Pipeline pressure relief structure and pressure relief valve comprising same

Abstract

The invention discloses a pipeline pressure relief structure and a pressure relief valve with the pressure relief structure, and relates to the field of pressure relief valves, the pipeline pressure relief structure comprises a main valve, a tower-shaped valve core, a pressure gauge, an amplification gear and a labor-saving lever, and changes the situation that in the prior art, precision of a pilot valve is adjusted through a needle valve, and the needle valve and the pilot valve need to continuously play a sensing role through similar structures such as springs; a tower-shaped valve element is arranged in a main valve to conduct multi-section control over flow, then driving force on the tower-shaped valve element is amplified in a multiplied mode through a hinge rod, an amplification gear and a labor-saving lever, accurate adjustment of the tower-shaped valve element is guaranteed, and the control precision of equipment is guaranteed. In addition, the pressure gauge is connected in the pilot valve through the oil bag, and the carry block facilitating adjustment of the elastic force of the piston by the spring is arranged, so that the pilot valve can be calibrated according to the display of the pressure gauge and the flow change of the main valve, the service life of the pressure relief valve structure is prolonged, and more accurate adjustment and use of the pressure relief structure are ensured.

Description

Technical Field

[0001] This invention relates to a pressure relief valve, specifically to a pipeline pressure relief structure and a pressure relief valve containing the pressure relief structure. Background Technology

[0002] Pipeline transportation systems require a certain pressure to transport the medium from the high-pressure end to the low-pressure end. However, the material strength of the pipeline is limited. To ensure the safe pressure range of the system, pressure relief structures are usually installed to regulate the pressure of the pipeline transportation system.

[0003] Existing pressure relief structures typically monitor the delivery pressure using a spring and adjust the opening of the pressure relief valve based on the delivery pressure of the medium in the pipeline system. In other words, the pressure relief valve is in a continuous adjustment state, which leads to severe wear between the corresponding parts, affecting the sealing performance. In addition, the spring being in a compressed and continuously adjusting state will seriously affect the spring's elastic coefficient, resulting in problems such as poor accuracy in regulating pipeline pressure and short service life of existing pressure relief valve structures.

[0004] To address the above issues, those skilled in the art propose a pipeline pressure relief structure and a pressure relief valve containing the pressure relief structure. This involves structural adjustments to the existing pressure relief structure, enabling real-time calibration of the pressure regulation accuracy of the pressure relief structure, and reducing wear and tear on components caused by prolonged operation. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a pipeline pressure relief structure and a pressure relief valve containing the pressure relief structure. It improves upon the existing combined pressure relief structure of a main valve and a pilot valve. After sensing the delivery pressure at one end of the main valve, the pilot valve compresses a spring to advance. Through an amplifying gear and a lever, it drives a tower-shaped valve core to advance at different distances to regulate the flow rate of the main valve. Additionally, an adjusting bolt is provided to adjust the spring's clamping force, ensuring that the pilot valve can adjust and precisely trigger the main valve. Furthermore, the adjustable flow rate of the main valve enables the regulation and relief of pipeline delivery pressure, ensuring the safe use of the delivery pipeline.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a pipeline pressure relief structure, comprising a main valve, a pilot valve, and a pressure gauge. In existing pressure relief valves, the pilot valve is typically located at the front end of the main valve. The pilot valve is connected to a pressure gauge. The input medium is blocked by the main valve to accumulate pressure. As the delivery pressure of the medium increases, it pushes the pilot valve. Once a certain limit is reached, the pilot valve triggers the main valve to open. The pressure gauge connected to the pilot valve is used to monitor the delivery pressure of the medium at the pilot valve end. Typically, a needle valve is also provided to adjust the triggering accuracy of the pilot valve on the main valve.

[0007] The main valve includes a valve body and a valve core for sealing the valve body, but here the valve core is structurally improved to solve the problem raised.

[0008] The pilot valve includes a valve chamber, a piston, a valve stem, and a spring. The valve chamber is vertically fixed to the side of the valve body. The piston is slidably disposed inside the valve chamber. The valve stem is fixedly connected to the upper surface of the piston. The spring is sleeved on the side of the valve stem. The valve chamber is in communication with the front end of the valve body. As the delivery pressure increases, the input medium exerts a force on the piston. This force compresses the spring, causing it to deform. Consequently, the piston and the valve stem move forward together. The movement of the valve stem triggers and drives the adjustment of the main valve.

[0009] A tower-shaped valve core is inserted into the inner side of the valve body along the extension direction of the valve cavity. The tower-shaped valve core structure can gradually change the flow rate of the medium inside the valve body as the advance distance changes. The advance distance of the valve stem in the pilot valve drives the tower-shaped valve core to advance to different degrees, so as to adjust the cross-sectional size of the medium flow in the valve body and realize the control of the delivery pressure in the pipeline system.

[0010] The tower-shaped valve core is installed in the opposite direction to the flow direction of the medium in the valve body. This avoids unnecessary effects on the tower-shaped valve core caused by the flow of the medium in the pipeline system, and further ensures the sealing effect of the equipment. However, it also increases the force required to open the tower-shaped valve core.

[0011] The main valve and the pilot valve are fixedly connected to the side of the equipment box. One end of the tower-shaped valve core and the valve stem both extend into the inside of the equipment box. The main valve and the pilot valve are controlled in conjunction with each other through the installation structure inside the equipment box.

[0012] A hinge rod is hinged to one side of the valve stem extending into the equipment box. An amplifying gear is provided on the inner wall of the equipment box. The hinge rod is connected to the tower-shaped valve core through the amplifying gear. When the valve stem advances, it drives the hinge rod to move together. The other end of the hinge rod drives the rotation of the amplifying gear through a meshing relationship. The amplifying gear amplifies the advance of the valve stem proportionally, thereby achieving more obvious and precise control over the discharge volume of the main valve.

[0013] A force-saving lever is also provided between the amplifying gear and the tower-shaped valve core. Under the action of the force-saving lever, the tower-shaped valve core is driven to make advance adjustment with a small force, thereby avoiding the problem that the input end delivery pressure cannot drive the tower-shaped valve core to make advance adjustment, and also avoiding the problem that it is difficult to open because the tower-shaped valve core is set in the opposite direction to the medium flow.

[0014] An oil bladder is fixed on the upper surface of the piston. The oil bladder is connected to the pressure gauge through an oil pipe. When the piston senses the pressure at the input end of the main valve and the pressure increases, the oil bladder is squeezed as the piston moves forward. The hydraulic oil inside is driven by the pressure gauge through the oil pipe, which facilitates the monitoring of the pressure at the input end of the main valve. Furthermore, the control accuracy of the pilot valve on the main valve can be adjusted accordingly by monitoring the pressure.

[0015] An advance block is slidably disposed on the inner wall of the valve chamber and against the top of the spring. In conjunction with the monitoring of the input pressure by the pressure gauge and the control of the main valve flow, the position of the advance block can be adjusted to control the spring force applied to the piston, thereby achieving the accuracy calibration of the pilot valve's control over the main valve. This avoids the problem of the elastic coefficient changing due to the spring being in a compressed working state for a long time, which would affect the adjustment accuracy of this pressure relief system.

[0016] Preferably, the inner wall bearing of the equipment box is provided with a rotating shaft, one end of the tower-shaped valve core extends into the equipment box and meshes with the rotating shaft, the side of the rotating shaft is meshed with a first arc-shaped rack, and the end of the force-saving lever away from the amplifying gear is fixedly connected to the first arc-shaped rack.

[0017] When the lever is driven to rotate by the amplifying gear, the tower-shaped valve core is driven to advance through the meshing relationship between the first arc-shaped rack and the rotating shaft, thereby proportionally amplifying the driving force of the amplifying gear on the tower-shaped valve core.

[0018] Preferably, the force-saving lever is hinged to the inner wall of the equipment box. After the force-saving lever is driven by the meshing of the amplified gear at one end, the other end amplifies the driving force and applies it to the tower-shaped valve core.

[0019] The side of the tower-shaped valve core is provided with a first groove corresponding to the first arc-shaped rack, and the first arc-shaped rack engages with the rotating shaft through the limiting and guiding of the first groove.

[0020] The other end of the effort-saving lever is fixedly connected to the amplifying gear with a second arc-shaped rack. The effort-saving lever is meshed with the amplifying gear through the second arc-shaped rack. When the amplifying gear is driven to rotate by the hinge rod, the rotation of the amplifying gear drives the second arc-shaped rack and the effort-saving lever fixed thereto to rotate around the hinge point as the axis. The end of the effort-saving lever drives the rotating shaft with a linear velocity amplified by multiples, ensuring that the tower-shaped valve core accurately adjusts the valve body flow as the valve stem advances.

[0021] Preferably, a hinge seat is fixedly connected to the side of the valve stem, the hinge rod is hinged to the valve stem through the hinge seat, and a gear rack is hinged to the end of the hinge rod away from the valve stem, the gear rack meshing with an amplifying gear.

[0022] When one end of the hinge rod advances upward with the valve stem, the hinge rod rotates at a certain angle according to the hinge point with the equipment box and pushes the advance rack to advance in the opposite direction. Then, the advance rack drives the amplifying gear to rotate through the meshing action of the amplifying gear.

[0023] Preferably, a second sliding groove is provided through the side of the hinge rod, and a fixed shaft is fixedly connected to the inner wall of the equipment box corresponding to the hinge rod. The hinge rod is arranged between the valve stem and the amplifying gear through the cooperation of the fixed shaft and the second sliding groove.

[0024] The hinge rod is slidably connected to the equipment box via a second sliding groove, which can prevent one end of the hinge rod from being obstructed when it advances with the valve rod. The hinge rod slides and hinges with the fixed shaft via the second sliding groove, which not only ensures that the advance rack is driven synchronously when one end of the hinge rod advances, but also ensures that the hinge rod advances together with the valve rod.

[0025] Preferably, a hinge shaft is fixed at one end of the hinge rod near the feed rack, and the hinge rod is hinged to the feed rack through the hinge shaft. A guide rail is also fixed on one side of the amplifying gear corresponding to the feed rack. The guide rail limits and guides the feed rack's movement, ensuring that the hinge rod drives the feed rack in a fixed direction and preventing the feed rack from disengaging from the amplifying gear.

[0026] Preferably, the inner wall of the valve cavity is also fixedly connected to a pressure plate corresponding to the oil bladder, and the inner wall of the valve cavity is vertically provided with a guide groove. The advance block is slidably disposed above the spring through the guide groove, and the spring force on the piston is adjusted by adjusting the installation position of the pressure plate.

[0027] Preferably, the upper and lower surfaces of the feed block are fixedly connected to limit sleeves, and the end of the spring away from the piston extends into the inner side of the limit sleeve. The limit sleeve ensures that the spring and the feed block are in stable contact, and avoids the excessive elastic force of the spring after compression, which may cause slippage between the spring and the feed block.

[0028] An advance rod is slidably provided on the inner side of the equipment box along the guide groove and above the advance block. The bottom end of the advance rod also extends into the inner side of the limiting sleeve and abuts against the upper surface of the advance block. The advance rod slidably provided on the inner side of the guide groove can facilitate the adjustment of the pressure plate from outside the equipment box.

[0029] Preferably, the top of the equipment box is through-hole and the bearing is provided with an adjusting bolt. The bottom end of the adjusting bolt is threadedly connected to the feed rod. The adjusting bolt connected to the bearing of the equipment box will not change its extension length relative to the equipment box due to different adjustments, thereby ensuring the aesthetic appearance of the equipment and avoiding accidental contact with the adjusting bolt by the outside. After rotating the adjusting bolt, the feed rod is driven to move along the guide groove through the threaded connection, thereby applying pressure to the pressure plate through the feed rod. This pressure balances the spring force on the pressure plate to ensure the positioning of the pressure plate, thereby changing the magnitude of the spring force applied to the piston at a predetermined distance.

[0030] A pressure relief valve is provided, which is equipped with the pipeline pressure relief structure described above. The pressure relief valve consists of a main valve, a pilot valve, a pressure gauge, and corresponding guide pipes. The two ends of the main valve are respectively connected to an input pipe and an output pipe to control the transmission pressure of the medium in the pipeline system.

[0031] This invention discloses a pipeline pressure relief structure and a pressure relief valve containing the pressure relief structure, which have the following beneficial effects:

[0032] 1. This pipeline pressure relief structure and pressure relief valve containing the pressure relief structure change the existing technology where the pilot valve adjusts the accuracy through a needle valve. Both the needle valve and the pilot valve require a spring or similar structure to continuously exert a sensing effect, which is prone to structural wear and deterioration of durability, affecting the equipment's control accuracy. The main valve is equipped with a tower-shaped valve core for multi-stage flow control. The driving force on the tower-shaped valve core is amplified by a hinge rod, amplifying gear, and a force-saving lever, ensuring precise adjustment of the tower-shaped valve core. In addition, the pilot valve is connected to a pressure gauge through an oil bladder and is equipped with a move-in block for easy adjustment of the spring force on the piston. The pilot valve can be calibrated based on the pressure gauge display and the main valve flow changes, extending the service life of the pressure relief valve structure and ensuring more precise adjustment of this pressure relief structure.

[0033] 2. The pipeline pressure relief structure and the pressure relief valve containing the pressure relief structure replace the existing valve core, which simply controls the on / off state, with a tower-shaped valve core of uneven thickness. This allows the actual conveying speed of the medium in the valve body to be changed by adjusting the advance distance, thereby achieving the regulation and pressure relief of the pipeline system. Furthermore, the advance direction of the tower-shaped valve core is set in the opposite direction to the flow direction of the medium in the pipeline, which can ensure a better sealing effect of the valve core on the valve body and avoid wear and other effects caused by the flow of the medium in the valve body.

[0034] 3. In the pipeline pressure relief structure and the pressure relief valve containing the pressure relief structure, as the valve stem advances, one end of the hinge rod deflects and advances accordingly. In order to ensure the driving effect of the hinge rod on the advancing rack, a second sliding groove is opened on the side of the hinge rod and slides to connect with the inner wall of the equipment box, so that when one end of the hinge rod deflects, the other end drives the advancing rack, and one end of the hinge rod can advance together with the valve stem.

[0035] 4. The pipeline pressure relief structure and the pressure relief valve containing the pressure relief structure have an amplifying gear between the pilot valve and the main valve for transmission connection, which can amplify the advance distance of the valve stem by a factor of two, thereby enabling more precise control of the advance distance of the tower-shaped valve core.

[0036] 5. The pipeline pressure relief structure and the pressure relief valve containing the pressure relief structure also have a force-saving lever between the amplifying gear and the tower-shaped valve core for force transmission. By reasonably distributing the length of the two ends of the force-saving lever, the force exerted by the amplifying gear on one end of the force-saving lever is amplified, thereby ensuring that the tower-shaped valve core can overcome the medium flow resistance and make the corresponding advance. In addition, the flow rate of the medium in the valve body can be controlled more accurately by amplifying the advance distance. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0039] Figure 2 This is a cross-sectional view of the overall structure of the present invention;

[0040] Figure 3 For the present invention Figure 2 Enlarged schematic diagram of the structure at point A in the middle;

[0041] Figure 4 This is a cross-sectional view of the equipment box structure of the present invention;

[0042] Figure 5 This is a schematic diagram of the force-saving lever structure and transmission of the present invention;

[0043] Figure 6 This is a schematic diagram of the hinge rod installation and linkage structure of the present invention;

[0044] Figure 7 This is a schematic diagram of the spring force adjustment structure of the present invention;

[0045] Figure 8 For the present invention Figure 7 Enlarged schematic diagram of the structure at point B in the middle.

[0046] In the diagram: 1. Main valve; 101. Valve body; 102. Tower-shaped valve core; 2. Pilot valve; 201. Valve chamber; 202. Piston; 203. Valve stem; 204. Spring; 3. Pressure gauge; 4. Equipment box; 5. Hinge rod; 6. Amplifying gear; 7. Force-saving lever; 8. Oil bladder; 9. Feed block; 10. Rotating shaft; 11. First arc-shaped rack; 12. First slide groove; 13. Second arc-shaped rack; 14. Hinge seat; 15. Feed rack; 16. Second slide groove; 17. Fixed shaft; 18. Hinge shaft; 19. Guide slide rail; 20. Pressure plate; 21. Guide groove; 22. Limit sleeve; 23. Feed rod; 24. Adjusting bolt. Detailed Implementation

[0047] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are described clearly and completely. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0048] This invention discloses a pipeline pressure relief structure and a pressure relief valve containing the pressure relief structure;

[0049] According to the appendix Figure 1 As shown, the device includes a main valve 1, a pilot valve 2, and a pressure gauge 3. In existing pressure relief valves, the pilot valve 2 is usually located at the front end of the main valve 1. The pilot valve 2 is connected to the pressure gauge 3. The input medium is blocked by the main valve 1 to accumulate pressure. As the pressure of the medium increases, it pushes the pilot valve 2. When a certain limit is reached, the pilot valve 2 triggers the main valve 1 to open. The pressure gauge 3, which is connected to the pilot valve 2, is used to monitor the medium's delivery pressure at the pilot valve 2 end. Usually, a needle valve is also provided to adjust the triggering accuracy of the pilot valve 2 on the main valve 1.

[0050] According to the appendix Figure 2 and attached Figure 3 As shown, the main valve 1 includes a valve body 101 and a valve core for sealing the valve body 101, but here the valve core is structurally improved in order to solve the problem.

[0051] The pilot valve 2 includes a valve chamber 201, a piston 202, a valve stem 203, and a spring 204. The valve chamber 201 is vertically fixed to the side of the valve body 101. The piston 202 is slidably arranged inside the valve chamber 201. The valve stem 203 is fixedly connected to the upper surface of the piston 202. The spring 204 is sleeved on the side of the valve stem 203. The valve chamber 201 is connected to the front end of the valve body 101. As the conveying pressure increases, the input medium applies a force to the piston 202. This force compresses the spring 204, causing it to deform. Consequently, the piston 202 and the valve stem 203 move forward together. The movement of the valve stem 203 triggers and drives the adjustment of the main valve 1.

[0052] A tower-shaped valve core 102 is inserted into the inner side of the valve body 101 along the extension direction of the valve cavity 201. The tower-shaped valve core structure can gradually change the flow rate of the medium inside the valve body 101 as the advance distance changes. The tower-shaped valve core 102 is driven to advance to different degrees by the advance distance of the valve stem 203 in the pilot valve 2, so as to adjust the cross-sectional size of the medium flow in the valve body 101 and realize the control of the delivery pressure in the pipeline system.

[0053] The tower-shaped valve core 102 is installed in the opposite direction to the flow direction of the medium in the valve body 101. This avoids unnecessary effects on the tower-shaped valve core 102 caused by the flow of the medium in the pipeline system, and further ensures the sealing effect of the equipment. However, it also increases the force required to open the tower-shaped valve core 102.

[0054] According to the appendix Figure 4 As shown, the main valve 1 and the pilot valve 2 are fixedly connected to the side of the equipment box 4. One end of the tower-shaped valve core 102 and the valve stem 203 both extend into the inside of the equipment box 4. The main valve 1 and the pilot valve 2 are controlled in conjunction with each other through the installation structure inside the equipment box 4.

[0055] A hinge rod 5 is hinged to one end of the valve stem 203 extending into the equipment box 4. An amplifying gear 6 is provided on the inner wall of the equipment box 4. The hinge rod 5 is connected to the tower-shaped valve core 102 through the amplifying gear 6. When the valve stem 203 advances, it drives the hinge rod 5 to move together. The other end of the hinge rod 5 drives the rotation of the amplifying gear 6 through a meshing relationship. The amplifying gear 6 amplifies the advance of the valve stem 203 proportionally, thereby achieving more obvious and precise control of the discharge of the main valve 1.

[0056] A force-saving lever 7 is also provided between the amplifying gear 6 and the tower-shaped valve core 102. Under the action of the force-saving lever 7, the tower-shaped valve core 102 is driven to make advance adjustment with a small force, thereby avoiding the problem that the input end delivery pressure cannot drive the tower-shaped valve core 102 to make advance adjustment, and also avoiding the problem that it is difficult to open because the tower-shaped valve core 102 is set in the opposite direction to the medium flow.

[0057] An oil bladder 8 is fixed on the upper surface of piston 202. The oil bladder 8 is connected to pressure gauge 3 through an oil pipe. When piston 202 senses the advance of the input pressure of main valve 1, oil bladder 8 is squeezed as piston 202 advances. The hydraulic oil in it drives pressure gauge 3 through the oil pipe, thereby facilitating the monitoring of the input pressure of main valve 1. Furthermore, the control accuracy of pilot valve 2 on main valve 1 can be adjusted accordingly by monitoring the input pressure.

[0058] An advance block 9 is slidably provided on the inner wall of the valve chamber 201 and against the top of the spring 204. In conjunction with the monitoring of the input pressure by the pressure gauge 3 and the flow control of the main valve 1, the position of the advance block 9 can be adjusted to control the spring force applied by the spring 204 to the piston 202, thereby achieving the accuracy calibration of the pilot valve 2's control over the main valve 1. This avoids the problem that the elastic coefficient of the spring 204 changes due to prolonged compression, which would affect the adjustment accuracy of this pressure relief system.

[0059] According to the appendix Figure 5 As shown, the inner wall bearing of the equipment box 4 is provided with a rotating shaft 10. One end of the tower-shaped valve core 102 extends into the equipment box 4 and meshes with the rotating shaft 10. The side of the rotating shaft 10 is meshed with a first arc-shaped rack 11. The end of the force-saving lever 7 away from the amplifying gear 6 is fixedly connected to the first arc-shaped rack 11.

[0060] When the lever 7 is driven to rotate by the amplifying gear 6, the tower-shaped valve core 102 is driven to advance through the meshing relationship between the first arc-shaped rack 11 and the rotating shaft 10, thereby proportionally amplifying the driving force of the amplifying gear 6 on the tower-shaped valve core 102.

[0061] Preferably, the effort-saving lever 7 is hinged to the inner wall of the equipment box 4. The effort-saving lever 7, which is hinged to the equipment box 4, can be driven by the amplifying gear 6 at one end, and the driving force at the other end can be amplified by multiple and applied to the tower-shaped valve core 102.

[0062] The side of the tower-shaped valve core 102 is provided with a first groove 12 corresponding to the first arc-shaped rack 11. The first arc-shaped rack 11 is engaged with the rotating shaft 10 through the limiting and guiding of the first groove 12.

[0063] The other end of the effort-saving lever 7 is fixedly connected to the amplifying gear 6 with a second arc-shaped rack 13. The effort-saving lever 7 is meshed with the amplifying gear 6 through the second arc-shaped rack 13. When the amplifying gear 6 is driven to rotate by the hinge rod 5, the rotation of the amplifying gear 6 drives the second arc-shaped rack 13 and the effort-saving lever 7 fixed thereto to rotate around the hinge point. The end of the effort-saving lever 7 drives the rotating shaft 10 with a linear velocity amplified by multiples, ensuring that the tower-shaped valve core 102 accurately adjusts the flow of the valve body 101 as the valve stem 203 advances.

[0064] According to the appendix Figure 6 As shown, a hinge seat 14 is fixedly connected to the side of the valve stem 203. The hinge rod 5 is hinged to the valve stem 203 through the hinge seat 14. The end of the hinge rod 5 away from the valve stem 203 is hinged to a gear 15, which meshes with the amplifying gear 6.

[0065] When one end of the hinge rod 5 moves upward with the valve stem 203, the hinge rod 5 rotates at a certain angle according to the hinge point with the equipment box 4 and pushes the advance rack 15 to move in the opposite direction. Then, the advance rack 15 drives the amplifying gear 6 to rotate through the meshing action of the amplifying gear 6.

[0066] Preferably, a second sliding groove 16 is provided through the side of the hinge rod 5, and a fixed shaft 17 is fixedly connected to the inner wall of the equipment box 4 corresponding to the hinge rod 5. The hinge rod 5 is set between the valve stem 203 and the amplifying gear 6 through the cooperation of the fixed shaft 17 and the second sliding groove 16.

[0067] The hinge rod 5 is slidably connected to the equipment box 4 through the second slide groove 16, which can prevent one end of the hinge rod 5 from being obstructed when it moves forward with the valve rod 203. The hinge rod 5 is slidably and hinged to the fixed shaft 17 through the second slide groove 16, which not only ensures that the advancing rack 15 is driven synchronously when one end of the hinge rod 5 moves forward, but also ensures that the hinge rod 5 moves forward together with the valve rod 203.

[0068] According to the appendix Figure 7 As shown, a hinge shaft 18 is fixed at one end of the hinge rod 5 near the feed rack 15. The hinge rod 5 is hinged to the feed rack 15 through the hinge shaft 18. A guide rail 19 is also fixed on one side of the amplifying gear 6 corresponding to the feed rack 15. The guide rail 19 limits and guides the feed of the feed rack 15, ensuring that the hinge rod 5 drives the feed of the feed rack 15 in a fixed direction, and preventing the feed rack 15 from disengaging from the amplifying gear 6.

[0069] Preferably, the inner wall of the valve cavity 201 is also fixedly connected to the oil bladder 8 with a pressure plate 20. The inner wall of the valve cavity 201 is vertically provided with a guide groove 21. The advance block 9 is slidably set above the spring 204 through the guide groove 21. The spring force of the spring 204 on the piston 202 is adjusted by adjusting the installation position of the pressure plate 20.

[0070] According to the appendix Figure 8 As shown, the upper and lower surfaces of the feed block 9 are fixedly connected to the limiting sleeve 22. The end of the spring 204 away from the piston 202 extends into the inner side of the limiting sleeve 22. The limiting sleeve 22 ensures that the spring 204 and the feed block 9 are in stable contact, and avoids the excessive elastic force of the spring 204 after compression, which may cause slippage between the spring 204 and the feed block 9.

[0071] An advance rod 23 is slidably provided on the inner side of the equipment box 4 along the guide groove 21 and above the advance block 9. The bottom end of the advance rod 23 also extends into the inner side of the limiting sleeve 22 and abuts against the upper surface of the advance block 9. The advance rod 23, which is slidably provided on the inner side of the guide groove 21, can facilitate the adjustment of the pressure plate 20 from outside the equipment box 4.

[0072] Preferably, the top of the equipment box 4 is through-hole and the bearing is provided with an adjusting bolt 24. The bottom end of the adjusting bolt 24 is threadedly connected to the advance rod 23. The adjusting bolt 24 connected to the bearing of the equipment box 4 will not change its extension length relative to the equipment box 4 due to different adjustments, thereby ensuring the aesthetic appearance of the equipment and avoiding accidental contact of the adjusting bolt 24 by the outside. After rotating the adjusting bolt 24, the advance rod 23 is driven to move along the guide groove 21 through the threaded connection, thereby applying pressure to the pressure plate 20 through the advance rod 23. This pressure balances the elastic force of the spring 204 on the pressure plate 20 to ensure the positioning of the pressure plate 20, thereby changing the magnitude of the elastic force applied by the spring 204 to the piston 202 at a predetermined distance.

[0073] A pressure relief valve is provided, which is equipped with the above-mentioned pipeline pressure relief structure. The pressure relief valve is composed of a main valve 1, a pilot valve 2, a pressure gauge 3 and corresponding guide pipes. The two ends of the main valve 1 are connected to the input pipe and the output pipe respectively, and control the transmission pressure of the medium in the pipeline system.

[0074] This pipeline pressure relief structure and the pressure relief valve containing the pressure relief structure change the existing technology where the pilot valve 2 adjusts the accuracy through a needle valve. Both the needle valve and the pilot valve 2 require a spring 204 or similar structure to continuously perform sensing, which is prone to structural wear and reduced durability, affecting the equipment's control accuracy. The main valve 1 is equipped with a tower-shaped valve core 102 for multi-stage flow control. The driving force of the pilot valve 2 on the tower-shaped valve core 102 is amplified by the hinge rod 5, the amplifying gear 6, and the force-saving lever 7, ensuring precise adjustment of the advance distance of the tower-shaped valve core 102. In addition, the pilot valve 2 is connected to the pressure gauge 3 through an oil bladder 8 and is equipped with an advance block 9 for easy adjustment of the spring force of the spring 204 on the piston 202. The pilot valve 2 can be calibrated based on the pressure gauge 3 display and the flow change of the main valve 1, extending the service life of the pressure relief valve structure and ensuring more precise adjustment of this pressure relief structure.

[0075] Furthermore, the valve core in the existing valve body 101, which simply controls the on / off state, is replaced with a tower-shaped valve core 102 of uneven thickness. This allows the actual conveying speed of the medium in the valve body 101 to be changed by adjusting the advance distance, thereby achieving the regulation and pressure relief of the pipeline system. Moreover, the advance direction of the tower-shaped valve core 102 is set opposite to the flow direction of the medium in the pipeline, which can ensure a better sealing effect of the tower-shaped valve core 102 on the valve body 101 and avoid the flow of the medium in the valve body 101 from causing wear and other effects on the tower-shaped valve core 102.

[0076] Furthermore, as the valve stem 203 advances, one end of the hinge rod 5 deflects and advances accordingly. In order to ensure the driving effect of the hinge rod 5 on the advancing rack 15, a second sliding groove 16 is opened on the side of the hinge rod 5 and slidably connected to the inner wall of the equipment box 4, so that when one end of the hinge rod 5 deflects, the other end drives the advancing rack 15, and one end of the hinge rod 5 can advance together with the valve stem 203.

[0077] Furthermore, an amplifying gear 6 is installed between the pilot valve 2 and the main valve 1 for transmission connection, which can amplify the advance distance of the valve stem 203 by a factor of two, thereby enabling more precise control of the advance distance of the tower-shaped valve core 102.

[0078] Furthermore, a force-saving lever 7 is provided between the amplifying gear 6 and the tower-shaped valve core 102 to transmit force. By reasonably distributing the lengths of the two ends of the force-saving lever 7, the force exerted by the amplifying gear 6 on one end of the force-saving lever 7 is increased, thereby ensuring that the tower-shaped valve core 102 can overcome the resistance of medium flow and make corresponding advances. In addition, the flow rate of the medium in the valve body 101 can be controlled more accurately by amplifying the advance distance.

[0079] The foregoing has shown and described 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 to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A pipeline pressure relief structure, comprising a main valve (1), a pilot valve (2) and a pressure gauge (3), wherein the pilot valve (2) is arranged at the front end of the main valve (1), the pilot valve (2) is connected to the pressure gauge (3), the main valve (1) comprises a valve body (101), the pilot valve (2) comprises a valve chamber (201), a piston (202), a valve stem (203) and a spring (204), the valve chamber (201) is vertically fixed to the side of the valve body (101), and is characterized in that: A tower-shaped valve core (102) is inserted and arranged on the inner side of the valve body (101) along the extension direction of the valve cavity (201), and the tower-shaped valve core (102) is installed in the opposite direction to the flow direction of the medium in the valve body (101); The sides of the main valve (1) and the pilot valve (2) are fixedly connected to an equipment box (4), and one end of the tower-shaped valve core (102) and the valve stem (203) both extend to the inside of the equipment box (4); The valve stem (203) is extended into the side of one end of the equipment box (4) and is hingedly provided with a hinge rod (5); the inner wall of the equipment box (4) is provided with an amplifying gear (6); the hinge rod (5) is transmission-connected to the tower-shaped valve core (102) via the amplifying gear (6); and a labor-saving lever (7) is further provided between the amplifying gear (6) and the tower-shaped valve core (102); An oil bag (8) is fixed on the upper surface of the piston (202), and the oil bag (8) is connected to the pressure gauge (3) through an oil pipe. A carry block (9) is provided on the inner wall of the valve cavity (201) and is slidably pressed against the top end of the spring (204).

2. The pipeline pressure relief structure according to claim 1, characterized in that: The inner wall bearing of the equipment box (4) is provided with a rotating shaft (10), one end of the tower-shaped valve core (102) extends into the equipment box (4) and is meshedly connected with the rotating shaft (10), the side of the rotating shaft (10) is meshedly connected with a first arc-shaped rack (11), and the end of the labor-saving lever (7) away from the amplifying gear (6) is fixedly connected with the first arc-shaped rack (11).

3. The pipeline pressure relief structure according to claim 2, characterized in that: The labor-saving lever (7) is hinged to the inner wall of the equipment box (4); a first slide groove (12) is provided on the side of the tower-shaped valve core (102) corresponding to the first arc-shaped rack (11); and the other end of the labor-saving lever (7) is fixedly connected to a second arc-shaped rack (13) corresponding to the amplifying gear (6).

4. The pipeline pressure relief structure according to claim 1, characterized in that: A hinge seat (14) is fixedly connected to the side of the valve stem (203), and the hinge rod (5) is hinged to the valve stem (203) via the hinge seat (14). One end of the hinge rod (5) away from the valve stem (203) is hinged to an advance rack (15), and the advance rack (15) is meshingly connected to the amplifying gear (6).

5. The pipeline pressure relief structure according to claim 1, characterized in that: A second slide groove (16) is provided through the side of the hinge rod (5); a fixed shaft (17) is fixedly connected to the inner wall of the equipment box (4) corresponding to the hinge rod (5); and the hinge rod (5) is arranged between the valve stem (203) and the amplifying gear (6) through the cooperation of the fixed shaft (17) and the second slide groove (16).

6. The pipeline pressure relief structure according to claim 4, characterized in that: A hinge shaft (18) is fixed to one end of the hinge rod (5) close to the advancing rack (15); the hinge rod (5) is hinged to the advancing rack (15) via the hinge shaft (18); and a guide rail (19) is fixed to one side of the amplifying gear (6) corresponding to the advancing rack (15).

7. The pipeline pressure relief structure according to claim 1, characterized in that: The inner wall of the valve cavity (201) is also fixedly connected with a pressure plate (20) corresponding to the oil bag (8), and a guide groove (21) is vertically opened on the inner wall of the valve cavity (201). The carry block (9) is slidably arranged above the spring (204) through the guide groove (21).

8. The pipeline pressure relief structure according to claim 1, characterized in that: The upper and lower surfaces of the carry block (9) are fixedly connected to the limiting sleeve (22), and one end of the spring (204) away from the piston (202) extends into the inner side of the limiting sleeve (22). The inner side of the equipment box (4) is also slidably provided with a carry rod (23) along the guide groove (21) and located above the carry block (9), and the bottom end of the carry rod (23) also extends into the inner side of the limiting sleeve (22) and presses against the upper surface of the carry block (9).

9. The pipeline pressure relief structure according to claim 8, characterized in that: A distance adjusting bolt (24) is passed through the top of the equipment box (4) and the bearing is provided thereon, and the bottom end of the distance adjusting bolt (24) is threadedly connected to the advancing rod (23).

10. A pressure relief valve, characterized in that: A pipeline pressure relief structure as described in any one of claims 1 to 9 is installed, wherein the pressure relief valve is composed of a main valve (1), a pilot valve (2), a pressure gauge (3) and a corresponding flow guide pipe, and the two ends of the main valve (1) are respectively connected to an input pipe and an output pipe to control the delivery pressure of the medium in the pipeline system.

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