Low-temperature valve for low-temperature oil well pipeline

Abstract

The invention relates to the technical field of oil well pipeline valves, and particularly discloses a low-temperature valve for a low-temperature oil well pipeline. Comprising a valve seat, an inner cavity is formed in the valve seat, a ball body is rotationally connected into the inner cavity, a sealing mechanism is arranged on each of the two sides of the ball body, a shaft sleeve is fixedly connected to the upper side of the valve seat, an air outlet is formed in the circumferential surface of the shaft sleeve, a valve rod and a pressing type exhaust mechanism are arranged in the shaft sleeve, and the valve rod is rotationally connected into the shaft sleeve; the valve rod is detachably connected with the ball body, an air outlet channel is formed in the valve rod, a protective shell is slidably connected to the upper side of the shaft sleeve, a switching mechanism and a limiting mechanism are arranged in the protective shell, and a grip is fixedly connected to the side of the protective shell; part of residual natural gas in the inner cavity can be discharged, the leakage risk can be reduced by timely discharging the residual gas, the internal sealing performance of the valve seat is protected, and the safety of personnel and equipment is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of oil well pipeline valves, and more particularly to a cryogenic valve for cryogenic oil well pipelines. Background Art

[0002] Oil well pipelines are mainly used to transport crude oil and natural gas at the bottom of oil wells to the ground. These pipelines are an essential part of the oil and gas extraction process. Through precise design and installation, they ensure that crude oil and natural gas can be safely and efficiently transported from underground to the ground for subsequent processing and utilization. The working principle of cryogenic valves is mainly to control the flow rate and pressure of the medium by adjusting the opening of the valve to achieve the desired temperature control effect.

[0003] Chinese invention patent with the publication number CN105102133A discloses a cryogenic valve, including: a first port, a second port, a valve body, a valve stem, a sealing member, a valve element, and a housing. The valve body includes a valve seat that defines a fluid orifice in fluid communication with the first port. The valve stem is configured to engage with the valve body, wherein at least one of the valve stem and the valve body forms an internal valve cavity. The valve element is positioned within the internal valve cavity. The valve element is also configured to bias the sealing member against the orifice to substantially block the flow through the orifice and the first port. The biasing is controlled in response to the control of the valve element by a valve actuator. A passage is configured to allow fluid to flow along the longitudinal axis through at least one of the valve stem and the valve element. The housing is configured to be substantially sealed and enclose at least a portion of the valve body and the valve stem. The housing forms an internal housing cavity that is configured to thermally isolate the exterior of the valve body and the valve stem from the housing.

[0004] When the existing cryogenic ball valve transports natural gas, since natural gas is in a gaseous state, when the sphere inside the ball valve rotates to close the switch, a part of the natural gas will be brought into the chamber inside the sphere, resulting in some natural gas remaining in the internal chamber of the ball valve. The volume of the gas will change with temperature. When the air temperature rises, the natural gas inside the sphere is likely to expand, which will affect the sealing performance of the ball valve. Moreover, when opening the natural gas ball valve, the expanded natural gas ejected from the inside of the sphere is likely to cause fluctuations in the natural gas smoothly transported in the pipeline, which will increase the wear between the sealing structures and affect the service life of the connection between the ball valve and the pipeline. For this reason, we propose a cryogenic valve for cryogenic oil well pipelines. Summary of the Invention

[0005] In order to overcome the above-mentioned defects of the prior art, the present invention provides a cryogenic valve for cryogenic oil well pipelines to solve the problems existing in the above-mentioned background art.

[0006] The present invention provides the following technical solutions: a low-temperature valve for a low-temperature oil well pipeline, comprising a valve seat, an inner cavity is provided in the valve seat, a ball is rotatably connected in the inner cavity, a group of sealing mechanisms are provided on both sides of the ball, a shaft sleeve is fixedly connected to the upper side of the valve seat, an air outlet is provided on the circumferential surface of the shaft sleeve, a valve stem and a press-type exhaust mechanism are provided in the shaft sleeve, the valve stem is rotatably connected in the shaft sleeve, the valve stem and the ball are detachably connected, an air outlet channel is provided in the valve stem, a protective shell is slidably connected to the upper side of the shaft sleeve, a switch mechanism and a limit mechanism are provided in the protective shell, and a handle is fixedly connected to the side of the protective shell; The push-type exhaust mechanism includes a direct-connection tube, a second sealing ring, a third sealing ring, a second spring, an extension rod and a straight-through hole. The direct-connection tube is rotatably and slidably connected to the valve stem. The second sealing ring is embedded in the circumferential surface of the direct-connection tube. The bottom of the direct-connection tube is sleeved on the upper end of the valve stem. The third sealing ring is embedded in the inner wall of the direct-connection tube. The second spring is sleeved on the circumferential surface of the valve stem and is located on the lower side of the direct-connection tube. The circumferential surface of the direct-connection tube is provided with a straight-through hole.

[0007] Furthermore, the switch mechanism includes a worm wheel and a worm, the worm wheel is fixedly connected to the circumferential surface of the extension rod, the worm is rotatably connected between the inner walls of the protective shell, the worm is meshed with the worm wheel, and one end of the worm passes through the protective shell and is fixedly connected to a handwheel.

[0008] Furthermore, the limiting mechanism includes a blocking rod and a follower rod, wherein two blocking rods are provided and fixedly connected to the lower inner wall of the protective shell, the follower rod is fixedly connected to the upper end of the extension rod, and the moving range of the end of the follower rod is located between the two blocking rods.

[0009] Furthermore, each group of the sealing mechanism includes a sealing body, a first sealing ring and a first spring. The sealing body is embedded in the inner cavity, the first sealing ring is embedded in the circumferential surface of the sealing body, and a plurality of mounting holes are opened on the side of the sealing body away from the sphere, and a first spring is installed in each of the mounting holes.

[0010] Furthermore, a sliding block is fixedly connected to the inner wall of the direct connection tube, a sliding groove is provided on the circumferential surface of the valve stem, and the sliding block is slidably connected in the sliding groove.

[0011] Furthermore, a slot is provided on the upper side of the sphere, and a positioning block is provided at the bottom of the valve stem, and the positioning block is inserted into the slot from top to bottom.

[0012] Furthermore, an auxiliary shaft is fixedly connected to the bottom of the valve seat, a concave surface is arranged on the upper end of the auxiliary shaft, and the ball is rotatably connected to the upper side of the concave surface.

[0013] Furthermore, two third sealing rings are provided, one end of the air outlet channel is located in the inner cavity, the other end of the air outlet channel is consistent with the height of the air outlet and is located between the two third sealing rings, and the straight through hole is lowered to between the air outlet channel and the air outlet to connect the air outlet channel and the air outlet.

[0014] Technical effects and advantages of the present invention: 1. The present invention is provided with a channel consisting of an air outlet channel, a straight hole and an air outlet, which is conducive to pressing the handle to move the extension rod downward when the ball is closed, and the straight-connecting tube and the straight hole move downward accordingly, so that the straight hole is located between the air outlet channel and the air outlet. At this time, the air outlet channel, the straight hole and the air outlet form a channel, and the natural gas remaining in the inner cavity is discharged from the air outlet channel, the straight hole to the air outlet, so that part of the natural gas remaining in the inner cavity can be discharged. Timely discharge of residual gas can reduce the risk of leakage, protect the internal sealing of the valve seat, and ensure the safety of personnel and equipment.

[0015] 2. The present invention is provided with a limit mechanism, which is conducive to the follower rod rotating with the extension rod when the ball is switched, and the blocking rod limits the rotation range to 90 degrees, so as to limit the extension rod to rotate 90 degrees, that is, to rotate within the switching range. The ball can accurately switch from a fully open state to a fully closed state, or from a fully closed state to a fully open state, so as to achieve complete flow or complete cutoff of the fluid and ensure that the valve achieves the best sealing effect when it is closed. By accurately controlling the rotation angle of the valve, it can ensure that the sealing surface of the valve and the valve seat are closely fitted to form an effective sealing pair to prevent fluid leakage.

[0016] 3. The present invention is provided with a switch mechanism, which is conducive to the deceleration effect, can more accurately adjust the angle of the ball rotation, adjust the medium flow, meet different process requirements, and utilize the self-locking properties of the worm and worm wheel to prevent accidental opening or closing under specific conditions, thereby improving safety.

[0017] 4. The present invention is provided with a sealing mechanism, which is conducive to the first spring being able to apply a certain pre-tightening force to the sealing body, so that it can fit more closely to the surface of the ball, thereby effectively preventing gas leakage. This tightness can be maintained even when the connecting parts are deformed, vibrated, or thermally expanded and contracted. When the contact surface between the sealing body and the ball is worn due to long-term use, the elastic force of the first spring can push the sealing body to move toward the ball, perform a certain degree of automatic compensation, maintain the sealing effect, and extend the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0019] Figure 2 It is a bottom view structural schematic diagram of the present invention.

[0020] Figure 3 It is a cross-sectional structural schematic diagram of the present invention.

[0021] Figure 4 It is a schematic diagram of the spherical structure of the present invention.

[0022] Figure 5 It is a schematic diagram of the sealing mechanism of the present invention.

[0023] Figure 6 It is a schematic diagram of the auxiliary shaft structure of the present invention.

[0024] Figure 7 It is a schematic diagram of the shaft sleeve structure of the present invention.

[0025] Figure 8 For the present invention Figure 7 Schematic diagram of the cross-sectional structure.

[0026] Fig. 9 It is a schematic diagram of the valve stem structure of the present invention; Fig.10 It is a schematic diagram of the push-type exhaust mechanism of the present invention; Fig.11 Schematic diagram of the switch mechanism of the present invention.

[0027] The accompanying drawings are marked as follows: 1. valve seat; 101. inner cavity; 2. sphere; 201. slot; 3. sealing mechanism; 301. sealing body; 302. first sealing ring; 303. first spring; 304. mounting hole; 4. shaft sleeve; 401. air outlet; 5. auxiliary shaft; 501. concave surface; 6. valve stem; 601. positioning block; 602. slide groove; 7. push-type exhaust mechanism; 701. direct connection cylinder; 702. second sealing ring; 703. third sealing ring; 704. second spring; 705. extension rod; 706. slider; 707. straight through hole; 8. switch mechanism; 801. worm gear; 802. worm; 803. handwheel; 9. limiting mechanism; 901. blocking rod; 902. follow-up rod; 10. air outlet channel; 11. protective shell; 12. handle. DETAILED DESCRIPTION

[0028] The technical solution of the present invention will be clearly and completely described below in conjunction with the drawings in the present invention. In addition, the forms of the various structures recorded in the following embodiments are only examples. The cryogenic valve for a cryogenic oil well pipeline involved in the present invention is not limited to the various structures recorded in the following embodiments. All other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention.

[0029] Reference Figure 1-11The present invention provides a cryogenic valve for a cryogenic oil well pipeline, comprising a valve seat 1, an inner cavity 101 is arranged in the valve seat 1, a ball 2 is rotatably connected in the inner cavity 101, a set of sealing mechanisms 3 are arranged on both sides of the ball 2, a shaft sleeve 4 is fixedly connected to the upper side of the valve seat 1, an air outlet 401 is arranged on the circumferential surface of the shaft sleeve 4, a valve stem 6 and a press-type exhaust mechanism 7 are arranged in the shaft sleeve 4, the valve stem 6 is rotatably connected in the shaft sleeve 4, the valve stem 6 and the ball 2 are detachably connected, an air outlet channel 10 is arranged in the valve stem 6, a protective shell 11 is slidably connected to the upper side of the shaft sleeve 4, a switch mechanism 8 and a limit mechanism 9 are arranged in the protective shell 11, and a handle 12 is fixedly connected to the side of the protective shell 11; The push-type exhaust mechanism 7 includes a direct-connection tube 701, a second sealing ring 702, a third sealing ring 703, a second spring 704, an extension rod 705 and a straight-through hole 707. The direct-connection tube 701 is rotatably and slidably connected to the valve stem 6. The second sealing ring 702 is embedded in the circumferential surface of the direct-connection tube 701. The bottom of the direct-connection tube 701 is sleeved on the upper end of the valve stem 6. The third sealing ring 703 is embedded in the inner wall of the direct-connection tube 701. The second spring 704 is sleeved on the circumferential surface of the valve stem 6 and is located at the lower side of the direct-connection tube 701. The circumferential surface of the direct-connection tube 701 is provided with a straight-through hole 707. In this embodiment, it is necessary to specifically explain that: the inner cavity 101 is used to install the ball 2 and the sealing mechanism 3, the upper side of the ball 2 is provided with a slot 201, the bottom of the valve stem 6 is provided with a positioning block 601, the positioning block 601 is inserted into the slot 201 from top to bottom, the sealing mechanism 3 is close to the two end outlets of the valve seat 1, the ball 2 is located between the two sets of sealing mechanisms 3 to assist the ball 2 in sealing, the shaft sleeve 4 is used to support the valve stem 6 and the direct connection cylinder 701 to rotate, the switch mechanism 8 is used to drive the ball 2 to rotate, and the worm 8 is driven by rotating the hand wheel 803 02 rotates, the worm 802 drives the worm wheel 801 to rotate, the worm wheel 801 drives the extension rod 705 to rotate, the extension rod 705 drives the direct connection tube 701 to rotate, the direct connection tube 701 drives the valve stem 6 to rotate, the valve stem 6 drives the positioning block 601 to rotate, and finally drives the ball 2 to rotate, realizing the function of controlling the switch of the ball 2. The use of the worm wheel 801 and the worm 802 mainly plays the role of deceleration, and the gear reduction ratio range is 4:1-10:1, which can more accurately adjust the rotation angle of the ball 2 and adjust the medium flow to meet different process requirements; It is important that: during the process of the ball 2 rotating to realize the switch, a part of the natural gas will be brought into the inner cavity 101, and the volume of the gas will change with the temperature. When the air temperature rises, the natural gas in the inner cavity 101 will easily expand, which will affect the sealing of the overall structure. Moreover, when the ball 2 is opened, the natural gas expanded in the inner cavity 101 will be ejected, which will easily cause fluctuations in the natural gas smoothly transported in the valve seat 1. Repeated multiple times will easily cause damage to the inner wall of the valve seat 1 and the pipeline, affecting the service life of the connection between the valve seat 1 and the pipeline, and may seriously cause leakage, which is dangerous. In this scheme, an air outlet channel 10 is designed on the shaft sleeve 4, one end of the air outlet channel 10 is located in the inner cavity 101, and the other end of the air outlet channel 10 is at the same height as the air outlet 401. When the ball 2 is closed, the positions of the air outlet channel 10 and the air outlet 401 are concentric. At this time, the air outlet channel 10 is controlled to be connected with the air outlet 401, so that part of the natural gas remaining in the inner cavity 101 can be discharged. Timely discharge of residual gas can reduce the risk of leakage, protect the internal sealing of the valve seat 1, and ensure the safety of personnel and equipment. Preferably, a dustproof net is installed inside the air outlet 401 to prevent external dust from entering while maintaining the ventilation function; Preferably, a second spring 704 is designed in the valve stem 6, and the second spring 704 will be compressed when the direct connection tube 701 descends. After the gas is discharged, the handle 12 is released. Under the elastic action of the second spring 704, the direct connection tube 701 and the straight hole 707 return to their original positions, which will not affect the normal gas transmission function of the valve seat 1. Two third sealing rings 703 are designed near the gas outlet 401 of the gas outlet channel 10, and the outlet of the gas outlet channel 10 is located between the two third sealing rings 703, which can effectively prevent gas from entering the gap between the valve stem 6 and the push-type exhaust mechanism 7. The second sealing ring 702 is embedded and installed on the surface of the direct connection tube 701 to prevent natural gas from entering the gap between the direct connection tube 701 and the shaft sleeve 4. The double-layer sealing cooperation of the second sealing ring 702 and the third sealing ring 703 can effectively ensure the safe exhaust of the gas outlet channel 10 without affecting the sealing performance, thereby extending the service life.

[0030] The main difference between the present embodiment and the prior art is that the present embodiment is designed to use a push-type exhaust mechanism 7 in conjunction with the valve stem 6, specifically, an air outlet channel 10 is designed on the shaft sleeve 4, one end of the air outlet channel 10 is located in the inner cavity 101, and the other end of the air outlet channel 10 is at the same height as the air outlet 401, and the direct connection tube 701 is sleeved on the upper end of the valve stem 6. At the same time, the direct connection tube 701 can rotate and rise and fall in the shaft sleeve 4, and the position of the straight through hole 707 is higher than the air outlet channel 10. When working, the switch mechanism 8 drives the direct connection tube 701 to rotate to drive the valve stem 6 to rotate, thereby realizing the switch function of the ball 2, and when the direct connection tube 701 is close to the air outlet channel A through hole 707 is designed at the gas outlet channel 10. When the ball 2 is in the closed state, the handle 12 is pressed to move the extension rod 705 downward, and the straight-connection tube 701 and the through hole 707 move downward accordingly, so that the through hole 707 is located between the gas outlet channel 10 and the gas outlet 401. At this time, the gas outlet channel 10, the through hole 707 and the gas outlet 401 form a channel, and the residual natural gas in the inner cavity 101 is discharged from the gas outlet channel 10, the through hole 707 to the gas outlet 401, so that part of the residual natural gas in the inner cavity 101 can be discharged. Timely discharge of residual gas can reduce the risk of leakage, protect the internal sealing of the valve seat 1, and ensure the safety of personnel and equipment; The above structure is the main structure of this embodiment, which solves the problem of natural gas remaining inside the inner cavity 101 and affecting the sealing of the valve seat 1. The ball 2 and the shaft sleeve 4 are both existing structures. The specific structure and connection method between the protective shell 11 and the shaft sleeve 4 are not described in detail in this embodiment. In addition, the rotation control switch of the ball 2 also belongs to the existing technology. Therefore, this application does not make detailed limitations.

[0031] Reference Figure 10-11 The switch mechanism 8 includes a worm wheel 801 and a worm 802. The worm wheel 801 is fixedly connected to the circumferential surface of the extension rod 705. The worm 802 is rotatably connected between the inner walls of the protective shell 11. The worm 802 is meshed with the worm wheel 801. One end of the worm 802 passes through the protective shell 11 and is fixedly connected to a handwheel 803.

[0032] In this embodiment, it should be specifically explained that: the worm wheel 801 and the worm 802 are both located in the protective shell 11, and the protective shell 11 slides linearly on the upper side of the shaft sleeve 4. The handwheel 803 is used to control the rotation of the worm 802. The worm 802 drives the worm wheel 801 to slow down the rotation, and then drives the extension rod 705 to rotate. The structure is simple and easy to use, and the self-locking properties of the worm 802 and the worm wheel 801 can be used to prevent accidental opening or closing under certain conditions, thereby improving safety.

[0033] Reference Fig.11The limiting mechanism 9 includes a blocking rod 901 and a follower rod 902. The blocking rod 901 is provided with two and fixedly connected to the lower inner wall of the protective shell 11. The follower rod 902 is fixedly connected to the upper end of the extension rod 705. The moving range of the end of the follower rod 902 is located between the two blocking rods 901.

[0034] In this embodiment, it is necessary to specifically explain that: the limit mechanism 9 is used to limit the movement range of the worm gear 801. When the ball 2 is switched, the follower rod 902 rotates following the extension rod 705. The blocking rod 901 limits the rotation range to 90 degrees to limit the extension rod 705 to rotate by 90 degrees, that is, rotation within the switching range. The ball 2 can accurately switch from a fully open state to a fully closed state, or from a fully closed state to a fully open state, to achieve complete flow or complete cutoff of the fluid, which can ensure that the valve achieves the best sealing effect when it is closed. By accurately controlling the rotation angle of the valve, it can be ensured that the sealing surface of the valve fits tightly with the valve seat to form an effective sealing pair to prevent fluid leakage.

[0035] Reference Figure 5 Each set of sealing mechanisms 3 includes a sealing body 301, a first sealing ring 302 and a first spring 303. The sealing body 301 is embedded in the inner cavity 101, and the first sealing ring 302 is embedded in the circumferential surface of the sealing body 301. A plurality of mounting holes 304 are opened on the side of the sealing body 301 away from the spherical body 2, and a first spring 303 is installed in each mounting hole 304.

[0036] In this embodiment, it is necessary to specifically explain that: the sealing body 301 is used to fit the surface of the ball 2 to play a sealing role, the first sealing ring 302 is made of rubber to enhance the sealing performance, the first spring 303 is evenly distributed around the sealing body 301, and the first spring 303 is in contact with the inner wall of the valve seat 1, and the first spring 303 can apply a certain pre-tightening force to the sealing body 301 to make it fit more closely to the surface of the ball 2, thereby effectively preventing gas leakage, and this tightness can be maintained even when the connecting parts are deformed, vibrated, or thermally expanded and contracted. When the contact surface between the sealing body 301 and the ball 2 is worn due to long-term use, the elastic force of the first spring 303 can push the sealing body 301 to move toward the ball 2, perform a certain degree of automatic compensation, maintain the sealing effect, and extend the service life.

[0037] Reference Figure 9-10 A slider 706 is fixedly connected to the inner wall of the direct connection tube 701 , a slide groove 602 is opened on the circumferential surface of the valve stem 6 , and the slider 706 is slidably connected in the slide groove 602 .

[0038] In this embodiment, it is necessary to specifically explain that: when the direct-connection tube 701 moves up and down, under the limiting action of the slide groove 602, the slider 706 will move in a straight line, thereby limiting the straight-line movement of the direct-connection tube 701. At the same time, when the direct-connection tube 701 rotates, the valve stem 6 will be driven to rotate as a whole under the limiting action of the slide groove 602, thereby driving the ball 2 to rotate to realize the switching function.

[0039] Reference Figure 6 The bottom of the valve seat 1 is fixedly connected with an auxiliary shaft 5 , the upper end of the auxiliary shaft 5 is provided with a concave surface 501 , and the ball 2 is rotatably connected to the upper side of the concave surface 501 .

[0040] In this embodiment, it is necessary to specifically explain that: the auxiliary shaft 5 is installed by the bottom of the valve seat 1, and the concave surface 501 is concavely designed to fit the surface of the ball 2, supporting the ball 2 to rotate more stably. The ball 2 needs to maintain a stable position and posture inside the inner cavity 101 to ensure normal opening and closing. The auxiliary shaft 5 provides better stability and provides the necessary support for the ball 2 to prevent the ball 2 from unnecessary displacement or deformation under the medium pressure or during operation.

[0041] Reference Figure 8-10 Two third sealing rings 703 are provided, one end of the air outlet channel 10 is located in the inner cavity 101, the other end of the air outlet channel 10 is in the same height as the air outlet 401 and is located between the two third sealing rings 703, and the straight hole 707 is lowered to between the air outlet channel 10 and the air outlet 401 to connect the air outlet channel 10 and the air outlet 401.

[0042] In the present embodiment, it is necessary to specifically explain that: the diameters of the gas outlet channel 10, the straight hole 707 and the gas outlet 401 are the same, and the straight hole 707 can rise and fall with the straight-connected tube 701. When the straight hole 707 drops to the lowest position, the gas outlet channel 10, the straight hole 707 and the gas outlet 401 are concentric. At this time, the gas outlet channel 10, the straight hole 707 and the gas outlet 401 are connected, and the gas inside the inner cavity 101 can be discharged from it, thereby solving the problem of residual gas in the inner cavity 101 expanding due to temperature.

[0043] Working principle of the present invention: The main problem solved by this embodiment is: using the air outlet channel 10, the straight hole 707 and the air outlet 401 as channels, and using the liftable design of the straight hole 707, when the air outlet channel 10, the straight hole 707 and the air outlet 401 are concentric, the gas inside the inner cavity 101 can be discharged, so as to solve the problem of the expansion of the residual gas inside the inner cavity 101 due to temperature, ensure the sealing of the overall structure, and extend the service life, and use the elastic support of the first spring 303 to make the sealing body 301 more closely fit the surface of the sphere 2, thereby solving the problem of loss of sealing due to wear of the sealing structure, thereby effectively preventing gas leakage.

[0044] The specific steps are as follows: Rotating the handwheel 803 drives the worm 802 to rotate, which drives the worm wheel 801 to rotate under the meshing action, and the worm wheel 801 drives the extension rod 705 to rotate, which in turn drives the direct connection tube 701 to rotate, and then drives the slide groove 602, the valve stem 6 and the positioning block 601 to rotate as a whole, and finally drives the ball 2 to rotate to follow to realize the switching function of the valve, and utilizes the follower rod 902 to move within the range of the blocking rod 901 to limit the ball 2 to work within the single switching range of 90 degrees.

[0045] When the residual gas needs to be discharged, the sphere 2 needs to be in a closed state, and then the handle 12 is pressed to drive the protective shell 11 to move downward as a whole, and the protective shell 11 drives the direct-connection tube 701 to move downward. The second spring 704 is compressed due to the direct-connection tube 701, and the straight hole 707 moves downward with the direct-connection tube 701, so that the straight hole 707 is located between the air outlet channel 10 and the air outlet 401. At this time, the air outlet channel 10, the straight hole 707 and the air outlet 401 form a channel, and the residual gas in the inner cavity 101 is discharged from this channel. Then the handle 12 is released, and the direct-connection tube 701 is reset under the elastic action of the second spring 704 to complete the exhaust work.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A cryogenic valve for a cryogenic oil well pipeline, comprising a valve seat (1), characterized in that: The valve seat (1) is provided with an inner cavity (101), a ball (2) is rotatably connected in the inner cavity (101), a group of sealing mechanisms (3) are provided on both sides of the ball (2), a shaft sleeve (4) is fixedly connected to the upper side of the valve seat (1), an air outlet (401) is provided on the circumferential surface of the shaft sleeve (4), a valve stem (6) and a push-type exhaust mechanism (7) are provided in the shaft sleeve (4), the valve stem (6) is rotatably connected in the shaft sleeve (4), the valve stem (6) and the ball (2) are detachably connected, an air outlet channel (10) is provided in the valve stem (6), a protective shell (11) is slidably connected to the upper side of the shaft sleeve (4), a switch mechanism (8) and a limit mechanism (9) are provided in the protective shell (11), and a handle (12) is fixedly connected to the side of the protective shell (11); The push-type exhaust mechanism (7) comprises a direct-connection tube (701), a second sealing ring (702), a third sealing ring (703), a second spring (704), an extension rod (705) and a straight-through hole (707); the direct-connection tube (701) is rotatably and slidably connected to the valve stem (6); the second sealing ring (702) is embedded in the circumferential surface of the direct-connection tube (701); the bottom of the direct-connection tube (701) is sleeved on the upper end of the valve stem (6); the third sealing ring (703) is embedded in the inner wall of the direct-connection tube (701); the second spring (704) is sleeved on the circumferential surface of the valve stem (6) and is located at the lower side of the direct-connection tube (701); and the circumferential surface of the direct-connection tube (701) is provided with a straight-through hole (707).

2. A cryogenic valve for cryogenic oil well pipeline according to claim 1, characterized in that: The switch mechanism (8) comprises a worm wheel (801) and a worm (802); the worm wheel (801) is fixedly connected to the circumferential surface of the extension rod (705); the worm (802) is rotatably connected between the inner walls of the protective shell (11); the worm (802) is meshed with the worm wheel (801); one end of the worm (802) passes through the protective shell (11) and is fixedly connected to a hand wheel (803).

3. A cryogenic valve for a cryogenic oil well pipeline according to claim 1, characterized in that: The limiting mechanism (9) comprises a blocking rod (901) and a follower rod (902); two blocking rods (901) are provided and fixedly connected to the lower inner wall of the protective shell (11); the follower rod (902) is fixedly connected to the upper end of the extension rod (705); and the moving range of the end of the follower rod (902) is located between the two blocking rods (901).

4. A cryogenic valve for a cryogenic oil well pipeline according to claim 1, characterized in that: Each set of the sealing mechanisms (3) comprises a sealing body (301), a first sealing ring (302) and a first spring (303); the sealing body (301) is embedded in the inner cavity (101); the first sealing ring (302) is embedded in the circumferential surface of the sealing body (301); a plurality of mounting holes (304) are provided on a side of the sealing body (301) away from the spherical body (2); and a first spring (303) is installed in each mounting hole (304).

5. The cryogenic valve for cryogenic oil well pipeline according to claim 1, characterized in that: A sliding block (706) is fixedly connected to the inner wall of the direct connection tube (701), a sliding groove (602) is provided on the circumferential surface of the valve stem (6), and the sliding block (706) is slidably connected in the sliding groove (602).

6. A cryogenic valve for cryogenic oil well pipeline according to claim 1, characterized in that: A slot (201) is provided on the upper side of the sphere (2), and a positioning block (601) is provided on the bottom of the valve stem (6), wherein the positioning block (601) is inserted into the slot (201) from top to bottom.

7. A cryogenic valve for cryogenic oil well pipeline according to claim 1, characterized in that: The bottom of the valve seat (1) is fixedly connected to an auxiliary shaft (5), the upper end of the auxiliary shaft (5) is provided with a concave surface (501), and the ball (2) is rotatably connected to the upper side of the concave surface (501).

8. The cryogenic valve for cryogenic oil well pipeline according to claim 1, characterized in that: Two third sealing rings (703) are provided, one end of the air outlet channel (10) is located in the inner cavity (101), the other end of the air outlet channel (10) is at the same height as the air outlet (401) and is located between the two third sealing rings (703), and the straight through hole (707) is lowered to between the air outlet channel (10) and the air outlet (401) so that the air outlet channel (10) and the air outlet (401) are connected.

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