Two-way damper for signal pipe of self-operated stop valve

Abstract

The utility model relates to the technical field of safety of direct combustion equipment, in particular to a bidirectional damper for a signal pipe of a self-operated stop valve. Comprising a valve body which is a bidirectional damping external enclosure shell; the damping valve element is used for controlling and cutting off the airflow passing amount in the signal pipe or cutting off airflow; screw rods are arranged at the two ends of the damping valve core; an annular structure matched with the damping valve element is arranged in the middle of the valve body. The damping spring is arranged on the screw rod in a sleeving manner and is used for providing bidirectional damping stress when the airflow fluctuates instantaneously in a large flow / large pressure manner; the two adjusting nuts are arranged on the screw rods at the two ends in a sleeving mode respectively, and the adjusting nuts are located on the outer sides of the damping springs and used for adjusting the pressing degree of the damping springs; and the O-shaped ring is arranged between the damping valve core and the annular structure. The device is small in size, reliable in performance and convenient to install, and due functions of the pressure regulating device are not affected.

Description

Technical Field

[0001] The utility model relates to the technical field of direct-fired equipment safety, in particular to a two-way damping of a self-operated shut-off valve signal pipe. Background Art

[0002] The description of the background technology in this utility model belongs to the related technology related to the utility model, which is only used to illustrate and facilitate the understanding of the content of the utility model, and should not be understood as the applicant explicitly believing or inferring that the applicant believes that it is the prior art on the filing date of the first application of the utility model.

[0003] When the direct-fired equipment is shut down, the gas supply pipeline is instantly cut off due to overpressure, causing the direct-fired equipment to be unable to work continuously. To ensure the safety of gas supply, when the medium and low pressure gas pressure regulating devices are working normally, the general ultra-high pressure cut-off pressure is 1.5-1.8 times the outlet working pressure.

[0004] In the working environment of gas air conditioners or gas boilers, the inlet natural gas pressure increases rapidly and significantly due to the instantaneous shut-off of the solenoid valve when it is deactivated, resulting in frequent shut-off of the shut-off valve in the front-end pressure regulating equipment, causing the system to malfunction. Utility Model Content

[0005] The purpose of the embodiment of the utility model is to provide a self-operated shut-off valve signal pipe bidirectional damping device, which has the advantages of small size, reliable performance, easy installation, and does not affect the function of the pressure regulating device.

[0006] The purpose of this utility model is achieved through the following technical solutions:

[0007] A self-operated shut-off valve signal pipe bidirectional damping device, comprising:

[0008] Valve body, the valve body is an external enclosure shell with bidirectional damping;

[0009] The damping valve core is used to control the flow rate of the airflow in the cut-off signal pipe or to cut off the airflow; the two ends of the damping valve core are screws; the middle part of the valve body has an annular structure that cooperates with the damping valve core;

[0010] The damping spring is sleeved on the screw and is used to provide bidirectional damping stress when the airflow experiences instantaneous large flow rate / large pressure fluctuations;

[0011] Adjusting nuts, two adjusting nuts are respectively sleeved on the screws at both ends, and the adjusting nuts are located outside the damping spring and are used to adjust the compression degree of the damping spring;

[0012] The O-ring is arranged between the damping valve core and the annular structure.

[0013] Furthermore, a gap of 1.5-2.5 mm is left between the damping valve core and the annular structure.

[0014] Furthermore, the damping spring is in a slightly compressed state.

[0015] Furthermore, the bidirectional damping length of the self-operated shut-off valve signal tube is 70 mm, and the valve body is made of a hexagonal copper rod with opposite sides of 24 mm.

[0016] Furthermore, the damping valve core is an arrow-shaped damping valve core with M5 screws at both ends.

[0017] Furthermore, the O-ring is made of rubber.

[0018] By means of the above solution, the present invention has at least the following beneficial effects:

[0019] This device not only ensures the normal and continuous operation of direct-fired equipment, but also ensures the safety of gas supply. This device has the advantages of small size, reliable performance, easy installation, and does not affect the function of the pressure regulating device. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solution of the present invention, the following is a brief introduction to the drawings required for describing the embodiments:

[0021] Figure 1 This is a structural diagram of the bidirectional damping of the signal pipe of the self-operated shut-off valve;

[0022] Figure 2 This is another structural diagram of the bidirectional damping of the self-operated shut-off valve signal pipe;

[0023] Figure 3 Schematic diagram of the working principle of the bidirectional damping device of the shut-off valve signal pipe. DETAILED DESCRIPTION

[0024] The present invention will be further described in detail below in conjunction with the embodiments. It should be understood that the embodiments are intended to make it easier for those skilled in the art to understand the technical solutions of the present invention, and cannot be used as a limitation on the scope of protection of the present invention.

[0025] In the following description, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. The following description provides multiple embodiments of the present invention, and different embodiments can be replaced or combined, so the present invention can also be considered to include all possible combinations of the same and / or different embodiments described. Therefore, if one embodiment includes features A, B, and C, and another embodiment includes features B and D, then the present invention should also be considered to include embodiments containing one or more of all other possible combinations of A, B, C, and D, even though such embodiments may not be explicitly described in the following text.

[0026] The utility model is a two-way damping device for a cut-off valve signal pipe to prevent the direct-fired equipment from being unable to work continuously due to the instantaneous overpressure cut-off of the gas supply pipeline when the direct-fired equipment stops.

[0027] To ensure the safety of gas supply, when the medium and low pressure gas pressure regulating devices are working normally, the ultra-high pressure cut-off pressure is generally 1.5-1.8 times the outlet working pressure.

[0028] When a gas air conditioner or gas boiler is operating, the momentary shutoff of the solenoid valve during deactivation can cause a rapid and substantial increase in the inlet natural gas pressure. This can lead to frequent tripping of the shutoff valve in the front-end pressure regulating equipment, causing the system to malfunction. To address this malfunction, a bidirectional damping device for the shutoff valve signal pipe has been invented.

[0029] Combined with attachment Figure 1 and 2 , a self-operated shut-off valve signal pipe bidirectional damping, comprising:

[0030] Valve 1, the valve body is an external enclosure shell with two-way damping;

[0031] The damping valve core 4 is used to control the flow rate of the airflow in the cut-off signal pipe or to cut off the airflow; the two ends of the damping valve core are screws; the middle part of the valve body has an annular structure that cooperates with the damping valve core;

[0032] The damping spring 5 is sleeved on the screw and is used to provide bidirectional damping stress when the air flow experiences instantaneous large flow / large pressure fluctuations; the damping springs at both ends of the valve core initially position the valve core in a position that ensures bidirectional ventilation. At the same time, its slight spring pressure difference will not have any effect on the closing of the valve core under reverse pressure.

[0033] Adjusting nut 2, two adjusting nuts are respectively sleeved on the screws at both ends, and the adjusting nut is located outside the damping spring and is used to adjust the compression degree of the damping spring;

[0034] The O-ring 3 is arranged between the damping valve core and the annular structure.

[0035] This device features a compact size, reliable performance, and easy installation without compromising the voltage regulator's functionality. Its structure is simple and reliable: the entire device consists of four components, totaling six, offering an extremely simple mechanism, reliable performance, and a low failure rate. Adjusting the device is as simple as adjusting two adjusting nuts.

[0036] In some embodiments of the present invention, a gap of 1.5-2.5 mm is left between the damping valve core and the annular structure.

[0037] In some embodiments of the present invention, the damping spring is in a slightly compressed state.

[0038] In some embodiments of the present invention, the self-operated shut-off valve signal tube with bidirectional damping is 70 mm long, and the valve body is made of a hexagonal copper rod with opposite sides of 24 mm. Compact size: This device is 70 mm long, and the valve body is made of a hexagonal copper rod with opposite sides of 24 mm. After installation, it does not affect the overall layout and operational performance of the pressure regulating equipment.

[0039] In some embodiments of the present invention, the damping valve core is an arrowhead-shaped damping valve core with M5 screws at both ends. This ensures bidirectional airflow in the initial state and effectively closes the valve port under reverse pressure in the event of downstream overpressure. It also provides a fastening and adjustment screw for the adjustment nut. Installation is simple: the entire device has only G1 / 2 internal inlet and outlet threads, making installation simple and convenient.

[0040] In some embodiments of the present invention, the O-ring is made of rubber.

[0041] Normal working state of medium and low pressure gas pressure regulating device

[0042] During normal operation, the inlet pressure of the medium and low pressure gas pressure regulating device is P1, the outlet working pressure is set to P2, and the ultra-high pressure cut-off pressure of the cut-off valve is generally set to Pts=1.5-1.8P2.

[0043] When the pressure regulator fails and the downstream pressure slowly rises to greater than Pts, the shut-off valve cuts off the gas supply to ensure safety.

[0044] Medium and low pressure gas pressure regulating device is in working state when gas equipment is direct combustion equipment

[0045] The gas-consuming equipment is a direct-fired device. When the direct-fired equipment shuts down, the solenoid valve on its gas supply line instantly closes. Its actuation speed is much faster than the reaction speed of the pressure regulating device. During this time difference, a large amount of gas inertia flows into the closed pipeline between the pressure regulating device and the direct-fired equipment, causing the pipeline pressure to rise sharply and instantly exceed the cut-off set pressure Pts, causing the pressure regulating device to shut down. Therefore, every time the direct-fired equipment shuts down, the gas supply is interrupted, affecting the normal and continuous operation of the direct-fired equipment.

[0046] At present, in the working environment of direct-fired equipment, the common practice is to observe the maximum value of the gas pressure rise in the closed pipeline when the direct-fired equipment is shut down, and add 5-10KPa as the cut-off pressure setting value Pts on this basis to ensure the normal operation of the direct-fired equipment.

[0047] Increasing the cut-off pressure setting value Pts undoubtedly increases the risk of gas supply to a certain extent.

[0048] Working principle of the bidirectional damping device of the cut-off valve signal pipe (combined with the attached Figure 3 )

[0049] Gas supply 6 supplies gas,

[0050] 1. When the gas-using equipment is a direct-fired equipment (such as the burner 10), a two-way damper is installed on the cut-off signal tube 12. At this time, the cut-off set pressure Pts = 1.5-1.8P2.

[0051] 2. Before installing the two-way damper, adjust the adjusting nuts 2 on the left and right sides so that there is a certain gap (about 1.5-2.5mm) between the valve core 4 and the valve body 1 in the middle of the valve body to ensure that the gas can flow freely in both directions in the initial state.

[0052] 3. When adjusting the adjusting nut 2, ensure that the damping springs 5 ​​on the left and right sides have a slight pressing force.

[0053] 4. During normal operation, when the pressure downstream of the pressure regulating equipment fluctuates steadily, the air flow flows back and forth at the two-way damping to ensure normal pressure measurement.

[0054] 5. When the pressure regulating equipment (including the pressure regulator-pressure regulating head 7, connected to the pressure regulating signal tube 8; the pressure regulator-shut-off valve 13, connected to the shut-off signal tube 12) fails, causing the downstream pressure to rise slowly, when the shut-off valve senses a pressure exceeding Pts, the shut-off valve will operate to cut off the gas supply to ensure gas supply safety.

[0055] 6. When the direct-fired equipment is shut down, the solenoid valve is instantly closed, and the gas pressure downstream of the pressure regulating equipment rises sharply instantly (a pressure gauge 9 is provided). At the two-way damper 11, a large positive pressure difference is generated from right to left, causing the valve core 4 to move to the left, and the O-ring 3 forms a seal with the middle part of the valve body 1, and the shut-off valve 13 is not cut off; when the direct-fired equipment is started again, the gas in the closed pipeline drops to a normal state as it is consumed, and the two-way damper returns to its initial state; in this working mode, the continuous operation of the direct-fired equipment is guaranteed, and the gas supply safety is guaranteed.

[0056] Currently, in environments where direct-fired equipment operates, the common practice is to observe the maximum gas pressure rise in the closed pipeline when the direct-fired equipment is shut down, and then increase the cut-off pressure setpoint (Pts) by 5-10 kPa to ensure normal operation of the direct-fired equipment. This practice increases the risk of gas supply to a certain extent.

[0057] This device not only ensures the normal and continuous operation of the direct-fired equipment, but also ensures the safety of gas supply.

[0058] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A self-operated shut-off valve signal pipe bidirectional damping, characterized in that: include: Valve body, the valve body is an external enclosure shell with bidirectional damping; The damping valve core is used to control the flow rate of the airflow in the cut-off signal pipe or to cut off the airflow; the two ends of the damping valve core are screws; the middle part of the valve body has an annular structure that cooperates with the damping valve core; The damping spring is sleeved on the screw and is used to provide bidirectional damping stress when the airflow experiences instantaneous large flow rate / large pressure fluctuations; Adjusting nuts, two adjusting nuts are respectively sleeved on the screws at both ends, and the adjusting nuts are located outside the damping spring and are used to adjust the compression degree of the damping spring; The O-ring is arranged between the damping valve core and the annular structure.

2. The self-operated shut-off valve signal pipe bidirectional damping according to claim 1 is characterized in that: A gap of 1.5-2.5 mm is left between the damping valve core and the annular structure.

3. The self-operated shut-off valve signal pipe bidirectional damping according to claim 1 is characterized in that: The damping spring is in a slightly compressed state.

4. The self-operated shut-off valve signal pipe bidirectional damping according to claim 1, characterized in that: The length of the bidirectional damping of the self-operated shut-off valve signal tube is 70 mm, and the valve body is made of a hexagonal copper rod with opposite sides of 24 mm.

5. The self-operated shut-off valve signal pipe bidirectional damping according to claim 1 is characterized in that: The damping valve core is an arrow-shaped damping valve core with M5 screws at both ends.

6. The self-operated shut-off valve signal pipe bidirectional damping according to claim 1 is characterized in that: The O-ring is made of rubber.

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