Constant-temperature memory alloy one-way valve and water-using waterway of gas water heater

Abstract

The utility model provides a constant temperature memory alloy one-way valve and a water waterway of a gas water heater, the constant temperature memory alloy one-way valve comprises a valve body, the valve body comprises a cold water inlet, a cold water outlet, a hot water inlet and a hot water outlet, and the cold water inlet and the cold water outlet are communicated with the hot water inlet and the hot water outlet through a communication cavity. The valve further comprises a valve seat, a valve element and a first elastic piece, the valve seat is formed in the communicating cavity, the valve element is arranged on the valve seat, and the valve element can be driven by water pressure to open the communicating cavity and compress the first elastic piece. The first elastic piece is made of constant-temperature memory alloy so that the first elastic piece can be stretched when water in the communication cavity is heated to the preset temperature. The elastic force of the first elastic piece is enhanced after the first elastic piece is pulled up, pressure applied to the one-way valve by increased water pressure under pressurization can be resisted, the opening degree of the one-way valve is reduced, and the flow of hot water entering a heat circulation pipeline is not reduced or reduced. Energy waste is reduced, and the hot water using experience of a user is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of gas water heater, especially one-way valve of constant temperature memory alloy and water route of gas water heater. BACKGROUND

[0002] With the pursuit of people's life quality unceasingly improves, the zero cold water and pressure increasing function of gas water heater have been favored by more and more users. However, in practical application, many users' homes have not pre-installed hot water return pipeline, and the late installation of hot water return pipeline not only is complex in engineering, but also is relatively high in cost. At this time, the one-way valve becomes an ideal solution. In the farthest water end, the one-way valve is connected between the hot water pipe and the cold water pipe, when the zero cold water function of the gas water heater is started, the one-way valve can form a complete circulation loop with the pipeline and the water heater, thereby heating the water in the pipe. In this way, when the user opens the hot water faucet, hot water can be enjoyed immediately, greatly improving the convenience of water use.

[0003] Although the one-way valve plays an important role in the zero cold water function, when the pressure increasing function is started, the water pump is started, the pressure in the pipeline is increased, and the water pressure increase may open the one-way valve. At this time, in addition to the normal hot water flow from the hot water faucet, a part of the hot water heated by the gas water heater will flow through the opened one-way valve to the circulation pipeline, causing unnecessary flow in the circulation pipeline. This not only makes the water heater do a lot of useless work, wastes energy, but also reduces the actual water flow obtained by the user, seriously affecting the use effect and user experience of the pressure increasing function. UTILITARIAN CONTENT

[0004] The utility model solves the technical problem that the one-way valve is opened when the pressure increasing function is started, the water pump is started, the pressure in the pipeline is increased, the water pressure increase may open the one-way valve, causing energy waste and affecting user experience in the prior art, and provides a constant temperature memory alloy one-way valve and water route of gas water heater.

[0005] The utility model solves the above technical problem by the following technical scheme:

[0006] A constant temperature memory alloy one-way valve, the one-way valve includes a valve body, the valve body includes a cold water inlet, a cold water outlet, a hot water inlet and a hot water outlet, the cold water inlet and the cold water outlet are communicated through a communication cavity and the hot water inlet and the hot water outlet, it also includes a valve seat, a valve core and a first elastic piece, the valve seat is formed in the communication cavity, the valve core is arranged on the valve seat, and the valve core can open the communication cavity and compress the first elastic piece under the drive of water pressure;

[0007] The first elastic member is made of a constant temperature memory alloy so that it is stretched when water in the communication cavity is heated to a preset temperature.

[0008] In the present scheme, the constant temperature memory alloy one-way valve includes a first elastic member made of constant temperature memory alloy as its reset member, which can stretch when the internal water flow reaches its phase transition temperature, causing its elasticity to change. When hot water is used in a pressurized state, the temperature of the hot water will heat the first elastic member to its phase transition temperature, causing it to stretch. After stretching, the first elastic member has increased elasticity, which can resist the increased water pressure exerted on the one-way valve under pressure, so that the one-way valve will not be opened or the degree of opening will be reduced, and hot water will not enter or the flow into the hot water circulation pipeline will be reduced. Reducing energy waste and improving user experience of using hot water.

[0009] Preferably, the valve seat is formed on the peripheral wall of the communication cavity, and the valve seat has a through hole in the middle, and the valve core passes through the through hole and can reciprocate in the direction of water flow.

[0010] The valve core includes a sealing portion and a valve stem, the sealing portion is arranged at one end of the valve stem, and the first elastic member is sleeved on the valve stem, one end of the first elastic member abuts against the sealing portion and the other end abuts against the valve seat when the first elastic member is compressed.

[0011] In the present scheme, the first elastic member is sleeved on the valve stem, which can make the compression direction of the first elastic member consistent with the extension direction of the valve stem, facilitating the compression of the first elastic member by the valve core under water pressure and the action of the sealing portion when the first elastic member is reset.

[0012] Preferably, the constant temperature memory alloy one-way valve further includes a second elastic member, the second elastic member is arranged between the valve core and the valve seat, the valve core can open the communication cavity and compress the second elastic member under the drive of water pressure, and the second elastic member is made of a material other than constant temperature memory alloy.

[0013] The first elastic member has a gap with the sealing portion when it is relaxed.

[0014] In the present scheme, the one-way valve is provided with a second elastic member, which is a conventional spring, and the first elastic member is not in contact with the valve core in a relaxed state. When the water pump is in an unstarted state, i.e. in a non-pressurized state and the user normally uses hot water or hot water circulates, the memory alloy spring of the first elastic member is in a free state and is not subjected to any compression force. At this time, the valve core is driven by the conventional spring of the second elastic member to the limit position, so that the valve is completely closed. This arrangement can prevent the memory alloy spring from acting on the valve core in the low pressure and hot water circulation modes, thereby reducing the opening resistance of the one-way valve to avoid flow reduction.

[0015] The conventional spring is located at the bottom of the valve core, most of its structure is surrounded inside, and its diameter is much smaller than that of the memory alloy spring. Such a design layout aims to prevent the conventional spring from being intertwined with the memory alloy spring and interfering with each other, and to ensure that the two can independently and normally play their functions.

[0016] In the scenario of using cold water, the valve also needs to be kept closed. The key role of doing so is to prevent cold water from entering the hot water pipeline through the valve, thereby avoiding the mixing of cold and hot water, ensuring that users can obtain accurate and pure cold water in temperature, and guaranteeing the normal operation of the water system and the water experience of users.

[0017] Preferably, the radial dimensions of the second elastic member and the first elastic member are different.

[0018] In this scheme, the second elastic member of the conventional spring has a diameter much smaller than the first elastic member of the memory alloy spring by adopting the above structure. Such a design layout aims to prevent the conventional spring from being intertwined with the memory alloy spring and interfering with each other, and to ensure that the two can independently and normally play their functions.

[0019] Preferably, the valve seat further comprises a spacer sleeve, the spacer sleeve defines the through hole, and the valve rod passes through the spacer sleeve.

[0020] The first elastic member and the second elastic member are respectively located on the inner and outer sides of the spacer sleeve.

[0021] In this scheme, the second elastic member of the conventional spring is located at the bottom of the valve core, most of its structure is surrounded inside, further avoiding the conventional spring from being intertwined with the memory alloy spring and interfering with each other, and ensuring that the two can independently and normally play their functions.

[0022] Preferably, the valve rod comprises a wide part and a narrow part with different radial dimensions along its length direction, and the narrow part and the sealing part are respectively arranged on both sides of the wide part.

[0023] The first elastic member and the second elastic member are respectively sleeved on one of the wide part or the narrow part and can abut against one of the sealing part or the end face of the wide part.

[0024] In this scheme, the stepped structure of the valve rod facilitates the arrangement of the two springs by adopting the above structure.

[0025] Preferably, the thermostatic memory alloy one-way valve comprises a plurality of the first elastic members.

[0026] In this scheme, a plurality of thermostatic memory alloy springs are adopted in order to obtain higher spring force under the same temperature change by adopting the above structure.

[0027] Preferably, the sizes of the plurality of first elastic members are different.

[0028] In this scheme, the above structure is adopted, so that the plurality of first elastic members do not interfere with each other, facilitating arrangement.

[0029] Preferably, the phase transition temperatures of the materials of the first elastic members are different.

[0030] In this scheme, the above structure is adopted, and the memory alloy springs with different phase transition temperatures can accurately adjust the opening resistance of the valve core according to the actual temperature of the water flow. This means that the valve can automatically adjust the flow of hot and cold water according to different temperature conditions, thereby achieving more accurate temperature control. For example, when the water flow temperature rises, the spring with a lower phase transition temperature will generate a restoring force first, pushing the valve core to close and reducing the hot water flow; when the temperature decreases, the spring with a higher phase transition temperature will maintain or increase the opening resistance, ensuring sufficient hot water flow and maintaining the stability of the outlet water temperature.

[0031] A water use waterway of a gas water heater for connecting the gas water heater and a plurality of water use ends, comprising the thermostatic memory alloy check valve as described above, which is arranged at the water use end farthest from the waterway.

[0032] In this scheme, the above structure is adopted, and the thermostatic memory alloy check valve includes a first elastic member made of thermostatic memory alloy as its reset member. This reset member can stretch when the internal water flow reaches its phase transition temperature, causing a change in its elasticity. When hot water is used in a pressurized state, the temperature of the hot water will heat the first elastic member to its phase transition temperature, causing it to stretch. After stretching, the first elastic member has increased elasticity, which can resist the pressure exerted on the check valve by the increased water pressure under pressure, so that the check valve will not be opened or the degree of opening will be reduced, and the hot water will not enter or the flow into the hot circulation pipeline will be reduced. This reduces energy waste and improves the user's experience of using hot water.

[0033] At the same time, the check valve is installed at the farthest water use end, which can accurately sense when hot water reaches this position (i.e., the farthest end of hot water), and cooperate with software to achieve accurate zero-cold-water half-pipe circulation. Traditional half-pipe circulation usually relies on software to operate according to the estimated circulation time, which is not accurate enough. The design of this patent does not reduce the circulation flow during normal circulation, which is in contrast to the need for a large valve resistance to weaken the shunt under pressure. In the pressurized state, in order to weaken the shunt, the valve needs a larger resistance, but this will cause the circulation flow to decrease, and even possibly decrease to below the minimum flow of the pump circulation, making the circulation unable to proceed normally. Therefore, increasing the domestic water flow and circulation flow during pressurization is usually contradictory for the valve. However, this scheme ingeniously solves this problem, achieving a balance between the two.

[0034] The positive progress effect of the utility model lies in: the constant temperature memory alloy check valve comprises a first elastic piece made of constant temperature memory alloy as its reset piece, and the reset piece can stretch and change its elasticity when the internal water flow reaches its phase change temperature.

[0035] Meanwhile, the check valve is installed at the farthest water end, can accurately perceive that hot water reaches the position (i.e. the farthest end of hot water), and realizes accurate zero cold water half pipe circulation in cooperation with software. The traditional half pipe circulation usually relies on software to operate according to the estimated circulation time, and this method is not accurate enough. The design of the patent does not reduce the circulation flow in normal circulation, which is in contrast with the requirement of large valve resistance for pressure increase and pressure reduction. In the state of pressure increase, in order to reduce the shunt, the valve needs large resistance, but this will lead to the decrease of circulation flow, and even the circulation flow may be reduced to below the minimum flow of pump circulation, so that the circulation cannot be normally carried out. Therefore, increasing the domestic water flow and the circulation flow in the state of pressure increase is usually contradictory to the valve. However, the scheme ingeniously solves the problem and realizes the balance between the two. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 It is a structure schematic view of the constant temperature memory alloy check valve of the utility model embodiment.

[0037] Figure 2 It is a structure schematic view of the valve assembly of the utility model embodiment.

[0038] Figure 3 It is an explosion structure schematic view of the valve assembly of the utility model embodiment.

[0039] Figure 4 It is a structure schematic view of the constant temperature memory alloy check valve in the first pressure increase state of the utility model embodiment.

[0040] Figure 5 It is a structure schematic view of the constant temperature memory alloy check valve in the second pressure increase state of the utility model embodiment.

[0041] Figure 6 It is a structure schematic view of the constant temperature memory alloy check valve in the first circulation state of the utility model embodiment.

[0042] Figure 7 It is a structure schematic view of the constant temperature memory alloy check valve in the second circulation state of the utility model embodiment.

[0043] Explanation of reference numerals in the attached figures:

[0044] One-way valve 1

[0045] Valve seat 11

[0046] Tongkou 111

[0047] Spacer 112

[0048] Valve core 12

[0049] Sealing part 121

[0050] Valve stem 122

[0051] Width 1221

[0052] Narrow section 1222

[0053] First elastic element 13

[0054] Gap 131

[0055] Second elastic element 14

[0056] Valve body 2

[0057] Cold water inlet 24

[0058] Cold water outlet 23

[0059] Hot water inlet 21

[0060] Hot water outlet 22

[0061] Connecting cavity 25 Detailed Implementation

[0062] The present invention will be described more clearly and completely below with reference to the accompanying drawings, using a preferred embodiment.

[0063] like Figure 1 As shown, this embodiment provides a thermostatic memory alloy one-way valve 1. The one-way valve 1 includes a valve body 2, which includes a cold water inlet 24, a cold water outlet 23, a hot water inlet 21, and a hot water outlet 22. The cold water inlet 24 and the cold water outlet 23 are connected to the hot water inlet 21 and the hot water outlet 22 through a connecting cavity 25. It also includes a valve assembly, which consists of a valve seat 11, a valve core 12, and a first elastic element 13. The valve seat 11 is formed in the connecting cavity 25, and the valve core 12 is disposed on the valve seat 11. The valve core 12 can open the connecting cavity 25 and compress the first elastic element 13 under water pressure. The first elastic element 13 is made of thermostatic memory alloy so that it stretches when the water in the connecting cavity 25 is heated to a preset temperature.

[0064] The thermostatic memory alloy one-way valve 1 has four ports, among which the cold water inlet 24 and the cold water outlet 23 are located on the left side, and the hot water inlet 21 and the hot water outlet 22 are located on the right side. The left side and the right side are communicated through the communication cavity 25, and the valve assembly is arranged in the communication cavity 25 to be able to close the left and right sides or be communicated.

[0065] When hot water is used, the one-way valve 1 is closed, the water flow enters the valve body 2 from the hot water inlet 21 and flows out through the hot water outlet 22. When the heat cycle is performed, the one-way valve 1 is opened, the water flow enters the valve body 2 from the hot water inlet 21 and returns to the gas water heater to be heated again.

[0066] The thermostatic memory alloy one-way valve 1 includes a first elastic member 13 made of a thermostatic memory alloy as a reset member. The reset member can stretch when the internal water flow reaches the phase change temperature, so that the elasticity changes. When hot water is used in a pressurized state, the temperature of the hot water will heat the first elastic member 13 to reach the phase change temperature to produce stretching. After the first elastic member 13 is stretched, the elastic force is enhanced, which can resist the pressure exerted on the one-way valve 1 by the increased water pressure under the pressurization, so that the one-way valve 1 is not opened or the degree of opening is reduced, and the hot water cannot enter or the flow into the heat cycle pipeline is reduced. Reduce energy waste and improve user experience of using hot water.

[0067] The thermostatic memory alloy one-way valve 1 in the pressurized state is shown in Figure 4 , Figure 5 . Figure 4 It is the first pressurized state, at this time the user has just started to use hot water, the pressurization function is opened, the water pump is started, and the water pressure in the valve body 2 is increased and the valve core 12 is moved to the right under the influence of factors such as the size of the water pump force and the size of the household water pressure. The one-way valve 1 is opened to different degrees. At this time, part of the hot water flow that should flow out through the hot water outlet 22 enters the cold water inlet 24 through the opened one-way valve 1 and then returns to the water heater. This results in a decrease in the amount of hot water used by the user and does useless work. After the first pressurized state, the water gradually heats up to the phase change temperature of the memory alloy spring, and the memory alloy spring of the first elastic member 13 begins to deform and stretch into the second pressurized state. At this time, as shown in Figure 5 , the force of the first elastic member 13 against the water pump increases, the valve core 12 moves to the left, and the cross-sectional area of the water flow decreases. The shunt water flow decreases, and the water flow to the hot water faucet increases.

[0068] In addition, the thermostatic memory alloy one-way valve 1 in the circulation state is shown in Figure 6 , Figure 7 . Figure 6For the first circulation state, the zero-cold-water circulation function is turned on, the pump is started, and the valve core 12 moves to the right. In the first circulation state, the circulating water is continuously heated, and the water at the farthest end of the one-way valve 1 gradually rises to the phase transition temperature of the memory alloy. At this time, the first elastic member 13 is deformed and elongated, and enters the second circulation state, as shown in Figure 7 The circulation flow is reduced, and the heating power of the water heater can also be adaptively reduced to achieve the purpose of energy saving.

[0069] As shown in Figures 1 to 3 The valve seat 11 is formed on the peripheral wall of the communication cavity 25, and has a through hole 111 in the middle. The valve core 12 includes a sealing portion 121 and a valve rod 122. The sealing portion 121 is arranged at one end of the valve rod 122. The first elastic member 13 is sleeved on the valve rod 122, and one end of the first elastic member 13 abuts against the sealing portion 121 and the other end abuts against the valve seat 11 when the first elastic member 13 is compressed.

[0070] The first elastic member 13 is sleeved on the valve rod 122, so that the compression direction of the first elastic member 13 is consistent with the extension direction of the valve rod 122. When the first elastic member 13 is compressed and reset under the water pressure, the sealing portion 121 can be acted on.

[0071] As shown in Figures 1 to 3 The constant-temperature memory alloy one-way valve 1 further includes a second elastic member 14 arranged between the valve core 12 and the valve seat 11. The valve core 12 can open the communication cavity 25 and compress the second elastic member 14 under the driving of the water pressure. The second elastic member 14 is made of a material other than the constant-temperature memory alloy.

[0072] When the first elastic member 13 is relaxed, there is a gap 131 between the first elastic member 13 and the sealing portion 121.

[0073] The one-way valve 1 is provided with the second elastic member 14, which is a conventional spring. When the water pump is in a non-starting state, i.e., a non-pressurizing state, and the user normally uses hot water or the hot water is circulated, the memory alloy spring of the first elastic member 13 is in a free state and is not subjected to any compression force. At this time, the valve core 12 is driven by the conventional spring of the second elastic member 14 to the limit position, so that the valve is completely closed. This arrangement can prevent the memory alloy spring from acting on the valve core 12 in the low-pressure and hot water circulation modes, thereby reducing the opening resistance of the one-way valve 1 to avoid the decrease in flow.

[0074] The conventional spring is located at the bottom of the valve core 12, most of its structure is surrounded inside, and the diameter is much smaller than that of the memory alloy spring. Such a design layout is intended to prevent the conventional spring and the memory alloy spring from being intertwined and interfering with each other, and to ensure that the two can independently and normally perform their functions.

[0075] In the scenario of using cold water, the valve also needs to be kept closed. The key role of doing so is to prevent cold water from entering the hot water pipeline through the valve, thereby avoiding the mixing of cold and hot water, ensuring that users can obtain accurate and pure cold water temperature, and ensuring the normal operation of the water system and the user's water experience.

[0076] As shown in Figure 3 , the radial dimensions of the second elastic member 14 and the first elastic member 13 are different.

[0077] The diameter of the second elastic member 14 of the conventional spring is much smaller than that of the first elastic member 13 of the memory alloy spring. Such a design layout aims to prevent the conventional spring and the memory alloy spring from interfering with each other and ensure that both can independently and normally perform their functions.

[0078] As shown in Figure 2 , the valve seat 11 also includes a spacer sleeve 112, which defines a through hole 111, and the valve rod 122 passes through the spacer sleeve 112.

[0079] The first elastic member 13 and the second elastic member 14 are respectively located on the inner and outer sides of the spacer sleeve 112.

[0080] The second elastic member 14 of the conventional spring is located at the bottom of the valve core 12, and most of its structure is enclosed inside, further avoiding the mutual interference between the conventional spring and the memory alloy spring, and ensuring that both can independently and normally perform their functions.

[0081] As shown in Figure 3 , the valve rod 122 includes a wide part 1221 and a narrow part 1222 with different radial dimensions along its length direction, and the narrow part 1222 and the sealing part 121 are respectively arranged on both sides of the wide part 1221.

[0082] The first elastic member 13 and the second elastic member 14 are respectively sleeved on one of the wide part 1221 or the narrow part 1222 and can abut against one of the end faces of the sealing part 121 or the wide part 1221.

[0083] The stepped structure of the valve rod 122 facilitates the arrangement of the two springs.

[0084] As shown in Figure 2 , 3 , the thermostatic memory alloy check valve 1 includes a plurality of first elastic members 13.

[0085] A plurality of thermostatic memory alloy springs are used to obtain higher spring force under the same temperature change.

[0086] As shown in Figure 3 , the sizes of the plurality of first elastic members 13 are different. This allows the plurality of first elastic members 13 to not interfere with each other and facilitates arrangement.

[0087] In this embodiment, the phase transition temperatures of the materials of the first elastic members 13 are different. Memory alloy springs with different phase transition temperatures can accurately adjust the opening resistance of the valve core 12 according to the actual temperature of the water flow. This means that the valve can automatically adjust the flow of hot and cold water according to different temperature conditions, thereby achieving more accurate temperature control. For example, when the water flow temperature rises, the spring with a lower phase transition temperature will generate a restoring force first, pushing the valve core 12 to close and reducing the hot water flow; when the temperature decreases, the spring with a higher phase transition temperature will maintain or increase the opening resistance, ensuring sufficient hot water flow and maintaining the stability of the outlet water temperature.

[0088] The embodiment also provides a water use waterway of a gas water heater, which is used to connect the gas water heater and a plurality of water use ends, and includes the thermostatic memory alloy check valve 1 as described above, which is arranged at the water use end farthest from the gas water heater. The thermostatic memory alloy check valve 1 includes the first elastic member 13 made of thermostatic memory alloy as its restoring member, which can stretch and change its elasticity when the internal water flow reaches its phase transition temperature. When hot water is used in a pressurized state, the temperature of the hot water will heat the first elastic member 13 to its phase transition temperature to generate stretching, and the first elastic member 13 will have enhanced elasticity after stretching, which can resist the pressure exerted on the check valve 1 by the increased water pressure under pressurization, so that the check valve 1 will not be opened or the degree of opening will be reduced, and the hot water will not enter or the flow entering the hot cycle pipeline will be reduced. This reduces energy waste and improves the user's experience of using hot water.

[0089] At the same time, the check valve 1 is installed at the farthest water use end, which can accurately sense that the hot water has reached this position (i.e., the farthest end of the hot water), and cooperate with the software to achieve accurate zero-cold-water half-pipe circulation. Traditional half-pipe circulation usually relies on software to operate according to the estimated circulation time, which is not accurate enough. The design of the present patent does not reduce the circulation flow during normal circulation, which is in contrast to the need for large valve resistance to weaken the shunt under pressurization. In the pressurized state, in order to weaken the shunt, the valve needs a large resistance, but this will cause the circulation flow to decrease, and even possibly decrease to below the minimum flow of the pump circulation, making the circulation unable to proceed normally. Therefore, increasing the domestic water flow and the circulation flow during pressurization is usually contradictory for the valve. However, the present scheme ingeniously solves this problem and achieves a balance between the two.

Claims

1. A thermostatic memory alloy check valve, the check valve comprising a valve body, the valve body comprising a cold water inlet, a cold water outlet, a hot water inlet and a hot water outlet, the cold water inlet and the cold water outlet being in communication with the hot water inlet and the hot water outlet by a communication cavity, characterized in that, The valve seat is formed on the circumferential wall of the communicating cavity, and the valve core passes through the through hole in the valve seat and can reciprocate in the direction of water flow. The valve core comprises a sealing part and a valve rod, the sealing part is arranged at one end of the valve rod, and the first elastic member is sleeved on the valve rod.

2. The constant temperature memory alloy check valve of claim 1, wherein, The temperature memory alloy one-way valve further comprises a second elastic member arranged between the valve core and the valve seat. The first elastic member has a gap with the sealing part when relaxed.

3. The constant temperature memory alloy check valve of claim 2, wherein, The radial dimensions of the second elastic member and the first elastic member are different. The valve seat further comprises a spacer sleeve, the spacer sleeve defines the through hole, and the valve rod passes through the spacer sleeve.

4. The constant temperature memory alloy check valve of claim 3, wherein, The first elastic member and the second elastic member are respectively located on the inner and outer sides of the spacer sleeve.

5. The constant temperature memory alloy check valve of claim 4, wherein, The valve rod comprises a wide part and a narrow part with different radial dimensions along the length direction of the valve rod. The first elastic member and the second elastic member are respectively sleeved on one of the wide part or the narrow part and can abut against one of the sealing part or the end face of the wide part.

6. The constant temperature memory alloy check valve of claim 4, wherein, The temperature memory alloy one-way valve comprises a plurality of first elastic members. The sizes of the plurality of first elastic members are different.

7. The constant temperature memory alloy check valve of claim 1, wherein, The phase transition temperatures of the materials of the plurality of first elastic members are different.

8. The constant temperature memory alloy check valve of claim 7, wherein, The temperature memory alloy one-way valve comprises a plurality of first elastic members.

9. The constant temperature memory alloy check valve of claim 7, wherein, The sizes of the plurality of first elastic members are different.

10. A waterway of a gas water heater for connecting the gas water heater and a plurality of water using ends, characterized in that, The phase transition temperatures of the materials of the plurality of first elastic members are different. The temperature memory alloy one-way valve comprises a plurality of first elastic members.

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