CN220102200U - Valve assembly and water heater - Google Patents

Abstract

The utility model provides a valve assembly and a water heater. The valve assembly comprises a shell, wherein a first fluid inlet and a first fluid outlet are respectively arranged at two ends of the shell; a throttle portion located at the first fluid outlet and extending toward the inside of the housing along a central axis of the housing; the valve core is provided with a second fluid inlet at one end facing the first fluid inlet, a second fluid outlet at one end facing the first fluid outlet, and the valve core can move between a first position and a second position along the central axis of the shell so as to adjust the gap area between the second fluid outlet and the throttling part; when the valve core is at the first position, the valve core is far away from the throttling part, and a through-flow space is formed between the second fluid outlet and the surface of the throttling part; when the valve core is in the second position, the valve core is close to the throttling part, and the valve core closes the first fluid outlet. Therefore, the water flow is regulated, the part is prevented from cracking, and the water supply can be timely interrupted after the part at the water outlet end is frozen and cracked.

Description

Valve assembly and water heater

Technical Field

The utility model relates to the field of valves, in particular to a valve assembly and a water heater.

Background

When the household water heater supplies water, the problem that the water flow in the pipeline is unstable is commonly existed. The water flow or water pressure fluctuation generated under the problem is light, so that the water outlet of the water heater is suddenly cold and hot, and the heavy water pressure fluctuation causes the part cracking caused by the overlarge water pressure. In addition to the risk of cracking of the parts, frost cracking of the parts at the water outlet end may occur due to excessively low ambient temperatures. The water heater in the prior art can continue to supply water according to the operation of a user without regard to the leakage risk of the frost crack of the parts at the water outlet end, and lacks a protection mechanism capable of timely interrupting water supply under the condition. Therefore, there is a need in the market for a protection mechanism that can regulate water flow to prevent part cracking and that can interrupt water supply in time after the part at the water outlet end has frozen cracking.

Disclosure of Invention

The utility model aims to solve the technical problems that in order to regulate the water flow, further prevent the parts from cracking, and timely interrupt water supply after the parts at the water outlet end are cracked by freezing, and provides a valve assembly and a water heater.

The utility model solves the technical problems by the following technical scheme:

a valve assembly, comprising:

the two ends of the shell are respectively provided with a first fluid inlet and a first fluid outlet;

a throttle portion located at the first fluid outlet and extending toward the inside of the housing along a central axis of the housing; and

the valve core is provided with a second fluid inlet at one end facing the first fluid inlet, a second fluid outlet at one end facing the first fluid outlet, and the valve core can move between a first position and a second position along the central axis of the shell so as to adjust the gap area between the second fluid outlet and the throttling part;

when the valve core is at the first position, the valve core is far away from the throttling part, and a through-flow space is formed between the second fluid outlet and the surface of the throttling part; when the valve core is in the second position, the valve core is close to the throttling part, and the valve core closes the first fluid outlet.

In this aspect, the first fluid inlet of the housing is the inlet through which fluid initially passes into the valve assembly and the first fluid outlet of the housing is the outlet through which fluid eventually passes out of the valve assembly; the second fluid inlet of the valve cartridge is a secondary inlet for fluid, i.e. fluid is introduced from the first fluid inlet into the valve assembly and then re-enters the second fluid inlet of the valve cartridge, which fluid is subsequently introduced from the second fluid outlet of the valve cartridge out of the valve assembly and subsequently introduced via the first fluid outlet out of the valve assembly. The first position is a starting position of the valve core, and when fluid enters the valve assembly from the first fluid inlet, water pressure of the fluid will act on the end face of the valve core, which is close to the first fluid inlet, so that the valve core is pushed towards the first fluid outlet, namely the valve core is moved from the first position towards the second position. In the process of moving the valve core from the first position to the second position, a through-flow space formed by the second fluid outlet of the valve core and the surface of the throttling part gradually becomes smaller along with the moving process of the valve core, namely the through-flow area of the valve assembly for fluid to pass through is gradually reduced. When the valve core moves to the second position, the valve core closes the first fluid outlet, so that the through-flow space is zero, i.e. no through-flow area is reserved. In this manner, when an abnormally sudden increase in water flow or water pressure to the valve assembly occurs, the valve assembly adjusts the through-flow space by moving the valve spool from the first position toward the second position to adjust the flow rate of the fluid such that the total through-flow remains unchanged; when the water pressure reaches the maximum value which can be born by the water supply system, the valve core is positioned at the second position, and the water supply is interrupted by closing the first fluid outlet, so that the part cracking caused by the overlarge water pressure is prevented. Similarly, when the parts of the water outlet end are frozen and cracked due to the too low ambient temperature, the water pressure at the water outlet end is suddenly reduced, so that the water pressure when the water is introduced into the valve assembly is far greater than the water pressure at the water outlet end, and the pressure difference also causes the valve core to move from the first position towards the second position, so that the first fluid outlet is closed and the water supply is interrupted when the valve core reaches the second position.

Preferably, a first elastic member is provided in the through-flow space, the first elastic member being provided between the spool and the housing in the direction of the center axis of the housing.

In this scheme, be provided with first elastic component in the through-flow space, first elastic component provides the force that pushes the case towards first position. Therefore, before the water pressure reaches the maximum value which can be born by the water supply system, water is normally introduced into the valve assembly, the valve core can be automatically regulated and can move back and forth between the first position and the second position by the elastic force provided by the first elastic piece, and further, the specific adjustment of the through-flow space is carried out according to the change of the water pressure, so that the steady flow effect is realized; when the water pressure reaches the maximum value and returns to normal again, the first elastic piece can push the valve core from the second position to the first position again, so that the valve core is reset, and the through-flow space is opened again to allow fluid to pass through. In this way, the valve core is automatically switched between the first position and the second position by the first elastic piece, and the valve core can be automatically adjusted according to the specific size of the water pressure.

Preferably, the throttling part is provided with a first elastic piece step, and one end of the first elastic piece is abutted against the first elastic piece step;

and/or the second fluid outlet is provided with an elastic element accommodating cavity, and the first elastic element is at least partially positioned in the elastic element accommodating cavity.

In this arrangement, the first resilient element is restrained in a designated position by the first resilient element step and/or the resilient element receiving cavity, preventing unwanted movement or sloshing of the first resilient element within the valve assembly such that the first resilient element more effectively provides a force urging the valve spool toward the first position.

Preferably, the valve assembly further comprises a limiting part, the limiting part is communicated to the inner wall of the shell from the outer wall of the shell, a clamping groove is formed in the outer wall of the valve core, and the clamping groove is matched with the limiting part so as to lock the valve core when moving to the second position.

In the scheme, the clamping groove is matched with the limiting part so as to lock the valve core when the valve core moves to the second position, and the valve core is prevented from returning to the first position from the master-slave second position. The fluctuation in water flow or pressure may be sustained and after the pressure of the water has initially reached the maximum level that the water supply can withstand and then has tended to stabilize, it is often the case that the pressure of the water reaches the maximum level that the water supply can withstand a second, third, etc. time. By locking the valve core at the second position when the water pressure initially reaches the maximum value which can be borne by the water supply system, the valve core is prevented from repeatedly approaching the second position and impacting the first fluid outlet, and further the protection of the whole structure is realized.

Preferably, the clamping groove surrounds the outer wall of the valve core around the central axis of the valve core;

and/or the position on the shell, which is provided with the limiting part, is provided with a limiting accommodating cavity, one end, which is far away from the shell, on the limiting part extends out of the limiting accommodating cavity, and a limiting moving space is formed between the inner wall of the limiting accommodating cavity and the outer wall of the limiting part.

In the scheme, the clamping groove surrounds the outer wall of the valve core around the central axis of the valve core, so that an annular clamping groove is formed. Therefore, even if the valve core rotates in the shell, the limiting part can still be accurately matched with the annular clamping groove without being influenced by the deflection of the clamping groove position, and the valve core is locked when moving to the second position. On the other hand, the movable space of the limiting part is limited in the limiting movable space by the limiting accommodating cavity, so that the limiting part is prevented from being accidentally separated from the valve assembly. One end of the limiting part far away from the shell extends out of the limiting accommodating cavity, so that an operator can manually pull the limiting part when needed, and the locking of the limiting part to the valve core is released.

Preferably, a second elastic piece is arranged in the limiting moving space, and the second elastic piece is arranged between the valve core and the shell in the direction vertical to the central axis of the shell.

In the scheme, a second elastic piece is arranged in the limiting moving space and provides force for pushing the limiting part towards the valve core. Therefore, when the valve core is located at the second position, the limiting part is automatically ejected out through the second elastic piece, and efficiency of locking the valve core by matching the limiting part with the clamping groove is improved.

Preferably, the limiting part is provided with a second elastic piece step, and one end of the second elastic piece is abutted against the second elastic piece step.

In the scheme, the second elastic piece is limited at the designated position through the second elastic piece step, so that the second elastic piece is prevented from unnecessarily moving or swaying in the limiting moving space, and the second elastic piece can more effectively provide the force for pushing the limiting part towards the valve core.

Preferably, when the valve element moves to the second position, the inner wall of the valve element abuts against the outer surface of the throttle portion.

In this scheme, through the inner wall of case and the surface looks butt of throttling part to when the case seals first fluid outlet, the inner wall of case forms secondary closure with throttling part's surface, and then has realized the better airtight effect to the fluid.

Preferably, a first stop extending towards the interior of the housing is provided at the first fluid inlet;

and/or a second stop extending towards the interior of the housing is provided at the first fluid outlet.

In this scheme, first backstop portion and second backstop portion have played the effect of anticreep to the case in the casing to avoided the valve subassembly to disintegrate in the use by accident.

A water heater comprising a valve assembly as claimed in any one of the preceding claims.

In this scheme, the water heater through being provided with foretell valve assembly, can adjust water flow and then prevent that the part from rising to split and can in time interrupt the water supply after the part of play water end takes place to freeze to split.

On the basis of conforming to the common knowledge in the field, the above preferred conditions can be arbitrarily combined to obtain the preferred embodiments of the present utility model.

The utility model has the positive progress effects that: the valve assembly and the water heater can regulate the water flow so as to prevent the parts from cracking, and can interrupt water supply in time after the parts at the water outlet end are frozen and cracked, so that the utility model has remarkable progress.

Drawings

FIG. 1 is a schematic perspective view of a valve assembly according to an embodiment of the present utility model;

FIG. 2 is a schematic cross-sectional view of a valve assembly according to an embodiment of the present utility model in a first position;

FIG. 3 is a schematic cross-sectional view of a valve assembly according to an embodiment of the present utility model in a second position;

FIG. 4 is a schematic perspective view of a valve core of a valve assembly according to an embodiment of the present utility model;

FIG. 5 is a schematic view of a valve assembly of an embodiment of the present utility model at a fluid outlet.

Reference numerals illustrate:

valve assembly 1000

Housing 10

First fluid inlet 11

First fluid outlet 12

Throttle part 13

Valve core 20

A second fluid inlet 21

Second fluid outlet 22

Through-flow space 200

First elastic member 30

First elastic member step 31

Spring receiving chamber 32

Limit part 40

Clamping groove 41

Limiting accommodation chamber 42

Spacing movement space 300

Second elastic member 50

Second elastic member step 51

First stop portion 61

Second stop portion 62

Detailed Description

The utility model is further illustrated by means of examples which follow, without thereby restricting the scope of the utility model thereto.

As shown in fig. 1-3, a valve assembly 1000 includes:

a housing 10, both ends of the housing 10 are provided with a first fluid inlet 11 and a first fluid outlet 12, respectively;

a throttle portion 13, the throttle portion 13 being located at the first fluid outlet 12 and extending along a central axis of the housing 10 toward the inside of the housing 10; and

a valve core 20, wherein a second fluid inlet 21 is arranged at one end of the valve core 20 facing the first fluid inlet 11, a second fluid outlet 22 is arranged at one end of the valve core 20 facing the first fluid outlet 12, and the valve core 20 can move between a first position and a second position along the central axis of the shell 10 so as to adjust the gap area between the second fluid outlet 22 and the throttling part 13;

wherein, when the valve core 20 is at the first position, the valve core 20 is far away from the throttling part 13, and the second fluid outlet 22 and the surface of the throttling part 13 form a through-flow space 200; when the spool 20 is in the second position, the spool 20 is adjacent the throttle portion 13, and the spool 20 closes the first fluid outlet 12.

In particular implementations, the first fluid inlet 11 of the housing 10 is the inlet through which fluid initially passes into the valve assembly 1000, and the first fluid outlet 12 of the housing 10 is the outlet through which fluid eventually passes out of the valve assembly 1000; the second fluid inlet 21 of the valve cartridge 20 is a secondary inlet for fluid, i.e. fluid from the first fluid inlet 11 passes into the valve assembly 1000 and then re-enters the second fluid inlet 21 of the valve cartridge 20, which fluid then passes out of the valve cartridge 20 from the second fluid outlet 22 of the valve cartridge 20 and then out of the valve assembly 1000 via the first fluid outlet 12. The first position is a starting position of the valve element 20, and when fluid enters the valve assembly 1000 from the first fluid inlet 11, the water pressure of the fluid itself will act on the end surface of the valve element 20 near the first fluid inlet 11, thereby pushing the valve element 20 toward the first fluid outlet 12, i.e. moving the valve element 20 from the first position toward the second position. During movement of the valve spool 20 from the first position toward the second position, the through-flow space 200 formed by the second fluid outlet 22 of the valve spool 20 and the surface of the throttle portion 13 gradually becomes smaller as the valve spool 20 moves, i.e., gradually reduces the through-flow area available for fluid to pass through the interior of the valve assembly 1000. When the spool 20 moves to the second position, the spool 20 closes the first fluid outlet 12 such that the through-flow space 200 is zero, i.e., no flow area is left. In this manner, when an abnormal abrupt increase in water flow rate or water pressure to the valve assembly 1000 occurs, the valve assembly 1000 adjusts the flow rate of the fluid by moving the valve spool 20 from the first position toward the second position to adjust the flow space 200 such that the total flow rate remains unchanged; when the water pressure reaches the maximum level that the water supply system can withstand, the valve element 20 is in the second position, and the water supply is interrupted by closing the first fluid outlet 12, so that the parts are prevented from cracking due to excessive water pressure. Similarly, when the parts at the water outlet end are frozen due to too low an ambient temperature, the water pressure at the water outlet end is reduced sharply, and the water pressure at the water outlet end is much greater than the water pressure at the water outlet end when the valve assembly 1000 is opened, the pressure difference also causes the valve element 20 to move from the first position toward the second position, thereby closing the first fluid outlet 12 and interrupting the water supply when the valve element 20 reaches the second position. The valve assembly 1000 in the present embodiment is a valve assembly 1000 unit based on one housing 10 and one valve core 20, and in practice, a person skilled in the art may use a plurality of the valve assembly 1000 units according to actual needs, so as to meet the actual needs in a multi-pipe situation or large-area laying, which is not limited in the present embodiment. In this embodiment, the housing 10 and the valve core 20 are both straight cylinders, and as an alternative embodiment, both the housing 10 and the valve core 20 may have a certain arc, so that a state similar to a "C" shape is presented, and on the premise of not affecting the normal operation of the valve assembly 1000, a person skilled in the art may choose whether to set the arc and the specific size of the arc according to the actual requirement, which is not limited in this embodiment. On the other hand, in this embodiment, the outermost wall surface of the valve core 20 is attached to the inner wall of the housing 10, so that a good sealing effect is achieved between the housing 10 and the valve core 20, and further, the pushing effect can be more fully and effectively exerted when the water pressure of the fluid acts on the valve core 20 near the end surface of the first fluid inlet 11. Alternatively, a gap may be formed between the wall surface of the outermost edge of the valve core 20 and the inner wall of the housing 10, so that the hydraulic pressure of the fluid acts on the end surface of the valve core 20 near the first fluid inlet 11 to push the valve core 20 to the second position, and a coating or film that is commonly used in the art and can perform sealing and lubrication functions, such as graphite or vaseline, may be used between the above gaps, which is not limited in this embodiment. Further, in the present embodiment, the fluid channel between the second fluid inlet and the second fluid outlet is a flat and smooth surface, however, those skilled in the art may also use a protrusion for preventing turbulence or a guide plate for guiding the fluid in the fluid channel according to actual requirements, which is not limited in this embodiment.

As shown in fig. 2 and 3, a first elastic member 30 is provided in the through-flow space 200, the first elastic member being provided between the spool 20 and the housing 10 in the center axis direction of the housing 10.

In particular, a first resilient member 30 is disposed in the through-flow space 200, the first resilient member 30 providing a force urging the valve spool 20 toward the first position. Therefore, before the water pressure reaches the maximum value which can be borne by the water supply system, water is normally introduced into the valve assembly 1000, the elastic force provided by the first elastic piece 30 enables the valve core 20 to be automatically adjusted and reciprocate between the first position and the second position, and further, specific adjustment of the through-flow space 200 is performed according to the change of the water pressure, so that the steady flow effect is realized; when the water pressure reaches the maximum value and returns to normal again, the first elastic member 30 can push the valve core 20 from the second position to the first position again, so that the valve core 20 is reset, and the through-flow space 200 is opened again to allow the fluid to pass. In this way, the valve core 20 is automatically switched between the first position and the second position by the first elastic member 30, and is capable of being autonomously adjusted for the specific magnitude of the water pressure. The first elastic member 30 in the present embodiment is a spring, and the spring provides a preloaded elastic force between the valve core 20 and the housing 10 to push the valve core 20 to the first position. As an alternative embodiment, a person skilled in the art may also use an elastic member such as a tension spring or an elastic rubber ring, which is commonly known in the art, to provide the force for pushing the valve core 20 toward the first position, which is not limited in this embodiment.

As shown in fig. 2 and 3, the throttle portion 13 is provided with a first elastic member step 31, and one end of the first elastic member 30 abuts against the first elastic member step 31;

the second fluid outlet 22 is provided with an elastic member receiving chamber 32, and the first elastic member 30 is partially located in the elastic member receiving chamber 32.

In particular implementations, by defining the first spring 30 in a designated position by the first spring step 31 and the spring receiving cavity 32, unwanted movement or sloshing of the first spring 30 within the valve assembly 1000 is prevented such that the first spring 30 more effectively provides a force urging the valve spool 20 toward the first position. In this embodiment, the valve assembly 1000 employs both the first elastic member step 31 and the elastic member receiving cavity 32, so as to better define the first elastic member 30 at a specified position, and one of the first elastic member step 31 or the elastic member receiving cavity 32 may be selected to be disposed according to actual needs by those skilled in the art, which is not limited in this embodiment.

As shown in fig. 2 and 3, the valve assembly 1000 further includes a limiting portion 40, the limiting portion 40 is connected to the inner wall of the housing 10 from the outer wall of the housing 10, a clamping groove 41 is provided on the outer wall of the valve core 20, and the clamping groove 41 cooperates with the limiting portion 40 to lock the valve core 20 when moving to the second position.

In particular, the detent 41 cooperates with the stop 40 to lock the valve core 20 when it is moved to the second position, preventing the valve core 20 from returning from the master-slave second position to the first position. The fluctuation in water flow or pressure may be sustained and after the pressure of the water has initially reached the maximum level that the water supply can withstand and then has tended to stabilize, it is often the case that the pressure of the water reaches the maximum level that the water supply can withstand a second, third, etc. time. By locking the valve spool 20 in the second position when the water pressure initially reaches the maximum sustainable level of the water supply, repeated approximation of the valve spool 20 to the second position and impact on the first fluid outlet 12 is prevented, thereby achieving protection of the overall structure.

As shown in fig. 2-4, the catch groove 41 surrounds the outer wall of the valve core 20 around the central axis of the valve core 20;

and/or, the position on the shell, where the limiting part 40 is arranged, is provided with a limiting accommodating cavity 42, one end, far away from the shell, on the limiting part 40 extends out of the limiting accommodating cavity 42, and a limiting moving space 300 is formed between the inner wall of the limiting accommodating cavity 42 and the outer wall of the limiting part 40.

In particular embodiments, the catch 41 surrounds the outer wall of the valve core 20 about the central axis of the valve core 20, forming an annular catch 41. Therefore, even if the valve body 20 rotates in the housing 10, the stopper 40 can be accurately engaged with the annular locking groove 41 without being affected by the positional deviation of the locking groove 41, and the valve body 20 can be locked when moving to the second position. On the other hand, the limit accommodating chamber 42 limits the movable space of the limit part 40 in the limit movement space 300, preventing the limit part 40 from being accidentally removed from the valve assembly 1000. One end of the limiting part 40 far away from the shell extends out of the limiting accommodating cavity 42, so that an operator can manually pull the limiting part 40 when needed, and the locking of the limiting part 40 to the valve core 20 is released. In this embodiment, the end of the limiting portion 40 far from the housing is simply configured, and a person skilled in the art may set a design commonly used in the art, such as an anti-slip line or a pull ring, at the end according to specific requirements, so that the limiting portion 40 is more easily pulled or pushed by an operator, which is not limited in this embodiment.

As shown in fig. 2 and 3, a second elastic member 50 is provided in the limit movement space 300, and the second elastic member 50 is provided between the spool 20 and the housing 10 in a direction perpendicular to the central axis of the housing 10.

In particular, the second elastic member 50 is disposed in the limit movement space 300, and the second elastic member 50 provides a force pushing the limit portion 40 toward the valve core 20. Therefore, when the valve core 20 is located at the second position, the limiting part 40 is automatically ejected through the second elastic piece 50, so that the efficiency of locking the valve core 20 by matching the limiting part 40 with the clamping groove 41 is improved. The second elastic member 50 in this embodiment is a spring, and the spring provides a preloaded elastic force to push the limiting portion 40 toward the valve core 20. As an alternative embodiment, a person skilled in the art may also use an elastic member such as a tension spring or an elastic rubber ring, which is commonly known in the art, to provide the force for pushing the stopper 40 toward the valve core 20, which is not limited in this embodiment.

As shown in fig. 2 and 3, the stopper 40 is provided with a second elastic member step 51, and one end of the second elastic member 50 abuts against the second elastic member step 51.

In particular, the second elastic member 50 is restricted to a designated position by the second elastic member step 51, and unnecessary movement or shaking of the second elastic member 50 inside the limit movement space 300 is prevented, so that the second elastic member 50 more effectively provides a force pushing the limit portion 40 toward the valve core 20.

As shown in fig. 3, when the valve body 20 moves to the second position, the inner wall of the valve body 20 abuts against the outer surface of the throttle portion 13.

In a specific implementation, the inner wall of the valve core 20 abuts against the outer surface of the throttling part 13, so that when the valve core 20 closes the first fluid outlet 12, the inner wall of the valve core 20 and the outer surface of the throttling part 13 form secondary closure, and a better sealing effect on fluid is achieved. On the other hand, in the present embodiment, the inner wall of the valve body 20 is bonded to the outer surface of the throttle portion 13 when the valve body 20 is in the second position, so that a good sealing effect is achieved between the valve body 20 and the throttle portion 13. Alternatively, a gap may be formed between the inner wall of the valve core 20 and the outer surface of the throttle 13, and a coating or film capable of performing sealing and lubrication, such as graphite or vaseline, which is commonly used in the art, may be used between the gaps, which is not limited in this example.

As shown in fig. 2, 3 and 5, a first stopper 61 extending toward the inside of the housing 10 is provided at the first fluid inlet 11;

a second stop 62 is provided at the first fluid outlet 12 extending towards the interior of the housing 10.

In particular implementations, the first and second stops 61, 62 provide an anti-slip effect on the valve cartridge 20 within the housing 10, thereby avoiding inadvertent disassembly of the valve assembly 1000 during use. In this embodiment, the second stop portion 62 is also a connecting portion for connecting the throttle portion 13 to the housing, and the second stop portion 62 has a bar-shaped barrier structure, so that the first fluid outlet 12 is divided into a plurality of openings. In the present embodiment, the first stop portion 61 is an annular structure, which is made by turning the outer shell directly toward the inside of the housing 10. However, in the specific implementation, those skilled in the art may also use a conventional stop structure in the art to make modifications or substitutions on the first stop portion 61 and the second stop portion 62 according to actual needs, for example, using a grid structure stop portion, which is not limited in this embodiment.

Not shown in the figures, a water heater includes a valve assembly 1000 of any of the above.

In a specific implementation, the water heater can regulate the water flow through the valve assembly 1000, so that the part is prevented from cracking, and the water supply can be timely interrupted after the part at the water outlet end is frozen and cracked.

While specific embodiments of the utility model have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and the scope of the utility model is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the principles and spirit of the utility model, but such changes and modifications fall within the scope of the utility model.

Claims (10)

1. A valve assembly, the valve assembly comprising:

the two ends of the shell are respectively provided with a first fluid inlet and a first fluid outlet;

a throttle portion located at the first fluid outlet and extending along a central axis of the housing toward an inside of the housing; and

a valve core, wherein a second fluid inlet is arranged at one end of the valve core facing the first fluid inlet, a second fluid outlet is arranged at one end of the valve core facing the first fluid outlet, and the valve core can move between a first position and a second position along the central axis of the shell so as to adjust the gap area between the second fluid outlet and the throttling part;

when the valve core is at the first position, the valve core is far away from the throttling part, and the second fluid outlet, the surface of the throttling part and the inner wall of the shell form a through-flow space; when the valve spool is in the second position, the valve spool is adjacent the restriction, the valve spool closing the first fluid outlet.

2. The valve assembly of claim 1, wherein a first elastic member is disposed in the through-flow space, the first elastic member being disposed between the spool and the housing in a direction of a central axis of the housing.

3. The valve assembly of claim 2, wherein the restriction is provided with a first spring step against which one end of the first spring is seated;

and/or, an elastic piece accommodating cavity is arranged at the second fluid outlet, and the first elastic piece is at least partially positioned in the elastic piece accommodating cavity.

4. The valve assembly of claim 1, further comprising a stop portion from an outer wall of the housing and communicating to an inner wall of the housing, the outer wall of the valve cartridge being provided with a catch thereon that cooperates with the stop portion to lock the valve cartridge when moved to the second position.

5. The valve assembly of claim 4, wherein the detent surrounds an outer wall of the valve spool about a central axis of the valve spool;

and/or, the position on the shell, which is provided with the limiting part, is provided with a limiting accommodating cavity, one end, which is far away from the shell, on the limiting part extends out of the limiting accommodating cavity, and a limiting moving space is formed between the inner wall of the limiting accommodating cavity and the outer wall of the limiting part.

6. The valve assembly of claim 5, wherein a second elastic member is disposed in the limited movement space, the second elastic member being disposed between the spool and the housing in a direction perpendicular to a central axis of the housing.

7. The valve assembly of claim 6, wherein the retainer portion is provided with a second spring step against which one end of the second spring abuts.

8. The valve assembly of any one of claims 1-7, wherein an inner wall of the valve spool abuts an outer surface of the restriction when the valve spool is moved to the second position.

9. The valve assembly of any one of claims 1-7, wherein the first fluid inlet is provided with a first stop extending toward the interior of the housing;

and/or a second stop extending towards the interior of the housing is provided at the first fluid outlet.

10. A water heater comprising a valve assembly as claimed in any one of claims 1 to 9.