Low-temperature punching high-low pressure water flow switching valve

Abstract

The application discloses a low-temperature punching high-low pressure water flow switching valve, and belongs to the field of hydraulic punching equipment. The switching valve is internally divided into a high-pressure cavity and a low-pressure cavity, is equipped with a reverse stopping structure and a switching structure, is provided with a protection assembly at a high-pressure port, and is further provided with a gas port. The piston cover at the tail of the protection assembly extends into a water accumulation cavity, the water accumulation cavity is communicated with the high-pressure cavity and is provided with a reset spring, the reset spring and the high-pressure water flow act on the piston cover, the protection assembly covers the high-pressure port to play a protection role when the high-pressure port is not working, and the protection assembly is exposed to normally spray water when working. Meanwhile, the valve body shell is provided with the gas port, the gas port is internally provided with an air nozzle, a gas block and a plugging bead to form a one-way path structure, the one-way path structure cooperates with the reverse stopping structure in the high-pressure cavity, compressed air can clean the water accumulation in the switching valve along the water path, the operation is simple, the cleaning efficiency is high, and the switching valve is suitable for low-temperature and cold mine areas.

Description

Technical Field

[0001] This invention relates to the field of hydraulic punching equipment, and in particular to a high-low pressure water flow switching valve for low-temperature punching. Background Technology

[0002] Hydraulic perforation refers to the use of water jets sprayed during drilling to flush out coal and methane from protruding coal seams or induce controllable small outbursts, thereby depressurizing the coal seam, releasing methane, and eliminating the risk of mining outbursts. It involves drilling a hole into a coal seam with self-flowing capacity using a high-pressure water drill bit. After drilling, medium-to-high pressure water is used through a high-efficiency nozzle to impact the coal seam surrounding the hole, flushing out a large amount of coal and gas. Stress concentration shifts towards the perforation area, depressurizing and increasing permeability of the coal seam near the perforation, effectively improving the drainage efficiency.

[0003] The hydraulic perforation high / low pressure water flow switching valve is a device used in coal mine perforation operations. It allows for the switching of high and low pressure water flows, enabling uninterrupted operation of drilling and perforation. During drilling in the coal seam, low-pressure water spray can be used to cool the drill bit connected at the beginning. After drilling is complete, the water flow can be switched from low pressure to high pressure to perforate the coal seam. The advantage of this switching valve is that it avoids the complex process of completely removing the drill rod from the newly drilled hole, installing the perforation valve, and re-inserting it before hydraulic perforation. It also reduces the likelihood of difficulties in reinserting the drill rod due to hole collapse or other reasons, thus improving the efficiency of gas drainage operations.

[0004] However, current hydraulic perforation high / low pressure water flow switching valves still have some shortcomings in practical applications. Firstly, traditional switching valves have a relatively simple structure and function. They have an internal cavity and a switching device to switch between high and low pressure. However, during drilling operations, only the low-pressure nozzle is operational, while the high-pressure nozzle is not. During drilling, particles easily accumulate near the high-pressure nozzle, and with the friction generated during drilling, some fine particles enter the high-pressure nozzle, causing blockage and preventing the normal ejection of high-pressure water during switching operations. Secondly, after operation, water accumulates inside the switching valve. In some low-temperature, cold mining areas, this water can further accumulate. The water inside the valve is prone to freezing, affecting its use. The current method is to use an air gun to blow out some of the accumulated water. However, the compressed air blown by the air gun cannot clean along the pipeline flow direction, which means that only some surface water can be blown away. The internal interfaces, bends, and nozzles of the switching valve cannot be cleaned, and these areas greatly affect the smoothness of the water flow, determining whether the switching valve can work properly. Another method is to heat the valve before use to melt the frozen water inside. Currently, in the low-temperature and cold mining areas, all methods of cleaning the water inside the switching valve are time-consuming, labor-intensive, and inefficient. Summary of the Invention

[0005] The main objective of this invention is to provide a low-temperature perforated high-low pressure water flow switching valve, which can effectively solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] A low-temperature punched high and low pressure water flow switching valve includes a valve body shell. The head and tail of the valve body shell are respectively provided with a drill bit connector and a pipeline connector. The end of the drill bit connector is provided with a low pressure port. A pair of high pressure ports are symmetrically provided on both sides of the valve body shell. The interior of the valve body shell is through and divided into a high pressure chamber and a low pressure chamber. A check valve structure is embedded at the bottom of the high pressure chamber and the junction with the pipeline connector. A switching structure is embedded at the top of the high pressure chamber and the junction with the low pressure chamber.

[0008] The high-pressure port includes a mounting hole and a high-pressure nozzle. The mounting hole passes through the valve body shell and connects to the high-pressure chamber. The high-pressure nozzle is fixedly installed in the mounting hole by a threaded connection. A movable protective component is also assembled outside the mounting hole. The tail of the protective component extends into a water accumulation chamber opened inside the valve body shell. A return spring is provided in the high-pressure chamber and is connected to the water accumulation chamber. The high-pressure water flow and the return spring act on the tail of the protective component respectively, thereby driving the protective component to slide up and down.

[0009] An air port is provided on the valve body shell, which passes through the valve body shell and connects to the high-pressure chamber. An air nozzle is fixedly installed inside the air port to connect to the high-pressure air pipe. The air port is also provided with a venting baffle and a sealing bead to form a one-way passage structure.

[0010] Preferably, the drill bit connector has an external thread for connecting to the drill bit, and the pipeline connector has an internal thread for connecting to the water supply pipeline; the low-pressure port passes through the drill bit connector and communicates with the low-pressure chamber, and an anti-clogging plate is installed at the end of the low-pressure port through a snap ring structure.

[0011] Preferably, the anti-reverse structure is fixedly installed on the inner wall of the high-pressure chamber by interference fit. The anti-reverse structure includes a cylindrical anti-reverse housing. A rotating shaft is fixedly installed laterally inside the anti-reverse housing. A semi-circular baffle is installed on each side of the rotating shaft by an elastic hinge structure. The baffle can be rotated upward 90 degrees along the rotating shaft. A sealing strip is embedded in the outer ring of each baffle. The radius of the combination of the two is equal to the radius of the inner wall of the anti-reverse housing. A limiting strip is fixedly installed on the inner wall of the anti-reverse housing below the baffle to block the baffle.

[0012] Preferably, the switching structure is fixedly installed on the inner wall of the high-pressure chamber by interference fit. The switching structure includes a cylindrical switching housing. Inside the switching housing is a circular base plate with a diameter equal to the inner diameter of the switching housing. A leakage hole is opened at the center of the base plate. A resistance spring is fixedly installed on the top of the base plate. A sealing ball is fixedly installed on the top of the resistance spring. The diameter of the sealing ball is smaller than the inner diameter of the switching housing and larger than the diameter of the hole at the bottom of the low-pressure chamber, which can seal the low-pressure chamber. A limiting ring is also fixedly installed on the inner wall of the switching housing below the base plate to block the base plate.

[0013] Preferably, the protective assembly includes a cover plate, a connecting rod, and a piston cover located at the tail of the protective assembly. The cover plate has a circular structure with an arc surface that conforms to the shape of the valve body shell. A long strip-shaped connecting rod is fixedly connected to the top of the cover plate by screws. The other end of the connecting rod is fixedly connected to the piston cover. The piston cover has a circular block structure with a diameter equal to the inner diameter of the water accumulation chamber. The bottom surface of the piston cover also has a spherical water-gathering concave surface.

[0014] Preferably, the surface of the valve body shell has vertical grooves at the mounting holes, and the inner wall of the grooves has a vertical through groove above the mounting holes. Inside the valve body shell, a water collection cavity is formed above the mounting holes and corresponding to the through grooves. The through grooves are connected to the water collection cavities.

[0015] Preferably, the valve body shell is provided with a pair of water inlets inside the shell, the water inlets are connected to the high pressure chamber and the water accumulation chamber, the water inlets are truncated cone-shaped, and their bottom surface is located on one side of the high pressure chamber. The inner wall of the high pressure chamber is also provided with a water baffle block with a semi-circular integrated structure at the entrance of the water inlets.

[0016] Preferably, the piston cover is located in the water accumulation chamber, with its bottom water-collecting concave surface facing downwards and placed horizontally. The reset spring provided in the water accumulation chamber abuts against the top of the piston cover, and the connecting rod passes through the connecting cover plate from the through groove. The cover plate is fitted into the sliding groove.

[0017] Preferably, the air nozzle is fixedly welded inside the air inlet, and the end of the air nozzle is provided with a flared structure that can be blocked by a sealing bead. The venting block is fixedly welded to the end of the air inlet, and the venting block has ventilation holes at its center and around its perimeter. The venting block rolls between the venting block and the air nozzle.

[0018] Preferably, the head of the air inlet is also equipped with a protective plug, which is inserted into the air inlet and locks the air nozzle.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] In this invention, a groove is opened at the high-pressure port on the surface of the valve body shell, and a protective component is installed. A piston cover is set at the tail of the protective component and extends into a water accumulation chamber opened inside the valve body shell. The water accumulation chamber is connected to the high-pressure chamber through a water inlet and is equipped with a return spring. The return spring and the high-pressure water flowing into the high-pressure chamber act on the piston cover, thereby driving the protective component to slide up and down. When the high-pressure port is not working, the return spring acts on the piston cover to drive the protective component downward to cover the high-pressure port and play a protective role. When the high-pressure port is working, the high-pressure water flows synchronously on the piston cover, driving the protective component upward to protrude from the high-pressure port and allow it to spray water normally.

[0021] In this invention, by setting an air port on the valve body shell, installing an air nozzle inside the air port, and configuring a venting baffle and a sealing bead to form a one-way passage structure, plus a check valve structure installed inside the high-pressure chamber, the connected compressed air can flow along the water path through every part of the switching valve, thoroughly cleaning the accumulated water. The operation is simple, the cleaning efficiency is improved, and it is suitable for use in low-temperature and cold mining areas. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 This is a schematic diagram showing the overall structure of the present invention broken down;

[0024] Figure 3 This is a partial structural diagram of the high-pressure port of the present invention;

[0025] Figure 4 This is a disassembly diagram of the switching structure of the present invention;

[0026] Figure 5 This is a schematic diagram of the anti-reverse structure of the present invention.

[0027] Figure 6 This is a schematic diagram of the protective component structure of the present invention;

[0028] Figure 7 This is a schematic diagram of the working state of the switching valve during low-pressure water spraying of the present invention (the arrow indicates the direction of water flow).

[0029] Figure 8 This is a schematic diagram of the working state of the switching valve during high-pressure water spraying according to the present invention (the arrow indicates the direction of water flow).

[0030] Figure 9 This is a schematic diagram of the state when cleaning water from the switching valve according to the present invention (the arrow indicates the airflow direction).

[0031] In the diagram: 1. Valve body housing; 2. Drill bit connector; 3. Low-pressure port; 4. High-pressure port; 5. Air port; 6. Anti-clogging plate; 7. Pipe connector; 8. High-pressure chamber; 9. Low-pressure chamber; 10. Check valve structure; 11. Switching structure; 12. High-pressure nozzle; 13. Protective plug; 14. Mounting hole; 15. Protective component; 16. Slide groove; 17. Through groove; 18. Water accumulation chamber; 19. Return spring; 20. Inlet 21. Water hole; 22. Water baffle; 23. Air nozzle; 24. Vent baffle; 25. Sealing bead; 26. Switching housing; 27. Base plate; 28. Sealing ball; 29. ​​Resistance spring; 30. Leakage hole; 31. Limiting ring; 32. Check housing; 33. Rotating shaft; 34. Baffle; 35. Sealing strip; 36. Limiting strip; 37. Cover plate; 38. Connecting rod; 39. Piston cover; 30. Water-collecting concave surface. Detailed Implementation

[0032] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0033] like Figures 1-2 As shown, a low-temperature perforated high and low pressure water flow switching valve has a drill bit connector 2 and a pipe connector 7 at the head and tail of the valve body shell 1, respectively. The end of the drill bit connector 2 is provided with a low-pressure port 3, and a pair of high-pressure ports 4 are symmetrically provided on both sides of the valve body shell 1. The interior of the valve body shell 1 is through, divided into a high-pressure chamber 8 and a low-pressure chamber 9. The drill bit connector 2 is provided with an external thread for connection with the drill bit, and the pipe connector 7 is provided with an internal thread for connection with the water supply pipe. The low-pressure port 3 passes through the drill bit connector 2 and communicates with the low-pressure chamber 9. Furthermore, an anti-blocking plate 6 is installed at the end of the low-pressure port 3 through a snap ring structure to prevent debris from entering the valve body from the low-pressure port 3.

[0034] like Figure 2 , Figure 5 As shown, a check valve structure 10 is embedded at the junction of the bottom of the high-pressure chamber 8 and the pipe joint 7. The check valve structure 10 is fixedly installed on the inner wall of the high-pressure chamber 8 by interference fit. The check valve structure 10 includes a cylindrical check valve housing 31. A rotating shaft 32 is horizontally fixedly installed inside the check valve housing 31. A semi-circular baffle 33 is installed on both sides of the rotating shaft 32 by an elastic hinge structure. The baffle 33 can be rotated upward 90 degrees along the rotating shaft 32. A sealing strip 34 is embedded on the outer ring of the baffle 33. The radius of the combination of the two is equal to the radius of the inner wall of the check valve housing 31. A limiting strip 35 is fixedly installed on the inner wall of the check valve housing 31 below the baffle 33 to block the baffle 33.

[0035] like Figure 2 , Figure 4As shown, a switching structure 11 is embedded at the junction of the top of the high-pressure chamber 8 and the low-pressure chamber 9. The switching structure 11 is fixedly installed on the inner wall of the high-pressure chamber 8 by interference fit. The switching structure 11 includes a cylindrical switching housing 25. Inside the switching housing 25, there is a circular base plate 26. The diameter of the base plate 26 is equal to the inner diameter of the switching housing 25. A leakage hole 29 is opened at the center of the base plate 26. A resistance spring 28 is fixedly installed on the top of the base plate 26. A sealing ball 27 is fixedly installed on the top of the resistance spring 28. The diameter of the sealing ball 27 is smaller than the inner diameter of the switching housing 25 and larger than the hole diameter at the bottom of the low-pressure chamber 9, which can seal the low-pressure chamber 9. A limiting ring 30 is also fixedly installed on the inner wall of the switching housing 25 below the base plate 26 to block the base plate 26.

[0036] like Figure 2 , Figure 3 , Figure 6 As shown, the high-pressure port 4 includes a mounting hole 14 and a high-pressure nozzle 12. The mounting hole 14 passes through the valve body shell 1 and connects to the high-pressure chamber 8. The high-pressure nozzle 12 is fixedly installed in the mounting hole 14 by a threaded connection. A movable protective component 15 is also assembled on the outside of the mounting hole 14. The protective component 15 includes a cover plate 36, a connecting rod 37 and a piston cover 38. The cover plate 36 has a circular structure and its surface is an arc surface that fits the shape of the valve body shell 1. A long strip-shaped connecting rod 37 is fixedly connected to the top of the cover plate 36 by screws. The other end of the connecting rod 37 is fixedly connected to the piston cover 38. The piston cover 38 has a circular block structure and its diameter is equal to the inner diameter of the water accumulation chamber 18. A spherical water-collecting concave surface 39 is also opened on the bottom surface of the piston cover 38.

[0037] In this embodiment, vertical grooves 16 are respectively opened on the surface of the valve body shell 1 at the mounting hole 14. A vertical through groove 17 is also opened on the inner wall of the groove 16 above the mounting hole 14. A water accumulation cavity 18 is respectively opened inside the shell of the valve body shell 1 above the mounting hole 14 corresponding to the through groove 17. The through groove 17 is connected to the water accumulation cavity 18.

[0038] In this embodiment, a pair of water inlet holes 20 are also provided inside the housing of the valve body shell 1. The water inlet holes 20 are connected to the high pressure chamber 8 and the water accumulation chamber 18. The water inlet holes 20 are in the shape of a frustum, and their bottom surface is located on one side of the high pressure chamber 8. The inner wall of the high pressure chamber 8 is also provided with a water baffle block 21 with a semi-arc integrated structure at the entrance of the water inlet holes 20.

[0039] In this embodiment, the piston cover 38 is located in the water accumulation chamber 18, with the water collection concave surface 39 at its bottom facing downwards and placed horizontally. The reset spring 19 provided in the water accumulation chamber 18 abuts against the top of the piston cover 38, and the connecting rod 37 passes through the connecting cover plate 36 from the through groove 17. The cover plate 36 is attached to the sliding groove 16.

[0040] like Figure 2 , Figure 3 As shown, the air port 5 passes through the valve body shell 1 and connects to the high-pressure chamber 8. An air nozzle 22 is fixedly installed inside the air port 5 to connect to the high-pressure air pipe. The air nozzle 22 is fixedly welded inside the air port 5. The end of the air nozzle 22 is provided with a flared structure and can be blocked by the sealing bead 24. The vent block 23 is fixedly welded to the end of the air port 5. Ventilation holes are opened at the center and around the perimeter of the vent block 23. The vent block 23 rolls between the vent block 23 and the air nozzle 22. The head of the air port 5 is also equipped with a protective plug 13. The protective plug 13 is inserted into the air port 5 and locks the air nozzle 22.

[0041] In practical applications, when drilling operations are performed, such as Figure 7 As shown, at this time, only low-pressure water spray is needed to cool the drill bit connected to the head end, so the water pressure is not high. When the low-pressure water flows normally through the check valve structure 10, since the check valve shell 31 of the check valve structure 10 is embedded and its inner diameter is equal to the inner diameter of the high-pressure chamber 8, there is no obstruction at the connection. The low-pressure water flows normally from the bottom to act on a pair of baffles 33. The baffles 33 are rotated by the rotating shaft 32 and are naturally rotated 90°. The low-pressure water flows into the high-pressure chamber 8. At this time, the water flow has three paths:

[0042] The water flows into the air inlet 5 through the vent block 23, but at the same time it pushes the internal sealing bead 24 towards the air nozzle 22. Finally, the sealing bead 24 is squeezed into the flared mouth and blocks the air nozzle 22, so the low-pressure water cannot flow out of the air nozzle 22.

[0043] Secondly, the water flows into the mounting hole 14 of the high-pressure port 4. However, since a high-pressure nozzle 12 is installed inside the mounting hole 14, the low-pressure water cannot be ejected from the high-pressure nozzle 12 due to insufficient pressure after entering the high-pressure nozzle 12. Therefore, the low-pressure water cannot be ejected from the high-pressure port 4. Furthermore, the low-pressure water has low pressure, and when it flows into the water collection chamber 18 through the water inlet 20, it cannot lift the piston cover 38, and thus cannot flow into the water collection chamber 18 and out.

[0044] Thirdly, the low-pressure water flows through the switching structure 11 and acts on the base plate 26. Because the base plate 26 has a drain hole 29 in its center, and the water pressure and flow rate are low, the water flows directly out of the drain hole 29, thus failing to lift the base plate 26. Consequently, it cannot move the sealing ball 27 to block the inlet of the low-pressure chamber 9. Furthermore, the base plate 26 is made of magnetic material, which allows it to adhere to the limiting ring 30 under normal conditions. This ensures that even when the water cannot lift the base plate 26, the water path from the high-pressure chamber 8 to the switching structure 11 and then to the low-pressure chamber 9 remains unobstructed, ultimately allowing a continuous flow of low-pressure water from the low-pressure port 3. Moreover, when the water supply is stopped, except for the free-rolling sealing ball 24, the other structures remain unchanged.

[0045] When drilling is completed and punching is performed, the low-pressure water flow becomes a high-pressure water flow, such as... Figure 8 As shown, at this time, the high-pressure water flow still cannot be ejected from the air outlet 5 due to the presence of the sealing bead 24. Simultaneously, the high-pressure water flow passes through the switching structure 11. At this time, the water pressure and flow rate are high. Although some water can flow out from the leak hole 29, after breaking the balance, the high-pressure water flow still acts on the edge surface of the base plate 26, lifting it until the sealing ball 27 blocks the inlet of the low-pressure chamber 9. At this time, the high-pressure water flow can no longer flow out of the low-pressure chamber 9, but instead accumulates in the high-pressure chamber 8, and then directly acts on the high-pressure outlet 4 and the water inlet hole 20. The two act synchronously. On the one hand, the high-pressure water flow enters the water accumulation chamber 18 through the water inlet hole 20. Due to the shape of the connecting rod 37... The piston cover 38 is slightly suspended within the water collection chamber 18, with its bottom surface just above the outlet of the inlet hole 20. This allows high-pressure water to flow into the water collection chamber 18 from the inlet hole 20, directly converging on the bottom surface of the piston cover 38. Furthermore, the concave structure of the piston cover 38's bottom surface helps to balance the water flow, ensuring that the water pressure exceeds the spring force of the return spring 19, thus lifting the piston cover 38. This simultaneously causes the connecting rod 37 and the cover plate 36 to slide upwards along the through groove 17 and the sliding groove 16, exposing the mounting hole 14 and, consequently, the high-pressure nozzle 12. At the same time, the high-pressure water accumulates within the high-pressure chamber 8, and when the pressure is sufficiently high, it naturally forms a high-pressure water jet from the high-pressure nozzle 12. After the water supply is stopped, the high-pressure water flow within the high-pressure chamber 8 is exhausted. First, the sealing ball 27 resets under the rebound action of the resistance spring 28, and finally, in conjunction with the magnetic base plate 26, it is attracted to the limiting ring 30, restoring its original state. Secondly, the piston cover 38 returns to its initial bottom position under the rebound force of the return spring 19, which in turn causes the cover plate 36 to slide down and cover the high pressure port 4, forming a protective barrier.

[0046] It should be noted that when the high-pressure nozzle 12 of the high-pressure port 4 sprays water to flush the hole, the piston cover 38 is lifted by the continuous water entering the water accumulation chamber 18, and some water will also be sprayed out along the through groove 17, forming a positive pressure effect. This prevents debris from entering the water accumulation chamber 18 through the through groove 17 or getting stuck in the through groove 17, and also effectively ensures the smooth sliding of the protective component 15.

[0047] When finishing the work and closing time, such as Figure 9As shown, at this point, simply remove the protective plug 13, select high-pressure air with a pressure greater than 5MPa, insert the air pipe connector into the air nozzle 22 and turn on the air. The high-pressure air will blow away the sealing bead 24 blocking the horn opening until it is blocked by the vent block 23, and the high-pressure air will enter the high-pressure chamber 8 through the through hole on the vent block 23. At this time, the baffle 33 on the anti-reverse structure 10 has automatically reset due to its own elastic hinge structure, thus blocking the high-pressure air from leaking out from the bottom of the high-pressure chamber 8. This allows the high-pressure air to flow only to the high-pressure ports 4 on both sides and the low-pressure chamber 9 above. However, high-pressure air is not the same as high-pressure water flow; its pressure is slightly lower than the pressure of high-pressure water flow (8-15MPa), so it cannot completely lift the bottom plate 26 and seal the low-pressure chamber 9. This allows the high-pressure air to blow away and dry the water accumulated in the switching structure 11 and the low-pressure chamber 9. At the same time, the high-pressure air blows towards the mounting hole 14 and the water inlet hole 20. Under continuous action, the high-pressure air acts on the high-pressure nozzle 12, which can blow it open and dry the water inside. Similarly, when high-pressure air is blown into the water collection chamber 18, it is not necessary to completely lift the piston cover 38. It is sufficient to blow the water in the water inlet 20 and the water inside the collection chamber 18 out through the channel 17 to dry them. Finally, water may accumulate at the bottom of the high-pressure chamber 8 within the check valve 10. This can be resolved by removing the valve body housing 1 and using a screwdriver or similar tool to pry open the baffle 33, allowing the water to drain out. Furthermore, the small amount of incomplete drying inside the high-pressure chamber 8, even if it freezes, will not block important pathways and can be ignored in practical applications.

[0048] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A low-temperature perforation high and low pressure water flow switching valve, comprising a valve body shell (1), wherein the head and tail of the valve body shell (1) are respectively provided with a drill bit connector (2) and a pipeline connector (7), characterized in that: The drill bit connector (2) has a low-pressure port (3) at its end, and a pair of high-pressure ports (4) are symmetrically opened on both sides of the valve body shell (1). The interior of the valve body shell (1) is open and divided into a high-pressure chamber (8) and a low-pressure chamber (9). A check valve structure (10) is installed at the junction of the bottom of the high-pressure chamber (8) and the pipe connector (7), and a switching structure (11) is installed at the junction of the top of the high-pressure chamber (8) and the low-pressure chamber (9). The high-pressure port (4) includes a mounting hole (14) and a high-pressure nozzle (12). The mounting hole (14) passes through the valve body shell (1) and connects to the high-pressure chamber (8). The high-pressure nozzle (12) is fixedly installed in the mounting hole (14) by a threaded connection. A movable protective component (15) is also assembled on the outside of the mounting hole (14). The protective component (15) includes a cover plate (36), a connecting rod (37), and a piston cover (38) located at the tail of the protective component (15). The cover plate (36) has a circular structure and its surface is an arc surface that fits the shape of the valve body shell (1). A long strip connecting rod (37) is fixedly connected to the top of the cover plate (36) by screws. The other end of the connecting rod (37) is fixedly connected to the piston cover (38). The piston cover (38) is a circular block structure with a diameter equal to the inner diameter of the water accumulation chamber (18). The bottom surface of the piston cover (38) is also provided with a spherical water-gathering concave surface (39). The piston cover (38) at the tail of the protective component (15) extends into the water accumulation chamber (18) opened inside the valve body shell (1). The high pressure chamber (8) is provided with a reset spring (19) and is connected to the water accumulation chamber (18). The piston cover (38) is located in the water accumulation chamber (18), and the water-gathering concave surface (39) at its bottom is placed horizontally downwards. The reset spring (19) provided in the water accumulation chamber (18) is pressed against the top of the piston cover (38). The high pressure water flow and the reset spring (19) act on the piston cover (38) respectively, thereby driving the protective component (15) to slide up and down. A gas port (5) is provided on the valve body shell (1). The gas port (5) passes through the valve body shell (1) and connects to the high pressure chamber (8). A gas nozzle (22) is fixedly installed inside the gas port (5) to connect to the high pressure gas pipe. The gas port (5) is also provided with a venting block (23) and a sealing bead (24) to form a one-way passage structure.

2. The low-temperature perforated high and low pressure water flow switching valve according to claim 1, characterized in that: The drill bit connector (2) has an external thread and is connected to the drill bit. The pipeline connector (7) has an internal thread and is connected to the water supply pipeline. The low-pressure port (3) passes through the drill bit connector (2) and is connected to the low-pressure chamber (9). An anti-blocking plate (6) is installed at the end of the low-pressure port (3) through a snap ring structure.

3. The low-temperature perforated high and low pressure water flow switching valve according to claim 1, characterized in that: The anti-reverse structure (10) is fixedly installed on the inner wall of the high-pressure chamber (8) by interference fit. The anti-reverse structure (10) includes a cylindrical anti-reverse housing (31). A rotating shaft (32) is fixedly installed horizontally inside the anti-reverse housing (31). A semi-circular baffle (33) is installed on both sides of the rotating shaft (32) by an elastic hinge structure. The baffle (33) can be rotated upward 90 degrees along the rotating shaft (32). A sealing strip (34) is embedded in the outer ring of the baffle (33). The radius of the combination of the two is equal to the radius of the inner wall of the anti-reverse housing (31). A limiting strip (35) is fixedly installed on the inner wall of the anti-reverse housing (31) below the baffle (33) to block the baffle (33).

4. The low-temperature perforated high and low pressure water flow switching valve according to claim 1, characterized in that: The switching structure (11) is fixedly installed on the inner wall of the high-pressure chamber (8) by interference fit. The switching structure (11) includes a cylindrical switching housing (25). The inside of the switching housing (25) is provided with a circular base plate (26). The diameter of the base plate (26) is equal to the inner diameter of the switching housing (25). A leakage hole (29) is opened at the center of the base plate (26). A resistance spring (28) is fixedly installed on the top of the base plate (26). A sealing ball (27) is fixedly installed on the top of the resistance spring (28). The diameter of the sealing ball (27) is smaller than the inner diameter of the switching housing (25) and larger than the aperture of the bottom of the low-pressure chamber (9), which can seal the low-pressure chamber (9). A limiting ring (30) is also fixedly installed on the inner wall of the switching housing (25) below the base plate (26) to block the base plate (26).

5. A low-temperature perforated high / low pressure water flow switching valve according to claim 1, characterized in that: The surface of the valve body shell (1) has vertical grooves (16) respectively opened at the mounting holes (14). The inner wall of the grooves (16) is also provided with a vertical through groove (17) above the mounting holes (14). Inside the shell of the valve body shell (1), a water accumulation cavity (18) is opened above the mounting holes (14) corresponding to the through groove (17). The through groove (17) is connected to the water accumulation cavity (18).

6. A low-temperature perforated high / low pressure water flow switching valve according to claim 5, characterized in that: The valve body housing (1) is provided with a pair of water inlet holes (20) inside the housing. The water inlet holes (20) connect the high pressure chamber (8) and the water accumulation chamber (18). The water inlet holes (20) are truncated cone-shaped, and their bottom surface is located on one side of the high pressure chamber (8). The inner wall of the high pressure chamber (8) is provided with a water baffle block (21) with a semi-arc integrated structure at the entrance of the water inlet holes (20).

7. A low-temperature perforated high / low pressure water flow switching valve according to claim 6, characterized in that: The connecting rod (37) passes through the connecting cover plate (36) from the through groove (17), and the cover plate (36) fits into the slide groove (16).

8. A low-temperature perforated high / low pressure water flow switching valve according to claim 7, characterized in that: The air nozzle (22) is fixedly welded inside the air port (5). The air nozzle (22) has a flared structure at its end and can be blocked by a sealing bead (24). The venting block (23) is fixedly welded to the end of the air port (5). Ventilation holes are provided at the center and around the perimeter of the venting block (23). The venting block (23) rolls between the venting block (23) and the air nozzle (22).

9. A low-temperature perforated high / low pressure water flow switching valve according to claim 8, characterized in that: The head of the air inlet (5) is also equipped with a protective plug (13), which is inserted into the air inlet (5) and locks the air nozzle (22).

Images