Low temperature double disc check valve

Abstract

The application belongs to the technical field of check valves, and particularly relates to a low-temperature double-valve-piston check valve, which comprises a valve body, a positioning rod rotatably connected in the valve body, and a ring-shaped valve seat fixedly connected with the positioning rod. The positioning rod is fixedly connected with a left valve piston through an upper rotating cylinder and rotatably connected with a right valve piston through a lower rotating cylinder. A spring one is arranged between the positioning rod and the upper rotating cylinder, and a spring two is arranged between the positioning rod and the lower rotating cylinder. A steering assembly is arranged at the upper end of the positioning rod. Through the steering assembly, the positioning rod is driven to rotate by 180 degrees, and the ring-shaped valve seat, the left valve piston and the right valve piston in the valve body are all driven to rotate by 180 degrees, so as to change the check direction of the valve body and adapt to the pipeline temporarily changing the fluid guiding direction. The whole check valve does not need to be removed, and only needs to be driven to rotate by 180 degrees through the steering assembly, so that the operation is convenient and fast.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of check valves, and particularly relates to a low-temperature double-valve-petal check valve. BACKGROUND

[0002] The existing double-petal check valve needs to be disassembled, turned over, and reinstalled in the pipeline when the check direction needs to be changed, which is troublesome and time-consuming.

[0003] For example, a double-petal check valve with patent application number CN200910031715.2 includes a valve body, valve petals, a valve seat, a sealing ring, torsional springs, a valve shaft, a small shaft, the sealing ring is directly vulcanized on the valve seat, two symmetrical semicircular valve petals are installed in the valve body through the valve shaft, two torsional springs are also installed on the valve shaft, one end of the torsional spring is in close contact with the back of the valve petal, the other end is buckled on the small shaft, two rectangular limit blocks are respectively installed on two sides of the valve body, the limit blocks have two holes, the valve shaft and the small shaft are respectively installed in the holes of the limit blocks, and a retaining ring is also installed on the outside of the limit block and is connected with the valve body by spot welding. However, the technical scheme has the disadvantage that the valve body needs to be disassembled, turned over, and reinstalled in the pipeline when the check direction needs to be changed, which is troublesome and time-consuming. SUMMARY

[0004] The application aims to provide a low-temperature double-valve-petal check valve to solve the problems in the prior art, and the specific technical scheme is as follows:

[0005] The low-temperature double-valve-petal check valve includes a valve body, a positioning rod rotatably connected in the valve body, an annular valve seat fixedly connected with the positioning rod, a left valve petal fixedly connected with the positioning rod through an upper rotating cylinder, a right valve petal rotatably connected with the positioning rod through a lower rotating cylinder, a spring one arranged between the positioning rod and the upper rotating cylinder, a spring two arranged between the positioning rod and the lower rotating cylinder, and a steering assembly arranged on the upper end of the positioning rod.

[0006] Further, the steering assembly includes a limiting column fixedly connected with the upper end of the positioning rod, a cross slide connected with the limiting column, a support pipe fixedly connected with the valve body, a spring three arranged between the inner wall of the support pipe and the cross slide, a connecting shaft fixedly connected with a rotating rod, two limiting grooves one and one limiting groove two arranged on the top of the support pipe, and the tail of the rotating rod is clamped in the limiting groove one or the limiting groove two.

[0007] Further, a sealing ring one is arranged at the contact position between the annular valve seat and the inner wall of the valve body, and a packing one is arranged at the rotatable connection position between the positioning rod and the valve body.

[0008] Further, the valve body is provided with airtight sealing assemblies at both ends, the airtight sealing assemblies comprise fixed pipes fixed at the end of the valve body, the fixed pipes are fixedly connected with the rotating shaft through connecting rods, the lower fixed frame and the upper fixed frame are rotatably connected with the rotating shaft, the other end of the lower fixed frame is rotatably connected with the lower end of the locking screw, and the upper end of the locking screw is clamped on the other end of the upper fixed frame through a nut.

[0009] Further, the upper fixed frame is slidably connected with three sliding blocks, the lower end of the three sliding blocks is fixed on the side plate, a fixed screw is inserted in the sliding block, one end of the fixed screw is abutted on the sliding block, and the other end of the fixed screw is abutted on the support seat through a nut, and the support seat is fixed on the upper fixed frame.

[0010] Further, the fixed pipe is butted with one end of the connecting pipe, the side plate is abutted on one outer wall of the connecting pipe, and the inner wall of the upper fixed frame is slidably connected with one outer wall of the connecting pipe.

[0011] Further, a long groove is arranged at the butting position of the fixed pipe and the connecting pipe, an airtight sealing ring is arranged in the long groove, the airtight sealing ring is communicated with the air cylinder through the connecting pipe two, the air cylinder is fixed on the fixed pipe, a piston is slidably connected in the air cylinder, the tail of the piston is slidably arranged in the rotating wheel, and the rotating wheel is threadedly connected with the fixed pipe.

[0012] Further, two detection assemblies are fixed at the bottom of the valve body, the two detection assemblies are consistent in structure and are located at the two sides of the positioning rod, the detection assembly comprises a lower shell fixed at the bottom of the valve body, the lower shell is communicated with the valve body through a slot, a threaded plate is fixed at the lower end of the lower shell, the threaded plate is threadedly connected with the gland, the gland extrudes the bottom plate on the bottom of the lower shell, a second sealing ring is arranged between the bottom plate and the lower shell, a flow rate detector is fixed on the bottom plate, a second packing is arranged at the connecting position of the bottom plate and the flow rate detector, and the flow rate detector is slidably connected with the gland.

[0013] Further, a support assembly is fixed at the bottom of the detection assembly, the support assembly comprises an upper rod fixed at the bottom of the bottom plate, the upper rod is rotatably connected with a lower rod, the upper rod and the lower rod are slidably connected with a limiting pipe, a fourth spring is arranged between the limiting pipe and the bottom plate, the lower rod is slidably connected with an outer rod, the outer rod is slidably connected with a pressing rod, the front end of the pressing rod is inserted into a tooth groove arranged in the lower rod, a fifth spring is arranged between the pressing rod and the inner wall of the outer rod, and the pressing rod is rotatably connected with a pull rod.

[0014] Further, the outer rod is rotatably connected with the upper end of the adapter, the lower end of the adapter is rotatably connected with the second adapter, the second adapter is rotatably connected with the third adapter, the third adapter is inserted into the bandage, the third adapter is fixedly connected with the bandage through two fixed nuts, the two ends of the bandage are fixed through screw assemblies, the lower end of the outer rod is provided with four grooves in different directions, the side edges of the grooves are provided with protrusions, the second adapter is clamped in the groove, and the protrusions are abutted on the lower end of the second adapter.

[0015] The advantages of the present application are that:

[0016] 1. By using the steering assembly, the positioning rod is rotated 180 degrees, which in turn rotates the annular valve seat, left valve disc, and right valve disc in the valve body by 180 degrees, thereby changing the check direction of the valve body. This adapts to pipelines that temporarily change the direction of fluid flow. There is no need to remove the entire check valve; simply use the steering assembly to rotate the positioning rod 180 degrees. The operation is convenient and quick.

[0017] 2. By using the steering assembly, the positioning rod is rotated 90 degrees, which in turn rotates the annular valve seat, left valve disc, and right valve disc in the valve body by 90 degrees. At this time, the left and right valve discs are set parallel to the fluid flow direction. The left and right valve discs do not play the role of conduction or check. The valve body serves as a normal connecting pipe, adapting to different usage conditions. Attached Figure Description

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

[0019] Figure 2 This is a schematic diagram of the overall structure of the present invention. Figure 2 ;

[0020] Figure 3 This is a schematic diagram of the steering component structure of the present invention. Figure 1 ;

[0021] Figure 4 This is a schematic diagram of the steering component structure of the present invention. Figure 2 ;

[0022] Figure 5 This is a schematic diagram of the steering component structure of the present invention. Figure 3 ;

[0023] Figure 6 for Figure 5 Enlarged view of a portion of point A in the middle;

[0024] Figure 7 This is a schematic diagram of the steering component structure of the present invention. Figure 4 ;

[0025] Figure 8 This is a schematic diagram of the gas-tight assembly structure of the present invention. Figure 1 ;

[0026] Figure 9 This is a schematic diagram of the gas-tight assembly structure of the present invention. Figure 2 ;

[0027] Figure 10 This is a schematic diagram of the gas-tight assembly structure of the present invention. Figure 3 ;

[0028] Figure 11 for Figure 10 Enlarged view of a section at point B in the middle;

[0029] Figure 12 Structure diagram of detection assembly of the present application Figure 1 ;

[0030] Figure 13 For Figure 12 local enlarged view at C in the middle;

[0031] Figure 14 Structure diagram of detection assembly of the present application Figure 2 ;

[0032] Figure 15 Structure diagram of detection assembly of the present application Figure 3 ;

[0033] Figure 16 For Figure 15 local enlarged view at D in the middle;

[0034] Figure 17 For Figure 15 local enlarged view at E in the middle;

[0035] Figure 18 For Figure 15 local enlarged view at F in the middle;

[0036] Marked description in the figure:

[0037] Valve body 1; support pipe 2; annular valve seat 3; left valve clack 4; right valve clack 5; positioning rod 6; spring one 7; upper rotating cylinder 8; spring two 9; lower rotating cylinder 10; sealing ring one 11; packing one 12; cross 13; spring three 14; limiting column 15; rotating rod 16; limiting groove one 17; limiting groove two 18; connecting shaft 19; slot 20; fixed pipe 21; connecting pipe one 22; connecting rod 23; lower fixed frame 24; upper fixed frame 25; locking screw 26; sliding block 27; side plate 28; fixed screw 29; support seat 30; long groove 31; air sealing ring 32; connecting pipe two 33; air cylinder 34; piston 35; rotating wheel 36; lower shell 37; flow rate detector 38; packing two 39; bottom plate 40; sealing ring two 41; threaded plate 42; gland 43; upper rod 44; lower rod 45; spring four 46; limiting pipe 47; tooth groove 48; pressing rod 49; spring five 50; pull rod 51; outer rod 52; adapter one 53; adapter two 54; adapter three 55; bandage 56; fixed nut 57; screw three 58; protrusion 59; recess 60. DETAILED DESCRIPTION

[0038] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. 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.

[0039] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0040] Example 1

[0041] like Figures 1-18 As shown, a low-temperature double-valve check valve includes a valve body 1, a positioning rod 6 rotatably connected inside the valve body 1, the positioning rod 6 being fixedly connected to an annular valve seat 3, the positioning rod 6 being fixedly connected to the left valve disc 4 via an upper rotating cylinder 8, the positioning rod 6 being rotatably connected to the right valve disc 5 via a lower rotating cylinder 10, a spring 7 being provided between the positioning rod 6 and the upper rotating cylinder 8, a spring 9 being provided between the positioning rod 6 and the lower rotating cylinder 10, and a steering assembly being provided at the upper end of the positioning rod 6.

[0042] The working principle of the above technical solution is as follows: Fluid enters the valve body 1 from the left side. The fluid pressure is applied to the left valve disc 4 and the right valve disc 5. The fluid squeezes the left valve disc 4 to rotate on the positioning rod 6 with the upper rotating cylinder 8 as the axis, causing the spring 7 to deform. The fluid squeezes the right valve disc 5 to rotate on the positioning rod 6 with the lower rotating cylinder 10 as the axis. Both the left valve disc 4 and the right valve disc 5 are separated from the annular valve seat 3, which facilitates the passage of fluid and allows it to pass through the right side of the valve body 1. When the fluid in the valve body 1 wants to pass from right to left, the edges of the left valve disc 4 and the right valve disc 5 are pressed against the annular valve seat 3, making it impossible for the left valve disc 4 and the right valve disc 5 to rotate and open. As a result, the fluid can only flow from left to right and cannot flow from right to left, thus achieving the effect of preventing backflow.

[0043] By using the steering assembly, the positioning rod 6 is rotated 180 degrees, which in turn rotates the annular valve seat 3, left valve disc 4, and right valve disc 5 inside the valve body 1 by 180 degrees. This changes the check valve direction, preventing fluid from flowing from left to right within the valve body 1 and allowing it to flow only from right to left. This adapts to situations where the fluid direction needs to be temporarily changed. There is no need to remove the entire check valve; simply rotating the positioning rod 6 180 degrees via the steering assembly is sufficient, making the operation convenient and quick.

[0044] The steering assembly drives the positioning rod 6 to rotate 90 degrees, which in turn drives the annular valve seat 3, left valve disc 4, and right valve disc 5 inside the valve body 1 to rotate 90 degrees. At this time, the left valve disc 4 and right valve disc 5 are set parallel to the fluid flow direction. The left valve disc 4 and right valve disc 5 do not play the role of conduction or check. The valve body 1 serves as a normal connecting pipe and is suitable for different usage conditions.

[0045] Example 2

[0046] like Figures 1-18 As shown, the steering assembly includes a limiting post 15, which is fixed to the upper end of the positioning rod 6. The limiting post 15 is slidably connected to the cross 13, which slides inside the support tube 2. The support tube 2 is fixed to the valve body 1. A spring 3 14 is provided between the inner wall of the support tube 2 and the cross 13. The cross 13 is fixedly connected to the rotating rod 16 through the connecting shaft 19. The top of the support tube 2 is provided with two limiting grooves 17 and one limiting groove 2 18. The tail of the rotating rod 16 is engaged in the limiting groove 17 or the limiting groove 2 18.

[0047] The working principle of the above technical solution is as follows: the direction pointed to by the tail of the rotating rod 16 is the direction of fluid flow in the check valve, and the opposite direction is the direction of fluid check. When it is necessary to change the direction of fluid check, the rotating rod 16 is pulled upward, which drives the cross 13 to move upward through the connecting shaft 19, thereby compressing the spring 14. When the tail of the rotating rod 16 disengages from the limiting groove 17, the rotating rod 16 is rotated 180 degrees, which drives the cross 13 to rotate 180 degrees through the connecting shaft 19, thereby driving the limiting post 15 to rotate 180 degrees. The position rod 6 rotates 180 degrees, causing the annular valve seat 3, left valve disc 4, right valve disc 5, spring 1 7, upper rotating cylinder 8, spring 2 9, and lower rotating cylinder 10 to rotate 180 degrees along with the position rod 6. After the rotating rod 16 rotates 180 degrees, the opening restricts the rotating rod 16. Under the elastic force of spring 3 14, the cross 13 moves down, and the rotating rod 16 moves down through the connecting shaft 19. The tail of the rotating rod 16 is engaged in another limiting groove 17, thereby changing the direction of fluid check.

[0048] If the positioning rod 6 is rotated 90 degrees, the annular valve seat 3, left valve disc 4, right valve disc 5, spring 1 7, upper rotating cylinder 8, spring 2 9, and lower rotating cylinder 10 will rotate 90 degrees along with the positioning rod 6. The tail of the positioning rod 6 will then engage with the limiting groove 2 18. At this time, the left valve disc 4 and right valve disc 5 are both set parallel to the fluid direction. The left valve disc 4 and right valve disc 5 do not have the function of conduction or check. The valve body 1 serves as a normal connection pipe. Furthermore, by rotating the rotating rod 16, the check valve's check direction and function can be changed to adapt to different usage conditions.

[0049] Example 3

[0050] like Figures 1-18As shown, a sealing ring 11 is provided at the contact point between the annular valve seat 3 and the inner wall of the valve body 1, and a packing 12 is provided at the rotatable connection point between the positioning rod 6 and the valve body 1.

[0051] The working principle of the above technical solution is as follows: the sealing ring 11 increases the sealing performance at the connection between the annular valve seat 3 and the valve body 1, and the packing 12 increases the sealing performance at the rotatable connection between the positioning rod 6 and the valve body 1.

[0052] Example 4

[0053] like Figures 1-18 As shown, both ends of the valve body 1 are provided with air-sealing assemblies. The air-sealing assembly includes a fixing tube 21, which is fixed to the end of the valve body 1. The fixing tube 21 is fixedly connected to the rotating shaft through the connecting rod 23. One end of the lower fixing frame 24 and the upper fixing frame 25 are rotatably connected to the rotating shaft. The other end of the lower fixing frame 24 is rotatably connected to the lower end of the locking screw 26. The upper end of the locking screw 26 is clamped to the other end of the upper fixing frame 25 by a nut.

[0054] Three sliders 27 are slidably connected to the upper fixed frame 25. The lower ends of the three sliders 27 are all fixed to the side plate 28. A fixing screw 29 is inserted into the slider 27. One end of the fixing screw 29 abuts against the slider 27, and the other end of the fixing screw 29 abuts against the support seat 30 through a nut. The support seat 30 is fixed to the upper fixed frame 25.

[0055] The fixed tube 21 is connected to the end of the connecting tube 22, the side plate 28 abuts against the outer wall of the connecting tube 22, and the inner wall of the upper fixed frame 25 is slidably connected to the outer wall of the connecting tube 22.

[0056] The fixed pipe 21 and the connecting pipe 22 are provided with a long groove 31. An air seal ring 32 is provided in the long groove 31. The air seal ring 32 is connected to the air cylinder 34 through the connecting pipe 33. The air cylinder 34 is fixed on the fixed pipe 21. A piston 35 is slidably connected in the air cylinder 34. The tail of the piston 35 slides in the rotating wheel 36. The rotating wheel 36 is threadedly connected to the fixed pipe 21.

[0057] The working principle of the above technical solution is as follows: Remove the nut on the locking screw 26, take the upper end of the locking screw 26 out from the end of the upper fixing frame 25, rotate the upper fixing frame 25 upward with the rotating shaft as the axis, so that the upper fixing frame 25 is separated from the fixing tube 21, rotate the lower fixing frame 24 downward with the rotating shaft as the axis, so that the lower fixing frame 24 is separated from the fixing tube 21, and connect the connecting tube 22 to the fixing tube 21.

[0058] Again turn the lower fixed frame 24 and the upper fixed frame 25, the lower fixed frame 24 and the upper fixed frame 25 are aggregated, the upper fixed frame 25 and the lower fixed frame 24 are consistent in structure, the fixed pipe 21 and the connecting pipe one 22 end are clamped, the side plate 28 is resisted on the connecting pipe one 22 outer wall, the inner wall of the upper fixed frame 25 and the lower fixed frame 24 are all resisted on the connecting pipe one 22 outer wall, the lower end of the locking screw 26 is rotationally connected with the lower fixed frame 24, the upper end of the locking screw 26 is inserted into the upper fixed frame 25 slot, and is fixed through the nut, with the continuous locking of the nut, the end of the upper fixed frame 25 and the lower fixed frame 24 is continuously close to each other, the upper fixed frame 25 and the fixed pipe 21 slide, the lower fixed frame 24 and the fixed pipe 21 slide, and the fixed pipe 21 and the connecting pipe one 22 contact end are clamped;

[0059] Turn the rotating wheel 36, drive the rotating wheel 36 to rotate with the fixed pipe 21, drive the rotating wheel 36 to move on the fixed pipe 21 to the upper fixed frame 25 direction, the rotating wheel 36 extrudes the piston 35 to move forward, the piston 35 moves forward in the air cylinder 34, the gas in the air cylinder 34 is extruded into the gas seal ring 32 through the connecting pipe two 33, the gas seal ring 32 is inflated and expanded, and the expanded gas seal ring 32 is extruded between the fixed pipe 21 and the connecting pipe one 22, thereby increasing the sealing property of the connecting place of the fixed pipe 21 and the connecting pipe one 22;

[0060] Because there is a certain gap between the upper end of the connecting pipe one 22 and the inner wall of the upper fixed frame 25, and there is a certain gap between the lower end of the connecting pipe one 22 and the lower fixed frame 24, when the valve body 1 is vibrated, the fixed pipe 21 and the connecting pipe one 22 slide a certain distance, and the gas seal ring 32 deforms a certain distance, so that the valve body 1 has a certain shock absorption effect, and the gas seal ring 32 is filled with gas inside, and the two sides are tightly attached to the fixed pipe 21 and the connecting pipe one 22 in the deformation condition, without affecting the sealing property;

[0061] Loosen the nut at the end of the fixed screw 29, slide the sliding block 27 on the upper fixed frame 25, drive the side plate 28 to move with the sliding block 27, thereby changing the distance between the side plate 28 and the other end of the upper fixed frame 25, and thereby adapting to different thickness models of the connecting pipe one 22, with strong adaptability.

[0062] Example five

[0063] As Figures 1-18As shown, the valve body 1 bottom is fixed with two detection assemblies, two detection assemblies are consistent in structure, and are respectively located on both sides of the positioning rod 6, the detection assembly includes a lower shell 37, the lower shell 37 is fixed on the bottom of the valve body 1, the lower shell 37 is communicated with the valve body 1 through the notch 20, the lower end of the lower shell 37 is fixed with a threaded plate 42, the threaded plate 42 is screwed with a gland 43, the gland 43 extrudes the bottom plate 40 on the bottom of the lower shell 37, a sealing ring two 41 is arranged between the bottom plate 40 and the lower shell 37, the bottom plate 40 is fixed with a flow rate detector 38, a packing two 39 is arranged at the connection between the bottom plate 40 and the flow rate detector 38, the flow rate detector 38 is slidably connected with the gland 43;

[0064] The bottom of the detection assembly is fixed with a support assembly, the support assembly includes an upper rod 44, the upper rod 44 is fixed on the bottom of the bottom plate 40, the upper rod 44 is rotatably connected with a lower rod 45, the upper rod 44 and the lower rod 45 are slidably connected with a limiting tube 47, a spring four 46 is arranged between the limiting tube 47 and the bottom plate 40, the lower rod 45 is slidably connected with an outer rod 52, the outer rod 52 is slidably connected with a pressing rod 49, the front end of the pressing rod 49 is inserted into the tooth groove 48 arranged in the lower rod 45, a spring five 50 is arranged between the pressing rod 49 and the inner wall of the outer rod 52, the pressing rod 49 is rotatably connected with a pull rod 51;

[0065] The outer rod 52 is rotatably connected with the adapter one 53, the lower end of the adapter one 53 is rotatably connected with the adapter two 54, the adapter two 54 is rotatably connected with the adapter three 55, the adapter three 55 is inserted into the band 56, the adapter three 55 is fixedly connected with the band 56 through two fixing nuts 57, the two ends of the band 56 are fixed through the screw rod assembly 58, the lower end of the outer rod 52 is provided with four grooves 60 in different directions, the side edge of the groove 60 is provided with a protrusion 59, the adapter two 54 is clamped in the groove 60, and the protrusion 59 abuts against the lower end of the adapter two 54;

[0066] The working principle of the above technical scheme is that the flow rate detectors 38 are arranged on both sides of the positioning rod 6, the two flow rate detectors 38 detect the flow rates of the fluids on both sides of the positioning rod 6 respectively, and whether the opening and closing actions of the left valve disc 4 and the right valve disc 5 are normal can be judged according to the flow rates of the fluids on both sides;

[0067] After the check valve is used for a long time, impurities may exist between the annular valve seat 3 and the left valve disc 4 or between the annular valve seat 3 and the right valve disc 5, which affect the opening and closing of the left valve disc 4 and the right valve disc 5 and affect the effect of the check;

[0068] The slot 20 is long slot shape, compared with the traditional circular cleaning hole, the long slot shape cleaning hole is larger, more convenient for tools to enter, the filler 39 can increase the sealing between the bottom plate 40 and the flow rate detector 38;

[0069] The upper rod 44, the lower rod 45 and the outer rod 52 form a support rod group, the lower end of the support rod group can be placed on the ground or the building, supporting the valve body 1, preventing the check valve from being too heavy, increasing the burden of the two ends of the connecting support rod, the band 56 is made of stainless steel, the lower end of the band 56 is flush with the lower end of the outer rod 52, increasing the support area of the support rod group and increasing the support stability;

[0070] Pulling the pull rod 51 drives the compression rod 49 to move outward, compressing the spring 50, and separating the lower end of the compression rod 49 from the tooth groove 48, at this time the lower rod 45 and the outer rod 52 can slide, thereby changing the length of the overall support rod group, thereby adapting to different heights of support, after the adjustment is completed, the pull rod 51 is released, under the action of the spring 50, the front end of the compression rod 49 is clamped into the tooth groove 48, preventing the lower rod 45 and the outer rod 52 from sliding automatically, the pull rod 51 is bent downward, saving space;

[0071] In addition to increasing the support area, the band 56 can be tied to other pipelines, and the weight of the check valve can be shared through other pipelines, the band 56 can be fixed to other pipelines at different angles through the rotation of the adapter three 55 and the adapter two 54, pressing the band 56 downward drives the adapter two 54 to separate from the groove 60, the adapter two 54 and the adapter one 53 rotate, the band 56 rotates, the adapter two 54 and the adapter one 53 rotate, the adapter two 54 can be clamped in the groove 60 in other directions, thereby changing the position and direction of the band 56, and the band 56 can be fixed to other pipelines at multiple angles and positions without losing support force, the protrusion 59 limits the adapter two 54;

[0072] The support assembly can be folded and stored to reduce the space occupied, the specific storage method is: pulling the pull rod 51 drives the compression rod 49 to move outward, compressing the spring 50, and separating the front end of the compression rod 49 from the tooth groove 48, sliding the outer rod 52 to the uppermost end to shorten the length of the overall support rod group;

[0073] Pressing the band 56 downward makes the band 56 in a vertical state;

[0074] Sliding the limiting tube 47 drives the spring 46 to be compressed, separating the limiting tube 47 from the lower rod 45, rotating the lower rod 45 by ninety degrees, making the outer rod 52 and the band 56 follow the lower rod 45 to rotate by ninety degrees, making the lower rod 45, the outer rod 52 and the band 56 remain in a horizontal state, thereby completing the folding and storage of the support assembly, reducing the space occupied.

[0075] It is understood that the present invention has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the invention. Furthermore, under the teachings of the present invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of the present invention.

Claims

1. A cryogenic double-disc check valve, characterized in that, The valve includes a valve body (1), a positioning rod (6) is rotatably connected inside the valve body (1), the positioning rod (6) is fixedly connected to the annular valve seat (3), the positioning rod (6) is fixedly connected to the left valve disc (4) through the upper rotating cylinder (8), the positioning rod (6) is rotatably connected to the right valve disc (5) through the lower rotating cylinder (10), a spring 1 (7) is provided between the positioning rod (6) and the upper rotating cylinder (8), a spring 2 (9) is provided between the positioning rod (6) and the lower rotating cylinder (10), and a steering assembly is provided at the upper end of the positioning rod (6). The steering assembly includes a limiting post (15), which is fixed to the upper end of the positioning rod (6). The limiting post (15) is slidably connected to the cross (13). The cross (13) slides inside the support tube (2). The support tube (2) is fixed to the valve body (1). A spring three (14) is provided between the inner wall of the support tube (2) and the cross (13). The cross (13) is fixedly connected to the rotating rod (16) through the connecting shaft (19). The top of the support tube (2) is provided with two limiting grooves one (17) and one limiting groove two (18). The tail of the rotating rod (16) is engaged in the limiting groove one (17) or the limiting groove two (18). Both ends of the valve body (1) are provided with air-sealing components. The air-sealing components include a fixing tube (21), which is fixed at the end of the valve body (1). The fixing tube (21) is fixedly connected to the rotating shaft through a connecting rod (23). One end of the lower fixing frame (24) and the upper fixing frame (25) are rotatably connected to the rotating shaft. The other end of the lower fixing frame (24) is rotatably connected to the lower end of the locking screw (26). The upper end of the locking screw (26) is clamped to the other end of the upper fixing frame (25) by a nut. Three sliders (27) are slidably connected to the upper fixed frame (25). The lower ends of the three sliders (27) are all fixed to the side plate (28). A fixing screw (29) is inserted into the slider (27). One end of the fixing screw (29) abuts against the slider (27), and the other end of the fixing screw (29) abuts against the support seat (30) through a nut. The support seat (30) is fixed to the upper fixed frame (25). The fixed tube (21) is connected to the end of the connecting tube (22), the side plate (28) abuts against the outer wall of the connecting tube (22), and the inner wall of the upper fixed frame (25) is slidably connected to the outer wall of the connecting tube (22). The fixed pipe (21) and the connecting pipe (22) are connected by a long groove (31). An air seal ring (32) is provided in the long groove (31). The air seal ring (32) is connected to the air cylinder (34) through the connecting pipe (33). The air cylinder (34) is fixed on the fixed pipe (21). A piston (35) is slidably connected in the air cylinder (34). The tail of the piston (35) slides in the rotating wheel (36). The rotating wheel (36) is threadedly connected to the fixed pipe (21).

2. The cryogenic double-disc check valve according to claim 1, characterized in that, A sealing ring (11) is provided at the contact point between the annular valve seat (3) and the inner wall of the valve body (1), and a packing (12) is provided at the rotatable connection point between the positioning rod (6) and the valve body (1).

3. A cryogenic double-disc check valve according to claim 1, characterized in that, Two detection components are fixed at the bottom of the valve body (1). The two detection components have the same structure and are located on both sides of the positioning rod (6). The detection components include a lower shell (37). The lower shell (37) is fixed at the bottom of the valve body (1). The lower shell (37) is connected to the inside of the valve body (1) through a slot (20). A threaded plate (42) is fixed at the lower end of the lower shell (37). The threaded plate (42) is threadedly connected to the pressure cap (43). The pressure cap (43) presses the bottom plate (40) against the bottom of the lower shell (37). A sealing ring II (41) is provided between the bottom plate (40) and the lower shell (37). A flow rate detector (38) is fixed on the bottom plate (40). A packing II (39) is provided at the connection between the bottom plate (40) and the flow rate detector (38). The flow rate detector (38) is slidably connected to the pressure cap (43).

4. A cryogenic double-disc check valve according to claim 3, characterized in that, The detection assembly is fixed with a support assembly at the bottom. The support assembly includes an upper rod (44), which is fixed to the bottom of the base plate (40). The upper rod (44) is rotatably connected to the lower rod (45). Both the upper rod (44) and the lower rod (45) are slidably connected to the limiting tube (47). A spring four (46) is provided between the limiting tube (47) and the base plate (40). The lower rod (45) is slidably connected to the outer rod (52). A pressure rod (49) is slidably connected inside the outer rod (52). The front end of the pressure rod (49) is inserted into the toothed groove (48) provided inside the lower rod (45). A spring five (50) is provided between the pressure rod (49) and the inner wall of the outer rod (52). The pressure rod (49) is rotatably connected to the pull rod (51).

5. A cryogenic double-disc check valve according to claim 4, characterized in that, The outer rod (52) is rotatably connected to the upper end of adapter one (53), the lower end of adapter one (53) is rotatably connected to adapter two (54), adapter two (54) is rotatably connected to adapter three (55), adapter three (55) is inserted into the strap (56), adapter three (55) is fixedly connected to the strap (56) by two fixing nuts (57), the two ends of the strap (56) are fixed by screw assembly (58), the lower end of the outer rod (52) is provided with four grooves (60) in different directions, the side edge of the groove (60) is provided with a protrusion (59), adapter two (54) is snapped into the groove (60), and the protrusion (59) abuts against the lower end of adapter two (54).

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