Cold and hot water valve and water supply system

Abstract

The utility model relates to the technical field of hot water equipment, and discloses a cold and hot water valve and a water supply system.The cold and hot water valve comprises two valve body channels and a water return channel which are integrally formed, the two valve body channels are arranged in a spaced mode, and the water return channel is arranged between the two valve body channels and communicated with the two valve body channels; one of the two valve body channels is a hot water channel, the other one is a cold water channel, a one-way valve is arranged in the water return channel, water in the hot water channel can flow to the cold water channel through the one-way valve, one of the two valve body channels is provided with an opening structure, and the one-way valve is installed in the water return channel through the opening structure. The opening structure is blocked by a blocking structure. The cold and hot water valve is of an integrated structure, preparation of the integrally-formed cold and hot water valve is achieved through the arrangement of the opening structure, assembly is not needed in the using process, and using is convenient. The water supply system is convenient to install and use through the cold and hot water valve, and the function of zero cold water can be achieved.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and in particular to a hot and cold water valve and a water supply system. Background Technology

[0002] A water heater heats water in its pipes by circulating it through a pump. Once heated, the pipes are filled with hot water. If the user's water system has two pipes (without a return pipe), a hot and cold water valve needs to be installed at the furthest point from the user's home. This valve contains a check valve to prevent cold water from entering the hot water pipes when hot water is being used, allowing the water heater to circulate the hot water normally.

[0003] The existing H valve (cold and hot water valve) includes a cold water valve and a hot water valve. The cold water valve and the hot water valve are two separate products that need to be connected during use, which is inconvenient to install and use. Utility Model Content

[0004] The purpose of this utility model is to propose a hot and cold water valve and a water supply system, which solves the technical problem that the cold water valve and hot water valve of the existing hot and cold water valve are separate structures, resulting in inconvenience in use.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] This utility model provides a hot and cold water valve, including two integrally formed valve body channels and a return water channel. The two valve body channels are spaced apart, and the return water channel is located between the two valve body channels and connected to them. One of the two valve body channels is a hot water channel and the other is a cold water channel. A one-way valve is provided in the return water channel, allowing water in the hot water channel to flow to the cold water channel through the one-way valve. One of the two valve body channels has an opening structure, through which the one-way valve is installed in the return water channel. The opening structure is sealed by a sealing structure.

[0007] This hot and cold water valve comprises two integrally molded valve body channels and a return water channel. The return water channel is located between and connected to the two valve body channels. A one-way valve is installed in the return water channel to direct water flow from the hot water channel to the cold water channel, preventing cold water from entering the hot water channel when hot water is used, thus preventing cold water from seeping in. One of the two valve body channels has an opening structure. This opening structure facilitates the installation of the one-way valve into the return water channel and also facilitates the processing of the return water channel. After installation, the opening structure is sealed by a sealing structure to prevent leakage. This hot and cold water valve is a one-piece structure, and the opening structure enables its integral molding, eliminating the need for assembly during use and making it convenient to use.

[0008] As a preferred embodiment of the above-mentioned hot and cold water valve, the hot and cold water valve further includes a filter screen structure, which is disposed in the hot water channel, and the water in the hot water channel flows into the return water channel after being filtered by the filter screen structure.

[0009] The filter screen structure is installed inside the hot water channel. After the water in the hot water channel is filtered by the filter screen structure, it flows into the return water channel, which in turn filters the water entering the one-way valve, preventing the one-way valve from clogging and extending the service life of the one-way valve.

[0010] As a preferred embodiment of the above-mentioned hot and cold water valve, the filter screen structure is a cylindrical structure, and the filter screen structure extends axially along the hot water channel.

[0011] The filter screen has a cylindrical structure that extends axially along the hot water channel. This simple structure also provides self-cleaning. In zero-cold-water mode, water in the hot water channel enters the cold water pipe connected to the cold water channel through a one-way valve for heating and circulation. When impurities appear in the hot water channel, the filter screen structure on the inner wall of the hot water channel filters them to the inlet port of the return water channel, preventing them from entering the one-way valve and thus avoiding leakage caused by contamination. When water is used, the hot water channel is circulated, and the water flow washes away impurities adsorbed on the inner wall of the filter screen structure, carrying them towards the water user, thus achieving a self-cleaning effect.

[0012] As a preferred embodiment of the above-mentioned hot and cold water valve, an installation groove is provided on the inner wall of the return water channel near the opening structure. The installation groove extends through the end face of the return water channel near the opening structure along the axial direction of the return water channel, and the one-way valve is sealed and installed in the installation groove.

[0013] The mounting groove is designed for installing a check valve. The mounting groove extends axially through the end face of the return water channel near the opening structure, thus facilitating the installation of the check valve within the mounting groove.

[0014] As a preferred embodiment of the above-mentioned hot and cold water valve, the inner diameter of the end of the mounting groove near the opening structure gradually increases along the axial direction of the return water channel towards the opening structure.

[0015] The above configuration allows the check valve to easily extend into the mounting slot, preventing the check valve from being unable to be installed at the end of the mounting slot away from the opening.

[0016] As a preferred embodiment of the above-mentioned hot and cold water valve, the inner wall of the mounting groove near the opening structure is provided with a snap-fit ​​groove, and a limiting member for limiting the one-way valve is provided in the snap-fit ​​groove.

[0017] By setting a limiting element in the snap-fit ​​groove, the one-way valve can be limited to prevent it from coming out of the mounting groove.

[0018] As a preferred embodiment of the above-mentioned hot and cold water valve, the opening structure is disposed in the hot water channel, and the port of the return water channel at the end connected to the hot water channel is disposed opposite to the opening structure;

[0019] Alternatively, the opening structure is disposed in the cold water channel, and the port of the return water channel at the end connected to the cold water channel is disposed opposite to the opening structure.

[0020] When the open structure is installed on the hot water channel, the port of the return water channel connected to the hot water channel is positioned opposite the open structure to facilitate machining of the return water channel and installation of the check valve. When the open structure is installed on the cold water channel, the port of the return water channel connected to the cold water channel is positioned opposite the open structure to facilitate machining of the return water channel and installation of the check valve.

[0021] As a preferred embodiment of the above-mentioned hot and cold water valve, when the opening structure is provided in the hot water channel, the one-way valve is provided at the end of the return water channel connected to the hot water channel.

[0022] When the open structure is set in the hot water channel, the check valve is set at the end of the return water channel connected to the hot water channel. This setting makes the installation position of the check valve closer to the open structure, making it easier to install the check valve in place through the open structure.

[0023] As a preferred embodiment of the above-mentioned hot and cold water valve, when the opening structure is provided in the cold water channel, the one-way valve is provided at the end of the return water channel connected to the cold water channel.

[0024] When the open structure is set in the cold water channel, the check valve is set at the end of the return water channel connected to the cold water channel. This setting makes the installation position of the check valve closer to the open structure, making it easier to install the check valve in place through the open structure.

[0025] This utility model also provides a water supply system, including a hot water pipe, a cold water pipe, a water-using end, and a hot water supply device. The water-using end and the hot water supply device are connected by the hot water pipe and the cold water pipe to form a water supply pipeline. It also includes a hot and cold water valve as described above. The hot and cold water valve is connected to the end of the water supply pipeline near the water-using end to form a return water circulation path for circulating and heating the water in the hot water pipe between the water-using end and the hot water supply device.

[0026] This water supply system is easy to install and use due to the aforementioned hot and cold water valves, and it can also achieve the function of zero cold water.

[0027] The beneficial effects of this utility model are:

[0028] This utility model proposes a hot and cold water valve, which includes two integrally formed valve body channels and a return water channel. The return water channel is located between and connected to the two valve body channels. A one-way valve is installed in the return water channel to direct water from the hot water channel to the cold water channel, preventing cold water from entering the hot water channel when hot water is used, thus preventing cold water from seeping in. One of the two valve body channels has an opening structure. The opening structure facilitates the installation of the one-way valve into the return water channel and also facilitates the processing of the return water channel. After installation, the opening structure is sealed by a sealing structure to prevent leakage. This hot and cold water valve is an integral structure, and the opening structure enables the one-piece molding of the hot and cold water valve, eliminating the need for assembly during use and making it convenient to use.

[0029] The water supply system proposed in this utility model is relatively easy to install and use through the aforementioned hot and cold water valves, and it can also achieve the function of zero cold water. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the hot and cold water valve provided in Embodiment 1 of this utility model;

[0031] Figure 2 This is a cross-sectional view of the hot and cold water valve provided in Embodiment 1 of this utility model;

[0032] Figure 3 This is a cross-sectional view of the hot and cold water valve provided in Embodiment 1 of this utility model after removing its internal parts;

[0033] Figure 4 This is a schematic diagram of the hot and cold water valve provided in Embodiment 1 of this utility model when it is in zero cold water mode;

[0034] Figure 5 This is a schematic diagram of the water-using end of the hot and cold water valve provided in Embodiment 1 of this utility model when water is used;

[0035] Figure 6 This is a schematic diagram of the water supply system provided in Embodiment 1 of this utility model;

[0036] Figure 7 This is a schematic diagram of the hot and cold water valve provided in Embodiment 2 of this utility model;

[0037] Figure 8 This is a cross-sectional view of the hot and cold water valve provided in Embodiment 2 of this utility model.

[0038] In the picture:

[0039] 100. Hot and cold water valve; 200. Hot water pipe; 300. Cold water pipe; 400. Water supply end; 500. Hot water supply device;

[0040] 1. Hot water channel; 10. Open structure; 11. First hot water inlet / outlet; 12. Second hot water inlet / outlet;

[0041] 2. Cold water passage; 21. First cold water inlet / outlet; 22. Second cold water inlet / outlet;

[0042] 3. Return water channel; 31. Installation groove; 32. Snap-fit ​​groove;

[0043] 4. Check valve;

[0044] 5. Sealing structure;

[0045] 6. Filter screen structure; 7. Limiting components; 8. Sealing components. Detailed Implementation

[0046] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0047] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0048] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0049] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0050] Example 1:

[0051] like Figure 1 and Figure 2 As shown, this embodiment provides a hot and cold water valve 100, which includes two integrally formed valve body channels and a return water channel 3. The two valve body channels are spaced apart, and the return water channel 3 is located between the two valve body channels and connected to them. One of the two valve body channels is a hot water channel 1, and the other is a cold water channel 2. A one-way valve 4 is provided in the return water channel 3. The inlet of the one-way valve 4 faces the hot water channel 1, and the outlet of the one-way valve 4 faces the cold water channel 2. Water in the hot water channel 1 can flow to the cold water channel 2. One of the two valve body channels is provided with an opening structure 10. The one-way valve 4 is installed in the return water channel 3 through the opening structure 10, and the opening structure 10 is sealed by a sealing structure 5.

[0052] The hot and cold water valve 100 has an opening structure 10 on one of its two valve body channels. This opening structure 10 facilitates the installation of the one-way valve 4 into the return water channel 3 and also facilitates the machining of the return water channel 3. After the components of the hot and cold water valve 100 are installed, the opening structure 10 is sealed by the sealing structure 5 to prevent leakage. The hot and cold water valve 100 is a one-piece structure; the opening structure 10 enables the fabrication of a single, integrally molded hot and cold water valve 100, eliminating the need for assembly during use and making it convenient to use.

[0053] In this embodiment, the cold water channel 2 and the hot water channel 1 are arranged parallel and spaced apart, and the return water channel 3 is perpendicular to and connects the cold water channel 2 and the hot water channel 1, forming an H-shaped structure. Figure 1 and Figure 2 As shown, the bottom of the hot water channel 1 is the first hot water inlet / outlet 11, and the top is the second hot water inlet / outlet 12. The bottom of the cold water channel 2 is the first cold water inlet / outlet 21, and the top is the second cold water inlet / outlet 22. The return water channel 3 connects the cold water channel 2 and the hot water channel 1 at the middle position.

[0054] like Figure 2 and Figure 3As shown, an installation groove 31 is provided on the inner wall of the return water channel 3 near the opening structure 10. The installation groove 31 extends axially through the end face of the return water channel 3 near the opening structure 10. The one-way valve 4 is sealed and installed in the installation groove 31. The installation groove 31 is provided for installing the one-way valve 4. The installation groove 31 extends axially through the end face of the return water channel 3 near the opening structure 10, thereby facilitating the installation of the one-way valve 4 into the installation groove 31 from the end face of the return water channel 3.

[0055] Preferably, the inner diameter of the end of the mounting groove 31 near the opening structure 10 gradually increases along the axial direction of the return water channel 3 towards the opening structure 10. That is, the end of the mounting groove 31 near the opening structure 10 is a flared structure. The flared structure allows the one-way valve 4 to be inserted into the mounting groove 31 more easily, avoiding the one-way valve 4 being unable to be installed at the end of the mounting groove 31 away from the opening structure 10.

[0056] like Figure 2 As shown, the one-way valve 4 is installed in the mounting groove 31. The one-way valve 4 abuts against the end of the mounting groove 31 away from the opening structure 10. In order to prevent the one-way valve 4 from coming out of the mounting groove 31 from the end of the mounting groove 31 near the opening structure 10, a snap-fit ​​groove 32 is provided on the inner wall of the end of the mounting groove 31 near the opening structure 10. A limiting member 7 is provided in the snap-fit ​​groove 32 for limiting the one-way valve 4. The limiting member 7 can limit the movement of the one-way valve 4 toward the end of the mounting groove 31 near the opening structure 10, thereby preventing the one-way valve 4 from coming out of the mounting groove 31.

[0057] In this embodiment, the limiting member 7 is a retaining ring, which is engaged in the retaining groove 32. The retaining ring has a simple structure and is easy to assemble and disassemble. In other embodiments, the limiting member 7 is not limited to a retaining ring, as long as it can limit the movement of the retaining groove 32 along the end facing the mounting groove 31 near the opening structure 10.

[0058] To ensure the one-way valve 4 is sealed within the mounting groove 31, a sealing element 8 is provided between the one-way valve 4 and the mounting groove 31. In this embodiment, the one-way valve 4 has a circumferential groove, and the sealing element 8 is a sealing ring disposed within the groove. When the one-way valve 4 is installed in the mounting groove 31, the sealing ring can seal the gap between the one-way valve 4 and the mounting groove 31, thus preventing water leakage. In other embodiments, the groove can also be disposed on the inner wall of the mounting groove 31. Furthermore, the number of sealing rings is not limited to one; multiple sealing rings can be provided, arranged axially along the one-way valve 4, providing multiple sealing functions.

[0059] In this embodiment, the opening structure 10 is provided on the hot water channel 1, and the port of the return water channel 3 connected to the hot water channel 1 is positioned opposite to the opening structure 10, thereby facilitating the processing operation of the return water channel 3 through the opening structure 10, and also facilitating the installation of the one-way valve 4.

[0060] When the opening structure 10 is set in the hot water channel 1, the one-way valve 4 is set at the end of the return water channel 3 that is connected to the hot water channel 1, so that the installation position of the one-way valve 4 is closer to the opening structure 10, making it easier to install the one-way valve 4 in place through the opening structure 10.

[0061] like Figure 2 and Figure 3 As shown, the mounting groove 31 is located at the end of the return water channel 3 that is connected to the hot water channel 1. The mounting groove 31 extends through the end face of the end of the return water channel 3 connected to the hot water channel 1 along the axial direction of the return water channel 3, so as to facilitate the installation of the one-way valve 4 through the opening structure 10 on the hot water channel 1, and also to facilitate the processing of structures such as the mounting groove 31 and the snap-fit ​​groove 32 in the return water channel 3 through the opening structure 10.

[0062] In this embodiment, the end of the one-way valve 4 with an outlet abuts against the end of the mounting groove 31 away from the hot water channel 1, and the end of the one-way valve 4 with an inlet is provided with a groove for limiting the sealing ring, and the limiting member 7 is engaged with the end of the one-way valve 4 with an inlet.

[0063] Optionally, such as Figure 2 As shown, the hot and cold water valve 100 also includes a filter screen structure 6, which is installed in the hot water channel 1. The water in the hot water channel 1 flows into the return water channel 3 after being filtered by the filter screen structure 6, thereby filtering the water entering the one-way valve 4, preventing blockage of the one-way valve 4, and extending the service life of the one-way valve 4.

[0064] In this embodiment, the filter structure 6 is a cylindrical structure that extends axially along the hot water channel 1. The outer wall of the filter structure 6 is fitted against the inner wall of the hot water channel 1. This filter structure 6 is not only simple in structure but also has a self-cleaning function.

[0065] like Figure 4 As shown, in zero cold water mode, water in hot water channel 1 flows through one-way valve 4 into cold water pipe 300 connected to cold water channel 2 and back to hot water supply device 500 (see...). Figure 6 The heating cycle continues. When impurities appear in the hot water channel 1, the filter screen structure 6 installed on the inner wall of the hot water channel 1 will filter the impurities to the inlet port of the return water channel 3, preventing them from entering the one-way valve 4. This avoids the one-way valve 4 from being contaminated by impurities and causing leakage. Figure 5 As shown, when using end 400 (see...) Figure 6When water is used, hot water is passed through the hot water channel 1. The water flow will wash away the impurities adsorbed on the inner wall of the filter structure 6 and flow with the water to the water end 400, thus achieving the self-cleaning function of the filter structure 6.

[0066] Optionally, such as Figure 2 As shown, the sealing structure 5 is detachably installed inside the opening structure 10. The detachable sealing structure 5 facilitates the maintenance and replacement of the one-way valve 4.

[0067] Optionally, a sealing structure is provided between the sealing structure 5 and the opening structure 10 to prevent water leakage. Preferably, the sealing structure is a sealing ring, which has a simple structure and good sealing effect.

[0068] like Figure 6 As shown, this embodiment also provides a water supply system, including a hot water pipe 200, a cold water pipe 300, a water outlet 400, a hot water supply device 500, and a mixing valve, etc.; wherein, the water heated by the hot water supply device 500 is connected to the mixing valve through the hot water pipe 200, so as to use the mixing valve to mix the hot water supplied by the hot water supply device 500 and the cold water supplied by the cold water pipe 300 into water at a suitable temperature, and supply it to the water outlet 400 (such as a shower head, faucet, etc.) for user use.

[0069] To enable a traditional water supply system to have a zero-cold-water function, a hot and cold water valve 100 is typically installed within the system. A water supply pipeline is formed between the user end 400 and the hot water supply device 500 via a hot water pipe 200 and a cold water pipe 300. The hot and cold water valve 100 is connected to the end of the water supply pipeline closest to the user end 400, creating a return water circulation path for circulating and heating the water in the hot water pipe 200 between the user end 400 and the hot water supply device 500. Specifically, this hot and cold water valve 100 is usually located close to the user end 400. Connected to the cold water pipe 300 and the hot water pipe 200, it forms a return water circulation path within the water supply system. Thus, when the zero-cold-water mode is activated, the cold water from the user end 400 is first returned to the hot water supply device 500 through this return water circulation path. Once heated by the hot water supply device 500, the hot water is then supplied to the user end 400, preventing cold water from initially flowing from the user end 400.

[0070] like Figure 6 As shown, the first hot water inlet / outlet 11 is connected to the hot water supply device 500 via a hot water pipe 200, the second hot water inlet / outlet 12 is connected to the water user 400, the first cold water inlet / outlet 21 is connected to the hot water supply device 500 via a cold water pipe 300, and the second cold water inlet / outlet 22 is connected to the water user 400.

[0071] To obtain hot water at the desired temperature at the water outlet 400, a mixing valve (not shown in the figure) is connected between the hot water pipe 200 and the cold water pipe 300 between the hot water valve 100 and the water outlet 400. The mixing valve mixes the hot water supplied by the hot water supply device 500 and the cold water supplied by the cold water pipe 300 to create water at a suitable temperature, which is then supplied to the water outlet 400 for user use. In this embodiment, the hot water supply device 500 is a water heater. In other embodiments, the hot water supply device 500 can be any other heating device with water heating function, and no specific limitation is made here.

[0072] The water in the hot water pipe 200 between the water outlet 400 and the hot water supply device 500 will cool down due to prolonged periods of inactivity at the water outlet 400. A circulation pump within the hot water supply device 500 will cause the water in the hot water pipe 200 between the hot and cold water valve 100 and the hot water supply device 500 to flow back to the hot water supply device 500 via the one-way valve 4 in the return water channel 3 and the cold water pipe 300 for reheating. This is the zero-cold-water mode. Since the hot and cold water valve 100 is located close to the water outlet 400, the amount of water in the hot water pipe 200 between the hot and cold water valve 100 and the water outlet 400 can be ignored.

[0073] Specifically, in zero cold water mode, the cold water channel 2 and the hot water channel 1 are connected through the return water channel 3. The hot and cold water valve 100, the cold water pipe 300, the hot water pipe 200, and the hot water supply device 500 form a return water circulation circuit. The water in the hot water pipe 200 between the hot and cold water valve 100 and the hot water supply device 500 flows from the hot water channel 1 to the cold water channel 2 through the return water channel 3. After being heated by the hot water supply device 500, it is then supplied to the water end 400.

[0074] Example 2:

[0075] like Figure 7 and Figure 8 As shown, this embodiment provides a hot and cold water valve 100. The difference between the hot and cold water valve 100 in this embodiment and the first embodiment is that the position of the opening structure 10 and the position of the one-way valve 4 are different.

[0076] In this embodiment, the opening structure 10 is provided in the cold water channel 2, and the port of the return water channel 3 connected to the cold water channel 2 is provided opposite to the opening structure 10, so as to facilitate the processing operation of the return water channel 3 and the installation of the one-way valve 4.

[0077] like Figure 8 As shown, the left side is set as hot water channel 1, and the right side is set as cold water channel 2. Water flows from the hot water channel 1 on the left side to the cold water channel 2 on the right side.

[0078] Optionally, when the opening structure 10 is provided in the cold water channel 2, the one-way valve 4 is provided at the end of the return water channel 3 connected to the cold water channel 2. This arrangement makes the installation position of the one-way valve 4 closer to the opening structure 10, which facilitates the installation of the one-way valve 4 through the opening structure 10.

[0079] At this time, the mounting groove 31 is set at the end of the return water channel 3 that is connected to the cold water channel 2. The mounting groove 31 extends through the end face of the end of the return water channel 3 that is connected to the cold water channel 2 along the axial direction of the return water channel 3, so as to facilitate the installation of the check valve 4.

[0080] like Figure 8 As shown, the inlet end of the check valve 4 abuts against the end of the mounting groove 31 away from the cold water channel 2, and the outlet end of the check valve 4 faces the cold water channel 2. A groove is provided on the outer periphery of the inlet end of the check valve 4 to limit the sealing ring, and the outlet end of the check valve 4 is limited by the limiting member 7.

[0081] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A hot and cold water valve, characterized in that The cold and hot water valve (100) comprises two valve body channels and a backwater channel (3) which are integrally formed, the two valve body channels are arranged at intervals, the backwater channel (3) is arranged between the two valve body channels and communicates with the two valve body channels, one of the two valve body channels is a hot water channel (1), and the other is a cold water channel (2), a one-way valve (4) is arranged in the backwater channel (3), water in the hot water channel (1) can flow to the cold water channel (2) through the one-way valve (4), one of the two valve body channels is provided with an opening structure (10), the one-way valve (4) is installed in the backwater channel (3) through the opening structure (10), and the opening structure (10) is blocked by a blocking structure (5).

2. The hot and cold water valve according to claim 1, wherein The cold and hot water valve (100) further comprises a filter screen structure (6), the filter screen structure (6) is arranged in the hot water channel (1), and water in the hot water channel (1) flows into the backwater channel (3) after being filtered through the filter screen structure (6).

3. The hot and cold water valve according to claim 2, wherein The filter screen structure (6) is a cylindrical structure, and the filter screen structure (6) extends along the axial direction of the hot water channel (1).

4. The hot and cold water valve according to claim 1, wherein An inner wall of one end of the backwater channel (3) close to the opening structure (10) is provided with a mounting groove (31), the mounting groove (31) penetrates the end face of the one end of the backwater channel (3) close to the opening structure (10) along the axial direction of the backwater channel (3), and the one-way valve (4) is sealingly mounted in the mounting groove (31).

5. The hot and cold water valve according to claim 4, wherein The inner diameter of the one end of the mounting groove (31) close to the opening structure (10) gradually increases in the axial direction of the backwater channel (3) towards the opening structure (10).

6. The hot and cold water valve according to claim 4, wherein The inner wall of the one end of the mounting groove (31) close to the opening structure (10) is provided with a clamping groove (32), and the clamping groove (32) is provided with a limiting piece (7) for limiting the one-way valve (4).

7. The hot and cold water valve according to any one of claims 1-6, characterized in that The opening structure (10) is arranged in the hot water channel (1), and the port of the one end of the backwater channel (3) communicating with the hot water channel (1) is arranged opposite to the opening structure (10). Alternatively, the opening structure (10) is arranged in the cold water channel (2), and the port of the one end of the backwater channel (3) communicating with the cold water channel (2) is arranged opposite to the opening structure (10).

8. The hot and cold water valve according to claim 7, wherein When the opening structure (10) is arranged in the hot water channel (1), the one-way valve (4) is arranged at the one end of the backwater channel (3) communicating with the hot water channel (1).

9. The hot and cold water valve according to claim 7, wherein When the opening structure (10) is arranged in the cold water channel (2), the one-way valve (4) is arranged at the one end of the backwater channel (3) communicating with the cold water channel (2).

10. Water supply system, characterized in that The cold and hot water valve (100) comprises two valve body channels and a backwater channel (3) which are integrally formed, the two valve body channels are arranged at intervals, the backwater channel (3) is arranged between the two valve body channels and communicates with the two valve body channels, one of the two valve body channels is a hot water channel (1), and the other is a cold water channel (2), a one-way valve (4) is arranged in the backwater channel (3), water in the hot water channel (1) can flow to the cold water channel (2) through the one-way valve (4), one of the two valve body channels is provided with an opening structure (10), the one-way valve (4) is installed in the backwater channel (3) through the opening structure (10), and the opening structure (10) is blocked by a blocking structure (5). The hot water pipe (200), the cold water pipe (300), the water using end (400) and the hot water supply device (500) are connected through the hot water pipe (200) and the cold water pipe (300) to form a water using pipe, and the cold-hot water valve according to any one of claims 1-9 is connected to one end of the water using pipe close to the water using end (400) to form a backwater circulating water pipe for circulating heating water in the hot water pipe (200) between the water using end (400) and the hot water supply device (500).

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