Plug-in type built-in double-disc check valve

Abstract

The present invention relates to the technical field of check valves. More specifically, it relates to a plug-in type built-in double valve flap check valve, which includes: a valve body, wherein a first keyway and a pin hole are provided inside the valve body; a plug-in type bracket, the pin shaft head of the plug-in type bracket is inserted into the pin hole, and the second keyway on the plug-in type bracket is arranged in alignment with the inner side of the first keyway; a locking key, the locking key is inserted into the second keyway and the first keyway to plug and fix the plug-in type bracket and the valve body; a valve flap assembly, the valve flap assembly is movably connected to the plug-in type bracket and is sealingly fitted inside the valve body. The plug-in type built-in double valve flap check valve of the present invention avoids the leakage links at the rotating shaft and the retaining shaft of the external double valve flap check valve, makes the sealing performance more reliable, makes the processing and assembly processes simpler and more accurate, reduces the cost, and the appearance is also more neat and beautiful.

Description

Technical Field

[0001] The present invention relates to the technical field of check valves, and more specifically, to a plug-in type built-in double valve flap check valve. Background Art

[0002] Double valve flap check valves are widely used due to their small size and light weight. Most of the original double valve flap check valves are external type, that is, the rotating shaft and the retaining shaft penetrate from the outside of the valve body, and 2 or 4 screw plugs or packing seals are required, which undoubtedly increases the leakage links. In addition, the lateral drilling and tapping on the valve body are difficult and inaccurate, and the quality cannot be guaranteed. Later, the emerging built-in double valve flap check valves are either very complex in structure and poor in processability; or a crescent groove is milled on the flange surface to install the bracket, sacrificing the width of the flange sealing surface and affecting the reliability of the flange seal. Summary of the Invention

[0003] The purpose of the present invention is to provide a plug-in type built-in double valve flap check valve, which can effectively solve the problems in the prior art.

[0004] The purpose of the present invention is achieved through the following technical solutions:

[0005] The plug-in type built-in double valve flap check valve includes: a valve body, two first key grooves and two pin holes are arranged inside the valve body; two plug-in type brackets, the pin shaft heads of the two plug-in type brackets are inserted into the two pin holes, and the second key grooves on the two plug-in type brackets are aligned and arranged inside the two first key grooves; two locking keys, each locking key is inserted and matched with the combination of the second key groove and the first key groove on the same side to relatively fix the two plug-in type brackets and the valve body; a valve flap assembly, the valve flap assembly is movably connected between the two plug-in type brackets and is sealingly matched inside the valve body.

[0006] Preferably, the valve flap assembly includes: valve flaps, a rotating shaft, a retaining shaft, and a torsion spring; there are two valve flaps, and the two valve flaps are sleeved on both sides of the rotating shaft; the torsion spring is sleeved on the retaining shaft, and the two torsion arms of the torsion spring resist against the end faces of the two valve flaps far away from the valve body inlet; two rotating shaft insertion holes and two retaining shaft insertion holes are arranged on both of the two plug-in type brackets; both ends of the rotating shaft are inserted and matched with the rotating shaft insertion holes of the two plug-in type brackets, and both ends of the retaining shaft are inserted and matched with the retaining shaft insertion holes of the two plug-in type brackets.

[0007] Preferably, the valve flap assembly further includes locking nuts; two locking nuts are threadedly matched on the retaining shaft, and the two locking nuts press against the inner side surfaces of the two locking keys.

[0008] Preferably, the valve flap assembly further includes retaining washers, two retaining washers are sleeved on the retaining shaft, the two retaining washers are located outside the two locking nuts and inside the two locking keys.

[0009] Preferably, two bendable lugs are provided on the stop washer, and after the two lugs are bent, they abut against the end face of the locking key.

[0010] Preferably, one end of the stop washer is provided with a bendable edge, and after the bendable edge is bent, it abuts against one side surface of the lock nut.

[0011] Preferably, a cross bar is provided on the inner circular surface of the valve body, and the cross bar abuts against the end faces of the two valve flaps far from the torsion spring.

[0012] Preferably, a lifting ring is provided on the outer side surface of the valve body.

[0013] Preferably, both the first keyway and the second keyway are arc-shaped keyways, and the locking key is an arc-shaped square key.

[0014] The embodiments of the present invention bring the following beneficial effects:

[0015] The built-in double-valve-flap check valve of the present invention avoids at least two leakage links at the rotating shaft and the stop shaft of the external double-valve-flap check valve, making the sealing performance more reliable, making the processing and assembly processes simpler and more accurate, reducing the cost, and the appearance is also more tidy and beautiful; the built-in double-valve-flap check valve of the present invention is internally provided with a valve body maintenance component that can automatically clean the inner wall of the valve body, reducing the influence of scale on the inner wall of the valve body on the conveying effect of the valve body; in addition to the function of automatically cleaning the inner wall of the valve body, the valve body maintenance component can also be used to control the continuous opening or closing of the valve flap, so that the valve flap can be used as a two-way valve, changing the function of the valve flap.

[0016] In order to make the above objects, features and advantages of the present invention more obvious and understandable, the following specific preferred embodiments are given below in conjunction with the accompanying drawings and described in detail as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the related art, the following will briefly introduce the drawings required to be used in the description of the specific embodiments or the related technical solutions. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0018] Figure 1 Structural schematic provided by the embodiment of the present invention Figure 1 ;

[0019] Figure 2 Structural schematic provided by the embodiment of the present invention Figure 2 ;

[0020] Figure 3 Structural schematic provided by the embodiment of the present inventionFigure 3 ;

[0021] Figure 4 Structural schematic provided by the embodiment of the present invention Figure 4 ;

[0022] Figure 5 Structural schematic of the valve body maintenance component provided by the embodiment of the present invention Figure 1 ;

[0023] Figure 6 Structural schematic of the valve body maintenance component provided by the embodiment of the present invention Figure 2 ;

[0024] Figure 7 Structural schematic diagram of the sliding scraping ring unit provided by the embodiment of the present invention;

[0025] Figure 8 Structural schematic diagram of the guide tube unit provided by the embodiment of the present invention;

[0026] Figure 9 Structural schematic diagram of the fixed ring unit provided by the embodiment of the present invention;

[0027] Figure 10 Structural schematic diagram of the modified diversion tube assembly provided by the embodiment of the present invention;

[0028] Figure 11 Cross-sectional view of the valve body maintenance component provided by the embodiment of the present invention.

[0029] Icon: Valve body 1; Valve flap 2; Rotating shaft 3; Locking key 4; Plug-in bracket 5; Stop washer 6; Locking nut 7; Stop shaft 8; Torsion spring 9; Suspension ring 10; Valve body maintenance component 11; Hinge seat 12; Tilted connecting rod 13; Sliding scraping ring unit 14; Fixed scraping ring 141; Movable scraping ring 142; Guide shaft 143; Limit piece 144; Return compression spring 145; Guide tube unit 15; External thread guide tube 151; Limit retaining ring 152; Ring seat 153; External thread control rod 154; Disc slider 155; Limit stop block 156; Compression spring 16; Fixed ring unit 17; Fixed ring body 171; Insertion slider 172; Unlock compression spring 173; Unlock dial 174; Maintenance diversion tube assembly 18; Horizontal diversion tube 181; Maintenance end cover 182; Vertical diversion tube 183. Detailed implementation manners

[0030] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.

[0031] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly disposed on the other element; when an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0032] It should be understood that the orientation or positional relationships indicated by terms such as "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings. It is only for the convenience of describing this application 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 thus cannot be construed as a limitation to this application.

[0033] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this application, "multiple" and "several" mean two or more, unless otherwise specifically defined.

[0034] It should be noted that the structures, ratios, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the limiting conditions under which this application can be implemented. Therefore, they do not have a substantial technical meaning. Any modification of the structure, change in the proportional relationship, or adjustment of the size, without affecting the effects that this application can produce and the purposes that can be achieved, should still fall within the scope that can be covered by the technical content disclosed in this application. At the same time, the terms such as "upper", "lower", "left", "right", "middle", and "one" cited in this specification are only for the convenience of clear narration and are not used to limit the scope under which this application can be implemented. The change or adjustment of their relative relationships, without substantial change in the technical content, should also be regarded as the scope within which this application can be implemented.

[0035] The following is a further detailed description of the present invention in conjunction with the attached Figure 1-11 drawings.

[0036] Embodiment 1

[0037] As Figure 1-11 shown, the plug-in type built-in double-flap check valve includes: a valve body 1, and two first keyways and two pin holes are arranged inside the valve body 1; two plug-in brackets 5, the pin heads of the two plug-in brackets 5 are inserted into the two pin holes, and the second keyways on the two plug-in brackets 5 are aligned and arranged inside the two first keyways; two locking keys 4, each locking key 4 is inserted and matched with the combination of the second keyway and the first keyway on the same side, so that the two plug-in brackets 5 and the valve body 1 are relatively fixed; a flap assembly, the flap assembly is movably connected between the two plug-in brackets 5 and is sealingly fitted inside the valve body 1. When the plug-in type built-in double-flap check valve of the present invention is in use, one end of the valve body 1 is connected to a liquid inlet pipe, and the liquid inside the liquid inlet pipe pushes the flap assembly to open inside the valve body 1 under the action of pressure, so that the liquid can flow unidirectionally inside the valve body 1. In the plug-in type built-in double-flap check valve of the present invention, the plug-in bracket 5 is stably installed inside the valve body 1 through the cooperation of the installation of the locking key 4 and the plug-in bracket 5, and the flap assembly is supported and installed through the plug-in bracket 5, without punching holes in the valve body 1, avoiding at least two leakage links at the rotating shaft and the retaining shaft of the external double-flap check valve, making the sealing performance more reliable, making the processing and assembly processes simpler and more accurate, reducing the cost, and the appearance is also more neat and beautiful.

[0038] The flap assembly includes: flaps 2, a rotating shaft 3, a retaining shaft 8, and a torsion spring 9; there are two flaps 2, and the two flaps 2 are sleeved on both sides of the rotating shaft 3; the torsion spring 9 is sleeved on the retaining shaft 8, and the two torsion arms of the torsion spring 9 abut against the end faces of the two flaps 2 far from the inlet of the valve body 1; rotating shaft insertion holes and retaining shaft insertion holes are provided on both of the two plug-in brackets 5; both ends of the rotating shaft 3 are inserted and matched with the rotating shaft insertion holes of the two plug-in brackets 5, and both ends of the retaining shaft 8 are inserted and matched with the retaining shaft insertion holes of the two plug-in brackets 5.

[0039] When in use, the liquid impacts the two flaps 2 and generates pressure, thereby driving the two flaps 2 to rotate around the axis of the rotating shaft 3 and generating pressure on the two torsion arms of the torsion spring 9, so that the two torsion arms are twisted, thereby realizing the opening of the valve body 1 and realizing the unidirectional liquid delivery of the valve body 1. When the liquid flows reversely, the two flaps 2 are kept closed at the inlet of the valve body 1 under the elastic force of the two torsion arms of the torsion spring 9 to prevent the liquid from flowing back.

[0040] The flap assembly further includes locking nuts 7; two locking nuts 7 are threadedly engaged on the retaining shaft 8, and the two locking nuts 7 abut against the inner side surfaces of the two locking keys 4. By pressing the locking keys 4 with the locking nuts 7, the stability of the locking keys 4 limiting the plug-in brackets 5 is improved, and the stability during the use of the present invention is improved.

[0041] The valve flap assembly further includes a stop washer 6. Two stop washers 6 are sleeved on the stop shaft 8. The two stop washers 6 are located outside the two locking nuts 7 and inside the two locking keys 4. The setting of the stop washer 6 is used to improve the locking effect of the locking nut 7 on the locking key 4.

[0042] Two bendable retaining ears are provided on the stop washer 6. After the two retaining ears are bent, they abut against the end face of the locking key 4.

[0043] One end of the stop washer 6 is provided with a bendable edge. After the bendable edge is bent, it abuts against one side surface of the locking nut 7. Thus, the locking nut 7 is effectively limited, preventing the locking nut 7 from rotating after being locked and ensuring the locking effect.

[0044] A cross bar is provided on the inner circular surface of the valve body 1. The cross bar abuts against the end faces of the two valve flaps 2 away from the torsion spring 9.

[0045] A lifting ring 10 is provided on the outer side surface of the valve body 1.

[0046] Both the first keyway and the second keyway are arc-shaped keyways, and the locking key 4 is an arc-shaped square key.

[0047] The plug-in type built-in double-valve-flap check valve further includes a valve body maintenance assembly 11; the valve body maintenance assembly 11 includes a hinge seat 12, an inclined connecting rod 13, a sliding scraping ring unit 14, a guide tube unit 15, a compression spring 16 and a fixing ring unit 17;

[0048] There are two inclined connecting rods 13. One ends of the two inclined connecting rods 13 are rotatably and relatively fitted on both sides in the middle of the sliding scraping ring unit 14. The other ends of the two inclined connecting rods 13 are respectively rotatably connected to a hinge seat 12. The two hinge seats 12 are relatively fixed on the outer sides of the end faces of the two valve flaps 2 away from the inlet of the valve body 1. The sliding scraping ring unit 14 is slidably fitted on the inner wall of the valve body 1. The sliding scraping ring unit 14 is slidably fitted on the guide tube unit 15. The middle part of the guide tube unit 15 is threadedly fitted on the fixing ring unit 17. The fixing ring unit 17 is detachably connected to the inner wall of the valve body 1 near the outlet. The compression spring 16 is sleeved on the guide tube unit 15 and is located between the sliding scraping ring unit 14 and the fixing ring unit 17.

[0049] The valve body maintenance component 11 can be used to adjust the pressure required for the valve opening amplitude, clean the inner wall of the valve body, and also has a double reset function to prevent the torsion spring from having insufficient torsion to reset and prevent gaps from being generated after reset, thereby increasing the closing stability. When in use, when the two valve flaps 2 are opened, they can push one end of the two inclined connecting rods 13 to move. Since the two valve flaps 2 approach each other after being opened, the ends of the two inclined connecting rods 13 connected to the two valve flaps 2 approach, and the included angle between the two inclined connecting rods 13 becomes smaller. At this time, the sliding scraping ring unit 14 can be pushed to slide on the inner wall of the valve body 1 to clean the dirt on the inner wall of the valve body 1. When the two valve flaps 2 are closed, the included angle between the two inclined connecting rods 13 becomes larger, which can drive the sliding scraping ring unit 14 to reset and clean the dirt on the inner wall of the valve body 1 again. When the sliding scraping ring unit 14 moves, it can drive the guiding tube unit 15 to slide on the fixed ring unit 17 and compress the compression spring 16. The guiding tube unit 15 plays a role of guiding and limiting, and the compression spring 16 can also play a role of assisting the two valve flaps 2 to reset.

[0050] The sliding scraping ring unit 14 includes a fixed scraping ring 141, a movable scraping ring 142, a guiding shaft 143, a limiting piece 144, and a reset compression spring 145. The fixed scraping ring 141 and the movable scraping ring 142 are both slidably fitted on the inner wall of the valve body 1. The transverse connecting plate in the middle of the fixed scraping ring 141 is slidably fitted on the guiding tube unit 15, and the transverse connecting plate in the middle of the fixed scraping ring 141 is rotatably connected to the two inclined connecting rods 13. A plurality of guiding shafts 143 are slidably fitted on the fixed scraping ring 141. One end of each of the plurality of guiding shafts 143 is fixed to the movable scraping ring 142, and a limiting piece 144 is fixed to the other end of each of the plurality of guiding shafts 143. A reset compression spring 145 is sleeved on the shaft body of each of the plurality of guiding shafts 143 between the movable scraping ring 142 and the fixed scraping ring 141. The movable scraping ring 142 is located between the fixed scraping ring 141 and the valve flap 2. When the sliding scraping ring unit 14 is in use, the two inclined connecting rods 13 can drive the fixed scraping ring 141 to move. When the fixed scraping ring 141 moves, it drives the movable scraping ring 142 to move through the cooperation of the guiding shaft 143, the limiting piece 144, and the reset compression spring 145. Thus, the dirt on the inner wall of the valve body 1 is cleaned through the cooperation of the fixed scraping ring 141 and the movable scraping ring 142. A reset compression spring 145 is arranged between the fixed scraping ring 141 and the movable scraping ring 142. When the two valve flaps 2 are closed and reset, when the fixed scraping ring 141 drives the movable scraping ring 142 to clean the inner wall of the valve body 1, a certain degree of buffering can be achieved through the reset compression spring 145.

[0051] The fixed ring unit 17 includes a fixed ring body 171, a plug-in slider 172, an unlocking pressure spring 173 and an unlocking block 174; the horizontal plate in the middle of the fixed ring body 171 is threadedly matched on the guide tube unit 15, and a plug-in slide is provided at each end of the fixed ring body 171, and the plug-in slider 172 is slidably matched in the two plug-in slides. The outer ends of the two plug-in sliders 172 can be plugged into the plug-in groove of the inner wall of the valve body 1, and the inner ends of the two plug-in sliders 172 are respectively fixed with an unlocking block 174, and the two unlocking blocks 174 slide relatively in the unlocking slide of the horizontal plate in the middle of the fixed ring body 171; the inner ends of the two unlocking blocks 174 are respectively fixed with the outer ends of an unlocking pressure spring 173, and the inner ends of the two unlocking pressure springs 173 are fixed on the inner sides of the two unlocking slides;

[0052] The fixed ring unit 17 and the valve body 1 are structures that are easy to disassemble or install. The unlocking compression spring 173 can be compressed by sliding the unlocking block 174, thereby driving the plug-in slider 172 to disengage from the plug-in groove on the inner wall of the valve body 1, thereby realizing the disassembly of the fixed ring unit 17. Under normal conditions, the plug-in slider 172 remains plugged in the plug-in groove on the inner wall of the valve body 1 under the elastic force of the unlocking compression spring 173.

[0053] The guide tube unit 15 includes an external thread guide tube 151, a limit stop ring 152, an annular seat 153, an external thread control rod 154, a disc slider 155 and a limit stop block 156; one end of the external thread guide tube 151 is fixed with the limit stop ring 152, the external thread guide tube 151 is slidably fitted on the horizontal connecting plate in the middle of the fixed scraper ring 141, the external thread guide tube 151 is threadedly fitted on the horizontal plate in the middle of the fixed ring body 171, the other end of the external thread guide tube 151 is fixedly connected to the annular seat 153, the middle of the external thread control rod 154 is fixedly connected to the external thread guide tube 151, and the external thread guide tube 151 is fixedly connected to the annular seat 153. It is rotatably connected to the annular seat 153, one end of the externally threaded control rod 154 is inserted into the externally threaded guide tube 151, and is threadedly matched with the disc slider 155 sliding in the externally threaded guide tube 151, and the inner ends of a limit stop 156 are respectively fixed at both ends of the disc slider 155, and the middle parts of the two limit stops 156 slide in the two limit slides of the externally threaded guide tube 151, and the outer ends of the two limit stops 156 are located between the cross connecting plate of the fixed scraper ring 141 and the cross plate of the fixed ring body 171, and are located on the inner side of the compression spring 16.

[0054] The guiding pipe unit 15 can not only play a role in guiding and limiting, but also play a role in adjusting the continuous opening or closing of the two valve flaps 2. It can also be converted into a two-way connecting pipe that can adjust the flow rate. When it is necessary to control the continuous opening of the two valve flaps 2, the present invention does not have the function of check valve at this time. The adjustment method is as follows: Rotate the externally threaded guiding pipe 151 to change the contact position between the externally threaded guiding pipe 151 and the fixed ring body 171. Through the cooperation of the externally threaded guiding pipe 151 and the limit retaining ring 152, drive the fixed scraping ring 141 to approach the fixed ring body 171. At this time, the fixed scraping ring 141 drives the two valve flaps 2 to continuously open through the two inclined connecting rods 13; When it is necessary to limit the maximum opening amplitude of the two valve flaps 2, the adjustment method is as follows: Rotate the externally threaded control rod 154 to change the contact position between the externally threaded control rod 154 and the disc slider 155, adjust the position of the limit stop block 156, and adjust the sliding range of the fixed scraping ring 141 on the externally threaded guiding pipe 151 through the limit stop block 156, so as to play a role in limiting the maximum opening amplitude of the valve flap 2; When it is necessary to continuously close the two valve flaps 2, the adjustment method is as follows: Rotate the externally threaded control rod 154 to change its contact position with the disc slider 155, drive the limit stop block 156 to slide in the limit slideway of the externally threaded guiding pipe 151 through the disc slider 155, and control it to press against one side of the fixed scraping ring 141, and at this time, the other side of the fixed scraping ring 141 is in contact with the limit retaining ring 152.

[0055] The plug-in type built-in double-valve-flap check valve further includes a maintenance diversion pipe assembly 18; The maintenance diversion pipe assembly 18 includes a horizontal diversion pipe 181, a maintenance end cover 182 and a vertical diversion pipe 183; One end of the horizontal diversion pipe 181 is hermetically connected and communicated with the outlet of the valve body 1, and the other end of the horizontal diversion pipe 181 is detachably and hermetically connected to the maintenance end cover 182; The lower end of the pipe body of the horizontal diversion pipe 181 is fixedly connected and communicated with the vertical diversion pipe 183 provided with a filter screen through an outflow port. The maintenance diversion pipe assembly 18 is used to change the liquid outflow direction. The maintenance end cover 182 is convenient for disassembly or installation, and is convenient for adjusting the valve body maintenance assembly 11 from the maintenance port; A filter screen is provided in the vertical diversion pipe 183 to facilitate the filtration treatment of the liquid.

[0056] When the plug-in type built-in double-valve-flap check valve is in use, the average flow velocity of the fluid in the valve body 1 is affected by the mass influence coefficient of the valve flap 2 in the present invention, the elastic force influence coefficient of the torsion spring 9 in the present invention, the pressure loss of the valve flap 2 in the present invention, the resistance coefficient of the valve flap 2 in the present invention, and the density of the fluid flowing in the valve body 1. The average flow velocity of the fluid in the valve body 1 can be calculated by Formula 1. Formula 1 is as follows:

[0057]

[0058] In the formula,

[0059] δ is the average flow velocity of the fluid in the valve body 1, m / s;

[0060] ∈a is the mass influence coefficient of the valve flap 2 in the present invention;

[0061] ta is the elastic force influence coefficient of the torsion spring 9 in the present invention;

[0062] Y is the pressure loss of the valve flap 2 in the present invention, kPa;

[0063] Z is the resistance coefficient of the valve flap 2 in the present invention;

[0064] M is the density of the fluid flowing in the valve body 1, t / m 3 。

[0065] For the plug-in type built-in double-valve-flap check valve, the average flow velocity of different fluids in the valve body 1 can be calculated through the mass influence coefficient of the valve flap 2 in the present invention, the elastic force influence coefficient of the torsion spring 9 in the present invention, the pressure loss of the valve flap 2 in the present invention, the resistance coefficient of the valve flap 2 in the present invention, and the density of the fluid flowing in the valve body 1. According to the calculated average flow velocity, it is compared with the reference flow velocity preset before the manufacture of the check valve of the present invention. According to whether the check valve of the present invention can meet the preset standard comparison, it is judged whether the quality of the present invention meets the standard, and then it is fed back to the production end to adjust the check valve of the present invention, improve the yield rate of the plug-in type built-in double-valve-flap check valve of the present invention, and avoid the problem that the check valve cannot prevent liquid backflow during use; the wear degree of the valve flap 2 and the elastic force loss degree of the torsion spring 9 in the present invention can be reversely judged through the average flow velocity of the fluid in the valve body 1, so as to facilitate the replacement of the valve flap 2 and the torsion spring 9 in the present invention to achieve a good check effect.

[0066] Among them, the mass influence coefficient ∈a of the valve flap 2 is calculated through Formula 2, and Formula 2 is as follows:

[0067]

[0068] Among them, ∈0 is the preset mass reference value of the valve flap 2 in the present invention;

[0069] ∈ is the actual mass value of the valve flap 2 in the present invention;

[0070] As the use time prolongs, due to the continuous impact of the fluid on the valve flap 2, the valve flap 2 will inevitably be worn. As the wear degree of the valve flap 2 increases, its own mass gradually decreases. After the mass is lower than the preset mass value, the water flow pressure required to impact the valve flap 2 to open gradually becomes smaller. Under the same pressure, the water flow velocity will increase.

[0071] Among them, the elastic force influence coefficient of the torsion spring 9 is calculated through Formula 3, and Formula 3 is as follows:

[0072]

[0073] Among them, t0 is the preset elastic force reference value of the torsion spring 9 in the present invention;

[0074] t is the actual elastic force value of the torsion spring 9 in the present invention.

[0075] As the service time prolongs, due to the continuous impact of the fluid on the valve flap 2, the valve flap 2 will inevitably continuously compress the torsion spring 9. As the service time of the torsion spring 9 prolongs, its actual elastic force will continuously weaken, and its actual elastic force value is lower than the preset elastic force reference value of the preset quality value. The water flow pressure required to impact the valve flap 2 to open gradually becomes smaller. Under the same pressure, the water flow velocity will increase. As time prolongs and the actual elastic force of the torsion spring 9 decays, the effect of driving the valve flap 2 to close and check will also become worse, and the problem of backflow is likely to occur. Therefore, when the actual water flow velocity is too fast, it is necessary to overhaul and repair the valve flap 2 and the torsion spring 9 to facilitate the replacement of the valve flap 2 and the torsion spring 9.

[0076] The various embodiments in the specification are described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. The same or similar parts among the various embodiments can be referred to each other. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of this application, several improvements and modifications can also be made to this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

[0077] It should also be noted that in this specification, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

Claims

1. Plug-in type built-in double-flap check valve, characterized in that, Comprising: A valve body (1) with two first keyways and two pin holes inside; Two plug-in brackets (5), the pin shaft heads of the two plug-in brackets (5) are inserted into the two pin holes, and the second keyways on the two plug-in brackets (5) are aligned and arranged inside the two first keyways; Two locking keys (4), each locking key (4) is inserted and cooperated with the combination of the second keyway and the first keyway on the same side to relatively fix the two plug-in brackets (5) and the valve body (1); A valve flap assembly, the valve flap assembly is movably connected between the two plug-in brackets (5) and is sealingly fitted inside the valve body (1); The valve flap assembly includes: a valve flap (2), a rotating shaft (3), a stop shaft (8), and a torsion spring (9); There are two valve flaps (2), and the two valve flaps (2) are sleeved on both sides of the rotating shaft (3); The torsion spring (9) is sleeved on the stop shaft (8), and the two torsion arms of the torsion spring (9) abut against the end faces of the two valve flaps (2) away from the inlet of the valve body (1); Both of the two plug-in brackets (5) are provided with a rotating shaft insertion hole and a stop shaft insertion hole; Both ends of the rotating shaft (3) are inserted and cooperated with the rotating shaft insertion holes of the two plug-in brackets (5), and both ends of the stop shaft (8) are inserted and cooperated with the stop shaft insertion holes of the two plug-in brackets (5); It further includes a valve body maintenance component (11); The valve body maintenance component (11) includes a hinge seat (12), an inclined connecting rod (13), a sliding scraping ring unit (14), a guiding tube unit (15), a compression spring (16), and a fixing ring unit (17); There are two inclined connecting rods (13), one ends of the two inclined connecting rods (13) are relatively rotatably fitted on both sides of the middle of the sliding scraping ring unit (14), and the other ends of the two inclined connecting rods (13) are respectively rotatably connected to a hinge seat (12), and the two hinge seats (12) are relatively fixed on the outer sides of the end faces of the two valve flaps (2) away from the inlet of the valve body (1); The sliding scraping ring unit (14) is slidably fitted on the inner wall of the valve body (1), the sliding scraping ring unit (14) is slidably fitted on the guiding tube unit (15), the middle of the guiding tube unit (15) is threadedly fitted on the fixing ring unit (17), and the fixing ring unit (17) is detachably connected to the inner wall of the valve body (1) near the outlet; The compression spring (16) is sleeved on the guiding tube unit (15) and is located between the sliding scraping ring unit (14) and the fixing ring unit (17); The sliding scraping ring unit (14) includes a fixed scraping ring (141), a movable scraping ring (142), a guide shaft (143), a limiting piece (144) and a return compression spring (145); the fixed scraping ring (141) and the movable scraping ring (142) are both slidably fitted on the inner wall of the valve body (1); the transverse connecting plate in the middle of the fixed scraping ring (141) is slidably fitted on the guide tube unit (15), and the transverse connecting plate in the middle of the fixed scraping ring (141) is rotatably connected to two inclined connecting rods (13); multiple guide shafts (143) are slidably fitted on the fixed scraping ring (141), one ends of the multiple guide shafts (143) are fixed on the movable scraping ring (142), limiting pieces (144) are fixed at the other ends of the multiple guide shafts (143), and return compression springs (145) are sleeved on the shafts of the multiple guide shafts (143) between the movable scraping ring (142) and the fixed scraping ring (141); the movable scraping ring (142) is located between the fixed scraping ring (141) and the valve flap (2). The fixed ring unit (17) includes a fixed ring body (171); the transverse plate in the middle of the fixed ring body (171) is threadedly fitted on the guide tube unit (15). The guide tube unit (15) includes an externally threaded guide tube (151), a limiting retaining ring (152), an annular seat (153), an externally threaded control rod (154), a disc slider (155) and a limiting stop (156); one end of the externally threaded guide tube (151) is fixed with a limiting retaining ring (152), the externally threaded guide tube (151) is slidably fitted on the transverse connecting plate in the middle of the fixed scraping ring (141), the externally threaded guide tube (151) is threadedly fitted on the transverse plate in the middle of the fixed ring body (171), the other end of the externally threaded guide tube (151) is fixedly connected to the annular seat (153), the middle of the externally threaded control rod (154) is rotatably connected to the annular seat (153), one end of the externally threaded control rod (154) is inserted into the externally threaded guide tube (151) and is threadedly fitted with the disc slider (155) sliding in the externally threaded guide tube (151), the two ends of the disc slider (155) are respectively fixed with the inner ends of a limiting stop (156), the middle parts of the two limiting stops (156) slide in the two limiting slideways of the externally threaded guide tube (151), and the outer ends of the two limiting stops (156) are located between the transverse connecting plate of the fixed scraping ring (141) and the transverse plate of the fixed ring body (171) and are located inside the compression spring (16).

2. The plug-in type built-in double-flap check valve according to claim 1, wherein The valve flap assembly further includes a locking nut (7); two locking nuts (7) are threadedly fitted on the retaining shaft (8), and the two locking nuts (7) press against the inner side surfaces of the two locking keys (4).

3. The plug-in type built-in double-flap check valve according to claim 2, characterized in that, The valve flap assembly further includes a locking washer (6), two locking washers (6) are sleeved on the retaining shaft (8), the two locking washers (6) are located outside the two locking nuts (7) and inside the two locking keys (4).

4. The plug-in type built-in double-flap check valve according to claim 3, wherein, Two bendable retaining ears are provided on the locking washer (6), and the two retaining ears resist against the end faces of the locking keys (4) after being bent.

5. The plug-in type built-in double-disc check valve according to claim 3, characterized in that, One end of the stop washer (6) is provided with a bendable edge, and after the bendable edge is bent, it abuts against one side surface of the lock nut (7).

6. The plug-in type built-in double-flap check valve according to claim 1, wherein, A cross bar is provided on the inner circular surface of the valve body (1), and the cross bar abuts against the end faces of the two valve flaps (2) far away from the torsion spring (9); A lifting ring (10) is provided on the outer side surface of the valve body (1).

7. The plug-in type built-in double-disc check valve according to claim 1, characterized in that, Both the first keyway and the second keyway are arc-shaped keyways, and the locking key (4) is an arc-shaped square key.

8. The plug-in type built-in double-flap check valve according to claim 1, wherein, The fixed ring unit (17) further includes: a plug-in slider (172), an unlocking compression spring (173) and an unlocking dial block (174); One plug-in slideway is provided at each end of the fixed ring body (171), and the plug-in slider (172) is slidably fitted in both plug-in slideways. The outer ends of the two plug-in sliders (172) can be plugged into the plug-in slots on the inner wall of the valve body (1). An unlocking dial block (174) is fixed to the inner end of each of the two plug-in sliders (172), and the two unlocking dial blocks (174) slide relatively in the unlocking slideways of the cross plate in the middle of the fixed ring body (171); The outer ends of two unlocking compression springs (173) are respectively fixed to the inner ends of the two unlocking dial blocks (174), and the inner ends of the two unlocking compression springs (173) are fixed to the inner side surfaces of the two unlocking slideways.

9. The plug-in type built-in double-flap check valve according to claim 1, characterized in that, It further includes an overhaul diversion pipe assembly (18); The overhaul diversion pipe assembly (18) includes a horizontal diversion pipe (181), an overhaul end cover (182) and a vertical diversion pipe (183); One end of the horizontal diversion pipe (181) is hermetically connected and communicated with the outlet of the valve body (1), and the other end of the horizontal diversion pipe (181) is detachably and hermetically connected to the overhaul end cover (182); The lower end of the pipe body of the horizontal diversion pipe (181) is fixedly connected and communicated with the vertical diversion pipe (183) provided with a filter screen inside through an outflow port.

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