A marine double plate check valve

Abstract

The present invention relates to the technical field of pipeline valves, and specifically to a marine double-plate check valve, comprising: an inlet pipeline; a valve pipe, fixedly connected to the inlet pipeline, and the valve pipe and the inlet pipeline are coaxially arranged; an outlet pipeline, fixedly connected to the valve pipe, and the inlet pipeline, the valve pipe and the outlet pipeline are coaxially arranged; as the telescopic column is extended, the edge block fixedly connected to the edge block fits with the prismatic groove in the sleeve, and as the edge block moves along the prismatic groove, the edge block pushes the sleeve in the sleeve ring to move, and the moving sleeve controls the rotation of the rotating shaft, thereby adjusting the inclination angle of the baffle and reducing the impact force of the water flow on the baffle. When the water flow in the water inlet pipeline stops flowing, the valve disc is immediately closed, and the edge block is separated from the prismatic groove at this time. At this time, the baffle returns to its original position, thereby increasing the contact area between the baffle and the reverse water flow, reducing the impact force of the water flow on the valve disc, and improving the safety and stability of the device.

Description

Technical Field

[0001] The invention relates to the technical field of pipeline valves, in particular to a marine double-plate check valve. Background Art

[0002] With the development of the shipbuilding industry, more and more valves are widely used in ship piping systems, playing a very important role in the entire ship system. Liquefied natural gas (LNG) ships are special ships designed and built to transport liquefied natural gas at extremely low temperatures of -163°C. Among all current cargo ships, LNG ships have the most complex technology and the highest difficulty. In the ship market, domestic and foreign shipping industries have used more and more LNG ships in recent years. According to the current transportation situation in my country, shipowners pay more and more attention to the safety of LNG ships, and have higher and higher requirements for life, reliability and maintainability.

[0003] The traditional check valve currently used in the cryogenic system of LNG ships adopts a single valve disc. Since the medium flows in one direction at the moment of closing of the double-plate butterfly check valve, as the valve plate closes, the medium quickly drops from the maximum backflow velocity to zero, and the pressure rises rapidly, which produces a "water hammer" phenomenon that may have a destructive effect on the pipeline system. Water hammer is a pressure wave in transient flow in a pressure pipeline. It is a hydraulic impact phenomenon of pressure jump or drop caused by changes in the flow rate of the fluid in the pressure pipeline. The water hammer phenomenon objectively exists in pipelines that transport liquids. It is very destructive and can lead to uneven pressure in the pipeline, causing the pipe to rupture or collapse, and is also destructive to the valve disc and fixings.

[0004] Therefore, it is necessary to provide a marine double-plate check valve to solve the above problems.

[0005] It should be noted that the above information disclosed in this background technology section is only for understanding the background technology of the present application concept, and therefore, it may contain information that does not constitute the prior art. Summary of the invention

[0006] Based on the above problems existing in the prior art, the problem to be solved by the present application is: water hammer is a pressure wave in transient flow in a pressure pipe. It is a hydraulic impact phenomenon of pressure rise or fall caused by changes in the flow rate of the fluid in the pressure pipe. The water hammer phenomenon objectively exists in pipelines for transporting liquids. It is very destructive and can lead to uneven pressure in the pipeline, causing the pipe to rupture or collapse, and is also destructive to valve flaps and fixings.

[0007] The technical solution adopted by the present application to solve the technical problem is: a marine double-plate check valve, comprising:

[0008] Water inlet pipe;

[0009] A valve pipe is fixedly connected to the water inlet pipe, and the valve pipe and the water inlet pipe are coaxially arranged;

[0010] A water outlet pipe is fixedly connected to the valve pipe, and the water inlet pipe, the valve pipe and the water outlet pipe are coaxially arranged;

[0011] A positioning shaft, fixedly disposed in the valve tube;

[0012] A valve flap is rotatably connected to the positioning shaft, and the two valve flaps are mirror-imaged.

[0013] A torsion spring is fixedly arranged on the outer peripheral surface of the positioning shaft, and two ends of the torsion spring are respectively attached to the two valve flaps;

[0014] A buffer device, movably arranged in the water outlet pipe, used to reduce the pressure impact of water flow on the valve disc when the water flow flows back;

[0015] A circular ring, rotatably connected to the inner wall of the water outlet pipe;

[0016] A rotating shaft, rotatably connected to the ring;

[0017] A baffle, fixedly connected to the rotating shaft;

[0018] The transmission mechanism is fixedly arranged between the valve flap and the baffle plate and is used for controlling the inclination angle of the baffle plate.

[0019] Preferably, a regulating valve is fixedly provided on the valve tube, an extrusion column is connected to the inner thread of the regulating valve, and a control valve is fixedly provided on one end of the extrusion column away from the valve tube.

[0020] Preferably, a plurality of anti-slip openings are provided on the outer peripheral surface of the control valve, and the plurality of anti-slip openings are evenly distributed.

[0021] Preferably, the transmission mechanism includes a guide rod fixedly arranged on the valve tube, the guide rod is provided with a guide groove, a slider is slidably arranged in the guide groove, one end of the slider is rotatably connected to the valve disc, a connecting rod is rotatably arranged on the other end of the slider, a telescopic column is fixedly arranged on the guide rod, the telescopic end of the telescopic column is rotatably connected to the connecting rod, a connecting plate is fixedly arranged in the water outlet pipe, a ring is fixedly arranged on the connecting plate, the output end of the telescopic column passes through the ring, the rotating shaft is sleeved on the ring, and a prismatic groove is provided in the ring, and a prismatic block matching the prismatic groove is rotatably arranged on the output end of the telescopic column.

[0022] Preferably, a plurality of sleeves are slidably arranged in the collar, a limiting rod is fixedly arranged in the sleeve, an arc groove is opened on the rotating shaft, and the arc groove is slidably connected to the limiting rod.

[0023] Preferably, a plurality of scrapers are fixedly provided on the circular ring, and the plurality of scrapers are evenly arranged on the circular ring, and the scrapers are in contact with the inner wall of the water outlet pipe.

[0024] Preferably, the scraper is arranged at an angle.

[0025] Preferably, the transverse length of the guide rod is equal to the elongation of the telescopic column, and the width of the edge block is not greater than the groove width of the prismatic groove.

[0026] Preferably, the end of the sleeve is arranged in an arc shape.

[0027] Preferably, two mutually symmetrical water inlets are provided at one end of the valve pipe close to the water inlet pipe, and the areas of the two valve flaps are not less than the area of ​​the water inlets.

[0028] The beneficial effects of the present application are as follows: a marine double-plate check valve provided by the present application, through a valve disc arranged in a valve tube and a guide rod fixedly arranged in the valve tube, realizes that when the staff uses the device, the water pressure generated during the flow of water can squeeze the valve disc rotating on the positioning shaft, and when the valve disc rotates, the valve disc can push the telescopic rod to move through the connecting rod, and as the telescopic column extends, the edge block fixedly connected to the edge block and the prismatic groove in the sleeve fit together, and as the edge block moves along the prismatic groove, the edge block pushes the sleeve in the sleeve ring to move, and the moving sleeve controls the rotation of the rotating shaft, thereby adjusting the inclination angle of the baffle and reducing the impact force of the water flow on the baffle. When the water flow in the water inlet pipe stops inflowing, the valve disc closes immediately, and the edge block disengages from the prismatic groove at this time. At this time, the baffle returns to its original position, increasing the contact area between the baffle and the countercurrent, reducing the impact force of the water flow on the valve disc, and improving the safety and stability of the device.

[0029] In addition to the above-described purposes, features and advantages, the present application also has other purposes, features and advantages. The present application will be further described in detail below with reference to the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0031] Figure 2 It is a schematic diagram of the internal structure of the water outlet pipe of the present invention;

[0032] Figure 3 It is a schematic diagram of the internal structure of the water inlet pipe of the present invention;

[0033] Figure 4 For the present invention Figure 3 The enlarged structural diagram at A in the middle;

[0034] Figure 5 It is a side view structural schematic diagram of the present invention;

[0035] Figure 6 It is a schematic diagram of the ring structure of the present invention;

[0036] Figure 7 For the present invention Figure 6 The enlarged structural diagram at B in the middle;

[0037] Figure 8 It is a schematic diagram of a three-dimensional sleeve of the present invention.

[0038] In the figure: 1. water inlet pipe; 2. valve pipe; 21. positioning shaft; 22. valve disc; 23. torsion spring; 3. buffer device; 31. circular ring; 311. scraper; 32. rotating shaft; 321. arc groove; 33. baffle; 34. transmission mechanism; 341. guide rod; 342. guide groove; 343. slider; 344. connecting rod; 345. telescopic column; 346. collar; 347. prismatic groove; 348. edge block; 4. regulating valve; 41. extrusion column; 42. control valve; 421. anti-slip mouth; 5. sleeve; 51. limit rod; 6. water inlet; 7. water outlet pipe. DETAILED DESCRIPTION

[0039] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0040] In order to enable those skilled in the art to better understand the solution of the present application, the following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of this application.

[0041] Reference Figure 1-3A marine double-plate check valve comprises: an inlet pipe 1; a valve pipe 2, fixedly connected to the inlet pipe 1, and the valve pipe 2 and the inlet pipe 1 are coaxially arranged; an outlet pipe 7, fixedly connected to the valve pipe 2, and the inlet pipe 1, the valve pipe 2 and the outlet pipe 7 are coaxially arranged; a positioning shaft 21, fixedly arranged in the valve pipe 2; a valve flap 22, rotatably connected to the positioning shaft 21, and the two valve flaps 22 are mirror-arranged; a torsion spring 23, fixedly arranged at the positioning shaft 21 On the outer surface, the two ends of the torsion spring 23 are respectively attached to the two valve flaps 22; the buffer device 3 is movably arranged in the water outlet pipe 7, and is used to reduce the pressure impact of the water flow on the valve flap 22 during backflow; the ring 31 is rotatably connected to the inner wall of the water outlet pipe 7; the rotating shaft 32 is rotatably connected to the ring 31; the baffle 33 is fixedly connected to the rotating shaft 32; the transmission mechanism 34 is fixedly arranged between the valve flap 22 and the baffle 33, and is used to control the inclination angle of the baffle 33.

[0042] Reference Figure 2-4 A regulating valve 4 is fixedly arranged on the valve tube 2, and an extrusion column 41 is connected to the inner thread of the regulating valve 4. A control valve 42 is fixedly arranged on the end of the extrusion column 41 away from the valve tube 2. By setting the regulating valve 4 on the valve tube 2, when the staff controls the valve 42 to operate, the staff rotates the regulating valve 4 so that the extrusion column 41 fixedly connected to the regulating valve 4 presses against the valve disc 22 on the valve tube 2, thereby realizing the opening and closing of the control valve 42.

[0043] Reference Figure 1-3 A plurality of anti-slip openings 421 are provided on the outer peripheral surface of the control valve 42, and the plurality of anti-slip openings 421 are evenly distributed. By providing the plurality of anti-slip openings 421 on the control valve 42, the friction between the control valve 42 and the palm of the staff is increased, thereby avoiding the occurrence of slipping of the device during use, and facilitating the stability and safety of the device during use.

[0044] Reference Figure 3-5The transmission mechanism 34 includes a guide rod 341 fixedly arranged on the valve pipe 2, a guide groove 342 is provided on the guide rod 341, a slider 343 is slidably provided in the guide groove 342, one end of the slider 343 is rotatably connected to the valve disc 22, and a connecting rod 344 is rotatably provided on the other end of the slider 343, a telescopic column 345 is fixedly arranged on the guide rod 341, and the telescopic end of the telescopic column 345 is rotatably connected to the connecting rod 344, a connecting plate is fixedly arranged in the water outlet pipe 7, a collar 346 is fixedly arranged on the connecting plate, the output end of the telescopic column 345 passes through the collar 346, the rotating shaft 32 is sleeved on the collar 346, and a prism-shaped The output end of the telescopic column 345 is rotatably provided with a prism block 348 matching the prism groove 347. By providing a guide rod 341 on the valve tube 2 and a guide groove 342 provided on the guide rod 341, when water enters the water inlet pipe 1, the impact force generated by the water flow pushes the valve flap 22 to rotate. When the valve flap 22 opens, it drives the slider 343 movably connected to it to move. At the same time, the moving slider 343 controls the elongation of the telescopic column 345 through the connecting rod 344. As the output end of the telescopic column 345 is elongated, the prism block 348 rotatably provided on its outer circumference is engaged with the prism groove 347, thereby realizing the adjustment of the inclination angle of the baffle 33.

[0045] Reference Figure 3 , 4 and 6, a plurality of sleeves 5 are slidably arranged in the sleeve 346, a limiting rod 51 is fixedly arranged in the sleeve 5, an arc groove 321 is opened on the rotating shaft 32, and the arc groove 321 is slidably connected to the limiting rod 51. By setting the plurality of sleeves 5 in the sleeve 346, it is achieved that when the edge block 348 and the prismatic groove 347 are fitted together, the sleeve 5 can move outward along the side wall of the sleeve 346, and in the process of movement, it moves through the limiting rod 51 inside it and controls the rotation of the rotating shaft 32 through the arc groove 321 on the outer peripheral surface of the rotating shaft 32, thereby achieving the control of the contact angle of the baffle 33 with the flow direction of the water.

[0046] Reference Figure 3 , 6 and 7, a plurality of scrapers 311 are fixedly arranged on the circular ring 31, and the plurality of scrapers 311 are evenly arranged on the circular ring 31, and the scrapers 311 fit the inner wall of the water outlet pipe 7, and the scrapers 311 arranged on the circular ring 31 can drive the scrapers 311 fixedly arranged on the circular ring 31 to rotate as the water flows, and the rotating scrapers 311 can scrape off the impurities and garbage on the inner wall of the water outlet pipe 7, thereby ensuring that the water flow inside the pipe can flow normally.

[0047] Reference Figure 6-8The scraper 311 is inclined. By setting the scraper 311 to be inclined, the angle between the scraper 311 and the inner wall of the pipe is adjusted, so that the scraper 311 can more conveniently scrape and process the impurities and garbage adhering to the outlet pipe 7.

[0048] Reference Figure 1-3 The lateral length of the guide rod 341 is equal to the elongation of the telescopic column 345, and the width of the edge block 348 is not greater than the width of the prismatic groove 347. By controlling the length relationship between the guide rod 341 and the telescopic column 345, it is achieved that when the telescopic column 345 is extended to a certain length, the edge block 348 can be engaged with the prismatic groove 347.

[0049] Reference Figure 6-8 The end of the sleeve 5 is arranged in an arc shape. By arranging the end of the sleeve 5 in an arc shape, the friction between the sleeve 5 and the edge block 348 is reduced, which facilitates the operation of the device.

[0050] Reference Figure 3-5 The valve tube 2 has two symmetrical water inlets 6 at one end close to the water inlet pipe 1, and the areas of the two valve flaps 22 are not less than the area of ​​the water inlet 6. By setting the size relationship between the valve flap 22 and the water inlet 6, it is achieved that when backflow occurs in the pipeline, the valve flap 22 can be completely closed to prevent the backflow of liquid.

[0051] The specific solution is as follows: when using the device, the staff first completes the fixed installation of the device, and through the regulating valve 4 set on the valve pipe 2, when the staff controls the operation of the valve 42, the staff rotates the regulating valve 4, so that the extrusion column 41 fixedly connected to the regulating valve 4 presses against the valve disc 22 on the valve pipe 2, and the control valve 42 is opened and closed. The guide rod 341 on the valve pipe 2 and the guide groove 342 opened on the guide rod 341 are set, so that when water flows into the water inlet pipe 1, the impact force generated by the water flow pushes the valve disc 22 to rotate, and when the valve disc 22 opens, it drives the slider 343 movably connected to it to move, and at the same time, the moving slider 343 controls the elongation of the telescopic column 345 through the connecting rod 344, and as the output end of the telescopic column 345 is elongated and the ridge arranged on the outer circumference thereof is rotated, the telescopic column 345 is elongated. The block 348 is engaged with the prismatic groove 347, thereby realizing the adjustment of the inclination angle of the baffle 33. The multiple sleeves 5 arranged in the ring 346 realize that when the block 348 is in contact with the prismatic groove 347, the sleeve 5 can move outward along the side wall of the ring 346, and in the process of movement, it moves through the internal limit rod 51 and controls the rotation of the rotating shaft 32 through the arc groove 321 on the outer peripheral surface of the rotating shaft 32, thereby realizing the control of the contact angle of the baffle 33 with the flow direction of the water flow. Through the scraper 311 arranged on the circular ring 31, it is realized that as the water flows, the circular ring 31 can drive the scraper 311 fixed on the circular ring 31 to rotate, and the rotating scraper 311 can scrape off the impurities and garbage on the inner wall of the water outlet pipe 7 to ensure that the water flow inside the pipe can flow normally.

[0052] A person skilled in the art should understand that the discussion of any of the above embodiments is only exemplary, and within the spirit of the present invention, the technical features in the above embodiments or in different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity.

[0053] The present invention is intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A marine double-plate check valve, characterized in that: include: Water inlet pipe (1); A valve pipe (2) is fixedly connected to the water inlet pipe (1), and the valve pipe (2) and the water inlet pipe (1) are coaxially arranged; A water outlet pipe (7) is fixedly connected to the valve pipe (2), and the water inlet pipe (1), the valve pipe (2) and the water outlet pipe (7) are coaxially arranged; A positioning shaft (21) fixedly disposed in the valve tube (2); A valve flap (22) is rotatably connected to the positioning shaft (21), and the two valve flaps (22) are mirror-imaged; A torsion spring (23) is fixedly arranged on the outer peripheral surface of the positioning shaft (21), and two ends of the torsion spring (23) are respectively attached to the two valve flaps (22); A buffer device (3) movably arranged in the water outlet pipe (7) and used to reduce the pressure impact on the valve disc (22) caused by the water flow when it flows back; A circular ring (31) rotatably connected to the inner wall of the water outlet pipe (7); A rotating shaft (32) rotatably connected to the ring (31); A baffle (33) fixedly connected to the rotating shaft (32); A transmission mechanism (34) is fixedly arranged between the valve flap (22) and the baffle plate (33) and is used to control the inclination angle of the baffle plate (33); The transmission mechanism (34) comprises a guide rod (341) fixedly arranged on the valve tube (2), a guide groove (342) being provided on the guide rod (341), a slider (343) being slidably arranged in the guide groove (342), one end of the slider (343) being rotatably connected to the valve flap (22), a connecting rod (344) being rotatably arranged on the other end of the slider (343), a telescopic column (345) being fixedly arranged on the guide rod (341), and the telescopic column (345) ) is rotatably connected between the telescopic end of the telescopic column (345) and the connecting rod (344), a connecting plate is fixedly arranged in the water outlet pipe (7), a collar (346) is fixedly arranged on the connecting plate, an output end of the telescopic column (345) passes through the collar (346), the rotating shaft (32) is sleeved on the collar (346), a prismatic groove (347) is provided in the collar (346), and a prismatic block (348) matching the prismatic groove (347) is rotatably arranged on the output end of the telescopic column (345); A plurality of sleeves (5) are slidably disposed in the sleeve ring (346), a limiting rod (51) is fixedly disposed in the sleeve (5), an arc-shaped groove (321) is formed on the rotating shaft (32), and the arc-shaped groove (321) is slidably connected to the limiting rod (51); The lateral length of the guide rod (341) is equal to the elongation of the telescopic column (345), and the width of the edge block (348) is not greater than the width of the prismatic groove (347); The end of the sleeve (5) is arranged in an arc shape.

2. A marine double-plate check valve according to claim 1, characterized in that: A regulating valve (4) is fixedly arranged on the valve tube (2), an extrusion column (41) is internally threadedly connected to the regulating valve (4), and a control valve (42) is fixedly arranged on one end of the extrusion column (41) away from the valve tube (2).

3. A marine double-plate check valve according to claim 2, characterized in that: A plurality of anti-slip openings (421) are provided on the outer peripheral surface of the control valve (42), and the plurality of anti-slip openings (421) are evenly distributed.

4. A marine double-plate check valve according to claim 1, characterized in that: A plurality of scrapers (311) are fixedly arranged on the circular ring (31), and the plurality of scrapers (311) are evenly arranged on the circular ring (31), and the scrapers (311) are in contact with the inner wall of the water outlet pipe (7).

5. A marine double plate check valve according to claim 4, characterized in that: The scraper (311) is arranged in an inclined manner.

6. A marine double plate check valve according to claim 1, characterized in that: Two mutually symmetrical water inlets (6) are provided at one end of the valve tube (2) close to the water inlet pipe (1), and the areas of the two valve flaps (22) are not less than the area of ​​the water inlets (6).

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