Internal relief valve core of safety valve, safety valve and water heater

Abstract

An internal relief valve core of a safety valve, a safety valve and a water heater. The internal relief valve core of the safety valve comprises a valve seat (10), a valve core (20), a first reset member (30) and a limiting member (40), wherein the valve seat (10) is provided with a pressure relief hole (11); the valve core (20) is movable along the axis of the pressure relief hole (11) to open and close the pressure relief hole (11); the first reset member (30) has an elastic force for driving the valve core (20) to close the pressure relief hole (11); and the limiting member (40) is configured to guide the valve core (20) to move along the axis of the pressure relief hole (11).

Description

Internal leakage valve core of safety valve, safety valve and water heater

[0001] Cross-references to related applications

[0002] This application claims priority to Chinese Patent Application No. 202423015122.6, filed on December 4, 2024, entitled "Internal Leakage Valve Core for Safety Valve, Safety Valve and Water Heater", the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of valve body technology, and in particular to an internal leakage valve core, a safety valve, and a water heater. Background Technology

[0004] Existing electric water heaters typically have a safety valve structure. During the heating process, as the pressure inside the water heater tank increases, when the internal leakage pressure opening value is reached, the internal leakage channel is opened. When the safety valve releases pressure, the valve core is easily subjected to fluid pressure, which can cause vibration and noise, affecting the user experience. Summary of the Invention

[0005] This application aims to at least partially solve one of the technical problems in the related art. Therefore, one objective of this application is to provide an internal leakage valve core for a safety valve.

[0006] Another objective of this application is to provide a safety valve, including the aforementioned internal leakage valve core.

[0007] Another object of this application is to provide a water heater that includes the aforementioned safety valve.

[0008] An internal relief valve core of a safety valve according to an embodiment of this application includes: a valve seat, a valve core, a first reset member, and a limiting member. The valve seat is provided with a pressure relief hole. The valve core is movable along the axis of the pressure relief hole to open and close the pressure relief hole. The first reset member has an elastic force to drive the valve core to close the pressure relief hole. The limiting member is configured to guide the valve core to move along the axis of the pressure relief hole.

[0009] According to the embodiments of this application, the internal leakage valve core of the safety valve can open and close the pressure relief hole of the valve seat. By setting a limiting member to guide the valve core to move along the axis of the pressure relief hole, the vibration of the valve core during the movement is reduced, thereby reducing the noise of the internal leakage valve core during the pressure relief process and improving the working stability of the safety valve.

[0010] In addition, the internal leakage valve core according to the above embodiments of this application may also have the following additional technical features:

[0011] In some embodiments, the limiting member is connected to the valve core and slidably engages with the valve seat along the axis of the pressure relief hole.

[0012] In some embodiments, the valve seat includes a cylinder extending along the axis of the pressure relief hole, the pressure relief hole being located inside one end of the cylinder, and the limiting member being axially movably inserted through the cylinder.

[0013] In some embodiments, the inner circumferential surface of the cylinder includes a first guide surface, and the outer circumferential surface of the limiting member includes a second guide surface. The second guide surface is movably disposed inside the first guide surface along the axis of the pressure relief hole.

[0014] Wherein, the first guide surface is a non-circular cylindrical surface, and the second guide surface is a non-circular cylindrical surface adapted to the first guide surface; or, the first guide surface is a polygonal cylindrical surface, and the second guide surface is a polygonal cylindrical surface adapted to the first guide surface; or, the gap between the first guide surface and the second guide surface is no greater than 1 mm; or, the first guide surface is located at the other end of the cylinder.

[0015] In some embodiments, the limiting member includes a positioning protrusion, which is disposed on the outer side of the cylinder and protrudes from the inner circumferential surface of the cylinder and is opposite to the other end of the cylinder along the axial direction of the pressure relief hole.

[0016] In some embodiments, the limiting member is threadedly connected to the valve core; and / or, the limiting member is clearance-fitted with the valve seat; and / or, the limiting member is keyedly connected to the valve seat.

[0017] In some embodiments, the limiting member is connected to the valve seat, and the valve core is slidably engaged with the limiting member along the axis of the pressure relief hole; or, the limiting member is disposed between the valve seat and the valve core, and the limiting member is slidably engaged with the valve seat and the valve core along the axis of the pressure relief hole.

[0018] In some embodiments, the valve core includes a valve stem and a valve plate, the valve plate being disposed to the side of the pressure relief hole, the valve stem being connected to the valve plate and passing through the pressure relief hole and the valve seat, and the limiting member cooperating with the valve stem and the valve seat to guide the movement of the valve core.

[0019] In some embodiments, the valve seat includes a cylinder and an end plate, the end plate covers one end of the cylinder, the pressure relief hole is disposed on the end plate, and the peripheral wall of the cylinder is provided with an internal leakage channel communicating with the internal space of the cylinder and the pressure relief hole.

[0020] In some embodiments, the valve core passes through the cylinder, and the limiting member is located at the other end of the cylinder and blocks at least a portion of the other end of the cylinder;

[0021] And / or, the peripheral wall of the cylinder is provided with a plurality of internal leakage channels.

[0022] A safety valve according to an embodiment of this application includes: a valve body, the aforementioned internal leakage valve core, and a second reset member. The valve body has an internal leakage cavity and a connection port and an internal leakage port communicating with the internal leakage cavity. The internal leakage valve core is disposed in the internal leakage cavity and is used to connect and disconnect the connection port and the internal leakage port. The second reset member has an elastic force to drive the internal leakage valve core to close the internal leakage port.

[0023] In some embodiments, the valve body is further provided with an external vent communicating with the internal vent cavity, and the safety valve further includes an external vent valve core configured to open and close the external vent.

[0024] A water heater according to an embodiment of this application includes: an inner tank and the aforementioned safety valve, wherein the inner tank has a water storage cavity and a water inlet communicating with the water storage cavity; the connection port is connected to the water inlet. Attached Figure Description

[0025] Figure 1 is a schematic diagram of the internal leakage valve core according to an embodiment of this application.

[0026] Figure 2 is a cross-sectional schematic diagram of the internal leakage valve core according to an embodiment of this application.

[0027] Figure 3 is an exploded schematic diagram of the internal leakage valve core according to an embodiment of this application.

[0028] Figure 4 is a schematic diagram of a safety valve according to an embodiment of this application.

[0029] Figure 5 is a schematic cross-sectional view of the safety valve according to an embodiment of this application.

[0030] Figure 6 is a cross-sectional schematic diagram of a safety valve in the related technology.

[0031] Reference numerals: Safety valve 1000, internal leakage valve core 100, valve seat 10, pressure relief hole 11, cylinder 12, first guide surface 121, internal leakage channel 122, end plate 13, valve core 20, valve stem 21, valve plate 22, first reset component 30, limiting component 40, second guide surface 41, positioning protrusion 42, buffer component 50, valve body 200, internal leakage cavity 210, connection port 220, internal leakage port 230, external leakage port 240, second reset component 300, external leakage valve core 400. Detailed Implementation

[0032] The embodiments of this application are described in detail below. Examples of these 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 application, and should not be construed as limiting this application.

[0033] In devices such as electric water heaters, heating the fluid in the system can cause the system pressure to rise. When the pressure in the system exceeds the safety limit, a safety valve needs to be installed to release the pressure in the system and protect the safety of the equipment.

[0034] Referring to Figures 1 and 2, the internal relief valve core 100 according to an embodiment of this application can be used in a safety valve. The internal relief valve core 100 includes a valve seat 10 and a valve core 20. The valve seat 10 is provided with a pressure relief hole 11. The valve core 20 is movable along the axis of the pressure relief hole 11 to open and close the pressure relief hole 11. When it is necessary to release the pressure in the system, the pressure relief hole 11 can be opened by the valve core 20 to release the pressure in the system and maintain the stable operation of the system. Referring to Figure 2, the axis of the pressure relief hole 11 is A.

[0035] Referring to Figure 2, the internal relief valve core 100 also includes a first reset member 30, which has an elastic force that drives the valve core 20 to close the pressure relief port 11. Specifically, when the system pressure does not exceed the safety value, that is, when the system pressure is normal, the first reset member 30 can drive the valve core 20 to close the pressure relief port 11, and the safety valve 1000 can be in a closed and sealed state to prevent the medium in the system from flowing out. When the system pressure exceeds the safety value, the system pressure overcomes the elastic force of the first reset member 30, driving the valve core 20 to open the pressure relief port 11. Exemplarily, the first reset member 30 can be a spring.

[0036] Referring to Figure 2, the internal relief valve core 100 also includes a limiting member 40. The limiting member 40 is configured to guide the valve core 20 to move along the axis of the pressure relief hole 11. The limiting member 40 can prevent the valve core 20 from swinging in the radial direction of the pressure relief hole 11 during movement, reduce the vibration of the valve core 20 during movement, thereby reducing the noise of the safety valve 1000 during the pressure relief process and improving the working stability of the safety valve 1000. Referring to Figure 2, the axis of the pressure relief hole 11 is A.

[0037] For example, the safety valve 1000 may be provided with an internal leakage channel. When the valve core 20 closes and opens the pressure relief hole 11, the fluid in the system flows at high speed in the internal leakage channel, which can easily generate discrete pressure waves in the internal leakage channel, causing the valve core 20 to vibrate and generate noise. By setting the limiting member 40 to guide the valve core 20 to move along the axial direction of the pressure relief hole 11, the noise caused by the vibration of the valve core 20 during the opening and closing of the pressure relief hole 11 can be reduced.

[0038] According to the internal leakage valve core 100 of the present application embodiment, the valve core 20 can open and close the pressure relief hole 11 of the valve seat 10. By setting the limiting member 40, the valve core 20 is guided to move along the axis of the pressure relief hole 11, thereby reducing the vibration of the valve core 20 during the movement, thereby reducing the noise of the internal leakage valve core 100 during the pressure relief process, and improving the working stability of the safety valve 1000.

[0039] The internal leakage valve core 100 of this application can be used in equipment that requires control of the internal pressure of pipelines or equipment, such as electric water heaters and air conditioning systems, to prevent excessive pressure from affecting the safe operation of the equipment. This application mainly uses water heaters as an example for illustration.

[0040] For example, the internal leakage valve core 100 can be used in an electric water heater, which may include an inner tank. When the water pressure in the inner tank is higher than the tap water pressure at the supply end and exceeds the pressure safety value, the water pressure in the inner tank can act on the valve core 20 and overcome the elastic force of the first reset member 30 to drive the valve core 20 to open the pressure relief hole 11, thereby releasing the pressure in the inner tank and improving the safety of the water heater. It is understood that at the moment when the valve core 20 opens and closes the pressure relief hole 11, there are discrete pressure waves in the internal leakage channel of the safety valve 1000, and the discrete internal leakage pressure and the elastic force of the first reset member 30 are a pair of interacting dynamic equilibrium forces, which can easily cause vibration during the movement of the valve core 20, causing the safety valve 1000 to generate noise. The internal leakage valve core 100 of this application guides the valve core 20 to move along the axial direction of the pressure relief hole 11 by setting a limiting member 40, thereby improving the movement stability of the valve core 20, preventing the valve core 20 from vibrating and causing noise when subjected to discrete pressure from the water flow, and improving the working stability of the safety valve 1000.

[0041] The limiting member 40 is configured to guide the valve core 20 to move along the axis A of the pressure relief hole 11. For example, the limiting member 40 can be connected to the valve core 20, and the limiting member 40 can slidably engage with the valve seat 10 along the axis of the pressure relief hole 11; or, the limiting member 40 can be connected to the valve seat 10, and the valve core 20 can slidably engage with the limiting member 40 along the axis of the pressure relief hole 11; or, the limiting member 40 is located between the valve seat 10 and the valve core 20, and the limiting member 40 can slidably engage with both the valve seat 10 and the valve core 20 along the axis of the pressure relief hole 11. By setting the limiting member 40 to guide the valve core 20 to move along the axial direction of the pressure relief hole 11, the radial oscillation of the valve core 20 along the pressure relief hole 11 is reduced, improving the movement stability of the valve core 20 and reducing the vibration of the valve core 20 during movement, thus reducing the noise of the safety valve 1000 during operation.

[0042] Referring to Figure 2, in some embodiments of this application, the limiting member 40 is connected to the valve core 20 and slidably engages with the valve seat 10 along the axis of the pressure relief hole 11. Specifically, the position of the valve seat 10 is relatively fixed. When the pressure value in the system exceeds the safety value, the pressure in the system acts on the valve core 20 and overcomes the elastic force of the first reset member 30, driving the valve core 20 to open the pressure relief hole 11. At the same time, it drives the limiting member 40 to move. The limiting member 40 engages with the valve seat 10, which facilitates the sliding of the limiting member 40 along the axial direction of the pressure relief hole 11, thereby stably limiting the sliding of the valve core 20 along the axial direction of the pressure relief hole 11. This simplifies the structure of the internal pressure relief valve core 100 and improves the movement stability of the valve core 20.

[0043] For example, a guide structure may be provided between the limiting member 40 and the valve core 20. The guide structure can guide the movement of the limiting member 40 so that the limiting member 40 can move along the axis of the pressure relief hole 11.

[0044] Referring to Figures 2 and 3, the valve seat 10 further includes a cylinder 12 extending along the axis of the pressure relief hole 11, which is located inside one end of the cylinder 12. The limiting member 40 is axially movable through the cylinder 12, allowing the cylinder 12 to be limited by the limiting member 40, thereby improving the stability of the limiting member 40 and stably driving the valve core 20 to move along the axis of the pressure relief hole 11, improving the reliability of the internal pressure relief valve core 100, and reducing the noise of the safety valve 1000 during the pressure relief process.

[0045] Referring to Figure 3, in some embodiments of this application, the inner circumferential surface of the cylinder 12 includes a first guide surface 121, and the outer circumferential surface of the limiting member 40 includes a second guide surface 41. The second guide surface 41 is movably disposed inside the first guide surface 121 along the axis of the pressure relief hole 11. The first guide surface 121 and the second guide surface 41 cooperate to guide the movement of the limiting member 40, improve the movement stability of the limiting member 40, and thus stably drive the valve core 20 to move along the axial direction of the pressure relief hole 11.

[0046] The first guide surface 121 and the second guide surface 41 can be configured with different structures.

[0047] In a first embodiment of this application, the first guide surface 121 is a non-circular cylindrical surface, and the second guide surface 41 is a non-circular cylindrical surface adapted to the first guide surface 121. Exemplarily, the cross-section of the cylinder 12 can be eccentrically circular, elliptical, etc., and the first guide surface 121 and the second guide surface 41 are non-cylindrical surfaces, facilitating the guidance of the limiting member 40 along the axial direction of the pressure relief hole 11 via the cylinder 12, thus preventing the limiting member 40 from swaying within the cylinder 12 when the valve core 20 is subjected to fluid pressure.

[0048] In a second embodiment of this utility model, the first guide surface 121 is a polygonal cylindrical surface, and the second guide surface 41 is a polygonal cylindrical surface adapted to the first guide surface 121. Exemplarily, the cross-section of the cylinder 12 can be triangular, quadrilateral, pentagonal, hexagonal, etc. The first guide surface 121 and the second guide surface 41 are polygonal cylindrical surfaces, which facilitates guiding the limiting member 40 to move along the axial direction through the cylinder 12, preventing the limiting member 40 from shaking inside the cylinder 12 when the valve core 20 is subjected to fluid pressure, and also improving the structural strength of the internal leakage valve core 100.

[0049] In some embodiments of this application, the gap between the first guide surface 121 and the second guide surface 41 is no more than 1 mm, so that the limiting member 40 can move axially relative to the cylinder 12, and avoids the gap between the first guide surface 121 and the second guide surface 41 being too large, so that when the fluid impacts the valve core 20, the limiting member 40 will shake inside the cylinder 12.

[0050] Referring to Figures 2 and 3, in some embodiments of this application, the first guide surface 121 is located at the other end of the cylinder 12, that is, the limiting member 40 is close to the other end of the cylinder 12. As mentioned above, the pressure relief hole 11 is located at one end of the cylinder 12, and the first guide surface 121 is located at the other end of the cylinder 12, facilitating the installation of the internal pressure relief valve core 100 and ensuring stable guidance of the valve core 20 along the axial direction of the pressure relief hole 11 via the limiting member 40, so that the valve core 20 can stably close and open the pressure relief hole 11.

[0051] For example, when installing the internal leakage valve core 100, the valve core 20 can be first installed from the lower end of the cylinder 12 onto the valve seat 10, and then the limiting member 40 can be connected to the valve core 20 from the upper end of the cylinder 12. The pressure relief hole 11 is located on the inner side of the lower end of the cylinder 12, which facilitates the closing and opening of the pressure relief hole 11 by the valve core 20. The first guide surface 121 is located at the upper end of the cylinder 12, which facilitates the cooperation between the second guide surface 41 of the limiting member 40 and the first guide surface 121 of the cylinder 12 to limit the movement of the valve core 20, improve the movement stability of the valve core 20, and reduce the noise generated by the valve core 20 under fluid impact vibration. The internal leakage valve core 100 of this embodiment has a simple structure, reliable structure, and is easy to install.

[0052] Referring to Figures 2 and 3, in some embodiments of this application, the limiting member 40 includes a positioning protrusion 42. The positioning protrusion 42 is located on the outer side of the cylinder 12, protrudes from the inner circumferential surface of the cylinder 12, and is opposite to the other end of the cylinder 12 along the axial direction of the pressure relief hole 11. The positioning protrusion 42 can limit the movement of the valve core 20, preventing the valve core 20 from disengaging from the valve seat 10 under system pressure, thereby improving the structural stability of the internal pressure relief valve core 100. Specifically, when the pressure in the system exceeds a safe value, the system pressure drives the valve core 20 to move and open the pressure relief hole 11. The positioning protrusion 42 can abut against the end face of the cylinder 12, which can limit the valve core 20 from continuing to move along the axial direction, preventing the valve core 20 from disengaging from the valve seat 10, and improving the structural stability of the internal pressure relief valve core 100.

[0053] In some embodiments of this application, the limiting member 40 is threadedly connected to the valve core 20, which facilitates the fixing of the limiting member 40 and the valve core 20, improves the connection stability between the limiting member 40 and the valve core 20, and facilitates the replacement of parts in the future.

[0054] In some embodiments of this application, the limiting member 40 is clearance-fitted with the valve seat 10, which facilitates the installation of the limiting member 40 and the valve seat 10, and makes it easy for the limiting member 40 to cooperate with the valve seat 10, so that the limiting member 40 can slide axially relative to the valve seat 10.

[0055] In some embodiments of this application, the limiting member 40 is keyed to the valve seat 10. Exemplarily, the limiting member 40 may have a flat key extending along the axial direction of the pressure relief hole 11, and the inner side of the valve seat 10 may have a keyway. The flat key is slidably disposed in the keyway, facilitating the guidance of the movement of the limiting member 40, improving the movement stability of the limiting member 40. By limiting the limiting member 40 through the valve seat 10, the limiting member 40 guides the valve core 20 to move stably along the axial direction of the pressure relief hole 11, preventing radial shaking of the valve core 20 when subjected to fluid impact, and reducing noise of the internal pressure relief valve core 100 during the pressure relief process.

[0056] In some other embodiments of this application, the limiting member 40 is connected to the valve seat 10, and the valve core 20 is slidably engaged with the limiting member 40 along the axis of the pressure relief hole 11. Specifically, the position of the valve seat 10 is relatively fixed, and the position of the limiting member 40 relative to the valve seat 10 is fixed. When the pressure value in the system exceeds the safety value, the pressure in the system acts on the valve core 20, and the limiting member 40 can guide the movement of the valve core 20, driving the valve core 20 to move along the axis A of the pressure relief hole 11 to open and close the pressure relief hole 11. This avoids the valve core 20 from swinging and generating noise under the action of fluid pressure, simplifies the structure of the internal relief valve core 100, and improves the movement stability of the valve core 20.

[0057] For example, the inner peripheral surface of the limiting member 40 may include a third guide surface, and the outer peripheral surface of the valve core 20 may include a fourth guide surface. The fourth guide surface is movably disposed inside the third guide surface along the axis of the pressure relief hole 11.

[0058] In some embodiments of this application, a limiting member 40 is disposed between the valve seat 10 and the valve core 20, and the limiting member 40 is slidably engaged with the valve seat 10 and the valve core 20 along the axis of the pressure relief hole 11. Specifically, when the pressure value in the system exceeds the safety value, the pressure in the system overcomes the elastic force of the first reset member 30 and acts on the valve core 20. The limiting member 40 can guide the movement of the valve core 20, driving the valve core 20 to move along the axial direction of the pressure relief hole 11 to open and close the pressure relief hole 11, preventing the valve core 20 from swinging under the action of fluid pressure, simplifying the structure of the internal vent valve core 100, and improving the movement stability of the valve core 20.

[0059] Referring to Figures 2 and 3, in some embodiments of this application, the valve core 20 includes a valve stem 21 and a valve plate 22. The valve plate 22 is disposed to the side of the pressure relief hole 11. The valve stem 21 is connected to the valve plate 22 and passes through the pressure relief hole 11 and the valve seat 10. The limiting member 40 cooperates with the valve stem 21 and the valve seat 10 to guide the movement of the valve core 20. Specifically, the valve stem 21 can drive the valve plate 22 to move, thereby closing and opening the pressure relief hole 11. The limiting member 40 cooperates with the valve stem 21 to guide the valve stem 21 to move along the axial direction of the pressure relief hole 11, so that the valve plate 22 can stably open and close the pressure relief hole 11. At the same time, the valve seat 10 cooperates with the limiting member 40 to ensure that the limiting member 40 can stably guide the movement of the valve stem 21.

[0060] Referring to Figure 6, the arrows indicate the direction of fluid pressure relief within the safety valve in the relevant art. The inlet of the internal relief channel is located at the top. When the fluid pressure in the system increases and reaches the internal relief pressure value, the internal relief fluid rushes straight through the internal relief channel at high speed, which can easily generate jet flow and cause noise.

[0061] Referring to Figures 2 and 3, in some embodiments of this application, the valve seat 10 includes a cylinder 12 and an end plate 13. The end plate 13 covers one end of the cylinder 12, and a pressure relief hole 11 is provided on the end plate 13. The peripheral wall of the cylinder 12 is provided with an internal leakage channel 122 that connects the internal space of the cylinder 12 and the pressure relief hole 11. After the valve core 20 opens the pressure relief hole 11, the system pressure can be discharged from the pressure relief hole 11 through the internal leakage channel 122. By providing the internal leakage channel 122 on the peripheral wall of the cylinder 12, the pressure relief flow direction of the fluid is optimized. By changing the inlet direction of the internal leakage fluid, the pressure and flow rate of the internal leakage water are relieved, and the flow-induced noise caused by the internal leakage discrete pressure is changed, further reducing the noise of the safety valve 1000 during the pressure relief process.

[0062] As shown in Figure 5, the arrows indicate the direction of fluid pressure relief. When the pressure in the system exceeds the safety value, the fluid can enter the internal relief channel 122 from the peripheral wall of the cylinder 12 to optimize the direction of fluid pressure relief. By changing the inlet direction of the internal relief fluid, the pressure and flow rate of the internal relief water are relieved, and the flow-induced noise caused by the internal relief discrete pressure is changed, further reducing the noise of the safety valve 1000 during the pressure relief process.

[0063] Referring to Figure 2, further, the valve core 20 passes through the cylinder 12, and the limiting member 40 is located at the other end of the cylinder 12, blocking at least a portion of the other end of the cylinder 12. For example, the valve core 20 can pass through the lower end of the cylinder 12, facilitating the closing and opening of the pressure relief hole 11. The limiting member 40 limits the valve core 20 from the upper end of the cylinder 12, facilitating the installation of the internal leakage valve core 100 and allowing the upper end of the cylinder 12 to be sealed by the limiting member 40, enabling the internal leakage fluid to enter the internal leakage channel 122 from the peripheral wall of the cylinder 12, thus optimizing the pressure relief flow direction of the fluid.

[0064] In some embodiments of this application, the peripheral wall of the cylinder 12 is provided with a plurality of internal leakage channels 122. When the pressure of the system exceeds the safety value, the pressure can be released from the plurality of internal leakage channels 122, thereby improving the pressure release efficiency of the internal leakage valve core 100.

[0065] In conjunction with the foregoing, optionally, referring to Figure 3, the valve seat 10 includes a cylinder 12 and an end plate 13, the valve core 20 includes a valve stem 21 and a valve plate 22, and the internal leakage valve core 100 also includes a buffer 50, which is connected between the end plate 13 and the valve plate 22. When the valve core 20 closes the pressure relief hole 11, it prevents the valve plate 22 from colliding with the end plate 13 and causing noise, and can reduce the wear between the valve plate 22 and the end plate 13.

[0066] In addition, in related technologies, a filter screen can be provided inside the safety valve 1000. During the axial movement of the valve core 20, the filter screen fixing member provides weak constraint on the valve core 20. When there is circumferential vibration during the movement of the valve core 20, the valve core 20 rod vibrates and collides with the filter screen fixing member, causing vibration noise. By setting the aforementioned internal leakage valve core 100, the valve core 20 is guided to move along the axial direction of the pressure relief hole 11 by the limiting member 40, which can prevent the valve core 20 from colliding with the filter screen fixing member during the movement and reduce the noise of the safety valve 1000 during the pressure relief process.

[0067] Referring to Figures 4 and 5, this utility model also provides a safety valve 1000, which includes a valve body 200 and the aforementioned internal leakage valve core 100. The valve body 200 has an internal leakage cavity 210 and a connection port 220 and an internal leakage port 230 communicating with the internal leakage cavity 210. The internal leakage valve core 100 is disposed in the internal leakage cavity 210 and is used to connect and disconnect the connection port 220 and the internal leakage port 230. For example, the connection port 220 can be connected to the inner tank of a water heater. When the pressure in the inner tank exceeds a safe value, the fluid pressure can drive the internal leakage valve core 100 to move, connecting the connection port 220 and the internal leakage port 230, facilitating the discharge of excess pressure from the inner tank through the internal leakage port 230, thus improving the safety of the inner tank. When pressure relief is not required, the internal leakage valve core 100 can disconnect the connection port 220 and the internal leakage port 230.

[0068] The safety valve 1000 also includes a second reset member 300, which has an elastic force that drives the internal leakage valve core 100 to close the internal leakage port 230. Specifically, when the system pressure does not exceed the safety value, that is, when the system pressure is normal, the second reset member 300 can drive the internal leakage valve core 100 to close the internal leakage port 230, and the safety valve 1000 can be in a closed and sealed state to prevent the medium in the system from flowing out. When the system pressure exceeds the safety value, the system pressure overcomes the elastic force of the second reset member 300, driving the internal leakage valve core 100 to open the internal leakage port 230 to release the system pressure through the internal leakage port 230. Exemplarily, the second reset member 300 can be a spring.

[0069] Furthermore, the valve body 200 is also provided with an external vent 240 communicating with the internal vent chamber 210. The safety valve 1000 also includes an external vent valve core 400, which is configured to open and close the external vent 240. When the external vent valve core 400 opens the external vent 240, the pressure in the system can be released to the outside of the system, improving the operational stability of the system. For example, the external vent 240 can be connected to a drain pipe, and when the system pressure exceeds the safe value, the excess pressure in the system can be discharged through the external vent 240.

[0070] This application also provides a water heater, including: an inner tank and the aforementioned safety valve 1000. The inner tank has a water storage chamber and a water inlet communicating with the water storage chamber, and a connection port 220 is connected to the water inlet. By setting the aforementioned safety valve 1000, the noise generated by the water heater during the pressure relief process can be reduced.

[0071] The various embodiments / implementations of this application can be combined with each other without creating contradictions.

[0072] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, 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, and therefore should not be construed as a limitation of this application.

[0073] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0074] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., 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, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0075] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0076] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0077] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. An internal leakage valve core for a safety valve, comprising: Valve seat, wherein the valve seat is provided with a pressure relief hole; A valve core, movable along the axis of the pressure relief orifice to open and close the pressure relief orifice; A first reset element has an elastic force that drives the valve core to close the pressure relief hole; A limiting element is configured to guide the valve core to move along the axis of the pressure relief hole.

2. The inner leak spool of claim 1, wherein, The limiting member is connected to the valve core and slidably engages with the valve seat along the axis of the pressure relief hole.

3. The inner leak spool of claim 2, wherein, The valve seat includes a cylinder that extends along the axis of the pressure relief hole, the pressure relief hole being located on the inner side of one end of the cylinder, and the limiting member being axially movable through the cylinder.

4. The inner leak spool of claim 3, wherein, The inner circumferential surface of the cylinder includes a first guide surface, and the outer circumferential surface of the limiting member includes a second guide surface. The second guide surface is movably disposed inside the first guide surface along the axis of the pressure relief hole. Wherein, the first guide surface is a non-circular cylindrical surface, and the second guide surface is a non-circular cylindrical surface adapted to the first guide surface; or, the first guide surface is a polygonal cylindrical surface, and the second guide surface is a polygonal cylindrical surface adapted to the first guide surface; or, the gap between the first guide surface and the second guide surface is no greater than 1 mm; or, the first guide surface is located at the other end of the cylinder.

5. The inner leak spool of claim 3 or 4, wherein, The limiting member includes a positioning protrusion, which is located on the outside of the cylinder and protrudes from the inner circumferential surface of the cylinder and is opposite to the other end of the cylinder along the axial direction of the pressure relief hole.

6. The inner leak spool of any of claims 2-5, wherein, The limiting member is threadedly connected to the valve core; and / or, the limiting member is clearance-fitted with the valve seat; and / or, the limiting member is keyedly connected to the valve seat.

7. The inner leak spool of any one of claims 1-6, wherein, The limiting member is connected to the valve seat, and the valve core is slidably engaged with the limiting member along the axis of the pressure relief hole; Alternatively, the limiting member is disposed between the valve seat and the valve core, and the limiting member is slidably engaged with the valve seat and the valve core along the axis of the pressure relief hole.

8. The inner leak spool of any one of claims 1-7, wherein, The valve core includes a valve stem and a valve plate. The valve plate is located to the side of the pressure relief hole. The valve stem is connected to the valve plate and passes through the pressure relief hole and the valve seat. The limiting member cooperates with the valve stem and the valve seat to guide the movement of the valve core.

9. The inner leak spool of any of claims 1-8, wherein, The valve seat includes a cylinder and an end plate. The end plate covers one end of the cylinder, and the pressure relief hole is located on the end plate. The peripheral wall of the cylinder is provided with an internal leakage channel that connects the internal space of the cylinder and the pressure relief hole.

10. The inner leak spool of claim 9, wherein, The valve core passes through the cylinder, and the limiting member is located at the other end of the cylinder and blocks at least a portion of the other end of the cylinder; And / or, the peripheral wall of the cylinder is provided with a plurality of internal leakage channels.

11. A safety valve, comprising: A valve body having an internal leakage cavity and a connection port and an internal leakage port communicating with the internal leakage cavity; The internal leakage valve core according to any one of claims 1-10, wherein the internal leakage valve core is disposed in the internal leakage cavity and is used to connect and disconnect the connection port and the internal leakage port; The second reset element has an elastic force that drives the internal leakage valve core to close the internal leakage port.

12. The safety valve according to claim 11, wherein, The valve body is also provided with an external discharge port that communicates with the internal discharge cavity, and the safety valve also includes an external discharge valve core, which is configured to open and close the external discharge port.

13. A water heater, comprising: The inner liner has a water storage cavity and a water inlet communicating with the water storage cavity; The safety valve according to any one of claims 11-12, wherein the connection port is connected to the water inlet.

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