Valve terminal with pilot protection function

Abstract

This invention relates to the field of pneumatic control technology and provides a valve island with pilot protection function, including a manifold, a pilot switch valve, a first valve plate, and a second valve plate. The manifold has a main air intake channel and a pilot air intake channel. The pilot switch valve is disposed on the manifold and is used to control the air passage between the main air intake channel and the pilot air intake channel. At least one first valve plate is disposed on the manifold and has a pilot air intake port A. At least one second valve plate is disposed on the manifold and has a pilot air intake port B. The pilot air intake port A is connected to the pilot air intake channel. The pilot air intake port B is connected to the main air intake channel. The pilot air for the first valve plate is supplied by the pilot switch valve, and the pilot air for the second valve plate is supplied by the main air intake channel of the manifold. When the first valve plate does not need to work, the pilot air supply to the first valve plate is directly cut off by the pilot switch valve. The first valve plate can also be supplied by an external pilot air source.

Description

Technical Field

[0001] This invention relates to the field of pneumatic control technology, and in particular to a valve island with pilot protection function. Background Technology

[0002] A valve island is a combined control module that integrates multiple solenoid valves, enabling centralized control of multiple pneumatic circuits and is widely used in industrial automated production lines.

[0003] Currently available integrated valve islands typically feature a manifold with an integrated air intake channel. In most valve islands, the pilot air source for all integrated valves is uniformly supplied through this channel. Specifically, each valve has a pilot air inlet, connected to the air intake channel, providing the pilot air source. This pilot air source drives the valve stem within the valve, controlling the airflow within the valve. In real-world scenarios, the multiple valves integrated into a valve island often have different operating requirements. Some valves need to respond to control commands constantly, while others operate intermittently, activated only during specific phases and remaining in standby mode the rest of the time. For valves that do not require operation for extended periods, their pilot air inlets remain connected to the air intake channel, easily leading to wasted compressed air. Furthermore, since all valves in such valve islands rely on a single air intake channel for pilot air supply, troubleshooting requires shutting down the entire valve island's air intake channel, causing all valves to stop working, resulting in a production line shutdown and significant production losses. Furthermore, the pilot air source for all valve plates integrated in this valve island is uniformly supplied by the intake channel. When the air source pressure in the intake channel fluctuates or drops, the pilot air source supplied by the intake channel will also be affected simultaneously. Therefore, it is necessary to make improvements. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings and deficiencies of existing technologies by providing a valve island with pilot protection function. This valve island has a simple and reasonable structure and is easy to operate. The pilot switch valve controls the airflow between the main intake channel and the pilot intake channel. When the pilot switch valve is open, the air source in the main intake channel can be connected to the pilot intake channel, achieving internal pilot air supply. When the first valve plate malfunctions or is not required to operate, the pilot switch valve can be closed, cutting off the connection between the main intake channel and the pilot intake channel. Furthermore, in this application, when the pilot switch valve is closed, an external pilot air source can be independently supplied to the pilot intake channel. In this case, the gas in the pilot intake channel comes entirely from the external air source and does not interact with the air source in the main intake channel.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: The valve island with pilot protection function according to the present invention includes: The manifold has a main intake passage and a pilot intake passage; A pilot switch valve, located on the manifold, is used to control the opening and closing of the air passage between the main intake passage and the pilot intake passage; At least one first valve plate is disposed on the manifold, and the first valve plate is provided with a pilot air inlet A; At least one second valve plate is disposed on the manifold, and the second valve plate is provided with a pilot air inlet B; The pilot air inlet A is connected to the pilot air inlet channel; The pilot air inlet B is connected to the main air intake channel.

[0006] Optionally, the pilot switching valve includes a first pilot valve, a switching valve body, and a switching valve stem; The switching valve body has a first valve chamber, a first air inlet and a first air outlet. The first air inlet and the first air outlet are both connected to the first valve chamber. The first air inlet is connected to the main air inlet channel and the first air outlet is connected to the pilot air inlet channel. The switch valve stem is movably disposed within the first valve chamber; The first pilot valve is disposed on the switch valve body. The first pilot valve is used to drive the switch valve stem to move in order to control the opening and closing of the air passage between the first air inlet and the first air outlet.

[0007] Optionally, the switch valve stem has a first position and a second position within the first valve chamber; When the switch valve stem is in the first position, the air passage between the first air inlet and the first air outlet is connected. When the switch valve stem is in the second position, the air passage between the first air inlet and the first air outlet is disconnected.

[0008] Optionally, the direction of movement of the switch valve stem is defined as a first direction. Along the first direction, the switch valve stem has a first end and a second end, and the first valve chamber includes a first chamber and a second chamber. A first piston is movably disposed in the first chamber, which divides the first chamber into chamber A and chamber B. The first end is located in chamber B, and the second end is located in the second chamber. The pilot switching valve also includes a first elastic element, which causes the valve stem to always have a tendency to move toward the second position.

[0009] Optionally, the first pilot valve has a pilot inlet C and a pilot outlet C, wherein the pilot inlet C is connected to the main inlet channel and the pilot outlet C is connected to the chamber A; The first pilot valve has a first operating state and a second operating state; When the first pilot valve is in the first working state, the air passage between the pilot air inlet C and the pilot air outlet C is connected. When the first pilot valve is in the second working state, the air passage between the pilot air inlet C and the pilot air outlet C is disconnected.

[0010] Optionally, the switch valve body is provided with a first air inlet, the first air inlet is connected to the main air inlet channel, and the switch valve body is provided with a first air inlet path, the air inlet end of the first air inlet path is connected to the first air inlet. The first air intake path includes a first branch and a second branch. The outlet of the first branch is connected to the pilot air inlet C, and the outlet of the second branch is connected to the second chamber.

[0011] Optionally, the switching valve body includes a first valve block and a second valve block; The first air inlet, the first air outlet, the first valve chamber, the first air inlet hole, and the first air inlet passage are all located inside the first valve block; The second valve block is provided with a second air intake passage, and the air intake end of the second air intake passage is connected to the main air intake channel; The second air intake path includes a third branch and a fourth branch. The outlet of the third branch is connected to the first air intake hole, and the outlet of the fourth branch is connected to the first air intake hole.

[0012] Optionally, a receiving groove is provided in the second end, the first elastic element is located in the receiving groove, a guide element that cooperates with the first elastic element is provided in the second chamber, a groove portion that cooperates with the guide element is provided in the switch valve body, one end of the guide element is located in the groove portion, and the other end of the guide element extends into the receiving groove and abuts against the first elastic element.

[0013] Optionally, the first valve plate includes a second pilot valve, a first valve body, and a first valve stem; the second pilot valve is provided with the pilot air inlet A; the first valve stem is movably disposed within the first valve body; The first valve body is provided with a second air inlet and a second air inlet, the pilot air inlet channel is connected to the second air inlet, and the main air inlet channel is connected to the second air inlet; The first valve body is provided with a third air intake passage, which connects the second air intake port and the pilot air intake port A.

[0014] Optionally, the second valve plate includes a third pilot valve, a second valve body, a third valve body, and a second valve stem; the third pilot valve is provided with the pilot air inlet B; the second valve stem is movably disposed within the second valve body; The second valve body is provided with a third air inlet and a third air outlet, and a fourth air inlet passage is provided inside the second valve body, the fourth air inlet passage connecting the third air inlet and the pilot air inlet B; The third valve body is provided with a fifth air intake passage, the air intake end of which is connected to the main air intake channel; the fifth air intake passage includes a fifth branch and a sixth branch, the air outlet end of the fifth branch is connected to the third air intake port, and the air outlet end of the sixth branch is connected to the third air intake port. The beneficial effects of the present invention are as follows: In this application, the pilot switch valve is used to control the air passage between the main air intake passage and the pilot air intake passage. When the pilot switch valve is open, the air source in the main air intake passage can be connected to the pilot air intake passage to realize internal pilot air supply; when the pilot switch valve is closed, the connection between the main air intake passage and the pilot air intake passage is cut off.

[0015] In this application, the first and second valve plates operate independently. When the first valve plate malfunctions, its pilot air supply can be directly cut off via the pilot switch valve, isolating the fault without affecting the normal operation of the second valve plate and reducing downtime losses. Furthermore, during maintenance, commissioning personnel can close the pilot switch valve and maintain the first valve plate separately without affecting the normal operation of the second valve plate, reducing commissioning difficulty and shortening the commissioning cycle.

[0016] In addition, in this application, when the pilot switch valve is in the closed state, an external pilot air source can be independently introduced into the pilot air intake channel. At this time, the gas in the pilot air intake channel comes entirely from the external air source and does not interact with the air source of the main air intake channel. Attached Figure Description

[0017] Figure 1 This is a structural schematic diagram of the present invention from a first perspective; Figure 2 This is a structural schematic diagram of the present invention from a second perspective; Figure 3 This is a schematic diagram of the first cross-sectional structure of the present invention; Figure 4 This is a schematic diagram of the second cross-sectional structure of the present invention; Figure 5 yes Figure 4 Enlarged structural diagram at point A; Figure 6 This is a schematic diagram of the third cross-sectional structure of the present invention; Figure 7 This is a schematic diagram of the fourth cross-sectional structure of the present invention.

[0018] Figures 1-7 middle: 1. Manifold; 11. Main intake passage; 12. Pilot intake passage; 2. Pilot switch valve; 21. First pilot valve; 211. Pilot intake port C; 22. Switch valve body; 221. First valve chamber; 222. First chamber; 2221. First piston; 2222. Chamber A; 2223. Chamber B; 223. Second chamber; 2231. Guide component; 224. First valve block; 2241. First intake port; 2242. First outlet port ; 2243, First air inlet; 225, Second valve block; 226, First air inlet path; 2261, First branch path; 2262, Second branch path; 227, Second air inlet path; 2271, Third branch path; 2272, Fourth branch path; 23, Switch valve stem; 231, First end; 232, Second end; 2321, Receiving groove; 233, First elastic element; 3, First valve plate; 31, Pilot air inlet A; 32, Second pilot valve; 3 3. First valve body; 331. Second air inlet; 332. Second air inlet port; 333. Third air inlet path; 3331. Seventh branch path; 3332. Eighth branch path; 334. Third chamber; 3341. Second piston; 3342. Chamber C; 3343. Chamber D; 335. Fourth chamber; 34. First valve stem; 341. Second elastic element; 4. Second valve plate; 41. Pilot air inlet B; 42. Third pilot valve; 43. Second valve body ; 431, Third air inlet; 432, Third air inlet; 433, Fourth air inlet passage; 4331, Ninth branch passage; 4332, Tenth branch passage; 434, Fifth chamber; 4341, Third piston; 4342, Chamber E; 4343, Chamber F; 435, Sixth chamber; 44, Third valve body; 441, Fifth air inlet passage; 4411, Fifth branch passage; 4412, Sixth branch passage; 45, Second valve stem; 451, Third elastic element. Detailed Implementation

[0019] The invention will now be further described with reference to the accompanying drawings.

[0020] like Figures 1-7The valve island shown includes a manifold 1, a pilot switch valve 2, a first valve plate 3, and a second valve plate 4. The manifold 1 has a main intake channel 11 and a pilot intake channel 12. The pilot switch valve 2 is disposed on the manifold 1 and is used to control the air passage between the main intake channel 11 and the pilot intake channel 12. At least one first valve plate 3 is disposed on the manifold 1 and has a pilot intake port A31. At least one second valve plate 4 is disposed on the manifold 1 and has a pilot intake port B41. The pilot intake port A31 is connected to the pilot intake channel 12. The pilot intake port B41 is connected to the main intake channel 11. Specifically, the air source in the main intake channel 11 is output to two air paths. One path is directly connected to the pilot air inlet B41 of all the second valve plates 4 to provide pilot air source for the second valve plates 4. The other path enters the pilot intake channel 12 through the pilot switch valve 2, and then is distributed to the pilot air inlet A31 of all the first valve plates 3 through the pilot intake channel 12.

[0021] In traditional integrated valve islands, all valves are supplied with pilot air from the same main pilot channel. If only some valves need to work while others are on standby, the standby valves will continue to consume pilot air, resulting in wasted air.

[0022] In this application, the pilot switch valve 2 is used to control the air passage connection between the main intake channel 11 and the pilot intake channel 12. When the pilot switch valve 2 is open, the air source in the main intake channel 11 can be connected to the pilot intake channel 12 to achieve internal pilot air supply. When the pilot switch valve 2 is closed, the connection between the main intake channel 11 and the pilot intake channel 12 is cut off. The pilot air source of the second valve plate 4 is supplied by the main intake channel 11 of the manifold 1. The first valve plate 3 and the second valve plate 4 work independently. When the first valve plate 3 does not need to work, the pilot air source of the first valve plate 3 is directly cut off by the pilot switch valve 2, avoiding the ineffective air consumption of the first valve plate 3.

[0023] More specifically, in this application, the pilot air source of the first valve plate 3 is controlled by the pilot switch valve 2. The pilot switch valve 2 is opened to supply air only when the first valve plate 3 needs to be activated. When it is not needed, the pilot air source of the first valve plate 3 can be directly cut off. The second valve plate 4 is mostly a valve plate in the valve island system that needs to maintain a working state for a long time. The second valve plate 4 is directly supplied with pilot air by the main air intake channel 11 to maintain a state of always responding.

[0024] In addition, during the maintenance phase, the commissioning personnel can close the pilot switch valve 2 and maintain the first valve plate 3 separately without affecting the normal operation of the second valve plate 4, which can reduce the difficulty of commissioning, shorten the commissioning cycle, and reduce downtime losses.

[0025] This structural design reduces the waste of air source for the first valve plate 3, which operates intermittently.

[0026] In this application, the pressure requirements of the first valve plate 3 and the second valve plate 4 for the pilot gas source can be the same or different.

[0027] In this embodiment, the first valve plate 3 and the second valve plate 4 can have the same pressure requirement for the pilot gas source.

[0028] In other embodiments, the first valve plate 3 and the second valve plate 4 may have different pilot air source pressure requirements. By adding a pressure regulating structure at the pilot air intake channel 12, the pilot air source pressure of the first valve plate 3 can be adjusted to match its specific pilot pressure requirements; while the second valve plate 4 directly draws air source pressure from the main air intake channel 11. This differentiated air supply allows both the first valve plate 3 and the second valve plate 4 to operate under optimal pilot pressure conditions, effectively extending their service life.

[0029] In one embodiment, the valve island can be configured with an external pilot air source. When the pilot switch valve 2 is in the closed state, an external pilot air source can be independently introduced into the pilot air intake channel 12. At this time, the gas in the pilot air intake channel 12 comes entirely from the external air source and does not interact with the air source of the main air intake channel 11. In the event of pressure fluctuations or unexpected pressure drops in the main air intake channel 11, the first valve plate 3 can maintain the normal pilot air source pressure.

[0030] Preferably, in this embodiment, refer to Figures 3-5 The pilot valve 2 includes a first pilot valve 21, a switch valve body 22, and a switch valve stem 23. The switch valve body 22 has a first valve chamber 221, a first air inlet 2241, and a first air outlet 2242. The first air inlet 2241 and the first air outlet 2242 are both connected to the first valve chamber 221. The first air inlet 2241 is connected to the main air intake channel 11, and the first air outlet 2242 is connected to the pilot air intake channel 12.

[0031] The switch valve stem 23 is movably disposed within the first valve chamber 221. Preferably, in this embodiment, the switch valve stem 23 has a first position and a second position within the first valve chamber 221. When the switch valve stem 23 is in the first position, the air passage between the first air inlet 2241 and the first air outlet 2242 is connected. When the switch valve stem 23 is in the second position, the air passage between the first air inlet 2241 and the first air outlet 2242 is disconnected.

[0032] The first pilot valve 21 is disposed on the switch valve body 22. The first pilot valve 21 is used to drive the switch valve stem 23 to move, so as to control the air passage between the first air inlet 2241 and the first air outlet 2242. The air passage on / off control is achieved by driving the switch valve stem 23 through the first pilot valve 21. Compared with the traditional manual switch valve, the control response speed is faster.

[0033] Preferably, in this embodiment, the moving direction of the switch valve stem 23 is defined as the first direction. In this embodiment, the first direction is also the axial direction of the switch valve stem 23. Along the first direction, the switch valve stem 23 has a first end 231 and a second end 232. The first valve cavity 221 includes a first chamber 222 and a second chamber 223. A first piston 2221 is movably disposed in the first chamber 222. The first piston 2221 divides the first chamber 222 into chamber A2222 and chamber B2223. The first end 231 is located in chamber B2223. When there is gas in chamber A2222, it pushes the first piston 2221 to move. The first piston 2221 abuts against the switch valve rod 23, thereby pushing the switch valve rod 23 to move to the first position. The pilot switch valve 2 also includes a first elastic element 233. The first elastic element 233 makes the switch valve stem 23 always have a tendency to move towards the second position. In this embodiment, the first elastic element 233 is a spring. The spring provides a reset preload force for the switch valve stem 23, which can actively push the switch valve stem 23 to the second position to avoid excessive residual gas resistance, which would cause the switch valve stem 23 to fail to reset properly.

[0034] Preferably, in this embodiment, a receiving groove 2321 for accommodating the first elastic member 233 is provided in the second end 232, the first elastic member 233 is located in the receiving groove 2321, a guide member 2231 that cooperates with the first elastic member 233 is provided in the second chamber 223, a groove portion that cooperates with the guide member 2231 is provided in the switch valve body 22, one end of the guide member 2231 is located in the groove portion, and the other end of the guide member 2231 extends into the receiving groove 2321 and abuts against the first elastic member 233, and the switch valve stem 23 can move relative to the guide member 2231.

[0035] The first elastic element 233 is located inside the switch valve stem 23, eliminating the need for additional spring mounting space outside the first valve cavity 221, which is beneficial for miniaturization and compactness.

[0036] In addition, the receiving groove 2321 forms a circumferential limiting constraint on the first elastic member 233, which can limit the radial movement and bending deviation of the first elastic member 233 when it is under pressure.

[0037] Preferably, in this embodiment, the first pilot valve 21 has a pilot air inlet C211 and a pilot air outlet C. The pilot air inlet C211 is connected to the main air intake channel 11, and the pilot air outlet C is connected to the chamber A2222. The pilot air source of the first pilot valve 21 is directly supplied by the main air intake channel 11 of the manifold 1.

[0038] The first pilot valve 21 has a first operating state and a second operating state. In this embodiment, the first operating state is an energized state, and the second operating state is a de-energized state. When the first pilot valve 21 is in the first operating state, the air passage between the pilot inlet C211 and the pilot outlet C is connected. When the first pilot valve 21 is in the second operating state, the air passage between the pilot inlet C211 and the pilot outlet C is disconnected. By controlling the air intake and de-energization of the chamber A2222 through the first pilot valve 21, the position switching of the valve stem 23 can be completed simply by switching the operating state of the first pilot valve 21.

[0039] Preferably, in this embodiment, the switch valve body 22 is provided with a first air inlet 2243, which is connected to the main air intake channel 11. Air is directly introduced into the first air inlet 2243 through the main air intake channel 11 of the manifold 1. The switch valve body 22 is provided with a first air intake passage 226, the air intake end of which is connected to the first air inlet 2243. Gas in the main air intake channel 11 flows into the first air intake passage 226 through the first air inlet 2243.

[0040] See Figure 5 The first air intake passage 226 includes a first branch 2261 and a second branch 2262. The outlet of the first branch 2261 is connected to the pilot air inlet C211 to provide a pilot air source for the first pilot valve 21. The outlet of the second branch 2262 is connected to the second chamber 223 to supply air to the second chamber 223. The switch valve stem 23 is subjected to air pressure and the elastic force of the first elastic element 233, which enables it to move to the second position more quickly and has a faster response speed.

[0041] More specifically, the cross-sectional area of ​​the first piston 2221 facing the chamber A2222 is larger than the cross-sectional area of ​​the second end 232 facing the second chamber 223. When the first pilot valve 21 is in the first working state, it supplies gas to the chamber A2222. When there is gas pressure in the chamber A2222, the switch valve stem 23 can overcome the elastic force of the first elastic element 233 and the pressure of the second chamber 223 and move towards the first position.

[0042] When the first pilot valve 21 is in the second working state, the gas supply to chamber A2222 is stopped. The switch valve stem 23 is moved to the second position by the air pressure in the second chamber 223 and the elastic force of the first elastic element 233. Preferably, the gas in chamber A2222 can be discharged. In one embodiment, the first pilot valve 21 is provided with a first exhaust channel, which is connected to chamber A2222 and is used to discharge the gas remaining in chamber A2222. Specifically, when the first pilot valve 21 is in the first working state, the first exhaust channel is closed. When the first pilot valve 21 is in the second working state, the first exhaust channel is opened, and the compressed air remaining in chamber A2222 will be discharged into the atmosphere through the first exhaust channel connected inside the first pilot valve 21.

[0043] Preferably, in this embodiment, refer to Figure 4 The switch valve body 22 includes a first valve block 224 and a second valve block 225. The first air inlet 2241, the first air outlet 2242, the first valve chamber 221 and the first air inlet passage 226 are all located in the first valve block 224. The second valve block 225 is provided with a second air inlet passage 227. The air inlet end of the second air inlet passage 227 is connected to the main air inlet channel 11. The second air inlet passage 227 includes a third branch 2271 and a fourth branch 2272. The air outlet end of the third branch 2271 is connected to the first air inlet hole 2243, and the air outlet end of the fourth branch 2272 is connected to the first air inlet 2241. The main air inlet channel 11 supplies air to the first pilot valve 21 and the first air inlet 2241 of the switch valve body 22 through the second air inlet passage 227.

[0044] Preferably, in this embodiment, refer to Figure 6 The first valve plate 3 includes a second pilot valve 32, a first valve body 33, and a first valve stem 34. The second pilot valve 32 is provided with a pilot air inlet A31 and a pilot air outlet A. A second valve chamber is provided inside the first valve body 33, and the first valve stem 34 is movably disposed in the second valve chamber. The second pilot valve 32 is disposed on the first valve body 33 and is used to drive the first valve stem 34 to move. The first valve body 33 is provided with a second air inlet 331, a second air outlet 332, and a second air outlet. The pilot air inlet channel 12 is connected to the second air inlet 331, and the main air inlet channel 11 is connected to the second air outlet 332. A third air inlet passage 333 is provided inside the first valve body 33, and the third air inlet passage 333 is connected to the second air inlet 331 and the pilot air inlet A31.

[0045] Pilot air is supplied to the second pilot valve 32 through the pilot intake channel 12, and air is supplied to the second intake port 332 of the first valve body 33 through the main intake channel 11.

[0046] Specifically, the second pilot valve 32 has a third working state and a fourth working state. In this embodiment, the third working state is the energized state and the fourth working state is the de-energized state. When the second pilot valve 32 is in the third working state, the air passage between the pilot inlet A31 and the pilot outlet A is connected. When the second pilot valve 32 is in the fourth working state, the air passage between the pilot inlet A31 and the pilot outlet A is disconnected.

[0047] Preferably, in this embodiment, the first valve stem 34 has a third position and a fourth position in the second valve chamber; when the first valve stem 34 is in the third position, the air passage between the second air inlet 332 and the second air outlet is connected; when the first valve stem 34 is in the fourth position, the air passage between the second air inlet 332 and the second air outlet is disconnected.

[0048] The direction of movement of the first valve stem 34 is defined as the second direction. In this embodiment, the second direction is also the axial direction of the first valve stem 34. Along the second direction, the first valve stem 34 has a third end and a fourth end. The second valve chamber includes a third chamber 334 and a fourth chamber 335. A second piston 3341 is movably disposed in the third chamber 334. The second piston 3341 divides the third chamber 334 into chamber C3342 and chamber D3343. The third end is located in chamber D3343. The gas outlet A is first connected to chamber C3342. When there is gas in chamber C3342, it pushes the second piston 3341 to move. The second piston 3341 abuts against the first valve stem 34, thereby pushing the first valve stem 34 to move to the third position.

[0049] More specifically, the air intake end of the third air intake passage 333 is connected to the second air intake port 331. The third air intake passage 333 includes a seventh branch 3331 and an eighth branch 3332. The air outlet end of the seventh branch 3331 is connected to the pilot air inlet A31 to provide a pilot air source for the second pilot valve 32. The air outlet end of the eighth branch 3332 is connected to the fourth chamber 335 to supply air to the fourth chamber 335. The first valve plate 3 also includes a second elastic element 341. The second elastic element 341 makes the first valve stem 34 always have a tendency to move towards the fourth position. The first valve stem 34 is subjected to air pressure and the elastic force of the second elastic element 341, which enables it to move to the fourth position more quickly and has a faster response speed.

[0050] More specifically, the cross-sectional area of ​​the second piston 3341 facing the chamber C3342 is larger than the cross-sectional area of ​​the fourth end facing the fourth chamber 335. When the second pilot valve 32 is in the third working state, it supplies air to the chamber C3342, and the first valve stem 34 can overcome the elastic force of the second elastic element 341 and the pressure of the fourth chamber 335 to move to the third position.

[0051] Preferably, the gas in chamber C3342 can be discharged. In one embodiment, a second exhaust passage is provided in the second pilot valve 32, which is connected to chamber C3342 and is used to discharge the gas remaining in chamber C3342. Specifically, when the second pilot valve 32 is in the third working state, the second exhaust passage is closed, and when the second pilot valve 32 is in the fourth working state, the second exhaust passage is opened, and the compressed air remaining in chamber C3342 is discharged into the atmosphere through the second exhaust passage.

[0052] Preferably, in this embodiment, refer to Figure 7 The second valve plate 4 includes a third pilot valve 42, a second valve body 43, a third valve body 44, and a second valve stem 45. The third pilot valve 42 is provided with a pilot air inlet B41 and a pilot air outlet B. The second valve body 43 is provided with a third valve chamber, and the second valve stem 45 is movably disposed in the third valve chamber. The third pilot valve 42 is used to drive the second valve stem 45 to move. The second valve body 43 is provided with a third air inlet 431, a third air outlet 432, and a third air outlet. The third valve body 44 is provided with a fifth air inlet passage 441. The air inlet end of the fifth air inlet passage 441 is connected to the main air inlet channel 11. The fifth air inlet passage 441 includes a fifth branch 4411 and a sixth branch 4412. The air outlet end of the fifth branch 4411 is connected to the third air inlet 431, and the air outlet end of the sixth branch 4412 is connected to the third air inlet 432. Air is supplied to the third pilot valve 42 and the third air inlet 432 of the second valve body 43 through the main air intake passage 11.

[0053] Specifically, the third pilot valve 42 has a fifth operating state and a sixth operating state. In this embodiment, the fifth operating state is the energized state and the sixth operating state is the de-energized state. When the third pilot valve 42 is in the fifth operating state, the air passage between the pilot inlet B41 and the pilot outlet B is connected. When the third pilot valve 42 is in the sixth operating state, the air passage between the pilot inlet B41 and the pilot outlet B is disconnected.

[0054] Preferably, in this embodiment, the second valve stem 45 has a fifth position and a sixth position in the third valve chamber; when the second valve stem 45 is in the fifth position, the air passage between the third air inlet 432 and the third air outlet is connected; when the second valve stem 45 is in the sixth position, the air passage between the third air inlet 432 and the third air outlet is disconnected.

[0055] The direction of movement of the second valve stem 45 is defined as the third direction. In this embodiment, the third direction is also the axial direction of the second valve stem 45. In this embodiment, the first direction, the second direction, and the third direction are the same direction. However, the present invention is not limited to this, and the first direction, the second direction, and the third direction may also be different from each other. Along the third direction, the second valve stem 45 has a fifth end and a sixth end. The third valve cavity includes a fifth chamber 434 and a sixth chamber 435. A third piston 4341 is movably disposed in the fifth chamber 434. The third piston 4341 divides the fifth chamber 434 into a chamber E4342 and a chamber F4343. The fifth end is located in the chamber F4343. The first outlet port B is connected to the chamber F4343. When there is gas in the chamber F4343, it pushes the third piston 4341 to move. The third piston 4341 abuts against the third valve stem, thereby pushing the third valve stem to move to the fifth position.

[0056] More specifically, the second valve body 43 is provided with a fourth air intake passage 433. The air intake end of the fourth air intake passage 433 is connected to the third air intake port 431. The fourth air intake passage 433 includes a ninth branch 4331 and a tenth branch 4332. The air outlet end of the ninth branch 4331 is connected to the pilot air inlet B41 to provide a pilot air source for the third pilot valve 42. The air outlet end of the tenth branch 4332 is connected to the sixth chamber 435 to supply air to the sixth chamber 435. The second valve plate 4 also includes a third elastic element 451. The third elastic element 451 makes the second valve stem 45 always have a tendency to move towards the sixth position. The second valve stem 45 is subjected to air pressure and the elastic force of the third elastic element 451, which enables it to move to the sixth position more quickly and has a faster response speed.

[0057] More specifically, the cross-sectional area of ​​the third piston 4341 facing the chamber E4342 is larger than the cross-sectional area of ​​the sixth end facing the sixth chamber 435. When the third pilot valve 42 is in the fifth working state, it supplies air to the chamber E4342, and the second valve stem 45 can overcome the elastic force of the third elastic element 451 and the pressure of the sixth chamber 435 to move to the third position.

[0058] Preferably, the gas in chamber E4342 can be discharged. In one embodiment, a third exhaust passage is provided in the third pilot valve 42, which is connected to chamber E4342 and is used to discharge the gas remaining in chamber E4342. Specifically, when the third pilot valve 42 is in the fifth working state, the third exhaust passage is closed, and when the third pilot valve 42 is in the sixth working state, the third exhaust passage is opened, and the compressed air remaining in chamber E4342 is discharged into the atmosphere through the third exhaust passage.

[0059] The above description is only a preferred embodiment of the present invention. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of this patent application are included in the scope of this patent application.

Claims

1. A valve island with pilot protection function, characterized in that, include: The manifold (1) has a main intake passage (11) and a pilot intake passage (12). A pilot switch valve (2) is installed on the manifold (1) and is used to control the opening and closing of the air passage between the main air intake passage (11) and the pilot air intake passage (12); At least one first valve plate (3) is disposed on the manifold (1), and the first valve plate (3) is provided with a pilot air inlet A (31). At least one second valve plate (4) is disposed on the manifold (1), and the second valve plate (4) is provided with a pilot air inlet B (41). The pilot air inlet A (31) is connected to the pilot air inlet channel (12); The pilot air inlet B (41) is connected to the main air intake channel (11).

2. A valve island with pilot protection function according to claim 1, characterized in that: The pilot switching valve (2) includes a first pilot valve (21), a switching valve body (22), and a switching valve stem (23). The switch valve body (22) has a first valve chamber (221), a first air inlet (2241) and a first air outlet (2242). The first air inlet (2241) and the first air outlet (2242) are both connected to the first valve chamber (221). The first air inlet (2241) is connected to the main air intake channel (11), and the first air outlet (2242) is connected to the pilot air intake channel (12). The switch valve stem (23) is movably disposed within the first valve chamber (221); The first pilot valve (21) is disposed on the switch valve body (22). The first pilot valve (21) is used to drive the switch valve stem (23) to move in order to control the air passage between the first air inlet (2241) and the first air outlet (2242).

3. A valve island with pilot protection function according to claim 2, characterized in that: The switch valve stem (23) has a first position and a second position in the first valve chamber (221); When the switch valve stem (23) is in the first position, the air passage between the first air inlet (2241) and the first air outlet (2242) is connected; When the switch valve stem (23) is in the second position, the air passage between the first air inlet (2241) and the first air outlet (2242) is disconnected.

4. A valve island with pilot protection function according to claim 3, characterized in that: The direction of movement of the switch valve stem (23) is defined as the first direction. Along the first direction, the switch valve stem (23) has a first end (231) and a second end (232). The first valve chamber (221) includes a first chamber (222) and a second chamber (223). A first piston (2221) is movably disposed in the first chamber (222), the first piston (2221) divides the first chamber (222) into chamber A (2222) and chamber B (2223), the first end (231) is located in chamber B (2223), and the second end (232) is located in the second chamber (223); The pilot switching valve (2) also includes a first elastic element (233), which makes the switching valve stem (23) always have a tendency to move towards the second position.

5. A valve island with pilot protection function according to claim 4, characterized in that: The first pilot valve (21) has a pilot inlet C (211) and a pilot outlet C. The pilot inlet C (211) is connected to the main inlet channel (11), and the pilot outlet C is connected to the chamber A (2222). The first pilot valve (21) has a first working state and a second working state; When the first pilot valve (21) is in the first working state, the air passage between the pilot air inlet C (211) and the pilot air outlet C is connected; When the first pilot valve (21) is in the second working state, the air passage between the pilot air inlet C (211) and the pilot air outlet C is disconnected.

6. A valve island with pilot protection function according to claim 5, characterized in that: The switch valve body (22) is provided with a first air inlet (2243), which is connected to the main air intake channel (11). The switch valve body (22) is provided with a first air intake passage (226), and the air intake end of the first air intake passage (226) is connected to the first air inlet (2243). The first air intake passage (226) includes a first branch (2261) and a second branch (2262). The outlet of the first branch (2261) is connected to the pilot air inlet C (211), and the outlet of the second branch (2262) is connected to the second chamber (223).

7. A valve island with pilot protection function according to claim 6, characterized in that: The switching valve body (22) includes a first valve block (224) and a second valve block (225); The first air inlet (2241), the first air outlet (2242), the first valve chamber (221), the first air inlet (2243), and the first air inlet passage (226) are all located inside the first valve block (224); The second valve block (225) is provided with a second air intake passage (227), and the air intake end of the second air intake passage (227) is connected to the main air intake passage (11); The second air intake passage (227) includes a third branch (2271) and a fourth branch (2272). The outlet end of the third branch (2271) is connected to the first air intake hole (2243), and the outlet end of the fourth branch (2272) is connected to the first air intake hole (2241).

8. A valve island with pilot protection function according to claim 4, characterized in that: The second end (232) is provided with a receiving groove (2321), the first elastic member (233) is located in the receiving groove (2321), the second chamber (223) is provided with a guide member (2231) that cooperates with the first elastic member (233), the switch valve body (22) is provided with a groove portion that cooperates with the guide member (2231), one end of the guide member (2231) is located in the groove portion, and the other end of the guide member (2231) extends into the receiving groove (2321) and abuts against the first elastic member (233).

9. A valve island with pilot protection function according to claim 1, characterized in that: The first valve plate (3) includes a second pilot valve (32), a first valve body (33) and a first valve stem (34); the second pilot valve (32) is provided with the pilot air inlet A (31); the first valve stem (34) is movably disposed within the first valve body (33); The first valve body (33) is provided with a second air inlet (331) and a second air inlet (332). The pilot air inlet channel (12) is connected to the second air inlet (331), and the main air inlet channel (11) is connected to the second air inlet (332). The first valve body (33) is provided with a third air intake passage (333), which connects the second air intake hole (331) and the pilot air intake port A (31).

10. A valve island with pilot protection function according to claim 1, characterized in that: The second valve plate (4) includes a third pilot valve (42), a second valve body (43), a third valve body (44), and a second valve stem (45); the third pilot valve (42) is provided with the pilot air inlet B (41); the second valve stem (45) is movably disposed within the second valve body (43); The second valve body (43) is provided with a third air inlet (431) and a third air inlet (432). The second valve body (43) is provided with a fourth air inlet passage (433), which connects the third air inlet (431) and the pilot air inlet B (41). The third valve body (44) is provided with a fifth air intake passage (441), the air intake end of the fifth air intake passage (441) is connected to the main air intake passage (11); the fifth air intake passage (441) includes a fifth branch (4411) and a sixth branch (4412), the air outlet end of the fifth branch (4411) is connected to the third air intake hole (431), and the air outlet end of the sixth branch (4412) is connected to the third air intake port (432).

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