CN220151994U - Tap inner core and kitchen tap - Google Patents

Abstract

The utility model discloses a tap inner core and a kitchen tap, which comprise a valve core seat and a hard connecting pipe; the lower end of the valve core seat is provided with a water flow inlet which is arranged downwards; the upper end of the valve core seat is provided with an upward water outflow port; the lower end of the hard connecting pipe is fixedly connected with the water outlet, and the upper end of the hard connecting pipe is communicated with a water outlet pipe of the faucet; a clamping seat is formed on the side part of the valve core seat; the clamping seat is provided with a valve core propping end face; a kitchen tap comprising a tap shell and a valve core main body; a valve core mounting cylinder is formed on the side part of the faucet shell; a mounting seat is arranged in the valve core mounting cylinder; the faucet inner core is also included; the utility model is connected with the water outflow port on the valve core seat through the hard connecting pipe, and the upper end of the hard connecting pipe is connected with the water outlet pipe to outflow water. The clamping seat on the valve core seat is used for being connected with the faucet shell, so that the valve core seat is installed in the faucet shell of the existing drawing faucet and hard connection is realized, the production of the kitchen faucet is realized, and the production cost of products is reduced.

Description

Tap inner core and kitchen tap

Technical Field

The utility model relates to the technical field of bathroom, in particular to a tap inner core and a kitchen tap.

Background

The water outlet end of the water tap is also connected with an upward extending water outlet pipe, water flows upwards after passing through the water outlet end of the valve core, and finally flows out from a higher position (called a kitchen tap) through the water outlet pipe; a drawing tap is also commonly used on a kitchen sink, the water outlet end of the valve core is connected with a hose, a heavy hammer is arranged on the hose, and the drawing tap which is convenient for assembling an inner core is reset by utilizing the pulling force generated by the gravity of the heavy hammer (such as a valve core of CN216009630U, a drawing tap using the valve core and a drawing tap of CN 210423882U); because the kitchen tap and the drawing tap have different flow passages, even the appearance style of the tap shell is the same, the tap shell needs to be produced separately, and the kitchen tap and the drawing tap cannot be used commonly. How to use the existing drawing tap shell to realize the production of adapting to the traditional kitchen tap becomes the key point of enterprise research and development.

In view of the above, the present inventors have made intensive studies to solve the above-mentioned drawbacks of the prior art.

Disclosure of Invention

The utility model mainly aims to provide a tap inner core and a kitchen tap, which solve the problem that the existing drawing tap shell is difficult to be used for producing the kitchen tap with water flow directly upwards to a water outlet pipe. The production cost of the kitchen faucet is reduced.

In order to achieve the above object, the solution of the present utility model is:

a tap inner core, which comprises a valve core seat and a hard connecting pipe; the lower end of the valve core seat is provided with a water flow inlet which is arranged downwards; the upper end of the valve core seat is provided with an upward water outlet; the lower end of the hard connecting pipe is fixedly connected with the water outlet, and the upper end of the hard connecting pipe is communicated with a water outlet pipe of the faucet; a clamping seat is formed on the side part of the valve core seat; the clamping seat is provided with a valve core propping end face; a water inlet water hole and a water outlet water hole are formed on the propping end surface of the valve core; the water inlet water passing hole and the water outlet water passing hole are respectively communicated with the water inlet and the water outlet.

Further, the water inlet comprises a cold water inlet and a hot water inlet; the water inlet water passing holes comprise cold water passing holes and hot water passing holes; the cold water passing hole and the hot water passing hole are respectively communicated with the cold water inlet and the hot water inlet.

Further, an annular groove is arranged on the valve core seat at one side of the clamping seat, which is away from the abutting end surface of the valve core.

Further, the hard connecting pipe is a straight pipe, and the axis of the hard connecting pipe is perpendicular to the normal line of the propping end surface of the valve core.

Further, a first external thread is arranged at the lower end of the hard connecting pipe, a first internal thread is arranged at the water outlet, and the hard connecting pipe is in locking connection with the water outlet through threads; an inner hexagonal countersink is arranged at the upper part of the inner cavity of the hard connecting pipe.

Furthermore, the hard connecting pipe and the valve core seat are made of copper materials.

Further, a sealing groove is formed in the upper portion of the outer side wall of the hard connecting pipe, and a sealing ring is arranged in the sealing groove; the rotary joint is also included; the rotary joint comprises an inner joint and a rotary sleeve, and the rotary sleeve is rotationally connected to the outer side of the inner joint; a water passing cavity which penetrates up and down is formed in the inner joint; the water passing cavity is provided with a sliding cavity which is in sliding connection with the sealing ring, and the sliding cavity is communicated with the lower end face of the inner joint.

Further, a plurality of sealing grooves are arranged at intervals along the axial direction, and sealing rings are arranged in each sealing groove; the lower part of the inner joint is provided with a second external thread.

A kitchen faucet comprises a faucet shell and a valve core main body; a valve core mounting cylinder is formed on the side part of the faucet shell; a mounting seat is arranged in the valve element mounting cylinder; the faucet inner core is also included; the clamping seat is clamped on the mounting seat; the valve core main body is arranged in the valve core mounting cylinder and is in propping contact with the valve core propping end surface; the lower end of the hard connecting pipe is fixedly connected with the water outlet; the upper end of the hard connecting pipe is communicated with a water outlet pipe of the faucet.

A kitchen faucet comprises a faucet shell, a valve core main body, a valve core seat, a hard connecting pipe and a rotary joint; a valve core mounting cylinder is formed on the side part of the faucet shell, and a mounting seat is arranged in the valve core mounting cylinder; a second internal thread is arranged in the upper end opening of the faucet shell;

the lower end of the valve core seat is provided with a cold water inlet and a hot water inlet which are arranged downwards; the upper end of the valve core seat is provided with an upward mixed water outlet; a clamping seat is formed on the side part of the valve core seat; the clamping seat is provided with a valve core propping end face; a cold water passing hole, a hot water passing hole and a mixed water passing hole are formed on the propping end surface of the valve core; the cold water passing hole, the hot water passing hole and the mixed water passing hole are respectively communicated with the cold water inlet, the hot water inlet and the mixed water outlet;

the clamping seat is clamped on the mounting seat; the lower end of the hard connecting pipe is in threaded connection with the mixed water outlet; the valve core main body is arranged in the valve core mounting cylinder and is in propping contact with the valve core propping end surface; a plurality of sealing grooves are formed in the upper part of the outer side wall of the hard connecting pipe at intervals, and a sealing ring is arranged in each sealing groove;

the rotary joint comprises an inner joint and a rotary sleeve, and the rotary sleeve is rotationally connected to the outer side of the inner joint; a water passing cavity which penetrates up and down is formed in the inner joint; the water passing cavity is provided with a sliding cavity which is in sliding connection with the sealing ring, and the sliding cavity is communicated with the lower end face of the inner joint; the lower part of the inner joint is provided with a second external thread; the second external thread is in locking connection with the second internal thread.

After the structure is adopted, the faucet inner core and the kitchen faucet have the following beneficial effects:

1. the faucet inner core is arranged in the faucet shell, water flows in through the water flow inlet at the lower end of the valve core seat, the water inlet water hole and the water outlet water hole are used for being connected with the valve core main body, and the water flow controlled by the valve core main body flows into the inner cavity of the hard connecting pipe through the water outlet at the top of the valve core seat and flows out upwards through the water outlet pipe; in order to facilitate the installation of the hard connecting pipe and the valve core seat, the hard connecting pipe and the valve core seat are independently manufactured and then are locked together in the faucet shell. The valve core seat is provided with a clamping seat, so that the valve core seat can be clamped in a faucet shell of the existing pull faucet to realize installation. The length of the hard connecting pipe can be adjusted during manufacturing according to the height parameter of the faucet shell.

2. When the valve is a single-cooled tap, only one water flow inlet is arranged at the lower part of the valve core seat, and the valve core main body connected to the top end surface of the valve core is a single-cooled valve core. When the valve core is a cold and hot water mixing tap, a cold water inlet and a hot water inlet are arranged at the lower part of the valve core seat, and a cold water through hole and a hot water inlet are arranged on the corresponding valve core propping end surface; the valve core main body connected to the valve core propping end face is a water mixing valve core. The normal line of the valve core propping top end surface can be perpendicular to the axis of the hard connecting pipe or form an obtuse angle or an acute angle so as to adapt to different faucet shell styles.

3. The upper end of the hard connecting pipe is connected with a rotary joint, and the rotary joint is arranged on the faucet shell to be connected with a water outlet pipe, so that the water outlet pipe can smoothly rotate relative to the faucet shell. The sliding cavity is arranged in the inner joint of the rotary joint, so that the upper part of the hard connecting pipe can slide in the sliding cavity, and even if a certain error exists in the height of the faucet shell, the sliding of the hard connecting pipe and the sliding cavity can be corrected, and the hard connecting pipe and the rotary joint can be connected. And set up the sliding chamber, when the second external screw thread of nipple and tap casing threaded connection, along with the rotation of nipple, the nipple moves down for the tap casing, and the sealing washer on the upper portion of stereoplasm connecting pipe slides in the sliding chamber this moment, guarantees the normal rotation when the screw thread rotates the connection.

4. The valve core main body is arranged in the valve core mounting cylinder and abuts against the valve core abutting end surface, so that the clamping seat of the valve core seat can abut against the mounting seat in the faucet shell, and the fixation of the valve core seat is realized.

Compared with the prior art, the utility model has the advantages that the water outflow port on the valve core seat is connected through the hard connecting pipe, and the upper end of the hard connecting pipe is connected with the water outlet pipe to outflow water. The clamping seat on the valve core seat is used for being connected with the faucet shell, so that the valve core seat is installed in the faucet shell of the existing drawing faucet and hard connection is realized, the production of the kitchen faucet is realized, and the production cost of products is reduced.

Drawings

Fig. 1 is a schematic perspective view of a faucet core according to the present utility model.

Fig. 2 is a schematic exploded view of the faucet core.

Fig. 3 is a schematic cross-sectional view of a kitchen faucet according to the present utility model.

Fig. 4 is an exploded view of the kitchen faucet.

FIG. 5 is a schematic cross-sectional exploded view of a kitchen faucet.

Fig. 6 is a schematic view of a kitchen faucet in a perspective view, cut away in a horizontal direction.

In the figure:

a valve core seat 1; a water flow inlet 11; a cold water inlet 111; a hot water inlet 112; a water outflow port 12; a first internal thread 121; a clamping seat 13; the valve core abuts against the top end surface 14; a water inlet water through hole 15; a cold water passing hole 151; a hot water passing hole 152; a water outlet hole 153; a positioning hole 154; an annular groove 16;

a hard connecting pipe 2; a first external thread 21; an inner hexagonal countersink 22; a seal ring 23; a rotary joint 3; an inner joint 31; a sliding cavity 311; a second external thread 312; a rotating sleeve 32; a faucet housing 4; a second internal thread 41; a spool mounting cylinder 42; a mounting block 421; a valve body 5; against the ring 51.

Detailed Description

In order to further explain the technical scheme of the utility model, the utility model is explained in detail by specific examples.

As shown in fig. 1 to 6, which are a kind of a faucet core according to the present utility model, the faucet core includes a valve core seat 1 and a hard connection pipe 2; the lower end of the valve core seat 1 is provided with a water flow inlet 11 which is arranged downwards; the upper end of the valve core seat 1 is provided with an upward water outflow port 12; the lower end of the hard connecting pipe 2 is fixedly connected with the water outlet 12, and the upper end of the hard connecting pipe 2 is communicated with a water outlet pipe (not shown in the figure) of a water tap; a clamping seat 13 is formed on the side part of the valve core seat 1; the clamping seat 13 is provided with a valve core propping end face 14; a water inlet water hole 15 and a water outlet water hole 153 are formed on the valve core propping end surface 14; the inlet water passing hole 15 and the outlet water passing hole 153 are respectively communicated with the water inlet 11 and the water outlet 12.

Thus, the faucet inner core and the kitchen faucet related to the utility model are installed in the faucet shell 4, water flows in through the water flow inlet 11 at the lower end of the valve core seat 1, the water inlet water outlet 15 and the water outlet 153 are used for being connected with the valve core main body 5, and the water flow controlled by the valve core main body 5 flows in the inner cavity of the hard connecting pipe 2 through the water outlet 12 at the top of the valve core seat 1 and flows out upwards through the water outlet pipe; for convenient installation of the hard connecting pipe 2 and the valve core seat 1, the hard connecting pipe 2 and the valve core seat 1 are manufactured separately and then locked together in the faucet shell 4. The valve core seat 1 is provided with a clamping seat 13, so that the valve core seat 1 can be clamped in the faucet shell 4 of the existing pull faucet to realize installation. The length of the hard connecting pipe 2 can be adjusted according to the height parameter of the faucet housing 4 during manufacturing. Such as producing a rigid connection pipe 2 prepared in various length specifications.

When the single-cooled faucet is produced, only one water flow inlet 11 is arranged at the lower part of the valve core seat 1, and the valve core main body 5 connected to the valve core propping end surface 14 is a single-cooled valve core.

Preferably, when the present utility model is used for producing a cold and hot mix faucet, the water inlet 11 includes a cold water inlet 111 and a hot water inlet 112; the water inlet water passing holes 15 comprise a cold water passing hole 151 and a hot water passing hole 152; the cold water passing hole 151 and the hot water passing hole 152 are respectively communicated with the cold water inlet 111 and the hot water inlet 112. The valve core propping end surface 14 is also provided with two positioning holes 154, and the valve core main body 5 is installed and positioned through the two positioning holes 154. Further, threads for connecting a water supply pipe (not shown) are provided in each of the cold water inlet 111 and the hot water inlet 112.

Preferably, an annular groove 16 is provided on the spool seat 1 on the side of the clamping seat 13 facing away from the spool abutment end face 14. The annular groove 16 has the function of processing a red punched copper part blank into a flat clamping seat 13, cutting off redundant materials and avoiding interference with a mounting seat 421 on the faucet shell 4.

The normal line of the valve core propping end surface 14 can be perpendicular to the axis of the hard connecting pipe 2 or form an obtuse angle or an acute angle so as to adapt to different faucet shell 4 styles; such as the faucet housing 4 used in the cartridge mounting cartridge 42 shown in fig. 3 of chinese patent CN216009630U, which is tilted slightly upward. Preferably, as shown in fig. 3 of the present utility model, the hard connecting pipe 2 is a straight pipe, and the axis of the hard connecting pipe 2 is perpendicular to the normal line of the valve element abutting end surface 14.

Preferably, the lower end of the hard connecting pipe 2 is provided with a first external thread 21, the water outlet 12 is provided with a first internal thread 121, and the hard connecting pipe 2 and the water outlet 12 are in locking connection through threads; an inner hexagonal countersink 22 is arranged at the upper part of the inner cavity of the hard connecting pipe 2. The hard connecting pipe 2 is connected with the valve core seat 1 in a threaded mode, the installation mode is simple and firm, and the inner hexagonal countersink 22 is arranged for connecting a wrench in order to conveniently drive the hard connecting pipe 2 to rotate.

Preferably, the hard connecting pipe 2 and the valve core seat 1 are made of copper materials.

Preferably, a sealing groove is arranged at the upper part of the outer side wall of the hard connecting pipe 2, and a sealing ring 23 is arranged in the sealing groove; also comprises a rotary joint 3; the rotary joint 3 comprises an inner joint 31 and a rotary sleeve 32, and the rotary sleeve 32 is rotatably connected to the outer side of the inner joint 31; a water passing cavity which penetrates up and down is formed in the inner joint 31; the water passing cavity is provided with a sliding cavity 311 which is in sliding connection with the sealing ring 23, and the sliding cavity 311 is communicated with the lower end surface of the inner joint 31. The upper end of the hard connecting pipe 2 is connected with a rotary joint 3, and the rotary joint 3 is arranged on the tap shell 4 to be connected with a water outlet pipe, so that the water outlet pipe can smoothly rotate relative to the tap shell 4.

The sliding cavity 311 is provided in the inner joint 31 of the swivel joint 3, so that the upper portion of the hard connecting pipe 2 can slide in the sliding cavity 311, and even if a certain error exists in the height of the faucet housing 4, the sliding of the hard connecting pipe 2 and the sliding cavity 311 can be corrected, so that the connection between the hard connecting pipe 2 and the swivel joint 3 is ensured. And the sliding cavity 311 is arranged, when the second external thread 312 of the inner joint 31 is in threaded connection with the faucet shell 4, the inner joint 31 moves downwards relative to the faucet shell 4 along with the rotation of the inner joint 31, and at the moment, the sealing ring 23 at the upper part of the hard connecting pipe 2 slides in the sliding cavity 311, so that the normal rotation during the threaded rotation connection is ensured.

Preferably, a plurality of sealing grooves are arranged at intervals along the axial direction, and each sealing groove is internally provided with a sealing ring 23; the lower part of the nipple 31 is provided with a second external thread 312. The plurality of sealing rings 23 are arranged, so that the sliding of the sliding cavity 311 and the upper end of the hard connecting pipe 2 is more stable; the multi-way sealing ring 23 also ensures the sealing effect.

The present utility model also provides a kitchen faucet, as shown in fig. 3 to 6, comprising a faucet housing 4 and a cartridge body 5; the side of the tap shell 4 is provided with a valve core mounting cylinder 42; a mounting seat 421 is arranged in the valve core mounting cylinder 42; preferably, the mounting seat 421 comprises two parts on left and right opposite sides;

the faucet inner core is also included; the clamping seat 13 is clamped on the mounting seat 421; the valve core main body 5 is arranged in the valve core mounting cylinder 42 and is in propping contact with the valve core propping end face 14; the lower end of the hard connecting pipe 2 is fixedly connected with the water outlet 12; the upper end of the hard connecting pipe 2 is communicated with a water outlet pipe of the faucet.

Specifically: a kitchen faucet comprises a faucet shell 4, a valve core main body 5, a valve core seat 1, a hard connecting pipe 2 and a rotary joint 3; a valve core mounting cylinder 42 is formed on the side part of the faucet shell 4, and a mounting seat 421 is arranged in the valve core mounting cylinder 42; a second internal thread 41 is arranged in the upper end opening of the tap shell 4;

the lower end of the valve core seat 1 is provided with a cold water inlet 111 and a hot water inlet 112 which are arranged downwards; the upper end of the valve core seat 1 is provided with an upward mixed water outlet; a clamping seat 13 is formed on the side part of the valve core seat 1; the clamping seat 13 is provided with a valve core propping end face 14; a cold water passing hole 151, a hot water passing hole 152 and a mixed water passing hole are formed on the valve core propping end surface 14; the cold water passing hole 151, the hot water passing hole 152 and the mixed water passing hole are respectively communicated with the cold water inlet 111, the hot water inlet 112 and the mixed water outlet;

the clamping seat 13 is clamped on the mounting seat 421; the lower end of the hard connecting pipe 2 is in threaded connection with the mixed water outlet; the valve core main body 5 is arranged in the valve core mounting cylinder 42 and is in propping contact with the valve core propping end face 14; a plurality of sealing grooves are formed in the upper portion of the outer side wall of the hard connecting pipe 2 at intervals, and a sealing ring 23 is arranged in each sealing groove;

the rotary joint 3 comprises an inner joint 31 and a rotary sleeve 32, and the rotary sleeve 32 is rotatably connected to the outer side of the inner joint 31; a water passing cavity which penetrates up and down is formed in the inner joint 31; the water passing cavity is provided with a sliding cavity 311 which is in sliding connection with the sealing ring 23, and the sliding cavity 311 is communicated with the lower end surface of the inner joint 31; the lower part of the nipple 31 is provided with a second external thread 312; the second external thread 312 is in locking connection with the second internal thread 41.

The valve core main body 5 is installed in the valve core installation cylinder 42 and abuts against the valve core abutting end face 14, so that the clamping seat 13 of the valve core seat 1 can abut against the installation seat 421 in the faucet shell 4, and the fixation of the valve core seat 1 is realized. As shown in fig. 3, a jack ring 51 is provided on the outside of the spool body 5, and the jack ring 51 is screwed with the spool mounting cylinder 42.

Compared with the prior art, the utility model has the advantages that the hard connecting pipe 2 is connected with the water outflow port 12 on the valve core seat 1, and the upper end of the hard connecting pipe 2 is connected with the water outflow pipe to outflow water. The clamping seat 13 on the valve core seat 1 is used for being connected with the faucet shell 4, so that the valve core seat 1 is installed in the faucet shell 4 of the existing drawing faucet and hard connection is realized, the production of the kitchen faucet is realized, and the production cost of products is reduced.

The above examples and drawings are not intended to limit the form or form of the present utility model, and any suitable variations or modifications thereof by those skilled in the art should be construed as not departing from the scope of the present utility model.

Claims (10)

1. The tap inner core is characterized by comprising a valve core seat and a hard connecting pipe; the lower end of the valve core seat is provided with a water flow inlet which is arranged downwards; the upper end of the valve core seat is provided with an upward water outlet; the lower end of the hard connecting pipe is fixedly connected with the water outlet, and the upper end of the hard connecting pipe is communicated with a water outlet pipe of the faucet; a clamping seat is formed on the side part of the valve core seat; the clamping seat is provided with a valve core propping end face; a water inlet water hole and a water outlet water hole are formed on the propping end surface of the valve core; the water inlet water passing hole and the water outlet water passing hole are respectively communicated with the water inlet and the water outlet.

2. A tap core as claimed in claim 1, wherein said water inlet comprises a cold water inlet and a hot water inlet; the water inlet water passing holes comprise cold water passing holes and hot water passing holes; the cold water passing hole and the hot water passing hole are respectively communicated with the cold water inlet and the hot water inlet.

3. A tap core as claimed in claim 1, wherein an annular groove is provided in the cartridge seat on a side of the cartridge seat facing away from the top end surface of the cartridge.

4. A tap core as claimed in claim 1, wherein said hard connection tube is a straight tube, and an axis of said hard connection tube is perpendicular to a normal line of a tip end surface of said valve element.

5. The faucet core of claim 1, wherein the lower end of the rigid connection tube is provided with a first external thread, the water outlet is provided with a first internal thread, and the rigid connection tube is in threaded locking connection with the water outlet; an inner hexagonal countersink is arranged at the upper part of the inner cavity of the hard connecting pipe.

6. A tap core as claimed in claim 1, wherein said rigid connection tube and said cartridge holder are each formed of copper.

7. The faucet core of claim 1, wherein a sealing groove is provided in an upper portion of an outer sidewall of the hard connection tube, and a sealing ring is provided in the sealing groove; the rotary joint is also included; the rotary joint comprises an inner joint and a rotary sleeve, and the rotary sleeve is rotationally connected to the outer side of the inner joint; a water passing cavity which penetrates up and down is formed in the inner joint; the water passing cavity is provided with a sliding cavity which is in sliding connection with the sealing ring, and the sliding cavity is communicated with the lower end face of the inner joint.

8. The faucet core of claim 7, wherein a plurality of seal grooves are arranged at intervals along the axial direction, and each seal groove is internally provided with a seal ring; the lower part of the inner joint is provided with a second external thread.

9. A kitchen faucet is characterized by comprising a faucet shell and a valve core main body; a valve core mounting cylinder is formed on the side part of the faucet shell; a mounting seat is arranged in the valve element mounting cylinder; further comprising a tap core according to any of claims 1-8; the clamping seat is clamped on the mounting seat; the valve core main body is arranged in the valve core mounting cylinder and is in propping contact with the valve core propping end surface; the lower end of the hard connecting pipe is fixedly connected with the water outlet; the upper end of the hard connecting pipe is communicated with a water outlet pipe of the faucet.

10. The kitchen faucet is characterized by comprising a faucet shell, a valve core main body, a valve core seat, a hard connecting pipe and a rotary joint; a valve core mounting cylinder is formed on the side part of the faucet shell, and a mounting seat is arranged in the valve core mounting cylinder; a second internal thread is arranged in the upper end opening of the faucet shell;

the lower end of the valve core seat is provided with a cold water inlet and a hot water inlet which are arranged downwards; the upper end of the valve core seat is provided with an upward mixed water outlet; a clamping seat is formed on the side part of the valve core seat; the clamping seat is provided with a valve core propping end face; a cold water passing hole, a hot water passing hole and a mixed water passing hole are formed on the propping end surface of the valve core; the cold water passing hole, the hot water passing hole and the mixed water passing hole are respectively communicated with the cold water inlet, the hot water inlet and the mixed water outlet;

the clamping seat is clamped on the mounting seat; the lower end of the hard connecting pipe is in threaded connection with the mixed water outlet; the valve core main body is arranged in the valve core mounting cylinder and is in propping contact with the valve core propping end surface; a plurality of sealing grooves are formed in the upper part of the outer side wall of the hard connecting pipe at intervals, and a sealing ring is arranged in each sealing groove;

the rotary joint comprises an inner joint and a rotary sleeve, and the rotary sleeve is rotationally connected to the outer side of the inner joint; a water passing cavity which penetrates up and down is formed in the inner joint; the water passing cavity is provided with a sliding cavity which is in sliding connection with the sealing ring, and the sliding cavity is communicated with the lower end face of the inner joint; the lower part of the inner joint is provided with a second external thread; the second external thread is in locking connection with the second internal thread.