One-way valve and gas water heater system including the same

Abstract

The present invention discloses a one-way valve and a gas water heater system including the one-way valve. The one-way valve comprises: a shell and a valve core assembly, a linkage assembly, a guide assembly and a blocking assembly arranged in the shell, the shell having a first fluid inlet and a fluid outlet; the valve core assembly is used to make the fluid flow from the first fluid inlet to the shell in a one-way direction; the valve core of the valve core assembly acts on the linkage assembly to drive the blocking assembly to leave or approach the fluid outlet; the guide assembly is used to limit the moving track of the blocking assembly; the blocking assembly is used to reduce the flow area of ​​the fluid flowing out of the fluid outlet when the blocking assembly approaches the fluid outlet. By setting the specific structure of the one-way valve, it can be avoided that the resistance of the cold water interface at the water-using end is less than the resistance of the hot water interface, and the water heater can be prevented from starting accidentally.

Description

Technical Field

[0001] The invention relates to the field of water heaters, and in particular to a one-way valve and a gas water heater system comprising the one-way valve. Background Art

[0002] In the prior art, the working principle of a water heater with a zero cold water function (a circulating water heater without a return pipe) and its water system is: when the user is not using hot water, the water heater detects that the water temperature in the pipe is lower than the set temperature and starts the circulating water pump in the water heater. After the water pump starts running, the water in the pipe will flow into the water heater for heating. After the water in the pipe is heated to the specified temperature, the water pump stops running and the water heater also stops working.

[0003] like Figure 1 As shown, in a household without a return pipe installed, the current gas water heater 110 will find the water end 120 at the farthest end of the waterway in the household during installation. The water end 120 can be a faucet. The hot water pipe 150 is connected to the cold water pipe 130 under this faucet. In order to prevent cold water from flowing back into the hot water pipe 150 when using hot water, a one-way valve 140 will be installed here. This connection method is effective in some households. However, this requires a condition to be met, that is: the water resistance Z1 of the hot water pipe 150 to the last faucet is greater than the water resistance Z2 of the cold water pipe 130 to the last faucet. Now, in many households, the water resistance Z1 of the hot water pipe 150 to the last faucet is smaller than the water resistance Z2 of the cold water pipe 130 to the last faucet. In this case, at the last faucet, when the user turns on the cold water, part of the water flow will flow from the cold water waterway, and the other part will flow from the hot water waterway. Even all the water flows from the hot water waterway. This will cause the water heater to start, and when the user wants to use cold water, hot water will be produced, causing great trouble to the user. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the above-mentioned defect of "needing cold water but flowing out hot water" in the water heater circulation system of the prior art that uses a one-way valve to connect the hot water pipe and the cold water pipe, and to provide a one-way valve and a gas water heater system containing the same.

[0005] The present invention solves the above technical problems through the following technical solutions:

[0006] A one-way valve, characterized in that it comprises: a housing and a valve core assembly, a linkage assembly, a guide assembly and a blocking assembly arranged in the housing;

[0007] The housing has a first fluid inlet and a fluid outlet;

[0008] The valve core assembly is used to allow the fluid to flow from the first fluid inlet into the housing in a unidirectional manner;

[0009] The valve core of the valve core assembly acts on the linkage assembly to drive the blocking assembly to leave or approach the fluid outlet;

[0010] The guide component is used to limit the moving track of the blocking component;

[0011] The blocking component is used to reduce the flow area of ​​the fluid flowing out of the fluid outlet when the blocking component is close to the fluid outlet.

[0012] In the present technical solution, the linkage assembly is driven by the valve core, and the linkage assembly in turn drives the blocking assembly to approach the fluid outlet, thereby reducing the flow area of ​​the fluid outlet, thereby increasing the fluid resistance at the fluid outlet, and avoiding the situation where the water outlet resistance is too small when water flows out of the fluid outlet of the one-way valve; and, in this process, the moving trajectory of the blocking assembly is limited by the guide assembly, so that the blocking assembly can move smoothly along the preset route.

[0013] Preferably, the linkage assembly includes a rotating shaft, and a gear and a rack meshing with each other, the rack is arranged on a valve stem connected to the valve core, and the gear drives the blocking assembly to move through the rotating shaft.

[0014] In the technical solution, by setting the specific structure of the linkage assembly, a stable and reliable transmission is provided for driving the blocking assembly to move.

[0015] Preferably, a fixing seat is further provided in the housing, the linkage assembly further comprises a rotating component, the rotating shaft is passed through the fixing seat, the gear and the rotating component are respectively located on both sides of the fixing seat and are respectively fixed to both ends of the rotating shaft, and the blocking assembly is linked with the rotating component;

[0016] The guide assembly comprises a slide rail and a rotating bracket, wherein the slide rail and the rotating bracket are both arranged on the fixed seat, the blocking assembly is penetrated on the rotating bracket, and the first end of the blocking assembly is slidably arranged in the slide rail.

[0017] In the technical solution, by setting a fixed seat, support can be provided for the rotating shaft. By setting a specific structure of the guide component to limit the moving track of the blocking component, the blocking component can be moved smoothly along a preset route. By setting both the slide rail and the rotating bracket on the fixed seat, the overall structure is made more compact.

[0018] Preferably, the housing further has a second fluid inlet, and when the valve core component cuts off the fluid from flowing into the housing from the first fluid inlet, the blocking component is located at the second fluid inlet;

[0019] The slide rail comprises a first section, an arc section and a second section connected in sequence, the first section is arranged along the axial direction of the second fluid inlet, and the second section is arranged along the axial direction of the fluid outlet;

[0020] The rotating component is provided with a moving groove, and the first end of the blocking component is inserted into the moving groove.

[0021] In this technical solution, the specific structure of the slide rail is provided to provide a more stable path for the second fluid inlet and the fluid outlet. The moving groove is provided on the rotating component to ensure that the blocking component can move smoothly in the slide rail.

[0022] Preferably, the valve core assembly further comprises a valve seat and a first elastic member, the valve core abuts against the valve seat to cut off the fluid from flowing into the housing from the first fluid inlet, and the first elastic member biases the valve core in a direction that makes the valve core approach the valve seat.

[0023] Preferably, the housing further has a second fluid inlet, and when the valve core component cuts off the fluid from flowing into the housing from the first fluid inlet, the blocking component is located at the second fluid inlet;

[0024] The blocking component includes a blocking part, a moving part and a second elastic part. The blocking part is used to reduce the flow area of ​​the fluid flowing out of the fluid outlet when the blocking part is close to the fluid outlet. One end of the moving part is slidably connected to the blocking part, and the other end is linked to the linkage component. The second elastic part biases the blocking part in a direction that makes the blocking part close to the second fluid inlet.

[0025] Preferably, the shell has an outlet reducing section, the small end of the outlet reducing section faces the fluid outlet, and the blocking component is close to the fluid outlet along the reducing section to reduce the flow area of ​​the fluid flowing out of the fluid outlet.

[0026] In the technical solution, the flow area can be the area of ​​the cross section of the outlet diameter reducing section minus the area of ​​the cross section of the blocking component at the corresponding position. When the blocking component approaches the fluid outlet, the cross section area of ​​the outlet diameter reducing section decreases in the direction of approaching the fluid outlet, while the cross section area of ​​the blocking component remains unchanged, thereby reducing the flow area and increasing the fluid resistance at the fluid outlet.

[0027] Preferably, the shell includes a main body, the main body is a sphere, the first fluid inlet and the fluid outlet are both connected to the main body, and the outlet diameter-reducing section is located between the fluid outlet and the main body.

[0028] In the technical solution, through the above arrangement, a shell structure with simple structure and convenient processing is provided.

[0029] Preferably, the one-way valve is used in a gas water heater system, the first fluid inlet is connected to a hot water interface at a water-using end of the gas water heater system, and the fluid outlet is connected to a cold water interface at a water-using end of the gas water heater system.

[0030] A gas water heater system, characterized in that it comprises the one-way valve as described above, a gas water heater and a water end;

[0031] The housing also has a second fluid inlet;

[0032] The first fluid inlet is connected to the hot water interface of the water-using end of the gas water heater system, the fluid outlet is connected to the cold water interface of the water-using end of the gas water heater system, and the second fluid inlet is connected to the cold water inlet of the gas water heater.

[0033] The positive and progressive effects of the present invention are:

[0034] The one-way valve of the present invention drives the linkage assembly through the valve core, and the linkage assembly drives the blocking assembly to approach the fluid outlet, so that the flow area of ​​the fluid outlet becomes smaller, thereby increasing the fluid resistance at the fluid outlet, and avoiding that the resistance of the water outlet is too small when the fluid outlet of the one-way valve discharges water; and in this process, the moving track of the blocking assembly is limited by the guide assembly, so that the blocking assembly can move smoothly along the preset route. The gas water heater system using the one-way valve can avoid the problem of "needing cold water but flowing out hot water" because the resistance of the cold water interface at the water end is smaller than the resistance of the hot water interface, and can also avoid accidental start-up of the water heater. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 The figure is a schematic diagram of the water path connection of the gas water heater in the prior art.

[0036] Figure 2 The figure is a schematic structural diagram of a gas water heater system according to a preferred embodiment of the present invention.

[0037] Figure 3 The figure is a schematic diagram of the three-dimensional structure of a one-way valve according to a preferred embodiment of the present invention.

[0038] Figure 4 The figure is a schematic cross-sectional structure diagram of a one-way valve according to a preferred embodiment of the present invention.

[0039] Figure 5 It is a three-dimensional structural schematic diagram of the valve core assembly, linkage assembly, guide assembly and blocking assembly of a one-way valve according to a preferred embodiment of the present invention.

[0040] Figure 6 The figure is a schematic cross-sectional structure diagram of a one-way valve in a circulation state according to a preferred embodiment of the present invention.

[0041] Figure 7 This is a schematic cross-sectional structure diagram of a one-way valve in a cold water state according to a preferred embodiment of the present invention.

[0042] Description of Reference Numerals

[0043] Gas Water Heater System 100

[0044] Gas water heater 110

[0045] Water end 120

[0046] Cold water pipe 130

[0047] Check valve 140

[0048] Hot water pipe 150

[0049] Check valve 200

[0050] Housing 210

[0051] First fluid inlet 211

[0052] Second fluid inlet 212

[0053] Fluid outlet 213

[0054] Outlet reducer 214

[0055] Main body 215

[0056] Valve core assembly 220

[0057] Valve core 221

[0058] Valve stem 222

[0059] Valve seat 223

[0060] The first elastic member 224

[0061] Valve bracket 225

[0062] Linkage component 240

[0063] Shaft 241

[0064] Gear 242

[0065] Rack 243

[0066] Rotating parts 244

[0067] Mobile slot 2441

[0068] Guide assembly 250

[0069] Slide 251

[0070] First paragraph 2511

[0071] Arc segment 2512

[0072] Second paragraph 2513

[0073] Rotating bracket 252

[0074] Blocking assembly 260

[0075] Blocking member 261

[0076] Moving Parts 262

[0077] The second elastic member 263

[0078] First end 264

[0079] Fixed seat 270 DETAILED DESCRIPTION

[0080] The present invention is further described below by way of examples, but the present invention is not limited to the scope of the examples.

[0081] like Figure 2 As shown, this embodiment provides a gas water heater system 100. The gas water heater system 100 includes a gas water heater 110, a water end 120, a one-way valve 200, a hot water pipe 150 and a cold water pipe 130. The water end 120 can generally be in the form of a faucet or a shower head, and the water end 120 has a cold water interface and a hot water interface. The cold water pipe 130 is used to supply cold water, and the cold water here refers to cold water that has not been heated by the gas water heater 110, rather than that its temperature must be lower than a certain value. The cold water pipe 130 is generally connected to the municipal water supply system.

[0082] The one-way valve 200 is disposed in a pipeline connecting the cold water pipe 130 and the hot water pipe 150 of the water use end 120 farthest from the gas water heater 110 in the gas water heater system 100 .

[0083] like Figure 3-Figure 7As shown, the one-way valve 200 includes: a housing 210 and a valve core assembly 220, a linkage assembly 240, a guide assembly 250 and a blocking assembly 260 arranged in the housing 210. The housing 210 has a first fluid inlet 211 and a fluid outlet 213. The valve core assembly 220 is used to allow the fluid to flow from the first fluid inlet 211 to the housing 210 in a one-way manner. The valve core 221 of the valve core assembly 220 acts on the linkage assembly 240 to drive the blocking assembly 260 to leave or approach the fluid outlet 213. The guide assembly 250 is used to limit the moving track of the blocking assembly 260. The blocking assembly 260 is used to reduce the flow area of ​​the fluid flowing out of the fluid outlet 213 when the blocking assembly 260 is close to the fluid outlet 213.

[0084] The one-way valve 200 of this embodiment drives the linkage assembly 240 through the valve core 221, and the linkage assembly 240 drives the blocking assembly 260 to approach the fluid outlet 213, thereby reducing the flow area of ​​the fluid outlet 213, thereby increasing the fluid resistance at the fluid outlet 213, and avoiding that the resistance to water outlet is too small when water flows out of the fluid outlet 213 of the one-way valve 200; and, in this process, the moving trajectory of the blocking assembly 260 is limited by the guide assembly 250, so that the blocking assembly 260 can move smoothly along the preset route.

[0085] The housing 210 also has a second fluid inlet 212. The first fluid inlet 211 of the one-way valve 200 is connected to the hot water interface of the water end 120 of the gas water heater system 100, the fluid outlet 213 is connected to the cold water interface of the water end 120 of the gas water heater system 100, and the second fluid inlet 212 is connected to the cold water inlet of the gas water heater 110.

[0086] In this embodiment, the housing 210 includes a main body 215, the main body 215 is a sphere, and the first fluid inlet 211, the second fluid inlet 212 and the fluid outlet 213 are all connected to the main body 215. Through the above configuration, a housing 210 structure with a simple structure and convenient processing is provided. In addition, by setting the main body 215 as a sphere, it is convenient to accommodate the linkage assembly 240, the guide assembly 250 and the blocking assembly 260, and the movement of the blocking assembly 260 therein. In addition, since the sphere has no corners, it will not add additional resistance to the water flow.

[0087] The housing 210 has an outlet reducing section 214, the small end of which faces the fluid outlet 213, and the blocking assembly 260 approaches the fluid outlet 213 along the reducing section to reduce the flow area of ​​the fluid flowing out of the fluid outlet 213. The flow area can be the area of ​​the cross section of the outlet reducing section 214 minus the area of ​​the cross section of the corresponding position of the blocking assembly 260. In the process of the blocking assembly 260 approaching the fluid outlet 213, the area of ​​the cross section of the outlet reducing section 214 decreases in the direction of approaching the fluid outlet 213, while the area of ​​the cross section of the blocking assembly 260 remains unchanged, so that the flow area decreases, thereby increasing the fluid resistance at the fluid outlet 213. The outlet reducing section 214 is located between the fluid outlet 213 and the main body 215.

[0088] The valve core assembly 220 further includes a valve stem 222 connected to the valve core 221, and one end of the valve stem 222 away from the valve core 221 acts on the linkage assembly 240. The valve core assembly 220 further includes a valve seat 223 and a first elastic member 224, the valve core 221 abuts against the valve seat 223 to cut off the fluid from the first fluid inlet 211 to the fluid flowing into the housing 210, and the first elastic member 224 biases the valve core 221 in a direction that makes the valve core 221 close to the valve seat 223. The first elastic member 224 can be specifically a spring.

[0089] In this embodiment, the linkage assembly 240 includes a rotating shaft 241, and a gear 242 and a rack 243 that mesh with each other. The rack 243 is disposed on the valve stem 222, and the rack 243 extends along the movement direction of the valve stem 222. The gear 242 drives the blocking assembly 260 to move through the rotating shaft 241. By setting the specific structure of the linkage assembly 240, a stable and reliable transmission is provided for driving the blocking assembly 260 to move.

[0090] In other embodiments, the linkage assembly 240 may also be in other forms, such as: a slider and a guide rail that cooperate with each other, the slider is slidably arranged on the guide rail, the valve stem drives the slider to move along the guide rail, and the moving slider pushes the blocking assembly 260 to approach the fluid outlet 213.

[0091] A fixing seat 270 is also provided in the housing 210, and the linkage assembly 240 further includes a rotating component 244. The rotating shaft 241 is provided through the fixing seat 270, and the gear 242 and the rotating component 244 are respectively located on both sides of the fixing seat 270 and are respectively fixed to both ends of the rotating shaft 241, and the blocking assembly 260 is linked with the rotating component 244. By providing the fixing seat 270, support can be provided for the rotating shaft 241. The fixing seat 270 can be fixed to the inner wall of the housing 210 by a fixing bracket.

[0092] The guide assembly 250 includes a slide rail 251 and a rotating bracket 252, both of which are arranged on a fixed seat 270, and a blocking assembly 260 is arranged on the rotating bracket 252, and a first end 264 of the blocking assembly 260 is slidably arranged in the slide rail 251. By setting a specific structure of the guide assembly 250, the moving track of the blocking assembly 260 is limited, so that the blocking assembly 260 can move smoothly along a preset route. By setting both the slide rail 251 and the rotating bracket 252 on the fixed seat 270, the overall structure is made more compact.

[0093] Preferably, when the valve core assembly 220 cuts off the fluid from flowing into the housing 210 from the first fluid inlet 211, the blocking assembly 260 is located at the second fluid inlet 212. That is, when the valve core 221 abuts against the valve seat 223, the blocking assembly 260 is located at the second fluid inlet 212. By arranging the blocking assembly 260 at the second fluid inlet 212, the pressure difference between the two sides can be better withstood. However, it is not limited thereto. In other embodiments, the blocking assembly 260 can also be arranged at any position between the second fluid inlet 212 and the fluid outlet 213.

[0094] Specifically, the blocking component 260 includes a blocking component 261, a moving component 262, and a second elastic component 263. The blocking component 261 is used to reduce the flow area of ​​the fluid flowing out of the fluid outlet 213 when the blocking component 261 is close to the fluid outlet 213. One end of the moving component 262 is slidably connected to the blocking component 261, and the other end is linked to the linkage component 240. The second elastic component 263 biases the blocking component 261 in a direction that makes the blocking component 261 close to the second fluid inlet 212. The second elastic component 263 can be a spring. Specifically, after one end of the moving component 262 close to the rotating component 244 passes through the moving groove 2441, it is slidably arranged in the slide rail 251.

[0095] That is, when the valve core 221 abuts against the valve seat 223, the blocking component 261 is located at the second fluid inlet 212. By arranging the blocking component 261 at the second fluid inlet 212, the pressure difference between the two sides can be better resisted. When the valve core 221 leaves the valve seat 223, the valve core 221 drives the linkage assembly 240, and the linkage assembly 240 drives the blocking component 261 away from the second fluid inlet 212 and close to the fluid outlet 213.

[0096] It should be noted that since the movable component 262 is linked with the linkage assembly 240, in order to prevent the fluid from flowing back out of the first fluid inlet 211 when flowing into the shell 210 from the second fluid inlet 212, the second elastic component 263 is provided to prevent the movement of the blocking component 261 from driving the movement of the movable component 262, thereby preventing the valve core assembly 220 from moving through the reverse linkage between the movable component 262 and the linkage assembly 240, thereby opening the first fluid inlet 211 to generate backflow.

[0097] When the valve core assembly 220 cuts off the fluid from flowing into the housing 210 from the first fluid inlet 211, the blocking assembly 260 is located at the second fluid inlet 212. The slide rail 251 of the guide assembly 250 includes a first section 2511, an arc section 2512, and a second section 2513 connected in sequence. The first section 2511 is arranged along the axial direction of the second fluid inlet 212, and the second section 2513 is arranged along the axial direction of the fluid outlet 213. By setting the specific structure of the slide rail 251, a path that can more smoothly flow through the second fluid inlet 212 and the fluid outlet 213 is provided.

[0098] The rotating member 244 is provided with a moving groove 2441, and the first end 264 of the blocking assembly 260 is inserted into the moving groove 2441. By providing the moving groove 2441 on the rotating member 244, it is ensured that the blocking assembly 260 can move smoothly in the slide rail 251.

[0099] Please refer to Figure 2 In the gas water heater system 100 of this embodiment, the first fluid inlet 211 of the one-way valve 200 is connected to the hot water interface of the water use end 120 of the gas water heater system 100, the fluid outlet 213 is connected to the cold water interface of the water use end 120 of the gas water heater system 100, and the second fluid inlet 212 is connected to the cold water inlet of the gas water heater 110.

[0100] The working modes of the one-way valve 200 and the gas water heater system 100 are briefly described below.

[0101] When the water end 120 is closed, the state of the one-way valve 200 is as follows: Figure 4 As shown, there is no fluid flow in the one-way valve 200 .

[0102] When the gas water heater system 100 starts hot water circulation (hot water state), the state of the check valve 200 is as follows: Figure 6As shown, hot water flows out from the hot water outlet of the gas water heater 110 and flows to the one-way valve 200 through the hot water pipe 150. At the first fluid inlet 211 of the housing 210, the hot water pushes and opens the valve core 221, that is, under the action of the water flow, the valve core 221 overcomes the elastic force of the first elastic member 224, so that the valve stem 222 moves to the right, thereby driving the gear 242 to rotate, and under the action of the rotating shaft 241, the rotating component 244 rotates counterclockwise, so that under the limit of the rotating bracket 252, the moving component 262 moves in the slide rail 251 under the action of the rotating component 244, thereby driving the blocking component 261 to move and open the second fluid inlet 212. Finally, under the action of the water flow, the blocking component 261 blocks the fluid outlet 213, so that the water flow cannot pass through this channel, so that the water flow can only flow out through the second fluid inlet 212, and flow back to the gas water heater 110 along the cold water pipe 130 to form a circulation loop, until the pipeline of the entire water heater system is full of hot water. Thus, the user can use hot water immediately when opening the water use end 120, realizing the function of zero cold water. The arrowed curve without reference numerals in the figure indicates the direction of water flow.

[0103] When the gas water heater system 100 is not in use for hot water circulation and the cold water outlet of the water-using end 120 is open, in the case where cold water is required to be used alone, the resistance of the hot water pipe (the overall pipeline from the cold water pipe via the gas water heater 110 to the fluid outlet 213) is smaller than the resistance of the cold water pipe (the overall pipeline from the cold water pipe to the fluid outlet 213). At this time, the fluid in the one-way valve 200 enters from the first fluid inlet 211. Since the fluid outlet 213 is open, the water inlet side pressure of the valve core assembly 220 is greater than the water outlet side pressure, causing the valve core 221 to open. The valve core 221 is connected to the linkage assembly 213. 240 drives the blocking component 260 to move toward the direction close to the fluid outlet 213, so that the resistance at the fluid outlet 213 becomes larger, that is, the resistance of the hot water pipe becomes larger, so that more water in the cold water pipe does not pass through the gas water heater 110 but flows into from the second fluid inlet 212 and flows out from the fluid outlet 213, while less water passes through the gas water heater 110 and flows out from the hot water outlet of the gas water heater 110 to the first fluid inlet 211 of the one-way valve 200, and then flows out from the fluid outlet 213, so that the valve core 221 is reset to the valve seat 223 under the action of the first elastic member 224 (such as Figure 7 As shown), the first fluid inlet 211 is closed to prevent the gas water heater 110 from being started by mistake. At this time, all the water flowing out of the cold water outlet of the water end 120 is cold water (cold water state). The arrowed curves without reference numerals in the figure indicate the direction of water flow.

[0104] But not limited to this, it is also possible that after the blocking assembly 260 moves toward the direction close to the fluid outlet 213, a dynamic balance is reached, that is, the valve core 221 is not reset to the valve seat 223, but, as mentioned above, since the water flow through the gas water heater 110 becomes smaller and does not reach the flow rate to start the gas water heater 110, the water flowing out of the hot water outlet of the gas water heater 110 is cold water, and the water entering from the first fluid inlet 211 is also cold water.

[0105] Although the specific embodiments of the present invention are described above, it should be understood by those skilled in the art that this is only for illustration and the protection scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. A one-way valve, characterized in that: It includes: A housing and a valve core assembly, a linkage assembly, a guide assembly and a blocking assembly arranged in the housing; The housing has a first fluid inlet and a fluid outlet; The valve core assembly is used to allow the fluid to flow from the first fluid inlet into the housing in a unidirectional manner; The valve core of the valve core assembly acts on the linkage assembly to drive the blocking assembly to leave or approach the fluid outlet; The guide component is used to limit the moving track of the blocking component; The blocking component is used to reduce the flow area of ​​the fluid flowing out of the fluid outlet when the blocking component is close to the fluid outlet; The linkage assembly includes a rotating shaft, and a gear and a rack meshing with each other, the rack is arranged on a valve stem connected to the valve core, and the gear drives the blocking assembly to move through the rotating shaft; A fixing seat is also provided in the housing, the linkage assembly further includes a rotating component, the rotating shaft is passed through the fixing seat, the gear and the rotating component are respectively located on both sides of the fixing seat and are respectively fixed to both ends of the rotating shaft, and the blocking assembly is linked with the rotating component; The guide assembly includes a slide rail and a rotating bracket, the slide rail and the rotating bracket are both arranged on the fixed seat, the blocking assembly is penetrated on the rotating bracket, and the first end of the blocking assembly is slidably arranged in the slide rail; The housing further has a second fluid inlet. When the valve core assembly cuts off the fluid from flowing into the housing from the first fluid inlet, the blocking assembly is located at the second fluid inlet.

2. The one-way valve according to claim 1, characterized in that: The slide rail comprises a first section, an arc section and a second section connected in sequence, the first section is arranged along the axial direction of the second fluid inlet, and the second section is arranged along the axial direction of the fluid outlet; The rotating component is provided with a moving groove, and the first end of the blocking component is inserted into the moving groove.

3. The one-way valve according to claim 1, characterized in that: The valve core assembly further includes a valve seat and a first elastic member, the valve core abuts against the valve seat to cut off the fluid from flowing from the first fluid inlet into the housing, and the first elastic member biases the valve core in a direction that causes the valve core to approach the valve seat.

4. The one-way valve according to claim 1, characterized in that: The blocking component includes a blocking part, a moving part and a second elastic part. The blocking part is used to reduce the flow area of ​​the fluid flowing out of the fluid outlet when the blocking part is close to the fluid outlet. One end of the moving part is slidably connected to the blocking part, and the other end is linked to the linkage component. The second elastic part biases the blocking part in a direction that makes the blocking part close to the second fluid inlet.

5. The one-way valve according to any one of claims 1 to 4, characterized in that: The shell has an outlet diameter-reducing section, the small end of which faces the fluid outlet, and the blocking component is close to the fluid outlet along the diameter-reducing section to reduce the flow area of ​​the fluid flowing out of the fluid outlet.

6. The one-way valve according to claim 5, characterized in that: The shell comprises a main body, the main body is a sphere, the first fluid inlet and the fluid outlet are both communicated with the main body, and the outlet diameter-reducing section is located between the fluid outlet and the main body.

7. The one-way valve according to claim 1, characterized in that: The one-way valve is used in a gas water heater system, wherein the first fluid inlet is connected to a hot water interface at a water-using end of the gas water heater system, and the fluid outlet is connected to a cold water interface at a water-using end of the gas water heater system.

8. A gas water heater system, characterized in that: It comprises a one-way valve, a gas water heater and a water-using end as claimed in any one of claims 1 to 7; The housing also has a second fluid inlet; The first fluid inlet is connected to the hot water interface of the water-using end of the gas water heater system, the fluid outlet is connected to the cold water interface of the water-using end of the gas water heater system, and the second fluid inlet is connected to the cold water inlet of the gas water heater.

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