Plug valve and gas appliance

Abstract

The invention discloses a plug valve and a gas appliance. The plug valve comprises a valve body, a valve rod, a sealing piece and a flameout protection assembly. The valve body is provided with a valve port, and the valve rod can push the sealing piece to be away from the valve port. The flameout protection assembly comprises a first thermal bimetallic strip, the first thermal bimetallic strip is provided with a first end and a second end, the first end is connected with the valve body, and the second end is connected with the sealing piece; the first thermal bimetallic strip can drive the sealing piece to be far away from the valve port when being heated to bend and deform, and the first thermal bimetallic strip can drive the sealing piece to be close to and close the valve port when being cooled to reset. When the plug valve is applied, the first thermal bimetallic strip is matched with the sealing piece, so that gas circulation can be kept during working, gas is cut off for flameout protection when flames are extinguished, and the plug valve is simple in structure.

Description

Technical Field

[0001] This application relates to the field of gas control technology, and in particular to a plug valve and a gas appliance. Background Technology

[0002] A stopcock valve is a core component of gas appliances, used for ignition, flame control, and flameout. To prevent gas leakage in case of accidental flameout, a flameout protection device is often installed on the stopcock valve.

[0003] Flameout protection devices mainly come in two types: thermocouple type and ionization type. Thermocouple type devices typically consist of a thermocouple and a solenoid valve. The solenoid valve is installed inside a stopcock to control the opening and closing of the gas passage, while the thermocouple is placed near the burner of the gas appliance. After the gas appliance is ignited, the open flame transfers heat to the thermocouple, which in turn powers the solenoid valve to open the gas passage, allowing gas to flow. After the flame extinguishes, the temperature sensed by the thermocouple decreases, the current decreases, and the solenoid valve closes the gas passage, cutting off the gas supply and achieving flameout protection. Ionization type devices differ from thermocouple type devices by replacing the thermocouple with two ionization needles and adding a battery. Based on the principle of open flame conductivity, the open flame conducts current through the two ionization needles, and the battery provides current to maintain the suction force of the solenoid valve, keeping gas flowing. After the flame extinguishes, the two ionization needles disconnect, the current disappears, the solenoid valve closes the gas passage, cutting off the gas supply and providing flameout protection. While both of these flameout protection components can achieve flameout protection for gas appliances, they both require the installation of solenoid valves and thermocouples or ionizing needles, making their structures complex.

[0004] Therefore, how to provide a solution to address or mitigate the aforementioned deficiencies remains a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] The purpose of this application is to provide a plug valve that can maintain gas flow during operation and cut off the gas supply for flameout protection when the flame is extinguished, with a relatively simple structure. Another purpose of this application is to provide a gas appliance.

[0006] To address the aforementioned technical problems, this application provides a plug valve, comprising a valve body, a valve stem, a seal, and a flameout protection assembly; the valve body has a valve port, and the valve stem is capable of pushing the seal away from the valve port; the flameout protection assembly includes a first thermo-bimetallic strip, which has a first end and a second end, the first end being connected to the valve body and the second end being connected to the seal; when the first thermo-bimetallic strip is heated and bent, it can drive the seal away from the valve port, and when the first thermo-bimetallic strip cools and resets, it can drive the seal closer to and close the valve port.

[0007] The plug valve provided in this application includes a valve body, a valve stem, a seal, and a flameout protection assembly. The valve body has a valve port, and the valve stem can push the seal away from the valve port. The flameout protection assembly includes a first thermal bimetallic strip, with a first end connected to the valve body and a second end connected to the seal. When the first thermal bimetallic strip is heated and bent, it can drive the seal away from the valve port. When the first thermal bimetallic strip cools and resets, it can drive the seal closer to and close the valve port.

[0008] During operation, the valve stem pushes the seal away from the valve port, allowing gas to flow. After the gas is ignited, the first hot bimetallic strip is heated by the open flame, causing it to bend and deform. This forces the seal away from the valve port, maintaining its position and ensuring gas flow. When the flame goes out, the temperature of the first hot bimetallic strip gradually decreases, allowing the bending deformation to gradually recover. This causes the seal to move closer to and close the valve port, cutting off the gas flow and preventing leakage.

[0009] In this way, by utilizing the combination of the first hot bimetallic strip and the seal, the gas flow can be maintained during operation, and the gas supply can be cut off for flameout protection when the flame is extinguished. The structure is relatively simple. Attached Figure Description

[0010] Figure 1 A three-dimensional structural schematic diagram of the plug valve provided in the embodiments of this application;

[0011] Figure 2 for Figure 1 Side view of a center-turn plug valve;

[0012] Figure 3 This is an axial sectional view of the plug valve provided in the embodiments of this application;

[0013] Figure 4 This is an axial sectional view of the valve body in the plug valve provided in the embodiment of this application;

[0014] Figure 5 This is a three-dimensional structural diagram of the flameout protection component in the plug valve provided in the embodiments of this application;

[0015] Figure 6 for Figure 5 Front view of the flameout protection assembly;

[0016] Figure 7 This is an exploded structural diagram of the plug valve provided in the embodiments of this application;

[0017] Figure 8 for Figure 3 A magnified view of the central rotary stop valve at point F;

[0018] Figure 9 for Figure 2A magnified view of the central rotary stop valve at point A;

[0019] Figure 10 for Figure 5 A magnified view of the second hot bimetallic strip at point G;

[0020] Figure 11 for Figure 3 A magnified view of the central plug valve at point D;

[0021] Figure 12 for Figure 4 A magnified view of the valve body at point C;

[0022] Figure 13 for Figure 2 A magnified view of the central rotary stop valve at point B;

[0023] Figure 14 for Figure 3 A magnified view of the central plug valve at point E.

[0024] The reference numerals in the above figures are explained as follows:

[0025] 1-Valve body, 11-First valve chamber, 12-Second valve chamber, 13-Inlet passage, 14-Outlet passage, 15-Valve port, 151-Valve port, 152-First sealing surface, 16-Connecting passage, 17-Annular protrusion, 18-Sealing groove, 181-First stepped hole, 182-Second stepped hole, 183-Inner hole;

[0026] 2-Valve stem;

[0027] 3-Valve core, 31-Ventilation chamber, 32-Flame hole;

[0028] 4-Emperor pin;

[0029] 5-Flameout protection assembly, 51-First thermal bimetallic strip, 511-First active layer, 512-First passive layer, 513-Second mounting hole, 52-Second thermal bimetallic strip, 521-Second active layer, 522-Second passive layer, 523-First mounting hole;

[0030] 6-Seal, 61-Push rod, 611-Boss, 62-Sealing block, 621-Second sealing surface, 622-Concave hole;

[0031] 71-First mating part, 72-Second mating part, 73-First limiting part, 74-Second limiting part;

[0032] 8-Fixed rod;

[0033] 9-Sealing assembly, 91-Mounting block, 911-Mounting groove, 92-Sealing gasket, 93-Sealing ring. Detailed Implementation

[0034] To enable those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] In the description of this application, it should be specifically noted that the terms "up" and "down" used in this application refer to directions that are... Figure 1 From a perspective perspective, the vertical direction is also the valve's axial direction; please refer to [reference needed]. Figures 1 to 14 The direction indicated by the middle arrow shows that the sealing block 62 moves upward towards the valve port 151 and downward away from the valve port 151. It is understood that the plug valve of this application can be installed vertically, horizontally, or at an angle, depending on the application scenario. Figures 1 to 14 The perspective and the terms "upper" and "lower" are used only for the convenience of describing this application and simplifying the description, and are not intended to 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.

[0036] The terms "first" and "second" used in this application are merely for the convenience of describing two or more structures or components that are identical or similar in structure and / or function, and do not imply any special limitation on their order and / or importance.

[0037] In this application, unless otherwise expressly specified and limited, the term "connection" should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral connection; it can refer to a direct connection, an indirect connection through an intermediate medium, or a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0038] In this application, the thermal bimetallic sheet is a thermosensitive functional material in which at least two metal or alloy component layers with different coefficients of thermal expansion are firmly bonded together. It can bend and deform with temperature changes and recover its deformation with temperature recovery. The term "thermal bimetallic sheet" is a general technical term or industry slang. The word "bimetallic" in this term does not limit the number of component layers of the thermal bimetallic sheet to only two. That is, the thermal bimetallic sheet can have two component layers, three component layers, four component layers, or more component layers.

[0039] Specifically, when a bimetallic strip has two component layers, the layer with the larger coefficient of thermal expansion is the active layer, and the layer with the smaller coefficient of thermal expansion is the passive layer. When a bimetallic strip has three or more component layers, the outermost two component layers, with the one with the larger coefficient of thermal expansion, are the active layer, and the one with the smaller coefficient of thermal expansion is the passive layer. The component layer between the active and passive layers is the intermediate layer, which is typically used to adjust the resistivity of the bimetallic strip. In practical use, for example, when the temperature rises above a preset temperature threshold, each component layer of the bimetallic strip will deform, with the deformation of the active layer being greater than that of the passive layer, causing the entire bimetallic strip to bend towards the passive layer. When the temperature gradually decreases below the preset temperature threshold, the bimetallic strip gradually recovers its deformation until it returns to its original shape.

[0040] To address the technical problem of complex structures in existing plug valves that employ both thermocouple and ionization-based flameout protection methods, this application provides a plug valve primarily used in gas appliances. Because it has a gas passage, it can supply gas to the igniter of the gas appliance for ignition, flame adjustment, and flameout operations. Furthermore, it can achieve, with a simple structure, maintaining gas flow during operation and cutting off gas supply for flameout protection when the flame is extinguished.

[0041] Please refer to Figures 1 to 3 , Figure 1 This is a three-dimensional structural diagram of the plug valve provided in the embodiments of this application. Figure 2 for Figure 1 Side view of a center-turn plug valve. Figure 3 This is an axial cross-sectional view of the plug valve provided in the embodiments of this application.

[0042] In the embodiments provided in this application, please refer to Figure 1 Understood, the plug valve includes a valve body 1, a valve stem 2, a seal 6, and a flameout protection assembly 5. Please refer to [reference needed]. Figure 3 The valve body 1 has a valve port 151, and the valve stem 2 can push the seal 6 away from the valve port 151. Please refer to... Figures 1-3 The flameout protection assembly 5 includes a first thermal bimetallic strip 51, which has a first end and a second end. The first end is connected to the valve body 1, and the second end is connected to the seal 6. When the first thermal bimetallic strip 51 is heated and bent, it can move the seal 6 away from the valve port 151. When the first thermal bimetallic strip 51 cools and resets, it can move the seal 6 closer to and close the valve port 151.

[0043] As mentioned earlier, it is easy to understand that the number of component layers in the first bimetallic strip 51 is not limited. In this embodiment, the first bimetallic strip 51 may have two component layers, specifically a first active layer 511 and a first passive layer 512, which has a simple structure and low cost. The coefficient of thermal expansion of the first active layer 511 is greater than that of the first passive layer 512, and the first passive layer 512 may be located below the first active layer 511. Thus, when the first bimetallic strip 51 is heated, both the first active layer 511 and the first passive layer 512 can deform. The deformation of the first active layer 511 can be greater than that of the first passive layer 512, allowing the first bimetallic strip 51 to bend towards the first passive layer 512, thereby causing the seal 6 to move downwards away from the valve port 151. When the temperature of the first bimetallic strip 51 decreases, the deformation gradually recovers, allowing the first bimetallic strip 51 to cause the seal 6 to move upwards, approaching and closing the valve port 151. It can be seen that by utilizing the difference in thermal expansion coefficients between the first active layer 511 and the first passive layer 512, the first thermal bimetallic strip 51 drives the sealing element 6 to move axially in the plug valve.

[0044] It is worth noting that, please combine Figure 3 Understanding is that the first end of the first hot bimetallic strip 51 is the end relatively far from the seal 6, specifically... Figure 3 The right end, the second end is the end relatively close to the seal 6, specifically as follows: Figure 3 The left end of the first hot bimetallic strip 51; the connection between the first end and the valve body 1, and the connection between the second end and the seal 6, can be either a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of "connection" in this application based on the specific circumstances.

[0045] Please refer to this as well. Figure 4 , Figure 4 This is an axial sectional view of the valve body in the plug valve provided in the embodiment of this application.

[0046] like Figure 3 and Figure 4As shown, the plug valve may further include a valve core 3 and a pin 4. The valve body 1 may have a first valve chamber 11 and a second valve chamber 12, and may also have an air inlet channel 13, an air outlet channel 14, and a connecting channel 16. The valve core 3 may have a venting chamber 31 and a flame port 32. The valve body 1 has a valve port 15, which has the aforementioned valve port 151. The valve core 3 is at least partially located in the first valve chamber 11. The valve stem 2 can be connected to the valve core 3, for example, by a pin. The pin 4 is at least partially located in the venting chamber 31 and can be connected to the valve stem 2. A spring can be fitted onto the pin 4. The air inlet channel 13 can communicate with the second valve chamber 12 through the connecting channel 16. The second valve chamber 12 and the first valve chamber 11 can communicate through the valve port 151. The venting chamber 31 and the first valve chamber 11 can communicate. The flame port 32 and the venting chamber 31 can communicate. The seal 6 and the valve port 151 are relatively... The position and the relative position of the burner 32 and the gas outlet 14 determine the gas flow state. Specifically, pressing down on the valve stem 2 can push the seal 6 away from the valve port 151 to open the valve port 151. On this basis, rotating the valve stem 2 can drive the valve core 3 to rotate, thereby controlling the connection between the burner 32 and the gas outlet 14, so that the gas flows. The gas flow rate can be controlled by controlling the size of the connection area. Conversely, when the valve port 151 is closed or the burner 32 and the gas outlet 14 are not connected, the gas does not flow.

[0047] Please refer to Figure 3 In the initial state, the seal 6 abuts against the valve port 15, the valve port 151 is closed, the second valve chamber 12 is not connected to the first valve chamber 11, and the gas does not flow.

[0048] When igniting a gas appliance, press down and rotate valve stem 2. Valve stem 2 moves pin 4 downward until pin 4 enters valve port 151, pushing seal 6 away from valve port 15, opening valve port 151. Valve stem 2 also rotates valve core 3, connecting flame hole 32 with gas outlet channel 14. At this time, gas enters second valve chamber 12 from inlet channel 13 via connecting channel 16, then enters first valve chamber 11 from second valve chamber 12 via valve port 151, then enters ventilation chamber 31 from first valve chamber 11, and finally enters gas outlet channel 14 from ventilation chamber 31 via flame hole 32 and is ejected from nozzle, allowing gas flow. Rotating valve stem 2 controls the rotation angle of valve core 3, thereby controlling the area of ​​the connection between flame hole 32 and gas outlet channel 14, and thus controlling the gas flow rate.

[0049] After the gas is ignited, the open flame can transfer heat to the first bimetallic strip 51. When heated, the first bimetallic strip 51 generates internal stress due to the difference in thermal expansion coefficients between the first active layer 511 and the first passive layer 512. Under this internal stress, the first bimetallic strip 51 can bend and deform towards the first passive layer 512. The first end of the first bimetallic strip 51 can be fixedly connected to the valve body 1 to become a fixed end, and the second end of the first bimetallic strip 51 is connected to the sealing element 6 to become a free end. Therefore, the displacement caused by bending deformation will be reflected in the free end, causing the sealing element 6 to move downwards away from the valve port 15, keeping the gas flowing. Thus, the flame continuously transfers heat to the first bimetallic strip 51, and the stopcock remains open.

[0050] When the stopcock valve is closed or the flame is extinguished due to an accident, the temperature of the first hot bimetallic strip 51 gradually decreases to the preset temperature threshold, the aforementioned internal stress gradually disappears, the bending deformation of the first hot bimetallic strip 51 gradually recovers, and the first hot bimetallic strip 51 can drive the sealing element 6 to move upward until it returns to the initial position and re-abuts the valve port 15, the valve port 151 is closed, the gas is cut off, so that the gas is not easy to leak after the flame is extinguished, thus making it less likely to cause a safety accident and realizing flameout protection.

[0051] As can be seen, the plug valve provided in this embodiment only has a first bimetallic strip 51. Utilizing the thermal sensitivity of the first bimetallic strip 51 and the cooperation between the first bimetallic strip 51 and the seal 6, it can maintain gas flow during operation and cut off the gas supply for flameout protection when the flame is extinguished. Compared to plug valves using thermocouple-type flameout protection components, which require both a solenoid valve and a thermocouple, and plug valves using ionization-type flameout protection components, which require both a solenoid valve, two ionization needles, and a battery, this embodiment eliminates the need for an electronic control structure, using a purely mechanical control structure. This simplifies the structure and makes installation easier. Furthermore, it eliminates the need for costly components such as solenoid valves or solenoid valves and batteries, using the lower-cost first bimetallic strip 51 reduces manufacturing costs. It is also easy to manufacture, has a simple processing technology, and is not easily damaged. In addition, for plug valves of different specifications, only the first bimetallic strip 51 and the seal 6 need to be easily disassembled and replaced, making it more versatile and easier to inspect and maintain.

[0052] Please refer to this as well. Figure 5 , Figure 5 This is a three-dimensional structural diagram of the flameout protection component in the plug valve provided in the embodiments of this application. Figure 6 for Figure 5 Front view of the flameout protection component.

[0053] In the embodiments provided in this application, please refer to Figure 3 , Figure 5and Figure 6 Understanding that the flameout protection assembly 5 also includes a second thermal bimetallic strip 52, which has a third end and a fourth end. The third end is connected to the second end of the first thermal bimetallic strip 51, and the fourth end is connected to the seal 6. Thus, the second thermal bimetallic strip 52 acts as an intermediate medium, indirectly connecting the second end of the first thermal bimetallic strip 51 and the seal 6. In this case, the second end of the first thermal bimetallic strip 51 and the third end of the second thermal bimetallic strip 52 are equivalent to intermediate connecting ends, and the fourth end of the second thermal bimetallic strip 52 becomes a free end. The direction of the thermal bending deformation of the second thermal bimetallic strip 52 is opposite to the direction of the thermal bending deformation of the first thermal bimetallic strip 51; the third end of the second thermal bimetallic strip 52 is the end relatively far from the seal 6, specifically... Figure 3 The right end, the fourth end is the end relatively close to the seal 6, specifically as follows: Figure 3 The left end of the middle.

[0054] It is understood that the number of component layers in the second thermal bimetallic strip 52 is not limited. In this embodiment, the second thermal bimetallic strip 52 may have two component layers, specifically the two component layers are... Figure 5 The second active layer 521 and the second passive layer 522 in the bimetallic strip 52 have a simple structure and low cost. The coefficient of thermal expansion of the second active layer 521 is greater than that of the second passive layer 522. The relative positions of the active and passive layers in the second bimetallic strip 52 are opposite to those in the first bimetallic strip 51. Specifically, the second active layer 521 can be located below the second passive layer 522. Thus, when the second bimetallic strip 52 is heated, both the second active layer 521 and the second passive layer 522 can deform. The deformation of the second active layer 521 can be greater than that of the second passive layer 522, allowing the entire second bimetallic strip 52 to bend towards the second passive layer 522, thereby causing the seal 6 to move upwards.

[0055] When the valve is closed, the temperature of the first bimetallic strip 51 changes with the ambient temperature. This change may cause the first bimetallic strip 51 to bend and deform towards the first passive layer 512, which may cause the seal 6 to displace downward. If the second bimetallic strip 52 is provided, when the temperature of the second bimetallic strip 52 changes with the ambient temperature, it may bend and deform towards the second passive layer 522, which may cause the seal 6 to displace upward. This upward displacement can limit the downward displacement, thereby limiting the seal 6 from moving away from the valve port 15, and relatively ensuring the sealing effect of the seal 6 on the valve port 15.

[0056] Moreover, in the open state, the igniter of the gas appliance can be positioned closer to the first bimetallic strip 51. The first bimetallic strip 51 receives heat from the open flame, which is transferred to the second bimetallic strip 52 through the connection between the second end of the first bimetallic strip 51 and the third end of the second bimetallic strip 52. Although both the first bimetallic strip 51 and the second bimetallic strip 52 will bend and deform, the temperature change of the first bimetallic strip 51 is obviously greater, and the bending deformation can be greater, allowing the free end of the entire flameout protection assembly 5 to move downward. The downward movement of the free end is similar to an arc motion with the fixed end as the center and the length of the flameout protection component 5 as the radius. When the movement angle is constant, the longer the radius, the longer the arc length, and the greater the valve opening displacement of the seal 6. The setting of the second hot bimetallic strip 52 can extend the radius of the arc motion, so that a smaller angle can obtain a larger valve opening displacement. The movement angle of the arc motion is positively correlated with the temperature change. Therefore, a smaller temperature change can produce a larger valve opening displacement, improving the valve opening effect of the flameout protection component 5.

[0057] In fact, the third end of the second hot bimetallic strip 52 may not be connected to the second end of the first hot bimetallic strip 51, but may be connected to the valve body 1. Correspondingly, the second end of the first hot bimetallic strip 51 may be directly connected to the sealing element 6. In this way, the sealing effect can also be guaranteed in the above-mentioned closed valve state. No specific restrictions are imposed.

[0058] It is worth noting that under the same temperature change, the displacement of the bimetallic strip is inversely proportional to its thickness and directly proportional to its length. Therefore, the relative lengths or thicknesses of the first bimetallic strip 51 and the second bimetallic strip 52 can be controlled so that the displacement generated by the bending deformation of the second bimetallic strip 52 in the closed state is greater than the displacement generated by the bending deformation of the first bimetallic strip 51. For example, the length of the second bimetallic strip 52 can be greater than the length of the first bimetallic strip 51, and the thickness of the second bimetallic strip 52 can be less than the thickness of the first bimetallic strip 51. This makes the second bimetallic strip 52 more easily deformable than the first bimetallic strip 51, so that the sealing effect of the plug valve is mainly reflected in the upward bending deformation generated by the second bimetallic strip 52, further ensuring the sealing effect of the plug valve in the closed state. Of course, only one of the above relative lengths and relative thicknesses can be limited; no specific limitation is imposed.

[0059] Understandably, the displacement of the bimetallic strip is positively correlated with its temperature change within a certain range, and the temperature change of the bimetallic strip in the open state is related to the heat transferred to the bimetallic strip. Therefore, by controlling the burner that generates the open flame to be closer to the first bimetallic strip 51 and further away from the second bimetallic strip 52, for example, closer to the first end of the first bimetallic strip 51, the heat transferred from the open flame to the first bimetallic strip 51 in the valve-opening state can be controlled to be greater than the heat transferred from the open flame to the second bimetallic strip 52. Furthermore, by reducing the contact area between the second end of the first bimetallic strip 51 and the third end of the second bimetallic strip 52, the heat transfer from the first bimetallic strip 51 to the second bimetallic strip 52 can be reduced. In this way, the heat received by the first bimetallic strip 51 in the valve-opening state is greater than the heat received by the second bimetallic strip 52, resulting in a greater displacement caused by the bending deformation of the first bimetallic strip 51 than that caused by the bending deformation of the second bimetallic strip 52. The valve-opening effect of the plug valve is mainly reflected in the downward bending deformation of the first bimetallic strip 51, further ensuring the valve-opening effect.

[0060] Furthermore, the displacement of the bimetallic strip is also related to the material of its constituent layers. In the embodiments provided in this application, the second active layer 521 of the second bimetallic strip 52 and the first active layer 511 of the first bimetallic strip 51 can be made of the same material, and the second passive layer 522 of the second bimetallic strip 52 and the first passive layer 512 of the first bimetallic strip 51 can be made of the same material. This facilitates controlling the sealing effect in the closed state by controlling the length or thickness of the second bimetallic strip 52 relative to the first bimetallic strip 51, and also facilitates controlling the temperature of the first bimetallic strip 51 and the second bimetallic strip 52 by controlling the distance between the igniter of the gas appliance and the first bimetallic strip 51 and the second bimetallic strip 52, or the contact area between the first bimetallic strip 51 and the second bimetallic strip 52, thereby controlling the valve opening effect in the open state.

[0061] In specific configurations, the materials of the active and passive layers of the first bimetallic strip 51 and the second bimetallic strip 52 are not limited.

[0062] Taking the first bimetallic strip 51 as an example, the material of the first active layer 511 requires a relatively large coefficient of thermal expansion, a high melting point, and stable microstructure, while its elastic modulus can be similar to that of the first passive layer 512. It can be a high-expansion alloy such as nickel-chromium-iron, manganese-copper-nickel, copper-tin-zinc, copper-zinc alloy, or alloy steel, specifically Mn72Cu18Ni10, Ni22Cr3, Ni20Mn6, Ni18Cr11, Ni19Cr2, or Ni25Cr8. The material of the first passive layer 512 requires a relatively small coefficient of thermal expansion and can be a low-expansion alloy or a constant-expansion alloy such as nickel-iron alloy, specifically Ni36Fe, Ni39Fe, Ni40Fe, Ni42Fe, Ni45Fe, or Ni50Fe. When an intermediate layer is provided, its material can be pure nickel, pure copper (red copper, oxygen-free copper), zirconium copper, etc.

[0063] Please refer to this as well. Figure 7 and Figure 8 , Figure 7 This is an exploded view of the plug valve provided in the embodiments of this application. Figure 8 for Figure 3 A magnified view of the middle rotary valve at point F.

[0064] In actual installation, the seal 6 can be block-shaped, rod-shaped, or other shapes. Figure 3 and Figure 7 The shape of the push rod 61 and the sealing block 62 shown is not specifically limited.

[0065] In the embodiments provided in this application, please refer to Figure 3 and Figure 7 It is understood that the seal 6 may include a push rod 61 and a sealing block 62, with the sealing block 62 located at the end of the push rod 61 near the valve port 151. Figure 3 The upper part is in the middle. The sealing block 62 can approach or move away from the valve port 15, thereby closing or opening the valve port 151. The end of the push rod 61 that is away from the valve port 151... Figure 3 The lower part of the push rod 61 extends out of the valve body 1 and connects to the fourth end of the second bimetallic strip 52. Of course, when the second bimetallic strip 52 is not provided or when the second bimetallic strip 52 is provided but the third end of the second bimetallic strip 52 is not connected to the second end of the first bimetallic strip 51, the lower part of the push rod 61 is connected to the second end of the first bimetallic strip 51.

[0066] like Figure 8As shown, the lower end of the valve port 15 forms a first sealing surface 152, and the upper end of the sealing block 62 forms a second sealing surface 621. The second sealing surface 621 can abut against or move away from the first sealing surface 152 to close or open the valve port 151. It can be understood that the valve stem 2 can push the sealing block 62 downwards, causing the sealing block 62 to move away from the valve port 15 until the second sealing surface 621 moves away from the first sealing surface 152, thus opening the valve port 151. When the first hot bimetallic strip 51 is heated and bent, it can drive the sealing block 62 axially downwards via the push rod 61, causing the second sealing surface 621 to move away from the first sealing surface 152, thus opening the valve port 151. When the first hot bimetallic strip 51 cools and resets, it can drive the sealing block 62 axially upwards via the push rod 61, causing the second sealing surface 621 to approach and abut against the first sealing surface 152, thus closing the valve port 151.

[0067] With this configuration, the sealing block 62 in the sealing element 6 can be used to seal the valve port 15, and the push rod 61 can be used to install the flameout protection component 5 and transmit the displacement of the flameout protection component 5 to the sealing block 62. This not only simplifies the structure but also helps to improve the sealing and opening effects of the plug valve.

[0068] In actual installation, the connection method between push rod 61 and sealing block 62 is not limited. For example, they can be integrally formed, or they can be... Figure 7 The modular design shown allows for welding, bonding, and other methods. Figure 8 As shown, it is engaged by the boss 611 and the recess 622.

[0069] In the embodiments provided in this application, please refer to Figure 8 It is understood that the upper part of the push rod 61 has a boss 611, and the sealing block 62 has a recess 622. The sealing block 62 is fitted onto the boss 611 so that the boss 611 is confined within the recess 622. This arrangement not only achieves a stable connection between the push rod 61 and the sealing block 62, but also facilitates installation and disassembly.

[0070] Understandably, the specific structure of the boss 611 and the recess 622 is not limited, as long as the boss 611 can be confined within the recess 622. For an example, please refer to... Figure 8 The boss 611 can be an annular boss set on the outer peripheral wall of the push rod 61. In this way, the upper part of the push rod 61 and the boss 611 together have a T-shaped axial section. The concave hole 622 can also be set to have a T-shaped axial section, so that the push rod 61 and the sealing block 62 can limit each other, and the connection structure is more stable. When the boss 611 moves downward, it can drive the sealing block 62 to move downward stably. When the boss 611 moves upward, it can press the sealing block 62 stably on the valve port 15, so as to achieve stable sealing of the plug valve.

[0071] In specific configurations, the push rod 61 can be prismatic, cylindrical, or other shapes; this application does not impose any limitations on this. In the embodiments provided in this application, the push rod 61 is cylindrical, which facilitates installation and sealing on the valve body 1, as well as connection with the sealing block 62 and the flameout protection assembly 5, and also facilitates smooth up-and-down movement.

[0072] In actual installation, push rod 61 can be made of metal and sealing block 62 can be made of elastic material to achieve a better sealing effect. Of course, the material composition of sealing element 6 is not limited to this. For example, it can also be made of metal, plastic or elastic material.

[0073] In actual setup, there are no restrictions on the connection method between the flameout protection component 5 and the push rod 61.

[0074] Please refer to this as well. Figure 9 and Figure 10 , Figure 9 for Figure 2 A magnified view of the center-turn plug valve at point A. Figure 10 for Figure 5 A magnified view of the second hot bimetallic strip at point G.

[0075] In the embodiments provided in this application, such as Figure 9 As shown, the plug valve also includes a first mating component 71 and a second mating component 72. Both the first mating component 71 and the second mating component 72 are located on the outer peripheral wall of the push rod 61. The second mating component 72 is located on the side of the first mating component 71 closest to the valve port 151. A second bimetallic strip 52 is movably sleeved on the push rod 61 and located between the first mating component 71 and the second mating component 72. In the closed state, the second bimetallic strip 52 abuts against the second mating component 72. This configuration allows for the smooth operation of opening and closing the valve through the interaction between the second bimetallic strip 52 and the first mating component 71, and between the second bimetallic strip 52 and the second mating component 72.

[0076] Specifically, when the valve stem 2 pushes the sealing block 62 downward, the second mating member 72 can transmit the thrust to the fourth end of the second hot bimetallic strip 52, thereby causing the fourth end to move downward; when the first hot bimetallic strip 51 is bent and deformed by heat, causing the fourth end of the second hot bimetallic strip 52 to displace downward, it can drive the push rod 61 and the sealing block 62 to move downward by acting on the first mating member 71; during the cooling and reset process of the first hot bimetallic strip 51, it can drive the push rod 61 and the sealing block 62 to reset by acting on the second mating member 72.

[0077] In actual setup, the specific form of the first mating part 71 and the second mating part 72 is not limited, as long as they can be used to transmit the thrust of the valve stem 2 to the second hot bimetallic strip 52 through interaction with the second hot bimetallic strip 52, and the thrust generated by the heat bending deformation process of the flameout protection component 5 and the restoring force generated by the cooling reset process to the sealing block 62.

[0078] As an optional solution, please refer to Figure 7 and Figure 9 The first mating part 71 can be a locking nut, and the second mating part 72 can be an annular boss on the outer peripheral wall of the push rod 61. This arrangement facilitates the installation and removal of the flameout protection assembly 5 and the push rod 61 for maintenance or replacement.

[0079] As an alternative, both the first mating part 71 and the second mating part 72 can be in the form of annular steps on the outer peripheral wall of the push rod 61. The step surface of the first mating part 71 can be set to face the valve port 15, and the step surface of the second mating part 72 can be set to face away from the valve port 15. In the closed state, the second hot bimetallic strip 52 abuts against the step surface of the second mating part 72, and the above-mentioned force is transmitted through the interaction between the second hot bimetallic strip 52 and the two step surfaces.

[0080] As an alternative, the first mating part 71 and the second mating part 72 can both be locking nuts, and the above-mentioned force is transmitted through the interaction of the second hot bimetallic strip 52 and the two locking nuts.

[0081] Of course, the first mating part 71 and the second mating part 72 can both be annular bosses, or other locking parts, such as locking sleeves, or any combination of locking parts, annular bosses, and annular steps.

[0082] In the embodiments provided in this application, please refer to Figure 9 and Figure 10 It is understood that the second bimetallic strip 52 has a first mounting hole 523, through which the second bimetallic strip 52 is movably fitted onto the push rod 61. The first mounting hole 523 is a strip-shaped hole, and its length direction is parallel to the direction from the first end to the second end of the first bimetallic strip 51. This arrangement provides horizontal space for the fourth end of the second bimetallic strip 52 when the first bimetallic strip 51 is bent and deformed by heat, causing the flameout protection assembly 5 to shift downwards. This prevents the flameout protection assembly 5 from pulling the push rod 61 to either side of its axis when it moves downwards, thus extending the service life of the flameout protection assembly 5 and the push rod 61, and further ensuring the smooth operation of the valve opening.

[0083] It can be understood that a strip hole is a hole whose length is greater than its width; for example, it could be like... Figure 10The waist-shaped hole shown can also be a rectangular hole or an elliptical hole; this application does not limit it in this regard.

[0084] It is worth noting that the above embodiments describe the specific connection method between the fourth end of the second hot bimetallic strip 52 and the push rod 61 when the second hot bimetallic strip 52 is provided. However, when the second hot bimetallic strip 52 is not provided or when the second hot bimetallic strip 52 is provided but the third end of the second hot bimetallic strip 52 is not connected to the second end of the first hot bimetallic strip 51, that is, when the second end of the first hot bimetallic strip 51 is connected to the push rod 61, the first hot bimetallic strip 51 and the push rod 61 can also adopt the above connection method, and can also achieve the same technical effect as the above embodiments. It will not be described again here.

[0085] Please refer to this as well. Figure 11 and Figure 12 , Figure 11 for Figure 3 A magnified view of the center-turn plug valve at point D. Figure 12 for Figure 4 A magnified view of the valve body at point C.

[0086] In the embodiments provided in this application, such as Figure 11 As shown, the plug valve also includes a sealing assembly 9, which includes a mounting block 91 and at least one sealing ring. The valve body 1 has an outwardly extending annular protrusion 17. The mounting block 91 has a mounting groove 911, and the mounting block 91 is fitted onto the annular protrusion 17 through the mounting groove 911. The valve body 1 has a sealing groove 18, and the sealing ring is located in the sealing groove 18. Both the mounting block 91 and the sealing ring are fitted onto the push rod 61, with the mounting block 91 abutting against the sealing ring. In this way, the connection between the push rod 61 and the valve body 1 is sealed, making it difficult for gas to leak through this point and improving the safety of the plug valve during use.

[0087] In actual installation, the specific structure of the mounting block 91 and its connection method with the annular protrusion 17 are not limited. For an example, please refer to... Figure 11 The mounting block 91 can be a sealing nut, which can be threaded to the annular protrusion 17, thereby facilitating the disassembly of the sealing assembly 9 for inspection or replacement of the sealing element. Of course, the mounting block 91 can also be a square block, or it can be welded to the annular protrusion 17.

[0088] In actual installation, the specific structure of the sealing groove 18 and the number of sealing rings are not limited. For example, such as... Figure 12 As shown, the sealing groove 18 includes, from bottom to top, a first stepped hole 181, a second stepped hole 182, and an inner hole 183, forming a stepped shape. It axially penetrates the valve body 1 and communicates with the second valve cavity 12. The stepped surfaces of the first stepped hole 181 and the second stepped hole 182 both face away from the valve port 151. Figure 11As shown, there are two sealing rings, specifically a sealing gasket 92 and a sealing ring 93. The sealing gasket 92 is located in the first stepped hole 181, forming a first-level seal, and the sealing ring 93 is located in the second stepped hole 182, forming a second-level seal. The mounting block 91 abuts against the sealing gasket 92. The lower part of the push rod 61 passes through the inner hole 183, the sealing ring 93, the sealing gasket 92, and the mounting block 91 in sequence before connecting to the second hot bimetallic strip 52. In this way, a two-level seal can be achieved at the connection between the push rod 61 and the valve body 1, achieving a better sealing effect, improving the safety of the plug valve's operation, and ensuring the smooth operation of the plug valve. The sealing ring 93 can be an O-ring, which is inexpensive and has reliable sealing performance. Furthermore, the sealing groove 18 can also include only one stepped hole, or two or more sealing rings can be simultaneously set in one stepped hole.

[0089] Of course, when the second end of the first hot bimetallic strip 51 is connected to the push rod 61, the connection position between the push rod 61 and the valve body 1 can also be provided with the above-mentioned sealing structure, which will not be elaborated here.

[0090] In actual installation, the second end of the first bimetallic strip 51 and the third end of the second bimetallic strip 52 can be connected by bolts or by welding, and this application does not limit this connection.

[0091] Please refer to this as well. Figure 13 and Figure 14 , Figure 13 for Figure 2 A magnified view of the center-turn plug valve at point B. Figure 14 for Figure 3 A magnified view of the central plug valve at point E.

[0092] In actual setup, the connection method between the first end of the first hot bimetallic strip 51 and the valve body 1 is not limited.

[0093] In the embodiments provided in this application, such as Figure 13 and Figure 14 As shown, the plug valve also includes a fixed rod 8, a first limiting member 73, and a second limiting member 74; one end of the fixed rod 8 is connected to the valve body 1, and the first limiting member 73 and the second limiting member 74 are both located on the outer peripheral wall of the other end of the fixed rod 8 and distributed along the axial direction of the fixed rod 8. Figure 13 In the middle, the second limiting member 74 is located above the first limiting member 73; the first end of the first hot bimetallic strip 51 is sleeved on the fixing rod 8. For details, please refer to... Figure 5The first bimetallic strip 51 can have a second mounting hole 513, and can be sleeved onto the fixing rod 8 through the second mounting hole 513. The lower surface of the first bimetallic strip 51 abuts against the first limiting member 73, and the upper surface abuts against the second limiting member 74, thereby fixing it axially with the fixing rod 8. In this way, the first end of the first bimetallic strip 51 and the valve body 1 can be stably connected, so that the function of the first end as the fixed end can be stably performed, and the displacement generated by the bending deformation of the first bimetallic strip 51 can be better reflected at the free end, thus improving the valve opening effect.

[0094] In actual setup, similar to the specific structure of the first mating part 71 and the second mating part 72, the first limiting part 73 and the second limiting part 74 can also be any combination of locking parts, annular bosses, and annular steps.

[0095] As an optional solution, such as Figure 13 and Figure 14 As shown, the first limiting member 73 can be a locking nut, and the second limiting member 74 can be an annular boss. This not only ensures the stable installation of the first bimetallic strip 51 on the valve body 1, but also facilitates the installation and removal of the first bimetallic strip 51. Furthermore, by controlling the length of the fixing rod 8, the distance between the flameout protection assembly 5 and the valve body 1 can be controlled, providing space for the aforementioned second mating member 72 and mounting block 91. Other structural combinations of the first limiting member 73 and the second limiting member 74 are similar in principle to the combination of the locking nut and the annular boss, and will not be elaborated further here.

[0096] In an embodiment of this application, a gas appliance is also provided, which includes a burner and a stopcock valve as described in all the above embodiments, wherein a first hot bimetallic strip 51 is disposed close to the burner so that the open flame generated by the burner can transfer heat to the first hot bimetallic strip 51.

[0097] It is easy to understand that gas appliances are appliances that use gas as fuel, which can be gas water heaters, gas stoves, or gas ovens, with no specific limitations. Taking a gas stove as an example, the temperature of its flame core is approximately 800-1000 degrees Celsius. The specific materials of the active and passive layers of the first bimetallic strip 51 and the second bimetallic strip 52 can be set according to their operating temperature range after conduction and adjustment. The gas appliance provided in this application embodiment adopts the simple and low-cost plug valve provided in all the above embodiments, which simplifies the structure and reduces manufacturing costs.

[0098] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand the apparatus and core ideas of this application. It should be noted that those skilled in the art can make several improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. A plug valve, characterized in that, It includes a valve body (1), a valve stem (2), a seal (6), and a flameout protection assembly (5); The valve body (1) has a valve port (151), and the valve stem (2) is capable of pushing the seal (6) away from the valve port (151). The flameout protection assembly (5) includes a first thermal bimetallic strip (51), which has a first end and a second end. The first end is connected to the valve body (1), and the second end is connected to the seal (6). When the first hot bimetallic strip (51) is heated and bent, it can drive the seal (6) away from the valve port (151). When the first hot bimetallic strip (51) is cooled and reset, it can drive the seal (6) to approach and close the valve port (151).

2. The plug valve according to claim 1, characterized in that, The flameout protection assembly (5) also includes a second thermal bimetallic strip (52); The second thermal bimetallic strip (52) has a third end and a fourth end. The third end is connected to the second end of the first thermal bimetallic strip (51) or the valve body (1), and the fourth end is connected to the seal (6). The direction of the second thermal bimetallic strip (52) bending under heat is opposite to the direction of the first thermal bimetallic strip (51) bending under heat.

3. The plug valve according to claim 2, characterized in that, The length of the second thermal bimetallic strip (52) is greater than the length of the first thermal bimetallic strip (51), and / or the thickness of the second thermal bimetallic strip (52) is less than the thickness of the first thermal bimetallic strip (51).

4. The plug valve according to any one of claims 1 to 3, characterized in that, The sealing element (6) includes a push rod (61) and a sealing block (62). The sealing block (62) is located at the end of the push rod (61) near the valve port (151). The sealing block (62) can be close to or away from the valve port (151). The end of the push rod (61) away from the valve port (151) extends out of the valve body (1) and is connected to the flameout protection assembly (5).

5. The plug valve according to claim 4, characterized in that, The push rod (61) has a boss (611) at the end near the valve port (151), and the sealing block (62) has a recess (622). The sealing block (62) is fitted onto the boss (611) so that the boss (611) is confined to the recess (622).

6. The plug valve according to claim 4, characterized in that, The plug valve also includes a first mating part (71) and a second mating part (72); The first mating part (71) and the second mating part (72) are both provided on the outer peripheral wall of the push rod (61). The second mating part (72) is located on the side of the first mating part (71) near the valve port (151). The flameout protection component (5) is movably sleeved on the push rod (61) and located between the first mating part (71) and the second mating part (72). In the closed state, the flameout protection component (5) abuts against the second mating part (72).

7. The plug valve according to claim 6, characterized in that, The flameout protection component (5) is connected to the push rod (61) at one end with an installation hole. The flameout protection component (5) is movably sleeved on the push rod (61) through the installation hole. The installation hole is a strip-shaped hole, and the length direction of the installation hole is parallel to the direction from the first end to the second end of the first hot bimetallic strip (51).

8. The plug valve according to claim 4, characterized in that, The plug valve also includes a sealing assembly (9), which includes a mounting block (91) and at least one sealing ring; The valve body (1) has an outwardly extending annular protrusion (17), the mounting block (91) has a mounting groove (911), the mounting block (91) is fitted onto the annular protrusion (17) through the mounting groove (911), the valve body (1) has a sealing groove (18), the sealing ring is located in the sealing groove (18), the mounting block (91) and the sealing ring are both fitted onto the push rod (61), and the mounting block (91) abuts against the sealing ring.

9. The plug valve according to any one of claims 1 to 3, characterized in that, The plug valve also includes a fixed rod (8), a first limiting member (73), and a second limiting member (74). One end of the fixing rod (8) is connected to the valve body (1). The first limiting member (73) and the second limiting member (74) are both provided on the outer peripheral wall of the other end of the fixing rod (8) and distributed along the axial direction of the fixing rod (8). The first end of the first hot bimetallic strip (51) is sleeved on the fixing rod (8) and located between the first limiting member (73) and the second limiting member (74) so ​​that the first end of the first hot bimetallic strip (51) is fixed to the fixing rod (8) along the axial direction.

10. A gas appliance, comprising a burner, characterized in that, The gas appliance further includes a plug valve as described in any one of claims 1 to 9; The first hot bimetallic strip (51) is positioned close to the burner so that the open flame generated by the burner can transfer heat to the first hot bimetallic strip (51).

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