CN212537080U

CN212537080U - Water inlet connector and water heater

Info

Publication number: CN212537080U
Application number: CN202020884445.1U
Authority: CN
Inventors: 艾穗江; 杨启欣; 刘兵
Original assignee: Guangdong Macro Gas Appliance Co Ltd
Current assignee: Guangdong Macro Gas Appliance Co Ltd
Priority date: 2020-05-22
Filing date: 2020-05-22
Publication date: 2021-02-12
Anticipated expiration: 2030-05-22

Abstract

The utility model discloses a water supply connector to a water heater with water supply connector is disclosed, wherein water supply connector includes the casing, and the inboard of casing is equipped with: the water inlet channel is arranged along the vertical direction, a main water inlet is arranged at the lower side of the water inlet channel, and a main water outlet is arranged at the upper side of the water inlet channel; the water return channel is arranged along the transverse direction, the head end of the water return channel is communicated with the water inlet channel, and the tail end of the water return channel is provided with a water return port; the backwater check valve is detachably connected in the backwater channel. The backwater one-way valve can be directly inserted from the backwater port and installed in the backwater channel, so that the installation is convenient; in addition, the water return port transversely faces to the water inlet, the total water inlet is vertically arranged, so that a large installation space is reserved for installing the external water inlet pipe and the external water return pipe, interference between the external water inlet pipe and the external water return pipe is reduced, and the installation is more convenient.

Description

Water inlet connector and water heater

Technical Field

The utility model relates to a water heater technical field, in particular to water supply connector and water heater.

Background

In order to realize the function of instant heating and opening, the zero-cold water heater needs to form a closed circulation loop between the water heater and a water using end, so that hot water can be heated in the circulation loop within a certain range before the hot water is used, and the hot water can be discharged by opening the water using end. The current circulation loop has two structures, one is that three interfaces are arranged on the water heater: the household water heater comprises a water inlet, a hot water outlet and a water return port, wherein three pipes, namely a water inlet pipe, a hot water outlet pipe and a water return pipe, are correspondingly arranged in a user's home, and the water heater, the hot water outlet pipe and the water return pipe form a circulation loop; the other is that two interfaces are arranged on the water heater: the water heater, the hot water outlet pipe and the water inlet pipe form a circulation loop, and no return pipe is arranged.

The existing joint can enable a water heater provided with two interfaces to be suitable for pipelines with and without a water return pipe, the joint is provided with a water return port and a water inlet, and a one-way valve is arranged between the water return port and the water inlet; however, the mounting structure of the one-way valve of the joint is complex, and the water inlet connected with the external water inlet pipe and the water return port connected with the external water return pipe are adjacent and close, so that the water inlet pipe and the water return pipe are inconvenient to mount.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a water inlet joint.

The utility model discloses still provide a water heater that has above-mentioned water supply connector.

According to the utility model discloses a water supply connector of first aspect embodiment, which comprises a housin, the inboard of casing is equipped with:

the water inlet channel is arranged along the vertical direction, a main water inlet is formed in the lower side of the water inlet channel, and a main water outlet is formed in the upper side of the water inlet channel;

the water return channel is arranged along the transverse direction, the head end of the water return channel is communicated with the water inlet channel, the tail end of the water return channel is provided with a water return port, and the water return port and the water return channel are coaxially arranged;

the water return one-way valve is detachably connected in the water return channel, the water flowing direction of the water return one-way valve is the direction from the water return port to the water inlet channel, and the water return one-way valve is inserted into the water return channel through the water return port.

According to the utility model discloses water supply connector has following beneficial effect at least: the main water outlet is connected with a water inlet of an external water heater, an external water inlet pipe is connected with the main water inlet, a water return port can be connected with an external water return pipe, and external cold water and return water enter the water heater through the main water outlet; the backwater one-way valve can be directly inserted from the backwater port and installed in the backwater channel, so that the installation is convenient; in addition, the water return port transversely faces to the water inlet, the total water inlet is vertically arranged, so that a large installation space is reserved for installing the external water inlet pipe and the external water return pipe, interference between the external water inlet pipe and the external water return pipe is reduced, and the installation is more convenient.

According to the utility model discloses a some embodiments, be equipped with the location shoulder in the return water passageway, be close to on the return water check valve inlet channel's one end butt in the location is epaxial, be equipped with first draw-in groove in the return water passageway, the joint has first jump ring in the first draw-in groove, first jump ring butt in be close to on the return water check valve return water mouth's one end. After the return water check valve is inserted into the return water channel from the return water port, the return water check valve is abutted against the positioning shoulder and then clamped in the first clamping groove by the first clamping spring, so that the return water check valve can be installed in the return water channel.

According to some embodiments of the present invention, the water return channel is disposed along the left-right direction, the water return channel is disposed on the left side of the water inlet channel, the backwater one-way valve comprises a left shell and a right shell which are connected with each other, the right side of the left shell is sleeved on the left side of the right shell, the left side of the left shell is abutted against the first clamp spring, the right side of the right shell is abutted against the left end of the positioning shoulder, a first sealing ring is arranged between the periphery of the left shell and the water return channel, a water inlet hole is arranged at the left side of the left shell, the right side of the right shell is provided with a water outlet hole, the water inlet hole, the water outlet hole and the water inlet channel are communicated, a water return valve core is arranged in the left shell, a water return spring is connected to the right side of the water return valve core, the right side of the water return spring is abutted against the right shell, and a second sealing ring is arranged on the left side of the return water valve core and is abutted to the water inlet hole.

The left end of the positioning shoulder is abutted to the right shell, and the left end of the left shell is abutted to the first clamp spring, so that the return water check valve is fixed in the return water channel. The water return spring presses the water return valve core on the water inlet hole leftwards, and a second sealing ring is arranged on the water return valve core and pressed on the water inlet hole for sealing; when the water return port is connected with a water return pipe, the return water pushes the return water valve core to the right and then enters the water inlet channel; when the water return port is not connected with the water return pipe, water in the water inlet channel presses the water return valve core rightwards to prop against the water inlet hole, and the water cannot flow out of the water inlet hole.

According to some embodiments of the utility model, the inboard of casing still is equipped with drainage channel, drainage channel sets up along horizontal direction, drainage channel's head end with water inlet channel intercommunication, drainage channel's end is equipped with the outlet, be equipped with the drain valve in the drainage channel. The drainage channel can be used for draining water in the water heater and the pipeline, the water heater is normally used when the drainage valve is closed, and the water can be drained when the drainage valve is opened.

According to some embodiments of the utility model, drainage channel sets up along controlling the direction, drainage channel locates intake channel's right side, drainage channel with return water channel is coaxial to be set up, the drain valve includes the drainage valve body, the drainage valve body with drainage channel releasable connection, the drainage valve body with drainage channel rotates to be connected, the drainage valve body with drainage channel axial fixity, drainage valve body's left side is located intake channel's right side, be equipped with the perpendicular to on the drainage valve body return water channel's accent water passageway, accent water passageway with intake channel is just to setting up, drainage valve body's periphery with be equipped with the third sealing washer between the drainage channel, drainage valve body's right-hand member is equipped with rotation regulating part.

The drain valve body is inserted into the drain passage from the drain opening and detachably connected in the drain valve body. The relative angle between the water adjusting channel and the water inlet channel can be adjusted by rotating the rotating adjusting part, and the size of a water passing opening formed between the water adjusting channel and the water inlet channel is adjusted, so that the size of water entering the water heater from the main water inlet is adjusted. The third sealing ring is used for keeping the sealing between the drainage valve body and the drainage channel and preventing water from flowing out.

According to the utility model discloses a few embodiments, the inboard of drainage valve body is equipped with the pressure release passageway, pressure release entry and pressure release export are regarded as respectively to the both ends of pressure release passageway, the pressure release entry with the passageway intercommunication of intaking, be equipped with the relief valve in the pressure release passageway. When the water pressure in the pipeline is too high, the water pressure enables the pressure release valve to open and discharge part of water, and the water pressure of the pipeline can be reduced.

According to the utility model discloses a some embodiments, still be equipped with the water filtering piece in the casing, the water filtering piece passes intake channel, drainage channel with return water channel coaxial setting, the both ends of water filtering piece respectively with return water channel with drainage channel connects, be equipped with on the water filtering piece just right intake channel's drainage hole. The rivers that get into from total water inlet wear to filter water spare, can filter the granule impurity of aquatic, reduce inside granule impurity enters into the water heater, improve the life of the inside components and parts of water heater.

According to some embodiments of the utility model, the water filtering piece with the return water check valve integrated into one piece. The water filtering piece can be installed in the shell along with the backwater check valve, and the backwater check valve is fixed, so that the water filtering piece does not need to be fixed independently.

According to some embodiments of the utility model, the water filtering piece is the axis and is on a parallel with the ring post of return water passageway, be equipped with a plurality ofly on the lateral wall of water filtering piece the drainage hole. The water filtering piece is a circular column, and the axial cross-sectional area of the water filtering piece along the water inlet channel is unchanged, so that the installation angle of the water filtering piece does not need to be limited during installation, and the installation is convenient.

According to the utility model discloses a water heater of second aspect embodiment, include according to the utility model discloses the water supply connector of above-mentioned first aspect embodiment, water heater still includes the water inlet, the water inlet with total delivery port is connected.

According to the utility model discloses water heater has following beneficial effect at least: through adopting foretell water supply connector, can leave great installation space each other when making installation inlet tube and wet return, disturb each other when reducing the installation, make the installation more convenient.

The utility model is used for the water heater.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings. It is clear that the described figures represent only some embodiments of the invention, not all embodiments, and that a person skilled in the art can also derive other designs and figures from these figures without inventive effort.

Fig. 1 is a perspective view of a water inlet joint according to an embodiment of the present invention;

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

fig. 3 is a perspective view of the backwater check valve and the water filtering member according to the embodiment of the present invention.

In the drawings: 101-shell, 201-water inlet channel, 202-total water inlet, 203-total water outlet, 302-water return port, 303-positioning shoulder, 402-left shell, 403-right shell, 404-first snap spring, 405-first sealing ring, 406-water inlet hole, 407-water outlet hole, 408-water return valve core, 409-water return spring, 410-second sealing ring, 502-water outlet, 601-water discharge valve body, 602-water regulating channel, 605-positioning screw, 701-pressure relief channel, 702-pressure relief outlet, 704-pressure relief valve core, 705-pressure relief spring and 801-water filtering piece.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated with respect to the orientation description, such as up, down, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, a plurality of means are one or more, a plurality of means are two or more, and the terms greater than, less than, exceeding, etc. are understood as not including the number, and the terms greater than, less than, within, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present invention, unless otherwise explicitly defined, words such as set forth, connected, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meaning of the words in the present invention by combining the specific contents of the technical solutions.

A water inlet joint according to an embodiment of the first aspect of the present invention is described below with reference to fig. 1 to 3.

The water inlet joint comprises a shell 101, wherein the inner side of the shell 101 is provided with:

the water inlet channel 201 is arranged along the vertical direction, a main water inlet 202 is arranged at the lower side of the water inlet channel 201, and a main water outlet 203 is arranged at the upper side of the water inlet channel 201;

the water return channel is arranged along the transverse direction, the head end of the water return channel is communicated with the water inlet channel 201, the tail end of the water return channel is provided with a water return port 302, and the water return port 302 and the water return channel are coaxially arranged;

the water return check valve is detachably connected in the water return channel, the water flowing direction of the water return check valve is the direction from the water return port 302 to the water inlet channel 201, and the water return check valve is inserted into the water return channel through the water return port 302.

The main water outlet 203 is connected with a water inlet of an external water heater, an external water inlet pipe is connected with the main water inlet 202, the water return port 302 can be connected with an external water return pipe, and external cold water and return water enter the water heater through the main water outlet 203; the backwater one-way valve can be directly inserted from the backwater port 302 and installed in the backwater channel, so that the installation is convenient; in addition, the water return port 302 transversely faces to the water inlet 202 and is vertically arranged, so that a large installation space is reserved for installing an external water inlet pipe and an external water return pipe, mutual interference during installation is reduced, and the installation is more convenient.

The utility model discloses a in some embodiments, be equipped with location shoulder 303 in the return water passageway, the one end butt that is close to inhalant canal 201 on the return water check valve is equipped with first draw-in groove on location shoulder 303 in the return water passageway, and the joint has first jump ring 404 in the first draw-in groove, and first jump ring 404 butt is close to the one end of return water mouth 302 on the return water check valve. After the return water check valve is inserted into the return water channel from the return water port 302, the return water check valve is abutted against the positioning shoulder 303 and then clamped in the first clamping groove by the first clamping spring 404, so that the return water check valve can be installed in the return water channel.

Further, the backwater channel is arranged along the left-right direction, the backwater channel is arranged on the left side of the water inlet channel 201, the backwater check valve comprises a left shell 402 and a right shell 403 which are connected with each other, the right side of the left shell 402 is sleeved on the left side of the right shell 403, the left side of the left shell 402 is abutted to a first snap spring 404, the right side of the right shell 403 is abutted to the left end of the positioning shoulder 303, a first sealing ring 405 is arranged between the periphery of the left shell 402 and the backwater channel, a water inlet hole 406 is arranged on the left side of the left shell 402, a water outlet hole 407 is arranged on the right side of the right shell 403, the water inlet hole 406, the water outlet hole 407 and the water inlet channel 201 are communicated, a backwater valve core 408 is arranged in the left shell 402, a backwater spring 409 is connected to the right side of the backwater valve core 408, the right side of the.

The left end of the positioning shoulder 303 abuts against the right shell 403, and the left end of the left shell 402 abuts against the first snap spring 404, so that the return water check valve is fixed in the return water channel. A return water spring 409 presses a return water valve core 408 to the left on the water inlet hole 406, and a second sealing ring 410 is arranged on the return water valve core 408 and pressed on the water inlet hole 406 for sealing; when the water return port 302 is connected with a water return pipe, the return water pushes the return water valve core 408 to the right and then enters the water inlet channel 201; when the water return port 302 is not connected with a water return pipe, water in the water inlet channel 201 presses the water return valve core 408 to the right to press against the water inlet hole 406, and water cannot flow out of the water inlet hole 406.

In some embodiments of the present invention, the inner side of the casing 101 is further provided with a drainage channel, the drainage channel is arranged along the transverse direction, the head end of the drainage channel is communicated with the water inlet channel 201, the end of the drainage channel is provided with a water outlet 502, and a drainage valve is arranged in the drainage channel. The drainage channel can be used for draining water in the water heater and the pipeline, the water heater is normally used when the drainage valve is closed, and the water can be drained when the drainage valve is opened. The drain valve may be provided with screws, internal threads may be provided inside the drain port 502, and the screws may be screwed into the drain port 502, and the water may be drained by loosening the screws.

Further, the drainage channel sets up along left and right sides direction, the right side of inhalant canal 201 is located to the drainage channel, drainage channel and return water passageway coaxial setting, the drain valve includes drainage valve body 601, drainage valve body 601 and drainage channel releasable connection, drainage valve body 601 rotates with the drainage channel to be connected, drainage valve body 601 and drainage channel axial fixity, the right side of inhalant canal 201 is located in the left side of drainage valve body 601, be equipped with the water transfer passageway 602 of perpendicular to return water passageway on the drainage valve body 601, water transfer passageway 602 is just to setting up with inhalant canal 201, be equipped with the third sealing washer between the periphery of drainage valve body 601 and the drainage channel, the right-hand member of drainage valve body 601 is equipped with the rotation regulating part.

The drain valve body 601 is inserted into the drain passage from the drain port 502 and detachably attached to the drain valve body 601. By rotating the rotating adjusting part, the relative angle between the water adjusting channel 602 and the water inlet channel 201 can be adjusted, and the size of the water passing opening formed between the water adjusting channel 602 and the water inlet channel 201 is adjusted, so that the water quantity entering the water heater from the main water inlet 202 is adjusted. The third sealing ring is used to keep the sealing between the drain valve body 601 and the drain channel from water flowing out. After the water discharge valve body 601 is rotated to adjust the water amount, due to the sealing effect of the third sealing ring, the third sealing ring is tightly pressed on the installation channel and the water discharge valve body 601 and has locking force, so that the water discharge valve body 601 can keep a rotating angle, and the water flow cannot rotate the water discharge valve body 601.

Furthermore, a positioning screw hole perpendicular to the drainage channel is formed in the casing 101, a sliding groove extending in the circumferential direction is formed in the periphery of the drainage valve body 601, the positioning screw hole is aligned with the sliding groove, a positioning screw 605 is connected in the positioning screw hole, and the tail end of the positioning screw 605 is arranged in the sliding groove. The set screw 605 is connected in the set screw hole, and the end of the set screw 605 extends into the sliding groove to axially position the drain valve body 601. The spout extends along circumference, and the rotation of drainage valve body 601 is not influenced in the spout to the end of set screw 605, and two tip of spout can also be spacing to turned angle.

The utility model discloses a in some embodiments, the inboard of drain valve body 601 is equipped with the pressure release passageway 701 that sets up along left right direction, and the left side and the inhalant canal 201 intercommunication of pressure release passageway 701, the right-hand member of pressure release passageway 701 are equipped with pressure release outlet 702, are equipped with the relief valve in the pressure release passageway 701. When the water pressure in the pipeline is too high, the water pressure enables the pressure release valve to open and discharge part of water, and the water pressure of the pipeline can be reduced.

The utility model discloses a in some embodiments, pressure release channel 701 includes left pressure release channel and right pressure release channel that communicate each other, right side pressure release channel's pipe diameter is greater than left pressure release channel's pipe diameter, the relief valve is including locating the pressure release case 704 in the right pressure release channel, the right side of pressure release case 704 is equipped with the spring mounting groove, be equipped with pressure release spring 705 in the spring mounting groove, be equipped with the second draw-in groove that circumference set up on the inner wall of right side pressure release channel, the joint has the second jump ring in the second draw-in groove, the right side of pressure release case 704 is located to the second jump ring, be equipped with the pressure release apical ring between second jump ring and the pressure release case 704, the right side butt of pressure release apical ring in the left side of second jump ring, the right side butt of pressure release spring 705 is in the left side of pressure release apical ring. The second clamp spring is used for providing supporting force for axial fixation; the pressure relief top ring is used for abutting against the second clamp spring and providing a contact action point for the pressure relief spring 705; the relief spring 705 presses the relief valve spool 704 leftward against the right end of the left relief passage to provide a seal, which improves the sealing performance. When the water pressure is higher than the pressure of the relief spring 705, the water pushes the relief valve core 704 rightward to compress the relief spring 705 rightward for relief drainage.

In some embodiments of the present invention, a water filtering element 801 is further disposed in the casing 101, the water filtering element 801 passes through the water inlet 201, the water outlet and the water return channel are coaxially disposed, two ends of the water filtering element 801 are respectively connected to the water return channel and the water outlet, and a water filtering hole is disposed on the water filtering element 801 and is directly opposite to the water inlet 201. The water entering from the main water inlet 202 flows through the water filtering piece 801, so that particle impurities in the water can be filtered, the particle impurities are reduced from entering the water heater, and the service life of components inside the water heater is prolonged.

The filter element 801 may be installed on the inlet channel 201 before the return check valve is installed, and the filter element 801 may be removed for cleaning after the return check valve is removed. Further, the water filtering member 801 is integrally formed with the return water check valve. The water filtering element 801 can be installed in the casing 101 together with the return check valve, and the return check valve is fixed, so that the water filtering element 801 does not need to be fixed separately. In some embodiments, the drainage member 801 may also be integrally formed with the drain valve. Specifically, the water filtering member 801 is integrally formed with the right case 403.

The water filtering member 801 may be a water filtering net. Furthermore, the water filtering element 801 is a circular column with an axis parallel to the water return channel, and a plurality of water filtering holes are formed in the side wall of the water filtering element 801. The water filtering piece 801 is a circular column, and the cross-sectional area of the water filtering piece 801 along the axial direction of the water inlet channel 201 is not changed, so that the installation angle of the water filtering piece 801 is not required to be limited during installation, and the installation is convenient. The right side of the water filtering element 801 is provided with a water passing opening opposite to the pressure relief channel 701, so that the water filtering element 801 blocks the pressure relief channel 701. The left side of the drainage valve body 601 is provided with a through hole, the water filtering piece 801 penetrates through the through hole to reach the water adjusting channel 602, the water inlet channel 201, the water adjusting channel 602 and the water filtering piece 801 do not interfere with each other, and respective functions can be kept.

According to the utility model discloses the water heater of second aspect embodiment, include according to the utility model discloses the water supply connector of above-mentioned first aspect embodiment, the water heater still includes the water inlet, and the water inlet is connected with total delivery port 203.

According to the utility model discloses water heater through adopting foretell water supply connector, leaves great installation space each other when can making the outside inlet tube of installation and outside wet return, disturbs each other when reducing the installation, makes the installation more convenient.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various equivalent modifications or substitutions can be made within the knowledge of those skilled in the art without departing from the spirit of the present invention, and these equivalent modifications or substitutions are included in the scope defined by the claims of the present application.

Claims

1. A water inlet joint, characterized by, includes the casing, the inboard of casing is equipped with:

2. The water inlet joint as claimed in claim 1, wherein a positioning shoulder is provided in the water return channel, one end of the water return check valve close to the water inlet channel abuts against the positioning shoulder, a first clamping groove is provided in the water return channel, a first clamping spring is clamped in the first clamping groove, and the first clamping spring abuts against one end of the water return check valve close to the water return port.

3. The water inlet joint as claimed in claim 2, wherein the water return channel is arranged along the left-right direction, the water return channel is arranged on the left side of the water inlet channel, the water return check valve comprises a left shell and a right shell which are connected with each other, the right side of the left shell is sleeved on the left side of the right shell, the left side of the left shell is abutted against the first snap spring, the right side of the right shell is abutted against the left end of the positioning shoulder, a first sealing ring is arranged between the periphery of the left shell and the water return channel, the left side of the left shell is provided with a water inlet hole, the right side of the right shell is provided with a water outlet hole, the water inlet hole, the water outlet hole and the water inlet channel are communicated, a water return valve core is arranged in the left shell, the right side of the water return valve core is connected with a water return spring, the right side of the water return spring is abutted against the right shell, and the, the second sealing ring is abutted to the water inlet hole.

4. The water inlet joint as claimed in claim 1, wherein the inside of the housing is further provided with a drainage channel, the drainage channel is arranged along the transverse direction, the head end of the drainage channel is communicated with the water inlet channel, the tail end of the drainage channel is provided with a drainage port, and a drainage valve is arranged in the drainage channel.

5. The water inlet joint of claim 4, wherein the drainage channel is arranged along the left-right direction, the drainage channel is arranged on the right side of the water inlet channel, the drainage channel and the water return channel are coaxially arranged, the drain valve comprises a drainage valve body, the drainage valve body is detachably connected with the drainage channel, the drainage valve body is rotatably connected with the drainage channel, the drainage valve body is axially fixed with the drainage channel, the left side of the drainage valve body is arranged on the right side of the water inlet channel, a water transfer channel perpendicular to the water return channel is arranged on the drainage valve body, the water transfer channel is arranged opposite to the water inlet channel, a third sealing ring is arranged between the periphery of the drainage valve body and the drainage channel, and a rotation adjusting part is arranged at the right end of the drainage valve body.

6. The water inlet joint as claimed in claim 5, wherein a pressure relief channel is provided at the inner side of the water discharge valve body, two ends of the pressure relief channel are respectively used as a pressure relief inlet and a pressure relief outlet, the pressure relief inlet is communicated with the water inlet channel, and a pressure relief valve is provided in the pressure relief channel.

7. The water inlet joint as claimed in claim 4, wherein a water filtering element is further disposed in the housing, the water filtering element passes through the water inlet channel, the water outlet channel and the water return channel are coaxially disposed, two ends of the water filtering element are respectively connected to the water return channel and the water outlet channel, and a water filtering hole facing the water inlet channel is disposed on the water filtering element.

8. The water inlet joint of claim 7, wherein the water filtering member is integrally formed with the return check valve.

9. The water inlet joint as claimed in claim 7, wherein the water filtering member is a circular cylinder with an axis parallel to the water return channel, and a plurality of water filtering holes are formed in a side wall of the water filtering member.

10. A water heater comprising the water inlet joint according to any one of claims 1 to 9, further comprising a water inlet connected to the mains water outlet.