Two-way sealing self-pressure-relief ultralow-temperature ball valve

Abstract

The invention relates to the technical field of valve equipment, in particular to a two-way sealing self-pressure-relief ultralow-temperature ball valve which comprises a valve body. A valve seat used for installing a ball valve body provided with a through medium hole is fixed in the valve body in a sealed mode, and the ball valve body is connected with a valve rod arranged in a shaft hole of the valve body in a sealed mode. One end of the valve seat is connected with a pressure control ring structure, the pressure control ring structure is arranged on the inner side of a first pressure relief opening of the valve body in a sealed mode, and the outer side of the first pressure relief opening is connected with a first pressure relief structure. The pressure control ring structure is arranged in the valve body, when the pressure of a medium is increased, impact force generated by the medium can act on the pressure control ring structure, and therefore the impact force of part of the medium is converted into kinetic energy through displacement of the pressure control ring structure, buffering is effectively carried out, and when the pressure exceeds a preset value, the pressure control ring structure is not damaged. When the displacement distance of the pressure control ring structure reaches the preset distance, the first pressure relief opening can be automatically opened, and after the first pressure relief opening is opened, the medium can be subjected to pressure relief buffering through the first pressure relief structure.

Description

Technical Field

[0001] The present invention relates to the technical field of valve equipment, and more specifically to a bidirectional sealing self-pressure relief ultra-low temperature ball valve. Background Art

[0002] Ball valves are used for regulating and controlling fluids and have been widely used in various sectors such as petroleum, chemical industry, power generation, papermaking, atomic energy, aviation, rockets, and people's daily lives. With the development of industry, ball valves have rapidly developed into a major valve type and are widely used in oil refining, long-distance pipelines, chemical industry, papermaking, pharmaceuticals, water conservancy, electricity, municipal administration, steel and other industries, and they play an important role in the national economy. Ball valves are mainly used to cut off or connect the medium in the pipeline, and can also be used for regulating and controlling fluids. They usually include a main valve body, a sub-valve body, a ball core, an inlet valve seat, an outlet valve seat and a valve stem. At least one of the inlet valve seat and the outlet valve seat is used to directly contact the ball core. When the ball valve is used in high-pressure equipment such as hydraulic machinery, hydraulic switches, and natural gas, the moment the valve stem is opened, the instantaneous impact force of the fluid on the ball core is very large, which can easily cause damage to the surface of the ball core, and over time, the entire ball valve will be scrapped. Summary of the invention

[0003] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a bidirectional sealed self-pressure-relieving ultra-low temperature ball valve.

[0004] The technical solution adopted by the present invention is:

[0005] A two-way sealed self-pressure-relieving ultra-low temperature ball valve comprises: a valve body; a valve seat which is sealed and fixed in the valve body and is used to install a ball valve body provided with a through medium hole, the ball valve body being connected to a valve stem which is sealably installed in an axial hole of the valve body; one end of the valve seat is connected to a pressure control ring structure, the pressure control ring structure is sealably arranged on the inner side of a first pressure relief port of the valve body, and the outer side of the first pressure relief port is connected to the first pressure relief structure; the second pressure relief port of the valve body is connected to a second pressure relief structure arranged on the outer side of the valve body; the second pressure relief structure and the first pressure relief structure are respectively arranged on both sides of the ball valve body, and the second pressure relief structure is connected to a conducting pressure relief structure on the valve body.

[0006] Furthermore, the pressure control ring structure includes: a pressure ring sealingly slidably arranged on the inner wall of the valve body, the outer side of the pressure ring is sealed at the inner port of the first pressure relief port, multiple pressure-bearing shafts on one side of the pressure ring are slidably arranged in multiple transverse shaft grooves at one end of the valve seat, a first pressure-bearing spring is provided on the inner side of the pressure-bearing shaft and the transverse shaft groove, and a second pressure-bearing spring is fixedly connected between the pressure ring and the valve seat.

[0007] Furthermore, the inner surface of the pressure ring includes: a first conical surface section, a straight surface section and a second conical surface section, and the diameters of the first conical surface section and the second conical surface section gradually decrease from a position away from the ball valve body to a position close to the ball valve body; the minimum diameter of the first conical surface section is not less than the maximum diameter of the second conical surface section.

[0008] Furthermore, the pressure ring is provided with a second conical surface section at one end which is sealingly slidably arranged in the through hole of the valve seat; an annular sealing ring is provided at one end of the pressure ring close to the ball valve body. When the medium generates pressure on the pressure ring and causes the pressure ring to move toward the ball valve body, the pressure ring gradually releases the blockage of the first pressure relief port, and the annular sealing ring gradually contacts the outer wall of the ball valve body. The outer diameter of the annular sealing ring is larger than the diameter of the through medium hole.

[0009] Furthermore, the first pressure relief structure includes: a pressure relief pipe 1 fixed to the outside of the first pressure relief port, the pressure relief pipe 1 is vertically fixed to the side of the pressure relief pipe 2, a sealing sliding pressure plug is inside the pressure relief pipe 2, the end of the pressure plug away from the pressure relief pipe 2 is connected to a sliding pressure shaft slidably arranged on a certain end cover of the pressure relief pipe, the sliding pressure shaft passes through the shaft body outside the pressure relief pipe 2 and is connected to the pressure seat, and the pressure seat and the bearing ring on the pressure relief pipe 2 are connected by one or more pressure-controlling tension springs.

[0010] Furthermore, the first pressure relief structure also includes: a movable end cover threadedly sealed at one end of the pressure relief pipe close to the valve seat, the center hole of the movable end cover is connected to the inner chamber of the expansion sealing ring installed in the ring groove of the valve body through a pressurized pipe with a control valve, and the expansion sealing ring is tightly fitted at the connection between the valve stem and the axial hole of the valve body.

[0011] Furthermore, the conductive pressure relief structure includes: a conductive tube 1 connected to the conductive hole on the outer wall of the valve body, a conductive tube 2 vertically connected to the conductive tube 1, a conductive plug sealingly sliding in the conductive tube 2 to block the connection between the conductive tube 1 and the conductive tube 2, and the end of the conductive tube 2 close to the second pressure relief structure is connected to the second pressure relief structure through a conductive tube 3; the end of the conductive plug away from the conductive tube 3 is provided with a stud slidably connected to the side end cover of the conductive tube 2, and a conductive compression spring is provided between the conductive plug and the side end cover; the stud is connected to a conductive ring slidably arranged on the outer wall of the valve body, and the conductive pressure regulating plate on the valve body is located on the side of the pressure seat away from the bearing ring.

[0012] Furthermore, the conductive voltage regulating plate includes: a fixed plate fixed on the conductive ring, a sliding shaft on the fixed plate that is slidably matched with the movable plate, a screw that is rotatably matched with the movable plate and is threadedly connected to the fixed plate, and a pressure stabilizing spring is fixed between the voltage regulating rotating block fixed by the screw and the fixed plate.

[0013] Furthermore, the second pressure relief structure includes: an annular pressure relief box connected to the conducting pipe 3, the annular pressure relief box is sleeved on the side of the valve body away from the first pressure relief structure, the top of the annular pressure relief box is connected to the strip pressure relief box through a pressure relief pipe, the lower end of one side of the strip pressure relief box is provided with a drain pipe connected to the inside of the valve body, the drain pipe is located on the side of the ball valve body away from the pressure control ring structure, the upper end of the other side of the strip pressure relief box is provided with a pressure relief outlet, the pressure relief plug with a sealing sliding connection in the strip pressure relief box is blocked at the bottom of the pressure relief outlet, the side of the pressure relief plug away from the drain pipe is connected to a plug shaft slidably arranged on the side of the strip pressure relief box, and a return tension spring is fixedly connected between the side block on the plug shaft and the outer wall of the strip pressure relief box.

[0014] Furthermore, a drainage plug sealingly slidably arranged in the strip-shaped pressure relief box blocks the top of the drainage pipe, and a drainage screw rotatably connected to one end of the drainage plug is threadedly connected to the outer wall of the strip-shaped pressure relief box.

[0015] It can be seen from the above scheme that the beneficial effects of the present invention are:

[0016] In a bidirectional sealed self-pressure-relieving ultra-low-temperature ball valve of the present invention, a pressure-controlling ring structure is provided in the valve body. When the medium pressure increases, the impact force generated by the medium will act on the controllable pressure-controlling ring structure, thereby converting part of the impact force of the medium into kinetic energy through the displacement of the pressure-controlling ring structure, effectively performing buffering, and when the pressure exceeds a preset value, the displacement distance of the pressure-controlling ring structure reaches a preset distance, allowing the first pressure relief port to open automatically. After the first pressure relief port is opened, the medium can be pressure-relieved and buffered through the first pressure relief structure. When the pressure continues to increase, the first pressure relief structure will drive the conducting pressure relief structure to open. The conducting pressure relief structure can allow the medium to pass through the ball valve body and the valve seat and be directly transported to the second pressure relief structure, and be discharged to the outside through the second pressure relief structure, or discharged to the rear valve cavity of the valve body.

[0017] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0019] Figure 1 A schematic diagram of a bidirectional sealed self-pressure relief cryogenic ball valve provided in an embodiment of the present invention Figure 1 ;

[0020] Figure 2 A schematic diagram of a bidirectional sealed self-pressure relief cryogenic ball valve provided in an embodiment of the present invention Figure 2 ;

[0021] Figure 3A cross-sectional view of a bidirectional sealing self-pressure relief cryogenic ball valve provided in an embodiment of the present invention;

[0022] Figure 4 A schematic diagram of a valve seat provided in an embodiment of the present invention;

[0023] Figure 5 A schematic diagram of a pressure control ring structure provided by an embodiment of the present invention;

[0024] Figure 6 A schematic diagram of a first pressure relief structure provided in an embodiment of the present invention;

[0025] Figure 7 A cross-sectional view of a first pressure relief structure provided in an embodiment of the present invention;

[0026] Figure 8 A schematic diagram of a second pressure relief structure provided in an embodiment of the present invention;

[0027] Fig. 9 A cross-sectional view of a second pressure relief structure provided by an embodiment of the present invention;

[0028] Fig.10 A schematic diagram of a conduction pressure relief structure provided by an embodiment of the present invention;

[0029] Fig.11 A cross-sectional view of a conductive pressure relief structure provided by an embodiment of the present invention;

[0030] Icons: valve body 1; ball valve body 2; valve seat 3; valve stem 4; pressure control ring structure 5; pressure ring 501; pressure bearing shaft 502; first pressure bearing spring 503; second pressure bearing spring 504; first pressure relief structure 6; pressure relief pipe 1 601; pressure relief pipe 2 602; pressure plug 603; sliding pressure shaft 604; pressure seat 605; pressure control tension spring 606; moving end cover 607; pressure pipe 608; expansion seal ring 609; load ring 610; second pressure relief Structure 7; annular pressure relief box 701; pressure relief pipe 702; strip pressure relief box 703; discharge pipe 704; pressure relief outlet 705; plug shaft 706; return tension spring 707; discharge plug 708; discharge screw 709; pressure relief plug 710; conductive pressure relief structure 8; conductive pipe one 801; conductive pipe two 802; conductive plug 803; conductive pipe three 804; stud 805; conductive compression spring 806; conductive ring 807; conductive pressure regulating plate 808. DETAILED DESCRIPTION

[0031] In order to clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention, it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] It should be understood that the terms such as “having”, “including” and “comprising” used herein do not exclude the existence or addition of one or more other elements or combinations thereof.

[0033] Example 1

[0034] See also Figure 1-Figure 11 The present invention provides a bidirectional sealed self-pressure-relieving ultra-low temperature ball valve, comprising: a valve body 1; a valve seat 3 sealed and fixed in the valve body 1 for installing a ball valve body 2 provided with a through medium hole, the ball valve body 2 is connected to a valve stem 4 sealed and installed in the axial hole of the valve body 1; one end of the valve seat 3 is connected to a pressure control ring structure 5, the pressure control ring structure 5 is sealingly arranged on the inner side of a first pressure relief port of the valve body 1, and the outer side of the first pressure relief port is connected to a first pressure relief structure 6; the second pressure relief port of the valve body 1 is connected to a second pressure relief structure 7 arranged on the outer side of the valve body 1; the second pressure relief structure 7 and the first pressure relief structure 6 are respectively arranged on both sides of the ball valve body 2, and the second pressure relief structure 7 is connected to a conducting pressure relief structure 8 on the valve body 1.

[0035] The working principle and technical effects of the above technical solution are as follows:

[0036] The present invention provides a bidirectional sealed self-pressure-relieving ultra-low temperature ball valve. In the normal working stage, the medium flows in the valve body 1 through the through medium hole on the ball valve body 2. The operator can control the opening and closing of the ball valve body 2 by rotating the valve stem 4 connected to the ball valve body 2, thereby realizing the regulation of the medium flow rate and flow direction. The valve seat 3 plays the role of fixing the ball valve body 2 and ensuring the sealing between it and the valve body 1 to prevent the medium from leaking during normal working. When the medium pressure increases, the impact force generated by the medium will directly act on the pressure control ring structure 5. Since the pressure control ring structure 5 is sealed and arranged on the inner side of the first pressure relief port of the valve body 1 and can be displaced under the action of pressure, during the displacement process, the pressure control ring structure 5 will Part of the medium impact force on the ball valve body 2 is converted into its own kinetic energy, which acts like a buffer to reduce the direct impact of pressure on the ball valve body 2 and related components, and avoid damage to components due to a sudden increase in pressure; when the medium pressure continues to rise and exceeds the preset value, the displacement distance of the pressure control ring structure 5 will reach the preset distance. At this time, the first pressure relief port will automatically open. The opened first pressure relief port provides an additional flow channel for the medium. The medium can flow through the first pressure relief structure 6 connected to the outside of the first pressure relief port, thereby realizing the first pressure relief buffering and reducing the system pressure to a certain extent; if the medium pressure continues to rise, the first pressure relief structure 6 will drive the conductive pressure relief structure 8 to open. After the conducting pressure relief structure 8 is opened, another additional circulation channel is provided for the medium to realize the second pressure relief buffer, and the medium can bypass the ball valve body 2 and the valve seat 3 through the conducting pressure relief structure 8, and be directly transported from the first pressure relief structure 6 to the second pressure relief structure 7, and the medium is discharged to the external environment through the second pressure relief structure 7, or discharged to the rear valve cavity of the valve body 1, to realize further pressure relief and ensure that the pressure of the whole system is within a safe range; in the present invention, by arranging a pressure control ring structure 5 in the valve body 1, the impact force of the medium is converted into kinetic energy, which effectively alleviates the influence of the sudden change of pressure on the ball valve, reduces the risk of component damage caused by pressure shock, and prolongs the service life of the ball valve; it has a multi-stage pressure relief mechanism. When the pressure exceeds the preset value, the pressure relief ring structure 5 is firstly The first pressure relief structure 6 is used for primary pressure relief. If the pressure continues to rise, the conductive pressure relief structure 8 and the second pressure relief structure 7 are used for secondary pressure relief. The multi-stage pressure relief design can provide effective protection under different pressure conditions to ensure that the system can operate safely and stably under various working conditions. The ball valve has the characteristic of two-way sealing. Regardless of whether the medium flows forward or reversely, the valve seat 3 can ensure good sealing performance to prevent medium leakage, thereby improving the reliability and safety of the system. The ball valve body 2 is made of stainless steel with good low-temperature performance, such as 321 stainless steel or 316L stainless steel. It has high strength and toughness at low temperatures, can withstand pressure and impact in low-temperature environments, and has good corrosion resistance to prevent the medium from corroding the valve body.

[0037] Example 2

[0038] See also Figure 1-Figure 11 The present invention provides a bidirectional sealed self-pressure relief cryogenic ball valve, wherein the pressure control ring structure 5 comprises: a pressure ring 501 sealingly slidably arranged on the inner wall of the valve body 1, the outer side of the pressure ring 501 is sealed at the inner port of the first pressure relief port, multiple pressure-bearing shafts 502 on one side of the pressure ring 501 are slidably arranged in multiple transverse shaft grooves at one end of the valve seat 3, and a first pressure-bearing spring 503 is arranged on the inner side of the pressure-bearing shaft 502 and the transverse shaft groove, and a second pressure-bearing spring 504 is fixedly connected between the pressure ring 501 and the valve seat 3. The inner side surface of the pressure ring 501 comprises: a first conical surface section, a straight surface section and a second conical surface section, and the diameters of the first conical surface section and the second conical surface section are gradually reduced from the position away from the ball valve body 2 to the position close to the ball valve body 2; the minimum diameter of the first conical surface section is not less than the maximum diameter of the second conical surface section.

[0039] The working principle and technical effects of the above technical solution are as follows:

[0040] In a bidirectional sealed self-relieving ultra-low temperature ball valve provided by the present invention, when the medium pressure exceeds a preset value, the pressure ring 501 moves toward the valve seat 3, on the one hand compressing the second pressure-bearing spring 504, and on the other hand the pressure-bearing shaft 502 slides in the transverse shaft groove and compresses the first pressure-bearing spring 503. The buffering design of the multi-stage spring can effectively convert the medium pressure into the elastic potential energy of the spring, avoiding excessive impact of the pressure on the ball valve body 2 at the moment, protecting the various components inside the ball valve, and extending the service life of the ball valve; the combination of different springs can gradually play a role according to the size of the pressure. When the pressure is small, only some springs may participate in buffering; as the pressure increases, more springs start to work, achieving precise buffering of the pressure and improving Buffering efficiency; the diameter of the first conical section and the second conical section on the inner side of the pressure ring 501 gradually decreases from the position away from the ball valve body 2 to the position close to the ball valve body 2, so that when the medium passes through the pressure ring 501, the flow channel gradually narrows. According to the principle of fluid mechanics, the flow velocity will increase accordingly, thereby reducing the obstruction to the medium, reducing energy loss, and improving the flow efficiency of the medium; the conical surface design can also make the medium gather inward, which is conducive to the medium passing through the ball valve body 2 more concentratedly, avoiding the dispersed flow of the medium in the valve body 1, reducing the generation of turbulence, and further improving the flow stability of the medium; the outer side of the pressure ring 501 is blocked at the inner port of the first pressure relief port, which can effectively prevent medium leakage under normal working conditions, ensuring the double The ball valve 501 has a good sealing performance. When the pressure exceeds the preset value, the movement of the pressure ring 501 triggers the pressure relief process, and works together with the self-pressure relief system of the entire ball valve to ensure that the pressure can be relieved in time and effectively when the pressure is abnormal, thereby ensuring the safe operation of the system. Since the medium is gathered inward in the pressure ring 501, the impurities in the medium will also be concentrated along the flow direction of the medium, reducing the possibility of impurities deposited in other parts of the valve body 1, improving the ball valve's ability to resist impurities, and reducing the risk of ball valve failure due to impurity blockage, which is particularly suitable for media environments containing impurities. When the pressure decreases, the pressure ring 501 can be reset under the elastic force of multiple first pressure-bearing springs 503 and second pressure-bearing springs 504. At this time, the pressure ring 501 can be used to The cooperation with the first conical surface section scrapes the inner wall of the valve body 1, reducing the probability of impurities accumulating near the ball valve body 2 of the valve body 1, and reducing the blockage or unstable sealing caused by impurities accumulation at the connection between the ball valve body 2 and the valve seat 3; in addition, in an ultra-low temperature environment, the physical properties of the medium (such as viscosity, etc.) will change, which may affect the flow and pressure characteristics of the medium, and the special inner side design of the pressure ring 501 enables the medium to maintain a good flow state even at low temperatures. The conical surface design helps to reduce the contact area between the medium and the inner wall of the pressure ring 501, reducing the problems of medium adhesion and increased flow resistance caused by low temperature, so that the ball valve can still work stably in an ultra-low temperature environment, broadening the use range of the ball valve in different temperature environments.

[0041] The pressure ring 501 is provided with a second conical surface section at one end which is sealingly slidably arranged in the through hole of the valve seat 3; an annular sealing ring is provided at one end of the pressure ring 501 close to the ball valve body 2. When the medium generates pressure on the pressure ring 501 and causes the pressure ring 501 to move toward the direction of the ball valve body 2, the pressure ring 501 gradually releases the blockage of the first pressure relief port, and the annular sealing ring gradually contacts the outer wall of the ball valve body 2. The outer diameter of the annular sealing ring is larger than the diameter of the through medium hole.

[0042] The working principle and technical effects of the above technical solution are as follows:

[0043] In a bidirectional sealing self-pressure relief ultra-low temperature ball valve provided by the present invention, when the ball valve body 2 is in an open state, under high pressure, the medium generates pressure on the pressure ring 501 to make the pressure ring 501 move toward the ball valve body 2, and the annular sealing ring gradually contacts the outer wall of the ball valve body 2. The greater the pressure, the higher the contact tightness, which effectively reduces the probability of leakage between the ball valve body 2 and the valve seat 3 and improves the sealing stability.

[0044] When the ball valve body 2 is in a closed state, the annular sealing ring gradually contacts the outer wall of the ball valve body 2 under high pressure, which can also improve the sealing performance, reduce the leakage probability, and allow the medium to stably enter the first pressure relief structure 6 through the first pressure relief port.

[0045] In a bidirectional sealed self-relieving ultra-low temperature ball valve provided by the present invention, the adaptive sealing structure of the annular sealing ring and the ball valve body 2 can automatically adjust the sealing degree according to the actual pressure conditions, ensuring that under different high-pressure working conditions, the leakage probability between the ball valve body and the valve seat can be effectively reduced, greatly improving the stability and reliability of the seal; the outer diameter of the annular sealing ring is larger than the diameter of the through medium hole, and can completely cover the possible leakage path; when the annular sealing ring contacts the outer wall of the ball valve body, it is like a barrier to prevent the medium from leaking out from the gap between the ball valve body and the valve seat, further strengthening the sealing effect. In an ultra-low temperature environment, the physical properties of the material will change, and the sealing performance may also be affected. The sealing sliding cooperation between the pressure ring and the valve seat and the design of the annular sealing ring in this scheme can maintain the stability of the structure under low temperature conditions. The pressure ring slides in a sealed manner in the through hole of the valve seat, and its normal operation will not be affected by the shrinkage or deformation of the material caused by the low temperature, ensuring that a good sealing effect can still be achieved in a low temperature environment.

[0046] Example 3

[0047] See also Figure 1-Figure 11The present invention provides a bidirectional sealed self-pressure relief ultra-low temperature ball valve, wherein the first pressure relief structure 6 includes: a pressure relief pipe 601 fixed on the outside of the first pressure relief port, the pressure relief pipe 601 is vertically fixed to the side of the pressure relief pipe 602, and a sealing sliding pressure plug 603 is inside the pressure relief pipe 602. The end of the pressure plug 603 away from the pressure relief pipe 602 is connected to a sliding pressure shaft 604 slidably arranged on the fixed end cover of the pressure relief pipe 601. The sliding pressure shaft 604 passes through the shaft body outside the pressure relief pipe 602 and is connected to a pressure seat 605. The pressure seat 605 is connected to a bearing ring 610 on the pressure relief pipe 602 by one or more pressure control tension springs 606.

[0048] The working principle and technical effects of the above technical solution are as follows:

[0049] In a bidirectional sealed self-pressure relief ultra-low temperature ball valve provided by the present invention, when the medium pressure exceeds a preset value, the pressure ring 501 moves toward the valve seat 3, and after the blockage of the first pressure relief port is released, the medium can enter the pressure relief pipe 1 601 through the first pressure relief port, and enter the pressure relief pipe 2 602 through the pressure relief pipe 1 601. The medium entering the pressure relief pipe 2 602 can generate pressure on the pressure plug 603, so that the pressure plug 603 drives the sliding pressure shaft 604 to slide outward, and drives the pressure seat 605 to move away through the sliding pressure shaft 604. It moves in the direction away from the pressure relief pipe 602, thereby stretching multiple pressure-controlled tension springs 606 through the pressure seat 605. The number of pressure-controlled tension springs 606 can be designed according to actual needs. When it is necessary to open under different pressure conditions, different numbers of pressure-controlled tension springs 606 are installed. The greater the opening pressure, the greater the number of pressure-controlled tension springs 606. The spring seats at both ends of the pressure-controlled tension springs 606 are connected to the pressure seat 605 and the bearing ring 610 through the cooperation of bolts and nuts, which is easy to install or disassemble, thereby improving the convenience of adjusting the opening pressure.

[0050] The first pressure relief structure 6 also includes: a movable end cover 607 threadedly sealed at one end of the pressure relief pipe 602 near the valve seat 3, the center hole of the movable end cover 607 is connected to the inner chamber of the expansion seal ring 609 installed in the annular groove of the valve body 1 through a pressurized pipe 608 with a control valve, and the expansion seal ring 609 is tightly fitted at the connection between the valve stem 4 and the axial hole of the valve body 1. When the control valve is opened, the medium entering the pressure relief pipe 602 can also enter the inner chamber of the expansion seal ring 609 through the pressurized pipe 608, so that the expansion seal ring 609 expands. The expansion seal ring 609 is made of low-temperature resistant rubber. After the expansion seal ring 609 expands, it can fit more closely with the connection between the valve stem 4 and the axial hole of the valve body 1, thereby improving the sealing effect of the connection between the valve stem 4 and the axial hole of the valve body 1, and further reducing the probability of leakage when the pressure increases.

[0051] Example 4

[0052] See also Figure 1-Figure 11The present invention provides a bidirectional sealed self-pressure-relieving ultra-low temperature ball valve, wherein the conducting pressure-relieving structure 8 comprises: a conducting pipe 1 801 connected to a conducting hole on an outer wall of a valve body 1, a conducting pipe 2 802 vertically connected to the conducting pipe 1 801, a conducting plug 803 sealingly sliding in the conducting pipe 2 802 to block the connection between the conducting pipe 1 801 and the conducting pipe 2 802, and an end of the conducting pipe 2 802 close to the second pressure-relieving structure 7 is connected to the second pressure-relieving structure 7 through a conducting pipe 3 804; an end of the conducting plug 803 away from the conducting pipe 3 804 is provided with a stud 805 slidably connected to a side end cover of the conducting pipe 2 802, and a conducting compression spring 806 is provided between the conducting plug 803 and the side end cover; the stud 805 is connected to a conducting ring 807 slidably arranged on the outer wall of the valve body 1, and a conducting pressure-regulating plate 808 on the valve body 1 is located on a side of the pressure seat 605 away from the bearing ring 610. The conduction voltage regulating plate 808 includes: a fixed plate fixed on the conduction ring 807, a sliding shaft on the fixed plate that is slidably matched with the movable plate, a screw that is rotatably matched with the movable plate and is threadedly connected to the fixed plate, and a voltage regulating rotating block fixed to the screw and a pressure stabilizing spring fixed between the fixed plate.

[0053] The working principle and technical effects of the above technical solution are as follows:

[0054] In a bidirectional sealed self-pressure-relieving ultra-low-temperature ball valve provided by the present invention, when the medium pressure is too large, the pressure seat 605 is driven to move to a preset distance, so that the pressure seat 605 contacts the conducting pressure regulating plate 808 on the conducting ring 807. As the pressure seat 605 continues to move, the conducting ring 807 can be pressed to move on the outer wall of the valve body 1 in a direction away from the pressure relief pipe 602. At this time, the conducting ring 807 drives multiple studs 805 connected thereto to move in a direction away from the conducting pipe 802, thereby driving multiple conducting plugs 803 to release the blocking of multiple conducting holes. At this time, the medium in the valve body 1 can enter the conducting pipe 1 801 and the conducting pipe 2 802 through the conducting holes, providing an additional circulation channel for the medium, realizing a second pressure relief buffer, and the medium can bypass the ball valve body 2 and the valve seat 3 through the conducting pressure relief structure 8, and be directly transported from the first pressure relief structure 6 to the second pressure relief structure 7, thereby reducing the influence of the ball valve body 2 and the valve seat 3 structure on the medium channel in the valve body 1.

[0055] Example 5

[0056] See also Figure 1-Figure 11The present invention provides a bidirectional sealed self-pressure relief cryogenic ball valve, wherein the second pressure relief structure 7 comprises: an annular pressure relief box 701 connected to the conducting pipe 3 804, the annular pressure relief box 701 is sleeved on the side of the valve body 1 away from the first pressure relief structure 6, the top of the annular pressure relief box 701 is connected to the strip pressure relief box 703 through the pressure relief pipe 702, and the lower end of one side of the strip pressure relief box 703 is provided with a discharge pipe 704 connected to the inside of the valve body 1, and the discharge pipe 70 4 is located on the side of the ball valve body 2 away from the pressure control ring structure 5, and a pressure relief outlet 705 is provided at the upper end of the other side of the strip pressure relief box 703. A pressure relief plug 710 that is sealed and slidably connected in the strip pressure relief box 703 blocks the bottom of the pressure relief outlet 705. The side of the pressure relief plug 710 that is away from the discharge pipe 704 is connected to a plug shaft 706 that is slidably arranged on the side of the strip pressure relief box 703. A return tension spring 707 is fixedly connected between the side block on the plug shaft 706 and the outer wall of the strip pressure relief box 703. A discharge plug 708 that is sealed and slidably arranged in the strip pressure relief box 703 blocks the top of the discharge pipe 704, and a discharge screw 709 that is rotatably connected to one end of the discharge plug 708 is threadedly connected to the outer wall of the strip pressure relief box 703.

[0057] The working principle and technical effects of the above technical solution are as follows:

[0058] In a bidirectional sealed self-pressure-relieving ultra-low temperature ball valve provided by the present invention, when the ball valve body 2 is in a closed state, the medium can bypass the ball valve body 2 and the valve seat 3 through the conductive pressure relief structure 8 and enter the second pressure relief structure 7, and the medium can be stored through the annular pressure relief box 701 of the second pressure relief structure 7. When the storage capacity is too large, the medium in the annular pressure relief box 701 enters the strip pressure relief box 703 through the pressure relief pipe 702, thereby increasing the storage capacity and ensuring the pressure relief effect. If the pressure exceeds the maximum value, the medium in the strip pressure relief box 703 generates pressure on the pressure relief plug 710, so that it is no longer blocked at the pressure relief outlet 705, and the pressure relief outlet 705 is opened. , the medium can overflow through the pressure relief outlet 705. If you want to reduce the amount of medium overflow, you can rotate the discharge screw 709 to change its contact position with the outer wall of the strip pressure relief box 703, drive the discharge plug 708 to slide in the strip pressure relief box 703, so that the discharge plug 708 releases the blockage of the discharge pipe 704, and the medium can enter the output end of the valve body 1 through the discharge pipe 704; when the ball valve body 2 is in the open state, the discharge plug 708 releases the blockage of the discharge pipe 704, and the medium can enter the output end of the valve body 1 through the discharge pipe 704, forming multiple auxiliary medium channels, increasing the medium circulation speed and flow rate, thereby reducing the pressure.

[0059] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0060] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0061] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation methods. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A bidirectional sealed self-pressure relief cryogenic ball valve, characterized in that: include: Valve body; a valve seat for installing a ball valve body with a through medium hole is sealed and fixed in the valve body, and the ball valve body is connected to a valve stem sealably installed in the axial hole of the valve body; one end of the valve seat is connected to a pressure control ring structure, and the pressure control ring structure is sealably arranged on the inner side of a first pressure relief port of the valve body, and the outer side of the first pressure relief port is connected to the first pressure relief structure; the second pressure relief port of the valve body is connected to a second pressure relief structure arranged on the outer side of the valve body; the second pressure relief structure and the first pressure relief structure are respectively arranged on both sides of the ball valve body, and the second pressure relief structure is connected to the conduction pressure relief structure on the valve body.

2. A bidirectional sealing self-pressure relief cryogenic ball valve according to claim 1, characterized in that: The pressure control ring structure includes: a pressure ring sealingly slidably arranged on the inner wall of the valve body, the outer side of the pressure ring is sealed at the inner port of the first pressure relief port, multiple pressure-bearing shafts on one side of the pressure ring are slidably arranged in multiple transverse shaft grooves at one end of the valve seat, a first pressure-bearing spring is arranged on the inner side of the pressure-bearing shaft and the transverse shaft groove, and a second pressure-bearing spring is fixedly connected between the pressure ring and the valve seat.

3. A bidirectional sealing self-pressure relief cryogenic ball valve according to claim 2, characterized in that: The inner surface of the pressure ring includes: a first conical surface section, a straight surface section and a second conical surface section. The diameters of the first conical surface section and the second conical surface section gradually decrease from a position away from the ball valve body to a position close to the ball valve body; the minimum diameter of the first conical surface section is not less than the maximum diameter of the second conical surface section.

4. A bidirectional sealing self-pressure relief cryogenic ball valve according to claim 3, characterized in that: The pressure ring is provided with an end of the second conical surface section which is sealingly slidably arranged in the through hole of the valve seat; an annular sealing ring is provided at one end of the pressure ring close to the ball valve body. When the medium generates pressure on the pressure ring and causes the pressure ring to move toward the ball valve body, the pressure ring gradually releases the blockage of the first pressure relief port, and the annular sealing ring gradually contacts the outer wall of the ball valve body. The outer diameter of the annular sealing ring is greater than the diameter of the through medium hole.

5. The bidirectional sealing self-pressure relief cryogenic ball valve according to claim 1, characterized in that: The first pressure relief structure includes: a pressure relief pipe 1 fixed on the outside of the first pressure relief port, the pressure relief pipe 1 is vertically fixed to the side of the pressure relief pipe 2, a sealing sliding pressure plug is inside the pressure relief pipe 2, the end of the pressure plug away from the pressure relief pipe 2 is connected to a sliding pressure shaft slidably arranged on a certain end cover of the pressure relief pipe, the sliding pressure shaft passes through the shaft body outside the pressure relief pipe 2 and is connected to a pressure seat, and the pressure seat and the bearing ring on the pressure relief pipe 2 are connected by one or more pressure-controlling tension springs.

6. A bidirectional sealing self-pressure relief cryogenic ball valve according to claim 5, characterized in that: The first pressure relief structure also includes: a movable end cover threadedly sealed at one end of the pressure relief pipe close to the valve seat, the center hole of the movable end cover is connected to the inner chamber of the expansion sealing ring installed in the ring groove of the valve body through a pressurized pipe with a control valve, and the expansion sealing ring is tightly fitted at the connection between the valve stem and the axial hole of the valve body.

7. A bidirectional sealing self-pressure relief cryogenic ball valve according to claim 5, characterized in that: The conducting pressure relief structure includes: a conducting pipe 1 connected to a conducting hole on the outer wall of the valve body, a conducting pipe 2 vertically connected to the conducting pipe 1, a conducting plug sealingly sliding in the conducting pipe 2 to block the connection between the conducting pipe 1 and the conducting pipe 2, and an end of the conducting pipe 2 close to the second pressure relief structure is connected to the second pressure relief structure through a conducting pipe 3; an end of the conducting plug away from the conducting pipe 3 is provided with a stud slidably connected to the side end cover of the conducting pipe 2, and a conducting compression spring is provided between the conducting plug and the side end cover; the stud is connected to a conducting ring slidably arranged on the outer wall of the valve body, and the conducting pressure regulating plate on the valve body is located on the side of the pressure seat away from the bearing ring.

8. A bidirectional sealing self-pressure relief cryogenic ball valve according to claim 7, characterized in that: The conduction voltage regulating plate comprises: a fixed plate fixed on the conduction ring, a sliding shaft on the fixed plate that is slidably matched with the movable plate, a screw that is rotatably matched with the movable plate and is threadedly connected to the fixed plate, and a voltage regulating rotating block fixed to the screw and a pressure stabilizing spring that is fixed between the fixed plate.

9. A bidirectional sealing self-pressure relief cryogenic ball valve according to claim 7, characterized in that: The second pressure relief structure includes: an annular pressure relief box connected to the conducting pipe three, the annular pressure relief box is sleeved on the side of the valve body away from the first pressure relief structure, the top of the annular pressure relief box is connected to the strip pressure relief box through a pressure relief pipe, the lower end of one side of the strip pressure relief box is provided with a drain pipe connected to the inside of the valve body, the drain pipe is located on the side of the ball valve body away from the pressure control ring structure, the upper end of the other side of the strip pressure relief box is provided with a pressure relief outlet, the pressure relief plug with a sealing sliding connection in the strip pressure relief box is blocked at the bottom of the pressure relief outlet, the side of the pressure relief plug away from the drain pipe is connected to a plug shaft slidably arranged on the side of the strip pressure relief box, and a return tension spring is fixedly connected between the side block on the plug shaft and the outer wall of the strip pressure relief box.

10. A bidirectional sealing self-pressure relief cryogenic ball valve according to claim 9, characterized in that: The drainage plug which is sealingly slidably arranged in the strip-shaped pressure relief box blocks the top of the drainage pipe, and the drainage screw which is rotatably connected to one end of the drainage plug is threadedly connected to the outer wall of the strip-shaped pressure relief box.

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