A self-balancing reversing control valve and a reversing device

Abstract

The present invention provides a self-balancing reversing control valve and a reversing device, belonging to the field of tools for controlling the flow direction of sand washing fluid in oilfield production, and mainly solving the technical problems of cumbersome operation of the existing valve group and easy pressure buildup of the equipment. The self-balancing reversing control valve includes a valve body, an outlet and an inlet are provided on the valve body, a reversing device and a balancing device are arranged inside the valve body. By changing the position of the reversing device inside the valve body, the outlet communicating with the inlet on the valve body can be changed; by changing the position of the balancing device, the position of the reversing device can be changed, and the reversing device can be kept at a position where a certain outlet communicates with the inlet; an operating part capable of driving the balancing device to change its position is also provided on the valve body. The self-balancing reversing control valve of the present invention can achieve the effect of controlling the flow direction of the sand washing fluid only by changing the position of the operating part once, eliminating the problem of pressure buildup of the equipment caused by uncoordinated operating actions.

Description

Technical Field

[0001] The present invention relates to a tool for controlling the flow direction of sand washing fluid in the sand washing process of oilfield production, and particularly relates to a self-balancing reversing control valve and a reversing device. Background Art

[0002] In the continuous sand washing process of oil well workover operations in oilfields, the currently commonly used tool for controlling the flow direction of sand washing fluid on the ground is a valve group composed of more than three valves and pipe manifolds. When controlling the flow direction of sand washing fluid, it is necessary to synchronously open and close more than two of these valves to complete the action of controlling the flow direction of sand washing fluid. If the actions are not coordinated, it is easy to generate pressure buildup, and the water hose or high-pressure rubber hose may burst when the pressure buildup is severe.

[0003] Therefore, on the basis of ensuring timely and accurate commutation effects, designing a reversing device with simple operation is an important technical problem to be solved by those skilled in the art. Summary of the Invention

[0004] The purpose of the present invention is to provide a self-balancing reversing control valve to solve the technical problems of the existing valve group being cumbersome to operate and the equipment being prone to pressure buildup. In the preferred implementation scheme of the present invention, many beneficial effects can be achieved, which will be specifically described below.

[0005] The present invention provides a self-balancing reversing control valve, including a valve body. The valve body is provided with a water outlet and a water inlet, and the number of the water outlets is at least two; a reversing device and a balancing device are arranged inside the valve body. By changing the position of the reversing device inside the valve body, the water outlet communicating with the water inlet on the valve body can be changed;

[0006] By changing the position of the balancing device, the position of the reversing device can be changed, and the reversing device can be kept in a position where a certain water outlet communicates with the water inlet; an operation part capable of driving the balancing device to change its position is also arranged on the valve body.

[0007] Preferably, the valve body includes a first channel and a second channel. The reversing device is arranged in the first channel, the balancing device is arranged in the second channel, the water outlet communicates with the first channel, and both the first channel and the second channel communicate with the water inlet;

[0008] The reversing device includes a reversing rod, and a force applying part and a reversing part are arranged on the circumferential surface of the reversing rod;

[0009] The first channel sequentially includes a wide-diameter section, a sealing section, and a narrow-diameter section. The aperture of the sealing section matches the outer diameter of the reversing rod. The apertures of both the wide-diameter section and the narrow-diameter section are larger than the outer diameter of the reversing rod. Moreover, the outer diameter of the force-applying part matches the aperture of the wide-diameter section, and the outer diameter of the reversing part matches the aperture of the narrow-diameter section;

[0010] When the reversing rod is arranged in the first channel, the force-applying part is located in the wide-diameter section, the reversing part is located in the narrow-diameter section, and the sealing section cooperates with the reversing rod to prevent the liquid from flowing between the wide-diameter section and the narrow-diameter section;

[0011] The resultant force of the liquid pressure borne by the force-applying part and the liquid pressure borne by the reversing part can drive the reversing rod to move along the length direction of the first channel. The valve body is also provided with a limiting part for the reversing rod, and the reversing rod can maintain balance and stay in a fixed position under the action of the resultant force and the limiting part.

[0012] Preferably, the water outlet includes a first water outlet and a second water outlet, and the projection position of the water inlet on the valve body is between the projection positions of the two water outlets;

[0013] The water inlet and the two water outlets are all communicated with the narrow-diameter section of the first channel;

[0014] When the reversing gate is located between the water inlet and the second water outlet, the liquid entering the narrow-diameter section from the water inlet can flow out from the first water outlet;

[0015] When the reversing gate is located between the water inlet and the first water outlet, the liquid entering the narrow-diameter section from the water inlet can flow out from the second water outlet.

[0016] Preferably, the valve body is provided with a fixed reversing hole communicating the wide-diameter section with the second channel;

[0017] The balance device internally is provided with a water inlet channel and a drainage channel. The water inlet channel is communicated with the side of the second channel facing the water inlet, the drainage channel is communicated with the side of the second channel away from the water inlet, a movable reversing hole is arranged on the water inlet channel, and a pressure relief hole is arranged on the drainage channel;

[0018] When the movable reversing hole corresponds to the fixed reversing hole, the liquid can sequentially enter the wide-diameter section from the water inlet, the second channel, the water inlet channel, the movable reversing hole, and the fixed reversing hole; when the pressure relief hole corresponds to the fixed reversing hole, the liquid can sequentially enter the other side of the second channel for pressure relief from the wide-diameter section, the fixed reversing hole, the pressure relief hole, and the drainage channel.

[0019] Preferably, the moving commutation holes include a first moving commutation hole and a second moving commutation hole; the fixed commutation holes include a first fixed commutation hole and a second fixed commutation hole; the pressure relief holes include a first pressure relief hole and a second pressure relief hole; the force adding part is located between the first fixed commutation hole and the second fixed commutation hole, and divides the wide diameter section into two sections;

[0020] When changing the position of the balance device in the second channel so that the first moving commutation hole corresponds to the first fixed commutation hole and the second fixed commutation hole corresponds to the second pressure relief hole, the liquid can enter a section of the wide diameter section corresponding to the first fixed commutation hole, and the liquid in the section of the wide diameter section corresponding to the second fixed commutation hole can flow out through the second pressure relief hole for pressure relief;

[0021] When the second moving commutation hole corresponds to the second fixed commutation hole and the first fixed commutation hole corresponds to the first pressure relief hole, the liquid can enter the section of the wide diameter section corresponding to the second fixed commutation hole, and the liquid in the section of the wide diameter section corresponding to the first fixed commutation hole can flow out through the first pressure relief hole for pressure relief.

[0022] Preferably, when the liquid enters the wide diameter section from the first fixed commutation hole, the resultant force can drive the commutation rod to move and make the commutation gate plate located between the water inlet and the second water outlet;

[0023] When the liquid enters the wide diameter section from the second fixed commutation hole, the resultant force can make the commutation gate plate located between the water inlet and the first water outlet.

[0024] Preferably, a pressure relief structure is further provided in the narrow diameter section. When the liquid enters from the water inlet and flows out from the first water outlet, the liquid between the commutation gate plate and the second water outlet can flow out through the pressure relief structure for pressure relief;

[0025] When the liquid enters from the water inlet and flows out from the second water outlet, the liquid between the commutation gate plate and the first water outlet can flow out through the pressure relief structure for pressure relief.

[0026] Preferably, the pressure relief structure includes a pore structure provided on the valve body, the commutation rod, and the balance device that can communicate the valve body with the external low-pressure environment.

[0027] Preferably, the commutation rod is a commutation piston connecting rod, and the force adding part and the commutation part are respectively a force adding piston and a commutation gate plate provided on the commutation piston connecting rod;

[0028] A connecting rod seat is provided at the end of the first channel located in the narrow diameter section. The connecting rod seat can seal the end of the first channel. The commutation piston connecting rod penetrates through the connecting rod seat and can move relative to the connecting rod seat;

[0029] At the other end of the wide-diameter section on the first channel, a dust-proof cap is provided, and the dust-proof cap can seal this end of the first channel;

[0030] At the outlet end on the side far from the water inlet of the second channel, a detachable balance plug is further provided.

[0031] The present invention also provides a commutation device, which includes the self-balancing commutation control valve of the present invention, and also includes a low-pressure pipeline arranged on the valve body of the self-balancing commutation control valve, and pipeline connectors arranged on the water inlet and the water outlet.

[0032] Advantages of the present invention:

[0033] For the self-balancing commutation control valve of the present invention, only by changing the position of the operation part by one action, the effect of controlling the flow direction of the flushing fluid can be completed. It completely eliminates the phenomenon of pressure buildup caused by uncoordinated operation actions, or the bursting of the water hose or high-pressure rubber hose due to pressure buildup. The effect of efficient and safe operation is achieved. Description of the drawings

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0035] Figure 1 It is a schematic structural diagram of the commutation device when the liquid flows out from the first water hole in the embodiment;

[0036] Figure 2 It is a schematic structural diagram of the commutation device when the liquid flows out from the second water hole in the embodiment;

[0037] Figure 3 It is a schematic structural diagram of the commutation device when the commutation gate plate is located at the water inlet position in the embodiment.

[0038] In the figure: 1. Commutation piston connecting rod; 2. Connecting rod seat; 3. Balance plug; 4. Valve body; 5. Balancing device; 6. Boosting piston; 7. Commutation handle; 8. Low-pressure pipeline; 9. First water outlet; 10. Water inlet; 11. Second water outlet; 12. Dust-proof cap; 13. Pipeline joint; 14. Commutation gate plate;

[0039] 21. Fixed commutation hole; 22. Movable commutation hole; 23. Pressure relief hole; 24. Pressure relief port; 25. First channel; 26. Second channel; 27. Third channel; 28. Fourth channel. Detailed implementation manners

[0040] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope protected by the present invention.

[0041] Embodiment 1

[0042] This embodiment provides a self-balancing reversing control valve, which includes a valve body 4. The valve body 4 is provided with a water outlet and a water inlet 10. The number of water outlets is at least two, and different numbers and positions of water outlets can be selected according to actual needs to meet the requirement that the flushing fluid needs to change in different directions. Inside the valve body 4, a reversing device and a balancing device 5 are provided. The valve body 4 is provided with an operating part connected to the balancing device 5. By changing the position of the balancing device 5 through the operating part, the position of the reversing device inside the valve body 4 is further changed, so as to realize the water outlet communicating with the water inlet 10 on the valve body 4 can be changed, achieving the effect of liquid flow direction reversal.

[0043] Through the self-balancing reversing control valve of this embodiment, the staff only needs to control the operating part on the valve body 4 to complete the reversing operation. The operation is simple, effectively solving the problem of equipment pressure buildup caused by uncoordinated operation actions, effectively avoiding the occurrence of accidents such as the bursting of the water hose or high-pressure rubber hose due to pressure buildup, and achieving the effect of efficient and safe operation.

[0044] Specifically, in this embodiment, the valve body 4 includes a first channel and a second channel. The reversing device is arranged in the first channel, and the balancing device 5 is arranged in the second channel. The water outlet is communicated with the first channel, and both the first channel and the second channel are communicated with the water inlet 10.

[0045] The reversing device includes a reversing rod. A force-applying part and a reversing part are provided on the circumferential surface of the reversing rod. In this embodiment, the reversing rod is a reversing piston connecting rod 1. The force-applying part and the reversing part are respectively a force-applying piston 6 and a reversing gate 14 arranged on the reversing piston connecting rod 1. The force-applying piston 6 and the reversing gate 14 are fixedly connected to the reversing piston connecting rod 1 and move synchronously.

[0046] The first channel sequentially includes a wide-diameter section, a sealing section, and a narrow-diameter section. The aperture of the sealing section matches the outer diameter of the reversing piston connecting rod 1. The apertures of the wide-diameter section and the narrow-diameter section are both larger than the outer diameter of the reversing piston connecting rod 1. The outer diameter of the force-applying piston 6 matches the aperture of the wide-diameter section, and the outer diameter of the reversing gate 14 matches the aperture of the narrow-diameter section.

[0047] At the end of the valve body 4 located in the narrow-diameter section, there is a connecting rod seat 2. The reversing piston connecting rod 1 passes through the connecting rod seat 2 and can move relative to the connecting rod seat 2. At the other end of the valve body 4 located in the wide-diameter section, there is a dust cap 12. The connecting rod seat 2 and the dust cap 12 respectively seal both ends of the first passage. At the outlet end of the second passage far from the water inlet 10, there is also a detachable balance plug 3, and the balance plug 3 can seal one end of the second passage.

[0048] Since the radial area of the boosting piston 6 is larger than that of the self-balancing reversing control valve plate, when the liquid pressures borne by both in the first passage are the same, the liquid pressure in the axial direction borne by the boosting piston 6 is greater than that of the self-balancing reversing control valve plate. When the pressure directions of the two are different, the resultant force of the two pressures is the difference between the two pressures. When the pressure directions of the two are the same, the resultant force is the sum of the two pressures. However, the direction of the resultant force is always the direction of the force borne by the boosting piston 6. The reversing piston connecting rod 1 can move according to the direction of the resultant force until it encounters the resistance of the limiting part or the resultant force disappears, then stops moving and maintains at this force balance position. When the direction of the resultant force changes, the moving direction of the reversing piston connecting rod 1 changes and it stops at a position where it can maintain balance again. In this embodiment, the limiting part can be the connecting rod seat 2 on the left side of the first passage, or the dust cap 12 on the right side, or the convex limiting structures located on the left and right sides of the sealing section on the reversing piston connecting rod 1, as long as it can prevent the reversing piston connecting rod 1 from continuing to move to the right or left.

[0049] In this embodiment, taking the case of two water outlets as an example, they are the first water outlet 9 and the second water outlet 11 respectively. The two water outlets are located on one side of the valve body 4, and it is the side close to the first passage. The water inlet 10 is located on the opposite side of the valve body 4, that is, the side close to the second passage. The water inlet 10 communicates with both the first passage and the second passage at the same time; and the projection position of the water inlet 10 is between the positions of the two water outlets.

[0050] When the reversing piston connecting rod 1 is arranged in the first passage, the boosting piston 6 is located in the wide-diameter section, dividing the wide-diameter section into two sections. The reversing gate plate 14 is located in the narrow-diameter section and divides the narrow-diameter section into two sections. The sealing section cooperates with the reversing piston connecting rod 1. The sealing section can not only prevent the liquid from flowing between the wide-diameter section and the narrow-diameter section, but also play a role in supporting the reversing piston connecting rod 1.

[0051] The water inlet 10 and the two water outlets are both connected to the narrow-diameter section. When the reversing gate 14 is located between the water inlet 10 and the first water outlet 9, the reversing gate 14 can block the connection between the water inlet 10 and the first water outlet 9, and the liquid entering the narrow-diameter section from the water inlet 10 can flow out from the second water outlet 11. The liquid between the reversing gate 14 and the second water outlet 11 flows out through the pressure relief structure for pressure relief. When the reversing gate 14 is located between the water inlet 10 and the second water outlet 11, the reversing gate 14 can block the connection between the water inlet 10 and the second water outlet 11, and the liquid entering the narrow-diameter section from the water inlet 10 can flow out from the first water outlet 9. The liquid between the reversing gate 14 and the first water outlet 9 flows out through the pressure relief structure for pressure relief.

[0052] Specifically, the pressure relief structure in this embodiment that allows partial pressure relief in the narrow-diameter section includes: a first orifice 25 provided in the section of the first channel near the first water outlet 9 and a second orifice 26 provided in the section of the first channel near the second water outlet 11. It also includes a third orifice 27 and a fourth orifice 28 provided on the reversing piston connecting rod 1 corresponding to the first orifice 25 and the second orifice 26 respectively. The third orifice 27 and the fourth orifice 28 are both arranged along the length direction of the reversing piston connecting rod 1. Among them, the first orifice 25 is provided in the sealing section and can extend to the outside of the valve body 4. The third orifice 27 can connect the narrow-diameter section and the first orifice 25. The dust cap 12 has a receiving groove that allows the end of the reversing piston connecting rod 1 to be inserted, and the opening size of the receiving groove matches the outer diameter of the reversing piston connecting rod 1, but is smaller than the internal size of the receiving groove. The second orifice 26 is provided in the receiving groove of the dust cap 12 and can extend to the outside of the valve body 4. The fourth orifice 28 can connect the narrow-diameter section and the receiving groove.

[0053] In this embodiment, the balance device 5 is internally provided with a water inlet channel and a drainage channel. A movable reversing orifice 22 is provided on the water inlet channel, and a pressure relief orifice 23 is provided on the drainage channel. The drainage channel and the pressure relief orifice 23 are both part of the pressure relief structure of the valve body 4. A fixed reversing orifice 21 for connection is provided between the wide-diameter section of the first channel and the second channel. When the movable reversing orifice 22 corresponds to the fixed reversing orifice 21, the liquid can sequentially enter the wide-diameter section of the first channel from the water inlet 10, the second channel, the water inlet channel, the movable reversing orifice 22, and the fixed reversing orifice 21.

[0054] Specifically, the movable reversing orifice 22 includes a first movable reversing orifice and a second movable reversing orifice; the fixed reversing orifice 21 includes a first fixed reversing orifice and a second fixed reversing orifice; the pressure relief orifice 23 includes a first pressure relief orifice and a second pressure relief orifice. The displacement range of the force-applying piston 6 along the axial direction when moving with the reversing piston connecting rod 1 is always between the first fixed reversing orifice and the second fixed reversing orifice.

[0055] When the position of the balancing device 5 in the second channel is changed so that the movable reversing hole 1 corresponds to the fixed reversing hole 1, the fixed reversing hole 2 corresponds to the pressure relief hole 2, and the pressure relief hole 1 and the movable reversing hole 2 are blocked, the liquid can enter the side section of the wide diameter section (the left side of the booster piston 6 in the figure) from the fixed reversing hole 21; the combined force can drive the reversing piston connecting rod 1 to move and finally make the reversing gate plate 14 located between the water inlet 10 and the water outlet 2 11 ( Figure 1 status shown in ).

[0056] When the movable reversing hole 2 corresponds to the fixed reversing hole 2, the fixed reversing hole 1 corresponds to the pressure relief hole 1, and the pressure relief hole 2 and the movable reversing hole 1 are blocked, the liquid can enter the other side section of the wide diameter section (the right side of the booster piston 6 in the figure) from the fixed reversing hole 2; at this time, the combined force can make the reversing gate 14 located between the water inlet 10 and the second water outlet 11. The liquid flowing out of the drainage channel can flow out of the valve body 4 through the pressure relief port 24 on the second channel to release the pressure, and the pressure relief port 24 also belongs to the pressure relief structure of this embodiment. ( Figure 2 Status shown in

[0057] The self-balancing reversing control valve of this embodiment, in the continuous cycle of sand flushing, by pulling the operating part, the operating part in this embodiment is the reversing handle 7, the valve body 4 makes an axial left or right movement, so that the reversing piston connecting rod 1 and the reversing gate plate 14 and the booster piston 6 on it move left or right in the axial direction of the valve body 4, and can achieve balance under the joint action of liquid pressure and the limit part, and finally realize the flow direction reversal of the sand flushing liquid, achieving the effect of efficient and safe control.

[0058] Example 2

[0059] This embodiment provides a switching device, such as Figures 1 - 3 As shown, it includes the self-balancing reversing control valve of embodiment 1, a low-pressure pipeline 8 arranged on the self-balancing reversing control valve, and pipeline connectors arranged on the water inlet 10 and the water outlet. The low-pressure pipeline 8 is connected with the pressure relief structure such as the pressure relief port 24, the hole 1 25, and the hole 2 26 on the valve body 4. The unnecessary liquid pressure inside the valve body 4 can be released through the pressure relief structure and the low-pressure pipeline 8, so as to prevent the local pressure inside the valve body 4 from being too large and damaging the valve body 4 or related pipelines.

[0060] The pipeline connector is a pipeline joint 13, which can facilitate the rapid connection between the liquid circulation pipeline and the reversing device.

[0061] Example 3

[0062] In this embodiment, the liquid needs to flow out from the water outlet 11 ( Figure 2 state) changes to flowing out from outlet 9 ( Figure 1 State) as an example, the operation steps and the movement, balance process and principle of the internal structure of the valve body 4 are described in detail:

[0063] First, move the operation part from the position in Figure 2 to the position in Figure 1 The balancing device 5 also moves from the position in Figure 2 to the position in Figure 1 according to the position change of the operation part.

[0064] At this time, within the narrow-diameter section, the position of the reversing piston connecting rod 1 in the first channel has not changed in time and remains in the position in Figure 2 The liquid entering from the water inlet 10 still enters from the right side of the reversing gate 14 and flows out from the second outlet (the liquid flow path is the thick black solid line on the right side in Figure 2 ) The force direction of the reversing gate 14 is still to the left, and the left side of the reversing gate 14 can finally communicate with the low-pressure pipeline 8 through the first channel 25 connected to the third channel 27 (the liquid flow path is the thick black dotted line on the right side in Figure 2 ); the fourth channel 28 is far from the second channel 26 and cannot communicate with the outside of the valve body 4.

[0065] Within the wide-diameter section, the liquid enters the right side of the boosting piston 6 from the fixed reversing hole two (the liquid flow path is the thick black solid line on the left side in Figure 2 ), flows out from the fixed reversing hole one for pressure relief (the liquid flow path is the thick black dotted line on the left side in Figure 2 ), and then becomes entering the left side of the boosting piston 6 from the fixed reversing hole one (the liquid flow path is the thick black solid line on the left side in Figure 1 ), and flowing out from the fixed reversing hole two for pressure relief (the liquid flow path is the thick black dotted line on the left side in Figure 1 ); the force direction of the boosting piston 6 changes from left to right. The resultant force magnitude on the reversing piston connecting rod 1 changes from the sum of the forces on the boosting piston 6 and the reversing gate 14 to the pressure difference, and the direction changes from left to right.

[0066] Then, under the action of the above pressure difference, the reversing piston connecting rod 1 starts to move to the right. When the reversing gate 14 moves to the position of the water inlet 10 (as shown in Figure 3 ), the liquid entering the narrow-diameter section can enter both sides of the reversing gate 14. The third channel 27 is far from and not connected to the first channel 25, and the fourth channel 28 is far from and not connected to the second channel 26; at this time, the pressures of the liquid on both sides of the reversing gate 14 are balanced, and the reversing piston connecting rod 1 still moves to the right due to the pressure of the boosting piston 6.

[0067] Finally, when the reversing gate 14 moves to the position between the water inlet 10 and the second outlet 11 (as shown in Figure 1 ), the liquid entering the narrow-diameter section from the water inlet 10 can only enter the left side of the reversing gate 14 and flows out from the first outlet 9 (the liquid flow path is the thick black solid line in Figure 1The liquid is reversed by the thick black solid line on the right side in the middle), the fourth channel 28 is close to and communicates with the second channel 26, and the liquid accumulated on the right side of the reversing gate plate 14 enters the receiving groove through the fourth channel 28, and then flows out through the second channel 26 to relieve pressure (the liquid flow path is Figure 1 the thick black dashed line on the right side in the middle). At this time, the left side of the reversing gate plate 14 is stressed, and the force on the right side due to pressure relief is zero. The resultant force of the reversing piston connecting rod 1 becomes the sum of the pressures on the boosting piston 6 and the reversing gate plate 14, and the direction is from right to left. The reversing piston connecting rod 1 continues to move to the right until it encounters the limiting part. At this time, the reversing piston connecting rod 1 is balanced under the combined action of the rightward liquid pressure on the boosting piston 6 and the reversing gate plate 14 and the leftward blocking pressure exerted by the limiting part on the reversing piston connecting rod 1.

[0068] Embodiment 4

[0069] When it is necessary to change the liquid to flow out from the first water outlet 9 ( Figure 1 state) to flow out from the second water outlet 11 ( Figure 2 state), only need to move the operating part from the Figure 1 position in to the Figure 2 position in. The balance principle of the movement of the internal structure of the valve body 4 is the same as that in Embodiment 3; when the reversing device is in the Figure 2 state, the reversing piston connecting rod 1 is balanced under the combined action of the combined leftward liquid pressure on the boosting piston 6 and the reversing gate plate 14 and the rightward blocking pressure exerted by the limiting part.

[0070] The above is only the specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A self-balancing reversing control valve, characterized in that, it includes a valve body (4), an outlet and an inlet (10) are provided on the valve body (4), and the number of the outlets is at least two; a reversing device and a balancing device (5) are arranged inside the valve body (4), and by changing the position of the reversing device inside the valve body (4), the outlet on the valve body (4) communicating with the inlet (10) can be changed; by changing the position of the balancing device (5), the position of the reversing device can be changed, and the reversing device can be kept at a position where a certain outlet communicates with the inlet (10); an operating part capable of driving the balancing device (5) to change its position is also provided on the valve body (4); the valve body (4) includes a first channel and a second channel, the reversing device is arranged in the first channel, the balancing device (5) is arranged in the second channel, the outlet communicates with the first channel, and both the first channel and the second channel communicate with the inlet (10); the reversing device includes a reversing rod, and a force-applying part and a reversing part are provided on the circumferential surface of the reversing rod; the first channel sequentially includes a wide-diameter section, a sealing section and a narrow-diameter section, the aperture of the sealing section matches the outer diameter of the reversing rod, the apertures of the wide-diameter section and the narrow-diameter section are both larger than the outer diameter of the reversing rod, and the outer diameter of the force-applying part matches the aperture of the wide-diameter section, and the outer diameter of the reversing part matches the aperture of the narrow-diameter section; when the reversing rod is arranged in the first channel, the force-applying part is located in the wide-diameter section, the reversing part is located in the narrow-diameter section, and the sealing section cooperates with the reversing rod to prevent the liquid from flowing between the wide-diameter section and the narrow-diameter section; the resultant force of the liquid pressure borne by the force-applying part and the liquid pressure borne by the reversing part can drive the reversing rod to move along the length direction of the first channel, and a limiting part for the reversing rod is also provided on the valve body (4), and the reversing rod can be kept balanced and maintained at a fixed position under the action of the resultant force and the limiting part; the operating part is a reversing handle (7); the outlets include a first outlet (9) and a second outlet (11), and the projection position of the inlet (10) on the valve body (4) is between the projection positions of the two outlets; the inlet (10) and the two outlets are both communicated with the narrow-diameter section of the first channel; when the reversing part (14) is located between the inlet (10) and the second outlet (11), the liquid entering the narrow-diameter section from the inlet (10) can flow out from the first outlet (9); when the reversing part (14) is located between the inlet (10) and the first outlet (9), the liquid entering the narrow-diameter section from the inlet (10) can flow out from the second outlet (11); a fixed reversing hole (21) communicating the wide-diameter section with the second channel is provided on the valve body (4); an inlet channel is arranged inside the balancing device (5), the inlet channel communicates with the side of the second channel facing the inlet (10), and a moving reversing hole (22) is provided on the inlet channel; When the moving commutation hole (22) corresponds to the fixed commutation hole (21), liquid can sequentially enter the wide-diameter section from the water inlet (10), the second channel, the water inlet channel, the moving commutation hole (22), and the fixed commutation hole (21). The moving commutation hole (22) includes a first moving commutation hole and a second moving commutation hole; the fixed commutation hole (21) includes a first fixed commutation hole and a second fixed commutation hole; the force-applying part is located between the first fixed commutation hole and the second fixed commutation hole, and divides the wide-diameter section into two sections. When changing the position of the balance device (5) in the second channel so that the first moving commutation hole corresponds to the first fixed commutation hole, liquid can enter a section of the wide-diameter section corresponding to the first fixed commutation hole, and the liquid in the section of the wide-diameter section corresponding to the second fixed commutation hole is discharged and depressurized through the pressure relief structure. When the second moving commutation hole corresponds to the second fixed commutation hole, liquid can enter the section of the wide-diameter section corresponding to the second fixed commutation hole, and the liquid in the section of the wide-diameter section corresponding to the first fixed commutation hole is discharged and depressurized through the pressure relief structure. When liquid enters the wide-diameter section from the first fixed commutation hole, the resultant force can drive the commutation rod to move and make the commutation part (14) located between the water inlet (10) and the second water outlet (11). When liquid enters the wide-diameter section from the second fixed commutation hole, the resultant force can make the commutation part (14) located between the water inlet (10) and the first water outlet (9).

2. The self-balancing commutation control valve according to claim 1, characterized in that, When liquid enters from the water inlet (10) and flows out from the first water outlet (9), the liquid between the commutation part (14) and the second water outlet (11) can flow out and be depressurized through the pressure relief structure; When liquid enters from the water inlet (10) and flows out from the second water outlet (11), the liquid between the commutation part (14) and the first water outlet (9) can flow out and be depressurized through the pressure relief structure.

3. The self-balancing commutation control valve according to claim 2, characterized in that, A pressure relief structure is provided on the valve body (4), and the pressure relief structure includes a pore structure provided on the valve body (4), the commutation rod, and the balance device (5) that can communicate the valve body (4) with the external low-pressure environment.

4. The self-balancing commutation control valve according to claim 3, characterized in that, The commutation rod is a commutation piston connecting rod (1), and the force-applying part and the commutation part are respectively a force-applying piston (6) and a commutation gate plate provided on the commutation piston connecting rod (1); A connecting rod seat (2) is provided at the end of the first channel located in the wide-diameter section, and the connecting rod seat (2) can seal the end of the first channel. The commutation piston connecting rod (1) penetrates through the connecting rod seat (2) and can move relative to the connecting rod seat (2); A dust cap (12) is provided at the other end of the first channel located in the narrow-diameter section, and the dust cap (12) can seal the end of the first channel; A detachable balance plug (3) is further provided at the outlet end of the second channel, which is on the side away from the water inlet (10).

5. A commutation device, comprising the self-balancing commutation control valve according to any one of claims 1-4, characterized in that, it further comprises a low-pressure pipeline (8) provided on the valve body (4) of the self-balancing commutation control valve, and pipeline connectors provided on the water inlet (10) and the water outlet.

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