A gas temperature limiting protection valve

Abstract

The utility model discloses a kind of gas temperature-limiting protection valves, wherein, including the valve body of middle pass, the air inlet and the air outlet respectively provided on the upper and lower valve body, the valve body inside between the air inlet and the air outlet is equipped with the middle pass inner tube respectively communicated with the valve body inside and the air outlet, the first heavy protection valve core is equipped with in the middle pass inner tube side in the valve body, the second heavy protection valve core is equipped with in the other side, the capillary tube extended from the valve body inside to outside is connected on the first heavy protection valve core, and temperature sensor is equipped on the capillary tube end portion.The utility model has the effect of responsive sensitive and safe.

Description

Technical Field

[0001] This utility model belongs to the field of gas valves, and specifically relates to a gas temperature limiting protection valve used in coal gas, natural gas oil grills, fryers, griddles, ovens, and heating stoves. Background Technology

[0002] Currently, most gas valves on the market are single-response type. These valves include a valve body, an inlet and an outlet located at the top and bottom of the valve body respectively, a single-protection valve core on one side of the valve body to control the connection between the inlet and outlet, and a temperature sensor on the outside of the valve body that controls the connection between the single-protection valve core. Existing single-protection valve cores mainly consist of a hydraulic piston sealing rod within the valve body that isolates the connection between the inlet and outlet, and a return spring assembly on the outside of the hydraulic piston sealing rod. The hydraulic medium used for the hydraulic piston sealing rod to extend and isolate the connection is connected to the hydraulic medium used for real-time temperature sensing by the temperature sensor. In its initial state, the hydraulic piston sealing rod is retracted under the action of the return spring, and the air inlet and outlet are connected, which is the normal working state. When the temperature detected by the temperature sensor is abnormal, the internal hydraulic medium expands and flows into the hydraulic piston sealing rod, pushing the hydraulic piston sealing rod out to isolate the air inlet and outlet. At the same time, external environmental equipment (such as electrical equipment, gas equipment, etc.) associated with the gas valve also stops working, thus achieving a safety protection function. The process of pushing the hydraulic piston sealing rod out is achieved by using the temperature sensor to detect the continuously rising abnormal temperature, causing the hydraulic medium inside the temperature sensor to continuously expand and push the hydraulic piston sealing rod forward to achieve the purpose of isolating the air inlet and outlet. However, most existing single-response gas valves use hydraulic piston sealing rods, which can cause slow response protection when abnormal noises occur due to temperature. Furthermore, external environmental equipment associated with the gas valve, such as electrical equipment and gas equipment, may experience abnormal temperatures and pressures exceeding their tolerance levels after the inlet and outlet are isolated, posing a risk of damage to the external environmental equipment. Utility Model Content

[0003] In view of the above problems, the purpose of this utility model is to provide a gas temperature limiting protection valve that is responsive and safe.

[0004] To achieve the above objectives, this utility model provides a gas temperature limiting protection valve, comprising a valve body with a central opening, an inlet and an outlet respectively located at the top and bottom of the valve body, a central inner tube inside the valve body between the inlet and outlet communicating with both the valve body interior and the outlet, a first protection valve core located on one side of the central inner tube within the valve body, and a second protection valve core located on the other side, a capillary tube extending from the valve body interior to the exterior connected to the first protection valve core, and a temperature sensing probe located at the end of the capillary tube. The capillary tube and the temperature sensing probe contain interconnected temperature-sensing working fluids. The central inner tube communicates with both the valve body interior and the outlet. The inlet communicates with the valve body interior. A pressure cap sealing the valve body opening is provided at one end of the valve body corresponding to the position of the first protection valve core, and a valve cover sealing the valve body opening is provided at one end of the valve body corresponding to the position of the second protection valve core.

[0005] The first-level protection valve core includes a diaphragm box extending from the inside of the valve body to the outside and connected to the capillary tube on a pressure cap at the corresponding opening position of the central tube; a nut for fixing the diaphragm box on the pressure cap; a working fluid chamber inside the diaphragm box that communicates with the temperature-sensing working fluid inside the capillary tube; a base on the diaphragm box inside the valve body; a connecting rod on the base; a sealing ring on the end of the connecting rod; and a first return spring between the sealing ring and the diaphragm box.

[0006] A vent hole communicating with the inside of the valve body is provided on the opening of the inner tube at the corresponding sealing ring position.

[0007] The second-layer protection valve core includes a gap between the valve cover and the inner tube, a temperature-sensitive composite bimetallic spring corresponding to the opening of the inner tube within the gap, and reset rods extending towards both ends of the inner tube inside the inner tube. One end of each reset rod has a first contact extending to the opening of the inner tube and contacting the connecting rod, while the other end has a second contact contacting the temperature-sensitive composite bimetallic spring at the opening of the inner tube. A limiting block is provided inside the opening of the inner tube between the first contact and the reset rod to limit the movement of the first contact.

[0008] In some embodiments, a manual reset device is provided on the valve cover on one side of the temperature-sensing composite bimetallic spring. The manual reset device includes an outwardly extending tube on the valve cover located on the side of the temperature-sensing composite bimetallic spring, a trapezoidal groove communicating with a gap in the tube, a pressing rod extending into the gap in the trapezoidal groove, a fixing block in contact with the temperature-sensing composite bimetallic spring at one end of the pressing rod, a pressing button at the other end, and a second reset spring provided between the pressing button in the trapezoidal groove and the tube.

[0009] In some embodiments, the temperature-sensing composite bimetallic spring is mainly composed of an arc-shaped composite metal disc. The bottom of the composite metal disc deforms backward after being acted upon by the second contact.

[0010] In some embodiments, the rearward reversible portion of the bottom of the composite metal disc is between 0.27 mm and 1.25 mm.

[0011] In some embodiments, the composite metal disc is made of a stainless steel layer and a nickel metal composite.

[0012] In some implementations, the base is a U-shaped tube. The base is threadedly connected to the connecting rod.

[0013] In some implementations, the applicable temperature environment for the temperature sensing probe is between 50°C and 350°C, and the applicable temperature environment for the temperature sensing composite bimetallic strip is between 80°C and 120°C.

[0014] The beneficial effects of this utility model are its sensitive and safe response. Because this valve employs a dual-protection system with a first-stage and a second-stage protection valve core, its response temperature is between 80℃ and 120℃, a range that matches the operating temperature of the associated equipment. Furthermore, if an abnormal temperature occurs and the set temperature is reached, the temperature-sensing composite bimetallic spring in the second-stage protection valve core and the diaphragm in the first-stage protection valve core will instantly respond, disconnecting the vent from the valve body's interior and separating the inlet and outlet. Thus, this valve achieves both sensitive response and safety. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the first and second protection valve cores in the open state of this utility model.

[0016] Figure 2 This is a schematic diagram of the first and second protection valve cores in the closed state of this utility model.

[0017] Figure 3 This is a schematic diagram of the membrane box component in its normal state according to this utility model;

[0018] Figure 4 This is a schematic diagram of the membrane box component in its normal state according to this utility model;

[0019] Figure 5 This is a schematic diagram of the rearward reverse side of the temperature-sensitive composite bimetallic spring sheet in this utility model.

[0020] Figure 6 This is a top view of the temperature-sensitive composite bimetallic spring sheet in this utility model. Detailed Implementation

[0021] The utility model will now be described in further detail with reference to the accompanying drawings.

[0022] like Figure 1-6 As shown, a gas temperature limiting protection valve includes a centrally located valve body 01, an inlet 02 and an outlet 03 respectively located above and below the valve body 01, a centrally located inner tube 04 located inside the valve body 01 between the inlet 02 and the outlet 03, communicating with both the interior of the valve body 01 and the outlet 03, a first-level protection valve core 05 located on one side of the centrally located inner tube 04 within the valve body 01, and a second-level protection valve core 06 located on the other side, a capillary tube 07 extending from the interior of the valve body 01 to the exterior connected to the first-level protection valve core 05, and a temperature sensing probe 08 located at the end of the capillary tube 07. A temperature-sensing working fluid 09 is disposed inside the capillary tube 07 and the temperature sensing probe 08, which are interconnected.

[0023] The central tube 04 is connected to the interior of the valve body 01 and the air outlet 03, while the air inlet 02 is connected to the interior of the valve body 01. Specifically, the side of the central tube 04 is connected to the air outlet 03, the front end is connected to the interior of the valve body 01, and the rear end is connected to the second protective valve core. When the first protective valve core 05 is open, the central tube 04 is connected to the interior of the valve body 01, and the interior of the valve body 01 is connected to the central tube 04, meaning the air inlet 02 is connected to the air outlet 03. When the first protective valve core 05 is closed, the central tube 04 is not connected to the interior of the valve body 01, meaning the air inlet 02 is not connected to the air outlet 03. The applicable temperature range for the temperature sensor 08 is 50℃-350℃, and the applicable temperature range for the temperature-sensing composite bimetallic strip is 80℃-120℃.

[0024] A pressure cap 10 is provided on one end opening of the valve body 01 corresponding to the position of the first protection valve core 05 to seal the opening of the valve body 01. To ensure the sealing of the valve body 01, a first sealing ring 11 is installed between the pressure cap 10 and the opening of the valve body 01. A valve cover 12 is provided on one end opening of the valve body 01 corresponding to the position of the second protection valve core 06 to seal the opening of the valve body 01. A second sealing ring 13 is added between the valve cover 12 and the opening of the valve body 01 to enhance the sealing effect. In addition, the valve cover 12 can be fixedly connected to one side of the valve body 01 opening by screws.

[0025] The first-level protection valve core 05 includes a diaphragm box 51 extending from the inside of the valve body 01 to the outside and connected to the capillary tube 07, located on a pressure cap 10 at the opening position of the corresponding central tube 04; a nut 52 for fixing the diaphragm box 51 on the pressure cap 10; a working fluid chamber 53 inside the diaphragm box 51 communicating with the temperature-sensing working fluid 09 inside the capillary tube 07; a base 54 on the diaphragm box 51 inside the valve body 01; a connecting rod 55 on the base 54; a sealing ring 56 at the end of the connecting rod 55; and a first return spring 57 between the sealing ring 56 and the diaphragm box 51. A vent hole 58 communicating with the inside of the valve body 01 is provided at the opening of the central tube 04 at the position corresponding to the sealing ring 56. A washer 59 is provided between the sealing ring 56 and the end of the connecting rod 55; and a retaining ring 510 is provided at the end of the connecting rod 55. A third sealing ring 511 was added between the nut 52 and the gland 10 to provide a sealing effect.

[0026] The second-level protection valve core 06 includes a gap 61 between the valve cover 12 and the central inner tube 04; a temperature-sensitive composite bimetallic spring 62 corresponding to the opening position of the central inner tube 04 within the gap 61; a reset rod 63 extending towards both ends of the central inner tube 04 inside the central inner tube 04; a first contact 64 extending to the opening position of the central inner tube 04 and contacting the connecting rod 55 at one end of the reset rod 63; and a second contact 65 at the other end, contacting the temperature-sensitive composite bimetallic spring 62 at the opening position of the central inner tube 04. The temperature-sensitive composite bimetallic spring 62 is mainly composed of an arc-shaped composite metal disc. When the bottom of the composite metal disc is subjected to the action of the second contact 65, it deforms backward. The backward deformation range of the bottom of the composite metal disc is between 0.27mm and 1.25mm. The composite metal disc is made of a stainless steel layer and nickel metal. The aforementioned first contact 64 is a trapezoidal block. A limiting block 66 is provided inside the central tube 04 between the first contact 64 and the reset rod 63 to limit the first contact 64 from extending further outwards. A manual reset device 14 is provided on the valve cover 12 on one side of the temperature-sensing composite bimetallic spring 62.

[0027] Working principle of gas temperature control dual protection valve:

[0028] like Figure 1-2 As shown

[0029] (1) The valve core of the gas temperature control dual protection valve is in the open state for gas supply.

[0030] Applicable environment: Temperature control range: 50-350℃, set according to customer requirements; Temperature control accuracy: within ±3℃; Operating gas pressure: within 5KPa; No gas leakage at any connection point under 5KPa gas pressure; Applicable gases: Liquefied petroleum gas, natural gas, coal gas; Operating ambient temperature: -20℃-80℃.

[0031] In the initial state of normal operation: The temperature-sensing composite bimetallic spring 62 bends towards the inner tube 04 and presses against the reset rod 63. The first contact 64 on the reset rod 63 extends from the opening of the inner tube 04 and contacts the connecting rod 55. At this time, the extension length of the first contact 64 is limited by the limiting block 66. Since the force of the first reset spring 57 pressing the sealing ring 56 to reset the connecting rod 55 downward is less than the force of the temperature-sensing composite bimetallic spring 62 to push the reset rod 63 upward to open the connecting rod 55, a gap is formed between the sealing ring 56 and the opening of the inner tube 04. The vent hole 58 on the opening of the inner tube 04 communicates with the inside of the valve body 01. The inside of the valve body 01 communicates with the air inlet 02. The vent hole 58 communicates with the inside of the inner tube 04. The inner tube 04 communicates with the air outlet 03. Therefore, the air inlet 02 and the air outlet 03 are in a connected state.

[0032] (2) Protective working state of the gas temperature control dual protection valve core port closed.

[0033] When the equipment malfunctions and abnormally heats up to the set temperature of the valve body, the temperature-sensing working fluid 09 filled in the temperature probe 08 expands due to heat. The working fluid 09 enters the working fluid chamber 53 of the diaphragm housing 51 through the capillary tube 07, causing the diaphragm 50 on the bottom surface of the diaphragm housing 51 to expand. The base 54, connecting rod 55, and sealing ring 56 move forward as a whole, simultaneously pushing the reset rod 63 forward. The temperature-sensing composite bimetallic spring 62 is reversed under the action of the reset rod 63. The entire process is completed in an instant. At this time, the sealing ring 56, under the action of the first reset spring 57, blocks the vent 58. The vent 58 is no longer connected to the inside of the valve body 01, and the inlet 02 and outlet 03 are also no longer connected. That is, the first layer of protection, the valve core 05, closes the valve port, cutting off the air supply, and the externally connected equipment receives an immediate response.

[0034] For example, if the environment where this dual-protection valve is installed is abnormal, or if the equipment using this valve experiences an abnormal temperature rise, exceeding the ambient temperature by 80℃, the temperature can be set by the customer within any temperature range between 80℃ and 110℃. When the temperature sensed by the temperature-sensing bimetallic strip reaches the specified set temperature value, it automatically reverses, the reset lever 63 drops, the valve port closes, and the gas supply is cut off, providing safety protection for the equipment and the environment. This achieves dual protection for both functions. When the equipment is already in a protected state, a safety inspection and maintenance are required. After the equipment is repaired and functioning normally, the manual reset device 14 of the protection valve needs to be manually pressed to reset it, restoring the protection valve to its open working state.

[0035] The manual reset device 14 includes a tube 141 extending outward on a valve cover 12 located on one side of the temperature-sensitive composite bimetallic spring 62, a trapezoidal groove 142 communicating with the gap 61 inside the tube 141, a pressing rod 143 extending into the gap 61 inside the trapezoidal groove 142, a fixing block 144 in contact with the temperature-sensitive composite bimetallic spring 62 at one end of the pressing rod 143, a pressing button 145 at the other end, and a second reset spring 146 between the pressing button 145 inside the trapezoidal groove 142 and inside the tube 141.

[0036] When the temperature-sensing composite bimetallic spring 62 jumps backward under the action of the reset rod 63, you only need to press the button 145. The fixing block 144 at the end of the pressing rod 143 will cause the temperature-sensing composite bimetallic spring 62 to jump back and press against the reset rod 63.

[0037] The above descriptions are merely some embodiments of this utility model. For those skilled in the art, various modifications and improvements can be made without departing from the inventive concept of this utility model, and all such modifications and improvements fall within the protection scope of this utility model.

Claims

1. A gas temperature limiting protection valve, characterized by, The valve body includes a central valve body, an air inlet and an air outlet respectively located at the top and bottom of the valve body, a central inner tube located inside the valve body between the air inlet and the air outlet that communicates with the inside of the valve body and the air outlet respectively, a first protection valve core located on one side of the central inner tube inside the valve body, a second protection valve core located on the other side, a capillary tube extending from the inside of the valve body to the outside connected to the first protection valve core, and a temperature sensing probe located at the end of the capillary tube. The capillary tube and the temperature probe are equipped with interconnected temperature-sensing working fluids. The central tube is connected to the inside of the valve body and the air outlet; The air inlet is connected to the inside of the valve body; A pressure cap is provided on one end of the valve body opening corresponding to the position of the first protection valve core to seal the valve body opening, and a valve cover is provided on one end of the valve body opening corresponding to the position of the second protection valve core to seal the valve body opening. The first protection valve core includes a diaphragm box extending from the inside of the valve body to the outside and connected to the capillary tube on a pressure cap at the corresponding opening position of the central tube; a nut for fixing the diaphragm box on the pressure cap; a working fluid chamber inside the diaphragm box that communicates with the temperature-sensing working fluid inside the capillary tube; a base on the diaphragm box inside the valve body; a connecting rod on the base; a sealing ring on the end of the connecting rod; and a first return spring between the sealing ring and the diaphragm box. A vent hole communicating with the inside of the valve body is provided on the opening of the central tube at the corresponding sealing ring position; The second protection valve core includes a gap between the valve cover and the central tube, a temperature-sensing composite bimetallic spring corresponding to the opening position of the central tube in the gap, a reset rod extending to both ends of the central tube inside the central tube, and a first contact extending to the opening position of the central tube and contacting the connecting rod on one end of the reset rod, and a second contact extending to the opening position of the central tube and contacting the temperature-sensing composite bimetallic spring on the other end. A limiting block is provided on the inner side of the central tube between the first contact and the reset rod to limit the movement of the first contact.

2. A gas temperature limiting protection valve according to claim 1, characterised in that The valve cover on one side of the temperature-sensing composite bimetallic spring is equipped with a manual reset device. The manual reset device includes an outwardly extending tube on a valve cover located on one side of the temperature-sensitive composite bimetallic spring, a trapezoidal groove communicating with a gap inside the tube, a pressing rod extending into the gap inside the trapezoidal groove, a fixing block in contact with the temperature-sensitive composite bimetallic spring at one end of the pressing rod, a pressing button at the other end, and a second reset spring between the pressing button inside the trapezoidal groove and the tube.

3. A gas temperature limiting protection valve according to claim 1 or 2, characterised in that The aforementioned temperature-sensing composite bimetallic spring is mainly composed of an arc-shaped composite metal disc. The bottom of the composite metal disk deforms backward after being acted upon by the second contact.

4. A gas temperature limiting protection valve according to claim 3, characterised in that The reverse side of the bottom of the composite metal disc is between 0.27mm and 1.25mm.

5. A gas temperature limiting protection valve according to claim 1, wherein The composite metal disc is made of a stainless steel layer and a nickel metal composite.

6. A gas temperature limiting protection valve according to claim 1, characterized in that The base is a U-shaped tube; the base is threadedly connected to the connecting rod.

7. A gas temperature limiting protection valve according to claim 1, wherein The temperature environment of the temperature sensing probe is between 50-350 DEG C, and the temperature environment of the temperature sensing bimetallic strip is between 80-120 DEG C.

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