A drain valve and water heater

Abstract

The utility model discloses a sewage valve and water heater belongs to water heater technical field, and sewage valve includes valve body and valve core subassembly, and the inside of valve body is provided with valve cavity and water passageway, and is provided with water passageway between valve cavity and water passageway, and the sewage outlet that is communicated with valve cavity and the water inlet and the water outlet that are communicated with water passageway are seted up on valve body, valve core subassembly includes valve core body and valve rod, and valve core body sets up in valve cavity, and valve rod is connected with valve core body, and valve rod can rotate around self axis to drive valve core body and moves along the straight line, and valve core body is used for opening or closing water passageway. Water heater includes above -mentioned sewage valve. Through the integration of water inlet in valve body, improve the integration, can realize water inlet, also can realize sewage, and the axial displacement of valve rod does not exist, is convenient for the sealing of valve rod, avoids the water leakage problem, and reduces the space occupation, guarantees compactness, is applicable to the installation of narrow space.

Description

Technical Field

[0001] This utility model relates to the field of water heater technology, and in particular to a drain valve and a water heater. Background Technology

[0002] A water heater consists of a heating element and an inner tank. The heating element heats the water in the inner tank to produce hot water for the user. The inner tank is connected to an inlet pipe and an outlet pipe. Cold water enters the inner tank through the inlet pipe, and the heated water flows out through the outlet pipe.

[0003] To connect to the water inlet pipe, the inner tank has a water inlet port with an inlet valve that connects to the water inlet pipe. The inner tank also has a drain port with a drain valve to remove scale and impurities from the inner tank. The various valves on the inner tank are relatively independent, with low integration, and the numerous openings required to accommodate multiple valves reduce the structural strength of the inner tank and make it difficult to manufacture.

[0004] Existing drain valves consist of a valve body, a valve core, and a valve stem. The valve body has two openings: one connects to the inner tank, and the other connects to the outside. The valve core is located within the valve body and is opened or closed by the valve stem. When draining is required, the valve core opens, connecting the two openings to allow drainage. The valve stem typically needs to move in a straight line to move the valve core in the same direction. This makes sealing between the valve stem and the valve body difficult, easily leading to leakage. Furthermore, the straight-line movement of the valve stem occupies significant external space, making it unsuitable for use in confined spaces and limiting its applicability. Utility Model Content

[0005] This utility model provides a drain valve and a water heater to solve the technical problems of low integration and large space occupation of drain valves in the prior art.

[0006] Based on the above concept, the technical solution adopted by this utility model is as follows:

[0007] A drain valve, comprising:

[0008] The valve body has a valve cavity and a water passage inside. A water outlet is provided between the valve cavity and the water passage. The valve body has a drain outlet communicating with the valve cavity and an inlet and an outlet communicating with the water passage.

[0009] The valve core assembly includes a valve core body and a valve stem. The valve core body is disposed in the valve cavity, and the valve stem is connected to the valve core body. The valve stem is capable of rotating about its own axis to drive the valve core body to move in a straight line. The valve core body is used to open or close the water inlet.

[0010] Preferably, the valve core assembly further includes a valve seat, which is connected to the valve body. The valve stem is rotatably disposed on the valve seat, and the valve core body is slidably connected to the valve seat. The valve seat is used to restrict the rotation of the valve core body.

[0011] Preferably, the valve stem extends along the moving direction of the valve core body, and the valve stem is threadedly connected to the valve core body.

[0012] Preferably, a first limiting cavity is formed inside the valve seat, a first limiting surface is formed on the inner wall of the first limiting cavity, and a second limiting surface is formed on the outer wall of the valve core body. The valve core body is inserted into the first limiting cavity so that the first limiting surface and the second limiting surface cooperate to restrict the rotation of the valve core body.

[0013] Preferably, the valve seat has an internal mounting cavity that communicates with the first limiting cavity. A step is provided between the mounting cavity and the first limiting cavity. A limiting portion is provided on the outer periphery of the valve stem. The limiting portion is located within the first limiting cavity and is limited to the step.

[0014] Preferably, a second limiting cavity is formed inside the valve core body, and an internal thread is formed on the inner wall of the second limiting cavity. The valve stem has a threaded section, and the valve stem is inserted into the second limiting cavity so that the threaded section is connected to the internal thread.

[0015] Preferably, the valve seat is threadedly connected to the valve body, and / or a first seal is provided between the valve stem and the valve seat.

[0016] Preferably, a sealing surface is formed around the water inlet in the valve cavity, and a sealing protrusion is provided on the sealing surface. A second sealing element is provided on the valve core body. When the valve core body closes the water inlet, the second sealing element abuts against the sealing protrusion.

[0017] Preferably, the valve core body has a recessed mounting groove at its end, the second seal engages with the mounting groove and at least a portion of the second seal protrudes from the mounting groove, and when the second seal abuts against the sealing protrusion, the end of the valve core body abuts against the sealing surface; and / or, along the moving direction of the valve core body, the thickness of the second seal is D, and when the valve core body closes the water inlet, the compression of the second seal is 30%D to 40%D.

[0018] Preferably, the inlet and outlet are located on adjacent sides of the valve body, the through port and outlet are directly opposite each other, and the inlet and drain port are located on opposite sides of the valve body; and / or, when the valve core body opens the through port, the valve core body moves in a straight line for a stroke of 3mm to 5mm.

[0019] A water heater includes a shell, an inner tank, and a drain valve as described above, wherein the inner tank is disposed inside the shell, and the outlet of the drain valve is connected to the inner tank.

[0020] The beneficial effects of this utility model are:

[0021] The drain valve proposed in this utility model has a valve cavity and a water passage inside the valve body. A water inlet is provided between the valve cavity and the water passage. The valve body has a drain port communicating with the valve cavity and a water inlet and an outlet communicating with the water passage. The valve stem can rotate around its own axis to drive the valve core body to move linearly. The valve core body is used to open or close the water inlet. By integrating the water inlet into the valve body, the integration is improved, enabling both water intake and drainage. When the valve core body closes the water inlet, the water inlet, water passage, and outlet are connected, allowing water to enter the container. When the valve core body opens the water inlet, the water outlet, water passage, and drain port are connected, allowing water to be discharged from the container. The valve stem rotates around its own axis to drive the valve core body to move linearly, and there is no axial displacement of the valve stem, which facilitates sealing of the valve stem, avoids water leakage, reduces space occupation, ensures structural compactness, and is suitable for installation in confined spaces.

[0022] The water heater proposed in this utility model integrates the water inlet into the valve body by employing the aforementioned drain valve. This allows for both water intake and drainage, reducing the number of openings on the inner tank, ensuring the structural strength of the inner tank, and facilitating manufacturing. The valve stem rotates around its own axis to drive the valve core body to move linearly. The valve stem has no axial displacement, facilitating sealing and preventing leakage. Furthermore, it reduces space occupation, ensuring a compact structure suitable for installation in confined spaces. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the drain valve provided in this embodiment of the utility model;

[0024] Figure 2 This is a cross-sectional view of the drain valve with its inlet closed according to an embodiment of the present invention;

[0025] Figure 3 yes Figure 2 Enlarged view of point A;

[0026] Figure 4 This is a cross-sectional view of the drain valve with its inlet open, provided in this embodiment of the utility model.

[0027] Figure 5 yes Figure 4 Enlarged view of point B;

[0028] Figure 6This is a front view of the drain valve provided in this embodiment of the utility model;

[0029] Figure 7 yes Figure 6 CC-direction sectional view;

[0030] Figure 8 This is a cross-sectional view of the valve body provided in an embodiment of this utility model;

[0031] Figure 9 This is a cross-sectional view of the valve seat provided in an embodiment of this utility model;

[0032] Figure 10 This is a schematic diagram of the valve core assembly provided in an embodiment of the present invention;

[0033] Figure 11 This is an exploded structural diagram of the valve core assembly provided in this embodiment of the utility model;

[0034] Figure 12 This is a schematic diagram of the valve seat provided in an embodiment of the present invention;

[0035] Figure 13 This is a schematic diagram of the valve stem structure provided in an embodiment of the present utility model;

[0036] Figure 14 This is a schematic diagram of the valve core body provided in an embodiment of the present utility model.

[0037] In the picture:

[0038] 10. Valve body; 11. Valve cavity; 12. Water passage; 13. Water inlet; 14. Drain outlet; 15. Water inlet; 16. Water outlet; 17. Mounting port; 18. Sealing surface; 19. Sealing protrusion;

[0039] 20. Valve core assembly; 21. Valve core body; 211. Second limiting surface; 212. Second limiting cavity; 213. Mounting groove; 214. Mounting part; 22. Valve stem; 221. Threaded section; 222. Limiting part; 223. Slot; 224. Grip part; 23. Valve seat; 231. First limiting cavity; 232. First limiting surface; 233. Mounting cavity; 234. Stepped part; 24. First seal; 25. Limiting retaining ring; 26. Second seal;

[0040] 30. Locking nut; 40. Locking washer. Detailed Implementation

[0041] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0042] 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.

[0043] 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.

[0044] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0045] See Figures 1 to 14 This embodiment provides a drain valve, including a valve body 10 and a valve core assembly 20. The valve body 10 has a valve cavity 11 and a water passage 12 inside. A water outlet 13 is provided between the valve cavity 11 and the water passage 12. The valve body 10 has a drain outlet 14 communicating with the valve cavity 11 and a water inlet 15 and an outlet 16 communicating with the water passage 12. The valve core assembly 20 includes a valve core body 21 and a valve stem 22. The valve core body 21 is disposed in the valve cavity 11. The valve stem 22 is connected to the valve core body 21. The valve stem 22 can rotate around its own axis to drive the valve core body 21 to move in a straight line. The valve core body 21 is used to open or close the water outlet 13.

[0046] By integrating the inlet 15 into the valve body 10, the integration is improved, enabling both water intake and drainage; when the valve core body 21 closes the inlet 13, as... Figure 2 and Figure 3As shown, the inlet 15, the water passage 12, and the outlet 16 are connected, enabling water to enter the container; when the valve core body 21 opens the water passage 13, as... Figure 4 and Figure 5 As shown, the water outlet 16, the water passage 12, and the sewage outlet 14 are connected, which enables the water in the container to be discharged. Figure 2 and Figure 4 The middle arrow indicates the direction of water flow. The valve stem 22 rotates around its own axis to drive the valve core body 21 to move in a straight line. The valve stem 22 has no axial displacement, which facilitates sealing of the valve stem 22, avoids water leakage, reduces space occupation, ensures structural compactness, and is suitable for installation in confined spaces.

[0047] The valve body 10 supports the valve core assembly 20. A water inlet 13 is provided between the valve cavity 11 and the water passage 12, allowing the valve core body 21 to either isolate or connect the valve cavity 11 and the water passage 12. The drain port 14 connects to the valve cavity 11, while the inlet 15 and outlet 16 connect to the water passage 12. The layout of the inlet 15, outlet 16, and drain port 14 can be configured according to actual needs. For example, the inlet 15 and outlet 16 are located on adjacent sides of the valve body 10, the water inlet 13 and outlet 16 are directly opposite each other, and the inlet 15 and drain port 14 are located on opposite sides of the valve body 10. This arrangement of the inlet 15, outlet 16, and drain port 14 makes full use of space, resulting in a compact structure.

[0048] For example, the valve core body 21 is movable along a first straight line. The water inlet 13 and the water outlet 16 are directly opposite each other along the first straight line, and the water inlet 15 and the drain outlet 14 are spaced apart along the first straight line so that the water inlet 15 can communicate with the water passage 12 and the drain outlet 14 can communicate with the valve cavity 11. The water inlet 15 and the drain outlet 14 are distributed on opposite sides of the valve body 10 along a second straight line, which is perpendicular to the first straight line.

[0049] In use, the drain valve can be applied to containers or pipes capable of holding liquids. The inlet 15 can face upwards to allow water to flow into the water passage 12 under gravity, while the drain outlet 14 can face downwards to allow waste to flow out under gravity. For example, the inlet 15 is connected to an inlet pipe equipped with a switch valve. During draining, the switch valve is closed. When the valve core body 21 opens the water passage 13, the outlet 16, the water passage 12, and the drain outlet 14 are connected, enabling the water in the container to be drained.

[0050] When opening or closing the water inlet 13, simply rotate the valve stem 22. The valve stem 22 rotates around its own axis, driving the valve core body 21 to move linearly. The valve stem 22 and the valve core body 21 can be connected by threads, gears, racks, etc. The valve stem 22 can be directly connected to the valve body 10 or indirectly connected to the valve body 10.

[0051] In this embodiment, the valve core assembly 20 further includes a valve seat 23, which is connected to the valve body 10. The valve stem 22 is rotatably mounted on the valve seat 23, and the valve core body 21 is slidably connected to the valve seat 23. The valve seat 23 is used to restrict the rotation of the valve core body 21. The valve seat 23 supports the valve stem 22, allowing the valve stem 22 to rotate stably around its own axis. The valve seat 23 also limits the rotation of the valve core body 21, ensuring that the valve core body 21 can only slide linearly along the valve seat 23 when the valve stem 22 rotates, thereby enabling the valve core body 21 to open or close the water inlet 13.

[0052] For example, the valve stem 22 extends along the moving direction of the valve core body 21, and the valve stem 22 is threadedly connected to the valve core body 21. Due to the limiting effect of the valve seat 23 on the valve core body 21, the valve core body 21 is driven to move in a straight line by the rotation of the valve stem 22 around its own axis through the threaded connection.

[0053] For example, the extension direction of the valve stem 22 is perpendicular to the movement direction of the valve core body 21. A gear is provided on the valve stem 22, and a rack is provided on the valve core body 21. The rack meshes with the gear. Due to the limiting effect of the valve seat 23 on the valve core body 21, the rotation of the valve stem 22 around its own axis causes the gear to drive the rack to move linearly, thereby driving the valve core body 21 to move in a straight line.

[0054] When the valve core body 21 opens the water inlet 13, the linear movement of the valve core body 21 is 3mm to 5mm. For example, the linear movement of the valve core body 21 when opening the water inlet 13 can be 3mm, 3.5mm, 4mm, 4.5mm, or 5mm. If the linear movement of the valve core body 21 is less than 3mm, the water inlet 13 is too close to the valve core body 21, resulting in a smaller water flow rate, which is not conducive to rapid sewage discharge. If the linear movement of the valve core body 21 is greater than 5mm, the water inlet 13 is fully open, and the longer movement distance of the valve core body 21 will occupy more space, affecting the structural compactness.

[0055] The valve seat 23 is connected to the valve body 10, which can be a snap-fit ​​or a threaded connection. Exemplarily, the valve seat 23 is threaded to the valve body 10 for easy installation and disassembly. The valve body 10 has a mounting port 17 that communicates with the valve cavity 11, and the valve seat 23 is located at the mounting port 17. The mounting port 17 has an internal thread, and the valve seat 23 has an external thread; a portion of the valve seat 23 is inserted into the mounting port 17 so that the internal thread connects with the external thread. In this embodiment, the outlet 16, the through port 13, and the mounting port 17 are arranged sequentially along a first straight line. To ensure sealing, a sealing ring can be provided between the valve seat 23 and the valve body 10.

[0056] The valve core body 21 is slidably connected to the valve seat 23. Optionally, the valve seat 23 is provided with a sliding groove, the extension direction of which is parallel to the valve stem 22. The valve core body 21 is provided with a slider, which is slidably connected to the sliding groove. The slider and the sliding groove cooperate to limit the valve core body 21, thereby restricting the rotation of the valve core body 21, so that when the valve stem 22 rotates, the valve core body 21 can only slide linearly along the valve seat 23.

[0057] In this embodiment, a first limiting cavity 231 is formed inside the valve seat 23, and a first limiting surface 232 is formed on the inner wall of the first limiting cavity 231. A second limiting surface 211 is formed on the outer wall of the valve core body 21. The valve core body 21 is inserted into the first limiting cavity 231 so that the first limiting surface 232 and the second limiting surface 211 cooperate to restrict the rotation of the valve core body 21. The cooperation of the first limiting surface 232 and the second limiting surface 211 limits the valve core body 21, simplifying the structure and reducing the number of parts.

[0058] Optionally, the outer periphery of the valve core body 21 is cylindrical, and the second limiting surface 211 is a plane disposed on the outer wall of the valve core body 21 and parallel to the axis of the valve core body 21. The inner wall of the first limiting cavity 231 is cylindrical, and the first limiting surface 232 is a plane disposed on the inner wall of the first limiting cavity 231 and parallel to the axis of the first limiting cavity 231.

[0059] Optionally, the outer peripheral surface of the valve core body 21 is a quadrangular prism surface, and the inner wall of the first limiting cavity 231 is a quadrangular prism surface, that is, at least part of the outer contour of the valve core body 21 is a quadrangular prism. Optionally, as... Figure 6 , Figure 7 , Figure 12 and Figure 14 As shown, the outer peripheral surface of the valve core body 21 is a hexagonal prism, and the inner wall of the first limiting cavity 231 is a hexagonal prism, that is, at least part of the outer contour of the valve core body 21 is a hexagonal prism.

[0060] The valve seat 23 has an internal mounting cavity 233 through which the valve stem 22 rotatably passes. To ensure sealing, a first sealing element 24 is provided between the valve stem 22 and the valve seat 23. For example, a groove 223 is provided on the outer circumferential surface of the valve stem 22, and the first sealing element 24 engages with the groove 223, with the groove 223 acting as a limit for the first sealing element 24.

[0061] The mounting cavity 233 is connected to the first limiting cavity 231. A step portion 234 is provided between the mounting cavity 233 and the first limiting cavity 231. A limiting portion 222 is provided on the outer periphery of the valve stem 22. The limiting portion 222 is located within the first limiting cavity 231 and is limited by the step portion 234. By providing the step portion 234, the valve stem 22 is limited. The limiting portion 222 is located within the first limiting cavity 231 and is limited by the step portion 234, that is, the valve stem 22 cannot slide out of the first limiting cavity 231 along the direction from the first limiting cavity 231 to the mounting cavity 233.

[0062] A portion of the valve stem 22 is located outside the mounting cavity 233, forming a gripping portion 224 to facilitate rotation of the valve stem 22 by the operator. On the side of the stepped portion 234 away from the limiting portion 222, a limiting ring 25 is provided on the valve stem 22. The limiting ring 25 engages with the valve stem 22 and is confined within the stepped portion 234. The limiting ring 25 cooperates with the limiting portion 222, fixing the valve stem 22 in its axial position, allowing it to rotate only along its axis.

[0063] A second limiting cavity 212 is formed inside the valve core body 21. The inner wall of the second limiting cavity 212 has an internal thread. The valve stem 22 has a threaded section 221. The valve stem 22 is inserted into the second limiting cavity 212 so that the threaded section 221 connects with the internal thread. The second limiting cavity 212 facilitates threaded connection with the valve stem 22, fully utilizing space and ensuring structural compactness. Furthermore, the second limiting cavity 212 is located inside the valve core body 21. The second limiting surface 211 formed on the outer wall of the valve core body 21 mates with the first limiting cavity 231 on the valve seat 23. This means the first limiting cavity 231 is located outside the second limiting cavity 212. The mating position of the first limiting surface 232 and the second limiting surface 211 protects the threaded connection between the valve core body 21 and the valve stem 22, preventing foreign objects from entering the second limiting cavity 212 and avoiding jamming of the threaded connection.

[0064] In some embodiments, a cleaning brush is provided on the valve seat 23 around the outer periphery of the valve core body 21, and the cleaning brush contacts the outer peripheral surface of the valve core body 21. When the valve stem 22 rotates and drives the valve core body 21 to move, the cleaning brush cleans the outer peripheral surface of the valve core body 21 to prevent dirt from sticking to the outer peripheral surface of the valve core body 21 and causing the valve core body 21 to slide poorly.

[0065] In some embodiments, a filter screen is provided between the valve seat 23 and the valve core body 21, and the filter screen covers the connection between the valve seat 23 and the valve core body 21. The filter screen filters out dirt to prevent dirt from entering the first limiting cavity 231 and causing the valve core body 21 to slide improperly.

[0066] The valve core body 21 can seal the water inlet 13. This can be achieved by the valve core body 21 itself abutting against the water inlet 13 to seal the water inlet 13, or by the valve core body 21 being provided with a second sealing element 26, which abuts against the edge of the water inlet 13 to seal the water inlet 13.

[0067] To improve sealing performance, in this embodiment, a sealing surface 18 is formed around the water inlet 13 within the valve cavity 11. A sealing protrusion 19 is provided on the sealing surface 18, and a second sealing element 26 is provided on the valve core body 21. When the valve core body 21 closes the water inlet 13, the second sealing element 26 abuts against the sealing protrusion 19. By configuring the sealing protrusion 19 to cooperate with the second sealing element 26, when the second sealing element 26 presses against the sealing protrusion 19, the second sealing element 26 gradually undergoes elastic deformation, preventing foreign objects from existing between the second sealing element 26 and the sealing protrusion 19, ensuring a surface-to-surface fit between the sealing protrusion 19 and the second sealing element 26, thus improving sealing performance. To prevent the sealing protrusion 19 from damaging the second sealing element 26, the surface of the sealing protrusion 19 is a smooth surface.

[0068] For example, the valve core body 21 has a recessed mounting groove 213 at its end. The second seal 26 engages with the mounting groove 213, and at least part of the second seal 26 protrudes from the mounting groove 213. When the second seal 26 abuts against the sealing protrusion 19, the end of the valve core body 21 abuts against the sealing surface 18. By setting the second seal 26 to protrude from the mounting groove 213, it is easier for the protruding second seal 26 to abut against the sealing protrusion 19. To prevent the sealing protrusion 19 from damaging the second seal 26, after the second seal 26 undergoes a certain degree of elastic deformation, the end of the valve core body 21 abuts against the sealing surface 18 to prevent excessive deformation of the second seal 26 from causing tearing or other damage, thus protecting the second seal 26.

[0069] like Figure 5 As shown, along the moving direction of the valve core body 21, the thickness of the second seal 26 is D. When the valve core body 21 closes the water inlet 13, the compression of the second seal 26 is 30%D to 40%D. The compression of the second seal 26 ensures sealing performance without damaging the second seal 26, thus guaranteeing its service life.

[0070] Along the moving direction of the valve core body 21, the thickness of the second seal 26 is 2mm to 3mm. For example, along the moving direction of the valve core body 21, the thickness of the second seal 26 is 2.5mm, and when the valve core body 21 closes the water inlet 13, the compression of the second seal 26 is 0.75mm to 1mm.

[0071] A mounting portion 214 is formed inside the mounting groove 213 on the valve core body 21, and the second seal 26 is fitted onto the mounting portion 214. To confine the second seal 26 within the valve core body 21 and prevent it from detaching from the mounting portion 214, a locking element, such as a retaining ring or nut, can be provided on the mounting portion 214 to limit the second seal 26. Alternatively, the edge of the mounting portion 214 can be flanged outwards, thereby limiting the second seal 26.

[0072] like Figures 1 to 7 As shown, the drain valve also includes a locking nut 30 and a locking washer 40. A locking thread is provided on the outer periphery of the inlet 15. The locking nut 30 is located on the outside of the inlet 15 and connected to the locking thread. The locking washer 40 is located on the inside of the locking nut 30 and inserted into the inlet 15. By providing the locking nut 30 and the locking washer 40, it is convenient to connect the inlet 15 of the valve body 10 to other components, such as an inlet pipe.

[0073] This embodiment also provides a water heater, including a shell, an inner tank, and the aforementioned drain valve. The inner tank is located inside the shell, and the drain valve's outlet 16 communicates with the inner tank. By integrating the inlet 15 into the valve body 10, both water intake and drainage can be achieved, reducing the number of openings on the inner tank, ensuring the structural strength of the inner tank, and facilitating manufacturing. When the valve core body 21 closes the water inlet 13, the water inlet 15, the water passage 12, and the outlet 16 are connected, allowing water to enter the inner tank; when the valve core body 21 opens the water inlet 13, the outlet 16, the water passage 12, and the drain port 14 are connected, allowing water to be discharged from the inner tank. The valve core body 21 is driven to move linearly by the rotation of the valve stem 22 around its own axis. The valve stem 22 has no axial displacement, facilitating sealing of the valve stem 22, preventing water leakage, reducing space occupation, ensuring structural compactness, and making it suitable for installation in confined spaces.

[0074] The outlet 16 is connected to the inner tank. The inner tank may have a pipe fitting, and the outlet 16 may have an internal thread, allowing for threaded connection between the outlet 16 and the pipe fitting. The inlet 15 can be connected to an inlet pipe, which may be a copper pipe. The inlet pipe is inserted into the inlet 15, and a locking washer 40 is clamped between the inlet pipe and the valve body 10. Tightening the locking nut 30 causes the locking washer 40 to elastically deform, thus locking the valve body 10 and the inlet pipe.

[0075] In other embodiments, the drain valve can be used on other containers or pipes capable of holding liquids.

[0076] The above embodiments merely illustrate the basic principles and characteristics of this utility model. This utility model is not limited to the above embodiments. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A drain valve, characterized in that, include: The valve body (10) has a valve cavity (11) and a water passage (12) inside. A water outlet (13) is provided between the valve cavity (11) and the water passage (12). The valve body (10) is provided with a drain outlet (14) communicating with the valve cavity (11) and a water inlet (15) and a water outlet (16) communicating with the water passage (12). The valve core assembly (20) includes a valve core body (21) and a valve stem (22). The valve core body (21) is disposed in the valve cavity (11). The valve stem (22) is connected to the valve core body (21). The valve stem (22) can rotate around its own axis to drive the valve core body (21) to move in a straight line. The valve core body (21) is used to open or close the water inlet (13).

2. The drain valve according to claim 1, characterized in that, The valve core assembly (20) further includes a valve seat (23), which is connected to the valve body (10). The valve stem (22) is rotatably disposed on the valve seat (23). The valve core body (21) is slidably connected to the valve seat (23). The valve seat (23) is used to restrict the rotation of the valve core body (21).

3. The drain valve according to claim 2, characterized in that, The valve stem (22) extends along the moving direction of the valve core body (21), and the valve stem (22) is threadedly connected to the valve core body (21).

4. The drain valve according to claim 2, characterized in that, The valve seat (23) forms a first limiting cavity (231) inside, the inner wall of the first limiting cavity (231) forms a first limiting surface (232), the outer wall of the valve core body (21) forms a second limiting surface (211), and the valve core body (21) is inserted into the first limiting cavity (231) so that the first limiting surface (232) and the second limiting surface (211) cooperate to restrict the rotation of the valve core body (21).

5. The drain valve according to claim 4, characterized in that, The valve seat (23) has an internal mounting cavity (233) that communicates with the first limiting cavity (231). A step portion (234) is provided between the mounting cavity (233) and the first limiting cavity (231). A limiting portion (222) is provided on the outer periphery of the valve stem (22). The limiting portion (222) is located in the first limiting cavity (231) and is limited to the step portion (234).

6. The drain valve according to claim 3, characterized in that, The valve core body (21) forms a second limiting cavity (212) inside, and the inner wall of the second limiting cavity (212) forms an internal thread. The valve stem (22) has a threaded section (221), and the valve stem (22) is inserted into the second limiting cavity (212) so that the threaded section (221) is connected to the internal thread.

7. The drain valve according to claim 2, characterized in that, The valve seat (23) is threadedly connected to the valve body (10), and / or a first seal (24) is provided between the valve stem (22) and the valve seat (23).

8. The drain valve according to claim 1, characterized in that, A sealing surface (18) is formed in the valve cavity (11) around the water inlet (13). A sealing protrusion (19) is provided on the sealing surface (18). A second sealing element (26) is provided on the valve core body (21). When the valve core body (21) closes the water inlet (13), the second sealing element (26) abuts against the sealing protrusion (19).

9. The drain valve according to claim 8, characterized in that, The valve core body (21) has a recessed mounting groove (213) at its end. The second seal (26) engages with the mounting groove (213) and at least part of the second seal (26) protrudes from the mounting groove (213). When the second seal (26) abuts against the sealing protrusion (19), the end of the valve core body (21) abuts against the sealing surface (18). And / or, along the moving direction of the valve core body (21), the thickness of the second seal (26) is D, and when the valve core body (21) closes the water inlet (13), the compression of the second seal (26) is 30%D to 40%D.

10. The drain valve according to any one of claims 1-9, characterized in that, The inlet (15) and the outlet (16) are located on adjacent sides of the valve body (10), the through outlet (13) and the outlet (16) are directly opposite each other, and the inlet (15) and the drain outlet (14) are located on opposite sides of the valve body (10). And / or, when the valve core body (21) opens the water inlet (13), the valve core body (21) moves in a straight line for a stroke of 3mm to 5mm.

11. A water heater, characterized in that, It includes an outer shell, an inner liner, and a drain valve as described in any one of claims 1-10, wherein the inner liner is disposed inside the outer shell, and the outlet (16) of the drain valve is connected to the inner liner.

Images