CN115645099A - Self-cleaning type goes out liquid system - Google Patents

Abstract

The invention provides a self-cleaning type liquid outlet system, which comprises: the liquid pump device comprises a liquid pump cavity and a piston, wherein the piston is arranged in a pump cavity of the liquid pump cavity in a reciprocating motion manner, the piston divides the pump cavity into a liquid inlet cavity with constant volume and a liquid outlet cavity with volume changing along with the reciprocating motion of the piston, a liquid inlet one-way valve which only allows liquid in the liquid inlet cavity to flow to the liquid outlet cavity is integrated in the piston, and the liquid inlet one-way valve does not have a valve core resetting structure and only switches the self opening and closing state by means of the reciprocating motion of the piston; the liquid inlet flow channel is communicated with the liquid inlet cavity; the liquid outlet flow passage is communicated with the liquid outlet cavity through the liquid outlet one-way valve. The invention not only can save the installation space for the liquid inlet check valve, but also can solve the problem of dirt storage and scale deposit caused by the valve core resetting structure, and especially can improve the self-cleaning property of the tooth flusher.

Description

Self-cleaning type goes out liquid system

Technical Field

The invention relates to the technical field of oral cleaning, in particular to a self-cleaning liquid outlet system.

Background

With the improvement of living standard, people's consciousness on oral care is gradually improved, and oral cleaning tools on the market are more diversified, wherein the tooth flushing device as a substitute of the traditional dental floss becomes one of the necessary small household appliances in the family. The basic working principle is that a pump body is used for pumping water from a water tank, and high-pressure pulse water flow which is sprayed for hundreds of times to thousands of times per minute is sprayed through a nozzle to clean food residues and dental plaque in gaps between teeth, massage gums and the like, so that the oral environment is improved.

The existing water pump of the tooth flushing device uses a ball valve as a one-way valve. Because the water pump frequency of the tooth flushing device is high, the valve cores of the inlet check valve and the outlet check valve are provided with return springs. In addition, the valve core can not rotate freely, the self-cleaning performance is poor, and the return spring is easy to store dirt and dirty. In addition, the inlet check valve is provided with a return spring, so that water is not saved.

Disclosure of Invention

In view of the above-mentioned shortcomings of the prior art, the present invention provides a self-cleaning liquid outlet system, which can not only save the installation space for the liquid inlet check valve, but also solve the problem of dirt collection and scale deposit caused by the valve core reset structure, and especially can improve the self-cleaning performance of the tooth flusher.

In order to solve the technical problem, the invention provides a self-cleaning type liquid outlet system, which comprises:

the liquid pump device comprises a liquid pump cavity and a piston, wherein the piston is arranged in a pump cavity of the liquid pump cavity in a reciprocating manner, the piston divides the pump cavity into a liquid inlet cavity with constant volume and a liquid outlet cavity with variable volume along with the reciprocating movement of the piston, a liquid inlet one-way valve which only allows liquid in the liquid inlet cavity to flow to the liquid outlet cavity is integrated in the piston, and the liquid inlet one-way valve does not have a valve core resetting structure and only switches the self opening and closing state by means of the reciprocating movement of the piston;

the liquid inlet flow channel is communicated with the liquid inlet cavity;

the liquid outlet flow passage is communicated with the liquid outlet cavity through the liquid outlet one-way valve.

Preferably, the feed liquor check valve comprises a feed liquor valve cavity formed inside the piston, a feed liquor valve core restrained in the feed liquor valve cavity in a floating manner, a feed liquor valve seat formed inside the piston and located on one side, far away from the liquid outlet cavity, of the feed liquor valve cavity, and an overflowing limiting structure communicated with the feed liquor valve cavity and the liquid outlet cavity, wherein the feed liquor valve seat is provided with a overflowing hole communicated with the feed liquor valve cavity and the feed liquor cavity, the feed liquor valve core is abutted against the feed liquor valve seat when the piston makes a liquid discharge stroke, and the feed liquor valve core is separated from the feed liquor valve seat when the piston makes a liquid suction stroke.

Preferably, the piston comprises a piston body in sliding fit with the liquid pump cavity and a piston head arranged at one end of the piston body; the liquid inlet valve cavity is formed in the piston body in a manner of opening towards the liquid outlet cavity, the liquid inlet valve core is limited and restricted by the piston head, and the overflowing limiting structure is formed in the piston head.

Preferably, the overflowing limiting structure comprises an overflowing hole formed in the piston head and a valve core stop ring arranged in the overflowing hole.

Preferably, the piston comprises a piston body, an annular groove is formed in the outer peripheral wall of the piston body, and the annular groove and the liquid pump cavity jointly define the liquid inlet cavity.

Preferably, the piston is provided with a first sealing ring and a second sealing ring which are respectively in liquid-tight fit with the liquid pump cavity, the first sealing ring and the second sealing ring are respectively positioned on the outer wall of the piston at two sides of the liquid inlet cavity, the first sealing ring is close to the liquid outlet cavity, the second sealing ring is far away from the liquid outlet cavity, and the maximum sealing pressure of the first sealing ring is greater than that of the second sealing ring.

Preferably, the liquid outlet check valve comprises a liquid outlet valve cavity formed in the liquid pump cavity, a liquid outlet valve core restrained in the liquid outlet valve cavity in a floating manner, a liquid outlet valve seat formed in the liquid pump cavity and located on one side, close to the liquid outlet cavity, of the liquid outlet valve cavity, and a jet flow limiting structure for communicating the liquid outlet valve cavity with the liquid outlet flow channel, the liquid outlet valve core abuts against the jet flow limiting structure when the piston performs a liquid discharge stroke, and the liquid outlet valve core abuts against the liquid outlet valve seat when the piston performs a liquid suction stroke.

Preferably, the jet flow limiting structure comprises a jet flow hole formed in the liquid pump cavity and a valve core stop piece which is arranged on the wall of the jet flow hole and protrudes in the radial direction.

Preferably, the liquid pump cavity includes the feed liquor adapter and the embedded play liquid adapter that goes out the feed liquor adapter, and the inside shaping of feed liquor adapter has the pump chamber goes out the shaping on the liquid adapter and has go out the liquid flow way.

Preferably, the liquid pump cavity includes feed liquor adapter and the piston pipe embedded in feed liquor adapter, and the inside shaping of feed liquor adapter has the confession liquid chamber of keeping in with the feed liquor runner intercommunication, is equipped with on the piston pipe with feed liquor chamber and a plurality of intercommunicating pores that supply liquid chamber intercommunication of keeping in.

As mentioned above, the self-cleaning type liquid outlet system has the following beneficial effects: when the piston is pulled back to perform a liquid suction stroke, the volume of the liquid outlet cavity is rapidly enlarged, negative pressure is generated in the liquid outlet cavity, the liquid outlet one-way valve is switched to a closed state due to the negative pressure, the liquid inlet one-way valve is switched to an open state due to the negative pressure, and liquid flows through the liquid inlet flow channel, the liquid inlet cavity and the liquid outlet cavity in sequence. When the piston is pushed out to perform a liquid discharge stroke, the volume of the liquid outlet cavity is rapidly reduced, positive pressure is generated in the liquid outlet cavity, the liquid inlet one-way valve is switched to a closed state due to the positive pressure, the liquid outlet one-way valve is switched to an open state due to the positive pressure, and liquid in the liquid outlet cavity is ejected after sequentially flowing through the liquid outlet one-way valve and the liquid outlet flow channel. The innovation points of the invention are as follows: first, the internal integration of piston has the feed liquor check valve that only allows the liquid flow direction in the feed liquor intracavity to go out the liquid chamber, can save the installation space who is used for the feed liquor check valve like this for liquid pump device's overall structure is compacter, thereby makes self-cleaning type play liquid system's overall structure compacter, and whole size can be designed more exquisitely, especially can make the small-size product of similar towards tooth ware more portable. Secondly, the feed liquor check valve does not have case reset structure and only relies on the reciprocating motion of piston to switch self open and close state, can save like this in the runner and have similar to current spring, and be difficult to self-cleaning spare part that resets, can solve the dirty problem of holding that causes by case reset structure. Therefore, the self-cleaning liquid outlet system can not only save the installation space for the liquid inlet check valve, but also solve the problem of dirt storage and scale deposit caused by the valve core reset structure, and especially can improve the self-cleaning property of the tooth flushing device.

Drawings

FIG. 1 is a front view of a self-cleaning type dispensing system of the present invention;

FIG. 2 isbase:Sub>A cross-sectional view taken along line A-A of FIG. 1;

FIG. 3 is a view showing an internal structure of a self-cleaning type liquid outlet system of the present invention;

FIG. 4 is an enlarged view taken along section B of FIG. 3;

FIG. 5 is an enlarged view taken along section C of FIG. 3;

FIG. 6 shows a perspective view of the piston;

fig. 7 is a view showing an internal structure of the piston.

Description of the element reference numerals

1. Liquid pump device

11. Liquid pump cavity

111. Liquid inlet adapter

111a liquid supply temporary storage cavity

112. Liquid outlet adapter

113. Piston tube

113a communication hole

12. Piston

121. Piston body

122. Piston head

123. Annular groove

13. Liquid inlet cavity

14. Liquid outlet cavity

15. First seal ring

16. Second seal ring

17. Transmission mechanism

18. Driving mechanism

2. Liquid inlet one-way valve

21. Liquid inlet valve cavity

22. Liquid inlet valve core

23. Liquid inlet valve seat

231. Overflow hole

24. Over-current limiting structure

241. Overflowing hole

242. Valve core stop ring

3. Liquid inlet flow passage

4. Liquid outlet flow passage

5. Liquid outlet one-way valve

51. Liquid outlet valve cavity

52. Liquid outlet valve core

53. Liquid outlet valve seat

54. Jet flow limiting structure

541. Jet hole

542. Valve core stop

6. Nozzle with a nozzle body

Detailed Description

The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.

It should be understood that the structures, ratios, sizes, and the like shown in the drawings are only used for matching the disclosure of the present disclosure, and are not used for limiting the conditions that the present disclosure can be implemented, so that the present disclosure is not limited to the technical essence, and any structural modifications, ratio changes, or size adjustments should still fall within the scope of the present disclosure without affecting the efficacy and the achievable purpose of the present disclosure. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.

As shown in fig. 1 to 7, the present invention provides a self-cleaning type liquid outlet system, comprising:

the liquid pump device 1 comprises a liquid pump cavity 11 and a piston 12, wherein the piston 12 is arranged in a pump cavity of the liquid pump cavity 11 in a reciprocating mode, the piston 12 divides the pump cavity into a liquid inlet cavity 13 with constant volume and a liquid outlet cavity 14 with variable volume along with the reciprocating motion of the piston 12, a liquid inlet one-way valve 2 which only allows liquid in the liquid inlet cavity 13 to flow to the liquid outlet cavity 14 is integrated in the piston 12, and the liquid inlet one-way valve 2 does not have a valve core resetting structure and only switches the self opening and closing state by means of the reciprocating motion of the piston 12;

the liquid inlet flow channel 3 is communicated with the liquid inlet cavity 13;

the liquid outlet flow passage 4 is communicated with the liquid outlet cavity 14 through the liquid outlet one-way valve 5.

In the present invention, the piston 12 reciprocates in the pump cavity of the liquid pump cavity 11 under the driving of an external force. During the reciprocating motion of the piston 12, the liquid inlet chamber 13 is lifted and lowered synchronously with the piston 12 and has a constant volume, and the liquid outlet chamber 14 is always located at one side of the pump chamber and is enlarged or reduced along with the stroke change of the piston 12. When the piston 12 is pulled back to perform a suction stroke, the volume of the liquid outlet cavity 14 is rapidly enlarged, negative pressure is generated in the liquid outlet cavity 14, the liquid outlet one-way valve 5 is switched to a closed state due to the negative pressure, the liquid inlet one-way valve 2 is switched to an open state due to the negative pressure, and liquid flows through the liquid inlet flow channel 3, the liquid inlet cavity 13 and the liquid outlet cavity 14 in sequence. When the piston 12 is pushed out to perform a liquid discharge stroke, the volume of the liquid outlet cavity 14 is rapidly reduced, positive pressure is generated in the liquid outlet cavity 14, the liquid inlet check valve 2 is switched to a closed state due to the positive pressure, the liquid outlet check valve 5 is switched to an open state due to the positive pressure, and liquid in the liquid outlet cavity 14 is ejected after sequentially flowing through the liquid outlet check valve 5 and the liquid outlet flow channel 4.

The innovation points of the invention are as follows: firstly, the liquid inlet one-way valve 2 which only allows the liquid in the liquid inlet cavity 13 to flow to the liquid outlet cavity 14 is integrated in the piston 12, so that the installation space for the liquid inlet one-way valve 2 can be saved, the whole structure of the liquid pump device 1 is more compact, the whole structure of the self-cleaning liquid outlet system is more compact, the whole size can be designed to be more exquisite, and especially, the small-sized product similar to a tooth flushing device can be more portable. Secondly, the liquid inlet one-way valve 2 does not have a valve core resetting structure and only switches the self opening and closing state by means of the reciprocating motion of the piston 12, so that resetting parts which are similar to the existing spring and difficult to self-clean can be omitted in a flow channel, and the problem of dirt collection and dirt collection caused by the valve core resetting structure can be solved.

Therefore, the self-cleaning liquid outlet system can save the installation space for the liquid inlet check valve 2, solve the problem of dirt storage and dirt collection caused by the valve core resetting structure and particularly improve the self-cleaning property of the tooth flushing device.

As shown in fig. 2 and 3, the liquid pump device 1 further includes a transmission mechanism 17 and a driving mechanism 18, and the piston 12 is drivingly connected to the driving mechanism 18 through the transmission mechanism 17. The piston 12 is driven by a drive mechanism 18 to reciprocate. As an alternative to the above-described mounting of the piston 12, a large part of the piston 12 extends into the pump chamber, and a small part of the piston 12 extends out of the pump chamber and is connected to the transmission 17.

The liquid pump apparatus 1 may be a plunger pump; the transmission mechanism 17 and the driving mechanism 18 are both existing mechanisms, the transmission mechanism 17 may be an eccentric wheel assembly, and the driving mechanism 18 may be a motor assembly, which will not be described herein again.

As shown in fig. 5, 6 and 7, in order to make the liquid inlet check valve 2 switch its open/close state only by the reciprocating motion of the piston 12, the liquid inlet check valve 2 includes a liquid inlet valve cavity 21 formed inside the piston 12, a liquid inlet valve core 22 restrained in the liquid inlet valve cavity 21 in a floating manner, a liquid inlet valve seat 23 formed inside the piston 12 and located on one side of the liquid inlet valve cavity 21 away from the liquid outlet cavity 14, and an overflow limiting structure 24 communicating the liquid inlet valve cavity 21 with the liquid outlet cavity 14, wherein the liquid inlet valve seat 23 has an overflow hole 231 communicating the liquid inlet valve cavity 21 with the liquid inlet cavity 13, the liquid inlet valve core 22 abuts against the liquid inlet valve seat 23 when the piston 12 makes a liquid discharge stroke, and the liquid inlet valve core 22 is separated from the liquid inlet valve seat 23 when the piston 12 makes a stroke. In the structure of the liquid inlet check valve 2, there is no return part like a spring, and the self-cleaning property of the liquid inlet check valve 2 is the best. In addition, the liquid inlet check valve 2 is integrated on the piston 12, so that the closing time of the liquid inlet check valve 2 can be conveniently controlled. Specifically, different from the arrangement mode of the existing liquid inlet one-way valve, the valve seat of the existing liquid inlet one-way valve is fixed, and if the existing liquid inlet one-way valve does not have a return spring, the process that the valve core of the existing liquid inlet one-way valve falls to the valve seat is slow (the inertia of the valve core is the main reason) and difficult to control when liquid is discharged. If the existing liquid inlet one-way valve is provided with the return spring, the return spring can store dirt and dirty when liquid is discharged, and the valve core of the existing liquid inlet one-way valve can quickly fall to the valve seat, so that the water saving effect is not achieved. In the invention, the liquid inlet valve seat 23 of the liquid inlet check valve 2 is integrated on the piston 12, when the piston 12 performs a liquid discharge stroke, the liquid inlet valve seat 23 moves together and approaches the liquid inlet valve core 22, and moves to the highest position point of the liquid inlet valve core 22 (namely the position of the liquid inlet valve core 22 stopped by the overflowing limiting structure 24) at most to be capable of receiving the liquid inlet valve core 22, so that the liquid inlet check valve 2 is switched to a closed state, the closing time point of the liquid inlet check valve 2 can be ensured to be later than that of the existing liquid inlet check valve with a return spring, and the closing time point of the liquid inlet check valve 2 can be ensured to be before the flow peak value of the liquid pump device 1 appears, thereby realizing the pre-peak water saving effect. In addition, the closing time of the liquid inlet check valve 2 can be adjusted by the maximum sinking and floating stroke of the liquid inlet valve core 22. Therefore, the liquid inlet one-way valve 2 designed in this way can be closed in time before the flow peak occurs, and the pre-peak water saving effect is realized. In addition, liquid inlet valve core 22 is not restricted by a valve core reset structure, and liquid inlet valve core 22 can rotate freely, so that the self-cleaning performance is better. When the self-cleaning liquid outlet system is applied to the tooth flushing device, the endurance time of a liquid storage box of the tooth flushing device is prolonged, and the rhythm of water flow pulse is improved.

As shown in fig. 7, in order to assemble the liquid inlet valve core 22 of the liquid inlet check valve 2, the piston 12 includes a piston body 121 slidably engaged with the liquid pump chamber 11 and a piston head 122 provided at one end of the piston body 121; the liquid inlet valve cavity 21 is formed in the piston body 121 to open towards the liquid outlet cavity 14, the liquid inlet valve core 22 is limited and restricted by the piston head 122, and the overflowing limiting structure 24 is formed in the piston head 122.

As shown in fig. 7, in order to simplify the structure of the excess flow limiting structure 24, the excess flow limiting structure 24 includes an excess flow hole 241 opened in the piston head 122 and a valve core stopper ring 242 disposed in the excess flow hole 241. Specifically, the valve core stop ring 24 has a concave-convex structure or a curved structure, and there is no liquid sealing effect between the valve core stop ring 24 and the liquid inlet valve core 22.

In order to form the liquid inlet chamber 13, the piston 12 includes a piston body 121, and an annular groove is formed in an outer circumferential wall of the piston body 121, and the annular groove and the liquid pump chamber 11 jointly define the liquid inlet chamber 13. Specifically, the piston 12 has a substantially dumbbell shape.

As shown in fig. 5, 6 and 7, the piston 12 is provided with a first sealing ring 15 and a second sealing ring 16 respectively in fluid-tight fit with the liquid pump cavity 11, the first sealing ring 15 and the second sealing ring 16 are respectively located on the outer wall of the piston at two sides of the liquid inlet cavity 13, the first sealing ring 15 is close to the liquid outlet cavity 14, the second sealing ring 16 is far from the liquid outlet cavity 14, and the maximum sealing pressure of the first sealing ring 15 is greater than the maximum sealing pressure of the second sealing ring 16. The seal applied to the piston 12 is broken down from a conventional single seal into a high pressure seal and a low pressure seal. The first sealing ring 15 bears high pressure, but a small amount of leakage does not affect the work, so that the sealing requirement of the sealing ring bearing high pressure is reduced; the second sealing ring 16 does not allow leakage, but the working condition is improved and the service life is greatly prolonged due to the low working pressure. The tooth flushing device in the prior art only has the sealing ring of the high-pressure sealing ring, and the high-pressure sealing ring requires high sealing pressure and is not allowed to leak, so compared with the prior art, the technical scheme of the embodiment has the advantages that the performance requirement on the sealing ring is reduced, and the service life of the sealing ring is effectively prolonged.

As shown in fig. 4, in order to further improve the self-cleaning performance of the self-cleaning type liquid outlet system, the liquid outlet check valve 5 has no valve core resetting structure, the liquid outlet check valve 5 includes a liquid outlet valve cavity 51 formed inside the liquid pump cavity 11, a liquid outlet valve core 52 restrained in the liquid outlet valve cavity 51 in a floating manner, a liquid outlet valve seat 53 formed inside the liquid pump cavity 11 and located at one side of the liquid outlet valve cavity 51 close to the liquid outlet cavity 14, and a jet flow limiting structure 54 communicating the liquid outlet valve cavity 51 with the liquid outlet flow channel 4, the liquid outlet valve core 52 abuts against the jet flow limiting structure 54 when the piston 12 performs a liquid outlet stroke, and the liquid outlet valve core 52 abuts against the liquid outlet valve seat 53 when the piston 12 performs a liquid inlet stroke. The liquid outlet one-way valve 5 controls the closing time by controlling the lift and the flow area around the liquid outlet valve core 52.

Further, in order to simplify the structure of the jet limiting structure 54, the jet limiting structure 54 includes a jet hole 541 formed in the liquid pump cavity 11, and a valve core stopper 542 disposed on a wall of the jet hole 541 and protruding in a radial direction. Specifically, the number of the valve core stoppers 542 is plural, and all the valve core stoppers 542 are circumferentially arrayed with the axis of the jet hole 541 as a circle center line.

In order to facilitate the disassembly and assembly of the liquid pump device 1, the liquid pump cavity 11 comprises a liquid inlet adapter 111 and a liquid outlet adapter 112 embedded in the liquid inlet adapter 111, the liquid inlet adapter 111 is internally formed with the pump cavity, and the liquid outlet adapter 112 is formed with the liquid outlet flow channel 4.

As shown in fig. 5, in order to facilitate the liquid in the liquid inlet channel 3 to be smoothly introduced into the liquid inlet cavity 13, the liquid pump cavity 11 includes a liquid inlet adapter 111 and a piston pipe 113 embedded in the liquid inlet adapter 111, a liquid supply temporary storage cavity 111a communicated with the liquid inlet channel 3 is formed inside the liquid inlet adapter 111, and a plurality of communication holes 113a communicating the liquid inlet cavity 13 with the liquid supply temporary storage cavity 111a are formed on the piston pipe 113. Specifically, all the communication holes 113a are circumferentially arrayed around the axis of the piston tube 113.

In conclusion, the invention can not only save the installation space for the liquid inlet check valve, but also solve the problem of dirt storage and scale deposit caused by the valve core resetting structure, and especially can improve the self-cleaning property of the tooth flushing device. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.

The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Those skilled in the art can modify or change the above-described embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

Claims (10)

1. A self-cleaning type liquid outlet system is characterized by comprising:

the liquid pump device (1), the liquid pump device (1) includes the cavity of liquid pump (11) and piston (12), the piston (12) is set up in the pump cavity of the cavity of liquid pump (11) with reciprocating motion, the piston (12) divides the pump cavity into the invariable liquid inlet cavity (13) of volume and liquid outlet cavity (14) that the volume changes with the reciprocating motion of the piston (12), the inside of the piston (12) integrates and only allows the liquid in the liquid inlet cavity (13) to flow to the liquid outlet cavity (14) and enter the liquid check valve (2), enter the liquid check valve (2) and have no valve core to reset the structure and only rely on the reciprocating motion of the piston (12) to switch over the open and close state of oneself;

the liquid inlet flow channel (3), the liquid inlet flow channel (3) is communicated with the liquid inlet cavity (13);

the liquid outlet flow passage (4) is communicated with the liquid outlet cavity (14) through the liquid outlet one-way valve (5).

2. The self-cleaning type liquid outlet system according to claim 1, characterized in that: the liquid inlet check valve (2) comprises a liquid inlet valve cavity (21) formed inside a piston (12), a liquid inlet valve core (22) restrained in the liquid inlet valve cavity (21) in a floating mode, a liquid inlet valve seat (23) formed inside the piston (12) and located on one side, far away from the liquid outlet cavity (14), of the liquid inlet valve cavity (21), and an overflowing limiting structure (24) communicated with the liquid inlet valve cavity (21) and the liquid outlet cavity (14), wherein the liquid inlet valve seat (23) is provided with a overflowing hole (231) communicated with the liquid inlet valve cavity (21) and the liquid inlet cavity (13), the liquid inlet valve core (22) is abutted to the liquid inlet valve seat (23) when the piston (12) is used for liquid suction stroke, and the liquid inlet valve core (22) is separated from the liquid inlet valve seat (23) when the piston (12) is used for liquid suction stroke.

3. The self-cleaning type liquid outlet system according to claim 2, characterized in that: the piston (12) comprises a piston body (121) in sliding fit with the liquid pump cavity (11) and a piston head (122) arranged at one end of the piston body (121); the liquid inlet valve cavity (21) is formed in the piston body (121) in a manner of opening towards the liquid outlet cavity (14), the liquid inlet valve core (22) is limited and restricted by the piston head (122), and the overflowing limiting structure (24) is formed in the piston head (122).

4. The self-cleaning type liquid outlet system according to claim 3, characterized in that: the overflowing limiting structure (24) comprises an overflowing hole (241) formed in the piston head (122) and a valve core stop ring (242) arranged in the overflowing hole (241).

5. The self-cleaning type liquid outlet system according to claim 1, characterized in that: the piston (12) comprises a piston body (121), an annular groove (123) is formed in the outer peripheral wall of the piston body (121), and the annular groove (123) and the liquid pump cavity (11) jointly limit the liquid inlet cavity (13).

6. The self-cleaning type liquid outlet system according to claim 1, characterized in that: be equipped with respectively on piston (12) with liquid pump cavity (11) liquid tight complex first sealing washer (15) and second sealing washer (16), first sealing washer (15) and second sealing washer (16) are located the piston outer wall of feed liquor chamber (13) both sides respectively, and first sealing washer (15) are close to out sap cavity (14), and play sap cavity (14) are kept away from in second sealing washer (16), and the maximum seal pressure of first sealing washer (15) is greater than the maximum seal pressure of second sealing washer (16).

7. The self-cleaning type liquid outlet system according to claim 1, characterized in that: the liquid outlet one-way valve (5) comprises a liquid outlet valve cavity (51) formed in the liquid pump cavity (11), a liquid outlet valve core (52) restrained in the liquid outlet valve cavity (51) in a floating mode, a liquid outlet valve seat (53) formed in the liquid pump cavity (11) and located on one side, close to the liquid outlet cavity (14), of the liquid outlet valve cavity (51), and a jet flow limiting structure (54) communicating the liquid outlet valve cavity (51) with the liquid outlet flow channel (4), wherein the liquid outlet valve core (52) abuts against the jet flow limiting structure (54) when the piston (12) is in a liquid suction stroke, and the liquid outlet valve core (52) abuts against the liquid outlet valve seat (53) when the piston (12) is in a liquid suction stroke.

8. The self-cleaning type liquid outlet system according to claim 7, wherein: the jet flow limiting structure (54) comprises a jet flow hole (541) formed in the liquid pump cavity (11) and a valve core stop piece (542) which is arranged on the wall of the jet flow hole (541) and protrudes radially.

9. The self-cleaning type liquid outlet system according to claim 1, characterized in that: liquid pump cavity (11) include feed liquor adapter (111) and embedded play liquid adapter (112) in feed liquor adapter (111), and the inside shaping of feed liquor adapter (111) has the pump chamber goes up the shaping and has on play liquid adapter (112) go out liquid runner (4).

10. The self-cleaning type liquid outlet system according to claim 1, characterized in that: liquid pump cavity (11) are including feed liquor adapter (111) and embedded in piston pipe (113) of feed liquor adapter (111), and the inside shaping of feed liquor adapter (111) has the confession liquid chamber of keeping in (111 a) that communicates with feed liquor runner (3), is equipped with on piston pipe (113) with feed liquor chamber (13) and confession liquid chamber of keeping in (111 a) a plurality of intercommunicating pores (113 a) that communicate.

Images