Check valve mechanism and gas water heater

Abstract

The utility model provides a one-way valve mechanism and gas water heater, this one-way valve mechanism includes the first valve core of movable setting and the fixed setting fixed part, first valve core and the fixed part set up in the water flow channel between cold water passage and hot water passage, first valve core is along water flow reverse flow direction movement and closes water flow channel when contacting with fixed part, one-way valve mechanism still includes: sealing ring, between first valve core and fixed part, sealing ring sets up in the extension direction of first valve core along water flow normal flow direction movement, the axial direction of sealing ring is consistent with water flow direction, and is located in water flow channel, first valve core is along water flow normal flow direction movement and applies pressure to sealing ring to adjust water flow pressure, spring piece, spring piece provides the pulling force opposite with water flow normal flow direction to first valve core, to make water flow be normal flow direction and water pressure be in standard range, first valve core does not contact sealing ring. The utility model has improved the overall energy efficiency and stability of system.

Description

Technical Field

[0001] This utility model relates to the field of water heater technology, and in particular to a one-way valve mechanism and a gas water heater. Background Technology

[0002] In the water heater industry, achieving "zero cold water" functionality is one of the key technological paths to improving user experience. This functionality relies on installing check valves in the piping system to guide water flow and prevent crosstalk between mixed water circuits. However, the check valves commonly used in the industry today only provide basic one-way shut-off functionality, offering limited performance and failing to effectively stabilize and limit the forward-flowing water. This results in the outlet water pressure being easily affected by fluctuations in inlet water and changes in system operating conditions, leading to problems such as water temperature fluctuations and uneven water flow, directly impacting the user's bathing comfort. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the shortcomings of existing one-way valves, which have a single function and cannot stabilize or limit the flow of water in the forward direction, and to provide a one-way valve mechanism and a gas water heater.

[0004] The present invention solves the above-mentioned technical problems through the following technical solution:

[0005] A one-way valve mechanism includes a movable first valve core and a fixed fixing part. The first valve core and the fixed part are disposed in a water flow channel between a cold water passage and a hot water passage. When the first valve core moves in the reverse direction of the water flow to contact the fixed part, it closes the water flow channel. The one-way valve mechanism further includes:

[0006] A sealing ring is located between the first valve core and the fixed part. The sealing ring is disposed in the extension direction of the first valve core moving along the positive direction of water flow. The axial direction of the sealing ring is consistent with the direction of water flow and is located in the water flow channel. The first valve core moves along the positive direction of water flow and applies pressure to the sealing ring to regulate the water flow pressure.

[0007] A spring element provides a pulling force to the first valve core in the opposite direction to the forward flow of water, so that when the water flow is in the forward direction and the water pressure is within the standard range, the first valve core does not contact the sealing ring.

[0008] In this design, a sealing ring is placed on the side of the first valve core facing the forward flow of water. As the first valve core moves in the forward direction of the water flow, it applies force to the sealing ring to regulate the water pressure. This one-way valve mechanism effectively prevents backflow and allows for stepless pressure regulation during forward flow. The spring element constrains the first valve core when the water pressure is within the standard range, preventing it from moving towards the sealing ring and applying pressure, thus ensuring that the water flow cross-section is not compressed under standard water pressure conditions. This mechanism, through a single mechanical action, simultaneously responds to two key system requirements, achieving adaptive dynamic balance of output pressure. Its highly integrated structural design achieves the goal of low-cost, high-efficiency, and high-reliability fully automatic fluid control, significantly improving the overall energy efficiency and operational stability of the system.

[0009] Preferably, the spring is located between the first valve core and the fixing part, and the elastic direction of the spring is consistent with the axial direction of the sealing ring.

[0010] In this design, by placing a spring between the first valve core and the fixing part, the fixing part provides rigid support for the sealing ring when the first valve core applies pressure to it, effectively limiting its displacement and ensuring the stability of the sealing interface. Based on this, the pressure applied by the first valve core can be precisely converted into axial deformation of the sealing ring, thereby achieving linear and controllable adjustment of the cross-sectional area of ​​the water flow channel. The elastic direction of the spring is set to be consistent with the axial direction of the sealing ring, ensuring that the movement path of the first valve core is always axial. This not only eliminates wear and abnormal losses that may be caused by lateral forces, but also makes the pressure distribution on the sealing ring more uniform, significantly improving the smoothness of the adjustment process and the service life of the core components.

[0011] Preferably, when the first valve core moves in the opposite direction of the water flow, the elastic restoring force of the spring is less than the water flow pressure.

[0012] In this scheme, the first valve core moves in the reverse direction of the water flow. The elastic restoring force of the spring is less than the water flow pressure. The first valve core will move to complete contact with the fixed part and continuously close the water flow channel. In this state, the reverse water pressure and the constraint of the fixed part work together to maintain the stable stop position of the first valve core. This closed state will continue until the water flow resumes the forward flow.

[0013] Preferably, the spring is disposed on the extension direction of the first valve core along the reverse flow direction of the water flow, and the two ends of the spring along the elastic direction are respectively fixed to the fixing part and the first valve core.

[0014] In this solution, by setting the spring element in the extension direction of the first valve core moving in the opposite direction of the water flow, and fixing its two ends to the fixing part and the first valve core respectively, when the water pressure is within the standard range and the water flow is in the forward direction, the pre-tightening force generated by the spring element is opposite to the direction of the water flow force. This force is sufficient to balance the water flow thrust, thereby keeping the water flow channel stably in the open position. At this time, the first valve core does not come into contact with the sealing ring.

[0015] Preferably, the sealing ring is made of an elastic deformable material.

[0016] In this solution, by setting the material of the sealing ring to be an elastic deformable material, the sealing ring can easily deform when the first valve core applies pressure to it, thereby changing the cross-sectional area of ​​the water flow channel.

[0017] Preferably, the sealing ring forms a first channel with the first valve core in the radial direction, and the first valve core applies pressure to the sealing ring and changes the cross-sectional area of ​​the water flow in the first channel.

[0018] In this scheme, the first valve core applies pressure to the sealing ring and changes the cross-sectional area of ​​the water flow in the first channel, thereby increasing the flow velocity of the water flow and releasing the water pressure in the water flow channel. The cross-sectional area of ​​the first channel changes with the cross-sectional area of ​​the sealing ring, which can realize timely response to water flow pressure and achieve rapid and efficient stepless adjustment of water flow pressure.

[0019] Preferably, the fixing part is further provided with a first water outlet, which is located at one end of the fixing part near the hot water passage and connects the water flow channel and the hot water passage. The first valve core moves along the reverse flow direction of the water flow to contact the fixing part and close the first water outlet, so that the water flow channel and the hot water passage are not connected when the water flow is reversed.

[0020] In this design, the first valve core moves in the reverse direction of the water flow to contact the fixed part and close the first outlet that connects the water flow channel and the hot water passage, so that when the water flow is reversed, cold water will not flow into the hot water passage through the water flow channel, thus achieving the effect of reverse cut-off.

[0021] Preferably, the fixing part is further provided with a second water outlet, which is located at one end of the fixing part near the hot water passage and connects the water flow passage and the cold water passage. The end of the first valve core facing the second water outlet is matched with the second water outlet. The first valve core moves along the positive direction of the water flow and changes the cross-sectional area of ​​the water flow at the second water outlet to adjust the water flow pressure.

[0022] In this design, the end of the first valve core facing the second outlet is configured with a specific shape to match the second outlet. When the first valve core moves along the forward flow direction under water pressure, its end extends into or near the second outlet, thereby dynamically adjusting the effective flow area of ​​the outlet. With a relatively constant flow rate, the reduction in flow area directly leads to an increase in the water velocity flowing through the second outlet. This process converts fluid pressure into kinetic energy, effectively releasing pressure within the flow channel and ultimately achieving precise flow control and flow restriction functions.

[0023] Preferably, the inner diameter of the sealing ring is matched with the size of the first valve core to limit the sealing ring.

[0024] In this solution, by setting the inner diameter of the sealing ring and the outer diameter of the first valve core to be precisely matched, the first valve core forms an effective radial constraint on the sealing ring. This structure ensures that the sealing ring is firmly fixed in the installation position and cannot move or rotate under the impact of water flow, thereby avoiding system structural imbalance, failure of flow limiting function, and the resulting increase in maintenance frequency and cost caused by the displacement of the sealing ring.

[0025] A gas water heater includes a one-way valve mechanism as described above. A water flow channel is provided between the cold water passage and the hot water passage of the gas water heater, and the water flow channel connects the cold water passage and the hot water passage. The one-way valve mechanism is disposed in the water flow channel.

[0026] The positive and progressive effects of this utility model are as follows:

[0027] By placing a sealing ring on the side of the first valve core facing the forward flow of water, and enabling the first valve core to apply force to the sealing ring to regulate water pressure when moving in the forward flow direction, this one-way valve mechanism not only effectively prevents backflow of water but also achieves stepless pressure regulation during forward flow. The spring element constrains the first valve core when the water pressure is within the standard range, preventing it from moving towards the sealing ring and applying pressure, thus ensuring that the water flow cross-section is not compressed under standard water pressure conditions. This mechanism, through a single mechanical action, simultaneously responds to two key system requirements, achieving adaptive dynamic balance of output pressure. Its highly integrated structural design achieves the goal of low-cost, high-efficiency, and high-reliability fully automatic fluid control, significantly improving the overall energy efficiency and operational stability of the system. Attached Figure Description

[0028] Figure 1 This is a cross-sectional structural diagram of the one-way valve mechanism, cold water passage, and hot water passage according to a preferred embodiment of the present invention.

[0029] Figure 2This is a cross-sectional structural schematic diagram (I) of a preferred embodiment of the one-way valve mechanism of the present invention.

[0030] Figure 3 This is a cross-sectional structural schematic diagram (II) of a preferred embodiment of the one-way valve mechanism of the present invention.

[0031] Figure 4 This is a cross-sectional structural schematic diagram (III) of a preferred embodiment of the one-way valve mechanism of the present invention.

[0032] Figure 5 This is a partially enlarged schematic diagram of a one-way valve mechanism according to a preferred embodiment of the present invention.

[0033] Explanation of reference numerals in the attached figures

[0034] One-way valve mechanism 001

[0035] First valve core 1

[0036] First Channel 11

[0037] Protruding structure 12

[0038] Fixing part 2

[0039] First outlet 21

[0040] Second outlet 22

[0041] Water flow channel 3

[0042] Sealing ring 4

[0043] Spring component 5

[0044] Cold water passage 6

[0045] Hot water passage 7 Detailed Implementation

[0046] The present invention will be described more clearly and completely below with reference to the accompanying drawings, using a preferred embodiment.

[0047] like Figure 1 As shown, this embodiment provides a one-way valve mechanism 001, which includes a movable first valve core 1 and a fixed part 2. The first valve core 1 and the fixed part 2 are disposed in the water flow channel 3 between the cold water passage 6 and the hot water passage 7. The first valve core 1 moves in the reverse direction of the water flow (e.g., ...). Figure 1 (As indicated by arrow B) When in contact with the fixed part 2, the water flow channel 3 is closed. The one-way valve mechanism 001 also includes:

[0048] The sealing ring 4 is located between the first valve core 1 and the fixing part 2. The sealing ring 4 is disposed on the first valve core 1 along the positive direction of water flow (e.g., Figure 1(As shown by arrow A) In the direction of extension of the movement, the axial direction of the sealing ring 4 is consistent with the direction of water flow and is located in the water flow channel 3. The first valve core 1 moves along the positive direction of water flow and applies pressure to the sealing ring 4 to regulate the water flow pressure.

[0049] Spring 5 provides a pulling force to the first valve core 1 in the opposite direction to the forward flow of water, so that when the water flow is in the forward direction and the water pressure is within the standard range, the first valve core 1 does not contact the sealing ring 4.

[0050] This embodiment features a sealing ring 4 on the side of the first valve core 1 facing the forward flow of water. As the first valve core 1 moves in the forward direction of the water flow, it applies force to the sealing ring 4 to regulate the water pressure. This one-way valve mechanism 001 effectively prevents backflow and enables stepless pressure regulation during forward water flow. The spring 5 constrains the first valve core 1 when the water pressure is within the standard range, preventing it from moving towards the sealing ring 4 and applying pressure, thus ensuring that the water flow cross-section is not compressed under standard water pressure conditions. This mechanism, through a single mechanical action, simultaneously responds to two key system requirements, achieving adaptive dynamic balance of output pressure. Its highly integrated structural design achieves the goal of low-cost, high-efficiency, and high-reliability fully automatic fluid control, significantly improving the overall energy efficiency and operational stability of the system.

[0051] like Figures 1-5 As shown, in this embodiment, the forward water flow is from the hot water passage 7 to the cold water passage 6, and the reverse water flow is from the cold water passage 6 to the hot water passage 7. A spring element 5 is located between the first valve core 1 and the fixing part 2. There is one spring element 5, and it is located in the extending direction of the first valve core 1 along the reverse water flow direction (e.g., ...). Figure 3 As indicated by arrow D, specifically, the spring element 5 is disposed on the side of the first valve core 1 facing the hot water passage 7. The two ends of the spring element 5 along the elastic direction are respectively fixed to the fixing part 2 and the first valve core 1. The elastic direction of the spring element 5 is consistent with the axial direction of the sealing ring 4. The movement direction of the first valve core 1 (as shown by arrow D) Figure 1 (As shown by the middle arrow C) is aligned with the axial direction of the sealing ring 4, and pressure is applied to the sealing ring 4 in the axial direction, so that the cross-section of the sealing ring 4 is aligned in the radial direction (as shown by the middle arrow C). Figure 3 Deformation (as indicated by the middle arrow E), axial diameter (as shown by...) Figure 5 (As shown by arrow I) shrinks, radial diameter (as shown by arrow I) Figure 5 (As indicated by the middle arrow H) increases.

[0052] In this embodiment, the sealing ring 4 is made of an elastic deformable material, specifically rubber, and the axial cross-sectional shape of the sealing ring 4 is circular, as shown below. Figure 5 As shown, when the first valve core 1 applies pressure to the sealing ring 4 along its axial direction, the axial cross-sectional shape of the sealing ring 4 changes to an ellipse with a smaller axial diameter and a larger radial diameter.

[0053] In other embodiments, the number of spring members 5 may be multiple, and the material of the sealing ring 4 may be a material that is easily deformed by pressure, such as polyurethane elastomer or thermoplastic elastomer, which will not be described in detail here.

[0054] like Figures 2-4 As shown, in this embodiment, the sealing ring 4 forms a first channel 11 radially with the first valve core 1. The first valve core 1 applies pressure to the sealing ring 4 and changes the cross-sectional area of ​​the water flow in the first channel 11. When the sealing ring 4 is in the axial direction (e.g. Figure 3 As indicated by arrow D, when subjected to pressure from the first valve core 1, the cross-section of the sealing ring 4 changes. The radial diameter of the sealing ring 4 increases, and the distance from the inner surface of the sealing ring 4 to the first valve core 1 decreases in the radial direction. That is, the cross-sectional area of ​​the first channel 11 decreases, the water flow area decreases, and the flow velocity increases. By driving the first valve core 1 to squeeze and deform the sealing ring 4, the cross-sectional area of ​​the water flow in the first channel 11 is dynamically and continuously changed. When the channel area decreases, the water flow velocity is increased, thereby effectively releasing the water pressure in the channel. This achieves rapid response to system pressure and efficient, smooth, stepless regulation.

[0055] In addition, such as Figures 2-4 As shown, a second water outlet 22 is also provided on the fixing part 2. The second water outlet 22 is located at one end of the fixing part 2 near the hot water passage 7 and connects the water flow passage 3 and the cold water passage 6. The end of the first valve core 1 facing the second water outlet 22 is matched with the second water outlet 22. The first valve core 1 moves along the positive direction of water flow and changes the cross-sectional area of ​​the water flow at the second water outlet 22 to adjust the water flow pressure. Specifically, the end of the first valve core 1 facing the second water outlet 22 is provided with a protruding structure 12 protruding towards the second water outlet 22. The side of the protruding structure 12 facing the hot water passage 7 accommodates... The spring element 5 is connected to one end in the elastic direction of the spring element 5. The size of the protruding structure 12 matches that of the second outlet 22. The maximum outer diameter of the protruding structure 12 is smaller than the cross-sectional size of the second outlet 22. The outer diameter of the protruding structure 12 gradually shrinks along the direction close to the second outlet 22, so that the cross-sectional size of the water flow between the protruding structure 12 and the second outlet 22 gradually expands along the direction close to the cold water passage 6. This horn-shaped channel structure can guide the water flow to be discharged quickly from the water flow channel 3, improving the efficiency of pressure relief, slow flow and flow stabilization.

[0056] In other embodiments, the protruding structure 12 may not be provided on the first valve core 1, and a corresponding wedge structure may be provided on the second outlet 22 to cooperate with the first valve core 1 so that when the first valve core 1 moves toward the second outlet 22 and engages with it, the water flow area between the first valve core 1 and the second outlet 22 is reduced, which will not be elaborated here.

[0057] In addition, such as Figures 1-4 As shown, in this embodiment, the inner diameter of the sealing ring 4 is matched with the size of the first valve core 1 to limit the sealing ring 4. The inner diameter of the sealing ring 4 matches the outer diameter of the protruding structure 12. The outer diameter of the protruding structure 12 is slightly smaller than the inner diameter of the sealing ring 4, so that when the axial direction of the sealing ring 4 is consistent with the water flow direction, it can be locked in the water flow channel 3 between the first valve core 1 and the fixing part 2, and cooperate with the first valve core 1 to adjust the cross-sectional area of ​​the first channel 11. The sealing ring 4 and the first valve core 1 adopt a precision fit design to form a radial constraint, ensuring that it is fixed in the installation position and will not be displaced or rotated due to water flow impact. This effectively prevents problems such as system imbalance, reduced flow limiting function and increased maintenance costs caused by the movement of the sealing ring 4.

[0058] In other embodiments, a limiting structure for the sealing ring 4 may also be provided on the fixing part 2 or the first valve core 1 to ensure that the sealing ring 4 will not be displaced under working conditions due to water pressure and gravity, which will not be elaborated here.

[0059] like Figure 2 As shown, in this embodiment, when the water flow is in the forward direction and the water pressure is within the standard range, the water pressure is less than or equal to the elastic restoring force of the spring member 5. The tension provided by the spring member 5 to the first valve core 1 in the opposite direction to the forward flow of the water is greater than the pressure of the water flow. At this time, under the control of the spring member 5, the first valve core 1 does not contact the sealing ring 4, the sealing ring 4 does not deform, the cross-sectional area of ​​the water flow between the first channel 11 and the protruding structure 12 and the second outlet 22 is not compressed, the water flow velocity is relatively slow, and the water pressure is not reduced.

[0060] like Figure 3As shown, in this embodiment, when the water flow is in the forward direction but the water pressure exceeds the standard range, the water pressure is greater than the elastic restoring force of the spring 5. The tension provided by the spring 5 to the first valve core 1, which is opposite to the forward flow direction of the water, is less than the water pressure. At this time, the first valve core 1, driven by the water flow, contacts the sealing ring 4 and applies pressure to it. The sealing ring 4 is sandwiched between the fixing part 2 and the first valve core 1. The fixing part 2 and the first valve core 1 apply forces of the same magnitude but opposite directions to the sealing ring 4. The sealing ring 4 deforms, being compressed in the axial direction and stretched in the radial direction. The radial cross-sectional diameter increases, compressing the first valve core 1. When the cross-sectional dimensions of channel 11 are adjusted and the first valve core 1 moves toward the second outlet 22, the protruding structure 12 approaches the second outlet 22. The volume of the part where the protruding structure 12 and the second outlet 22 interlock increases, compressing the water flow area. The cross-sectional area of ​​the water flow between the first channel 11 and the protruding structure 12 and the second outlet 22 is compressed, and the water flow velocity increases. Under the condition of relatively constant flow rate, the reduction of the flow area will directly lead to an increase in the water flow velocity through the second outlet 22. At this time, the fluid pressure is converted into kinetic energy, thereby effectively releasing the pressure in the flow channel and ultimately achieving precise flow control and flow restriction functions.

[0061] like Figure 4 As shown, in this embodiment, when the first valve core 1 moves in the reverse direction of the water flow, the elastic restoring force of the spring 5 is less than the water flow pressure. At this time, the elastic restoring force of the spring is the force after compression that is consistent with the forward direction of the water flow. The fixing part 2 is also provided with a first water outlet 21. The first water outlet 21 is located at one end of the fixing part 2 near the hot water passage 7 and connects the water flow passage 3 and the hot water passage 7. The first valve core 1 moves in the reverse direction of the water flow until it contacts the fixing part 2 and closes the first water outlet 21, so that the water flow passage 3 and the hot water passage 7 are not connected when the water flow is reversed. When the first valve core 1 moves in the reverse direction of the water flow, the water flow pushes the first valve core 1 to contact the fixing part 2. The side of the first valve core 1 facing the first outlet 21 comes into contact with the first outlet 21 and blocks the first outlet 21, so that the cold water in the cold water passage 6 will not flow into the hot water passage 7. In this state, the reverse water pressure and the constraint of the fixing part 2 work together to maintain the stable stop position of the first valve core 1. This closed state will continue until the water flow resumes the forward flow.

[0062] This embodiment also provides a gas water heater, which includes the one-way valve mechanism 001 as described above. A water flow channel 3 is provided between the cold water passage 6 and the hot water passage 7 of the gas water heater. The water flow channel 3 connects the cold water passage 6 and the hot water passage 7. The one-way valve mechanism 001 is disposed in the water flow channel 3.

[0063] This gas water heater can be controlled by a voice module, which is equipped with a controller, a voice receiving module, and a voice parsing module. The voice receiving module receives user commands, and the voice parsing module parses the commands. Based on the parsed commands, the controller controls the gas water heater to perform corresponding operations, thereby realizing intelligent control of the gas water heater and improving the user experience.

[0064] While specific embodiments of this utility model have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of this utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this utility model, but all such changes and modifications fall within the scope of protection of this utility model.

Claims

1. A one-way valve mechanism, comprising a movably disposed first valve core and a fixedly disposed fixing part, the first valve core and the fixing part being disposed in a water flow channel between a cold water passage and a hot water passage, wherein the first valve core, when moving in the reverse direction of the water flow to contact the fixing part, closes the water flow channel, characterized in that, The one-way valve mechanism also includes: A sealing ring is located between the first valve core and the fixed part. The sealing ring is disposed in the extension direction of the first valve core moving along the positive direction of water flow. The axial direction of the sealing ring is consistent with the direction of water flow and is located in the water flow channel. The first valve core moves along the positive direction of water flow and applies pressure to the sealing ring to regulate the water flow pressure. A spring element provides a pulling force to the first valve core in the opposite direction to the forward flow of water, so that when the water flow is in the forward direction and the water pressure is within the standard range, the first valve core does not contact the sealing ring.

2. The one-way valve mechanism as described in claim 1, characterized in that, The spring is located between the first valve core and the fixing part, and the elastic direction of the spring is consistent with the axial direction of the sealing ring.

3. The one-way valve mechanism as described in claim 2, characterized in that, When the first valve core moves in the opposite direction of the water flow, the elastic restoring force of the spring is less than the water flow pressure.

4. The one-way valve mechanism as described in claim 2, characterized in that, The spring element is disposed on the extension direction of the first valve core along the reverse flow direction of the water flow, and the two ends of the spring element along the elastic direction are respectively fixed to the fixing part and the first valve core.

5. The one-way valve mechanism as described in claim 1, characterized in that, The sealing ring is made of an elastic deformable material.

6. The one-way valve mechanism as described in claim 1, characterized in that, The sealing ring forms a first channel with the first valve core in the radial direction. The first valve core applies pressure to the sealing ring and changes the cross-sectional area of ​​the water flow in the first channel.

7. The one-way valve mechanism as described in claim 1, characterized in that, The fixing part is also provided with a first water outlet. The first water outlet is located at one end of the fixing part near the hot water passage and connects the water flow channel and the hot water passage. The first valve core moves along the reverse flow direction of the water flow to contact the fixing part and close the first water outlet, so that the water flow channel and the hot water passage are not connected when the water flow is reversed.

8. The one-way valve mechanism as described in claim 1, characterized in that, The fixing part is also provided with a second water outlet. The second water outlet is located at one end of the fixing part near the hot water passage and connects the water flow passage and the cold water passage. The end of the first valve core facing the second water outlet is matched with the second water outlet. The first valve core moves along the positive direction of the water flow and changes the cross-sectional area of ​​the water flow of the second water outlet to adjust the water flow pressure.

9. The one-way valve mechanism as described in claim 1, characterized in that, The inner diameter of the sealing ring is matched with the size of the first valve core to limit the sealing ring.

10. A gas water heater, characterized in that, The gas water heater includes a one-way valve mechanism as described in any one of claims 1-9, wherein a water flow channel is provided between the cold water passage and the hot water passage of the gas water heater, the water flow channel connecting the cold water passage and the hot water passage, and the one-way valve mechanism is disposed in the water flow channel.

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