TWM644874U - Gate valve with improved actuation accuracy - Google Patents

Abstract

The gate valve of this invention includes a valve seat, a first piston unit, a second piston unit, and a valve. The valve seat has a valve port that matches the valve. The first piston unit is located in the valve seat and can be driven by the fluid to drive the valve between a first position that opens the valve port and a second position that shields the valve port. Actuate, the second piston unit is located in the valve seat and can be driven by the fluid to drive the valve to act between the second position and a third position close to the valve port, wherein at least one channel switch is provided inside the valve seat, When the flow channel switch is opened, the fluid can be allowed to pass through and drive the second piston unit, so that the second piston unit can accurately drive the valve and the valve port to close to each other, thus achieving the purpose of improving actuation accuracy and ensuring the air-tight effect.

Description

Gate valve that can improve operating accuracy

This creation is related to gate valves, specifically a gate valve that can improve the accuracy of operation.

To put it simply, traditional vacuum valves mainly use fluid to drive the valve stem to move along two degrees of freedom, so that the valve plate is driven by the valve stem to move to the valve port in a direction parallel to the valve port, and then is driven by the valve stem. It is driven to move toward the valve port in the direction vertical to the valve port until it is in close contact with the valve port to ensure the airtight effect between the two.

However, the valve stem provided by the traditional vacuum valve is driven by the fluid on the one hand and the valve plate on the other hand. Once the pressure of the fluid is not controlled well, the accuracy of the valve plate's operation will be affected, causing the valve to The plate has defects that cannot be tightly sealed, resulting in insufficient air density between the valve plate and the valve port. Therefore, there is still room for improvement in the structure of traditional vacuum valves.

The main purpose of this invention is to provide a gate valve that can improve the accuracy of operation to ensure the air-tight effect.

In order to achieve the above main purpose, the gate valve of the present invention includes a valve seat, a first piston unit, a second piston unit, a valve unit, and a first channel switch. The valve seat has a valve port, an axis hole, a receiving groove, a first piston groove and a second piston groove. The axis hole is axially perpendicular to the valve port. In an opening direction, the receiving groove is located between the valve port and the shaft hole, the first piston groove is adjacent to the shaft hole, and an axial direction of the first piston groove is parallel to the axial direction of the shaft hole, and the second The piston groove is adjacent to the receiving groove, and an axial direction of the second piston groove is parallel to the opening direction of the valve port. In addition, the valve seat has a fluid inlet and outlet, a fluid inlet, a fluid outlet, and a connecting fluid inlet and outlet. a first flow channel, a second flow channel connected to the first flow channel, a third flow channel connected to the first flow channel, a fourth flow channel connected to the third flow channel, and a fourth flow channel connected to the fourth flow channel and the A fifth flow channel of the fluid outlet, a sixth flow channel connected to the fluid inlet, and a seventh flow channel connected to the sixth flow channel, wherein the first flow channel, the second flow channel, the third flow channel The channel, the fourth flow channel, the fifth flow channel, the sixth flow channel and the seventh flow channel are all used for a fluid to pass; the first piston unit has a first piston, a first piston shaft and A transmission seat, the first piston is displaceably disposed in the first piston groove of the valve seat, and an end of the first piston and an end wall of the first shaft hole are formed to communicate with the second flow channel. the first chamber, so that the first piston can be driven by the fluid entering the first chamber to move along the axial direction of the first piston groove toward the direction of the valve port, and an outer periphery of the first piston A second chamber communicating with the seventh flow channel is formed between the surface and a peripheral wall of the first shaft hole, so that the first piston can be driven by the fluid entering the second chamber along the first The axial direction of the piston groove moves away from the valve port. The first piston shaft is partially exposed in the groove of the valve seat and is connected to the first piston at one end, so that the first piston shaft can be subjected to the The first piston is driven to reciprocate along the axial direction of the first piston groove, and the transmission seat is disposed in the groove of the valve seat in a manner that can be displaced along the axial direction of the first piston groove. The first piston shaft is connected in a manner that can be displaced along the axial direction of the second piston groove, so that the transmission seat can be driven by the first piston shaft to reciprocate along the axial direction of the first piston groove. ;The second piston unit has a second piston shaft and a second piston. The second piston shaft is embedded in the transmission seat and allows the transmission seat to move relative to it along the axial direction of the first piston groove, The second piston is movably disposed in the second piston groove of the valve seat and connected to the second piston shaft. A third chamber connected to the fourth flow channel and a fourth chamber connected to the sixth flow channel are respectively formed between the two opposite end surfaces of the plug and the two opposite end walls of the second piston groove, so that the second On the one hand, the piston can be driven by the fluid entering the third chamber to push the transmission seat along the axis of the second piston groove in a direction away from the first piston axis through the second piston axis, and on the other hand, the piston can be driven by the fluid entering the third chamber. On the one hand, it can be driven by the fluid entering the fourth chamber to pull the transmission seat along the axis of the second piston groove in the direction of the first piston axis through the second piston axis; the valve unit has A pivot seat, a valve drive shaft and a valve. The pivot seat is movably disposed in the axis hole of the valve seat. The valve drive shaft is fixed on the transmission seat and one end thereof is inserted into the valve seat. The shaft hole is pivotally connected to the pivot seat so that the valve drive shaft can move synchronously with the transmission seat. The valve is connected to the valve drive shaft so that the valve can be moved by the axial displacement of the valve drive shaft. Displaced between a first position that opens the valve port and a second position that covers the valve port, and can be connected to a third position that is close to the valve port by pivoting the valve drive shaft. Displacement between three positions; the flow channel switch is located at at least one of the connection between the third flow channel and the fourth flow channel and the connection between the sixth flow channel and the seventh flow channel. When When the flow channel switch is opened, the fluid can be allowed to pass.

From the above, it can be seen that when the fluid enters the first chamber along the second flow channel, the first piston unit will be driven by the fluid and drive the valve from the first position through the transmission seat and the valve driving shaft. After moving to the second position, and then the fluid reaches the third chamber along the third flow channel and the fourth flow channel, the second piston unit will be driven by the fluid and pass through the transmission seat and the valve. The driving shaft drives the valve to move from the second position to the third position, so that the valve completes the sealing of the valve port. At this time, the fluid located in the fourth flow channel will flow from the fifth flow channel along the fifth flow channel. The fluid outlet is discharged out of the valve seat; on the contrary, when the fluid enters the fourth chamber along the sixth flow channel, the second piston unit will be driven by the fluid through the transmission seat and the valve drive shaft. The valve moves from the third position to the second position position, and then after the fluid reaches the second chamber along the seventh flow channel, the first piston unit will be driven by the fluid to drive the valve to move from the second position to The first position allows the valve to complete the opening of the valve port. At this time, the fluid in the first chamber will flow along the second flow channel to the first flow channel and then be discharged out of the valve seat through the fluid inlet and outlet. . During the flow process of the fluid, the flow channel switch is used to control whether the fluid can pass through. Before the fluid completely arrives, the flow channel switch is in a closed state. Until the fluid completely arrives, the flow channel switch Only then will it be opened to allow the fluid to pass through, so that the pressure provided by the fluid can reliably drive the first and second piston units. In this way, the valve can accurately close or open the valve port, thereby improving the accuracy of the operation and ensuring the air-tight effect.

Preferably, the fluid switch can be provided only at the connection between the third flow channel and the fourth flow channel, or only at the connection between the sixth flow channel and the seventh flow channel, according to actual needs, Or it may also be provided at the connection point between the third flow channel and the fourth flow channel and the connection point between the sixth flow channel and the seventh flow channel.

Preferably, when the fluid switch is disposed at the connection between the third flow channel and the fourth flow channel, the fluid switch has a switch seat, a valve stem, and a seal set on the valve stem. and an elastic member. The switch seat has a fluid input hole connected to the third flow channel and a fluid output hole connected to the fourth flow channel. The valve stem is located in the switch seat and can be received by the first The piston shaft is driven to move from a closed position to an open position. Thereby, when the valve stem is in the closed position under the elastic force of the elastic member, the fluid entering the switch seat from the fluid input hole is blocked by the seal and cannot flow to the fluid output hole. When the valve stem is driven by the first piston shaft and is in the open position, the fluid entering the switch seat from the fluid input hole will not be blocked by the seal and can flow to the fluid output hole.

Preferably, when the fluid switch is disposed at the connection between the sixth flow channel and the seventh flow channel, the flow channel switch has a switch seat, a valve stem, and a valve stem that is sleeved on the valve stem. Seal, and an elastic member. The switch seat has a fluid input hole connected to the sixth flow channel and a fluid output hole connected to the seventh flow channel. The valve stem is located in the switch seat and can be received by the third flow channel. The two piston shafts are driven to move from a closed position to an open position. Thereby, when the valve stem is in the closed position under the action of the elastic member, the fluid entering the switch seat from the fluid input hole is blocked by the seal and cannot flow to the fluid output hole. When the valve stem is driven by the second piston shaft and is in the open position, the fluid entering the switch seat from the fluid input hole will not be blocked by the seal and can flow to the fluid output hole.

Preferably, a flow channel switch can be provided at the communication point between the fifth flow channel and the fluid outlet. The flow channel switch has a valve stem, a seal set on the valve stem and an elastic member. The valve stem is disposed in a fluid output groove of the valve seat and can be driven by the second piston shaft to move from a closed position to an open position. Thereby, when the valve stem is in the closed position under the elastic force of the elastic member, the fluid entering the fluid output groove from the fifth flow channel is blocked by the seal and cannot flow to the fluid outlet. When the valve stem is driven by the second piston shaft and is in the open position, the fluid entering the fluid output groove from the fifth flow channel will not be blocked by the seal and can flow to the fluid outlet.

Preferably, the valve seat further has a buffer channel connected between the first flow channel and the second flow channel. A plug and an elastic member are disposed in the buffer channel, and the plug is located on the buffer channel. Between the channel and the first flow channel, the elastic member acts on the plug head and provides elastic force to push the plug head toward the direction of the first flow channel. Thereby, when the pressure exerted by the fluid on the plug head is greater than the pressure exerted by the elastic member on the plug head, the fluid can flow from the first flow channel through the buffer channel to the second flow channel, and then from The second flow channel reaches the first chamber; conversely, when the fluid flows from the first chamber to the second flow channel and reaches the buffer channel, the fluid will flow along the gap between the plug and the buffer channel. The gap between slowly flows to the first flow channel, and then discharged from the first flow channel to the outside of the valve seat, thus buffering the discharge pressure of the fluid and preventing the valve from opening too quickly.

The detailed structure, characteristics, assembly or usage of the gate valve provided by this invention that can improve the accuracy of operation will be described in the subsequent detailed description of the implementation. However, those with ordinary knowledge in the field of this invention should understand that these detailed descriptions and specific examples for implementing the invention are only used to illustrate the invention and are not intended to limit the scope of the patent application of the invention.

10: Gate valve

12:First connector

14:Second connector

20: Valve seat

21:First ontology

212: Valve port

22:Second body

221: Shaft hole

222:Tank

223: First piston groove

224: Second piston groove

225:Cover

226: Fluid inlet and outlet

227: Fluid inlet

228: Fluid outlet

229: Fluid output tank

23:First flow channel

24:Second flow channel

242: First straight line segment

244: Second straight line segment

25:Third channel

252: The third straight line segment

254: The first turning point

256: The second turning section

26:Fourth channel

262: The third turning section

264: The fourth turning point

27:Fifth flow channel

272: The fourth straight line segment

274: The fifth turning point

28:Sixth channel

282: The sixth turning point

284: The fifth straight line segment

286: The sixth straight line segment

29:Seventh Channel

292: The seventh turning section

294:Seventh straight line segment

296: The eighth straight line segment

30: First piston unit

31:First piston

32:First chamber

33:Second chamber

34:First piston shaft

342: Trail Department

344:Large diameter part

346: Radial perforation

35: Transmission seat

352:Straight hole

354: Countersunk hole

356:Screw hole

358:Arc groove

36:bolt

37: Curved pad

40: Second piston unit

41:Second piston shaft

412a: Push to the top

412b: Push to the top

42:Second piston

422:convex part

43:Third chamber

44:Fourth chamber

50:Valve unit

51: Pivot base

52:Valve drive shaft

53:Valve

P1: first position

P2: second position

P3: third position

60: First fluid switch

61:Switch seat

612: Fluid input hole

614: Fluid output hole

616:Port hole

62:Valve stem

622:Head

624:Body

63:Seals

64: Elastic parts

P4: closed position

P5: open position

70: Second fluid switch

71:Switch seat

712: Fluid input hole

714: Fluid output hole

72:Valve stem

722:Head

724:Body

73:Seals

74: Elastic parts

80:Third fluid switch

81:Valve stem

812:Head

814:Body

82:Seals

83: Elastic parts

84:Trough cover

90: Buffer channel

91: plug head

92: Elastic parts

93:Seals

Figure 1 is a three-dimensional view of the gate valve of this invention, mainly showing the positions of the first flow channel, the second flow channel, the third flow channel, the fourth flow channel and the fifth flow channel.

Figure 2 is another perspective view of the gate valve of this invention, mainly showing the positions of the sixth flow channel and the seventh flow channel.

Figure 3 is a plan view of the gate valve of this creation.

Figure 4 is a cross-sectional view along line 4-4 in Figure 3, mainly showing that the valve is in the first position.

FIG. 5 is a cross-sectional view along line 5-5 in FIG. 3 , mainly showing that fluid enters the first chamber from the first flow channel through the second flow channel.

Figure 6 is a cross-sectional view along line 6-6 in Figure 4, mainly showing that the first fluid switch is in a closed position.

Figure 7 is a cross-sectional view along line 7-7 in Figure 3, mainly showing that the second fluid switch is in the open position.

Figure 8 is a cross-sectional view along line 8-8 in Figure 7, mainly showing that the second fluid switch is in the open position.

Figure 9 is a cross-sectional view along line 9-9 in Figure 3, mainly showing that the second fluid switch is in a closed position.

Figure 10 is a cross-sectional view along line 10-10 in Figure 3, mainly showing that the second fluid switch is in a closed position.

FIG. 11 is a cross-sectional view along line 11-11 in FIG. 3 .

Figure 12 is a cross-sectional view along line 12-12 in Figure 3, mainly showing that the valve is in the first position.

Figure 13 is similar to Figure 4, mainly showing the valve in the second position.

Figure 14 is similar to Figure 13, mainly showing the valve in the third position.

Figure 15 is similar to Figure 6, mainly showing that the first fluid switch is in the open position.

Figure 16 is similar to Figure 12, mainly showing the valve in the second position.

Figure 17 is similar to Figure 16, mainly showing the valve in the third position.

Figure 18 is similar to Figure 7, mainly showing that the second fluid switch is in the closed position.

Figure 19 is similar to Figure 8, mainly showing that the second fluid switch is in the closed position.

Figure 20 is similar to Figure 11, mainly showing that the second piston is pushed upward by the fluid.

Figure 21 is similar to Figure 10, mainly showing that the second fluid switch is in the open position.

Figure 22 is similar to Figure 9, mainly showing that the second fluid switch is in the open position.

Figure 23 is similar to Figure 5, mainly showing that the fluid returns from the first chamber to the first flow channel through the second flow channel.

The applicant would like to first explain that in the entire description, including the embodiments introduced below and the claims in the patent application scope, terms related to directionality are based on the direction in the drawings. Secondly, in the embodiments and drawings to be introduced below, the same component numbers represent the same or similar components or structural features.

Please refer to Figures 1, 2, 4, 7 and 12. The gate valve 10 of the present invention includes a valve seat 20, two first piston units 30, two second piston units 40, a valve unit 50, and three flow channels. Switch 60,70,80.

The valve seat 20 has a rectangular first body 21 and a rectangular second body 22. One of the short sides of the second body 22 is connected to one of the long sides of the first body 21 by screw locking, so that The valve seat 20 is configured in a T-shape. The first body 21 has a valve port 212 penetrating its top and bottom surfaces. The interior of the second body 22 has a shaft hole 221, a receiving groove 222, two first piston grooves 223 and two second piston grooves 224, wherein the shaft The axial direction of the hole 221 is perpendicular to the opening direction of the valve port 212 (as shown in Figure 12); the receiving groove 222 is located between the valve port 212 and the shaft hole 221 and is interconnected with the valve port 212 and the shaft hole 221 (as shown in Figure 12) ); each first piston groove 223 is located adjacent to the shaft hole 221, and the axial direction of each first piston groove 223 is perpendicular to the opening direction of the valve port 212 (as shown in Figures 4 and 5); each second piston groove 224 is adjacent to It is provided in the receiving groove 222 and is covered by a cover plate 225, and the axial direction of the second piston groove 224 is parallel to the opening direction of the valve port 212 (as shown in Figure 4).

As shown in FIGS. 1 and 2 , one side of the second body 22 has a fluid inlet 226 and a fluid inlet 227 located below the fluid inlet 226 . The fluid inlet 226 is equipped with a first connector 12 , and the fluid inlet 227 is equipped with a second connector 12 . Connector 14. As shown in FIG. 7 , the bottom surface of the second body 22 has a fluid outlet 228 , and the second body 22 also has a fluid output slot 229 connected to the fluid outlet 228 . In addition, as shown in FIGS. 1 and 2 , the second body 22 has a first flow channel 23 , a second flow channel 24 , a third flow channel 25 , a fourth flow channel 26 , and a fifth flow channel inside. 27. A sixth flow channel 28, and a seventh flow channel 29. The first to seventh flow channels 23, 24, 25, 26, 27, 28, 29 are all used to supply a fluid (here high-pressure gas is used as For example, but not limited to), one end of the first flow channel 23 is connected to the first joint 12 (as shown in FIGS. 1 and 5 ) via the fluid inlet and outlet 226; the second flow channel 24 has a first straight section 242 and Two second straight sections 244 are arranged at intervals. As shown in Figures 1 and 5, the first straight section 242 extends along the width direction of the second body 22, and one end of the first straight section 242 is connected to the first flow channel 23. Each of the first straight sections 242 is connected to the first flow channel 23. One end of the two straight sections 244 is vertically connected to the first straight section 242; the third flow channel 25 has a third straight section 252, a first turning section 254 and a second turning section 256, as shown in Figures 1 and 4. One end of the three straight line segments 252 is vertically connected to the first flow channel 23 and the first turning segment One end of 254 is vertically connected to the third straight section 252, and the other end of the first turning section 254 is vertically connected to the second turning section 256. The second turning section 256 extends along the length direction of the second body 22 toward the direction of the first body 21; The fourth flow channel 26 has a third turning section 262 and a fourth turning section 264. As shown in Figures 1, 6 and 7, the third turning section 262 moves away from the first turning section along the length direction of the second body 22. The fourth turning section 264 extends along the width direction of the second body 21 and is vertically connected to the third turning section 262 at one end; the fifth flow channel 27 has a fourth straight section 272 and a fifth turning section. Section 274, as shown in Figures 1 and 18, one end of the fourth straight section 272 is connected to the fourth turning section 264 of the fourth flow channel 26, one end of the fifth turning section 274 is vertically connected to the fourth straight section 272, and the fifth turning section 274 is vertically connected to the fourth straight section 272. The other end of the section 274 is connected to the fluid output groove 229; the sixth flow channel 28 has a sixth turning section 282, two fifth straight sections 284 and a sixth straight section 286 arranged at intervals, as shown in Figure 2. One end of the turning section 282 is connected to the second connector 14 through the fluid inlet 227. Each fifth straight section 284 extends along the length direction of the second body 22 and is vertically connected to the sixth turning section 282 with one end. One end of the sixth straight section 286 Vertically connected to one of the fifth straight sections 284; the seventh flow channel 29 has a seventh turning section 292, a seventh straight section 294 and two eighth straight sections 296 arranged at intervals. As shown in Figure 2, the seventh turning section One end of the segment 292 is vertically connected to the seventh straight segment 294 , the seventh straight segment 294 extends along the width direction of the second body 22 , and one end of each eighth straight segment 296 is vertically connected to the seventh straight segment 294 .

Each first piston unit 30 has a first piston 31 , a first piston shaft 34 and a transmission seat 35 . As shown in Figure 4, the first piston 31 is displaceably disposed in the first piston groove 223 of the valve seat 20, and a first chamber 32 is formed between one end of the first piston 31 and the end wall of the first piston groove 223. (As shown in Figure 13), the first chamber 32 is connected to the second straight section 244 of the second flow channel 24 (as shown in Figures 5 and 13), so that the first piston 31 can be inserted into the first chamber 32. Driven by the fluid, it moves along the axial direction of the first piston groove 223 toward the direction of the valve port 212 (as shown in FIG. 13 ). In addition, a formation is formed between the outer peripheral surface of the first piston 31 and the peripheral wall of the first piston groove 223 A second chamber 33 (as shown in Figure 13), the second chamber 33 is connected to the eighth straight section of the seventh flow channel 29 296 (as shown in Figure 13), so that the first piston 31 can be driven by the fluid entering the second chamber 33 and move along the axial direction of the first piston groove 223 in a direction away from the valve port 212 (Figure 4 as shown); the first piston shaft 34 has a small diameter portion 342 and a large diameter portion 344. As shown in Figure 4, the small diameter portion 342 is located in the groove 222 of the valve seat 20 and has a radial through hole 346. One end of the diameter portion 344 penetrates into the first piston groove 223 and is connected to the first piston 31. The other end of the large diameter portion 344 is exposed in the groove 222 of the valve seat 20 and is connected to the small diameter portion 342, so that the first piston axis 34 can be driven by the first piston 31 to reciprocate along the axial direction of the first piston groove 223; the transmission seat 35 is provided in the groove 222 of the valve seat 20 and is sleeved on each first piston shaft with a straight hole 352 34, the transmission base 35 also has a countersunk hole 354 connected to the straight hole 352 and a screw hole 356 connected to the straight hole 352, as shown in Figure 4 , by passing a bolt 36 from bottom to top through the countersunk hole 354 and the radial through hole 346 and locked in the screw hole 356, so that the transmission seat 35 can follow the first piston shaft 34 along the first piston groove 223. The axial reciprocating displacement (as shown in FIGS. 4 and 13 ), on the other hand, can reciprocate along the axial direction of the second piston groove 224 relative to the first piston unit 30 (as shown in FIGS. 13 and 14 ). In addition, as shown in FIG. 8 , the two ends of the transmission seat 35 respectively have an arc-shaped groove 358 , and an arc-shaped gasket 37 is disposed in the arc-shaped groove 358 .

Each second piston unit 40 has a second piston shaft 41 and a second piston 42 . The second piston shaft 41 is embedded in the transmission seat 35 through the arc-shaped gasket 37 (as shown in FIG. 8 ), so that the second piston shaft 41 can allow the transmission seat 35 to move relative to the transmission seat 35 along the axial direction of the first piston groove 223 . On the other hand, it can move back and forth along the axial direction of the second piston groove 224 together with the transmission seat 35. In addition, as shown in Figures 8 and 9, the end of one of the second piston shafts 41 has a push top 412a, Another second piston shaft 41 has a push top 412b at its end; as shown in FIG. 7 , the second piston 42 is movably disposed in the second piston groove 224 of the valve seat 20 and uses two holes passing through the second piston groove 224. The protruding portion 422 is screwed to the second piston shaft 41 so that the second piston 42 can move synchronously with the second piston shaft 41. In addition, a third cavity is formed between the top surface of the second piston 42 and the cover plate 225. The third chamber 43 is connected to the fourth turning section 264 of the fourth flow channel 26, so that the second piston 42 can receive The fluid entering the third chamber 43 is driven to push the transmission seat 35 downward along the axial direction of the second piston groove 224 through the second piston shaft 41 (as shown in FIGS. 11 and 20 ), and the second piston A fourth chamber 44 is formed between the bottom surface of 42 and the bottom wall of the second piston groove 224. The fourth chamber 44 is connected to the fifth straight section 284 of the sixth flow channel 28, so that the second piston 42 can enter the fourth chamber 44. The fluid in the chamber 44 drives the transmission seat 35 upward along the axial direction of the second piston groove 224 through the second piston shaft 41 (as shown in FIGS. 11 and 20 ).

The valve unit 50 has a pivot seat 51, a valve driving shaft 52 and a valve 53. As shown in Figure 12, the pivot seat 51 is movably disposed in the shaft hole 221 of the valve seat 20; the valve driving shaft 52 is fixed on One end of the transmission seat 35 penetrates into the shaft hole 221 of the valve seat 20 and is pivotally connected to the pivot seat 51, so that the valve driving shaft 52 can synchronously move along the axial direction of the first piston groove 223 with the transmission seat 35. , on the other hand, can be driven by the transmission seat 35 to pivot; the valve 53 is connected to the valve driving shaft 52, so that the valve 53 can be moved to the first position P1 of an open valve port 212 through the displacement of the valve driving shaft 52 (as shown in the figure) 12) and a second position P2 (shown in Figure 16) that shields the valve port 212, and can be connected to a close valve port 212 at the second position P2 by the pivot of the valve drive shaft 52 and the third position P3 (shown in Figure 17).

The flow channel switches 60, 70, and 80 can be arranged at the connection between the third flow channel 25 and the fourth flow channel 26, the connection between the sixth flow channel 28 and the seventh flow channel 29, or the fifth flow channel 27 according to actual needs. At least one of the communication points with the fluid outlet 228. In this embodiment, the flow path switches 60, 70, and 80 are respectively disposed at the communication points between the third flow path 25 and the fourth flow path 26, and the sixth flow path 28. The connection point with the seventh flow channel 29, and the connection point between the fifth flow channel 27 and the fluid outlet 228, that is, there are three flow channel switches 60, 70, and 80, which are respectively a first fluid switch 60, a first fluid switch 60, and a first fluid switch 60. Two fluid switches 70, and a third fluid switch 80, wherein: as shown in FIG. 1, the first fluid switch 60 is provided at the connection between the third flow channel 25 and the fourth flow channel 26. Furthermore, as shown in Figure 6, the first flow channel switch 60 has a switch seat 61, a valve stem 62, a seal 63, and an elastic member 64, wherein the switch seat 61 has a fluid input hole 612 and a fluid The output hole 614 and the fluid input hole 612 are connected to the second turning section 256 of the third flow channel 25 (as shown in Figure 4 ), and the fluid output hole 614 is connected to the third turning section 262 of the fourth flow channel 26 (as shown in Figure 6 ), in addition, one end of the switch seat 61 has an end hole 616 communicating with the receiving groove 222; the valve stem 62 is provided in the switch seat 61 and has a head 622 and a body 624 connecting the head 622. The body 624 The end protrudes into the end hole 616 of the switch seat 61 for the small diameter portion 342 of the first piston shaft 34 to push (as shown in Figure 15); the seal 63 is sleeved on the body 624 of the valve stem 62 and is located at the fluid input Between the hole 612 and the fluid output hole 614; one end of the elastic member 64 abuts the first body 21, and the other end of the elastic member 64 abuts the head 622 of the valve stem 62 to provide elastic force to the valve stem 62. Therefore, when the valve stem 62 is located at a closed position P4 by the elastic force of the elastic member 64, as shown in FIG. 6, the fluid entering the switch seat 61 from the fluid input hole 612 will be blocked by the seal 63 and unable to flow. to the fluid output hole 614. When the valve stem 62 is pushed by the small diameter portion 342 of the first piston shaft 34 and is in an open position P5, as shown in Figure 15, the fluid entering the switch seat 61 from the fluid input hole 612 It will not be blocked by the seal 63 and can flow to the fluid output hole 614 .

As shown in FIG. 2 , the second fluid switch 70 is provided at the connection between the sixth flow channel 28 and the seventh flow channel 29 . Furthermore, as shown in Figures 9 and 10, the second flow path switch 70 has a switch seat 71, a valve stem 72, a seal 73, and an elastic member 74, wherein the switch seat 71 has a fluid The input hole 712 and a fluid output hole 714, the fluid input hole 712 is connected to the sixth straight section 286 of the sixth flow channel 28, the fluid output hole 714 is connected to the seventh turning section 292 of the seventh flow channel 29; the valve stem 72 is provided on the switch The seat 71 also has a head 722 and a body 724 connecting the head 722. The end of the body 724 is exposed outside the switch seat 71 for the top 412a of the second piston shaft 41 to push up; the seal 73 is sleeved The body 724 of the valve stem 72 is located between the fluid input hole 712 and the fluid output hole 714; one end of the elastic member 74 presses against the top of the switch seat 71, and the other end of the elastic member 74 presses against the head of the valve stem 72. The portion 722 is used to provide elastic force to the valve stem 72 . Thereby, when the valve stem 72 is located at a closed position P4 (as shown in Figures 9 and 10) under the elastic force of the elastic member 74, the fluid input The fluid entering the switch seat 71 from the hole 712 will be blocked by the seal 73 and cannot flow to the fluid output hole 714. When the valve stem 72 is pushed by the top 412a of the second piston shaft 41 and is in an open position P5 ( As shown in FIGS. 21 and 22 ), the fluid entering the switch base 71 from the fluid input hole 712 will not be blocked by the seal 73 and can flow to the fluid output hole 714 .

As shown in FIG. 1 , the third fluid switch 80 is provided at the communication between the fifth flow channel 27 and the fluid outlet 228 . Furthermore, as shown in FIGS. 7 and 8 , the third flow channel switch 80 has a valve stem 81 , a seal 82 and an elastic member 83 , wherein the valve stem 81 is disposed in the fluid output groove 229 and has A head 812 and a body 814 connecting the head 812. The end of the body 814 passes through the fluid outlet 228 and protrudes into the groove 222 for the top 412b of the second piston shaft 41 to push; the seal 82 is set It is provided on the body 82 of the valve stem 81 and is adjacent to the fluid outlet 228; one end of the elastic member 83 is pressed against a groove cover 84 provided on the fluid output groove 229, and the other end of the elastic member 83 is pressed against the valve stem 81. The head 812 is used to provide elastic force to the valve stem 81 . Thereby, when the valve stem 81 is in a closed position P4 under the elastic force of the elastic member 83 (as shown in FIGS. 18 and 19 ), the fluid enters the fluid output groove 229 from the fifth turning section 274 of the fifth flow channel 27 The fluid is blocked by the seal 82 and cannot flow to the fluid outlet 228. When the valve stem 81 is pushed by the top 412b of the second piston shaft 41 and is in an open position P5 (as shown in Figures 7 and 8) , the fluid entering the fluid output groove 229 from the fifth turning section 274 of the fifth flow channel 27 will not be blocked by the seal 82 and can flow to the fluid outlet 228 .

It can be seen from the above that when the valve 53 is to be closed, as shown in FIG. 1 , the fluid is passed into the first flow channel 23 through the first joint 12 , and a part of the fluid will reach the first fluid switch 60 along the third flow channel 25 and wait. When the first fluid switch 60 is opened, another part of the fluid will enter the two first chambers 32 along the second straight sections 244 of the two second flow channels 24 (as shown in FIG. 5 ), causing the two first pistons to The unit 30 is pushed toward the valve port 212 by the fluid entering the two first chambers 32 (as shown in FIG. 13 ). At this time, one of the first piston shafts 34 will open the first fluid switch 60 to allow the fluid to flow. Pass through and flow to the fourth flow channel 26 (as shown in Figure 15 (shown), on the other hand, the two first piston shafts 34 drive the valve 53 to move from the first position P1 as shown in Figure 12 to the second position as shown in Figure 13 through the transmission seat 35 and the valve drive shaft 52 P2. Next, a part of the fluid passing through the first fluid switch 60 will reach the third fluid switch 80 from the fourth flow channel 26 along the fifth turning section 274 of the fifth flow channel 27, because at this time the third fluid switch 80 is located as shown in the figure. 8 shows the opening position P5, so the fluid reaching the third fluid switch 80 will be discharged from the fluid outlet 228 out of the valve seat 20 to complete the pressure relief. As for the other part of the fluid, it enters the two third chambers 43 along the fourth turning section 264 of the fourth flow channel 26 (as shown in Figure 7), so that the two second pistons 42 are simultaneously pushed into the two third chambers 43. The fluid in the three chambers 43 is pushed downward. At this time, the two second piston units 40 will drive the valve 53 to pivot from the second position P2 as shown in Figure 16 to the position as shown in Figure 16 through the transmission seat 35 and the valve drive shaft 52. The third position P3 shown in 17 enables the valve 53 to complete the sealing of the valve port 212. However, during the movement of the two second piston units 40, the pushing top 412b of the second piston shaft 41 will release the pushing force exerted on the valve stem 81 of the third fluid switch 80, causing the valve of the third fluid switch 80 to The rod 81 is closed by the elastic member 83 (as shown in Figures 18 and 19) to stop pressure relief.

On the contrary, when the valve 53 is to be opened, as shown in FIG. 2 , the fluid is introduced into the sixth flow channel 28 through the second joint 14 , and a part of the fluid will arrive along the sixth straight section 286 of the sixth flow channel 28 When the second fluid switch 70 waits for the second fluid switch 70 to be turned on, another part of the fluid will enter the two fourth chambers 44 along the two fifth straight sections 284 of the sixth flow channel 28, causing the two second pistons to 42 is pushed upward by the fluid entering the two fourth chambers 44 at the same time. At this time, the two second piston shafts 41 will drive the valve 53 from the third through the transmission seat 35 and the valve drive shaft 52 as shown in Figure 17 The position P3 returns to the second position P2 as shown in Figure 16, causing the valve 53 to release the tight seal on the valve port 212. During the movement of the two second piston units 40, one of the second piston shafts 41 pushes the valve stem 81 of the third fluid switch 80 with the push top 412b, causing the third fluid switch 80 to return to the position shown in Figure 8 In the open position P5, the other second piston shaft 41 pushes the valve stem 72 of the second fluid switch 70 with the push portion 412a (as shown in Figures 21 and 22), so that the second fluid switch 70 is opened to allow fluid to pass. Afterwards, the fluid passing through the second fluid switch 70 will reach the two second chambers 33 along the two eighth straight sections 296 of the seventh flow channel 29 (as shown in Figure 13), causing the first piston unit to 30 is pushed away from the valve port 212 by the fluid entering the second chamber 33 . When the first piston unit 30 moves in the direction away from the valve port 212, the first piston shaft 34 that originally resisted the valve stem 62 of the first fluid switch 60 will release the pushing force, causing the first fluid switch 60 to return. Go to the closed position P4 as shown in Figure 6. At the same time, the two first piston shafts 34 will drive the valve 53 from the second position P2 shown in Figure 16 back to the first position P1 shown in Figure 12 through the transmission seat 35 and the valve driving shaft 52, so that Valve 53 is completely opened. In addition, the fluid located in the two first chambers 32 will be pushed by the two first pistons 31 and return to the first flow channel 23 along the second flow channel 24, as shown in Figure 23, and then from the first joint 12 Discharge the valve seat 20 to complete the pressure relief.

What needs to be supplemented here is that, as shown in Figures 5 and 23, the valve seat 20 further has a buffer channel 90. The buffer channel 90 is connected between the first flow channel 23 and the second flow channel 24, and has a flow rate greater than that of the first flow channel 90. The channel 23 and the second flow channel 24 have larger outer diameters. A plug 91 , an elastic member 92 and a seal 93 are provided in the buffer channel 90 . The plug 91 is located between the buffer channel 90 and the first flow channel 23 and is not completely airtight with the buffer channel 90 and the first flow channel 23 . Closely, one end of the elastic member 92 abuts the junction of the buffer channel 90 and the second flow channel 24 , and the other end of the elastic member 92 abuts the plug head 91 to provide elastic force to push the plug head 91 toward the first flow channel 23 Direction push. Therefore, when the pressure exerted by the fluid on the plug head 91 is greater than the pressure exerted by the elastic member 92 on the plug head 91 , the fluid can flow from the first flow channel 23 through the buffer channel 90 to the second flow channel 24 , and then from the second flow channel 23 to the second flow channel 24 . The flow channel 24 reaches the first chamber 32; on the contrary, when the fluid flows from the first chamber 32 to the second flow channel 24 and reaches the buffer channel 90, the fluid will follow the gap between the plug head 91 and the buffer channel 90 Slowly flows to the first flow channel 23, and then is discharged from the first flow channel 23 through the first joint 12 to the outside of the valve seat 20. This can buffer the discharge pressure of the fluid and prevent the valve 53 from opening too quickly.

To sum up, the gate valve 10 of the present invention is provided with multiple flow channel switches 60, 70, 80 at different positions inside the valve seat 20 to control the flow of fluid, so that the pressure provided by the fluid can reliably drive the first piston unit 30 and the second piston unit 40, thereby accurately driving the valve 53 to close or open the valve port 212, so as to improve the accuracy of the operation and ensure the air-tight effect.

10: Gate valve

12:First connector

20: Valve seat

21:First ontology

212: Valve port

22:Second body

226: Fluid inlet and outlet

23:First flow channel

24:Second flow channel

242: First straight line segment

244: Second straight line segment

25:Third channel

252: The third straight line segment

254: The first turning point

256: The second turning section

26:Fourth channel

262: The third turning section

264: The fourth turning point

27:Fifth flow channel

272: The fourth straight line segment

274: The fifth turning point

60: First fluid switch

80:Third fluid switch

Claims (10)

A gate valve including: A valve seat has a valve port, an axis hole, a receiving groove, a first piston groove and a second piston groove. An axial direction of the shaft hole is perpendicular to an opening direction of the valve port. The receiving groove is located on the valve. Between the port and the shaft hole, the first piston groove is adjacent to the shaft hole, and the axial direction of the first piston groove is perpendicular to the opening direction of the valve port, and the second piston groove is adjacent to the receiving groove , and the axial direction of the second piston groove is parallel to the opening direction of the valve port, and the valve seat has a fluid inlet and outlet, a fluid inlet, a fluid outlet, a first flow channel connected to the fluid inlet and outlet, and a first flow channel connected to the fluid inlet and outlet. a second flow channel of the first flow channel, a third flow channel connected to the first flow channel, a fourth flow channel connected to the third flow channel, and a fifth flow channel connected to the fourth flow channel and the fluid outlet , a sixth flow channel connected to the fluid inlet, and a seventh flow channel connected to the sixth flow channel, wherein the first flow channel, the second flow channel, the third flow channel, and the fourth flow channel , the fifth flow channel, the sixth flow channel and the seventh flow channel are all used for a fluid to pass; A first piston unit has a first piston, a first piston shaft and a transmission seat. The first piston is displaceably located in the first piston groove of the valve seat. One end of the first piston and the A first chamber connected to the second flow channel is formed between one end wall of the first piston groove, so that the first piston can be driven by the fluid entering the first chamber along the first piston groove. The axis moves in the direction of the valve port, and a second chamber connected to the seventh flow channel is formed between an outer peripheral surface of the first piston and a peripheral wall of the first piston groove, so that the first piston can Driven by the fluid entering the second chamber, the first piston shaft moves along the axial direction of the first piston groove in a direction away from the valve port, and the first piston shaft is partially exposed in the groove of the valve seat and One end thereof is connected to the first piston, so that the first piston shaft can be driven by the first piston to reciprocate along the axial direction of the first piston groove, and the transmission seat can move along the first piston groove. The axial displacement method is provided in the groove of the valve seat and is connected to the first piston shaft in a axial displacement manner along the second piston groove, so that the transmission seat can be affected by the first piston shaft. The piston shaft is driven to reciprocate along the axial direction of the first piston groove; A second piston unit has a second piston shaft and a second piston. The second piston shaft is embedded in the transmission seat and allows the transmission seat to move relative to it along the axial direction of the first piston groove, The second piston is displaceably disposed in the second piston groove of the valve seat and connected to the second piston shaft. Two opposite end surfaces of the second piston and two opposite end walls of the second piston groove are respectively formed between A third chamber connected to the fourth flow channel and a fourth chamber connected to the sixth flow channel, so that the second piston can be driven by the fluid entering the third chamber to pass through the third chamber. The two piston shafts push the transmission seat along the axis of the second piston groove in a direction away from the first piston shaft. On the other hand, they can be driven by the fluid entering the fourth chamber through the second piston shaft. The piston shaft pulls the transmission seat along the axis of the second piston groove in the direction of the first piston shaft; A valve unit has a pivot seat, a valve drive shaft and a valve. The pivot seat is displaceably located in the shaft hole of the valve seat. The valve drive shaft is fixed to the drive seat and passes through one end of the valve seat. The shaft hole provided in the valve seat is pivotally connected to the pivot seat so that the valve driving shaft can move synchronously with the transmission seat. The valve is connected to the valve driving shaft so that the valve can drive the valve through the valve driving shaft. The axial displacement causes the displacement between a first position that opens the valve port and a second position that covers the valve port, and can be in close contact with a valve at the second position through the pivoting of the valve drive shaft. The displacement between the third position of the valve port; and A first flow channel switch is provided at at least one of the connection between the third flow channel and the fourth flow channel and the connection between the sixth flow channel and the seventh flow channel. When the flow channel switch is turned on This allows the fluid to pass through. The gate valve according to claim 1, wherein the flow channel switch is provided at the connection between the third flow channel and the fourth flow channel. The gate valve of claim 2, wherein the flow path switch is a first flow path switch, and the first flow path switch has a switch seat, a valve stem, a seal set on the valve stem, and an elastic The switch seat has a fluid input hole connected to the third flow channel and a fluid output hole connected to the fourth flow channel. The valve stem is located in the switch seat and can be driven by the first piston shaft. Moving from a closed position to an open position, when the valve stem is in the closed position, the fluid entering the switch seat from the fluid input hole is blocked by the seal and cannot flow to the fluid output hole. When the valve stem is in the open position, the fluid entering the switch seat from the fluid input hole will not be blocked by the seal and can flow to the fluid output hole. The elastic member acts on the valve stem and provides elastic force to move the valve stem. The valve stem remains in this closed position. The gate valve according to claim 1, wherein the flow channel switch is provided at the connection between the sixth flow channel and the seventh flow channel. The gate valve of claim 4, wherein the flow path switch is a second flow path switch, and the second flow path switch has a switch seat, a valve stem, a set of seals arranged on the valve stem, and An elastic member, the switch seat has a fluid input hole connected to the sixth flow channel and a fluid output hole connected to the seventh flow channel, the valve stem is located in the switch seat and can be pressed by the second piston shaft Driven to move from a closed position to an open position, when the valve stem is in the closed position, the fluid entering the switch seat from the fluid input hole is blocked by the seal and cannot flow to the fluid output hole, When the valve stem is in the open position, the fluid entering the switch seat from the fluid input hole will not be blocked by the seal and can flow to the fluid output hole. The elastic member acts on the valve stem and provides elastic force. Keep the valve stem in the closed position. The gate valve as claimed in claim 1, wherein a flow channel switch is respectively provided at the connection point between the third flow channel and the fourth flow channel and at the connection point between the sixth flow channel and the seventh flow channel. The gate valve according to claim 6, wherein the flow channel switch provided at the connection between the third flow channel and the fourth flow channel is a first flow channel switch, and the first flow channel switch has a switch base, A valve stem, a set of seals arranged on the valve stem, and an elastic member. The switch seat has a fluid input hole connected to the third flow channel and a fluid output hole connected to the fourth flow channel. The valve The rod is disposed in the switch seat and can be driven by the first piston shaft to move from a closed position to an open position. When the valve rod is in the closed position, the valve rod enters the switch seat from the fluid input hole. The fluid is blocked by the seal and cannot flow to the fluid output hole. When the valve stem is in the open position, the fluid entering the switch seat from the fluid input hole is not blocked by the seal and can flow to The fluid output hole, the elastic member acts on the valve stem and provides elastic force to keep the valve stem in the closed position; the flow channel switch provided at the connection between the sixth flow channel and the seventh flow channel is a The second flow channel switch has a switch seat, a valve stem, a sealing member provided on the valve stem, and an elastic member. The switch seat has a fluid connection to the sixth flow channel. The input hole and a fluid output hole connected to the seventh flow channel, the valve stem is located in the switch seat and can be driven by the second piston shaft to move from a closed position to an open position. When the valve stem is located In the closed position, the fluid entering the switch seat from the fluid input hole is blocked by the seal and cannot flow to the fluid output hole. When the valve stem is in the open position, the fluid entering the switch from the fluid input hole The fluid in the seat will not be blocked by the sealing member and can flow to the fluid output hole. The elastic member acts on the valve stem and provides elastic force to keep the valve stem in the closed position. The gate valve according to any one of claims 1 to 7, wherein a third flow channel switch is provided at a communication point between the fifth flow channel and the fluid outlet. The gate valve of claim 8, wherein the valve seat has a fluid output groove connecting the fifth flow channel and the fluid outlet, and the third flow channel switch has a valve stem and is sleeved on the valve stem. The sealing member and an elastic member, the valve stem is located in the fluid output groove and can be driven by the second piston shaft to move from a closed position to an open position. When the valve stem is in the closed position, from The fluid entering the fluid output groove from the fifth flow channel is blocked by the seal and cannot flow to the fluid outlet. When the valve stem is in the open position, the fluid entering the fluid output groove from the fifth flow channel The fluid can flow to the fluid outlet without being blocked by the sealing member. The elastic member acts on the valve stem and provides elastic force to keep the valve stem in the closed position. The gate valve of claim 1, wherein the valve seat further has a buffer channel connected between the first flow channel and the second flow channel, and a plug and an elastic member are disposed in the buffer channel , the plug head is located between the buffer channel and the first flow channel, and the elastic member acts on the plug head and provides elastic force to push the plug head toward the direction of the first flow channel.

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