A combustible gas monitoring valve automatic disconnection device

Abstract

The present invention relates to the technical field of gas alarms, and specifically to an automatic disconnection device for a combustible gas monitoring valve, comprising a pressure regulating assembly, an emergency shut-off valve, a main gas supply pipeline, a control valve, a three-way pipe, an emergency shut-off component, a monitoring component and a one-way vent pipe. The optical fiber sensing technology is adopted as a whole, and changes in the surrounding environment are detected by monitoring changes in light intensity during optical fiber transmission, so that trace amounts of combustible gas in the environment can be detected in a very short time, and an alarm and automatic shut-off valve action can be quickly triggered. In addition, a structure combining an automatic control system and a manual control system is adopted to ensure that the gas supply can be safely and effectively controlled under any circumstances.

Description

Technical Field

[0001] The invention relates to the technical field of gas alarms, in particular to an automatic disconnecting device for a combustible gas monitoring valve. Background Art

[0002] The combustible gas monitoring valve automatic disconnect device is an important safety device, which is mainly used to automatically cut off the gas supply after detecting combustible gas leakage to prevent fire or explosion accidents. As the main representative of combustible gas, natural gas is widely used in home kitchens, boiler rooms, gas thermal energy factory workshops, and gas supply network systems.

[0003] Most of the existing automatic disconnect devices for combustible gas monitoring valves use sensors with lower sensitivity, resulting in a longer time from leak detection to alarm, increasing the risk of accidents. In addition, although some devices have the function of automatically disconnecting the valve, they lack manual control options, resulting in difficulty in quickly restoring gas supply after problems occur in the automatic system, thus affecting the normal supply of gas. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides an automatic disconnecting device for a combustible gas monitoring valve, which adopts optical fiber sensing technology as a whole. It detects changes in the surrounding environment by monitoring changes in light intensity during optical fiber transmission, thereby being able to detect trace amounts of combustible gas in the environment in a very short time and quickly trigger an alarm and automatic valve shut-off action. In addition, it also adopts a structure that combines an automatic control system and a manual control system to ensure that the gas supply can be safely and effectively controlled under any circumstances.

[0005] The technical solution adopted by the present invention to solve the above technical problems is: a combustible gas monitoring valve automatic disconnection device, including a pressure regulating assembly, the outlet pipeline of the pressure regulating assembly is sealed with an emergency cut-off valve, the side of the emergency cut-off valve away from the pressure regulating assembly is fixedly installed with a main air supply pipeline, the side of the main air supply pipeline away from the emergency cut-off valve is sealed with a control valve, the side of the control valve away from the main air supply pipeline is fixedly installed with a three-way pipe, an emergency cut-off component is arranged above the emergency cut-off valve, the lower end of the emergency cut-off component is respectively fixedly installed on the outlet pipeline of the pressure regulating assembly and the main air supply pipeline, a monitoring component is fixedly arranged on the outside of the control valve, and the emergency cut-off component is connected with the inside of the monitoring component through a one-way ventilation pipe;

[0006] The described emergency cut-off assembly includes a U-shaped plate. A U-shaped plate is arranged above the emergency cut-off valve. The U-shaped plate has an opening facing downwards, and the lower ends of the U-shaped plate are respectively fixedly installed on the outlet pipeline of the pressure regulating assembly and the main air supply pipeline. A valve rod driving unit is slidably penetrated through the middle of the upper end surface of the U-shaped plate. A U-shaped rack is fitted on the side of the valve rod driving unit. The opening of the U-shaped rack faces the valve rod driving unit, and limiting sliding grooves are symmetrically formed on the two outer side walls of the U-shaped rack. A limiting unit is fixedly arranged on the side wall of the U-shaped plate. The limiting unit is fixedly connected to the U-shaped rack. An electric push rod is fixedly installed on the inner side wall of one side of the U-shaped plate. The telescopic end of the electric push rod abuts against the limiting sliding groove on one side of the U-shaped rack. A controller is installed on the upper end surface of the U-shaped plate and near the electric push rod. The controller is electrically connected to the electric push rod. An air blowing unit is arranged on the side wall of the U-shaped plate far from the electric push rod. One end of the air blowing unit abuts against the limiting sliding groove on the side of the U-shaped rack, and the other end of the air blowing unit is communicated with the inside of the monitoring assembly through a one-way air pipe.

[0007] Preferably, a "plum blossom" groove is formed at the upper end of the valve rod of the emergency cut-off valve.

[0008] Preferably, support frames are linearly arranged at the lower end of the main air supply pipeline.

[0009] Preferably, the valve rod driving unit includes a driving shaft. The driving shaft is slidably penetrated through the middle of the upper end surface of the U-shaped plate. A driven gear is fixedly installed in the middle of the driving shaft. The driven gear meshes with the U-shaped rack. The upper end of the driving shaft is fixedly connected with an end shaft retaining disc. A reset handle is fixedly installed in the middle of the upper end surface of the end shaft retaining disc. Wear-resistant protrusions are symmetrically installed on the lower end surface of the end shaft retaining disc.

[0010] Preferably, a limiting block that cooperates with the "plum blossom" groove is fixedly connected to the lower end of the driving shaft.

[0011] Preferably, top position protrusions are symmetrically installed below the end shaft retaining disc and away from the wear-resistant protrusions. The lower ends of the top position protrusions are fixedly connected to the U-shaped plate, and the upper ends of the top position protrusions are in sliding contact with the lower end of the end shaft retaining disc.

[0012] Preferably, the limiting unit includes a support side plate. The support side plate is fixedly connected to the side wall of the U-shaped plate. A strip-shaped limiting through groove is formed in the middle of the support side plate. T-shaped limiting rods are symmetrically and slidably arranged in the strip-shaped limiting through groove. One end of each T-shaped limiting rod is fixedly connected to the side wall of the U-shaped rack, and the other end of each T-shaped limiting rod extends to the outside of the support side plate. A spiral spring is sleeved on the T-shaped limiting rod between the support side plate and the U-shaped rack. A handle is fixedly installed between the two T-shaped limiting rods.

[0013] Preferably, the air inflation unit includes a cylinder. The cylinder is fixedly installed on the side wall of the C-shaped plate away from the electric push rod. A T-shaped piston rod is slidably installed in the middle of the cylinder. The end of the T-shaped piston rod away from the cylinder is a spherical head structure and abuts against the limit chute on the side of the C-shaped rack. A compression spring is sleeved on the T-shaped piston rod between the C-shaped rack and the cylinder. A one-way intake valve is installed on the upper end surface of the cylinder near the one-way air pipe. The air outlet of the cylinder is connected to the inside of the monitoring component through the one-way air pipe.

[0014] Preferably, the monitoring component includes a detachable sealed box. The detachable sealed box is arranged outside the control valve. The two ends of the detachable sealed box are respectively and hermetically connected to the main air supply pipeline and the three-way pipe. A fiber optic sensor is fixedly installed on the inner top of the detachable sealed box. A photodetector is fixedly installed in the middle of the upper end surface of the detachable sealed box. The photodetector is connected to the controller by electrical connection. The fiber optic sensor is connected to the photodetector through a wire. An alarm lamp is electrically connected to the middle of the upper end of the photodetector.

[0015] Preferably, the detachable sealed box is made of a transparent material.

[0016] Advantages of the present invention:

[0017] 1. The monitoring component provided by the present invention can monitor the change of light intensity in the optical fiber transmission process in real time through the fiber optic sensing technology, so as to detect trace amounts of combustible gas in the environment in a very short time and quickly trigger an alarm. The detection time is short and the alarm is rapid, which is beneficial for the staff to quickly take rescue measures.

[0018] 2. The monitoring component provided by the present invention can control the emergency cut-off component to automatically perform the valve closing action by means of an electric signal after leakage. The automatic control system and the manual control system are combined to ensure that the gas supply can be safely and effectively controlled under any circumstances, and the gas recovery efficiency is improved.

[0019] 3. The emergency cut-off component provided by the present invention can continuously introduce external air into the environment around the leakage point after leakage, so as to quickly reduce the concentration of combustible gas and reduce the probability of accidents. Brief Description of the Drawings

[0020] The present invention will be further described below with reference to the drawings and embodiments.

[0021] Figure 1 is a three-dimensional structural schematic diagram of the present invention;

[0022] Figure 2 is in the present invention Figure 1 The three-dimensional structural schematic diagram after removing the pressure regulating assembly;

[0023] Figure 3 It is a schematic diagram of the three-dimensional connection structure among the emergency cut-off valve, the main air supply pipeline and the emergency cut-off assembly in the present invention;

[0024] Figure 4 In the present invention Figure 3 Another perspective three-dimensional structure schematic diagram;

[0025] Figure 5 In the present invention Figure 3 Enlarged structure schematic diagram at position A;

[0026] Figure 6 In the present invention Figure 4 Enlarged structure schematic diagram at position B;

[0027] Figure 7 In the present invention Figure 3 Enlarged structure schematic diagram at position C;

[0028] Figure 8 It is a schematic diagram of the three-dimensional structure between the emergency cut-off valve and the valve stem drive unit in the present invention;

[0029] Fig. 9 It is a schematic diagram of the three-dimensional connection structure among the main air supply pipeline, the control valve, the three-way pipe, the monitoring assembly and the one-way air pipe in the present invention.

[0030] In the figure:

[0031] 1, pressure regulating assembly; 2, emergency cut-off valve; 21, "plum blossom" groove; 3, main air supply pipeline; 31, support frame; 4, control valve; 5, three-way pipe;

[0032] 6, emergency cut-off assembly; 61, C-shaped plate;

[0033] 62, valve stem drive unit; 621, drive shaft; 6211, limit block; 622, driven gear; 623, shaft end retaining disc; 6231, top position protrusion; 624, reset handle; 625, wear-resistant protrusion;

[0034] 63, C-shaped rack;

[0035] 64, limit unit; 641, support side plate; 642, strip-shaped limit through groove; 643, T-shaped limit rod; 644, helical spring; 645, handle;

[0036] 65, electric push rod; 66, controller;

[0037] 67, air inflation unit; 671, air cylinder; 672, T-shaped piston rod; 673, extrusion spring; 674, one-way intake valve;

[0038] 7. Monitoring components; 71. Removable sealed box; 72. Optical fiber sensor; 73. Photoelectric detector; 74. Alarm light;

[0039] 8. One-way ventilation pipe. DETAILED DESCRIPTION

[0040] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0041] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0042] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0043] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0044] Embodiment 1:

[0045] See also Figures 1 to 4 as well as Figure 8 and Fig. 9 A combustible gas monitoring valve automatic disconnection device comprises a pressure regulating assembly 1, wherein the outlet pipeline of the pressure regulating assembly 1 is sealed with an emergency shut-off valve 2, a main air supply pipeline 3 is fixedly installed on the side of the emergency shut-off valve 2 away from the pressure regulating assembly 1, a control valve 4 is sealed with the side of the main air supply pipeline 3 away from the emergency shut-off valve 2, and a three-way pipe 5 is fixedly installed on the side of the control valve 4 away from the main air supply pipeline 3.

[0046] In this embodiment, a "plum blossom" groove 21 is provided at the upper end of the valve stem of the emergency shut-off valve 2 .

[0047] A support frame 31 is linearly arranged at the lower end of the main air supply pipeline 3 .

[0048] During actual operation, first, one end of the emergency cut-off valve 2 is hermetically installed with the outlet pipeline of the pressure regulating assembly 1 manually, and then the other end of the emergency cut-off valve 2 is connected to the main gas supply pipeline 3. Subsequently, the end of the main gas supply pipeline 3 far from the emergency cut-off valve 2 is connected to the tee 5 by using the control valve 4, thus forming a complete natural gas transmission pipeline. Then, the control valve 4 is opened, and the natural gas in the base station is regulated by the pressure regulating assembly 1 and then transported successively through the emergency cut-off valve 2, the main gas supply pipeline 3, the control valve 4, and the tee 5, and then transported to each main pipeline, thereby realizing the normal transmission function of natural gas.

[0049] Embodiment 2:

[0050] Refer to Figures 3 to 9 , which is basically the same as the technical solution of Embodiment 1, except that: an emergency cut-off assembly 6 is arranged above the emergency cut-off valve 2. The lower end of the emergency cut-off assembly 6 is fixedly installed on the outlet pipeline of the pressure regulating assembly 1 and the main gas supply pipeline 3 respectively. A monitoring assembly 7 is fixedly arranged outside the control valve 4. The emergency cut-off assembly 6 is connected to the inside of the monitoring assembly 7 through a one-way ventilation pipe 8.

[0051] The emergency cut-off assembly 6 includes a C-shaped plate 61. A C-shaped plate 61 is arranged above the emergency cut-off valve 2. The C-shaped plate 61 has an opening facing downwards, and the lower end of the C-shaped plate 61 is fixedly installed on the outlet pipeline of the pressure regulating assembly 1 and the main gas supply pipeline 3 respectively. A valve rod driving unit 62 is slidably penetrated through the middle of the upper end surface of the C-shaped plate 61. A C-shaped rack 63 is installed in cooperation with the side of the valve rod driving unit 62. The C-shaped rack 63 has an opening facing the valve rod driving unit 62, and limiting sliding grooves are symmetrically formed on the two outer side walls of the C-shaped rack 63. A limiting unit 64 is fixedly arranged on the side wall of the C-shaped plate 61, and the limiting unit 64 is fixedly connected to the C-shaped rack 63. An electric push rod 65 is fixedly installed on the inner side wall of one side of the C-shaped plate 61. The telescopic end of the electric push rod 65 abuts against the limiting sliding groove on one side of the C-shaped rack 63. A controller 66 is installed on the upper end surface of the C-shaped plate 61 and close to the electric push rod 65. The controller 66 is connected to the electric push rod 65 in an electrically connected manner. A gas blowing unit 67 is arranged on the side wall of the C-shaped plate 61 far from the electric push rod 65. One end of the gas blowing unit 67 abuts against the limiting sliding groove on the side of the C-shaped rack 63, and the other end of the gas blowing unit 67 is connected to the inside of the monitoring assembly 7 through a one-way ventilation pipe 8.

[0052] In this embodiment, the valve rod driving unit 62 includes a driving shaft 621. The driving shaft 621 is slidably penetrated through the middle of the upper end surface of the C-shaped plate 61. A driven gear 622 is fixedly installed in the middle of the driving shaft 621. The driven gear 622 meshes with the C-shaped rack 63. The upper end of the driving shaft 621 is fixedly connected with an end shaft retaining disc 623. A reset handle 624 is fixedly installed in the middle of the upper end surface of the end shaft retaining disc 623. Wear-resistant protrusions 625 are symmetrically installed on the lower end surface of the end shaft retaining disc 623.

[0053] Further, a limit block 6211 that cooperates with the "plum blossom" groove 21 is fixedly connected to the lower end of the drive shaft 621.

[0054] Below the shaft end retaining disc 623 and at a position far from the wear-resistant protrusion 625, top position protrusions 6231 are symmetrically installed. The lower end of the top position protrusion 6231 is fixedly connected to the C-shaped plate 61, and the upper end of the top position protrusion 6231 is in sliding contact with the lower end of the shaft end retaining disc 623.

[0055] The limiting unit 64 includes a support side plate 641. The support side plate 641 is fixedly connected to the side wall of the C-shaped plate 61. A strip-shaped limiting through groove 642 is formed in the middle of the support side plate 641. T-shaped limiting rods 643 are symmetrically and slidably arranged in the strip-shaped limiting through groove 642. One end of the T-shaped limiting rod 643 is fixedly connected to the side wall of the C-shaped rack 63, and the other end of the T-shaped limiting rod 643 extends to the outside of the support side plate 641. A spiral spring 644 is sleeved on the T-shaped limiting rod 643 between the support side plate 641 and the C-shaped rack 63. A handle 645 is fixedly installed between the two T-shaped limiting rods 643.

[0056] The air blowing unit 67 includes an air cylinder 671. The air cylinder 671 is fixedly installed on the side wall of the C-shaped plate 61 away from the electric push rod 65. A T-shaped piston rod 672 is slidably installed in the middle of the air cylinder 671. The end of the T-shaped piston rod 672 away from the air cylinder 671 is in a spherical head structure and abuts against the limiting sliding groove on the side of the C-shaped rack 63. A compression spring 673 is sleeved on the T-shaped piston rod 672 between the C-shaped rack 63 and the air cylinder 671. A one-way intake valve 674 is installed on the upper end surface of the air cylinder 671 and near the one-way ventilation pipe 8. The air outlet of the air cylinder 671 is connected to the inside of the monitoring component 7 through the one-way ventilation pipe 8.

[0057] It should be noted that in this embodiment, a concave groove is formed in the middle of the upper end of the top position protrusion 6231. The purpose is that when the wear-resistant protrusion 625 moves to the top of the top position protrusion 6231, the top position protrusion 6231 can play a certain limiting role on the wear-resistant protrusion 625, so as to ensure the overall stability of the valve rod driving unit 62.

[0058] During specific operation, during the normal transmission of natural gas, if an emergency occurs, the controller 66 will control the electric push rod 65 to start. By pushing the C-shaped rack 63 through the electric push rod 65, under the action of the driven gear 622, the drive shaft 621 will drive the limit block 6211 and the emergency cut-off valve 2 to rotate, so as to achieve the purpose of quickly cutting off the transmission of natural gas;

[0059] During the rotation of the drive shaft 621, it drives the shaft-end retaining disc 623, the reset handle 624, and the wear-resistant protrusion 625 to rotate synchronously. When the wear-resistant protrusion 625 rotates to contact the top-position protrusion 6231, with the continuous rotation of the drive shaft 621, the extrusion of the top-position protrusion 6231 on the wear-resistant protrusion 625 drives the wear-resistant protrusion 625, the shaft-end retaining disc 623, the reset handle 624, and the drive shaft 621 to move upward. At this time, the driven gear 622 disengages from the C-shaped rack 63, and at the same time, the limit block 6211 at the lower end of the drive shaft 621 disengages from the "plum blossom" groove 21 on the valve stem of the emergency cut-off valve 2. At this time, the emergency cut-off valve 2 is in the closed state, and the natural gas inside the main gas supply pipeline 3 is no longer continuously transported;

[0060] During the process of the electric push rod 65 pushing the C-shaped rack 63 to move, the C-shaped rack 63 squeezes the T-shaped piston rod 672 and drives the compression spring 673 to compress, thereby sending the air inside the air cylinder 671 into the monitoring component 7 through the one-way ventilation pipe 8, thereby reducing the concentration of natural gas inside the monitoring component 7, so as to reduce the danger during the maintenance of the maintenance personnel. When the driven gear 622 disengages from the C-shaped rack 63, the movement mode of the extending end of the electric push rod 65 is a left-right reciprocating movement, thereby continuously squeezing air into the monitoring component 7;

[0061] When the control valve 4 is repaired, first manually pull the handle 645 outward, drive the T-shaped limit rod 643 and the C-shaped rack 63 to move to the side through the handle 645. At this time, the spiral spring 644 is compressed. Then hold the reset handle 624 and drive the shaft-end retaining disc 623 and the drive shaft 621 to rotate. When the wear-resistant protrusion 625 disengages from the top of the top-position protrusion 6231, lower the reset handle 624 so that the limit block 6211 at the lower end of the drive shaft 621 is inserted back into the "plum blossom" groove 21 on the valve stem of the emergency cut-off valve 2. Then release the handle 645, and drive the C-shaped rack 63 to re-engage with the driven gear 622 through the reaction force of the spiral spring 644. Then drive the C-shaped rack 63 to move through the electric push rod 65, thereby driving the emergency cut-off valve 2 to open again. At this time, the natural gas is transported normally again. If the controller 66 and the electric push rod 65 are damaged and cannot operate normally, manually rotate the reset handle 624 before releasing the handle 645, and the emergency cut-off valve 2 can also be opened again.

[0062] The monitoring component 7 includes a detachable sealed box 71. The detachable sealed box 71 is arranged on the outside of the control valve 4. The two ends of the detachable sealed box 71 are sealed and connected to the main air supply pipeline 3 and the three-way pipe 5 respectively. An optical fiber sensor 72 is fixedly installed on the top of the inner side of the detachable sealed box 71. A photoelectric detector 73 is fixedly installed in the middle of the upper end surface of the detachable sealed box 71. The photoelectric detector 73 is connected to the controller 66 by electrical connection. The optical fiber sensor 72 is connected to the photoelectric detector 73 through a wire. The middle of the upper end of the photoelectric detector 73 is electrically connected to an alarm light 74. The detachable sealed box 71 is made of transparent material.

[0063] In this embodiment, the alarm light 74 is used in conjunction with a remote monitoring device, and the remote monitoring device can monitor the status of the alarm light 74 in real time, thereby facilitating maintenance personnel to respond quickly.

[0064] During specific operation, during the normal transportation of natural gas, the position most prone to leakage is the control valve 4, and the detachable sealing box 71 can play a certain protective role on the control valve 4, thereby extending its service life. When it leaks, the natural gas will diffuse into the detachable sealing box 71. At this time, the natural gas will affect the optical fiber signal inside the optical fiber sensor 72 and change the refractive index of the optical fiber. This change in refractive index will further cause a change in light intensity, and the photoelectric detector 73 can monitor the light intensity in real time. When the light intensity changes, the photoelectric detector 73 will quickly capture the changes before and after, thereby converting the changes into electrical signals and transmitting them to the controller 66, thereby controlling the operation of the electric push rod 65 through the controller 66, and the alarm light 74 will light up at the same time. At this time, the maintenance personnel can respond quickly, thereby improving the maintenance efficiency.

[0065] The working principle of the present invention when in use:

[0066] One: First, manually seal and install one end of the emergency shut-off valve 2 and the outlet pipeline of the pressure regulating assembly 1, then connect the other end of the emergency shut-off valve 2 to the main gas supply pipeline 3, and then use the control valve 4 to connect the end of the main gas supply pipeline 3 away from the emergency shut-off valve 2 and the three-way pipe 5, so as to form a complete natural gas transmission pipeline, and then open the control valve 4, and regulate the pressure of the natural gas in the base station through the pressure regulating assembly 1, and then transmit it through the emergency shut-off valve 2, the main gas supply pipeline 3, the control valve 4 and the three-way pipe 5 in turn, and then transmit it to each trunk pipeline, so as to realize the normal transmission function of natural gas;

[0067] Second: During the normal transmission of natural gas, the most prone position to leakage is the control valve 4, and the detachable seal box 71 can play a certain protective role for the control valve 4, thus extending its service life. When leakage occurs, natural gas will diffuse into the detachable seal box 71. At this time, the natural gas will affect the optical fiber signal inside the optical fiber sensor 72 and cause the refractive index of the optical fiber to change. This change in refractive index will further cause a change in light intensity, and the photoelectric detector 73 can monitor the light intensity in real time. When the light intensity changes, the photoelectric detector 73 will quickly capture the change before and after, and then convert this change into an electrical signal and transmit it to the controller 66, so as to control the operation of the electric push rod 65 through the controller 66. At the same time, the alarm lamp 74 will light up. At this time, the maintenance personnel can quickly make a response, thus improving the maintenance efficiency;

[0068] Third: After the controller 66 controls the electric push rod 65 to start, the electric push rod 65 is used to push the C-shaped rack 63 to move. Under the action of the driven gear 622, the drive shaft 621 will drive the limit block 6211 and the emergency cut-off valve 2 to rotate, so as to achieve the purpose of quickly cutting off the natural gas transmission;

[0069] Fourth: During the rotation of the drive shaft 621, the shaft end disc 623, the reset handle 624 and the wear-resistant protrusion 625 will rotate synchronously. When the wear-resistant protrusion 625 rotates to contact the top protrusion 6231, as the drive shaft 621 continues to rotate, the extrusion of the top protrusion 6231 on the wear-resistant protrusion 625 will drive the wear-resistant protrusion 625, the shaft end disc 623, the reset handle 624 and the drive shaft 621 to move upward. At this time, the driven gear 622 will disengage from the C-shaped rack 63, and at the same time, the limit block 6211 at the lower end of the drive shaft 621 will disengage from the "plum blossom" groove 21 on the valve stem of the emergency cut-off valve 2. At this time, the emergency cut-off valve 2 is in the closed state, and the natural gas inside the main gas pipeline 3 will no longer be transported;

[0070] Fifth: During the process of the electric push rod 65 pushing the C-shaped rack 63 to move, the C-shaped rack 63 will squeeze the T-shaped piston rod 672 and drive the compression spring 673 to compress, so as to send the air inside the air cylinder 671 into the detachable seal box 71 through the one-way ventilation pipe 8, thereby increasing the concentration of natural gas inside the detachable seal box 71, so as to reduce the danger for maintenance personnel during maintenance. After the driven gear 622 disengages from the C-shaped rack 63, the movement mode of the extending end of the electric push rod 65 is left-right reciprocating movement, so as to continuously squeeze the air into the detachable seal box 71, and then achieve the purpose of quickly reducing the concentration of natural gas inside the detachable seal box 71;

[0071] VI: After the maintenance of the control valve 4 is completed, first manually pull the handle 645 outwards. The T-shaped limit rod 643 and the C-shaped rack 63 are driven by the handle 645 to move towards the side. At this time, the spiral spring 644 is compressed. Then hold the reset handle 624 and drive the shaft end retaining disc 623 and the drive shaft 621 to rotate. When the wear-resistant protrusion 625 disengages from the top of the top position protrusion 6231, lower the reset handle 624 so that the limit block 6211 at the lower end of the drive shaft 621 is inserted back into the "plum blossom" groove 21 on the valve stem of the emergency cut-off valve 2. Then release the handle 645, and the C-shaped rack 63 is driven by the reaction force of the spiral spring 644 to engage with the driven gear 622 again. Then drive the C-shaped rack 63 to move through the electric push rod 65, thereby driving the emergency cut-off valve 2 to open again. At this time, the natural gas continues to be transported normally. If the controller 66 and the electric push rod 65 are damaged and cannot operate normally, manually rotate the reset handle 624 before releasing the handle 645 to also open the emergency cut-off valve 2 manually.

[0072] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions in the specification only illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of protection required by the present invention. The scope of protection required by the present invention is defined by the appended claims and their equivalents.

Claims

1. A combustible gas monitoring valve automatic disconnection device, comprising a pressure regulating assembly (1). An emergency cut-off valve (2) is hermetically installed on the outlet pipeline of the pressure regulating assembly (1). A main gas supply pipeline (3) is fixedly installed on one side of the emergency cut-off valve (2) away from the pressure regulating assembly (1). An emergency cut-off assembly (6) is arranged above the emergency cut-off valve (2), and its characteristics are as follows: The emergency cut-off assembly (6) includes: A U-shaped plate (61). A U-shaped plate (61) is arranged above the emergency cut-off valve (2). The U-shaped plate (61) has an opening facing downwards, and the lower ends of the U-shaped plate (61) are respectively fixedly installed on the outlet pipeline of the pressure regulating assembly (1) and the main gas supply pipeline (3); A valve stem driving unit (62). The valve stem driving unit (62) includes a driving shaft (621). The driving shaft (621) slidably penetrates through the middle of the upper end surface of the U-shaped plate (61). A driven gear (622) is fixedly installed in the middle of the driving shaft (621). A limit block (6211) is fixedly connected to the lower end of the driving shaft (621); A U-shaped rack (63) is cooperatively installed on the side of the valve stem driving unit (62); An electric push rod (65) is fixedly installed on the inner side wall of one side of the U-shaped plate (61). The telescopic end of the electric push rod (65) abuts against the inside of the U-shaped rack (63); A controller (66). A controller (66) is installed on the upper end surface of the U-shaped plate (61) and close to the electric push rod (65). The controller (66) is connected to the electric push rod (65) by electrical connection; The driven gear (622) meshes with the U-shaped rack (63). A shaft end retaining disc (623) is fixedly connected to the upper end of the driving shaft (621). A reset handle (624) is fixedly installed in the middle of the upper end surface of the shaft end retaining disc (623). Wear-resistant protrusions (625) are symmetrically installed on the lower end surface of the shaft end retaining disc (623); Below the shaft end retaining disc (623) and at a position away from the wear-resistant protrusions (625), top position protrusions (6231) are symmetrically installed. The lower ends of the top position protrusions (6231) are fixedly connected to the U-shaped plate (61). The upper ends of the top position protrusions (6231) are in sliding contact with the lower end of the shaft end retaining disc (623).

2. The combustible gas monitoring valve automatic disconnection device according to claim 1, and its characteristics are as follows: The emergency cut-off assembly (6) further includes: A limiting unit (64). The limiting unit (64) is fixedly arranged on the side wall of the U-shaped plate (61). The limiting unit (64) is fixedly connected to the U-shaped rack (63); An air-blowing unit (67). An air-blowing unit (67) is arranged on the side wall of the U-shaped plate (61) away from the electric push rod (65). One end of the air-blowing unit (67) abuts against the limiting chute on the side of the U-shaped rack (63). The other end of the air-blowing unit (67) is connected to the inside of the monitoring assembly (7) through a one-way ventilation pipe (8).

3. The combustible gas monitoring valve automatic disconnection device according to claim 1, characterized in that: A "plum blossom" groove (21) is opened at the upper end of the valve stem of the emergency cut-off valve (2).

4. The combustible gas monitoring valve automatic disconnection device according to any one of claims 1 to 3, characterized in that: Support frames (31) are linearly arranged at the lower end of the main gas supply pipeline (3).

5. The combustible gas monitoring valve automatic disconnection device according to claim 2, characterized in that: The described limiting unit (64) includes a supporting side plate (641). A strip-shaped limiting through groove (642) is formed in the middle of the supporting side plate (641). T-shaped limiting rods (643) are symmetrically and slidably arranged in the strip-shaped limiting through groove (642). A spiral spring (644) is sleeved on the T-shaped limiting rods (643) between the supporting side plate (641) and the C-shaped rack (63).

6. The combustible gas monitoring valve automatic disconnection device according to claim 5, characterized in that: The described air inflation unit (67) includes an air cylinder (671). A T-shaped piston rod (672) is slidably installed in the middle of the air cylinder (671). An extrusion spring (673) is sleeved on the T-shaped piston rod (672) between the C-shaped rack (63) and the air cylinder (671). A one-way intake valve (674) is installed on the upper end face of the air cylinder (671) and close to the one-way ventilation pipe (8).

7. The combustible gas monitoring valve automatic disconnection device according to claim 2, characterized in that: The described monitoring assembly (7) includes a detachable sealed box (71). An optical fiber sensor (72) is fixedly installed on the inner top of the detachable sealed box (71). A photodetector (73) is fixedly installed in the middle of the upper end face of the detachable sealed box (71). The photodetector (73) is connected to the controller (66) by electrical connection. The optical fiber sensor (72) is connected to the photodetector (73) by a wire. An alarm lamp (74) is electrically connected to the middle of the upper end of the photodetector (73).

8. The combustible gas monitoring valve automatic disconnection device according to claim 7, characterized in that: The described detachable sealed box (71) is made of a transparent material.

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