An emergency shut-off valve with low temperature interlock by mechanical components

Abstract

The application relates to an emergency cut-off valve realizing low-temperature interlocking by mechanical components and relates to the valve field. The emergency cut-off valve comprises a valve body, a valve rod arranged through the valve body, flanges fixed at two ends of the valve body and an actuator connected with the upper end of the valve rod, and further comprises a mechanical low-temperature interlocking mechanism, wherein the mechanical low-temperature interlocking mechanism comprises a temperature sensing assembly, a transmission assembly and a locking assembly; the temperature sensing assembly is attached to the outer wall of a pipeline of the valve body, one end of the transmission assembly is connected with the temperature sensing assembly, and the other end of the transmission assembly is connected with the locking assembly. The emergency cut-off valve realizes the low-temperature interlocking function by adopting a pure mechanical structure, does not need any electronic components, effectively avoids the influence of a low-temperature environment on the electronic components, improves the reliability and stability of the valve under a low-temperature working condition, and is simple in structure, low in cost, convenient to maintain and suitable for various low-temperature medium conveying pipeline systems.

Description

Technical Field

[0001] This application relates to the technical field of valves, and in particular to an emergency shut-off valve that achieves cryogenic interlocking through mechanical components. Background Technology

[0002] Emergency shut-off valves are important safety control valves widely used in media transportation pipelines in industries such as petroleum, chemical, and natural gas. When abnormal operating conditions occur in the pipeline system, they can quickly shut off media transportation to prevent accidents from escalating. In cryogenic media transportation scenarios, emergency shut-off valves need to have a cryogenic interlock function, meaning that when the medium temperature falls below a set threshold, the valve automatically shuts off to prevent damage to pipelines and equipment caused by low temperatures, or to avoid other safety hazards caused by excessively low media temperatures.

[0003] Currently, most existing emergency shut-off valves with cryogenic interlocking functions rely on electronic components (such as temperature sensors, controllers, and solenoid valves) for interlocking control. However, in low-temperature environments, electronic components are prone to performance degradation and frequent failures, leading to interlocking failure and inability to shut off the valve in a timely manner, posing a significant safety risk. Furthermore, electronic control methods require additional power supplies and wiring, increasing equipment costs and reducing system reliability and maintenance convenience. Utility Model Content

[0004] To address the problems mentioned in the background section, this invention provides an emergency shut-off valve that achieves low-temperature interlocking through mechanical components. It employs a purely mechanical structure to realize the low-temperature interlocking function, eliminating the need for electronic components and solving the problem of easy failure and low reliability of electronic components in existing emergency shut-off valves at low temperatures.

[0005] To achieve the above objectives, this utility model provides the following technical solution: An emergency shut-off valve that achieves cryogenic interlocking through mechanical components includes a valve body, a valve stem extending through the valve body, flanges fixed at both ends of the valve body, and an actuator connected to the upper end of the valve stem. It also includes a mechanical cryogenic interlocking mechanism, which includes a temperature sensing component, a transmission component, and a locking component. The temperature sensing component is fitted to the outer wall of the valve body, one end of the transmission component is connected to the temperature sensing component, and the other end is connected to the locking component.

[0006] Optionally, the temperature sensing component includes a sensing base and a bimetallic strip. The sensing base is fixed to the outer wall of the valve body, and the bimetallic strip is embedded in the sensing base, with the free end of the bimetallic strip facing the transmission component.

[0007] By adopting the above technical solution, the sensing seat is fixed to the outer wall of the valve body by bolts, and the bimetallic strip is made of copper-iron alloy and is embedded in the groove of the sensing seat. The free end of the bimetallic strip is set upward and abuts against the lower end of the push rod of the transmission component.

[0008] Optionally, the transmission assembly includes a push rod, a guide sleeve, and a return spring. The guide sleeve is fixed to the top of the valve body, and the push rod slides through the guide sleeve. The lower end of the push rod abuts against the free end of the bimetallic strip, and the upper end is connected to the locking assembly. The return spring is sleeved on the outside of the push rod, and both ends of the return spring abut against the limiting bosses on the guide sleeve and the push rod, respectively.

[0009] Optionally, the locking assembly includes a locking block, a rotating shaft, and a torsion spring. The rotating shaft is fixed to a bracket on the top of the valve body. The locking block is rotatably sleeved on the rotating shaft. One end of the locking block abuts against the upper end of the push rod, and the other end is provided with a locking tongue that matches the locking groove on the valve stem. The torsion spring is sleeved on the outside of the rotating shaft, and both ends of the torsion spring are connected to the locking block and the bracket, respectively.

[0010] By adopting the above technical solution, the locking component is configured to cooperate with the valve stem to lock the valve stem at low temperatures, preventing the valve core from opening, and to release the valve stem after the temperature recovers, allowing the valve core to open and close normally.

[0011] Optionally, the valve stem is provided with multiple locking grooves spaced axially.

[0012] Optionally, the latch has an arc-shaped structure, and the end of the latch is provided with a guide bevel.

[0013] Optionally, the actuator can be a manual actuator or a pneumatic actuator, and the output end of the actuator is fixedly connected to the upper end of the valve stem.

[0014] By adopting the above technical solution, the output end of the pneumatic actuator is fixedly connected to the upper end of the valve stem through a coupling, which is used to drive the valve stem to move up and down, thereby realizing the opening and closing of the valve core.

[0015] Optionally, the inner wall of the valve body is provided with a corrosion-resistant coating.

[0016] By adopting the above technical solution, the valve body is made of stainless steel and the inner wall is coated with a polytetrafluoroethylene corrosion-resistant coating to achieve the effect of corrosion prevention.

[0017] Compared with the prior art, the beneficial effects of this utility model are: This utility model adopts a purely mechanical structure to realize the low-temperature interlock function without any electronic components, effectively avoiding the influence of the low-temperature environment on electronic components, improving the reliability and stability of the valve under low-temperature conditions, and at the same time, it has a simple structure, low cost, and convenient maintenance, and is suitable for various low-temperature media transportation pipeline systems. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this application; Figure 2 This is a cross-sectional structural diagram of the transmission component of this application; Figure 3 This is a schematic diagram of the temperature sensing component of this application; Figure 4 This is a schematic diagram of the locking component of this application.

[0019] Explanation of reference numerals in the attached drawings: 1. Valve body; 2. Valve stem; 21. Locking groove; 3. Flange; 4. Actuator; 5. Mechanical cryogenic interlocking mechanism; 51. Temperature sensing component; 511. Sensing seat; 512. Bimetallic strip; 52. Transmission component; 521. Push rod; 522. Guide sleeve; 523. Return spring; 53. Locking component; 531. Locking block; 5311. Locking tongue; 532. Rotating shaft. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Please see Figure 1-4 This utility model provides the following technical solution: an emergency shut-off valve that achieves low-temperature interlocking through mechanical components, including a valve body 1, a valve stem 2 that runs through the valve body 1, flanges 3 fixed at both ends of the valve body 1, and an actuator 4 connected to the upper end of the valve stem 2. It also includes a mechanical low-temperature interlocking mechanism 5, which includes a temperature sensing component 51, a transmission component 52, and a locking component 53. The temperature sensing component 51 is fitted to the outer wall of the pipe of the valve body 1. One end of the transmission component 52 is connected to the temperature sensing component 51, and the other end is connected to the locking component 53, for transmitting the deformation displacement of the temperature sensing component 51.

[0022] Specifically, in the temperature sensing component 51 of the mechanical cryogenic interlocking mechanism 5, the sensing seat 511 is fixed to the outer wall of the pipe of the valve body 1 by bolts, and the bimetallic strip 512 is made of copper-iron alloy and is embedded in the groove of the sensing seat 511. The free end of the bimetallic strip 512 is set upward and abuts against the lower end of the push rod 521 of the transmission component 52.

[0023] By adopting the above technical solution, the sensing seat 511 is fixed to the outer wall of the pipe of the valve body 1 by bolts, and the bimetallic strip 512 is made of copper-iron alloy and is embedded in the groove of the sensing seat 511. The free end of the bimetallic strip 512 is set upward and abuts against the lower end of the push rod 521 of the transmission component 52.

[0024] Specifically, the guide sleeve 522 of the transmission assembly 52 is welded to the bracket on the top of the valve body 1. The push rod 521 is made of stainless steel and slides through the guide sleeve 522. The middle part of the push rod 521 is provided with an annular limiting boss. The return spring 523 is sleeved on the outside of the push rod 521, and its two ends abut against the upper end face of the guide sleeve 522 and the lower end face of the limiting boss, respectively.

[0025] Specifically, the rotating shaft 532 of the locking assembly 53 is fixed to the bracket on the top of the valve body 1 by bearings. The locking block 531 is made of alloy steel and is rotatably sleeved on the rotating shaft 532. The left end of the locking block 531 abuts against the upper end of the push rod 521, and the right end is integrally formed with an arc-shaped locking tongue 5311. The end of the locking tongue 5311 is provided with a 15° guide slope. Three locking grooves 21 are provided axially along the valve stem 2, and the shape of the locking grooves 21 is adapted to the locking tongue 5311. A torsion spring is sleeved on the outside of the rotating shaft 532, with one end embedded in the groove of the locking block 531 and the other end fixed to the bracket. In the initial state, the torsion spring keeps the locking tongue 5311 separated from the valve stem 2.

[0026] By adopting the above technical solution, the locking component 53 is configured to cooperate with the valve stem 2 to lock the valve stem 2 in a low temperature state to prevent the valve core from opening, and to release the valve stem 2 after the temperature recovers, allowing the valve core to open and close normally.

[0027] Specifically, the valve stem 2 is provided with multiple locking grooves 21 spaced along the axial direction.

[0028] By adopting the above technical solution, the locking groove 21 can easily cooperate with the locking tongue 5311 to lock the valve stem 2.

[0029] Specifically, the latch 5311 has an arc-shaped structure, and the end of the latch 5311 is provided with a guide bevel.

[0030] Specifically, the actuator 4 is a manual actuator or a pneumatic actuator, and the output end of the actuator 4 is fixedly connected to the upper end of the valve stem 2.

[0031] By adopting the above technical solution, the output end of the pneumatic actuator is fixedly connected to the upper end of the valve stem 2 through a coupling, which is used to drive the valve stem 2 to move up and down, thereby realizing the opening and closing of the valve core.

[0032] Specifically, the inner wall of the valve body 1 is provided with a corrosion-resistant coating.

[0033] By adopting the above technical solution, the valve body 1 is made of stainless steel and the inner wall is coated with a polytetrafluoroethylene corrosion-resistant coating to achieve the effect of corrosion prevention.

[0034] The working principle and usage process of this utility model are as follows: When the temperature of the low-temperature medium (such as liquefied natural gas) in the pipeline is within the normal working range (-20℃~0℃), the bimetallic strip 512 is in a flat initial state, the push rod 521 is kept in a low position under the elastic pressure of the return spring 523, and the locking block 531 is separated from the locking groove 21 of the valve stem 2 under the action of the torsion spring. At this time, the pneumatic actuator 4 is started, which can drive the valve stem 2 to move up and down, and the valve core opens or closes accordingly, and the valve operates normally.

[0035] When the medium temperature drops to a set threshold (e.g., -40℃), the bimetallic strip 512 undergoes upward bending deformation due to the difference in thermal expansion and contraction coefficients between copper alloy and iron alloy. The free end tilts upward, pushing the push rod 521 to slide upward along the guide sleeve 522, and the return spring 523 is compressed. The upper end of the push rod 521 pushes the locking block 531 to rotate around the rotating shaft 532, and the torsion spring is twisted and stores force. Under the guidance of the guide slope, the locking tongue 5311 at the right end of the locking block 531 is inserted into the locking groove 21 corresponding to the valve stem 2, locking and fixing the valve stem 2. At this time, even if the pneumatic actuator 4 is activated, the valve stem 2 cannot move, and the valve core remains closed, realizing low-temperature interlock emergency shut-off.

[0036] As the medium temperature gradually returns to the normal range, the bending deformation of the bimetallic strip 512 gradually recovers until it returns to a straight state. The push rod 521 returns to its original position under the elastic force of the return spring 523, and the locking block 531 rotates under the return force of the torsion spring. The locking tongue 5311 disengages from the locking groove 21 of the valve stem 2, releasing the valve stem 2. The pneumatic actuator 4 can then drive the valve stem 2 to move again, and the valve returns to its normal operating state. Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An emergency shut-off valve that achieves cryogenic interlocking via mechanical components, comprising a valve body (1), a valve stem (2) extending through the valve body (1), flanges fixed at both ends of the valve body (1), and an actuator (4) connected to the upper end of the valve stem (2), characterized in that: It also includes a mechanical cryogenic interlock mechanism (5), which includes a temperature sensing component (51), a transmission component (52) and a locking component (53); the temperature sensing component (51) is attached to the outer wall of the pipe of the valve body (1), one end of the transmission component (52) is connected to the temperature sensing component (51), and the other end is connected to the locking component (53).

2. The emergency shut-off valve for cryogenic interlocking via mechanical components according to claim 1, characterized in that: The temperature sensing component (51) includes a sensing base (511) and a bimetallic strip (512). The sensing base (511) is fixed to the outer wall of the valve body (1), and the bimetallic strip (512) is embedded in the sensing base (511), with the free end of the bimetallic strip (512) facing the transmission component (52).

3. An emergency shut-off valve for cryogenic interlocking via mechanical components as described in claim 1, characterized in that: The transmission assembly (52) includes a push rod (521), a guide sleeve (522), and a return spring (523). The guide sleeve (522) is fixed to the top of the valve body (1). The push rod (521) slides through the guide sleeve (522). The lower end of the push rod (521) abuts against the free end of the bimetallic strip (512), and the upper end is connected to the locking assembly (53). The return spring (523) is sleeved on the outside of the push rod (521), and both ends of the return spring (523) abut against the limiting bosses on the guide sleeve (522) and the push rod (521), respectively.

4. An emergency shut-off valve for cryogenic interlocking via mechanical components as described in claim 3, characterized in that: The locking assembly (53) includes a locking block (531), a rotating shaft (532) and a torsion spring. The rotating shaft (532) is fixed on the bracket (6) at the top of the valve body (1). The locking block (531) is rotatably sleeved on the rotating shaft (532). One end of the locking block (531) abuts against the upper end of the push rod (521), and the other end is provided with a locking tongue (5311) that matches the locking groove (21) on the valve stem (2). The torsion spring is sleeved on the outside of the rotating shaft (532), and both ends of the torsion spring are connected to the locking block (531) and the bracket (6) respectively.

5. An emergency shut-off valve for cryogenic interlocking via mechanical components as described in claim 1, characterized in that: The valve stem (2) is provided with multiple locking grooves (21) spaced apart along the axial direction.

6. An emergency shut-off valve for cryogenic interlocking via mechanical components as described in claim 4, characterized in that: The latch (5311) has an arc-shaped structure, and the end of the latch (5311) is provided with a guide slope.

7. An emergency shut-off valve for cryogenic interlocking via mechanical components as described in claim 1, characterized in that: The actuator (4) is a manual actuator or a pneumatic actuator, and the output end of the actuator (4) is fixedly connected to the upper end of the valve stem (2).

8. An emergency shut-off valve for cryogenic interlocking via mechanical components as described in claim 1, characterized in that: The inner wall of the valve body (1) is provided with a corrosion-resistant coating.

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