Fuel gas temperature limiting protective valve

Abstract

The invention discloses a fuel gas temperature limiting protection valve which comprises a through valve body, a gas inlet and a gas outlet which are formed in the upper portion and the lower portion of the valve body respectively, a through inner pipe arranged in the valve body between the gas inlet and the gas outlet and communicated with the interior of the valve body and the gas outlet respectively, and a first protection valve element arranged on one side of the through inner pipe in the valve body. A capillary tube which extends from the interior of the valve body to the exterior of the valve body is connected to the first protection valve core, and a temperature sensing probe is arranged at the end part of the capillary tube. The invention has the effects of sensitive response and safety.

Description

Technical Field

[0001] The present invention belongs to the field of gas valves, and particularly relates to a gas temperature-limiting protection valve applied to gas, natural gas oil pans, deep fryers, grills, ovens, heating stoves, etc. Background Art

[0002] Currently, the gas valves on the market are mainly gas valves with a single response mode. The gas valve with a single response mode includes a valve body, an air inlet and an air outlet respectively arranged above and below the valve body, a single protection valve core arranged on one side of the valve body to control the conduction between the air inlet and the air outlet, and a temperature-sensing probe for the single protection valve core arranged outside the valve body. The existing single protection valve core mainly consists of a hydraulic piston sealing rod arranged in the valve body to cut off the conduction state between the air inlet and the air outlet, and a return spring assembly arranged outside the hydraulic piston sealing rod. Among them, the hydraulic medium used for the hydraulic piston sealing rod to extend for the cut-off movement is the same as the hydraulic medium used for the real-time temperature sensing of the temperature-sensing probe. In the initial state of use, under the action of the return spring, the hydraulic piston sealing rod is in a retracted state, and the air inlet and the air outlet are conducted, which is a normal working state; when the temperature detected by the temperature-sensing probe is abnormal, the internal hydraulic medium expands and flows into the hydraulic piston sealing rod, pushing the hydraulic piston sealing rod to extend to cut off the air inlet and the air outlet. At the same time, the external environmental equipment associated with the gas valve (such as electrical equipment, gas equipment, etc.) also stops working accordingly, so as to play a role in safety protection. Since the process of pushing the hydraulic piston sealing rod to extend is to use the temperature-sensing probe to detect the continuously rising abnormal temperature, so that the hydraulic medium inside the temperature-sensing probe continuously expands to push the hydraulic piston sealing rod to continuously extend forward to achieve the purpose of cutting off the air inlet and the air outlet. However, most of the existing gas valves with a single response mode adopt a hydraulic piston sealing rod, resulting in a problem of slow response protection when the temperature makes a strange noise; and, for the external environmental equipment associated with the gas valve, such as electrical equipment, gas equipment, etc., after cutting off the air inlet and the air outlet, the abnormal temperature and temperature pressure have exceeded the tolerance value of the external environmental equipment, which will cause the risk of burning out the external environmental equipment. Summary of the Invention

[0003] In view of the above problems, the purpose of the present invention is to provide a gas temperature-limiting protection valve with sensitive response and safety.

[0004] To achieve the above object, the present invention provides a gas temperature-limiting protection valve, which includes a body with a through hole in the middle, an air inlet and an air outlet respectively provided at the upper and lower parts of the body, a through inner tube communicating with the inside of the body and the air outlet respectively provided inside the body between the air inlet and the air outlet, a first-stage protection valve core provided on one side of the through inner tube in the valve body, a second-stage protection valve core provided on the other side, a capillary tube connected to the first-stage protection valve core and extending from the inside of the body to the outside, and a temperature-sensing probe provided at the end of the capillary tube. The capillary tube and the temperature-sensing probe are internally provided with a temperature-sensing working medium that communicates with each other. The through inner tube communicates with the inside of the body and the air outlet. The air inlet communicates with the inside of the body. A gland for sealing the opening of the valve body is provided on the opening at one end of the valve body corresponding to the position of the first-stage protection valve core, and a valve cover for sealing the opening of the valve body is provided on the opening at one end of the valve body corresponding to the position of the second-stage protection valve core.

[0005] The first-stage protection valve core includes a diaphragm box member provided on the gland corresponding to the opening position of the through inner tube and extending from the inside of the body to the outside and connected to the capillary tube, a nut provided on the gland for fixing the diaphragm box member, a working medium chamber provided inside the diaphragm box member and communicating with the temperature-sensing working medium inside the capillary tube, a base provided on the diaphragm box member inside the valve body, a connecting rod provided on the base, a sealing ring provided at the end of the connecting rod, and a first return spring provided between the sealing ring and the diaphragm box member.

[0006] An air vent communicating with the inside of the body is provided on the opening of the through inner tube corresponding to the position of the sealing ring.

[0007] The second-stage protection valve core includes a gap provided between the valve cover and the through inner tube, a temperature-sensing composite bimetallic spring piece provided in the gap and corresponding to the pipe orifice position of the through inner tube, a reset rod provided inside the through inner tube and extending in the direction of both ends of the through inner tube respectively, a first contact provided at one end of the reset rod and extending to the pipe orifice position of the through inner tube and contacting the connecting rod, and a second contact provided at the other end and contacting the temperature-sensing composite bimetallic spring piece extending to the pipe orifice position of the through inner tube. A limiting block for limiting the first contact is provided on the inner side of the pipe orifice of the through inner tube between the first contact and the reset rod.

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

[0009] In some embodiments, the temperature-sensitive composite bimetallic disc 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 range of the backward deformation 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 composed of a stainless steel layer and a nickel metal composite.

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

[0013] In some embodiments, the applicable temperature environment of the temperature-sensitive probe is between 50°C and 350°C, and the applicable temperature environment of the temperature-sensitive composite bimetallic disc is between 80°C and 120°C.

[0014] The beneficial effect of the present invention is to have a sensitive and safe response. Since this valve adopts a double protection core of a first protection valve core and a second protection valve core, the response temperature is between 80°C and 120°C, and this temperature range meets the temperature tolerance of the associated equipment. Moreover, as long as the temperature is abnormal and reaches the set temperature, the temperature-sensitive composite bimetallic disc spring in the second protection valve core and the bottom diaphragm of the diaphragm box in the first protection valve core will respond instantly, the vent hole is cut off from the inside of the valve body, and the air inlet and the air outlet are also not connected. In this way, this valve achieves a sensitive and safe response. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic structural diagram of the first protection valve core and the second protection valve core in the open state of the present invention;

[0016] Figure 2 is a schematic structural diagram of the first protection valve core and the second protection valve core in the closed state of the present invention;

[0017] Figure 3 is a schematic structural diagram of the diaphragm box in the normal state of the present invention;

[0018] Figure 4 is a schematic structural diagram of the diaphragm box in the normal state of the present invention;

[0019] Figure 5 is a schematic structural diagram of the temperature-sensitive composite bimetallic disc spring deforming backward of the present invention.

[0020] Figure 6 is a top view structural diagram of the temperature-sensitive composite bimetallic disc spring of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] The present invention will be further described in detail below with reference to the accompanying drawings.

[0022] As shown Figure 1-6 in the figure, a gas temperature-limiting protection valve includes a body 01 with a central through passage, an air inlet 02 and an air outlet 03 respectively arranged above and below the body 01, a central through inner tube 04 that is respectively communicated with the inside of the body 01 and the air outlet 03 inside the body 01 between the air inlet 02 and the air outlet 03, a first-stage protection valve core 05 arranged on one side of the central through inner tube 04 in the body 01, a second-stage protection valve core 06 arranged on the other side, a capillary tube 07 connected to the first-stage protection valve core 05 and extending from the inside of the body 01 to the outside, and a temperature-sensing probe 08 arranged at the end of the capillary tube 07. A temperature-sensing working medium 09 that is mutually communicated is arranged inside the capillary tube 07 and the temperature-sensing probe 08.

[0023] The central through inner tube 04 is communicated with the inside of the body 01 and the air outlet 03, and the air inlet 02 is communicated with the inside of the body 01; that is, the side of the above-mentioned central through inner tube 04 is communicated with the air outlet 03, the front end is communicated with the inside of the body 01, and the rear end is communicated with the second protection valve core; when the first-stage protection valve core 05 is opened, the central through inner tube 04 is communicated with the inside of the body 01, and the inside of the body 01 is communicated with the central through inner tube 04, that is, the air inlet 02 is communicated with the air outlet 03; when the first-stage protection valve core 05 is closed, the central through inner tube 04 is not communicated with the inside of the body 01, that is, the air inlet 02 is not communicated with the air outlet 03. The applicable temperature environment of the temperature-sensing probe 08 is between 50°C and 350°C, and the applicable temperature environment of the temperature-sensing composite bimetallic sheet is between 80°C and 120°C.

[0024] A gland 10 for sealing the opening of the body 01 is arranged at the opening at one end of the body 01 corresponding to the position of the first-stage protection valve core 05. To ensure the sealing performance inside the body 01, a first sealing ring 11 is installed between the gland 10 and the opening of the body 01. A valve cover 12 for sealing the opening of the body 01 is arranged at the opening at one end of the body 01 corresponding to the position of the second-stage protection valve core 06, and a second sealing ring 13 that increases the sealing effect is arranged between the valve cover 12 and the opening of the body 01. In addition, the valve cover 12 can be fixedly connected to one side of the opening of the body 01 through screws.

[0025] The first-stage protection valve core 05 includes a bellows member 51 provided on a gland 10 corresponding to the opening position of the through inner tube 04, extending from the inside of the valve body 01 to the outside and connected to a capillary 07; a nut 52 for fixing the bellows member 51 is provided on the gland 10; a working fluid chamber 53 communicating with the temperature-sensitive working fluid 09 inside the capillary 07 is provided inside the bellows member 51; a base 54 is provided on the bellows member 51 inside the valve body 01; a connecting rod 55 is provided on the base 54; a sealing ring 56 is provided at the end of the connecting rod 55, and a first return spring 57 is provided between the sealing ring 56 and the bellows member 51. An air vent 58 communicating with the inside of the valve body 01 is provided at the opening of the through inner tube 04 corresponding to the position of the sealing ring 56, and the above air vent 58 communicates with the inside of the through inner tube 04. A washer 59 is provided between the sealing ring 56 and the end of the connecting rod 55; a snap ring 510 is provided at the end of the connecting rod 55. A third sealing ring 511 is added between the nut 52 and the gland 10 to enhance the sealing effect.

[0026] The second-stage protection valve core 06 includes a gap 61 provided between the valve cover 12 and the through inner tube 04; a temperature-sensitive composite bimetallic spring piece 62 corresponding to the pipe orifice position of the through inner tube 04 is provided in the gap 61; a reset rod 63 extending in both directions of the through inner tube 04 is provided inside the through inner tube 04, and a first contact 64 extending to the pipe orifice position of the through inner tube 04 and contacting the connecting rod 55 is provided at one end of the reset rod 63, and a second contact 65 extending to the pipe orifice position of the through inner tube 04 and contacting the temperature-sensitive composite bimetallic spring piece 62 is provided at the other end. The above temperature-sensitive composite bimetallic spring piece 62 is mainly composed of an arc-shaped composite metal disc. When the bottom of the composite metal disc is acted on by the second contact 65, it deforms backward. The range of the backward deformation of the bottom of the composite metal disc is between 0.27 mm and 1.25 mm. The composite metal disc is composed of a stainless steel layer and a nickel metal composite. The above first contact 64 is a trapezoidal block. A limit block 66 for limiting the first contact 64 is provided on the inner side of the pipe orifice of the through inner tube 04 between the first contact 64 and the reset rod 63. The limit block 66 can limit the further outward extension of the first contact 64. A manual reset device 14 is provided on the valve cover 12 on one side of the temperature-sensitive composite bimetallic spring piece 62.

[0027] Working principle of the combustion gas temperature control double protection valve:

[0028] As Figure 1-2 shown

[0029] (1) The valve core orifice of the combustion gas temperature control double protection valve is in the open and ventilated use state

[0030] Applicable environment: Temperature control range: Set within the range of 50 - 350 °C according to customer requirements; Temperature control accuracy: within ±3 °C; Gas pressure for use: within 5 KPa; No gas leakage at each connection point under a gas pressure of 5 KPa; Applicable gases: liquefied petroleum gas, natural gas, coal gas; Ambient temperature for use: -20 °C - 80 °C.

[0031] Initial state of normal operation: The temperature-sensitive composite bimetallic disc 62 bends towards the side of the middle-through inner tube 04 and presses against the reset rod 63. The first contact 64 on the reset rod 63 extends out of the nozzle of the middle-through inner tube 04 and contacts the connecting rod 55. At this time, the extending length of the first contact 64 is restricted by the limit block 66. Since the acting force of the first return spring 57 pressing the sealing ring 56 to reset the connecting rod 55 downward is less than the acting force of the temperature-sensitive composite bimetallic disc 62 acting on the reset rod 63 to push the connecting rod 55 upward, a gap is formed between the sealing ring 56 and the opening of the middle-through inner tube 04. The vent hole 58 on the opening of the middle-through inner tube 04 is communicated with the inside of the valve body 01, the inside of the valve body 01 is communicated with the air inlet 02, the vent hole 58 is communicated with the inside of the middle-through inner tube 04, and the middle-through inner tube 04 is communicated with the air outlet 03. Therefore, the air inlet 02 and the air outlet 03 are in a communicating state.

[0032] (2) Protective working state when the valve orifice of the combustion gas temperature control double protection valve is closed

[0033] When the equipment being used abnormally heats up to the set temperature of this valve body due to a fault, the temperature-sensitive working medium 09 filled in the temperature-sensitive probe 08 expands when heated. The temperature-sensitive working medium 09 enters the working medium cavity 53 of the diaphragm box part 51 through the capillary tube 07, causing the diaphragm 50 at the bottom of the diaphragm box part 51 to expand. The base 54, the connecting rod 55, and the sealing ring 56 as a whole generate a forward displacement, and at the same time, the reset rod 63 is also pushed forward. The temperature-sensitive composite bimetallic disc 62 turns backward under the action of the reset rod 63, and the whole process is completed in an instant. At this time, the sealing ring 56 blocks the vent hole 58 under the action of the first return spring 57. The vent hole 58 is not communicated with the inside of the valve body 01, and the air inlet 02 and the air outlet 03 are not communicated either. That is, the first protection valve core 05 closes the valve orifice, cuts off the gas source, and the externally associated equipment gets an immediate response.

[0034] For example: when the environment where the dual protection valve is installed is abnormal, or the equipment using the valve heats up abnormally, when the temperature exceeds the ambient temperature of 80°C, the temperature setting can be specified by the customer in any temperature range between 80°C and 110°C. When the temperature sensed by the temperature-sensitive composite bimetallic strip reaches the specified set temperature value, it automatically jumps back, the reset rod 63 falls, the valve port is closed, the gas source is cut off, and the equipment and environment are safely protected. Thus, the dual protection of the above two functions is realized. When the equipment is already in the protection state, the equipment needs to be safety checked and repaired. When the equipment is normal after repair, the manual reset device 14 of the protection valve needs to be manually pressed to reset it so that the protection valve returns to the open working state.

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

[0036] When the temperature-sensitive composite bimetal spring 62 bounces back under the action of the reset rod 63 , it is only necessary to press the push button 145 , and the fixing block 144 at the end of the push rod 143 will make the temperature-sensitive composite bimetal spring 62 bounce back and press against the reset rod 63 .

[0037] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present invention, which all belong to the protection scope of the invention.

Claims

1. A gas temperature limit protection valve, characterized in that, It includes a valve body with a central through hole, an air inlet and an air outlet respectively provided above and below the valve body, a central through inner tube communicating with the inner part of the valve body and the air outlet inside the valve body between the air inlet and the air outlet, a first-stage protection valve core provided on one side of the central through inner tube in the valve body, a second-stage protection valve core provided on the other side, a capillary tube connected to the first-stage protection valve core and extending from the inner part of the valve body to the outside, and a temperature sensing probe provided at the end of the capillary tube; The capillary tube and the temperature sensing probe are internally provided with a temperature sensing working medium communicating with each other; The central through inner tube communicates with the inner part of the valve body and the air outlet; The air inlet communicates with the inner part of the valve body; A gland for sealing the opening of the valve body is provided on the opening at one end of the valve body corresponding to the position of the first-stage protection valve core, and a valve cover for sealing the opening of the valve body is provided on the opening at one end of the valve body corresponding to the position of the second-stage protection valve core; The first-stage protection valve core includes a diaphragm box part provided on the gland corresponding to the opening position of the central through inner tube and extending from the inner part of the valve body to the outside and connected to the capillary tube, a nut for fixing the diaphragm box part on the gland, a working medium cavity provided inside the diaphragm box part and communicating with the temperature sensing working medium inside the capillary tube, a base provided on the diaphragm box part inside the valve body, a connecting rod provided on the base, a sealing ring provided at the end of the connecting rod, and a first return spring provided between the sealing ring and the diaphragm box part; A vent hole communicating with the inner part of the valve body is provided on the opening of the central through inner tube corresponding to the position of the sealing ring; The second-stage protection valve core includes a gap provided between the valve cover and the central through inner tube, a temperature sensing composite bimetallic spring piece provided in the gap and corresponding to the pipe orifice position of the central through inner tube, a reset rod provided inside the central through inner tube and extending in the direction of both ends of the central through inner tube respectively, a first contact provided at one end of the reset rod and extending to the pipe orifice position of the central through inner tube and contacting the connecting rod, and a second contact provided at the other end and contacting the temperature sensing composite bimetallic spring piece extending to the pipe orifice position of the central through inner tube; A limiting block for limiting the first contact is provided on the inner side of the pipe orifice of the central through inner tube between the first contact and the reset rod; 2. The gas temperature limit protection valve according to claim 1, wherein, A manual reset device is provided on the valve cover on one side of the temperature sensing composite bimetallic spring piece; The manual reset device includes a tube body extending outwardly provided on the valve cover on one side of the temperature sensing composite bimetallic spring piece, a trapezoidal groove communicating with the gap provided inside the tube body, a pressing rod extending into the gap provided in the trapezoidal groove, a fixing block contacting the temperature sensing composite bimetallic spring piece provided at one end of the pressing rod, a pressing button provided at the other end, and a second return spring provided between the pressing button in the trapezoidal groove and the inside of the tube body; 3. A gas temperature limit protection valve according to claim 1 or 2, characterized in that, The temperature sensing composite bimetallic spring piece is mainly composed of an arc-shaped composite metal disc; The bottom of the composite metal disc deforms backward after being acted on by the second contact; 4. The gas temperature limit protection valve according to claim 3, characterized in that, The range of the backward deformation of the bottom of the composite metal disc is between 0.27 mm and 1.25 mm; 5. The gas temperature limit protection valve according to claim 1, characterized in that, The composite metal disc is composed of a stainless steel layer and a nickel metal composite; 6. The gas temperature limit 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. The gas temperature limit protection valve according to claim 1, characterized in that, The applicable temperature environment of the temperature sensing probe is between 50°C and 350°C, and the applicable temperature environment of the temperature sensing composite bimetallic strip is between 80°C and 120°C.

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