CN219345586U - Built-in no outer tube ball axle backflow preventer drainage structure - Google Patents

Abstract

The utility model discloses a built-in outer-tube-free ball-shaft backflow preventer drainage structure, which relates to the field of valves and comprises a main body, wherein a water inlet and a water outlet are formed in the main body, and a water inlet cavity, a middle cavity and a water outlet cavity are sequentially formed in the main body in the direction from the water inlet to the water outlet; the main body is also internally provided with a drain valve seat for placing a drain valve seat, the inner cavity of the drain valve seat is communicated with the water inlet cavity, the bottom of the inner cavity is provided with a drain outlet, and the inner cavity is opened and closed by a drain valve core under the control of the drain outlet; the outer wall of the drainage valve seat is axially provided with a plurality of channels, the tail end of each channel is provided with an inner cavity communicating hole for communicating the drainage cavity and the inner cavity, and the drainage cavity is communicated with the middle cavity through the middle cavity communicating hole. According to the utility model, the water discharge valve is additionally arranged on the structure of the two-stage check valve, so that automatic water discharge and water discharge are realized, and water pollution caused by water pouring is effectively prevented; the valve rod can be locked at the positioning hole by means of the locking nut, so that the drain valve core always keeps sealing of the drain outlet, and the valve rod is suitable for a scene without automatic drainage.

Description

Built-in no outer tube ball axle backflow preventer drainage structure

Technical Field

The utility model relates to the field of valves, in particular to a drain structure of a built-in non-outer tube ball shaft backflow preventer.

Background

The water supply pipeline of tap water is connected with a plurality of water faucets and water consuming devices such as water heater, washing machine, toilet water tank and the like at the terminal of the water supply pipeline of tap water, and after the water consuming devices are closed, accumulated water is remained in the inner cavity and the pipeline, if the water consuming devices are not opened for a long time for use, a large amount of bacteria can be bred in the accumulated water, and if the water consuming devices which are not in accordance with the standard of drinking water are used, rust and spot sewage can be generated. When the tap water pipe network in a certain area is in an abnormal state, for example, the water supply pipe bursts or the main pipe water is closed, accumulated water in the inner cavity of the tap and the inner cavities of other water appliances can flow back into the drinking water pipe network in the area without blocking, so that the drinking water source in the area is polluted in a large area, and the health of people is seriously damaged.

Because the terminal pipeline pipe diameter is little, general valve adopts screw pipeline to connect, at present generally adopts single check valve, or two-stage check valve prevents water refluence, and although the check valve prevents water refluence to a certain extent, nevertheless can't prevent the pollution of flowing water down, because the check valve just probably causes the instantaneous water pollution in closing time.

The backflow preventer is an effective device for preventing backflow and pollution of water by pipeline water supply. For example, chinese patent document CN211231721U discloses a backflow preventer with an annular built-in drainer, comprising a valve body, wherein a cylindrical drain sealing piston, a water inlet valve flap, and a water outlet valve flap are sequentially arranged inside the valve body from front to back along the direction from a water inlet to a water outlet; a pre-tightening spring is arranged between the water discharge sealing piston and the front inner end surface of the valve body, a main spring is arranged between the water outlet valve clack and the rear inner end surface of the valve body, and water passing through holes are coaxially arranged in the middle of the water discharge sealing piston and the middle of the water outlet valve clack; the water inlet valve clack coaxially penetrates through the guide sleeve in the valve body, the front end of the water inlet valve clack is provided with a limiting step, and the outer diameters of the front end and the rear end of the water inlet valve clack are both larger than the water through hole for sliding sealing the water through hole; the periphery of the guide sleeve is an annular valve channel, the periphery of the front end of the valve channel is an annular drainer channel and is separated by a cylinder wall, and a drain port which is closed when a drain sealing piston moves backwards and abuts against the front end surface of the cylinder wall is arranged at the periphery of the drainer channel. The following drawbacks are common in the prior art, taking this structure as an example:

1. the drainer only has a backflow drainage function, and cannot be actively sealed when the drainer is applied to a scene without automatic drainage;

2. the drainer (or drain valve) conducts water by virtue of the valve core instead of the valve seat, and the valve core is easy to be blocked or damaged after long-time use, so that the backflow drainage function is invalid or the valve is leaked;

3. once the drainer or the valve fails, the drainer or the valve must be replaced entirely, and the valve seat and the valve core cannot be detached independently for replacement.

Disclosure of Invention

The utility model aims to overcome the defects in the prior art, and provides a built-in non-outer-tube ball-shaft backflow preventer drainage structure, which adopts a channel on the outer wall of a valve seat to conduct water, has better water conduction effect and long service life, and can manually lock a drainage outlet when automatic drainage is not needed.

The utility model aims at being completed by the following technical scheme: the built-in outer-tube-free ball-shaft backflow preventer drainage structure comprises a main body, wherein a water inlet and a water outlet opposite to the water inlet are formed in the main body, a water inlet cavity, a middle cavity and a water outlet cavity are sequentially formed in the main body in the direction from the water inlet to the water outlet, the water inlet cavity and the middle cavity are communicated or sealed through a water inlet valve clack, and the middle cavity and the water outlet cavity are communicated or sealed through a water outlet valve clack; the main body is internally provided with a water draining cavity, a water draining valve seat is arranged in the water draining cavity, the water draining valve seat is provided with an inner cavity in a penetrating way, the top of the inner cavity is communicated with the water inlet cavity through a water inlet cavity communicating hole, the bottom of the inner cavity is provided with a water draining outlet, the inner cavity of the water draining valve seat is provided with a water draining valve core in a sliding way through a spring, and the water draining valve core is used for controlling the water draining outlet at the bottom of the water draining valve seat to be opened or closed; the outer wall of the top of the drain valve seat is axially provided with a plurality of channels, and the tail end of each channel is provided with an inner cavity communication hole for communicating the drain cavity with the inner cavity, and the drain cavity is communicated with the middle cavity through the middle cavity communication hole.

As a further technical scheme, the drainage valve core comprises a valve rod, a ball body arranged at the top of the valve rod and a piston arranged at the top of the ball body, and the piston slides up and down along the wall of the inner cavity; the sealing ring mounting groove and the spring mounting groove are sequentially formed in the inner cavity wall below the inner cavity communication hole, the drainage sealing ring is placed in the sealing ring mounting groove and used for being matched with the ball body to seal, so that the drainage outlet is opened or closed, one end of the spring is propped against the ball body, and the other end of the spring is supported in the spring mounting groove, so that the drainage outlet is in an opened state in a natural state.

As a further technical scheme, the center of the water outlet is provided with a positioning hole for the valve rod to pass through and position, and the lower end of the valve rod is connected with a locking nut in a threaded manner and is used for locking the valve rod by matching with the positioning hole.

As a further technical scheme, the drain valve seat is tightly propped in the drain cavity through the locking joint, and the locking joint sleeved on the periphery of the drain outlet is in sealing connection with the bottom of the drain cavity.

As a further technical scheme, the outer circumference of the top of the drain valve seat is provided with a chamfer, so that a gap exists between the top of the drain valve seat and the drain cavity, and each channel is communicated with the middle cavity communication hole through the gap.

As a further technical scheme, the top of the inner cavity is provided with a clamp spring groove for placing a clamp spring, and the clamp spring is used for stopping the piston.

As a further technical scheme, the channels are grooves or holes uniformly distributed along the outer circumference of the drain valve seat.

As a further technical scheme, the ball body and the valve rod are integrally formed or formed by threaded connection, and the piston and the ball body are integrally formed or formed by a split structure.

As a further technical scheme, the main body comprises a water inlet section and a water outlet section which is connected with the water inlet section in a sealing way, the water inlet is formed in the water inlet section, and the water outlet is formed in the water outlet section.

As a further technical scheme, the inlet valve clack is arranged on the sealing surface of the inlet cavity, a supporting disc is arranged between the middle cavity and the outlet cavity in a sealing way, one end of a spring of the inlet valve clack is supported on the supporting disc, and the other end of the spring of the inlet valve clack is arranged on the inlet valve clack; the water outlet valve clack is arranged on the sealing surface of the supporting disc, one end of the water outlet valve clack spring is arranged on the water outlet valve clack, and the other end of the water outlet valve clack spring is supported on the inner wall of the water outlet section.

The beneficial effects of the utility model are as follows:

1. a drainage valve is added on the structure of the two-stage check valve, so that automatic water outlet and drainage are realized, and water pollution caused by water pouring is effectively prevented;

2. the valve rod of the drain valve is guided and positioned by the positioning hole, so that the drain valve is ensured to be used smoothly, and the valve rod can be locked at the positioning hole by the locking nut, so that the drain valve core always keeps sealing the drain outlet, and the valve rod is used as a conventional two-stage check valve and can be applied to a scene without automatic drainage;

3. the drainage valve seat is arranged in the drainage cavity through the locking joint, so that the drainage valve core and the drainage valve seat are convenient to detach, and meanwhile, the ball body, the valve rod and the piston can adopt split type or integral type structures, and can be flexibly replaced when the drainer or the valve fails.

Drawings

Fig. 1 is a schematic diagram of a front view structure of the present utility model.

Fig. 2 is a cross-sectional view A-A of fig. 1.

Fig. 3 is a schematic diagram of a front view structure of a water inlet section in the present utility model.

Fig. 4 is a B-B cross-sectional view of fig. 3.

Fig. 5 is a schematic perspective view of a drain valve seat according to the present utility model.

FIG. 6 is a schematic top view of a drain valve seat according to the present utility model.

Fig. 7 is a C-C cross-sectional view of fig. 6.

Fig. 8 is a cross-sectional view showing a structure of a drain valve seat employing a channel of a slot type in the present utility model.

Fig. 9 is a D-D cross-sectional view of fig. 8.

Fig. 10 is a sectional view of E-E of fig. 8.

Fig. 11 is a cross-sectional view of F-F of fig. 8.

Fig. 12 is a cross-sectional view showing a drain valve seat structure employing a hole-type passage in the present utility model.

Fig. 13 is a G-G cross-sectional view of fig. 12.

Fig. 14 is a sectional view H-H of fig. 12.

FIG. 15 is a schematic view of a ball and valve stem structure according to the present utility model.

FIG. 16 is a schematic view of an integrated ball and stem structure used in the present utility model.

Fig. 17 is a schematic view of a drain valve core structure according to the present utility model.

Fig. 18 is a schematic view of a drain valve core structure of the present utility model.

FIG. 19 is a schematic view of the flow of water during operation of the present utility model.

Fig. 20 is an enlarged partial view of the area I of fig. 19 (water inlet is pressurized with water).

Fig. 21 is a partially enlarged schematic view of the region I in fig. 19 (water inlet pressureless and water-free state).

Fig. 22 is a partially enlarged schematic view of the region I in fig. 19 (drain port sealing state).

Reference numerals illustrate: the water draining valve comprises a main body 1, a clamp spring groove 2, a piston 3, a draining valve core 4, a draining valve seat 5, a spring 6, a locking joint 7, a clamp spring 8, a draining sealing ring 9, a water inlet cavity communicating hole 10, a middle cavity communicating hole 11, a locking nut 12, a ball 13, a valve rod 14, a chamfer 15, a channel 16, a water inlet 17, a water outlet 18, a water inlet valve clack 19, a water outlet valve clack 20, a water inlet section 21, a water outlet section 22, a sealing ring mounting groove 23, a spring mounting groove 24, a water inlet cavity 25, a middle cavity 26, a water outlet cavity 27, a cavity communicating hole 28, a draining outlet 29, a positioning hole 30, a cavity 31, a supporting disc 32, a water inlet valve clack spring 33, a water outlet valve clack spring 34 and a draining cavity 35.

Detailed Description

The utility model will be described in detail below with reference to the attached drawings:

examples: as shown in the attached drawings 1-22, the drainage structure of the built-in non-outer-tube ball-shaft backflow preventer comprises a main body 1, a clamp spring groove 2, a piston 3, a drainage valve core 4, a drainage valve seat 5, a spring 6, a locking joint 7, a clamp spring 8, a drainage sealing ring 9, a water inlet cavity communication hole 10, a middle cavity communication hole 11, a locking nut 12, a ball 13, a valve rod 14, a chamfer 15, a channel 16, a water inlet 17, a water outlet 18, a water inlet valve clack 19, a water outlet valve clack 20, a water inlet section 21, a water outlet section 22, a sealing ring mounting groove 23, a spring mounting groove 24, a water inlet cavity 25, a middle cavity 26, a water outlet cavity 27, an inner cavity communication hole 28, a water outlet 29, a positioning hole 30, an inner cavity 31, a supporting disc 32, a water inlet valve clack spring 33, a water outlet valve clack spring 34 and a drainage cavity 35.

Referring to fig. 2, a water inlet section 21 (provided with a water inlet 17) is provided on the left side of the main body 1, a water outlet section 22 (provided with a water outlet 18 opposite to the water inlet 17) is provided on the right side of the main body 1, and the water inlet section 21 and the water outlet section 22 are in threaded connection and sealed by a sealing ring. The main body 1 is internally provided with a water inlet cavity 25, a middle cavity 26 and a water outlet cavity 27 in sequence from left to right (in the direction from the water inlet 17 to the water outlet 18), the water inlet valve clack 19 is arranged on the sealing surface of the water inlet cavity 25, and a supporting disc 32 is arranged between the middle cavity 26 and the water outlet cavity 27 in a sealing way. The right end of the water inlet valve clack spring 33 is supported on the support plate 32 through a bracket, and the left end of the water inlet valve clack spring 33 is arranged on the water inlet valve clack 19. The water outlet valve clack 20 is arranged on the sealing surface of the supporting disc 32, the left end of the water outlet valve clack spring 34 is arranged on the water outlet valve clack 20, and the right end of the water outlet valve clack spring 34 is supported on the inner wall of the water outlet section 22. When water pressure exists at the water inlet 17, water flows into the water inlet cavity 25 and pushes the water inlet valve clack 19, the water inlet valve clack spring 33 is gradually compressed, the sealing surface of the water inlet cavity 25 is opened, and the water flows into the middle cavity 26; the water flow then continues to push the water outlet flap 20, the water outlet flap spring 34 is gradually compressed, the sealing surface of the support disk 32 is opened, and the water flow enters the water outlet cavity 27 and flows out of the water outlet 18. When the water pressure at the water inlet 17 disappears, the water inlet valve clack spring 33 and the water outlet valve clack spring 34 return automatically, and the sealing surface is closed to realize double-stage check.

As shown in fig. 4, 5 and 7, the main body 1 is further provided with a drain cavity 35, the drain cavity 35 is internally provided with a drain valve seat 5, the center of the drain valve seat 5 is provided with an inner cavity 31 in a penetrating manner, as shown in fig. 20, the top (upper opening) of the inner cavity 31 is communicated with the water inlet cavity 25 through a water inlet cavity communication hole 10, the bottom of the inner cavity 31 is provided with a drain outlet 29, the inner cavity 31 of the drain valve seat 5 is slidably provided with a drain valve core 4 through a spring 6, and the drain valve core 4 can control the drain outlet 29 at the bottom of the drain valve seat 5 to be opened or closed. As shown in fig. 5, four channels 16 are axially formed on the outer wall of the top of the drain valve seat 5, and an inner cavity communication hole 28 is formed at the end of each channel 16 for communicating the drain cavity 35 with the inner cavity 31, and the drain cavity 35 is communicated with the middle cavity 26 through the middle cavity communication hole 11.

Further, referring to fig. 20, the drain valve core 4 includes a valve stem 14, a ball 13 disposed at the top of the valve stem 14, and a piston 3 disposed at the top of the ball, and the piston 3 can slide up and down along the inner wall of the inner chamber 31. As shown in fig. 7, the wall of the inner chamber 31 below the inner chamber communication hole 28 is provided with a seal ring mounting groove 23 and a spring mounting groove 24 in sequence, and the drain seal ring 9 is placed in the seal ring mounting groove 23 and can be sealed by matching with the ball 13, so that the drain outlet 29 is opened or closed. The upper end of the spring 6 is supported on the ball 13 and the lower end is supported on the spring mounting groove 24, so that the ball 13 is separated from the drain sealing ring 9 under the action of the spring 6 in a natural state (namely, when the piston 3 is not pressed), and the drain outlet 29 is in an open state.

As shown in fig. 11, a positioning hole 30 is provided at the center of the drain port 29 for the valve rod 14 to pass through and position, the lower end of the valve rod 14 is connected with a locking nut 12 by screw thread, after the locking nut 12 is screwed, the valve rod 14 can be locked at the positioning hole 30 and cannot move upwards, at this time, the ball 13 is always in contact with the drain sealing ring 9 for sealing, and the drain port 29 is in a normally sealed state.

Referring to fig. 5 and 7, the outer circumference of the top of the drain valve seat 5 is provided with a chamfer 15 so that a gap exists between the top of the drain valve seat 5 and the drain chamber 35, through which each passage 16 can communicate with the intermediate chamber communication hole 11, and water in the intermediate chamber 26 enters the inner chamber 31 along the intermediate chamber communication hole 11, the passage 16, and the inner chamber communication hole 28 to be discharged from the drain port 29.

Preferably, the top of the inner cavity 31 is provided with a clamp spring groove 2 for placing a clamp spring 8, and the clamp spring 8 can stop the piston 3 and limit the upward movement stroke of the piston 3. The drain valve seat 5 is tightly propped in the drain cavity 35 through the locking joint 7, the locking joint 7 is sleeved on the periphery of the drain port 29, and the locking joint 7 is in sealing (threaded) connection with the bottom of the drain cavity 35.

As shown in fig. 9 and 10, the four channels 16 are of a groove-shaped structure uniformly distributed along the outer circumference of the drain valve seat 5, and the lower ends of the groove-shaped structure are communicated with the inner cavity communication holes 28. Further, as shown in fig. 13 and 14, the four channels 16 may have a hole structure uniformly distributed along the outer circumference of the drain valve seat 5, and the lower end of the hole structure is connected to the inner cavity communication hole 28.

Preferably, referring to fig. 15, the ball 13 is threadably connected to the valve stem 14, and the valve stem 14 is a stud. As shown in fig. 16, the ball 13 and the valve rod 14 may be of an integral structure, and an external thread is provided at the lower end of the valve rod 14, so as to facilitate installation of the locking nut 12. In addition, as shown in fig. 17 and 18, the piston 3 and the ball 13 are integrally formed or are in a split structure, and are flexibly selected according to actual requirements.

The working process of the utility model comprises the following steps: as shown in fig. 19 and 20 (the direction indicated by the arrow in the figure is the water flow direction), when water is pressurized at the water inlet 17, water flows into the water inlet cavity 25 and pushes the water inlet valve clack 19, the water inlet valve clack spring 33 is gradually compressed, so that the sealing surface of the water inlet cavity 25 is opened, and water flows into the middle cavity 26; the water flow then continues to push the water outlet flap 20, the water outlet flap spring 34 is gradually compressed, the sealing surface of the support disk 32 is opened, and the water flow enters the water outlet cavity 27 and flows out of the water outlet 18. Meanwhile, part of water flow enters the inner cavity 31 of the drain valve seat 5 through the water inlet cavity communication hole 10 and pushes the piston 3 to enable the steel ball 13 to be in contact with and seal with the drain sealing ring 9, and the drain outlet 29 is automatically sealed, namely, no water is discharged from the drain outlet 29 during normal water outlet.

When no pressure and water exist at the water inlet 17, the water inlet valve clack spring 33 and the water outlet valve clack spring 34 return automatically, and the sealing surface is closed to realize double-stage check. At this time, as shown in fig. 21, the spring 6 is reset, the piston 3 moves upwards under the action of the ball 13 until being stopped by the snap spring 8, the ball 13 is separated from the drain sealing ring 9, and the drain outlet 29 is opened; the residual water flow in the middle chamber 26 enters the inner chamber 31 along the middle chamber communication hole 11, the channel 16 and the inner chamber communication hole 28 and finally is discharged from the water outlet 29.

As shown in fig. 22, by manually tightening the lock nut 12, the valve rod 14 is locked in the positioning hole 30 and cannot move upward, and at this time, the ball 13 is always in contact with and sealed with the drain seal ring 9, and the drain port 29 is in a normally sealed state, so that the valve is suitable for a scene where automatic drainage is not required.

It should be understood that equivalents and modifications to the technical scheme and the inventive concept of the present utility model should fall within the scope of the claims appended hereto.

Claims (10)

1. The utility model provides an interior no outer tube ball axle backflow preventer drainage structures which characterized in that: the water inlet valve comprises a main body (1), wherein a water inlet (17) and a water outlet (18) opposite to the water inlet (17) are formed in the main body (1), a water inlet cavity (25), a middle cavity (26) and a water outlet cavity (27) are sequentially formed in the main body (1) in the direction from the water inlet (17) to the water outlet (18), the water inlet cavity (25) and the middle cavity (26) are communicated or sealed under the control of a water inlet valve clack (19), and the middle cavity (26) and the water outlet cavity (27) are communicated or sealed under the control of a water outlet valve clack (20); a water draining cavity (35) is further formed in the main body (1), a water draining valve seat (5) is arranged in the water draining cavity (35), an inner cavity (31) is formed in the water draining valve seat (5) in a penetrating mode, the top of the inner cavity (31) is communicated with the water inlet cavity (25) through a water inlet cavity communication hole (10), a water draining outlet (29) is formed in the bottom of the inner cavity (31), a water draining valve core (4) is slidably mounted in the inner cavity (31) of the water draining valve seat (5) through a spring (6), and the water draining outlet (29) in the bottom of the water draining valve seat (5) is controlled to be opened or closed; a plurality of channels (16) are axially arranged on the outer wall of the top of the drainage valve seat (5), and an inner cavity communication hole (28) is arranged at the tail end of each channel (16) and is used for communicating a drainage cavity (35) and an inner cavity (31), and the drainage cavity (35) is communicated with the middle cavity (26) through the middle cavity communication hole (11).

2. The drain structure of the built-in non-outer-tube ball-shaft backflow preventer according to claim 1, wherein: the drainage valve core (4) comprises a valve rod (14), a ball body (13) arranged at the top of the valve rod (14) and a piston (3) arranged at the top of the ball body, and the piston (3) slides up and down along the wall of the inner cavity (31); the sealing ring mounting groove (23) and the spring mounting groove (24) are sequentially formed in the wall of the inner cavity (31) below the inner cavity communication hole (28), the water draining sealing ring (9) is arranged in the sealing ring mounting groove (23) and used for being matched with the ball body (13) to seal, so that the water draining opening (29) is opened or closed, one end of the spring (6) is propped against the ball body (13), and the other end of the spring is supported in the spring mounting groove (24), so that the water draining opening (29) is in an opened state in a natural state.

3. The drain structure of the built-in non-outer-tube ball-shaft backflow preventer according to claim 2, wherein: the center of the water outlet (29) is provided with a positioning hole (30) for the valve rod (14) to pass through and be positioned, the lower end of the valve rod (14) is connected with a locking nut (12) in a threaded manner, and the locking nut is used for locking the valve rod (14) by matching with the positioning hole (30).

4. The drain structure of the built-in non-outer-tube ball-shaft backflow preventer according to claim 3, wherein: the drain valve seat (5) is tightly propped in the drain cavity (35) through the locking joint (7), and the locking joint (7) sleeved on the periphery of the drain outlet (29) is connected with the bottom of the drain cavity (35) in a sealing way.

5. The drain structure of the built-in non-outer-tube ball-shaft backflow preventer of claim 4, wherein: the outer circumference of the top of the drain valve seat (5) is provided with a chamfer (15) so that a gap exists between the top of the drain valve seat (5) and the drain cavity (35), and each channel (16) is communicated with the middle cavity communication hole (11) through the gap.

6. The drain structure of the built-in non-outer-tube ball-shaft backflow preventer of claim 5, wherein: the top of the inner cavity (31) is provided with a clamp spring groove (2) for placing a clamp spring (8), and the clamp spring (8) is used for stopping the piston (3).

7. The drain structure of the built-in non-outer-tube ball-shaft backflow preventer of claim 6, wherein: the channels (16) are grooves or holes uniformly distributed along the outer circumference of the drain valve seat (5).

8. The drain structure of the built-in non-outer-tube ball-shaft backflow preventer of claim 7, wherein: the ball body (13) and the valve rod (14) are integrally formed or are formed by threaded connection, and the piston (3) and the ball body (13) are integrally formed or are of a split type structure.

9. The drain structure of the built-in non-outer-tube ball-shaft backflow preventer of claim 8, wherein: the main body (1) comprises a water inlet section (21) and a water outlet section (22) which is connected with the water inlet section (21) in a sealing way, the water inlet (17) is formed in the water inlet section (21), and the water outlet (18) is formed in the water outlet section (22).

10. The drain structure of the built-in non-outer-tube ball-shaft backflow preventer of claim 9, wherein: the water inlet valve clack (19) is arranged on the sealing surface of the water inlet cavity (25), a supporting disc (32) is arranged between the middle cavity (26) and the water outlet cavity (27) in a sealing way, one end of a water inlet valve clack spring (33) is supported on the supporting disc (32), and the other end of the water inlet valve clack spring is arranged on the water inlet valve clack (19); the water outlet valve clack (20) is arranged on the sealing surface of the supporting disc (32), one end of the water outlet valve clack spring (34) is arranged on the water outlet valve clack (20), and the other end of the water outlet valve clack spring is supported on the inner wall of the water outlet section (22).

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