Natural gas storage tank pressure relief adjusting device

Abstract

The utility model discloses a pressure relief adjusting device of a natural gas storage tank, and relates to the technical field of pressure relief valves. Comprising a valve body, a third-stage sealing ring, a second-stage sealing ring and a first-stage sealing ring, a third-stage pressure relief shaft is fixedly arranged on the third-stage sealing ring, a second-stage pressure relief shaft is fixedly arranged on the second-stage sealing ring, a first-stage pressure relief shaft is fixedly arranged on the first-stage sealing ring, and three groups of pressure relief holes are formed in the valve body. The multi-stage pressure relief mechanism is arranged and comprises the first-stage pressure relief mechanism, the second-stage pressure relief mechanism and the third-stage pressure relief mechanism which are independent of one another and work cooperatively. The third-stage sealing ring, the second-stage sealing ring, the first-stage sealing ring and the corresponding pressure relief shafts form a step-by-step progressive pressure relief defensive line. When the pressure in the storage tank rises, the lower-stage pressure relief mechanism senses the pressure and is started, and if the pressure is still not effectively controlled, the upper-stage pressure relief mechanism sequentially intervenes. The risk that the whole pressure relief system fails due to the fact that a certain stage of pressure relief mechanism breaks down is avoided, and it is guaranteed that the storage tank can operate safely under various working conditions.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pressure relief valves, in particular to a natural gas storage tank pressure relief adjusting device. BACKGROUND

[0002] With the wide application of natural gas in the energy field, the safety of natural gas storage tanks, as key equipment for storing natural gas, is of great importance. During the storage of natural gas, the internal pressure of the storage tank may change due to various factors, such as gas filling, external temperature fluctuations, natural evaporation of gas, etc. If the internal pressure of the storage tank cannot be effectively regulated, once the pressure exceeds the safe range, serious accidents such as leakage and explosion may occur, posing a great threat to personnel safety, the surrounding environment and production facilities.

[0003] Traditional natural gas storage tank pressure relief devices often have a single structure, usually relying on a simple pressure relief valve or a one-way pressure relief structure to cope with pressure changes. This single structure pressure relief method has many drawbacks: on the one hand, when the pressure relief valve fails, such as valve core jamming, poor sealing, etc., the entire pressure relief function will be greatly reduced or even completely disabled, unable to timely and effectively release the excessive pressure in the storage tank, leaving the storage tank in a highly dangerous state; on the other hand, the single pressure relief structure cannot finely adjust according to different degrees of pressure change, and can only achieve a full open or full closed pressure relief mode, making it difficult to meet the complex and variable pressure regulation requirements in actual working conditions, and easily causing excessive pressure relief or insufficient pressure relief.

[0004] In addition, with the development of natural gas storage technology towards large-scale and high-pressure, higher requirements are placed on the reliability, stability and precise control ability of the pressure relief device. The existing simple pressure relief device has been difficult to adapt to this development trend, and there is an urgent need for a new, more reliable and intelligent pressure relief adjusting device to ensure the safe operation of natural gas storage tanks. SUMMARY

[0005] To solve the above technical problems, the present application solves the problem of low reliability of the pressure relief valve in the prior art.

[0006] To achieve the above purpose, the technical solution adopted by the present application is as follows: a natural gas storage tank pressure relief adjusting device, comprising a valve body, a plurality of tertiary sealing rings, a plurality of secondary sealing rings and a plurality of primary sealing rings are slidably arranged on the valve body, a tertiary pressure relief shaft is fixedly arranged on the tertiary sealing ring, a secondary pressure relief shaft is fixedly arranged on the secondary sealing ring, and a primary pressure relief shaft is fixedly arranged on the primary sealing ring. The primary pressure relief shaft is slidably connected with the secondary pressure relief shaft, and the tertiary pressure relief shaft is slidably connected with the secondary pressure relief shaft. Three groups of pressure relief holes are arranged on the valve body.

[0007] To better realize this application, the third-stage pressure relief shaft is further fitted onto the second-stage pressure relief shaft, and the second-stage pressure relief shaft is fitted onto the first-stage pressure relief shaft.

[0008] To better realize this application, the valve body is further provided with a connecting seat and a connecting rod, the connecting rod is provided with a support ring, and the support ring is provided with a limiting cylinder.

[0009] To better realize this application, further, the third-stage pressure relief shaft and the second-stage pressure relief shaft are provided with sliding grooves, and connecting blocks are fixedly provided on the third-stage pressure relief shaft, the second-stage pressure relief shaft and the first-stage pressure relief shaft, and the connecting blocks on the third-stage pressure relief shaft and the second-stage pressure relief shaft are slidably disposed on their sliding grooves.

[0010] To better realize this application, a sliding rod is rotatably provided on the connecting block, a spring is fixedly provided on one end of the sliding rod near the connecting block, the spring is sleeved on the sliding rod, and a sliding groove is provided on the end of the sliding rod away from the connecting block.

[0011] To better realize this application, further, a plurality of mounting blocks are fixedly provided on the end of the support ring away from the limiting cylinder, and a shaft is provided on the mounting block, which is slidably connected to the slide groove of the slide rod.

[0012] The technical solution provided in this application has the following advantages compared with the prior art:

[0013] 1. This application incorporates a multi-stage pressure relief mechanism, including primary, secondary, and tertiary stages, which operate independently yet collaboratively. The tertiary sealing ring, secondary sealing ring, and primary sealing ring, along with their corresponding pressure relief shafts, form a progressively advancing pressure relief defense line. When the pressure inside the storage tank rises, the lower-level pressure relief mechanism senses the pressure and activates first. If the pressure is still not effectively controlled, the higher-level pressure relief mechanisms then intervene sequentially. This step-by-step response avoids the risk of the entire pressure relief system failing due to a malfunction in a single stage of the mechanism, significantly improving the reliability of the pressure relief process and ensuring the safe operation of the storage tank under various operating conditions.

[0014] 2. This application achieves precise sensing and control of the pressure inside the storage tank by designing sealing rings of different sizes and specifications and corresponding pressure relief hole layouts. In the initial stage of pressure change, small pressure changes only trigger the first-stage pressure relief mechanism, which releases pressure slightly through the corresponding pressure relief hole to maintain the relative stability of the pressure inside the storage tank. As the pressure further increases, the second-stage and third-stage pressure relief mechanisms are activated in sequence, gradually increasing the pressure relief range to meet the pressure relief needs of different pressure ranges. This effectively avoids excessive or insufficient pressure relief, ensuring that the pressure inside the storage tank remains within a safe and controllable range.

[0015] 3. The pressure-resistant mechanism in this application provides additional stability assurance for the pressure relief adjustment process. Each pressure relief mechanism is equipped with two symmetrically arranged pressure-resistant mechanisms, and the lengths of the connecting blocks on different pressure relief mechanisms are carefully designed to ensure that the spring lengths are consistent in the initial state, ensuring the overall smooth operation of the device. When the pressure relief mechanism is pushed by the pressure inside the storage tank, the spring contracts to generate gradually increasing resistance, preventing the pressure relief mechanism from moving too quickly, thereby precisely controlling the pressure relief adjustment range at each stage. By selecting springs with different elastic forces, it can also adapt to different pressure conditions, further enhancing the device's adaptability to various pressure changes and ensuring stable operation of the device in complex pressure environments. Attached Figure Description

[0016] Figure 1 This is the isometric drawing of this application;

[0017] Figure 2 This is a cross-sectional view of this application;

[0018] Figure 3 This is a schematic diagram of the three-stage pressure relief shaft of this application;

[0019] Figure 4 This is a schematic diagram of the structure of the secondary pressure relief shaft in this application;

[0020] In the diagram: 101-Valve body; 102-Connecting seat; 103-Connecting rod; 104-Support ring; 105-Limiting cylinder; 106-Third-stage pressure relief shaft; 107-Third-stage sealing ring; 108-Second-stage pressure relief shaft; 109-Second-stage sealing ring; 110-First-stage pressure relief shaft; 111-First-stage sealing ring; 112-Connecting block; 113-Slide rod; 114-Spring; 115-Mounting block. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0023] like Figures 1 to 4As shown, a natural gas storage tank pressure relief regulating device includes a valve body 101. Multiple tertiary sealing rings 107, multiple secondary sealing rings 109, and multiple primary sealing rings 111 are slidably disposed on the valve body 101. A tertiary pressure relief shaft 106 is fixedly disposed on the tertiary sealing rings 107, a secondary pressure relief shaft 108 is fixedly disposed on the secondary sealing rings 109, and a primary pressure relief shaft 110 is fixedly disposed on the primary sealing rings 111. The primary pressure relief shaft 110 is slidably connected to the secondary pressure relief shaft 108, and the tertiary pressure relief shaft 106 is slidably connected to the secondary pressure relief shaft 108. The valve body 101 is provided with three sets of pressure relief holes.

[0024] Specifically, the three-stage pressure relief shaft 106 and the three-stage sealing ring 107 form the first-stage pressure relief mechanism; the second-stage pressure relief shaft 108 and the second-stage sealing ring 109 form the second-stage pressure relief mechanism; and the first-stage pressure relief shaft 110 and the first-stage pressure relief shaft 111 form the third-stage pressure relief mechanism. The size of the third-stage sealing ring 107 is larger than that of the second-stage sealing ring 109, and the size of the second-stage sealing ring 109 is larger than that of the first-stage sealing ring 111, thus ensuring that the three-stage pressure relief mechanisms are independent of each other. By setting up multiple-stage pressure relief mechanisms, the pressure relief and regulation of the natural gas storage tank are gradually achieved. When the lower-stage pressure relief mechanism is pushed by the internal pressure of the storage tank, the upper-stage hydraulic mechanism will not move until the lower-stage pressure relief mechanism contacts the upper-stage pressure relief mechanism, at which point it will push the upper-stage pressure relief mechanism to move. Therefore, by setting up multiple-stage pressure relief mechanisms, the failure of a single-stage pressure relief mechanism can be prevented from reducing the pressure sensing capability, leading to pressure leakage and potential danger.

[0025] like Figure 2As shown, the valve body 101 has a stepped shape, with multiple pressure relief holes near the upper part of the lower stage. When the primary sealing ring 111 moves above the pressure relief hole, the uppermost primary sealing ring 111 on the primary pressure relief shaft 110 will first contact the secondary sealing ring 109 on the secondary pressure relief shaft 108. Thus, when the pressure pushes the lower primary sealing ring 111 to move, the upper primary sealing ring 111 will push the secondary sealing ring 109 to move until the lower primary sealing ring 111 moves above its corresponding pressure relief hole. At this point, a small amplitude is released through the pressure relief hole. When the pressure inside the gas tank remains high and faster pressure relief is needed, the pressure inside the gas tank pushes the primary sealing ring 111 upwards, driving the secondary sealing ring 109. When the primary sealing ring 111 reaches the middle end of the valve body 101 (i.e., after reaching the initial position of the secondary sealing ring 109), it stops moving. The pressure in the gas tank then pushes the secondary sealing ring 109, causing it to move to its corresponding pressure relief hole and push the tertiary sealing ring 107. This process repeats, with the tertiary sealing ring 107 operating similarly. If the pressure inside the gas tank remains too high after the tertiary sealing ring 107 has moved above its corresponding pressure relief hole, the pressure will push the tertiary sealing ring 107 upwards, disengaging it from the valve body 101, thus allowing for significant pressure relief through the opening at the top of the valve body 101.

[0026] like Figure 2 and Figure 3 As shown, the third-stage pressure relief shaft 106 is sleeved on the second-stage pressure relief shaft 108, and the second-stage pressure relief shaft 108 is sleeved on the first-stage pressure relief shaft 110.

[0027] like Figure 1 and Figure 3 As shown, a connecting seat 102 and a connecting rod 103 are fixedly provided on the valve body 101, a support ring 104 is fixedly provided on the connecting rod 103, and a limiting cylinder 105 is fixedly provided on the support ring 104.

[0028] Specifically, the valve body 101 is mounted on the natural gas storage tank via the connecting seat 102. After the third-stage sealing ring 107 disengages from the upper end of the valve body 101, the movement of the third-stage sealing ring 107 is restricted by the connecting rod 103, allowing it to slide only up and down. The movement direction of the third-stage pressure relief shaft 106 is restricted by the limiting cylinder 105, allowing it to slide only up and down. In the initial state, the third-stage sealing ring 107 at the lower end of the third-stage pressure relief shaft 106 is in contact with the connection between the upper end and the middle section of the valve body 101. This contact surface restricts the third-stage sealing ring 107 from moving further downward, thus limiting the downward sliding distance of the third-stage pressure relief shaft 106. The same applies to the second-stage pressure relief shaft 108 and the first-stage pressure relief shaft 110.

[0029] likeFigure 4 As shown, the third-stage pressure relief shaft 106 and the second-stage pressure relief shaft 108 are provided with sliding grooves, and connecting blocks 112 are fixedly provided on the third-stage pressure relief shaft 106, the second-stage pressure relief shaft 108 and the first-stage pressure relief shaft 110. The connecting blocks 112 on the third-stage pressure relief shaft 106 and the second-stage pressure relief shaft 108 are slidably disposed on their sliding grooves.

[0030] Specifically, the third-stage pressure relief shaft 106 has four symmetrical sliding grooves, and two connecting blocks 112 are directly fixedly installed on the outer wall of the third-stage pressure relief shaft 106. The second-stage pressure relief shaft 108 has two symmetrical sliding grooves, which are aligned with two of the four sliding grooves on the third-stage pressure relief shaft 106. The two connecting blocks 112 are fixedly installed on the second-stage pressure relief shaft 108 through the misaligned sliding grooves on the third-stage pressure relief shaft 106. That is, the two connecting blocks 112 installed on the second-stage pressure relief shaft 108 slide on the two sliding grooves on the third-stage pressure relief shaft 106. The first-stage pressure relief shaft 110 does not have sliding grooves, and two connecting blocks 112 are directly installed on the outer wall of the first-stage pressure relief shaft 110. These connecting blocks 112 are also slidably positioned on the aligned sliding grooves on the second-stage pressure relief shaft 108 and the third-stage pressure relief shaft 106.

[0031] When the primary sealing ring 111 is pushed by pressure, it drives the primary pressure relief shaft 110 to slide on the secondary pressure relief shaft 108. When the primary sealing ring 111 contacts the secondary sealing ring 109, the pressure then pushes the secondary sealing ring 109, which in turn drives the secondary pressure relief shaft 108 to slide on the tertiary pressure relief shaft 106. When the secondary sealing ring 109 contacts the tertiary sealing ring 107, the pressure then pushes the tertiary sealing ring 107, which in turn drives the tertiary pressure relief shaft 106 to slide on the limiting cylinder 105.

[0032] like Figures 2 to 4 As shown, a slide rod 113 is rotatably mounted on the connecting block 112. A spring 114 is fixedly mounted on one end of the slide rod 113 near the connecting block 112. The spring 114 is sleeved on the slide rod 113. A sliding groove is provided on one end of the slide rod 113 away from the connecting block 112.

[0033] A plurality of mounting blocks 115 are fixedly provided on one end of the support ring 104 away from the limiting cylinder 105. A shaft is provided on the mounting block 115, and the shaft is slidably connected to the slide groove of the slide rod 113.

[0034] Specifically, the connecting block 112, slide bar 113, spring 114 and mounting block 115 form a set of pressure-resistant mechanisms. Each pressure relief mechanism is equipped with two sets of pressure-resistant mechanisms, which are symmetrically arranged. The connecting block 112 on different pressure relief mechanisms has different lengths, so that the length of the spring 114 remains constant in the initial state, thereby enabling the device to operate more stably.

[0035] When the pressure relief mechanism is pushed by the pressure inside the natural gas storage tank, the pressure relief mechanism drives the connecting block 112 to move upward. The connecting block 112 drives the lower end of the slide rod 113 to move. The slide groove at the upper end of the slide rod 113 slides on the shaft of the mounting block 115. In the initial state, the upper end of the spring 114 on the slide rod 113 is in contact with the mounting block 115. When the slide rod 113 starts to slide, the spring 114 on the slide rod 113 begins to contract due to the obstruction of the mounting block 115. This increases the resistance to the movement of the lower end of the slide rod 113, thereby preventing the connecting block 112 and its pressure relief mechanism from moving. The pressure relief adjustment range of each stage on the valve body 101 is adjusted by this gradually increasing resistance. Pressure relief can only be achieved after the pressure inside the storage tank has increased to a certain level, or further pressure relief can be carried out. That is, by setting springs 114 with different elastic forces on the anti-pressure mechanism corresponding to each group of pressure relief mechanisms, different anti-pressure capabilities are formed, so as to achieve stability of the pressure relief adjustment capability under different pressure levels.

[0036] When the pressure does not exceed the predetermined threshold, i.e. when complete depressurization is required, only a small amount of pressure is released through each set of pressure relief holes. Different pressure relief mechanisms are gradually moved according to different pressure levels to achieve simultaneous pressure relief from multiple sets of pressure relief holes, thus ensuring the safety of the natural gas storage tank.

[0037] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A pressure relief regulating device for a natural gas storage tank, comprising a valve body (101), characterized in that: The valve body (101) is slidably provided with multiple tertiary sealing rings (107), multiple secondary sealing rings (109), and multiple primary sealing rings (111). A tertiary pressure relief shaft (106) is fixedly provided on the tertiary sealing ring (107), a secondary pressure relief shaft (108) is fixedly provided on the secondary sealing ring (109), and a primary pressure relief shaft (110) is fixedly provided on the primary sealing ring (111). The primary pressure relief shaft (110) is slidably connected to the secondary pressure relief shaft (108), and the tertiary pressure relief shaft (106) is slidably connected to the secondary pressure relief shaft (108). The valve body (101) is provided with three sets of pressure relief holes.

2. The natural gas storage tank pressure relief and regulation device according to claim 1, characterized in that: The third-stage pressure relief shaft (106) is sleeved on the second-stage pressure relief shaft (108), and the second-stage pressure relief shaft (108) is sleeved on the first-stage pressure relief shaft (110).

3. The natural gas storage tank pressure relief and regulation device according to claim 2, characterized in that: A connecting seat (102) and a connecting rod (103) are fixedly provided on the valve body (101). A support ring (104) is fixedly provided on the connecting rod (103), and a limiting cylinder (105) is fixedly provided on the support ring (104).

4. A natural gas storage tank pressure relief and regulating device according to claim 3, characterized in that: The third-stage pressure relief shaft (106) and the second-stage pressure relief shaft (108) are provided with sliding grooves, and connecting blocks (112) are fixedly provided on the third-stage pressure relief shaft (106), the second-stage pressure relief shaft (108) and the first-stage pressure relief shaft (110). The connecting blocks (112) on the third-stage pressure relief shaft (106) and the second-stage pressure relief shaft (108) are slidably disposed on their sliding grooves.

5. A natural gas storage tank pressure relief and regulating device according to claim 4, characterized in that: A slide rod (113) is rotatably mounted on the connecting block (112). A spring (114) is fixedly mounted on one end of the slide rod (113) near the connecting block (112). The spring (114) is sleeved on the slide rod (113). A sliding groove is provided on one end of the slide rod (113) away from the connecting block (112).

6. A natural gas storage tank pressure relief and regulating device according to claim 5, characterized in that: Multiple mounting blocks (115) are fixedly provided on one end of the support ring (104) away from the limiting cylinder (105). A shaft is provided on the mounting block (115), and the shaft is slidably connected to the slide groove of the slide rod (113).

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