Double check valve

Abstract

The double check valve comprises a valve seat and a valve deck, a control part comprises a valve plate and a sealing gasket, a feedback part comprises a vertical groove formed in the valve plate, a transverse groove communicated with the vertical groove is formed in the valve plate, a feedback plate is slidably connected into the transverse groove, a cleaning part comprises a cylinder, the cylinder corresponds to the valve deck, and the sealing gasket is arranged on the valve deck. The cylinder is rotationally connected with the valve seat, a plurality of scraping plates which are uniformly distributed in the circumferential direction are slidably connected into the cylinder, and when one valve plate leaks, the corresponding scraping plates can scrape impurities on the corresponding sealing gaskets, so that the local leakage condition of the valve body is accurately identified, and the leakage detection accuracy is improved. And according to the corresponding leakage condition of the valve plate, corresponding impurities are scraped in a targeted mode, and the stability of the check valve in the long-time continuous operation process is improved to a great extent.

Description

Technical Field

[0001] The present invention relates to the technical field of check valves, and more particularly to a double check valve. Background Art

[0002] A check valve is a valve that automatically opens and closes the valve plate by relying on the flow of the medium itself to prevent the medium from flowing back. It only allows the medium to flow in one direction. When the medium flows in the specified direction, the valve plate opens under the action of the medium pressure, and the medium passes smoothly. When the medium tries to flow in the opposite direction, the valve plate will quickly close under the action of the medium pressure and its own gravity to prevent the medium from flowing back, thereby ensuring the unidirectional flow of the medium in the pipeline system and avoiding a series of problems caused by the backflow of the medium, such as damage to equipment, affecting the normal operation of the system, and causing safety accidents.

[0003] For example, a Chinese patent document with application number 202410924578.X discloses a large-diameter high-pressure check valve with a buffer device, comprising a valve body, an inlet, an outlet and a valve plate arranged on the check valve body, wherein the inner side wall of the valve body is fixedly connected to two symmetrically arranged fixed blocks. When the pump is shut down or the main valve is closed, this large-diameter high-pressure check valve with a buffer device can buffer the medium in the inlet, ensure the closing effect of the valve plate and avoid damage to it due to impact, thereby ensuring its use effect and lifespan, and can automatically detect when the valve plate is worn or foreign matter is adhered, and remind the operator to clean or replace the valve plate, thereby ensuring the use effect of the check valve body.

[0004] The invention has the function of detecting foreign matter and impurities in the valve body, but currently it can only realize sending reminders to the operator. The impurities in the valve body still remain after the detection. The operator needs to disassemble the valve body and manually complete the cleaning or replacement of parts. In the prior art, the double check valve is composed of two check valves in series to achieve double non-return protection, but as the medium continues to impact, the valve plate in the check valve opens and closes frequently. Once the medium flow rate slows down and the valve plate approaches the closed state, the impurities carried by the medium are easily retained in the gap between the sealing gasket and the valve plate, thereby having a negative impact on the non-return effect of the check valve. Even if the double check valve design leaks when one of them occurs, the other can still maintain operation, but at this time the leaking check valve has failed and urgently needs to be repaired and cleaned. However, the prior art requires disassembling the check valve for cleaning or replacement. This process is not only time-consuming and labor-intensive, but also interferes with the normal operation of the pipeline. In view of the repeated breeding and continuous residue of impurities between the sealing gasket and the valve plate, it is not practical to use manual disassembly to clean. Summary of the invention

[0005] In order to overcome the above defects of the prior art, the present invention provides a double check valve to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: it includes a valve seat and two valve covers, and also includes: a control part, the control part includes two valve plates and two sealing gaskets, the valve plate and the sealing gasket can control the opening and closing of the valve seat; a feedback part, the feedback part includes a vertical groove opened on the valve plate, the valve plate is provided with a horizontal groove connected to the vertical groove, a feedback plate is slidably connected in the horizontal groove, when the valve plate near the inlet end leaks, the feedback plate near the outlet end can move, when the valve plate near the outlet end leaks, the feedback plate near the inlet end can move; a cleaning part, the cleaning part includes two cylinders, the cylinder corresponds to the valve cover, the cylinder is rotatably connected to the valve seat, a plurality of scraping plates evenly distributed along the circumferential direction are slidably connected in the cylinder, when one of the valve plates leaks, the corresponding plurality of scraping plates can scrape impurities on the corresponding sealing gasket.

[0007] Preferably, the sealing gasket corresponds to the valve plate, the top of the valve plate is slidably connected to the sliding cylinder through a sliding rod, the top of the sliding cylinder is fixedly connected to the bottom of the valve cover, a first elastic member is sleeved on the sliding rod, the top of the first elastic member is connected to the sliding cylinder, and the bottom of the first elastic member is connected to the valve plate.

[0008] Preferably, a pressure plate is slidably connected in the vertical groove near the inlet end, a second elastic member is connected to the bottom of the pressure plate, the second elastic member is connected to the bottom of the vertical groove, and one end of each feedback plate near the inlet is connected to the side wall of the horizontal groove via a third elastic member.

[0009] Preferably, two support plates corresponding to the valve plates are provided in the valve seat, each of the support plates is slidably connected with a guide plate, a slot with an opening facing the feedback plate is provided on the top of each guide plate, and the bottom of the feedback plate can be inserted into the corresponding slot, a guide groove is provided on each guide plate, and a guide cylinder is slidably connected to each valve cover, the tops of the two guide cylinders respectively penetrate the valve cover and are fixedly connected by a connecting rod, a lifting rod is slidably connected in the two guide cylinders, and the top of the lifting rod penetrates the valve cover.

[0010] Preferably, a first plug is provided on the outer wall of the guide cylinder near the inlet, and the first plug is inserted into the corresponding guide groove. A second plug is provided on the outer wall of the lifting rod near the outlet end, and a clearance groove is opened on the guide cylinder near the outlet end. The free end of the second plug extends out of the clearance groove, and the free end of the second plug is inserted into the corresponding guide groove. A baffle is provided at one end of each support plate near the inlet, and the end of the baffle near the outlet is connected to the guide plate via a fourth elastic member.

[0011] Preferably, two lifting rings are slidably connected in the valve seat, the lifting rings correspond to the cylinders, the lifting rings are located below the corresponding cylinders, and each lifting ring is fixedly connected to a connecting plate, the connecting plate close to the inlet is fixedly connected to the lifting rod, and the connecting plate close to the outlet is fixedly connected to the guide cylinder.

[0012] Preferably, the side of the scraper plate close to the sealing gasket is an inclined surface, and the end of each scraper plate away from the sealing gasket is connected to a fifth elastic member, and the end of each fifth elastic member away from the sealing gasket is connected to the side wall of the cylinder.

[0013] Preferably, each of the scraping plates is provided with a contact groove opening toward the lifting plate, and a plurality of lifting plates are slidably connected to the lifting ring, and the plurality of lifting plates correspond one-to-one to the plurality of scraping plates, and the top of the lifting plate passes through the corresponding cylinder, and the top of the lifting plate is inserted into the corresponding contact groove.

[0014] Preferably, the side of the contact groove close to the sealing gasket is an inclined surface, and the top of the lifting plate is an inclined surface. When the lifting plate moves toward the scraper plate, the lifting plate can push the corresponding scraper plate to move toward the sealing gasket.

[0015] Preferably, a spiral groove is formed on the inner arc surface of each cylinder, a vertical rod is fixedly connected to the top of each lifting ring, a guide column is fixedly connected to each vertical rod, and the guide column is inserted into the corresponding spiral groove.

[0016] Technical effects and advantages of the present invention: 1. The present invention realizes accurate identification of local leakage of the valve body through the coordinated arrangement of the valve seat, valve plate, vertical groove, horizontal groove, feedback plate, guide plate, guide groove, guide cylinder and lifting rod. The feedback plate is responsible for detecting the sealing state between adjacent valve plates and sealing gaskets and making targeted feedback, and can accurately judge the leakage of a specific valve plate. At the same time, it can also promptly detect the impurities remaining in the check valve and respond quickly. When the valve plate near the inlet end leaks, the lifting rod will feedback by moving up and down, and when the valve plate near the outlet end leaks, the guide cylinder will feedback by moving up and down.

[0017] 2. The present invention realizes the function of automatically scraping away impurities between the valve plate and the sealing gasket through the coordinated arrangement of the lifting ring, the lifting plate, the cylinder, the scraping plate, the contact plate and the fifth elastic member. When leakage occurs between the valve plate and the sealing gasket near the inlet end, the lifting plate near the outlet end can keenly identify the leakage and provide timely feedback. Based on the feedback, the lifting rod will drive the cleaning part located at the inlet end to carry out impurity removal and cleaning work on the sealing gasket at the inlet end. When leakage occurs between the valve plate and the sealing gasket near the outlet end, the guide cylinder near the inlet end can accurately identify the leakage and drive the cleaning part at the outlet end to clean the impurities on the sealing gasket at the outlet end. This automated impurity removal process does not require an additional power source, effectively avoids the tedious process of manual disassembly and cleaning, improves work efficiency, and at the same time greatly enhances the stability of the check valve during long-term continuous operation.

[0018] 3. The present invention can drive the cylinder to drive multiple scraping plates to move toward the direction of the sealing gasket through the coordinated arrangement of the lifting ring, the cylinder, the spiral groove, the vertical rod and the guide column. At the same time, the scraping plate will twist. In this process, the scraping plate continuously changes the direction of force application, and achieves a better scraping effect by virtue of the multi-directional force change. In addition, the cleaning radius of the scraping plate is increased, which effectively avoids the occurrence of scraping dead corners on the sealing gasket. After such efficient cleaning, the sealing performance between the valve plate and the sealing gasket is significantly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a full cutaway front view of the present invention; Figure 3 For the present invention Figure 2 A magnified view of middle; Figure 4 An exploded view of the cleaning portion of the present invention; Figure 5 It is a structural schematic diagram of the valve plate and the guide plate near the inlet end of the present invention; Figure 6 It is a structural schematic diagram of the valve plate and the guide plate near the outlet end of the present invention; Figure 7 It is a schematic diagram of the structure of the guide cylinder, lifting rod and guide plate of the present invention; Figure 8 For the present invention Figure 7 Enlarged view of middle B; Fig. 9 For the present invention Figure 7 Enlarged view of C in the middle.

[0020] The accompanying drawings are marked as follows: 1, valve seat; 2, valve cover; 3, control part; 31, valve plate; 32, sealing gasket; 33, slide rod; 34, slide cylinder; 35, first elastic member; 4, feedback part; 41, vertical groove; 42, horizontal groove; 43, feedback plate; 44, pressure plate; 45, second elastic member; 46, third elastic member; 47, support plate; 48, guide plate; 49, slot; 410, guide groove; 411, Guide cylinder; 412, connecting rod; 413, lifting rod; 414, first plug post; 415, second plug post; 416, baffle; 417, fourth elastic member; 418, clearance groove; 5, cleaning part; 51, cylinder; 52, scraper plate; 53, lifting ring; 54, connecting plate; 55, fifth elastic member; 56, contact groove; 57, lifting plate; 58, spiral groove; 59, vertical rod; 510, guide column. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0022] Embodiment 1 In a double check valve pipeline system, two check valves are arranged in series, one close to the inlet end and the other close to the outlet end. Under normal circumstances, even if one of the check valves leaks due to impurities between the valve plate and the sealing gasket, the entire double check valve pipeline can still maintain the non-return function. In the prior art, leakage detection of double check valves can only be judged at the overall level, that is, only when the two check valves fail at the same time can the leakage of the check valve be detected. However, when one of the check valves fails and the other is still working normally, the prior art cannot identify this local failure state. If the system is in this unrecognized local failure state for a long time, it will cause pressure fluctuations. In particular, when the medium flows back, it will break the originally stable pressure balance of the system, causing the pressure to drop instantly or fluctuate violently, thereby seriously affecting the normal operation of the system.

[0023] To solve the above technical problems, please refer to Figures 1 to 9 As shown, the first embodiment of the present invention provides a double check valve, including a valve seat 1 and two valve covers 2 , as well as a control part 3 , a feedback part 4 and a cleaning part 5 .

[0024] The control part 3 includes two valve plates 31 and two sealing gaskets 32. The valve plates 31 and the sealing gaskets 32 can control the opening and closing of the valve seat 1. The feedback part 4 includes a vertical groove 41 opened on the valve plate 31. The valve plate 31 is provided with a horizontal groove 42 connected to the vertical groove 41. A feedback plate 43 is slidably connected in the horizontal groove 42. When the valve plate 31 near the inlet end leaks, the feedback plate 43 near the outlet end can move. When the valve plate 31 near the outlet end leaks, the feedback plate 43 near the inlet end can move. The cleaning part 5 includes two cylinders 51. The cylinder 51 corresponds to the valve cover 2. The cylinder 51 is rotatably connected to the valve seat 1. A plurality of scraping plates 52 uniformly distributed along the circumferential direction are slidably connected in the cylinder 51. When one of the valve plates 31 leaks, the corresponding plurality of scraping plates 52 can scrape impurities on the corresponding sealing gasket 32.

[0025] The valve plate 31 corresponds to the valve cover 2, the sealing gasket 32 ​​corresponds to the valve plate 31, the top of the valve plate 31 is slidably connected to the slide cylinder 34 through the slide rod 33, the top of the slide cylinder 34 is fixedly connected to the bottom of the valve cover 2, and a first elastic member 35 is sleeved on the slide rod 33. The first elastic member 35 is a spring. The top of the first elastic member 35 is connected to the slide cylinder 34, and the bottom of the first elastic member 35 is connected to the valve plate 31.

[0026] A pressure plate 44 is slidably connected in the vertical groove 41 near the inlet end, and a second elastic member 45 is connected to the bottom of the pressure plate 44, and the second elastic member 45 is a spring. The second elastic member 45 is connected to the bottom of the vertical groove 41, and one end of each feedback plate 43 near the inlet is connected to the side wall of the horizontal groove 42 through a third elastic member 46, and the third elastic member 46 is a spring.

[0027] Two support plates 47 corresponding to the valve plate 31 are provided in the valve seat 1, and a guide plate 48 is slidably connected to each support plate 47. A slot 49 with an opening facing the feedback plate 43 is provided on the top of each guide plate 48, and the bottom of the feedback plate 43 can be inserted into the corresponding slot 49. A guide groove 410 is provided on each guide plate 48, and the shape of the guide groove 410 is an inverted V shape. A guide cylinder 411 is slidably connected to each valve cover 2, and the tops of the two guide cylinders 411 respectively penetrate the valve cover 2 and are fixedly connected by a connecting rod 412. A lifting rod 413 is slidably connected in the two guide cylinders 411, and the top of the lifting rod 413 penetrates the valve cover 2, and the lifting rod 413 is set in an inverted U shape.

[0028] A first plug post 414 is provided on the outer wall of the guide cylinder 411 near the inlet, and the first plug post 414 is inserted into the corresponding guide groove 410. A second plug post 415 is provided on the outer wall of the lifting rod 413 near the outlet end, and a clearance groove 418 is opened on the guide cylinder 411 near the outlet end. The free end of the second plug post 415 extends out of the clearance groove 418, and the free end of the second plug post 415 is inserted into the corresponding guide groove 410. When the guide plate 48 drives the guide groove 410 to move, the first plug post 414 or the second plug post 415 can move up and down as the corresponding guide groove 410 moves left and right. The baffle plate 416 is provided at one end of each support plate 47 near the inlet, and the end of the baffle plate 416 near the outlet is connected to the guide plate 48 via a fourth elastic member 417. The fourth elastic member 417 is a spring. When the feedback plate 43 near the inlet end is displaced, the feedback plate 43 near the inlet end drives the guide plate 48 near the inlet end to move, and the guide cylinder 411 moves in the vertical direction. When the feedback plate 43 near the outlet end is displaced, the feedback plate 43 near the outlet end drives the guide plate 48 near the outlet end to move, and the lifting rod 413 moves in the vertical direction.

[0029] During operation, the medium in the pipeline flows from the inlet end to the outlet end, and the medium flows from left to right. When the medium flows normally, it will push the two valve plates 31 to move upward respectively. The valve plate 31 drives the slide rod 33 to move upward in the slide cylinder 34 and compresses the first elastic member 35, so that the valve seat 1 is in an open state. The medium passes through the valve seat 1 from left to right. When the medium at the inlet end gradually stops flowing, the pressure of the medium impacting the valve plate 31 decreases, and the valve plate 31 moves downward under the action of the first elastic member 35. Therefore, the medium flows slowly at this time. At this time, impurities in the medium are very likely to remain between the sealing gasket 32 ​​and the valve plate 31. When the valve plate 31 is pressed against the sealing gasket 32 ​​under the action of the first elastic member 35, the remaining impurities will affect the non-return effect of the valve seat 1.

[0030] When leakage occurs between the valve plate 31 on the left and the sealing gasket 32 ​​due to excessive impurities, the valve plate 31 on the right can still play a non-return effect with the corresponding sealing gasket 32. When the medium on the right flows back, the medium enters the vertical groove 41 on the right, and the medium flows into the horizontal groove 42 through the vertical groove 41. At this time, the valve plate 31 on the left leaks, and the feedback plate 43 on the right moves to the left under the push of the reflux medium at the outlet end. At this time, the feedback plate 43 on the right can push the medium between the two valve plates 31 to move to the left. (On the contrary, when there is no leakage on the valve plate 31 on the left, the feedback plate 43 on the right cannot push the medium to move, and the feedback plate 43 cannot move. When the valve plate 31 on the left leaks, the feedback plate 43 on the right can move to the left. When the sealing effect of the valve plate 31 on the left side is good, the feedback plate 43 on the right side cannot move to the left). The feedback plate 43 on the right side moves to the left and compresses the third elastic member 46. The feedback plate 43 on the right side drives the guide plate 48 to move to the left and compresses the fourth elastic member 417 through the card slot 49, so that the guide plate 48 on the right side drives the guide groove 410 to move to the left, and the second plug post 415 moves in the vertical direction under the push of the inclined surface of the guide groove 410. When the guide plate 48 on the right side drives the guide groove 410 to move to the left to the extreme position, the second plug post 415 on the right side drives the lifting rod 413 to complete an up and down reciprocating movement, and the up and down movement of the lifting rod 413 is used to feedback the leakage of the valve plate 31 near the inlet end.

[0031] When leakage occurs between the valve plate 31 and the sealing gasket 32 ​​on the right side due to excessive impurities, the valve plate 31 on the left side can still play a check effect with the corresponding sealing gasket 32. When the medium on the right side flows back, the medium enters the area between the two valve plates 31 through the gap between the valve plate 31 and the sealing gasket 32 ​​on the right side, so that the pressure of the medium in the area between the two valve plates 31 gradually increases, and the medium flows into the vertical groove 41 on the left side. As the pressure of the medium gradually increases, the pressure plate 44 gradually moves downward and compresses the third elastic member 46, so that the vertical groove 41 on the left side is connected with the horizontal groove 42 on the left side, and the medium enters the left vertical groove 41. In the horizontal groove 42 on the side, the medium pushes the feedback plate 43 on the left to move leftward, and the feedback plate 43 on the left drives the guide plate 48 on the left to move leftward through the slot 49, and the guide plate 48 on the left drives the guide groove 410 on the left to move leftward, so that the first plug column 414 moves in the vertical direction under the push of the inclined surface of the guide groove 410. When the guide plate 48 on the left drives the guide groove 410 to move to the left to the extreme position, the first plug column 414 drives the guide cylinder 411 to complete an up and down reciprocating movement, and the up and down movement of the guide cylinder 411 is used to feedback the leakage of the valve plate 31 on the right side near the outlet end.

[0032] When the valve plate 31 opens upward under the impact of the medium, the valve plate 31 drives the feedback plate 43 to separate from the guide plate 48, and the guide plate 48 is reset under the action of the fourth elastic member 417, and the feedback plate 43 is reset under the action of the third elastic member 46. When the valve plate 31 is closed again, the valve plate 31 drives the feedback plate 43 to be inserted into the slot 49 of the guide plate 48. In summary, the left and right feedback plates 43 can detect the sealing conditions of adjacent valve plates 31 according to the local leakage in the valve seat 1, and make targeted feedback, accurately identify the leakage of a specific valve plate 31, and can timely identify and respond to impurities remaining in the valve seat 1.

[0033] Embodiment 2 Based on the above embodiments, when one of the check valves fails, it can be identified. However, in the prior art, when impurities appear between the valve plate and the sealing gasket in the check valve, it can only be used to remind the operator. The impurities in the valve body still remain after detection, and the valve body cannot be self-cleaned internally. The operator is required to disassemble the valve body and manually complete cleaning or replacement of parts. This process is not only time-consuming and labor-intensive, but also interferes with the normal operation of the pipeline. Moreover, due to the repeated growth of impurities and their continued residue between the sealing gasket and the valve plate, the long-term stable operation of the check valve cannot be guaranteed.

[0034] See also Figures 1 to 9 As shown, two lifting rings 53 are slidably connected inside the valve seat 1, the lifting rings 53 correspond to the cylinder 51, and the lifting rings 53 are located below the corresponding cylinder 51. A connecting plate 54 is fixedly connected to each lifting ring 53, the connecting plate 54 near the inlet is fixedly connected to the lifting rod 413, and the connecting plate 54 near the outlet is fixedly connected to the guide cylinder 411.

[0035] The scraper plate 52 has an inclined surface on one side close to the sealing gasket 32. Figure 3 The scraper plate 52 is in an inclined state with the left side higher and the right side lower. When the scraper plate 52 moves toward the sealing gasket 32, the scraper plate 52 pushes the sealing gasket 32 ​​downward for compression through the inclined surface. Each scraper plate 52 is connected to a fifth elastic member 55 at one end away from the sealing gasket 32. The fifth elastic member 55 is a spring. Each fifth elastic member 55 is connected to the side wall of the cylinder 51 at one end away from the sealing gasket 32.

[0036] Each scraper plate 52 is provided with a contact groove 56 opening toward the lifting plate 57. A plurality of lifting plates 57 are slidably connected to the lifting ring 53. The plurality of lifting plates 57 correspond one-to-one to the plurality of scraper plates 52. The top of the lifting plate 57 passes through the corresponding cylinder 51, and the top of the lifting plate 57 is inserted into the corresponding contact groove 56.

[0037] The side of the contact groove 56 close to the sealing gasket 32 ​​is an inclined surface. Figure 3The top of the lifting plate 57 is an inclined surface, and the inclined surface of the lifting plate 57 is Figure 3 The middle is in an inclined state with the left side lower and the right side higher. When the lifting plate 57 moves toward the scraping plate 52 , the lifting plate 57 can push the corresponding scraping plate 52 to move toward the sealing pad 32 .

[0038] On the basis of the above embodiment, when leakage occurs between the valve plate 31 on the left and the sealing gasket 32 ​​on the left, the lifting rod 413 will move back and forth up and down. When the lifting rod 413 moves upward, the lifting rod 413 drives the lifting ring 53 on the left to move upward through the connecting plate 54 on the left. The lifting ring 53 on the left drives multiple lifting plates 57 to move upward. The top of the lifting plate 57 is inserted into the corresponding contact groove 56. During the upward movement of the lifting plate 57, the corresponding scraper plate 52 is pushed to move toward the direction of the sealing gasket 32 ​​and stretch the fifth elastic member 55. The side of the scraper plate 52 close to the sealing gasket 32 ​​is an inclined surface, and the sealing gasket 32 ​​has a certain elasticity. In the process of moving toward the sealing gasket 32, the scraper plate 52 The sealing gasket 32 ​​is pressed down by its inclined surface to form a certain space between the sealing gasket 32 ​​and the valve plate 31. The scraper plate 52 moves further toward the sealing gasket 32 ​​to scrape off the impurities on the sealing gasket 32 ​​on the left side, so that the impurities are pushed away and the impurities between the valve plate 31 on the left side and the sealing gasket 32 ​​are scraped off. When the lifting rod 413 moves downward, the lifting rod 413 drives the lifting ring 53 on the left side to move downward via the connecting plate 54 on the left side, and the lifting ring 53 on the left side drives the multiple lifting plates 57 to move downward. The multiple scraper plates 52 are reset under the action of the fifth elastic member 55, so that the multiple scraper plates 52 are moved into the cylinder 51 on the left side, completing the scraping operation of the impurities between the valve plate 31 on the left side and the sealing gasket 32.

[0039] When leakage occurs between the right valve plate 31 and the right sealing gasket 32, the guide cylinder 411 will reciprocate up and down. When the guide cylinder 411 moves upward, the left guide cylinder 411 drives the right guide cylinder 411 to move upward synchronously through the connecting rod 412. The right guide cylinder 411 drives the right lifting ring 53 to move upward through the right connecting plate 54. The right lifting ring 53 drives multiple lifting plates 57 to move upward. The top of the lifting plate 57 is inserted into the corresponding contact groove 56. During the upward movement of the lifting plate 57, the corresponding scraper plate 52 is pushed to move toward the direction of the sealing gasket 32 ​​and stretch the fifth elastic member 5. 5, the scraper plate 52 further moves toward the sealing gasket 32 ​​to scrape off the impurities on the right sealing gasket 32, so that the impurities are pushed away, and the impurities between the right valve plate 31 and the sealing gasket 32 ​​are scraped off. When the right guide cylinder 411 moves downward, the guide cylinder 411 drives the right lifting ring 53 to move downward through the right connecting plate 54, and the right lifting ring 53 drives the multiple lifting plates 57 to move downward. The multiple scraper plates 52 are reset under the action of the fifth elastic member 55, so that the multiple scraper plates 52 move into the right cylinder 51, and the scraping operation of the impurities between the right valve plate 31 and the sealing gasket 32 ​​is completed.

[0040] Embodiment 3 On the basis of the above-mentioned embodiment, in the circular container, a plurality of scraping plates are evenly distributed along the circumferential direction. However, there are scraping gaps between these scraping plates, and the sealing gasket used is annular. When the plurality of scraping plates move toward the sealing gasket, although they can play a certain scraping effect, there will inevitably be scraping dead corners. Therefore, impurities will always remain on the sealing gasket. In addition, if the scraping plate only scrapes horizontally in a single direction, the force direction is fixed and unchanged. This single force application method is difficult to achieve an ideal scraping effect on impurities.

[0041] See also Figure 3 and Figure 4 As shown, a spiral groove 58 is opened on the inner arc surface of each cylinder 51 , a vertical rod 59 is fixedly connected to the top of each lifting ring 53 , and a guide column 510 is fixedly connected to each vertical rod 59 , and the guide column 510 is inserted into the corresponding spiral groove 58 .

[0042] On the basis of the above-mentioned embodiment 2, when the lifting ring 53 moves upward, the lifting ring 53 drives the vertical rod 59 to move upward. Since the lifting rod 413 moves upward relative to the cylinder 51, the vertical rod 59 drives the guide column 510 to move upward in the spiral groove 58. The cylinder 51 rotates as a whole under the joint action of the guide column 510 and the spiral groove 58. When the multiple scraping plates 52 are moving toward the sealing gasket 32 ​​to scrape impurities, the cylinder 51 drives the multiple scraping plates 52 to move toward the sealing gasket 32 ​​and twist at the same time, so that the scraping plates 52 constantly change the force direction. By changing the force direction, a better scraping effect is achieved. At the same time, the cleaning radius of the scraping plate 52 is increased to avoid the existence of scraping dead corners on the sealing gasket 32, so that the sealing effect between the cleaned valve plate 31 and the sealing gasket 32 ​​is better.

[0043] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A double check valve, comprising a valve seat and two valve covers, characterized in that: Also includes: A control unit, the control unit comprising two valve plates and two sealing pads, the valve plates and the sealing pads being capable of controlling the opening and closing of the valve seat; A feedback part, wherein the feedback part comprises a vertical groove formed on the valve plate, a horizontal groove connected to the vertical groove formed on the valve plate, a feedback plate slidably connected in the horizontal groove, and when the valve plate near the inlet end leaks, the feedback plate near the outlet end can move, and when the valve plate near the outlet end leaks, the feedback plate near the inlet end can move; The cleaning part includes two cylinders, the cylinders correspond to the valve covers, the cylinders are rotatably connected to the valve seats, and a plurality of scraping plates evenly distributed along the circumferential direction are slidably connected inside the cylinders. When one of the valve plates leaks, the corresponding plurality of scraping plates can scrape off impurities on the corresponding sealing gasket.

2. The double check valve according to claim 1, characterized in that: The valve plate corresponds to the valve cover, the sealing gasket corresponds to the valve plate, the top of the valve plate is slidably connected to the sliding cylinder through a sliding rod, the top of the sliding cylinder is fixedly connected to the bottom of the valve cover, a first elastic member is sleeved on the sliding rod, the top of the first elastic member is connected to the sliding cylinder, and the bottom of the first elastic member is connected to the valve plate.

3. The double check valve according to claim 2, characterized in that: A pressure plate is slidably connected in the vertical groove near the inlet end, a second elastic member is connected to the bottom of the pressure plate, the second elastic member is connected to the bottom of the vertical groove, and one end of each feedback plate near the inlet is connected to the side wall of the horizontal groove via a third elastic member.

4. The double check valve according to claim 3, characterized in that: Two support plates corresponding to the valve plates are arranged in the valve seat, and a guide plate is slidably connected to each of the support plates. A slot opening toward the feedback plate is provided on the top of each guide plate, and the bottom of the feedback plate can be inserted into the corresponding slot. A guide groove is provided on each guide plate, and a guide cylinder is slidably connected to each valve cover. The tops of the two guide cylinders respectively penetrate the valve cover and are fixedly connected by a connecting rod. A lifting rod is slidably connected to the two guide cylinders, and the top of the lifting rod penetrates the valve cover.

5. The double check valve according to claim 4, characterized in that: A first plug is provided on the outer wall of the guide cylinder near the inlet, and the first plug is inserted into the corresponding guide groove. A second plug is provided on the outer wall of the lifting rod near the outlet end, and a yield groove is opened on the guide cylinder near the outlet end. The free end of the second plug extends out of the yield groove, and the free end of the second plug is inserted into the corresponding guide groove. A baffle is provided at one end of each support plate near the inlet, and the end of the baffle near the outlet is connected to the guide plate via a fourth elastic member.

6. The double check valve according to claim 5, characterized in that: Two lifting rings are slidably connected in the valve seat, the lifting rings correspond to the cylinders, and the lifting rings are located below the corresponding cylinders. A connecting plate is fixedly connected to each of the lifting rings, the connecting plate close to the inlet is fixedly connected to the lifting rod, and the connecting plate close to the outlet is fixedly connected to the guide cylinder.

7. The double check valve according to claim 6, characterized in that: The side of the scraper plate close to the sealing gasket is an inclined surface, and the end of each scraper plate away from the sealing gasket is connected to the fifth elastic member, and the end of each fifth elastic member away from the sealing gasket is connected to the side wall of the cylinder.

8. The double check valve according to claim 7, characterized in that: Each of the scraping plates is provided with a contact groove opening toward the lifting plate, and a plurality of lifting plates are slidably connected to the lifting ring. The plurality of lifting plates correspond one to one with the plurality of scraping plates, and the top of the lifting plate passes through the corresponding cylinder, and the top of the lifting plate is inserted into the corresponding contact groove.

9. The double check valve according to claim 8, characterized in that: The side of the contact groove close to the sealing gasket is an inclined surface, and the top of the lifting plate is an inclined surface. When the lifting plate moves toward the scraping plate, the lifting plate can push the corresponding scraping plate to move toward the sealing gasket.

10. The double check valve according to claim 9, characterized in that: A spiral groove is provided on the inner arc surface of each cylinder, a vertical rod is fixedly connected to the top of each lifting ring, and a guide column is fixedly connected to each vertical rod, and the guide column is inserted into the corresponding spiral groove.

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