlet hole and a liquid outlet hole, the liquid inlet hole penetrates and communicates one end surface of the rotary valve core close to the liquid inlet with the peripheral side surface of the rotary valve core, and the liquid outlet hole penetrates and communicates the peripheral side surface of the middle part of the rotary valve core.

5. The mechanical priming pump of claim 4, further comprising:

the mounting sleeve is of a through hole structure, the mounting sleeve is mounted on the outer side of the bottom of the pump body, and an inner through hole of the mounting sleeve is communicated with the liquid outlet;

the liquid injection pipe is connected with the mounting sleeve at one end, a containing part is formed by the top center of the liquid injection pipe and the center of the mounting sleeve, a liquid injection nozzle is arranged at the center of the liquid injection pipe and communicated with the containing part, and the liquid injection nozzle is used for discharging target liquid;

a spring spool disposed within the receptacle;

the elastic element is sleeved outside the spring valve core and used for enabling the spring valve core to seal the inner through hole of the mounting sleeve;

the rotary valve sleeve is of a through hole cylindrical structure, the rotary valve sleeve is installed in the liquid inlet, the rotary valve core is installed in the through hole in the rotary valve sleeve, and the rotary valve core is connected with the rotary valve sleeve in a rotating mode.

6. The mechanical priming pump of claim 5, wherein a first through hole is formed in a side of the valve sleeve close to the piston cavity, and the first through hole is used for communicating an internal through hole of the valve sleeve with the piston cavity;

and one side of the valve sleeve, which is close to the mounting sleeve, is provided with a second through hole, and the second through hole is used for communicating the internal through hole of the valve sleeve with the internal through hole of the mounting sleeve.

7. The mechanical priming pump of claim 6, wherein a side of the internal cavity remote from the liquid inlet is provided with a rotary port, further comprising:

the rotating shaft is of a cylindrical structure, one end of the rotating shaft is connected with the rotary valve core, the other end of the rotating shaft protrudes out of the rotating port, and the rotating shaft is used for driving the rotary valve core to rotate.

8. The mechanical liquid injection pump of claim 7, further comprising a rotating arm, wherein one end of the rotating arm is connected to one end of the rotating shaft protruding out of the rotating port, and the rotating arm is used for driving the rotating shaft to rotate.

9. The mechanical priming pump of claim 8, further comprising a wet cup, wherein the wet cup is a through hole structure, the wet cup is mounted on the top outer side of the pump body, the piston rod penetrates through the through hole of the wet cup, and the wet cup is used for loading lubricant.

10. The mechanical priming pump of claim 9, further comprising a seal ring assembly, said seal ring assembly comprising a first seal ring, a second seal ring, a third seal ring, a fourth seal ring;

the first sealing ring is arranged between the wet cup and the piston sleeve and sleeved on the outer circumference of the piston rod, and is used for preventing a lubricant from leaking into the inner through hole of the piston sleeve from the contact surface of the piston rod and the wet cup;

the second sealing ring is arranged between the outer circumference of the wet cup and the piston cavity and is used for preventing target liquid from leaking from the contact surface of the wet cup and the pump body;

the third sealing ring is arranged between the outer circumference of the valve sleeve and the liquid inlet and is used for preventing target liquid from leaking from a contact surface of the valve sleeve and the pump body;

the fourth sealing ring is arranged between the outer circumference of the rotary valve core and the inner through hole of the rotary valve sleeve and is used for preventing target liquid from leaking from the contact surface of the rotary valve core and the rotary valve sleeve.

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