Novel butterfly type micro-resistance slow-closing type water hammer-proof check valve with needle valve opening indication function

Abstract

The utility model discloses a novel butterfly type micro-resistance slow-closing waterproof hammer check valve with a needle valve having an opening indication function, which structurally comprises a valve body, a valve seat, two semicircular valve clacks and the like, the two semicircular valve clacks and the valve seat form a butterfly type check opening and closing function, and a hydraulic loop with a simpler structure is further designed. Comprising a slow-closing hydraulic air cylinder and an opening indicating needle valve which are arranged at the top of a valve body, two small air cylinder sets are arranged in the valve body, each small air cylinder set and a semicircular valve clack are correspondingly installed, and the two small air cylinder sets are communicated with the opening indicating needle valve through conveying pipes at the same time. The flow of a hydraulic medium communicated to the two small air cylinder groups by the slow-closing hydraulic air cylinder is accurately adjusted by the needle valve with the opening indication; thus, along with the change of medium pressure in a pipeline, the two semicircular valve clacks can be completely opened through inlet medium pressure, micro-resistance slow-closing type non-return of the two semicircular valve clacks can be achieved by accurately adjusting the opening degree of the needle valve, and therefore water hammers are eliminated, and use is simpler and more convenient.

Description

Technical Field

[0001] The utility model relates to a butterfly check valve, in particular to a butterfly micro-resistance slow-closing anti-water hammer check valve with a novel needle valve and an opening indicator. Background Art

[0002] At present, butterfly check valves are widely used in drainage pipes of media such as clean water, sewage, and seawater to prevent backflow of the media due to their novel structure, small size, light weight, small fluid resistance, reliable sealing, smooth opening and closing, wear resistance, long service life, and good energy-saving effect. However, due to the large changes in the medium pressure in the drainage pipe, the butterfly check valve often closes too quickly during the check closing process, resulting in water hammer. For this reason, some manufacturers also achieve micro-resistance slow closing check by adding hydraulic circuits to assist the opening and closing of the valve disc. However, the structural design of these hydraulic circuits is too complicated and difficult to be applied to butterfly check valves. In particular, the hydraulic medium flow of the hydraulic circuit needs to be adjusted by a needle valve, but these needle valve structures do not have a scale indication function. Therefore, once the needle valve opening is too small, the hydraulic medium of the hydraulic circuit cannot flow back quickly, which may easily cause the valve disc to be unable to close for a long time; once the needle valve opening is too large, the hydraulic medium of the hydraulic circuit flows back too quickly, which will cause the valve disc to close quickly and produce water hammer, while the hydraulic medium flow can only rely on the operator's visual inspection or experience to repeatedly adjust the needle valve opening. Obviously, the use process is quite troublesome. Utility Model Content

[0003] The technical problem to be solved by the utility model is to overcome the defects of the prior art and provide a butterfly type micro-resistance slow-closing anti-water hammer check valve which can realize the micro-resistance slow-closing check valve of the valve disc by accurately adjusting the opening of the needle valve and is also simpler and more convenient to use.

[0004] The technical problem of the utility model is achieved through the following technical solutions:

[0005] A new type of butterfly-type micro-resistance slow-closing waterproof hammer check valve with a needle valve and an opening indicator, comprising a valve body, a valve seat and two semicircular valve discs in the valve body, the two semicircular valve discs being rotatably mounted on a valve disc rod on one side of the valve seat, and forming a butterfly-type check valve with the valve seat, a slow-closing hydraulic cylinder and a needle valve with an opening indicator arranged on the slow-closing hydraulic cylinder being provided on the top of the valve body, two small cylinder groups being provided in the valve body, each small cylinder group being installed correspondingly to each semicircular valve disc, the two small cylinder groups being connected to the needle valve with an opening indicator at the same time through a delivery pipe, and the needle valve with an opening indicator being used to accurately adjust the flow of the hydraulic medium from the slow-closing hydraulic cylinder to the two small cylinder groups.

[0006] The inlet medium pressure in the valve body is greater than the outlet medium pressure. The inlet medium pressure pushes open the two semicircular valve flaps smoothly, and at the same time pushes the slow-closing hydraulic cylinder to connect the hydraulic medium to the two small cylinder groups, and drives the cylinder rods of the two small cylinder groups to extend and push the two semicircular valve flaps at the same time, thereby assisting the inlet medium pressure to fully open the two semicircular valve flaps; the inlet medium pressure in the valve body is less than the outlet medium pressure, and the hydraulic medium in the two small cylinder groups flows back to the slow-closing hydraulic cylinder. At the same time, the two semicircular valve flaps automatically elastically reset to form a quick closure first, and the two semicircular valve flaps that close quickly push the cylinder rods in the two small cylinder groups to retract at the same time to form a slow closure, thereby causing the two semicircular valve flaps to form a slight resistance and slow closure.

[0007] The needle valve with opening indicator comprises a main body installed on the top of the slow-closing hydraulic cylinder, a valve stem installed in the main body, and a switch handwheel installed on the top of the main body and driving the valve stem to move up and down to open and close the needle valve; the outer surface of the main body is provided with an observation window and an indicating scale arranged in conjunction with the observation window, and the outer surface of the valve stem is provided with an indicating mark exposed in the observation window; the valve stem drives the indicating mark to move up and down synchronously, and the indicating mark cooperates with the indicating scale to form an opening indication.

[0008] The switch hand wheel is provided with a switch direction indicator.

[0009] A horizontally penetrating liquid outlet channel is provided in the main body, and the two ends of the liquid outlet channel are connected to two small cylinder groups through delivery pipes respectively. A liquid inlet channel is provided below the liquid outlet channel, and the liquid inlet channel is connected to the slow-closing hydraulic cylinder and the liquid outlet channel respectively. A valve stem is provided above the liquid outlet channel, and the connection between the liquid inlet channel and the liquid outlet channel is opened and closed by the lifting and lowering movement of the valve stem.

[0010] A limiting rod is provided on one side of the valve flap rod, and a limiting block is provided in the middle of the limiting rod. The two semicircular valve flaps are fully opened until they lean on the limiting block to form a limit.

[0011] A torsion spring is provided on the valve flap rod, a hook of the torsion spring is connected to the limit rod, and the pressure foot of the torsion spring pushes on the two semicircular valve flaps at the same time; the inlet medium pressure in the valve body is greater than the outlet medium pressure, the inlet medium pressure steadily pushes the two semicircular valve flaps open, and drives the torsion spring to compress and accumulate potential; the inlet medium pressure in the valve body is less than the outlet medium pressure, and the two semicircular valve flaps are elastically reset by the torsion spring to form a rapid closure.

[0012] The limit block is a cylindrical polytetrafluoroethylene block; the two semicircular valve flaps are fully opened until they lean on the limit block to form a limit, and an angle is reserved between the two semicircular valve flaps.

[0013] Each of the semicircular valve flaps is made of a steel plate coated with EPDM rubber.

[0014] The valve seat is an inner shoulder integrally formed in the valve body.

[0015] Compared with the prior art, the utility model mainly designs a hydraulic circuit with a simpler structure for a butterfly check valve, whose structure mainly includes a slow-closing hydraulic cylinder arranged on the top of the valve body and a needle valve with an opening indicator arranged on the slow-closing hydraulic cylinder. At the same time, two small cylinder groups are added in the valve body, and each small cylinder group is installed corresponding to each semicircular valve disc. Moreover, the two small cylinder groups are also connected to the needle valve with an opening indicator through a delivery pipe, and then the needle valve with an opening indicator is used to accurately adjust the flow of the hydraulic medium from the slow-closing hydraulic cylinder to the two small cylinder groups. In this way, when the inlet medium pressure in the valve body is greater than the outlet medium pressure, the inlet medium pressure will smoothly push open the two semicircular valve flaps, and at the same time push the slow-closing hydraulic cylinder to connect the hydraulic medium to the two small cylinder groups, and drive the cylinder rods of the two small cylinder groups to extend and push the two semicircular valve flaps at the same time, thereby assisting the inlet medium pressure to fully open the two semicircular valve flaps; when the inlet medium pressure in the valve body is less than the outlet medium pressure, the hydraulic medium in the two small cylinder groups will flow back to the slow-closing hydraulic cylinder, and at the same time, the two semicircular valve flaps will automatically elastically reset to form a fast closure first, and the two semicircular valve flaps that are quickly closed will push the cylinder rods in the two small cylinder groups to retract at the same time to form a slow closure, that is, the check closing process of the two semicircular valve flaps is fast first and then slow, thereby making the two semicircular valve flaps form a micro-resistance slow-closing check function, and can also achieve the function of eliminating water hammer, so the improved butterfly check valve can realize the micro-resistance slow-closing check of the two semicircular valve flaps by accurately adjusting the needle valve opening, which is simpler and more convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a full cross-sectional view of the utility model.

[0017] Figure 2 It is a partial cross-sectional view of the utility model.

[0018] Figure 3 for Figure 1 Left view of .

[0019] Figure 4 for Figure 1 Right view of .

[0020] Figure 5 A cross-sectional diagram of a hydraulic circuit.

[0021] Figure 6 The cross-sectional view is of the cylinder rods of two small cylinder groups extending out simultaneously to push two semicircular valve discs.

[0022] Figure 7 This is a structural diagram of the needle valve with opening indication part.

[0023] Figure 8 This is a schematic diagram of the structure in which the switch direction indicator is set on the switch handwheel. DETAILED DESCRIPTION

[0024] The embodiments of the present invention will be described in detail below according to the above-mentioned drawings.

[0025] like Figure 1 to Figure 8 As shown, 1. valve body, 11. valve seat, 2. needle valve with opening indicator, 21. main body, 211. liquid outlet channel, 212. liquid inlet channel, 213. observation window, 214. indicator scale, 22. valve stem, 221. indicator mark, 23. switch handwheel, 231. switch direction indicator, 3. slow closing hydraulic cylinder, 4. limit rod, 41. limit block, 5. valve disc rod, 6. torsion spring, 61. hook, 62. presser foot, 7. semicircular valve disc, 8. delivery pipe, 9. small cylinder group, 91. cylinder rod.

[0026] A new type of butterfly type micro-resistance slow closing anti-water hammer check valve with needle valve opening indication, such as Figure 1~Figure 4 As shown, it includes a valve body 1, a valve seat 11 and two semicircular valve flaps 7 arranged in the valve body. The two semicircular valve flaps are rotatably mounted on a valve flap rod 5 on one side of the valve seat 11, that is, they just form a closed circle, thereby constituting a butterfly-type non-return opening and closing between the valve seat 11.

[0027] The valve seat 11 is an inner shoulder integrally formed in the valve body 1 , and each semicircular valve disc 7 is made of a steel plate coated with EPDM rubber, which can ensure a longer service life and a more reliable contact seal with the valve seat 11 .

[0028] At the same time, the butterfly check valve also adds a hydraulic circuit with a simpler structure, whose structure mainly includes a slow-closing hydraulic cylinder 3 installed on the top of the valve body 1 and a needle valve 2 with an opening indicator arranged on the slow-closing hydraulic cylinder. Two small cylinder groups 9 are added to the valve body 1, and each small cylinder group is installed corresponding to each semicircular valve disc 7. The two small cylinder groups 9 are also connected to the needle valve 2 with an opening indicator at the same time through the delivery pipe 8, and then the needle valve with an opening indicator is used to accurately adjust the hydraulic medium flow from the slow-closing hydraulic cylinder 3 to the two small cylinder groups 9.

[0029] The needle valve 2 with opening indication includes a main body 21 installed on the top of the slow-closing hydraulic cylinder 3, and a horizontally penetrating liquid outlet channel 211 is provided in the main body, and the two ends of the liquid outlet channel are respectively connected to two small cylinder groups 9 through a delivery pipe 8. The delivery pipe 8 can be a copper tube. A liquid inlet channel 212 is provided below the liquid outlet channel 211. The liquid inlet channel is a vertical channel, and the upper end of the liquid inlet channel 212 is connected to the middle of the liquid outlet channel 211 to form a T-shape, and the lower end of the liquid inlet channel 212 is connected to the slow-closing hydraulic cylinder 3, that is, the slow-closing hydraulic cylinder 3 and the liquid outlet channel 211 can be connected respectively through the liquid inlet channel 212.

[0030] A valve stem 22 is provided above the liquid outlet channel 211. The valve stem is installed in the main body 21 in a rotating vertical sealing manner. A switch handwheel 23 is provided on the top of the main body. The switch handwheel can drive the valve stem 22 to rotate, which is then converted into a lifting movement to open and close the connection between the liquid inlet channel 212 and the liquid outlet channel 211. That is, the lifting movement of the valve stem 22 realizes the opening and closing of the needle valve.

[0031] The outer surface of the main body 21 is provided with an observation window 213 and an indicator scale 214 arranged to match the observation window. The indicator scale is usually in the form of a scale line embedded in the outer surface of the main body. The scale marking range is 0mm to 20mm, and the position where the needle valve can be fully opened is at the 20mm scale line.

[0032] The outer surface of the valve stem 22 is provided with an indicator mark 221 exposed in the observation window 213. The indicator mark can be a striking red ring, which can be inserted into the ring groove of the valve stem 22 and fixed with anaerobic glue. Therefore, the valve stem 22 drives the indicator mark 221 to move up and down synchronously, and the indicator mark 221 cooperates with the indicator scale 214 to form an opening indication of the needle valve. A switch direction indicator plate 231 for indicating the rotation direction is also provided on the switch handwheel 23. The structural design is simple and the manufacturing cost is low.

[0033] In this way, when the inlet medium pressure in the valve body 1 is greater than the outlet medium pressure, the inlet medium pressure will smoothly push open the two semicircular valve flaps 7, and at the same time push the slow-closing hydraulic cylinder 3 to connect the hydraulic medium to the two small cylinder groups 9. At this time, the valve opening mark with the opening indicating needle valve 2 is usually located at the 12mm scale line, which can drive the cylinder rods 91 of the two small cylinder groups 9 to extend and push the two semicircular valve flaps 7 at the same time, and then assist with the inlet medium pressure to fully open the two semicircular valve flaps 7, that is, the valve is fully opened.

[0034] A limit rod 4 is provided on one side of the valve flap rod 5, and the limit rod is parallel to the valve flap rod. A limit block 41 is provided in the middle of the limit rod 4, and the limit block is a cylindrical polytetrafluoroethylene block. When the two semicircular valve flaps 7 are fully opened until they lean on the limit block 41, a limit can be formed, and the two semicircular valve flaps 7 are prevented from colliding and being damaged after being fully opened. At this time, an angle is reserved between the two semicircular valve flaps 7 through the limit block 41.

[0035] When the inlet medium pressure in the valve body 1 is lower than the outlet medium pressure, the hydraulic medium in the two small cylinder groups 9 will flow back into the slow-closing hydraulic cylinder 3, and at the same time, the two semicircular valve flaps 7 will use the impact angle of the reflux medium and cooperate with automatic elastic reset to form a quick closure first, that is, to achieve the purpose of quick check, and the two semicircular valve flaps 7 that close quickly also need to push the cylinder rods 1 in the two small cylinder groups 9 to retract at the same time to form a slow closure. This is because when the cylinder rod is in the extended position, it will support the two semicircular valve flaps 7 and cannot be completely closed quickly. Usually, the remaining area of ​​about 20% is available for the reflux medium to pass through, which plays a role in eliminating water hammer. Therefore, the check closing process of the two semicircular valve flaps 7 is fast at first and then slow, thereby making the two semicircular valve flaps 7 form a micro-resistance slow-closing check function, which can prevent the motor from reversing and play a role in eliminating water hammer and silencing.

[0036] In addition, the automatic elastic reset of the two semicircular valve flaps 7 is achieved by providing a torsion spring 6 on the valve flap rod 5, a hook 61 of the torsion spring is connected to the limit rod 4, and a pressure foot 62 of the torsion spring pushes on the two semicircular valve flaps 7 at the same time to form a balanced distributed load force on the two semicircular valve flaps.

[0037] When the inlet medium pressure in the valve body 1 is greater than the outlet medium pressure, the inlet medium pressure will steadily push open the two semicircular valve flaps 7, which will drive the torsion spring 6 to compress and accumulate potential; when the inlet medium pressure in the valve body 1 is less than the outlet medium pressure, the two semicircular valve flaps 7 will be elastically reset by the torsion spring 6 to form a rapid closure. At the same time, the two completely closed semicircular valve flaps 7 can also be tightly fitted on the valve seat 11 by the elastic force of the torsion spring 6, thereby forming a stable sealing system and preventing medium backflow.

[0038] The utility model can realize the micro-resistance slow closing check valve of the two semicircular valve discs 7 by accurately adjusting the needle valve opening, which is simpler and more convenient to use, so it can be widely used in drainage pipes of media such as clean water, sewage, and seawater, which can not only prevent the backflow of the medium, but also effectively limit the destructive water hammer, ensuring the safety of the pipeline.

[0039] The above description is only a specific embodiment of the present invention. Those skilled in the art should understand that any structural design equivalent to this embodiment should be included in the protection scope of the present invention.

Claims

1. A new type of butterfly-type micro-resistance slow-closing anti-water hammer check valve with a needle valve and an opening indicator, comprising a valve body (1), a valve seat (11) and two semicircular valve discs (7) in the valve body, the two semicircular valve discs being rotatably mounted on a valve disc rod (5) on one side of the valve seat (11) and forming a butterfly-type check valve opening and closing mechanism with the valve seat (11), characterized in that The top of the valve body (1) is provided with a slow-closing hydraulic cylinder (3) and a needle valve (2) with an opening indication arranged on the slow-closing hydraulic cylinder. Two small cylinder groups (9) are arranged in the valve body (1). Each small cylinder group is installed corresponding to each semicircular valve disc (7). The two small cylinder groups (9) are connected to the needle valve (2) with an opening indication through a delivery pipe (8) at the same time, and the needle valve with an opening indication is used to accurately adjust the flow rate of the hydraulic medium connected from the slow-closing hydraulic cylinder (3) to the two small cylinder groups (9).

2. According to claim 1, a new type of butterfly type micro-resistance slow closing anti-water hammer check valve with needle valve opening indication is characterized in that The inlet medium pressure in the valve body (1) is greater than the outlet medium pressure. The inlet medium pressure steadily pushes open the two semicircular valve flaps (7) and simultaneously pushes the slow-closing hydraulic cylinder (3) so that the hydraulic medium is connected to the two small cylinder groups (9) and drives the cylinder rods (91) of the two small cylinder groups to simultaneously extend and push the two semicircular valve flaps (7), thereby assisting the inlet medium pressure to fully open the two semicircular valve flaps (7). The inlet medium pressure in the valve body (1) is less than the outlet medium pressure. The hydraulic medium in the two small cylinder groups (9) flows back into the slow-closing hydraulic cylinder (3). At the same time, the two semicircular valve flaps (7) automatically elastically reset to form a rapid closure first. The two semicircular valve flaps (7) that are rapidly closed push the cylinder rods (91) in the two small cylinder groups (9) to simultaneously retract and then form a slow closure, thereby causing the two semicircular valve flaps (7) to form a slight resistance and slow closure.

3. According to claim 1, a new type of butterfly type micro-resistance slow closing anti-water hammer check valve with needle valve opening indication is characterized in that The needle valve (2) with opening indication comprises a main body (21) mounted on the top of a slow-closing hydraulic cylinder (3), a valve stem (22) mounted in the main body, and a switch hand wheel (23) mounted on the top of the main body and driving the valve stem to move up and down to open and close the needle valve; the outer surface of the main body (21) is provided with an observation window (213) and an indication scale (214) arranged in coordination with the observation window, and the outer surface of the valve stem (22) is provided with an indication mark (221) exposed in the observation window (213); the valve stem (22) drives the indication mark (221) to move up and down synchronously, and the indication mark cooperates with the indication scale (214) to form an opening indication.

4. According to claim 3, a new type of butterfly type micro-resistance slow closing anti-water hammer check valve with needle valve opening indication is characterized in that The switch hand wheel (23) is provided with a switch direction indicator (231).

5. According to claim 3, a new type of butterfly type micro-resistance slow closing anti-water hammer check valve with needle valve opening indication is characterized in that A horizontally penetrating liquid outlet channel (211) is provided in the main body (21), and the two ends of the liquid outlet channel are respectively connected to the two small cylinder groups (9) via the delivery pipe (8). A liquid inlet channel (212) is provided below the liquid outlet channel (211), and the liquid inlet channel is respectively connected to the slow-closing hydraulic cylinder (3) and the liquid outlet channel (211). A valve stem (22) is provided above the liquid outlet channel, and the connection between the liquid inlet channel (212) and the liquid outlet channel (211) is opened and closed by the lifting and lowering movement of the valve stem.

6. According to claim 2, a new type of butterfly type micro-resistance slow closing anti-water hammer check valve with needle valve opening indication is characterized in that A limiting rod (4) is provided on one side of the valve flap rod (5), and a limiting block (41) is provided in the middle of the limiting rod. The two semicircular valve flaps (7) are fully opened until they lean against the limiting block (41) to form a limit.

7. According to claim 6, a new type of butterfly type micro-resistance slow closing anti-water hammer check valve with needle valve opening indication is characterized in that The valve flap rod (5) is provided with a torsion spring (6), a hook (61) of the torsion spring is connected to the limit rod (4), and a pressure foot (62) of the torsion spring pushes on the two semicircular valve flaps (7) at the same time; the inlet medium pressure in the valve body (1) is greater than the outlet medium pressure, the inlet medium pressure steadily pushes the two semicircular valve flaps (7) apart, and drives the torsion spring (6) to compress and accumulate potential; the inlet medium pressure in the valve body (1) is less than the outlet medium pressure, and the two semicircular valve flaps (7) are elastically reset by the torsion spring (6) to form a rapid closure.

8. According to claim 6, a new type of butterfly type micro-resistance slow closing anti-water hammer check valve with needle valve opening indication is characterized in that The limit block (41) is a cylindrical polytetrafluoroethylene block; the two semicircular valve flaps (7) are fully opened until they lean against the limit block (41) to form a limit, and an angle is reserved between the two semicircular valve flaps (7).

9. According to claim 1, a new type of butterfly type micro-resistance slow closing anti-water hammer check valve with needle valve opening indication is characterized in that Each of the semicircular valve discs (7) is made of a steel plate coated with EPDM rubber.

10. According to claim 1, a new type of butterfly type micro-resistance slow closing anti-water hammer check valve with needle valve opening indication, characterized in that The valve seat (11) is an inner shoulder integrally formed in the valve body (1).

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