CN206845942U - Water intaking valve and water heater - Google Patents

Abstract

The utility model discloses a water inlet valve and a water heater, wherein the water inlet valve comprises: a first valve body having an inner cavity through which both ends are connected, and an installation hole is opened on the peripheral surface of the first valve body; Inner chamber; the filter screen is installed in the inner cavity through the installation hole and is located between the filter screen and the water outlet; the second valve body is embedded in the installation hole at one end, and the second valve body is provided with a pressure relief chamber and a pressure relief channel. The junction of the pressure channel and the pressure relief chamber forms a stepped surface away from the inner cavity; and the pressure relief assembly is installed in the pressure relief chamber, the pressure relief assembly includes a plug, an elastic member and a fastener, the plug is adjacent to the stepped surface, and the plug A pressure relief gap is formed on the head; the fastener is fixed at the end of the pressure relief cavity away from the step surface, and the fastener is provided with a pressure relief hole; the elastic piece is sandwiched between the plug and the fastener to Make the plug elastically abut against the step surface and seal the pressure relief hole. The water inlet valve of the utility model requires few assembly and installation steps and is easy to use.

Description

Water inlet valve and water heater

technical field

The utility model relates to the technical field of water heaters, in particular to a water inlet valve and a water heater.

Background technique

In order to ensure the stability of water temperature after water mixing in the case of large water outlet pressure changes in existing water heaters, it is generally necessary to connect a water inlet valve in series on the water outlet pipeline. The water inlet valve has the functions of pressure stabilization and pressure relief. Specifically, the water inlet The valve includes a pressure stabilizing valve body, a stabilizing flow assembly installed in the pressure stabilizing valve body, a pressure relief valve body plugged into a mounting hole on the peripheral surface of the pressure stabilizing valve body, a pressure relief assembly located in the pressure relief valve body, and a The strainer at the water inlet of the pressure stabilizing valve body. However, the pressure relief valve body and filter screen of the existing water inlet valve need to be installed on the pressure stabilizing valve body in different directions, and a pressure relief joint is formed on the peripheral surface of the pressure relief valve body, resulting in a relatively complicated installation structure.

Utility model content

The main purpose of the utility model is to propose a water inlet valve, aiming at solving the technical problem of the complicated installation structure of the existing water inlet valve.

In order to achieve the above purpose, the water inlet valve proposed by the utility model, the water inlet valve includes:

The first valve body has an inner cavity through which both ends are connected, and the two ends of the inner cavity are respectively a water inlet and a water outlet, and the peripheral surface of the first valve body is provided with an installation hole communicating with the inner cavity;

A stabilizing component installed in the inner cavity, and the stabilizing component is used to stabilize the pressure of the fluid in the first valve body;

A filter screen is installed in the inner cavity through the installation hole and traverses the flow surface of the inner cavity, and the flow stabilization component is located between the filter screen and the water outlet;

The second valve body is embedded in the installation hole at one end, a pressure relief chamber is provided on the end surface of the second valve body away from the inner cavity, and a pressure relief chamber is provided on the other end surface to communicate with the pressure relief chamber and the inner cavity. a channel, the junction of the pressure relief channel and the pressure relief chamber forms a stepped surface facing away from the inner cavity; and,

The pressure relief assembly is installed in the pressure relief chamber, the pressure relief assembly includes a plug, an elastic member and a fastener, the plug is adjacent to the step surface, and a pressure relief gap is formed on the plug; The fastener is fixed at one end of the pressure relief chamber away from the step surface, and the fastener is provided with a pressure relief hole; the elastic member is sandwiched between the plug and the fastener space, so that the plug elastically abuts against the stepped surface and seals the pressure relief hole.

Preferably, a groove is provided on a side of the plug facing the stepped surface, and an annular flange abutting against the stepped surface is formed between the peripheral surface of the groove and the outer peripheral surface of the plug.

Preferably, a first counterbore is provided on the side of the plug facing away from the stepped surface, a second counterbore is provided on the side of the fastener facing the stepped surface, and one end of the elastic member is embedded in The other end of the first counterbore is embedded in the second counterbore.

Preferably, the fastener is screwed into the pressure relief cavity, and the elastic member is a compression spring.

Preferably, a joint extends along the edge of the installation hole in a direction away from the first valve body, the second valve body is embedded in the joint, and the filter screen is adjacent to one end of the second valve body located in the mounting hole.

Preferably, an annular groove is provided on the outer peripheral surface of a section of the second valve body embedded in the joint, and the water inlet valve further includes a sealing ring disposed in the annular groove, and the sealing ring is sealed with the inner wall surface of the joint. Cooperate.

Preferably, a positioning counterbore is provided on a wall surface of the inner cavity opposite to the installation hole, and an end of the filter screen away from the second valve body is located in the positioning counterbore.

Preferably, the flow stabilization component includes:

a stopper protruding from the wall surface of the inner cavity, and the stopper extends circumferentially along the valve body and is arranged in an annular shape;

The spool, the spool includes a core rod and a core ring protruding from the outer peripheral surface of one end of the core rod, the core ring is provided with a water tank hole, the valve core is fixed in the inner cavity and adjacent to the The stopper, the core ring is located at one end of the core rod away from the stopper; and

The deformation ring is arranged in the inner cavity, the deformation ring is set on the core rod and limited between the stopper and the core ring, and the deformation ring is used to reduce its inner edge when the hydraulic pressure increases area to correspondingly reduce the water gap between the deformation ring and the core rod; The water gap between the core rods.

Preferably, the filter screen includes a bracket and a mesh coated on the bracket, the bracket includes an inner ring, an outer ring opposite to the inner ring, and several wires connecting the inner ring and the outer ring A support rod, the mesh is wrapped on a side of the bracket away from the water inlet.

The utility model also proposes a water heater, including a water inlet valve, and the water inlet valve includes:

The first valve body has an inner cavity through which both ends are connected, and the two ends of the inner cavity are respectively a water inlet and a water outlet, and the peripheral surface of the first valve body is provided with an installation hole communicating with the inner cavity;

a flow stabilization component installed in the inner cavity, the flow stabilization component is used to stabilize the pressure of the fluid in the first valve body, and the flow stabilization component is located between the filter screen and the water outlet;

A filter screen is installed in the inner cavity through the installation hole and traverses the flow surface of the inner cavity;

The second valve body is embedded in the installation hole at one end, a pressure relief chamber is provided on the end surface of the second valve body away from the inner cavity, and a pressure relief chamber is provided on the other end surface to communicate with the pressure relief chamber and the inner cavity. a channel, the junction of the pressure relief channel and the pressure relief chamber forms a stepped surface facing away from the inner cavity; and,

The pressure relief assembly is installed in the pressure relief chamber, the pressure relief assembly includes a plug, an elastic member and a fastener, the plug is adjacent to the step surface, and a pressure relief gap is formed on the plug; The fastener is fixed at one end of the pressure relief chamber away from the step surface, and the fastener is provided with a pressure relief hole; the elastic member is sandwiched between the plug and the fastener space, so that the plug elastically abuts against the stepped surface and seals the pressure relief hole.

The water inlet valve of the utility model installs the filter screen in the first valve body through the installation hole, and the second valve body is embedded in the installation hole. In this way, the filter screen and the second valve body are installed in the first valve body along the same direction. body, which simplifies the assembly process; in addition, because the fastener is provided with a pressure relief hole, when the pressure is relieved, the water flows out from the inner cavity of the first valve body through the pressure relief channel, the pressure relief gap and the pressure relief hole, and the second valve body The end of the body away from the first valve body can be directly connected to the pressure relief pipeline, thereby further simplifying the corresponding installation structure.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are only some embodiments of the present utility model, and those skilled in the art can also obtain other drawings according to the structures shown in these drawings without creative work.

Fig. 1 is the structural representation of an embodiment of the water inlet valve of the present invention;

Fig. 2 is a schematic cross-sectional structure diagram of the water inlet valve in Fig. 1 after being cut along the axes of the first valve body and the second valve body;

Fig. 3 is a partial enlarged view of place A in Fig. 2;

Fig. 4 is a partial enlarged view of place B in Fig. 2;

Fig. 5 is a partial cross-sectional structural schematic diagram of the water inlet valve in Fig. 1 after removing the flow stabilization component and the pressure relief component and cutting along the axes of the first valve body and the second valve body;

Fig. 6 is the structural representation of filter screen among Fig. 5;

Fig. 7 is a schematic cross-sectional structure diagram of the filter screen in Fig. 6 .

Explanation of reference numbers:

label name label name label name 1 first valve body 222 core ring 43 step surface 11 Lumen 223 sink hole 44 Card head 12 water intake twenty three deformation circle 5 Pressure relief components 13 Outlet 3 filter 51 plug 14 Mounting holes 31 bracket 511 groove 15 connector 311 inner circle 512 flange 16 Annular groove 312 outer ring 513 first counterbore 17 Positioning counterbore 313 support rod 52 Elastic 2 Steady flow components 314 Positioning pieces 53 fastener twenty one stopper 315 card hole 531 pressure relief hole 211 stop ring 32 mesh 532 second counterbore 212 side wall 4 second body 54 Pressure relief clearance twenty two Spool 41 Pressure relief chamber 6 sealing ring 221 core rod 42 Pressure relief channel

The realization of the purpose of the utility model, functional characteristics and advantages will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

It should be noted that if there is a directional indication (such as up, down, left, right, front, back...) in the embodiment of the present utility model, the directional indication is only used to explain the position in a certain posture (as shown in the accompanying drawing). If the relative positional relationship, movement conditions, etc. between the components shown in the figure below are changed, if the specific posture changes, the directional indication will also change accordingly.

In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present utility model, the descriptions of "first", "second", etc. Implying their relative importance or implying the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In addition, the technical solutions of the various embodiments can be combined with each other, but it must be based on the realization of those skilled in the art. When the combination of technical solutions is contradictory or cannot be realized, it should be considered that the combination of technical solutions does not exist , also not within the scope of protection required by the utility model.

The utility model provides a water inlet valve.

In the embodiment of the utility model, as shown in Fig. 1, Fig. 2 and Fig. 5, the water inlet valve includes:

The first valve body 1 has an inner cavity 11 through which both ends are connected. The two ends of the inner cavity 11 are water inlet 12 and water outlet 13 respectively. The peripheral surface of the first valve body 1 is provided with a mounting hole 14 communicating with the inner cavity 11. ;

The flow stabilization component 2 is installed in the inner cavity 11, and the flow stabilization component 2 is used to stabilize the pressure of the fluid in the first valve body 1;

The filter screen 3 is installed in the inner cavity 11 through the installation hole 14 and traverses the flow surface of the inner cavity 11, and the flow stabilization component 2 is located between the filter screen 3 and the water outlet 13;

The second valve body 4 is embedded in the installation hole 14 at one end, and the end surface of the second valve body 4 facing away from the inner cavity 11 is provided with a pressure relief chamber 41 , and the other end surface is provided with a pressure relief channel connecting the pressure relief chamber 41 and the inner cavity 11 42, the junction of the pressure relief channel 42 and the pressure relief cavity 41 forms a stepped surface 43 away from the inner cavity 11; and,

The pressure relief assembly 5 is installed in the pressure relief cavity 41. The pressure relief assembly 5 includes a plug 51, an elastic member 52 and a fastener 53. The plug 51 is adjacent to the step surface 43, and a pressure relief gap 54 is formed on the plug 51; Firmware 53 is fixedly arranged on one end of pressure relief chamber 41 away from step surface 43, and fastener 53 is provided with pressure relief hole 531; Elastic member 52 is sandwiched between plug 51 and fastener 53, so that The plug 51 elastically abuts against the stepped surface 43 and seals the pressure relief hole 531 .

In this embodiment, the first valve body 1 and the second valve body 4 generally have a tubular structure, and can be made by injection molding or metal die-casting. The outer peripheral surface is provided with an annular mounting groove for embedding the sealing element, and the outer peripheral surface of the other end is provided with external threads. In addition, in order to fix the first valve body 1 conveniently, lugs can also be provided on the outer peripheral surface of the first valve body 1, and fixing holes can be set on the lugs, so that the first valve body can be fixed with appropriate fasteners 53 1.

The flow stabilization component 2 adjusts the pressure of the fluid flowing through the cavity 11 of the first valve body 1 by controlling the flow area of the cavity 11 of the first valve body 1. The flow stabilization component 2 can adopt any existing structure , for example, a partition plate that traverses the inner cavity 11 is provided, and a valve hole is opened on the partition plate; a stepped shaft-shaped valve plug is provided, and a water passage is provided on the valve plug, and a spring is provided to connect the valve plug , when water flows through the water passage of the valve plug, a force is generated to push the valve plug, and the elastic force of the spring is balanced with this thrust, and the flow area between the valve plug and the valve hole is changed by changing the position of the valve plug to balance the pressure.

The filter screen 3 is used to filter the fluid flowing through the inner chamber 11 of the first valve body 1 to prevent impurities from hindering the normal operation of the flow stabilization assembly 2 and the pressure relief assembly 5. Metal mesh with better self-supporting properties can be used, such as stainless steel mesh.

In the pressure relief assembly 5, the pressure relief gap 54 can be formed inside the plug 51, and can also be formed between the outer peripheral surface of the plug 51 and the inner wall surface of the gas relief chamber 41. In order to achieve a better plugging effect, one end of the plug 51 abutting against the step surface 43 can be made of rubber or other elastic material, and the other end can be made of ordinary plastic or metal; generally, it can be set as a split in the middle structure, the two parts are scarfed together, thus avoiding the use of glue to fix the two parts of the split. The elastic member 52 can be a spring or a simple rubber block. It can be understood that the arrangement of the elastic member 52 needs to ensure that the pressure relief chamber 41 is not blocked.

The water inlet valve of the utility model installs the filter screen 3 in the first valve body 1 through the installation hole 14, and the second valve body 4 is embedded in the installation hole 14. In this way, the filter screen 3 and the second valve body 4 are Installed on the first valve body 1 along the same direction, which simplifies the assembly process; in addition, because the fastener 53 is provided with a pressure relief hole 531, when the pressure is relieved, water flows from the inner cavity 11 of the first valve body 1 through the pressure relief channel 42. The pressure relief gap 54 and the pressure relief hole 531 flow out, and the end of the second valve body 4 away from the first valve body 1 can be directly connected with a pressure relief pipe, thereby further simplifying the corresponding installation structure.

Further, please refer to FIG. 3 together. The side of the plug 51 facing the stepped surface 43 is provided with a groove 511 , and an annular ring abutting against the stepped surface 43 is formed between the peripheral surface of the groove 511 and the outer peripheral surface of the plug 51 . flange 512 .

In this embodiment, by arranging the flange 512 to abut against the stepped surface 43, the contact area between the plug 51 and the stepped surface 43 can be correspondingly reduced, and at the same time, the imbalance of the mating surface can be compensated by utilizing the deformation of the flange 512 itself, and then Compared with using the entire end surface to cooperate with the stepped surface 43, the sealing effect is improved.

Further, the side of the plug 51 facing away from the stepped surface 43 is provided with a first counterbore 17, the side of the fastener 53 facing the stepped surface 43 is provided with a second counterbore 532, and one end of the elastic member 52 is embedded in the first counterbore. The other end of the hole 17 is embedded in the second counterbore 532 .

In this embodiment, the elastic member 52 is not easy to disengage from the plug 51 or the fastening member 53 during the process of being compressed and stretched, and at the same time, it can keep in contact with the two to ensure the preload of the plug 51 . Preferably, the fastener 53 is screwed into the pressure relief chamber 41, and the elastic member 52 is a compression spring. In this way, by adjusting the screw-in depth of the fastener 53 , the preload of the elastic member 52 acting on the plug 51 can be changed, thereby changing the pressure relief threshold.

Further, a joint 15 extends from the edge of the installation hole 14 in a direction away from the first valve body 1 , the second valve body is embedded in the joint 15 , and one end of the filter screen 3 adjacent to the second valve body is located in the installation hole 14 .

In this embodiment, the connection strength between the second valve body 4 and the first valve body 1 can be improved by setting the joint 15, and one end of the filter screen 3 is located in the installation hole 14, so that it can be supported and prevented from contact with the inner cavity. A gap is created between the walls of 11. In order to ensure sealing and fixing, the second valve body 4 is threadedly matched with the joint 15 . The outer peripheral surface of the end of the second valve body 4 exposed to the joint 15 is a plurality of ribs connected along the circumferential direction of the second valve body, so that the second valve body 4 is easy to rotate.

Further, an annular groove (not marked) is provided on the outer peripheral surface of a section of the second valve body 4 embedded in the joint 15, and the water inlet valve also includes a sealing ring 6 disposed in the annular groove, and the sealing ring 6 is in sealing fit with the inner wall surface of the joint 15 . In this way, water can be prevented from seeping out from the mating surface of the second valve body 4 and the joint 15 .

Further, please refer to FIG. 2 again, a positioning counterbore 17 is opened on the wall surface of the inner chamber 11 opposite to the installation hole 14 , and the end of the filter screen 3 away from the second valve body 4 is located in the positioning counterbore 17 . Both ends of the filter screen 3 are supported, so that the filter screen 3 is not easy to shake under the impact of water, thereby ensuring a better filtering effect.

Further, please refer to Fig. 2 and Fig. 4, the steady flow assembly 2 includes:

The stopper 21 protrudes from the wall surface of the inner cavity 11, and the stopper 21 extends along the circumference of the valve body and is arranged in a ring shape;

The spool 22, the spool 22 includes a core rod 221 and a core ring 222 protruding from the outer peripheral surface of one end of the core rod 221, the core ring 222 is provided with a sink hole 223, the spool 22 is fixed in the inner cavity 11 and adjacent to the stop Part 21, the core ring 222 is located at one end of the core rod 221 away from the stopper 21; and

The deformation ring 23 is arranged in the inner cavity 11. The deformation ring 23 is sleeved on the core rod 221 and limited between the stopper 21 and the core ring 222. The deformation ring 23 is used to reduce the area of its inner edge when the hydraulic pressure is increased. To correspondingly reduce the water gap between the deformation ring 23 and the core rod 221; water gap.

In this embodiment, the stopper 21 can be separated from the first valve body 1 and detachably installed with the first valve body 1 , or can be integrated with the first valve body 1 . The length of the core rod 221 of the valve core 22 can be adaptively adjusted according to the size of the deformation ring 23 , the shape of the core rod 221 can be set as a column, and the core ring 222 can be set as a circular ring coaxial with the core rod 221 . The deformation ring 23 can simply be made of an elastic material. For convenience, the deformation ring 23 can change the inner edge area accordingly as the hydraulic pressure changes. The hard ring sheet, and the elastic skin connected to the inner edge of the two hard ring sheets at the inner edge of the deformation ring 23, the two hard ring sheets and the elastic skin surround to form a closed cavity filled with a certain gas.

By setting the sealing ring 6 sleeved on the core rod 221 and limited between the stopper 21 and the core ring 222 in the valve inner cavity 11, the area of the inner edge of the sealing ring 6 is reduced when the hydraulic pressure increases, so as to correspond Minimize the water passing gap between the seal ring 6 and the core rod 221, thereby reducing the flow area of the water flow there, so that the water pressure of the water outlet 13 is stable; thus, the effect of the water outlet of the water heater is effectively guaranteed, and the rated requirements are met at the same time of water output. Compared with the existing water inlet valve, the steady flow assembly 2 of this embodiment does not need to install a spring in the first valve body 1, and the change of the size of the water passing gap does not need to be realized through the movement of the valve core 22, so that the valve core 22 does not need to be slidably matched with the inner wall of the valve cavity, and has lower installation requirements. Therefore, the water inlet valve in this embodiment has a simple structure, easy assembly, and lower processing costs.

Preferably, in order to further simplify the assembly, the stopper 21 includes a stopper ring 211 and a cylindrical sidewall 212 extending from the outer edge of the stopper ring 211, and the outer wall surface of the sidewall 212 is embedded with the wall surface of the inner chamber 11; The outer edge of the core ring 222 is embedded with the inner wall of the side wall 212 , and the deformation ring 23 is located in the space enclosed by the stop ring 211 and the side wall 212 . In this way, the installation on the wall surface of the inner cavity 11 of the first valve body 1 is more firm; at the same time, the stopper 21, the deformation ring 23 and the valve core 22 can be installed together and then installed into the first valve body during installation. 1. The inner chamber 11 makes loading and unloading easier.

Further, referring to Fig. 2 and Fig. 5 to Fig. 7, the filter screen 3 includes a bracket 31 and a mesh 32 coated on the bracket 31, the bracket 31 includes an inner ring 311, an outer ring 312 opposite to the inner ring 311, and A plurality of support rods 313 connecting the inner ring 311 and the outer ring 312 , the mesh 32 covers the side of the bracket 31 away from the water inlet 12 .

In this embodiment, the filter screen 3 forms an opening facing the water inlet 12, so that the incoming water flow can be better netted or caught. The structural strength of the filter screen 3 itself can be enhanced by arranging the bracket 31 , thereby facilitating the installation of the filter screen 3 . Specifically, the bracket 31 can form a support function with a possibly flexible mesh sheet 32 .

Preferably, the inner edge of the outer ring 312 is provided with a positioning piece 314 between two adjacent support rods 313, and the positioning piece 314 is formed by extending from the outer ring 312 and extending radially inward from the outer ring 312; each positioning piece The top of 314 encloses and forms a clamping hole 315, and the inner end surface of the second valve body 4 is protruded with the clamping head 44 embedded in the clamping hole 315, and the pressure relief channel 42 runs through the clamping head 44, and the inner end surface of the second valve body 4 abut against the positioning piece 314 . The setting of the positioning piece 314 can facilitate the use of the second valve body 4 to press the filter screen 3 into the appropriate position of the first valve body 1, and the setting of the clamping hole 315 facilitates the assembly of the filter screen 3 to the second valve body 4 for convenience. It is mounted to the first valve body 1 together with the second valve body 4 . Further, since a gap may be formed between two adjacent positioning pieces 314 , in order to facilitate rotating the filter screen 3 together, the outer peripheral surface of the chuck 44 may also be provided with a protrusion engaging the gap.

The utility model also proposes a water heater, including a water inlet valve. The specific structure of the water inlet valve refers to the above-mentioned embodiments. Since the water heater adopts all the technical solutions of all the above-mentioned embodiments, it has at least the technical solutions of the above-mentioned embodiments. All the beneficial effects brought about will not be described one by one here.

The above are only preferred embodiments of the present utility model, and are not therefore limiting the patent scope of the present utility model. Under the inventive concept of the present utility model, the equivalent structural transformations made by utilizing the specification of the utility model and the contents of the accompanying drawings, or directly/ Indirect application in other relevant technical fields is included in the patent protection scope of the present utility model.

Claims (10)

1. A water inlet valve applied to a water heater, characterized in that the water inlet valve comprises: The first valve body has an inner cavity through which both ends are connected, and the two ends of the inner cavity are respectively a water inlet and a water outlet, and the peripheral surface of the first valve body is provided with an installation hole communicating with the inner cavity; A stabilizing component installed in the inner cavity, and the stabilizing component is used to stabilize the pressure of the fluid in the first valve body; A filter screen is installed in the inner cavity through the installation hole and traverses the flow surface of the inner cavity, and the flow stabilization component is located between the filter screen and the water outlet; The second valve body is embedded in the installation hole at one end, a pressure relief chamber is provided on the end surface of the second valve body away from the inner cavity, and a pressure relief chamber is provided on the other end surface to communicate with the pressure relief chamber and the inner cavity. a channel, the junction of the pressure relief channel and the pressure relief chamber forms a stepped surface facing away from the inner cavity; and, The pressure relief assembly is installed in the pressure relief chamber, the pressure relief assembly includes a plug, an elastic member and a fastener, the plug is adjacent to the step surface, and a pressure relief gap is formed on the plug; The fastener is fixed at one end of the pressure relief chamber away from the step surface, and the fastener is provided with a pressure relief hole; the elastic member is sandwiched between the plug and the fastener space, so that the plug elastically abuts against the stepped surface and seals the pressure relief hole. 2. The water inlet valve according to claim 1, wherein a groove is provided on the side of the plug facing the stepped surface, and there is a gap between the peripheral surface of the groove and the outer peripheral surface of the plug. An annular flange abutting against the stepped surface is formed. 3. The water inlet valve according to claim 2, wherein a first counterbore is provided on the side of the plug facing away from the stepped surface, and a first counterbore is provided on the side of the fastener facing the stepped surface. In the second counterbore, one end of the elastic member is embedded in the first counterbore, and the other end is embedded in the second counterbore. 4. The water inlet valve according to claim 3, wherein the fastening member is threadedly engaged with the pressure relief cavity, and the elastic member is a compression spring. 5. The water inlet valve according to claim 1, wherein a joint extends from the edge of the installation hole in a direction away from the first valve body, and the second valve body is embedded in the joint , one end of the filter screen adjacent to the second valve body is located in the installation hole. 6. The water inlet valve according to claim 5, wherein an annular groove is provided on the outer peripheral surface of a section of the second valve body embedded in the joint, and the water inlet valve also includes a A sealing ring, the sealing ring is in sealing fit with the inner wall surface of the joint. 7. The water inlet valve according to claim 6, wherein a positioning counterbore is provided on the wall surface of the inner cavity opposite to the installation hole, and the end of the filter screen away from the second valve body is located at The positioning counterbore. 8. The water inlet valve according to any one of claims 1-7, wherein the flow stabilization component comprises: a stopper protruding from the wall surface of the inner cavity, and the stopper extends circumferentially along the valve body and is arranged in an annular shape; The spool, the spool includes a core rod and a core ring protruding from the outer peripheral surface of one end of the core rod, the core ring is provided with a water tank hole, the valve core is fixed in the inner cavity and adjacent to the The stopper, the core ring is located at one end of the core rod away from the stopper; and The deformation ring is arranged in the inner cavity, the deformation ring is set on the core rod and limited between the stopper and the core ring, and the deformation ring is used to reduce its inner edge when the hydraulic pressure increases area to correspondingly reduce the water gap between the deformation ring and the core rod; The water gap between the core rods. 9. The water inlet valve according to any one of claims 1-7, wherein the filter screen includes a bracket and a mesh coated on the bracket, the bracket includes an inner ring, and the The inner ring is opposite to the outer ring, and several support rods connecting the inner ring and the outer ring, the mesh covers the side of the bracket away from the water inlet. 10. A water heater, characterized by comprising the water inlet valve according to any one of claims 1-9.