Low-temperature double-valve-clack check valve

Abstract

The invention belongs to the technical field of check valves, and particularly relates to a low-temperature double-valve-clack check valve which comprises a valve body, a positioning rod is rotationally connected into the valve body, fixedly connected with an annular valve seat, fixedly connected with a left valve clack through an upper rotating cylinder and rotationally connected with a right valve clack through a lower rotating cylinder, and a first spring is arranged between the positioning rod and the upper rotating cylinder; a second spring is arranged between the positioning rod and the lower rotating cylinder, a steering assembly is arranged at the upper end of the positioning rod, the positioning rod is driven to rotate by 180 degrees through the steering assembly, an annular valve seat, a left valve clack and a right valve clack in the valve body are driven to rotate by 180 degrees, then the check direction of the valve body is changed, the check valve adapts to a pipeline for temporarily changing the fluid guiding direction, and the whole check valve does not need to be dismantled. The positioning rod can be driven to rotate by 180 degrees through the steering assembly, and operation is convenient and fast.

Description

Technical Field

[0001] The invention belongs to the technical field of check valves, and in particular relates to a low-temperature double-valve-flap check valve. Background Art

[0002] When the check direction of the existing double-flap check valve needs to be changed, the valve body needs to be disassembled, the valve body needs to be turned around and reinstalled in the pipeline, which is troublesome, time-consuming and labor-intensive to disassemble and install.

[0003] For example, the patent application number CN200910031715.2 is a double-flap check valve, which includes a valve body, a valve disc, a valve seat, a sealing ring, a torsion spring, a valve shaft, and a small shaft. The sealing ring is directly vulcanized on the valve seat, and two symmetrical semicircular valve discs are installed in the valve body through the valve shaft. Two torsion springs are also installed on the valve shaft, one end of the torsion spring is close to the back of the valve disc, and the other end is buckled on the small shaft. There are also two rectangular limit blocks respectively installed on the two sides of the valve body, with an upper and lower hole on the limit block. The valve shaft and the small shaft are respectively installed in the holes of the limit block. A retaining ring is also installed on the outside of the limit block, and the retaining ring is connected to the valve body by spot welding. However, the disadvantage of this technical solution is that when the check direction needs to be changed, the valve body needs to be disassembled, the valve body needs to be turned around and reinstalled in the pipeline. Disassembly and installation are both troublesome, time-consuming and labor-intensive. Summary of the invention

[0004] The purpose of the present invention is to provide a low temperature double disc check valve to solve the problems in the prior art. The specific technical solution is as follows:

[0005] A low-temperature double-valve disc check valve comprises a valve body, a positioning rod is rotatably connected in the valve body, the positioning rod is fixedly connected to an annular valve seat, the positioning rod is fixedly connected to a left valve disc via an upper rotating cylinder, the positioning rod is rotatably connected to a right valve disc via a lower rotating cylinder, a spring 1 is provided between the positioning rod and the upper rotating cylinder, a spring 2 is provided between the positioning rod and the lower rotating cylinder, and a steering assembly is provided at the upper end of the positioning rod.

[0006] Furthermore, the steering assembly includes a limit column, which is fixed at the upper end of the positioning rod. The limit column is slidably connected to the cross, the cross slides in the support tube, the support tube is fixed on the valve body, a spring three is provided between the inner wall of the support tube and the cross, the cross is fixedly connected to the rotating rod through a connecting shaft, two limit grooves one and one limit groove two are provided on the top of the support tube, and the tail of the rotating rod is clamped in the limit groove one or the limit groove two.

[0007] Furthermore, a sealing ring is provided at the contact point between the annular valve seat and the inner wall of the valve body, and a packing is provided at the rotation connection point between the positioning rod and the valve body.

[0008] Furthermore, both ends of the valve body are provided with an air sealing assembly, which includes a fixed tube, which is fixed to the end of the valve body, and the fixed tube is fixedly connected to the rotating shaft through a connecting rod. One end of the lower fixed frame and the upper fixed frame are both rotatably connected to the rotating shaft, and the other end of the lower fixed frame is rotatably connected to the lower end of the locking screw, and the upper end of the locking screw is clamped to the other end of the upper fixed frame through a nut.

[0009] Furthermore, three sliders are slidably connected to the upper fixed frame, and the lower ends of the three sliders are fixed to the side plates. Fixed screws are inserted into the sliders, one end of the fixed screws rests on the sliders, and the other end of the fixed screws rests on the support seat through a nut, and the support seat is fixed to the upper fixed frame.

[0010] Furthermore, the fixed pipe is butted against one end of the connecting pipe, the side plate is against an outer wall of the connecting pipe, and the inner wall of the upper fixed frame is slidably connected to an outer wall of the connecting pipe.

[0011] Furthermore, a long groove is provided at the joint between the fixed tube and the connecting tube, and an air sealing ring is provided in the long groove. The air sealing ring is connected to the gas cylinder through the connecting tube. The gas cylinder is fixed on the fixed tube, and a piston is slidably connected inside the gas cylinder. The tail of the piston slides in the rotating wheel, and the rotating wheel is threadedly connected to the fixed tube.

[0012] Furthermore, two detection components are fixed at the bottom of the valve body. The two detection components have the same structure and are respectively located on both sides of the positioning rod. The detection components include a lower shell, which is fixed at the bottom of the valve body. The lower shell is connected to the valve body through a groove. A threaded plate is fixed at the lower end of the lower shell. The threaded plate is threadedly connected to the pressure cover. The pressure cover squeezes the bottom plate to the bottom of the lower shell. Two sealing rings are provided between the bottom plate and the lower shell. A flow rate detector is fixed on the bottom plate. Two packings are provided at the connection between the bottom plate and the flow rate detector. The flow rate detector is slidably connected to the pressure cover.

[0013] Furthermore, a support assembly is fixed at the bottom of the detection assembly, and the support assembly includes an upper rod, which is fixed at the bottom of the base plate, and is rotatably connected to the lower rod. Both the upper rod and the lower rod are slidably connected to the limiting tube, and a spring four is provided between the limiting tube and the base plate. The lower rod is slidably connected to the outer rod, and a pressure rod is slidably connected inside the outer rod. The front end of the pressure rod is inserted into a tooth groove provided in the lower rod, and a spring five is provided between the pressure rod and the inner wall of the outer rod, and the pressure rod is rotatably connected to the pull rod.

[0014] Furthermore, the outer rod is rotatably connected to the upper end of adapter one, the lower end of the adapter is rotatably connected to adapter two, adapter two is rotatably connected to adapter three, adapter three is inserted into the strap, adapter three is fixedly connected to the strap by two fixing nuts, both ends of the strap are fixed by a screw assembly, 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, adapter two is clamped in the grooves, and the protrusions are against the lower end of adapter two.

[0015] The advantages of the present invention are:

[0016] 1. Through the steering assembly, the positioning rod is driven to rotate 180 degrees, and the annular valve seat, left valve disc and right valve disc in the valve body are driven to rotate 180 degrees, thereby changing the check direction of the valve body to adapt to the pipeline that temporarily changes the fluid guide direction. There is no need to remove the overall check valve. It only needs to drive the positioning rod to rotate 180 degrees through the steering assembly. The operation is convenient and quick;

[0017] 2. Through the steering assembly, the positioning rod is driven to rotate 90 degrees, and the annular valve seat, left valve disc and right valve disc in the valve body are driven to rotate 90 degrees. At this time, the left valve disc and the right valve disc are set parallel to the fluid flow direction. The left valve disc and the right valve disc do not play the role of conduction or check. The valve body acts as an ordinary connecting pipe to adapt to different usage conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The overall structure of the present invention is shown in FIG. Figure 1 ;

[0019] Figure 2 The overall structure of the present invention is shown in FIG. Figure 2 ;

[0020] Figure 3 The steering assembly structure of the present invention is schematically shown in FIG. Figure 1 ;

[0021] Figure 4 The steering assembly structure of the present invention is schematically shown in FIG. Figure 2 ;

[0022] Figure 5 The steering assembly structure of the present invention is schematically shown in FIG. Figure 3 ;

[0023] Figure 6 for Figure 5 A partial enlarged view of the middle part;

[0024] Figure 7 The steering assembly structure of the present invention is schematically shown in FIG. Figure 4 ;

[0025] Figure 8 The structure of the airtight seal assembly of the present invention is schematically shown in FIG. Figure 1 ;

[0026] Fig. 9 The structure of the airtight seal assembly of the present invention is schematically shown in FIG. Figure 2 ;

[0027] Fig.10 The structure of the airtight seal assembly of the present invention is schematically shown in FIG. Figure 3 ;

[0028] Fig.11 for Fig.10 A partial enlarged view of point B in the middle;

[0029] Fig.12 The structure of the detection component of the present invention is shown in FIG. Figure 1 ;

[0030] Fig.13 for Fig.12 A partial enlarged view of point C in the middle;

[0031] Fig.14 The structure of the detection component of the present invention is shown in FIG. Figure 2 ;

[0032] Fig.15 The structure of the detection component of the present invention is shown in FIG. Figure 3 ;

[0033] Fig.16 for Fig.15 A partial enlarged view of point D in the middle;

[0034] Fig.17 for Fig.15 A partial enlarged view of point E in the middle;

[0035] Fig.18 for Fig.15 A partial enlarged view of point F in the middle;

[0036] Description of the markings in the figure:

[0037] Valve body 1; support tube 2; annular valve seat 3; left valve disc 4; right valve disc 5; positioning rod 6; spring 1 7; upper rotary drum 8; spring 2 9; lower rotary drum 10; sealing ring 1 11; packing 1 12; cross 13; spring 3 14; limit column 15; rotating rod 16; limit groove 1 17; limit groove 2 18; connecting shaft 19; notch 20; fixing tube 21; connecting tube 1 22; connecting rod 23; lower fixing frame 24; upper fixing frame 25; locking screw 26; slider 27; side plate 28; fixing screw 29; support seat 30 ; long groove 31; air sealing ring 32; connecting pipe 2 33; air cylinder 34; piston 35; rotor 36; lower shell 37; flow rate detector 38; packing 2 39; bottom plate 40; sealing ring 2 41; threaded plate 42; pressure cover 43; upper rod 44; lower rod 45; spring 4 46; limit tube 47; tooth groove 48; pressure rod 49; spring 50; pull rod 51; outer rod 52; adapter 1 53; adapter 2 54; adapter 3 55; strap 56; fixing nut 57; screw 3 58; protrusion 59; groove 60. DETAILED DESCRIPTION

[0038] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of 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.

[0039] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0040] Embodiment 1

[0041] like Figure 1-18 As shown, a low-temperature double-valve disc check valve comprises a valve body 1, a positioning rod 6 is rotatably connected in 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;

[0042] The working principle of the above technical solution is as follows: the fluid enters the valve body 1 from the left side of the valve body 1, and the fluid is pressed on the left valve flap 4 and the right valve flap 5. The fluid squeezes the left valve flap 4 and the upper rotating cylinder 8 is used as the axis to rotate on the positioning rod 6, driving the spring 7 to deform, and the fluid squeezes the right valve flap 5 and the lower rotating cylinder 10 is used as the axis to rotate on the positioning rod 6. The left valve flap 4 and the right valve flap 5 are separated from the annular valve seat 3, which is convenient for the fluid to pass through and pass from the right side of the valve body 1. When the fluid in the valve body 1 wants to pass from the right to the left, the edges of the left valve flap 4 and the right valve flap 5 are against the annular valve seat 3, so that the left valve flap 4 and the right valve flap 5 cannot be rotated to open, and then the fluid can only flow from left to right, and cannot flow from right to left, achieving a check effect.

[0043] Through the steering assembly, the positioning rod 6 is driven to rotate 180 degrees, and the annular valve seat 3, the left valve disc 4 and the right valve disc 5 in the valve body 1 are driven to rotate 180 degrees, thereby changing the check direction of the valve body, so that the fluid cannot flow from left to right in the valve body 1, but can only flow from right to left. It is suitable for temporarily changing the direction of the fluid guide. There is no need to remove the overall check valve. It only needs to drive the positioning rod 6 to rotate 180 degrees through the steering assembly. The operation is convenient and quick;

[0044] Through the steering assembly, the positioning rod 6 is driven to rotate 90 degrees, and the annular valve seat 3, the left valve flap 4 and the right valve flap 5 in the valve body 1 are driven to rotate 90 degrees. At this time, the left valve flap 4 and the right valve flap 5 are arranged parallel to the fluid flow direction. The left valve flap 4 and the right valve flap 5 do not play a role of conduction or non-return. The valve body 1 acts as an ordinary connecting pipe to adapt to different usage conditions.

[0045] Embodiment 2

[0046] like Figure 1-18 As shown, the steering assembly includes a limit column 15, which is fixed to the upper end of the positioning rod 6, and the limit column 15 is slidably connected to the cross 13, and the cross 13 slides in the support tube 2, and the support tube 2 is fixed on the valve body 1. A spring three 14 is provided between the inner wall of the support tube 2 and the cross 13, and the cross 13 is fixedly connected to the rotating rod 16 through a connecting shaft 19. Two limit grooves 17 and one limit groove 2 18 are provided on the top of the support tube 2, and the tail of the rotating rod 16 is clamped in the limit groove 17 or the limit groove 2 18;

[0047] The working principle of the above technical solution is as follows: the direction pointed by the tail of the rotating rod 16 is the fluid conduction direction in the check valve, and the opposite direction is the fluid check direction. When the fluid check direction needs to be changed, the rotating rod 16 is pulled upward, and the cross 13 is driven to move upward through the connecting shaft 19, and the spring three 14 is compressed. When the tail of the rotating rod 16 is disengaged from the limiting groove 17, the rotating rod 16 is rotated 180 degrees, and the cross 13 is driven to rotate 180 degrees through the connecting shaft 19, and the limiting column 15 is driven to rotate 180 degrees. degrees, driving the positioning rod 6 to rotate 180 degrees, driving the annular valve seat 3, the left valve disc 4, the right valve disc 5, the spring 1 7, the upper rotating cylinder 8, the spring 2 9 and the lower rotating cylinder 10 to rotate 180 degrees with the positioning rod 6. After the rotating rod 16 rotates 180 degrees, it is restricted from opening the rotating rod 16. Under the elastic force of the spring 3 14, the cross 13 is driven to move downward, and the rotating rod 16 is driven to move downward through the connecting shaft 19. The tail of the rotating rod 16 is clamped into another limiting groove 17, thereby changing the fluid check direction;

[0048] If the positioning rod 6 is rotated 90 degrees, the annular valve seat 3, the left valve disc 4, the right valve disc 5, the spring 1 7, the upper rotating cylinder 8, the spring 2 9 and the lower rotating cylinder 10 will follow the positioning rod 6 to rotate 90 degrees, and the tail of the positioning rod 6 will be engaged in the limiting groove 2 18. At this time, the left valve disc 4 and the right valve disc 5 are both arranged parallel to the fluid direction. The left valve disc 4 and the right valve disc 5 do not play the role of conduction and non-return. The valve body 1 plays the role of an ordinary connecting pipe. Then, by rotating the rotating rod 16, the non-return direction and function of the non-return valve can be changed to adapt to different usage conditions.

[0049] Embodiment 3

[0050] like Figure 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 rotation connection point between the positioning rod 6 and the valve body 1;

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

[0052] Embodiment 4

[0053] like Figure 1-18 As shown, both ends of the valve body 1 are provided with air sealing components, and the air sealing components include a fixed tube 21, which is fixed to the end of the valve body 1, and the fixed tube 21 is fixedly connected to the rotating shaft through a connecting rod 23, and one end of the lower fixed frame 24 and the upper fixed frame 25 are both rotatably connected to the rotating shaft, and the other end of the lower fixed frame 24 is rotatably connected to the lower end of the locking screw 26, and the upper end of the locking screw 26 is clamped to the other end of the upper fixed frame 25 through a nut;

[0054] The upper fixed frame 25 is slidably connected with three sliders 27, the lower ends of the three sliders 27 are fixed to the side plates 28, and 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, and the support seat 30 is fixed to the upper fixed frame 25;

[0055] The fixed pipe 21 is butted against the end of the connecting pipe 22, the side plate 28 is against the outer wall of the connecting pipe 22, and the inner wall of the upper fixed frame 25 is slidably connected with the outer wall of the connecting pipe 22;

[0056] A long groove 31 is provided at the joint between the fixed tube 21 and the connecting tube 1 22, and a gas sealing ring 32 is provided in the long groove 31. The gas sealing ring 32 is connected to the gas cylinder 34 through the connecting tube 2 33. The gas cylinder 34 is fixed on the fixed tube 21. A piston 35 is slidably connected in the gas cylinder 34. The tail of the piston 35 slides in the rotating wheel 36. The rotating wheel 36 is threadedly connected to the fixed tube 21.

[0057] The working principle of the above technical solution is as follows: remove the nut on the locking screw 26, remove the upper end of the locking screw 26 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 pipe 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 pipe 21, and connect the connecting pipe 22 to the fixing pipe 21;

[0058] The lower fixing frame 24 and the upper fixing frame 25 are rotated again, and the lower fixing frame 24 and the upper fixing frame 25 are aggregated. The upper fixing frame 25 and the lower fixing frame 24 have the same structure, and the fixing tube 21 and the end of the connecting tube 22 are clamped. The side plate 28 is against the outer wall of the connecting tube 22. The inner walls of the upper fixing frame 25 and the lower fixing frame 24 are against the outer wall of the connecting tube 22. The lower end of the locking screw 26 is rotatably connected to the lower fixing frame 24, and the upper end of the locking screw 26 is inserted into the card slot of the upper fixing frame 25 and fixed by a nut. As the nut is continuously tightened, the upper fixing frame 25 and the end of the lower fixing frame 24 are squeezed closer to each other, and the upper fixing frame 25 and the fixing tube 21 slide, driving the lower fixing frame 24 and the fixing tube 21 to slide, and further clamping the contact end of the fixing tube 21 and the connecting tube 22;

[0059] The rotating wheel 36 is rotated to drive the rotating wheel 36 and the fixed tube 21 to rotate in a threaded manner, and the rotating wheel 36 is driven to move on the fixed tube 21 toward the upper fixed frame 25. The rotating wheel 36 squeezes the piston 35 to move forward, and the piston 35 moves forward in the gas cylinder 34, squeezing the gas in the gas cylinder 34 into the gas sealing ring 32 through the connecting tube 2 33, and the gas sealing ring 32 is inflated. The expanded gas sealing ring 32 is squeezed between the fixed tube 21 and the connecting tube 1 22, thereby increasing the sealing performance of the connection between the fixed tube 21 and the connecting tube 1 22;

[0060] Since there is a certain gap between the upper end of the connecting tube 22 and the upper fixed frame 25, and between the lower end of the connecting tube 22 and the lower fixed frame 24, when the valve body 1 is vibrated, a certain sliding occurs between the fixed tube 21 and the connecting tube 22, and the gas sealing ring 32 undergoes a certain deformation, so that the valve body 1 has a certain shock absorbing effect. Since the gas sealing ring 32 is filled with gas, when it is deformed, both sides will be tightly attached to the fixed tube 21 and the connecting tube 22, and its sealing performance will not be affected.

[0061] Loosen the nut at the end of the fixing screw 29, slide the slider 27 on the upper fixed frame 25, drive the side plate 28 to move with the slider 27, and then change the distance between the side plate 28 and the other end of the upper fixed frame 25, so as to adapt to the connecting pipe 22 of different thickness models, with strong adaptability.

[0062] Embodiment 5

[0063] like Figure 1-18As shown, two detection components are fixed at the bottom of the valve body 1, and the two detection components have the same structure and are respectively located on both sides of the positioning rod 6. The detection components include a lower shell 37, which 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 the notch 20. A threaded plate 42 is fixed at the lower end of the lower shell 37, and the threaded plate 42 is threadedly connected to a pressure cover 43. The pressure cover 43 squeezes the bottom plate 40 at the bottom of the lower shell 37. A sealing ring 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 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 cover 43.

[0064] A support assembly is fixed at the bottom of the detection assembly, and the support assembly includes an upper rod 44, which is fixed to the bottom of the bottom plate 40, and is rotatably connected to a lower rod 45. Both the upper rod 44 and the lower rod 45 are slidably connected to a limit tube 47, and a spring 46 is provided between the limit tube 47 and the bottom plate 40. The lower rod 45 is slidably connected to an outer rod 52, and a pressure rod 49 is slidably connected inside the outer rod 52. The front end of the pressure rod 49 is inserted into a tooth groove 48 provided in the lower rod 45, and a spring 50 is provided between the pressure rod 49 and the inner wall of the outer rod 52, and the pressure rod 49 is rotatably connected to the pull rod 51;

[0065] The outer rod 52 is rotatably connected to the upper end of the adapter 1 53, the lower end of the adapter 1 53 is rotatably connected to the adapter 2 54, the adapter 2 54 is rotatably connected to the adapter 3 55, the adapter 3 55 is inserted into the binding band 56, the adapter 3 55 is fixedly connected to the binding band 56 through two fixing nuts 57, and the two ends of the binding band 56 are fixed by screw rod assemblies 58. The lower end of the outer rod 52 is provided with four grooves 60 in different directions, and the side edges of the grooves 60 are provided with protrusions 59. The adapter 2 54 is clamped in the grooves 60, and the protrusions 59 are against the lower end of the adapter 2 54;

[0066] The working principle of the above technical solution is: flow rate detectors 38 are provided on both sides of the positioning rod 6, and the two flow rate detectors 38 respectively detect the fluid flow rates on both sides of the positioning rod 6, and can judge whether the opening and closing action and the check action of the left valve flap 4 and the right valve flap 5 are normal according to the fluid flow rates on both sides;

[0067] After the check valve is used for a long time, impurities will be present 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. These impurities affect the opening and closing of the left valve disc 4 and the right valve disc 5, and affect the check effect. The gland 43 is rotated, and the gland 43 and the threaded plate 42 are threadedly rotated, and then the gland 43 is removed. Without the restriction of the gland 43 on the bottom plate 40, the bottom plate 40 and the flow rate detector 38 can be removed together, and then the lower shell 37 and the notch 20 can be passed through to clean the inside of the valve body 1;

[0068] The slot 20 is in the shape of a long slot. Compared with the traditional circular cleaning hole, the long slot cleaning hole has a larger opening and is more convenient for tools to enter. The filler 2 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 which can be placed against the ground or a building to lift the valve body 1, thereby preventing the check valve from being too heavy and increasing the burden on the connecting support rod pipes at both ends. The binding band 56 is made of stainless steel, and its lower end is flush with the lower end of the outer rod 52, thereby increasing the support area of ​​the support rod group and increasing the support stability.

[0070] Pulling the pull rod 51 drives the pressure rod 49 to be pulled outward, driving the spring 50 to be compressed, driving the lower end of the pressure rod 49 to separate from the tooth groove 48, at this time, the lower rod 45 and the outer rod 52 can slide, thereby changing the overall length of the support rod group, thereby adapting to supports of different heights. After the adjustment is completed, the restriction on the pull rod 51 is released, and under the elastic force of the spring 50, the front end of the pressure rod 49 is driven to be clamped into the tooth groove 48 to prevent the lower rod 45 and the outer rod 52 from sliding automatically, and the pull rod 51 is bent downward to save space;

[0071] In addition to increasing the supporting area, the strap 56 can be tied to other pipes to share the weight of the check valve through other pipes. The strap 56 rotates with the adapter 2 54 through the adapter 3 55, so that the strap 56 can be fixed to other pipes at different angles. Pressing the strap 56 downward drives the adapter 2 54 to disengage from the groove 60, and the adapter 2 54 and the adapter 1 53 rotate. The strap 56 is rotated to drive the adapter 2 54 and the adapter 1 53 to rotate, so that the adapter 2 54 can be clamped in the groove 60 in other directions, thereby changing the position and direction of the strap 56. In addition, the strap 56 can be fixed to other pipes at multiple angles and positions without losing the supporting force. The protrusion 59 serves to limit the adapter 2 54.

[0072] The support assembly can be folded and stored to reduce the space it occupies. The specific storage method is: pull the pull rod 51 to drive the pressure rod 49 to move outward, drive the spring 50 to be compressed, drive the front end of the pressure rod 49 to separate from the tooth groove 48, slide the outer rod 52 to the uppermost end, and shorten the length of the entire support rod group;

[0073] Press the strap 56 downward so that the strap 56 is in a vertical position;

[0074] The upward sliding limit tube 47 causes the spring four 46 to be compressed, so that the limit tube 47 is separated from the lower rod 45, and the lower rod 45 is rotated ninety degrees, so that the outer rod 52 and the strap 56 are rotated ninety degrees along with the lower rod 45, so that the lower rod 45, the outer rod 52 and the strap 56 remain in a horizontal state, thereby completing the folding and storage of the support assembly and reducing the space it occupies.

[0075] It is to be understood that the present invention is described by some embodiments, and it is known to those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. A low temperature double disc check valve, characterized in that: The valve body (1) comprises 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 a left valve flap (4) via an upper rotating cylinder (8), the positioning rod (6) being rotatably connected to a right valve flap (5) via a lower rotating cylinder (10), a spring 1 (7) being provided between the positioning rod (6) and the upper rotating cylinder (8), a spring 2 (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).

2. A low temperature double disc check valve according to claim 1, characterized in that: The steering assembly comprises a limit column (15), the limit column (15) is fixed on the upper end of the positioning rod (6), the limit column (15) is slidably connected to the cross (13), the cross (13) slides in the support tube (2), the support tube (2) is fixed on 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 a connecting shaft (19), two limit grooves one (17) and one limit groove two (18) are provided on the top of the support tube (2), and the tail of the rotating rod (16) is clamped in the limit groove one (17) or the limit groove two (18).

3. A low temperature double disc check valve according to claim 2, 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 rotational connection point between the positioning rod (6) and the valve body (1).

4. A low temperature double disc check valve according to claim 1, characterized in that: Both ends of the valve body (1) are provided with an air sealing assembly, the air sealing assembly comprising a fixed tube (21), the fixed tube (21) being fixed to the end of the valve body (1), the fixed tube (21) being fixedly connected to the rotating shaft via a connecting rod (23), one end of the lower fixed frame (24) and the upper fixed frame (25) being rotatably connected to the rotating shaft, the other end of the lower fixed frame (24) being rotatably connected to the lower end of a locking screw (26), and the upper end of the locking screw (26) being clamped to the other end of the upper fixed frame (25) via a nut.

5. A low temperature double disc check valve according to claim 4, characterized in that: The upper fixed frame (25) is slidably connected with three sliders (27), the lower ends of the three sliders (27) are fixed to the side plates (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 a support seat (30) through a nut, and the support seat (30) is fixed to the upper fixed frame (25).

6. A low temperature double disc check valve according to claim 5, characterized in that: The fixed pipe (21) is butted against the end of the connecting pipe (22), the side plate (28) is against the outer wall of the connecting pipe (22), and the inner wall of the upper fixed frame (25) is slidably connected to the outer wall of the connecting pipe (22).

7. A low temperature double disc check valve according to claim 6, characterized in that: A long groove (31) is provided at the joint between the fixed pipe (21) and the first connecting pipe (22), a gas sealing ring (32) is provided in the long groove (31), the gas sealing ring (32) is connected with a gas cylinder (34) through a second connecting pipe (33), the gas cylinder (34) is fixed on the fixed pipe (21), a piston (35) is slidably connected in the gas cylinder (34), the tail of the piston (35) slides in a rotating wheel (36), and the rotating wheel (36) is threadedly connected to the fixed pipe (21).

8. The low temperature 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 respectively 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 notch (20). A threaded plate (42) is fixed at the lower end of the lower shell (37). The threaded plate (42) is threadedly connected to a pressure cover (43). The pressure cover (43) squeezes the bottom plate (40) at the bottom of the lower shell (37). A sealing ring (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 (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 cover (43).

9. A low temperature double disc check valve according to claim 8, characterized in that: A support assembly is fixed at the bottom of the detection assembly, and the support assembly includes an upper rod (44), which is fixed at the bottom of the base plate (40), the upper rod (44) is rotatably connected to the lower rod (45), the upper rod (44) and the lower rod (45) are both slidably connected to the limit tube (47), a spring four (46) is provided between the limit 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 a tooth groove (48) provided in the lower rod (45), a spring five (50) is provided between the pressure rod (49) and the inner wall of the outer rod (52), and the pressure rod (49) is rotatably connected to the pull rod (51).

10. A low temperature double disc check valve according to claim 9, characterized in that: The outer rod (52) is rotatably connected to the upper end of the first adapter (53), the lower end of the first adapter (53) is rotatably connected to the second adapter (54), the second adapter (54) is rotatably connected to the third adapter (55), the third adapter (55) is inserted into the binding belt (56), the third adapter (55) is fixedly connected to the binding belt (56) through two fixing nuts (57), and the two ends of the binding belt (56) are fixed by a screw assembly (58). The lower end of the outer rod (52) is provided with four grooves (60) in different directions, and the side edge of the groove (60) is provided with a protrusion (59), the second adapter (54) is clamped in the groove (60), and the protrusion (59) is against the lower end of the second adapter (54).

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