A fluid switch for an energy conversion device

Abstract

The present application relates to the technical field of wastewater treatment, and discloses a fluid switch for an energy conversion device, comprising: a cylinder, on which a high-pressure water inlet, a low-pressure water outlet, a first conversion port, and a second conversion port are provided; a rotating shaft, which is rotatably arranged in the cylinder; a driving member connected to the rotating shaft; the high-pressure water inlet is connected or disconnected with the second conversion port, and when the high-pressure water inlet is connected with the second conversion port, the low-pressure water outlet is connected with the first conversion port; the high-pressure water inlet is connected or disconnected with the first conversion port, and when the high-pressure water inlet is connected with the first conversion port, the low-pressure water outlet is connected with the second conversion port; and during the rotation of the rotating shaft, the water flow diameters of the high-pressure water inlet, the low-pressure water outlet, the first conversion port, and the second conversion port change. It has the effect of improving the overall stability.

Description

Technical Field

[0001] The present application relates to the technical field of wastewater treatment, and in particular to a fluid switcher for an energy conversion device. Background Art

[0002] At present, the standards and requirements for wastewater discharge are very strict, and water environment protection has been elevated to the national strategic level. As for power plants, as major water users and drainers, their water use accounts for 20% of the total industrial water use. From multiple perspectives, cascade utilization, concentration and reduction, and water conservation are of great significance for power plants to achieve zero discharge of desulfurization wastewater. At present, in the field of zero discharge treatment of desulfurization wastewater, the use of membrane method for concentration and reduction is the main process. The TDS of desulfurization wastewater is usually around 50,000 ppm. After being concentrated by multi-stage reverse osmosis membranes, the TDS of concentrated brine can reach 100,000 ppm. The concentrated brine is then sent to the crystallization evaporation and drying process to eventually form crystalline salt solids.

[0003] In the current desulfurization wastewater treatment process, the desulfurization wastewater is usually pressurized by 100% of the water volume to enter the high-pressure pump, and then enters the reverse osmosis system through the continued pressurization of the high-pressure pump. Through the concentration and separation of the reverse osmosis membrane, it is partially concentrated into high-TDS high-pressure concentrated brine. In order to overcome the osmotic pressure of the high-TDS desulfurization wastewater, the desulfurization wastewater requires a very high water inlet pressure (50bar~120bar) in the reverse osmosis membrane system. After reverse osmosis concentration, the pressure of the high-TDS concentrated brine is often reduced by 1~2bar. After that, the high-pressure concentrated brine of this part of the reverse osmosis system is usually depressurized by valve regulation or flow-limiting orifice plate, usually to within 10bar. The low-pressure concentrated brine after decompression enters the crystallization evaporation drying process. Therefore, there is a huge waste of energy in the current membrane concentration and reduction process. The research uses an energy conversion device to recycle the high-pressure concentrated water energy of the desulfurization wastewater, thereby realizing energy saving of the process system.

[0004] Among them, the work exchange type energy conversion device has become the focus of research because it only needs to go through the "pressure energy-pressure energy" one-step conversion process and has high energy conversion efficiency. The hydraulic cylinder type energy conversion device belongs to the work exchange type energy conversion device, which includes a hydraulic cylinder body and a piston in the hydraulic cylinder body. Concentrated water and raw water enter the cylinder body from both ends of the hydraulic cylinder body respectively. The high-pressure concentrated water pushes the piston to compress the raw water, and the pressure of the high-pressure concentrated water is transferred to the raw water, thereby realizing energy exchange. However, during the operation of the existing hydraulic cylinder type energy conversion device, after a large flow of high-pressure concentrated water is filled into the hydraulic cylinder, the raw water in the hydraulic cylinder is rapidly pressurized, causing the check valve at the raw water inlet end of the check valve group to quickly close, causing the valve plate and the valve body to knock instantly. The frequent instantaneous knocking greatly reduces the service life of the check valve, so it is necessary to solve the problem of water hammer when the energy conversion device closes the valve.

[0005] After the energy conversion is completed, the control valve or switch at the concentrated water end of the hydraulic cylinder body is adjusted, and the concentrated water with residual pressure is discharged from the hydraulic cylinder body. The discharged large-flow residual pressure concentrated water and the instantaneous contact with the low-pressure concentrated water will produce interface water hammer, which will cause the control valve or switch to vibrate frequently, affecting the stability of the entire energy conversion system.

[0006] In addition, in the prior art, the control valve or switch of the energy conversion device is provided with two low-pressure drain outlets connected to the low-pressure drain pipe. When the control valve or switch changes the flow direction of the fluid, the water flow in one of the low-pressure drain pipes is interrupted, thereby generating a vacuum at the interruption position. The impact of the reverse water flow causes the equipment to vibrate, thereby affecting the overall life and operating stability of the equipment. Summary of the invention

[0007] The purpose of the present application is to overcome the problem of insufficient stability in the prior art and to provide a fluid switcher for an energy conversion device, which has the function of improving the overall stability.

[0008] In order to achieve the above-mentioned object, the present application provides a fluid switcher for an energy conversion device, comprising:

[0009] The cylinder is hollow and has openings at both ends. The cylinder is provided with a high-pressure water inlet, a low-pressure water outlet, a first conversion port, and a second conversion port;

[0010] A rotating shaft, the rotating shaft is rotatably arranged in the cylinder;

[0011] A driving member connected to the rotating shaft to drive the rotating shaft to rotate;

[0012] During the rotation of the rotating shaft, the high-pressure water inlet is connected to or disconnected from the second conversion port, and when the high-pressure water inlet is connected to the second conversion port, the low-pressure water outlet is connected to the first conversion port;

[0013] During the rotation of the rotating shaft, the high-pressure water inlet is connected to or disconnected from the first conversion port, and when the high-pressure water inlet is connected to the first conversion port, the low-pressure water outlet is connected to the second conversion port;

[0014] In addition, during the rotation of the rotating shaft, the water passage diameters of the high-pressure water inlet, the low-pressure water outlet, the first conversion port and the second conversion port change.

[0015] In some embodiments, a first piston and a second piston are coaxially sleeved on the rotating shaft, and the first piston and the second piston are axially spaced apart from each other along the rotating shaft;

[0016] The rotating shaft is hollow inside to form an inner flow channel, and a first communicating hole and a second communicating hole are opened on the rotating shaft, the first communicating hole is covered by the first piston, and the second communicating hole is covered by the second piston, and the first communicating hole and the second communicating hole are both connected to the inner flow channel;

[0017] The first piston is provided with two first axial water channels, four first radial water channels and one first circulation water channel, the two first axial water channels are not connected to each other, the four first radial water channels are not connected to each other, the two first axial water channels are respectively connected to two of the first radial water channels, the first circulation water channel is connected to one of the remaining first radial water channels, the first communication hole is connected to another of the remaining first radial water channels, the first axial water channel and the first circulation water channel are not connected to each other, the opening of the first axial water channel faces away from the second piston, and the opening of the first circulation water channel faces the second piston;

[0018] The second piston is provided with two second axial water channels, four second radial water channels and one second circulation water channel, the two second axial water channels are not connected to each other, the four second radial water channels are not connected to each other, the two second axial water channels are respectively connected to two of the second radial water channels, the second circulation water channel is connected to one of the remaining second radial water channels, the second communication hole is connected to another of the remaining second radial water channels, the second axial water channel and the second circulation water channel are not connected to each other, the opening of the second axial water channel faces away from the first piston, and the opening of the second circulation water channel faces the first piston;

[0019] When the rotating shaft is in the initial state, the high-pressure water inlet is connected to the second radial water channel, the first conversion port is connected to the first radial water channel, and the second radial water channel is connected to the first radial water channel through the inner flow channel. At this time, the low-pressure water outlet is connected to the first radial water channel, the second conversion port is connected to the second radial water channel, and the first radial water channel is connected to the second radial water channel through the second circulation water channel and the first circulation water channel.

[0020] Adjust the rotation angle of the rotating shaft, when the high-pressure water inlet is connected to the second conversion port through the second axial water channel and the second radial water channel, the low-pressure water outlet is connected to the first conversion port through the first axial water channel and the first radial water channel;

[0021] Adjust the rotation angle of the rotating shaft. When the high-pressure water inlet is connected to the first conversion port through the second radial water channel, the second circulation water channel, the first circulation water channel, and the first radial water channel, the low-pressure water outlet is connected to the second conversion port through the first radial water channel, the first connecting hole, the inner flow channel, the second connecting hole, and the second radial water channel.

[0022] In some embodiments, the outer wall of the first piston and the outer wall of the second piston are both in contact with the inner wall of the cylinder.

[0023] In some embodiments, the two first axial water channels and the two second axial water channels are both symmetrically arranged about the axis of the rotation shaft.

[0024] In some embodiments, the first flow channel and the second flow channel are respectively located on two sides of the rotation axis.

[0025] In some embodiments, the four first radial water channels are evenly spaced apart along the circumference of the first piston, and the four second radial water channels are evenly spaced apart along the circumference of the second piston.

[0026] In some embodiments, a plurality of buffer grooves are provided on the first piston and the second piston, and the plurality of buffer grooves are respectively located at the openings of the first radial water channel and the second radial water channel.

[0027] In some embodiments, two buffer grooves are provided at each opening, both buffer grooves are connected to the opening, and the two buffer grooves connected to the same opening are spaced along the circumference of the first piston or the second piston and are symmetrically arranged about the opening.

[0028] In some embodiments, end covers are provided at both ends of the cylinder, bearings are provided on the end covers, and the rotating shaft is coaxially arranged with the bearings and the end covers.

[0029] In some embodiments, a coupling is provided at one end of the cylinder, the rotating shaft is coaxially and fixedly connected with the coupling, and the driving member is a rotating motor.

[0030] Through the above technical scheme, the energy conversion device provided in the embodiment of the present application is connected to other devices of the wastewater treatment system by a fluid switcher. In the initial state, the high-pressure water inlet is connected to the high-pressure concentrated brine inlet, the low-pressure water outlet is connected to the low-pressure concentrated brine outlet, the first conversion port is connected to the high-pressure hydraulic cylinder, and the second conversion port is connected to the low-pressure hydraulic cylinder. The first conversion port is connected to the high-pressure water inlet, and the second conversion port is connected to the low-pressure water outlet. The low-pressure desulfurization wastewater is filled into the low-pressure hydraulic cylinder, and the low-pressure concentrated brine in the low-pressure hydraulic cylinder is discharged from the low-pressure water outlet. The high-pressure concentrated brine enters the high-pressure hydraulic cylinder through the high-pressure water inlet. The high-pressure concentrated brine entering the high-pressure hydraulic cylinder exchanges pressure energy with the existing low-pressure water flow in the high-pressure hydraulic cylinder, so that the low-pressure water flow becomes a high-pressure water flow, and the high-pressure water flow is then discharged from the high-pressure water outlet of the high-pressure hydraulic cylinder. The rotating shaft rotates driven by the driving member, and the water opening diameters of the first conversion port and the second conversion port change. The opening of the second conversion port gradually decreases, resulting in the drainage of the low-pressure water pressure cylinder connected to the second conversion port beginning to be blocked, and the amount of low-pressure concentrated brine flowing out is reduced, so that the low-pressure water outlet flow in the low-pressure water pressure cylinder is gradually reduced. At the same time, the opening of the first conversion port is also gradually reduced, and the high-pressure concentrated brine water inlet of the high-pressure water pressure cylinder is blocked, so that the high-pressure water inlet flow in the high-pressure water pressure cylinder is gradually reduced, thereby slowing down the flow rate change speed of the water flow during operation, thereby reducing the possibility of severe vibration of the switch due to rapid changes in the water flow in a short time. At the same time, the technical solution has only one low-pressure water outlet for drainage, which solves the problem of vacuum generated at the water flow interruption position caused by the switching of two low-pressure drainage channels in the prior art, and the occurrence of equipment vibration caused by reverse water flow impact. Therefore, the technical solution improves the overall stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a schematic structural diagram of a fluid switcher for an energy conversion device in an embodiment of the present application;

[0032] Figure 2 is a cross-sectional view of a rotating shaft in an embodiment of the present application;

[0033] Figure 3 is a cross-sectional view of another fixed angle of the rotating axis in the embodiment of the present application;

[0034] Figure 4 is a cross-sectional view of an embodiment of the present application in which the rotating shaft is in an initial state;

[0035] Figure 5 is a cross-sectional view of the embodiment of the present application after the rotating shaft is rotated 90° counterclockwise;

[0036] Figure 6 is a cross-sectional view of the embodiment of the present application after the rotating shaft is rotated 180° counterclockwise;

[0037] Figure 7 is a cross-sectional view after the rotating shaft rotates 270° counterclockwise in the embodiment of the present application;

[0038] Figure 8 is a cross-sectional view after the rotating shaft rotates 360° counterclockwise in the embodiment of the present application;

[0039] Fig. 9 This is a schematic diagram of the application of a fluid switcher for an energy conversion device in an embodiment of the present application;

[0040] Description of Reference Numerals

[0041] 1. Cylinder; 11. End cover; 12. Bearing; 13. Coupling; 2. High-pressure water inlet; 3. Low-pressure water outlet; 4. First conversion port; 5. Second conversion port; 6. Rotating shaft; 61. Inner flow channel; 62. First connecting hole; 63. Second connecting hole; 7. Driving member; 8. First piston; 81. First flow channel opening; 82. First axial water channel; 83. First radial water channel; 84. First circulation water channel; 9. Second piston; 91. Second flow channel opening; 92. Second axial water channel; 93. Second radial water channel; 94. Second circulation water channel; 10. Buffer tank. DETAILED DESCRIPTION

[0042] The following is combined with Figure 1-9 The following detailed descriptions and drawings of the embodiments are used to illustrate the principles of the present application, but cannot be used to limit the scope of the present application. The present application can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but includes all technical solutions within the scope of the claims.

[0043] The present application provides these embodiments to make the present application thorough and complete, and to fully express the scope of the present application to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of the parts and steps, the composition of the materials, the numerical expressions and the numerical values ​​set forth in these embodiments should be interpreted as being merely exemplary, and not as limiting.

[0044] It should be noted that, in the description of this application, unless otherwise specified, the meaning of "multiple" is greater than or equal to two; the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicating the orientation or positional relationship, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0045] In addition, the words "first", "second" and similar words used in this application do not indicate any order, quantity or importance, but are only used to distinguish different parts. "Vertical" does not mean vertical in the strict sense, but is within the tolerance range. "Parallel" does not mean parallel in the strict sense, but is within the tolerance range. "Include" or "comprising" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements.

[0046] It should also be noted that in the description of this application, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances. When a specific device is described as being located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device.

[0047] All terms used in this application have the same meaning as those understood by those of ordinary skill in the art to which this application belongs, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries, such as general dictionaries, should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined herein.

[0048] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0049] The present application provides a fluid switch for an energy conversion device, comprising:

[0050] The cylinder 1 is hollow and has openings at both ends. The cylinder 1 is provided with a high-pressure water inlet 2, a low-pressure water outlet 3, a first conversion port 4, and a second conversion port 5;

[0051] A rotating shaft 6, the rotating shaft 6 is rotatably disposed in the cylinder 1;

[0052] A driving member 7 connected to the rotating shaft 6 to drive the rotating shaft 6 to rotate;

[0053] During the rotation of the rotating shaft 6, the high-pressure water inlet 2 is connected to or disconnected from the second conversion port 5. When the high-pressure water inlet 2 is connected to the second conversion port 5, the low-pressure water outlet 3 is connected to the first conversion port 4.

[0054] During the rotation of the rotating shaft 6, the high-pressure water inlet 2 is connected to or disconnected from the first conversion port 4. When the high-pressure water inlet 2 is connected to the first conversion port 4, the low-pressure water outlet 3 is connected to the second conversion port 5.

[0055] In addition, during the rotation of the rotating shaft 6 , the water passage diameters of the high-pressure water inlet 2 , the low-pressure water outlet 3 , the first conversion port 4 and the second conversion port 5 change.

[0056] A fluid switcher for an energy conversion device provided in the present application includes a cylinder 1, which is hollow and has openings at both ends to form a long cylindrical shape. The hollow interior of the cylinder 1 forms an inner cavity. A first conversion port 4 and a second conversion port 5 are provided at the upper portion of the cylinder 1, and a high-pressure water inlet 2 and a low-pressure water outlet 3 are provided at the lower portion of the cylinder 1. The first conversion port 4, the second conversion port 5, the high-pressure water inlet 2, and the low-pressure water outlet 3 are all connected to the inner cavity. The first conversion port 4 and the low-pressure water outlet 3 are symmetrical about the axis of the cylinder 1, and the second conversion port 5 and the high-pressure water inlet 2 are symmetrical about the axis of the cylinder 1.

[0057] A rotating shaft 6 is rotatably arranged in the cylinder 1 , and the rotating shaft 6 is coaxial with the cylinder 1 .

[0058] A driving member 7 is provided outside the cylinder 1, and the driving member 7 is connected to one end of the rotating shaft 6. Driven by the driving member 7, the rotating shaft 6 rotates in the circumferential direction. During the rotation of the rotating shaft 6, the high-pressure water inlet 2 can be connected or disconnected with the second conversion port 5. When the high-pressure water inlet 2 is connected with the second conversion port 5, the low-pressure water outlet 3 is connected with the first conversion port 4.

[0059] By adjusting the rotation angle of the rotating shaft 6 , the high-pressure water inlet 2 can be connected to or disconnected from the first conversion port 4 . When the high-pressure water inlet 2 is connected to the first conversion port 4 , the low-pressure water outlet 3 is connected to the second conversion port 5 .

[0060] During the rotation of the rotating shaft 6 , the water passage diameters of the high-pressure water inlet 2 , the low-pressure water outlet 3 , the first conversion port 4 and the second conversion port 5 change.

[0061] The energy conversion device provided in the embodiment of the present application is connected to other devices of the wastewater treatment system by a fluid switcher. In the initial state, the high-pressure water inlet 2 is connected to the high-pressure concentrated brine inlet, the low-pressure water outlet 3 is connected to the low-pressure concentrated brine outlet, the first conversion port 4 is connected to the high-pressure hydraulic cylinder, and the second conversion port 5 is connected to the low-pressure hydraulic cylinder. The first conversion port 4 is connected to the high-pressure water inlet 2, and the second conversion port 5 is connected to the low-pressure water outlet 3. Low-pressure desulfurization wastewater is filled into the low-pressure hydraulic cylinder, and the low-pressure concentrated brine in the low-pressure hydraulic cylinder is discharged from the low-pressure water outlet 3. The high-pressure concentrated brine enters the high-pressure hydraulic cylinder through the high-pressure water inlet 2. The high-pressure concentrated brine entering the high-pressure hydraulic cylinder exchanges pressure energy with the existing low-pressure water flow in the high-pressure hydraulic cylinder, so that the low-pressure water flow becomes a high-pressure water flow, and the high-pressure water flow is then discharged from the high-pressure water outlet of the high-pressure hydraulic cylinder. The rotating shaft 6 rotates driven by the driving member 7, and the water passage diameters of the first conversion port 4 and the second conversion port 5 change. The opening of the second conversion port 5 gradually decreases, resulting in the drainage of the low-pressure water pressure cylinder connected to the second conversion port 5 being blocked, and the amount of low-pressure concentrated brine flowing out is reduced, so that the low-pressure water outlet flow in the low-pressure water pressure cylinder is gradually reduced. At the same time, the opening of the first conversion port 4 is also gradually reduced, and the high-pressure concentrated brine water inlet of the high-pressure water pressure cylinder is blocked, so that the high-pressure water inlet flow in the high-pressure water pressure cylinder is gradually reduced, thereby slowing down the flow rate change speed of the water flow during operation, thereby reducing the possibility of severe vibration of the switch due to the rapid change of the water flow in a short time. At the same time, the technical solution has only one low-pressure water outlet 3 for drainage, which solves the problem of vacuum generated at the water flow interruption position caused by the switching of two low-pressure drainage channels in the prior art, and the occurrence of equipment vibration caused by the reverse water flow impact. Therefore, the technical solution improves the overall stability.

[0062] In some embodiments, a first piston 8 and a second piston 9 are coaxially sleeved on the rotating shaft 6, and the first piston 8 and the second piston 9 are axially spaced apart from each other along the rotating shaft 6;

[0063] The rotating shaft 6 is hollow inside to form an inner flow channel 61. The rotating shaft 6 is provided with a first communicating hole 62 and a second communicating hole 63. The first communicating hole 62 is covered by the first piston 8, and the second communicating hole 63 is covered by the second piston 9. Both the first communicating hole 62 and the second communicating hole 63 are in communication with the inner flow channel 61.

[0064] The first piston 8 is provided with two first axial water channels 82, four first radial water channels 83 and one first circulation water channel 84. The two first axial water channels 82 are not connected to each other, the four first radial water channels 83 are not connected to each other, the two first axial water channels 82 are respectively connected to two of the first radial water channels 83, the first circulation water channel 84 is connected to one of the remaining first radial water channels 83, the first communication hole 62 is connected to another of the remaining first radial water channels 83, the first axial water channel 82 and the first circulation water channel 84 are not connected to each other, the opening of the first axial water channel 82 faces away from the second piston 9, and the opening of the first circulation water channel 84 faces the second piston 9;

[0065] The second piston 9 is provided with two second axial water channels 92, four second radial water channels 93 and one second circulation water channel 94. The two second axial water channels 92 are not connected to each other, the four second radial water channels 93 are not connected to each other, the two second axial water channels 92 are respectively connected to two of the second radial water channels 93, the second circulation water channel 94 is connected to one of the remaining second radial water channels 93, the second communication hole 63 is connected to another of the remaining second radial water channels 93, the second axial water channel 92 and the second circulation water channel 94 are not connected to each other, the opening of the second axial water channel 92 faces away from the first piston 8, and the opening of the second circulation water channel 94 faces the first piston 8;

[0066] When the rotating shaft 6 is in the initial state, the high-pressure water inlet 2 is connected to the second radial water channel 93, the first conversion port 4 is connected to the first radial water channel 83, and the second radial water channel 93 is connected to the first radial water channel 83 through the inner flow channel 61. At this time, the low-pressure water outlet 3 is connected to the first radial water channel 83, the second conversion port 5 is connected to the second radial water channel 93, and the first radial water channel 83 is connected to the second radial water channel 93 through the second circulation water channel 94 and the first circulation water channel 84;

[0067] Adjust the rotation angle of the rotating shaft 6, when the high-pressure water inlet 2 is connected to the second conversion port 5 through the second axial water channel 92 and the second radial water channel 93, the low-pressure water outlet 3 is connected to the first conversion port 4 through the first axial water channel 82 and the first radial water channel 83;

[0068] Adjust the rotation angle of the rotating shaft 6. When the high-pressure water inlet 2 is connected to the first conversion port 4 through the second radial water channel 93, the second circulation water channel 94, the first circulation water channel 84, and the first radial water channel 83, the low-pressure water outlet 3 is connected to the second conversion port 5 through the first radial water channel 83, the first connecting hole 62, the inner flow channel 61, the second connecting hole 63, and the second radial water channel 93.

[0069] In some embodiments, the interior of the rotating shaft 6 is hollow to form an inner flow channel 61, and a first communicating hole 62 and a second communicating hole 63 are provided on the outer wall of the rotating shaft 6, and both the first communicating hole 62 and the second communicating hole 63 are communicated with the inner flow channel 61. A first piston 8 and a second piston 9 are coaxially sleeved on the outside of the rotating shaft 6, and the first piston 8 and the second piston 9 are spaced apart along the axial direction of the rotating shaft 6, and both the first piston 8 and the second piston 9 are located in the inner cavity, and a first flow channel opening 81 is provided on the first piston 8, and a second flow channel opening 91 is provided on the second piston 9.

[0070] The first piston 8 is provided with two first axial water channels 82, four first radial water channels 83 and one first circulation water channel 84. The two first axial water channels 82 are not connected to each other. The first axial water channel 82 is located on the side of the first piston 8 away from the second piston 9. The length direction of the first axial water channel 82 is consistent with the axial direction of the first piston 8. The two first axial water channels 82 are connected to two of the first radial water channels 83.

[0071] The first flow channel 81 includes four first radial water channels 83 . The four first radial water channels 83 are not connected to each other. The length direction of the first radial water channels 83 is consistent with the radial direction of the first piston 8 . One of the first radial water channels 83 is connected to the first communication hole 62 .

[0072] The length direction of the first circulation water channel 84 is consistent with the axial direction of the first piston 8 , the first circulation water channel 84 is connected to one of the first radial water channels 83 , the first circulation water channel 84 is not connected to the two first axial water channels 82 , and the first circulation water channel 84 is located on the side of the first piston 8 facing the second piston 9 .

[0073] The second piston 9 is provided with two second axial water channels 92, four second radial water channels 93 and one second circulation water channel 94. The two second axial water channels 92 are not connected to each other. The second axial water channel 92 is located on the side of the second piston 9 away from the first piston 8. The length direction of the second axial water channel 92 is consistent with the axial direction of the second piston 9. The two second axial water channels 92 are connected to two of the second radial water channels 93.

[0074] The second flow channel opening 91 includes four second radial water channels 93 . The four second radial water channels 93 are not connected to each other. The length direction of the second radial water channels 93 is consistent with the radial direction of the second piston 9 . One of the second radial water channels 93 is connected to the second communication hole 63 .

[0075] The length direction of the second circulation water channel 94 is consistent with the axial direction of the second piston 9 , the second circulation water channel 94 is connected to one of the second radial water channels 93 , the second circulation water channel 94 is not connected to the two second axial water channels 92 , and the second circulation water channel 94 is located on the side of the second piston 9 facing the first piston 8 .

[0076] When the rotating shaft 6 is in the initial state, the high-pressure water inlet 2 is connected to the first conversion port 4 through the second radial water channel 93, the second communication hole 63, the inner flow channel 61, the first communication hole 62, and the first radial water channel 83, and the low-pressure water outlet 3 is connected to the second conversion port 5 through the second radial water channel 93, the second circulation water channel 94, the first circulation water channel 84, and the first radial water channel 83. As the rotating shaft 6 rotates, the first conversion port 4 is gradually separated from the first radial water channel 83, and the second conversion port 5 is gradually separated from the second radial water channel 93.

[0077] After the rotating shaft 6 rotates 90° counterclockwise, the high-pressure water inlet 2 is connected to the second conversion port 5 through the second axial water channel 92 and the second radial water channel 93 , and the low-pressure water outlet 3 is connected to the first conversion port 4 through the first axial water channel 82 and the first radial water channel 83 .

[0078] After the rotating shaft 6 rotates 180° counterclockwise, the high-pressure water inlet 2 is connected to the first conversion port 4 through the second radial water channel 93, the second circulation water channel 94, the first circulation water channel 84, and the first radial water channel 83, and the low-pressure water outlet 3 is connected to the second conversion port 5 through the first radial water channel 83, the first connecting hole 62, the inner flow channel 61, the second connecting hole 63, and the second radial water channel 93.

[0079] After the rotating shaft 6 rotates 270° counterclockwise, the high-pressure water inlet 2 is connected to the second conversion port 5 through the second axial water channel 92 and the second radial water channel 93 , and the low-pressure water outlet 3 is connected to the first conversion port 4 through the first axial water channel 82 and the first radial water channel 83 .

[0080] After the rotating shaft 6 rotates 360° counterclockwise, the connection state returns to the initial position.

[0081] During the rotation of the rotating shaft 6, a group of first conversion ports 4 and the first radial water channel 83, and a group of second conversion ports 5 and the second radial water channel 93 are connected to each other and then separated, and then another group of first conversion ports 4 and the first radial water channel 83, and a group of second conversion ports 5 and the second radial water channel 93 are separated to be connected. This process includes the following stages:

[0082] "Low-pressure filling" means that low-pressure desulfurization wastewater is filled into the low-pressure water pressure cylinder from the low-pressure inlet check valve on the check valve side of the low-pressure water pressure cylinder, and the low-pressure concentrated brine in the low-pressure water pressure cylinder is discharged from the low-pressure water outlet 3.

[0083] "High-pressure exchange", high-pressure concentrated brine enters the high-pressure hydraulic cylinder, and the high-pressure concentrated brine enters the hydraulic cylinder from the high-pressure water inlet 2, and exchanges pressure energy with the existing low-pressure water flow in the hydraulic cylinder, so that the low-pressure water flow becomes a high-pressure water flow, and the high-pressure water flow is then discharged from the high-pressure water outlet of the high-pressure hydraulic cylinder and enters the overall treatment system.

[0084] In the "slow closing" stage, the first piston 8 and the second piston 9 rotate counterclockwise driven by the driving member 7, and the first radial water channel 83 and the second radial water channel 93 are staggered with the first conversion port 4 and the second conversion port 5. As the staggered angle increases, the opening of the second conversion port 5 gradually decreases, causing the drainage of the low-pressure water pressure cylinder connected to the second conversion port 5 to begin to be blocked, and the amount of low-pressure concentrated brine flowing out decreases, causing the low-pressure water outlet flow in the low-pressure water pressure cylinder to gradually decrease. At the same time, the opening of the first conversion port 4 also gradually decreases, and the high-pressure concentrated brine water inlet of the high-pressure water pressure cylinder is blocked, causing the high-pressure water inlet flow in the high-pressure water pressure cylinder to gradually decrease.

[0085] The rotating shaft 6 continues to rotate counterclockwise under the drive of the driving member 7. At this time, the low-pressure inlet check valve of the low-pressure hydraulic cylinder is slowly closed under the action of its own spring. At the same time, the high-pressure outlet check valve of the high-pressure hydraulic cylinder is slowly closed under the action of its own spring. This effectively avoids the water hammer problem that occurs when the high-pressure concentrated brine inlet water flow is instantly cut off, and realizes the slow closing effect of the check valve.

[0086] The "low-pressure pre-boost, high-pressure pre-pressure relief" stage is the "slow-opening stage". The rotating shaft 6 continues to rotate counterclockwise under the drive of the driving member 7, so that the first conversion port 4 and the first radial water channel 83, and the second conversion port 5 and the second radial water channel 93 are completely staggered. At the same time, as the rotating shaft 6 continues to rotate, the next group of first radial water channels 83 and second radial water channels 93 rotate toward the first conversion port 4 and the second conversion port 5, until the first conversion port 4 and the first radial water channel 83, and the second conversion port 5 and the second radial water channel 93 are completely connected. At this time, the first conversion port 4 is connected to the low-pressure water outlet 3, and the second conversion port 5 is connected to the high-pressure water inlet 2. During this process, high-pressure concentrated salt water gradually enters the low-pressure hydraulic cylinder, which is called "low-pressure pre-boosting", and it is transformed into a high-pressure cylinder. However, at this time, the high-pressure water inlet flow in the low-pressure hydraulic cylinder is small, which only realizes the increase of water pressure in the low-pressure hydraulic cylinder without a large flow of high-pressure water inflow; at the same time, the high-pressure hydraulic cylinder gradually discharges the concentrated salt water after pressure relief, which is called "high-pressure pre-pressure relief", and it is transformed into a low-pressure cylinder. However, at this time, the low-pressure drainage flow in the high-pressure hydraulic cylinder is small, which only realizes the reduction of water pressure relief in the high-pressure hydraulic cylinder without a large flow of low-pressure water outflow. This ensures the stable change of the overall flow rate and reduces the instability caused by large flow or change speed. At the same time, the drainage pipe connected to the low-pressure water outlet 3 continues to drain water, avoiding the reverse water flow impact in the low-pressure drainage pipe that is cut off when the two low-pressure drainages are switched in the previous technology, causing equipment vibration.

[0087] The above changes take 90° as a cycle. In one cycle, the rotating shaft 6 driven by the driving member 7 rotates continuously, presenting a "slow closing" stage, a "slow opening" stage, and a "low-pressure filling, high-pressure exchange" stage in sequence.

[0088] In some embodiments, the outer wall of the first piston 8 and the outer wall of the second piston 9 are both in contact with the inner wall of the cylinder 1 .

[0089] In some embodiments, the outer wall of the first piston 8 is pressed against the inner wall of the cylinder 1, so that the low-pressure water outlet 3, the first conversion port 4 and the first radial water channel 83 on the first piston 8 are more tightly connected, and the outer wall of the second piston 9 is also pressed against the inner wall of the cylinder 1, so that the high-pressure water inlet 2, the second conversion port 5 and the second radial water channel 93 on the second piston 9 are more tightly connected, thereby reducing the possibility of water leaking into the cylinder 1 during connection and improving stability.

[0090] In some embodiments, the two first axial water channels 82 and the two second axial water channels 92 are both symmetrically arranged with respect to the axis of the rotating shaft 6 .

[0091] In some embodiments, the two first axial water channels 82 and the two second axial water channels 92 are symmetrically arranged about the axis of the rotating shaft 6. The symmetrically arranged first axial water channels 82 and second axial water channels 92 ensure the stability of the flow of high-pressure concentrated brine and low-pressure concentrated brine during the rotation of the rotating shaft 6.

[0092] In some embodiments, the first flow channel 84 and the second flow channel 94 are respectively located on both sides of the rotating shaft 6 .

[0093] In some embodiments, the first circulation water channel 84 and the second circulation water channel 94 are respectively located on both sides of the rotating shaft 6. When the first circulation water channel 84 is connected to the low-pressure water outlet 3, the second circulation water channel 94 is separated from the high-pressure water inlet 2, avoiding the situation where the high-pressure water inlet 2 is directly connected to the low-pressure water outlet 3.

[0094] In some embodiments, the four first radial water channels 83 are evenly arranged along the circumference of the first piston 8, and the four second radial water channels 93 are evenly arranged along the circumference of the second piston 9. Every time the rotating shaft 6 rotates 90°, the first radial water channel 83 can be connected to the low-pressure water outlet 3 and the first conversion port 4, and the second radial water channel 93 can be connected to the high-pressure water inlet 2 and the second conversion port 5.

[0095] In some embodiments, a plurality of buffer grooves 10 are provided on the first piston 8 and the second piston 9. The buffer grooves 10 are used to alleviate the vibration caused by flow changes when the liquid flows through the first radial water channel 83 and the second radial water channel 93. The plurality of buffer grooves 10 are respectively located at the openings of the first radial water channel 83 and the second radial water channel 93.

[0096] In some embodiments, a plurality of buffer grooves 10 are provided on the outer walls of the first piston 8 and the second piston 9. The buffer grooves 10 are arc-shaped. Every two buffer grooves 10 on the first piston 8 correspond to an opening of a first radial water channel 83, and every two buffer grooves 10 on the second piston 9 correspond to an opening of a second radial water channel 93. The buffer grooves 10 are used to alleviate the vibration caused by flow changes when the liquid flows through the first radial water channel 83 and the second radial water channel 93. In the process of gradually closing the high-pressure water inlet 2 and the low-pressure water outlet 3, the water flow can continue to flow through the buffer groove 10, slowing down the change speed of the water flow rate and further improving the overall stability.

[0097] In some embodiments, two buffer grooves 10 are provided at each opening, both buffer grooves 10 are connected to the opening, and the two buffer grooves 10 connected to the same opening are spaced along the circumference of the first piston 8 or the second piston 9 and are symmetrically arranged about the opening.

[0098] In some embodiments, end covers 11 are provided at both ends of the cylinder 1 , bearings 12 are provided on the end covers 11 , and the rotating shaft 6 is coaxially arranged with the bearings 12 and the end covers 11 .

[0099] In some embodiments, both ends of the cylinder 1 are provided with end caps 11, which cover the openings at both ends of the cylinder 1 and play a role in fixing the position of the rotating shaft 6. The two ends of the rotating shaft 6 pass through the axis of the end caps 11. Bearings 12 are sleeved at both ends of the rotating shaft 6, and a boss that cooperates with the bearing 12 is provided on the rotating shaft 6. The bearing 12 abuts against the inner surface of the end cap 11, and the rotating shaft 6 is coaxially arranged with the bearing 12 and the end cap 11. The rotating shaft 6 is fixed by the bearing 12 and the end cap 11 to ensure the stability of the rotating shaft 6 during operation.

[0100] In some embodiments, a coupling 13 is provided at one end of the cylinder 1, the rotating shaft 6 is coaxially fixedly connected to the coupling 13, and the driving member 7 is a rotating motor.

[0101] In some embodiments, a coupling 13 is provided on the outer side of the end cover 11, one end of the rotating shaft 6 passes through the end cover 11 and is connected to the coupling 13, the coupling 13 can be a tire coupling 13, and the driving member 7 can be a gear reduction motor.

[0102] In an optimal embodiment of a fluid switcher for an energy conversion device disclosed in the present application, it includes a cylinder 1, which is hollow and has openings at both ends to form a long cylindrical shape. The hollow interior of the cylinder 1 forms an inner cavity. A first conversion port 4 and a second conversion port 5 are opened at the upper portion of the cylinder 1, and a high-pressure water inlet 2 and a low-pressure water outlet 3 are opened at the lower portion of the cylinder 1. The first conversion port 4, the second conversion port 5, the high-pressure water inlet 2, and the low-pressure water outlet 3 are all connected to the inner cavity. The first conversion port 4 and the low-pressure water outlet 3 are symmetrical about the axis of the cylinder 1, and the second conversion port 5 and the high-pressure water inlet 2 are symmetrical about the axis of the cylinder 1.

[0103] A rotating shaft 6 is rotatably disposed in the cylinder 1 , and the interior of the rotating shaft 6 is hollow to form an inner flow channel 61 .

[0104] A driving member 7 is disposed outside the cylinder 1 , and the driving member 7 is connected to one end of the rotating shaft 6 . Driven by the driving member 7 , the rotating shaft 6 rotates in the circumferential direction.

[0105] The outer coaxial sleeve of the rotating shaft 6 is provided with a first piston 8 and a second piston 9, which are spaced apart along the axial direction of the rotating shaft 6. The first piston 8 and the second piston 9 are both located in the inner cavity, and the outer wall of the first piston 8 is pressed against the inner wall of the cylinder 1, so that the connection between the low-pressure water outlet 3, the first conversion port 4 and the first radial water channel 83 on the first piston 8 is tighter, and the outer wall of the second piston 9 is also pressed against the inner wall of the cylinder 1.

[0106] The first piston 8 is provided with a first flow channel opening 81 connected to the low-pressure water outlet 3, and the second piston 9 is provided with a second flow channel opening 91 connected to the high-pressure water inlet 2. As the rotating shaft 6 rotates, the first flow channel opening 81 is staggered with the low-pressure water outlet 3, and the second flow channel opening 91 is staggered with the high-pressure water inlet 2, so that the water flow rate of the low-pressure water outlet 3 and the high-pressure water inlet 2 gradually decreases.

[0107] A first connecting hole 62 and a second connecting hole 63 are provided on the outer wall of the rotating shaft 6. Both the first connecting hole 62 and the second connecting hole 63 are communicated with the inner flow channel 61. The first connecting hole 62 and the second connecting hole 63 are respectively located at the two ends of the rotating shaft 6 and are staggered up and down. The first connecting hole 62 is covered by the first piston 8, and the second connecting hole 63 is covered by the second piston 9.

[0108] The first piston 8 is provided with two first axial water channels 82, four first radial water channels 83 and one first circulation water channel 84. The two first axial water channels 82 are not connected to each other. The first axial water channel 82 is located on the side of the first piston 8 away from the second piston 9. The two first axial water channels 82 are symmetrically arranged about the axis of the rotating shaft 6. The length direction of the first axial water channel 82 is consistent with the axial direction of the first piston 8. The two first axial water channels 82 are connected to two of the first radial water channels 83.

[0109] The first flow channel 81 includes four first radial water channels 83 . The four first radial water channels 83 are not connected to each other. The length direction of the first radial water channels 83 is consistent with the radial direction of the first piston 8 . One of the first radial water channels 83 is connected to the first communication hole 62 .

[0110] The length direction of the first circulation water channel 84 is consistent with the axial direction of the first piston 8 , the first circulation water channel 84 is connected to one of the first radial water channels 83 , the first circulation water channel 84 is not connected to the two first axial water channels 82 , and the first circulation water channel 84 is located on the side of the first piston 8 facing the second piston 9 .

[0111] The second piston 9 is provided with two second axial water channels 92, four second radial water channels 93 and one second circulation water channel 94. The two second axial water channels 92 are not connected to each other. The second axial water channel 92 is located on the side of the second piston 9 away from the first piston 8. The two second axial water channels 92 are symmetrically arranged about the axis of the rotating shaft 6. The length direction of the second axial water channel 92 is consistent with the axial direction of the second piston 9. The two second axial water channels 92 are connected to two of the second radial water channels 93.

[0112] The second flow channel opening 91 includes four second radial water channels 93 . The four second radial water channels 93 are not connected to each other. The length direction of the second radial water channels 93 is consistent with the radial direction of the second piston 9 . One of the second radial water channels 93 is connected to the second communication hole 63 .

[0113] The length direction of the second circulation water channel 94 is consistent with the axial direction of the second piston 9. The second circulation water channel 94 is connected to one of the second radial water channels 93. The second circulation water channel 94 is not connected to the two second axial water channels 92. The second circulation water channel 94 is located on the side of the second piston 9 facing the first piston 8. The first circulation water channel 84 and the second circulation water channel 94 are respectively located on both sides of the rotating shaft 6.

[0114] The four first radial water channels 83 are evenly arranged along the circumference of the first piston 8, and the four second radial water channels 93 are evenly arranged along the circumference of the second piston 9. The number of the first radial water channels 83 and the second radial water channels 93 is set to four. Every time the rotating shaft 6 rotates 90°, the first radial water channel 83 can be connected to the low-pressure water outlet 3 and the first conversion port 4, and the second radial water channel 93 can be connected to the high-pressure water inlet 2 and the second conversion port 5.

[0115] A plurality of buffer grooves 10 are provided on the outer side walls of the first piston 8 and the second piston 9. The buffer grooves 10 are arc-shaped. Every two buffer grooves 10 on the first piston 8 correspond to an opening of the first radial water channel 83. Every two buffer grooves 10 on the second piston 9 correspond to an opening of the second radial water channel 93. Two buffer grooves 10 are provided at each opening. Both buffer grooves 10 are connected to the opening. The two buffer grooves 10 connected to the same opening are spaced circumferentially along the first piston 8 or the second piston 9 and are symmetrically arranged about the opening.

[0116] When the rotating shaft 6 is in the initial state, the high-pressure water inlet 2 is connected to the first conversion port 4 through the second radial water channel 93, the second communication hole 63, the inner flow channel 61, the first communication hole 62, and the first radial water channel 83, and the low-pressure water outlet 3 is connected to the second conversion port 5 through the second radial water channel 93, the second circulation water channel 94, the first circulation water channel 84, and the first radial water channel 83. As the rotating shaft 6 rotates, the first conversion port 4 is gradually separated from the first radial water channel 83, and the second conversion port 5 is gradually separated from the second radial water channel 93.

[0117] After the rotating shaft 6 rotates 90° counterclockwise, the high-pressure water inlet 2 is connected to the second conversion port 5 through the second axial water channel 92 and the second radial water channel 93 , and the low-pressure water outlet 3 is connected to the first conversion port 4 through the first axial water channel 82 and the first radial water channel 83 .

[0118] After the rotating shaft 6 rotates 180° counterclockwise, the high-pressure water inlet 2 is connected to the first conversion port 4 through the second radial water channel 93, the second circulation water channel 94, the first circulation water channel 84, and the first radial water channel 83, and the low-pressure water outlet 3 is connected to the second conversion port 5 through the first radial water channel 83, the first connecting hole 62, the inner flow channel 61, the second connecting hole 63, and the second radial water channel 93.

[0119] After the rotating shaft 6 rotates 270° counterclockwise, the high-pressure water inlet 2 is connected to the second conversion port 5 through the second axial water channel 92 and the second radial water channel 93 , and the low-pressure water outlet 3 is connected to the first conversion port 4 through the first axial water channel 82 and the first radial water channel 83 .

[0120] After the rotating shaft 6 rotates 360° counterclockwise, the connection state returns to the initial position.

[0121] End caps 11 are provided at both ends of the cylinder 1. The end caps 11 cover the openings at both ends of the cylinder 1 and play a role in fixing the position of the rotating shaft 6. The two ends of the rotating shaft 6 pass through the axis of the end caps 11. Bearings 12 are sleeved at both ends of the rotating shaft 6. A boss that cooperates with the bearing 12 is provided on the rotating shaft 6. The bearing 12 abuts against the inner surface of the end cap 11. The rotating shaft 6 is coaxially arranged with the bearing 12 and the end cap 11. A coupling 13 is provided on the outer surface of the end cap 11. One end of the rotating shaft 6 passes through the end cap 11 and is connected to the coupling 13. The coupling 13 can adopt a tire coupling 13, and the driving member 7 can adopt a gear reduction motor.

[0122] The energy conversion device provided in the embodiment of the present application is connected to other devices of the wastewater treatment system by a fluid switcher. In the initial state, the high-pressure water inlet 2 is connected to the high-pressure concentrated brine inlet, the low-pressure water outlet 3 is connected to the low-pressure concentrated brine outlet, the first conversion port 4 is connected to the high-pressure hydraulic cylinder, and the second conversion port 5 is connected to the low-pressure hydraulic cylinder. The first conversion port 4 is connected to the high-pressure water inlet 2, and the second conversion port 5 is connected to the low-pressure water outlet 3. Low-pressure desulfurization wastewater is filled into the low-pressure hydraulic cylinder, and the low-pressure concentrated brine in the low-pressure hydraulic cylinder is discharged from the low-pressure water outlet 3. The high-pressure concentrated brine enters the high-pressure hydraulic cylinder through the high-pressure water inlet 2. The high-pressure concentrated brine entering the high-pressure hydraulic cylinder exchanges pressure energy with the existing low-pressure water flow in the high-pressure hydraulic cylinder, so that the low-pressure water flow becomes a high-pressure water flow, and the high-pressure water flow is then discharged from the high-pressure water outlet of the high-pressure hydraulic cylinder.

[0123] The rotating shaft 6 rotates under the drive of the driving member 7, the first radial water channel 83 is staggered with the first conversion port 4 and the low-pressure water outlet 3, and the second radial water channel 93 is staggered with the second conversion port 5 and the high-pressure water inlet 2. As the staggered angle increases, the opening of the second conversion port 5 gradually decreases, resulting in the drainage of the low-pressure water pressure cylinder connected to the second conversion port 5 being blocked, and the amount of low-pressure concentrated brine flowing out is reduced, so that the low-pressure water outlet flow in the low-pressure water pressure cylinder is gradually reduced. At the same time, the opening of the first conversion port 4 is also gradually reduced, and the high-pressure concentrated brine water inlet of the high-pressure water pressure cylinder is blocked, so that the high-pressure water inlet flow in the high-pressure water pressure cylinder is gradually reduced, thereby slowing down the flow rate change speed of the water flow during operation, thereby reducing the possibility of violent vibration of the control valve switch due to the rapid change of the water flow in a short time. At the same time, the technical solution has only one low-pressure water outlet for drainage, which solves the problem of vacuum at the water flow interruption position caused by the switching of two low-pressure drainage channels in the prior art, and the occurrence of equipment vibration caused by the reverse water flow impact. Therefore, the technical solution improves the overall stability.

[0124] So far, various embodiments of the present application have been described in detail. In order to avoid obscuring the concept of the present application, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solution disclosed herein.

[0125] Although some specific embodiments of the present application have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present application. It should be understood by those skilled in the art that the above embodiments may be modified or some technical features may be replaced by equivalents without departing from the scope and spirit of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict.

Claims

1. A fluid switch for an energy conversion device, characterized in that: include: A cylinder (1), wherein the cylinder (1) is hollow and has openings at both ends, and the cylinder (1) is provided with a high-pressure water inlet (2), a low-pressure water outlet (3), a first conversion port (4), and a second conversion port (5); A rotating shaft (6), the rotating shaft (6) being rotatably disposed in the cylinder (1); A driving member (7) connected to the rotating shaft (6) to drive the rotating shaft (6) to rotate; During the rotation of the rotating shaft (6), the high-pressure water inlet (2) is connected to or disconnected from the second conversion port (5); when the high-pressure water inlet (2) is connected to the second conversion port (5), the low-pressure water outlet (3) is connected to the first conversion port (4); During the rotation of the rotating shaft (6), the high-pressure water inlet (2) is connected to or disconnected from the first conversion port (4); when the high-pressure water inlet (2) is connected to the first conversion port (4), the low-pressure water outlet (3) is connected to the second conversion port (5); Furthermore, during the rotation of the rotating shaft (6), the water passage diameters of the high-pressure water inlet (2), the low-pressure water outlet (3), the first conversion port (4) and the second conversion port (5) change.

2. The fluid switcher for an energy conversion device according to claim 1, characterized in that: A first piston (8) and a second piston (9) are coaxially sleeved on the rotating shaft (6), and the first piston (8) and the second piston (9) are spaced apart from each other along the axial direction of the rotating shaft (6); The rotating shaft (6) is hollow inside to form an inner flow channel (61), and a first communicating hole (62) and a second communicating hole (63) are opened on the rotating shaft (6), the first communicating hole (62) is covered by the first piston (8), and the second communicating hole (63) is covered by the second piston (9), and the first communicating hole (62) and the second communicating hole (63) are both in communication with the inner flow channel (61); The first piston (8) is provided with two first axial water channels (82), four first radial water channels (83) and one first circulation water channel (84); the two first axial water channels (82) are not connected to each other; the four first radial water channels (83) are not connected to each other; the two first axial water channels (82) are respectively connected to two of the first radial water channels (83); the first circulation water channel (84) is connected to one of the remaining first radial water channels (83); the first communication hole (62) is connected to another of the remaining first radial water channels (83); the first axial water channel (82) and the first circulation water channel (84) are not connected to each other; the opening of the first axial water channel (82) faces away from the second piston (9); and the opening of the first circulation water channel (84) faces the second piston (9); The second piston (9) is provided with two second axial water channels (92), four second radial water channels (93) and one second circulation water channel (94); the two second axial water channels (92) are not connected to each other; the four second radial water channels (93) are not connected to each other; the two second axial water channels (92) are respectively connected to two of the second radial water channels (93); the second circulation water channel (94) is connected to one of the remaining second radial water channels (93); the second communication hole (63) is connected to another of the remaining second radial water channels (93); the second axial water channel (92) and the second circulation water channel (94) are not connected to each other; the opening of the second axial water channel (92) faces away from the first piston (8); and the opening of the second circulation water channel (94) faces the first piston (8); When the rotating shaft (6) is in an initial state, the high-pressure water inlet (2) is in communication with the second radial water channel (93), the first conversion port (4) is in communication with the first radial water channel (83), and the second radial water channel (93) is in communication with the first radial water channel (83) through the inner flow channel (61); at this time, the low-pressure water outlet (3) is in communication with the first radial water channel (83), the second conversion port (5) is in communication with the second radial water channel (93), and the first radial water channel (83) is in communication with the second radial water channel (93) through the second circulation water channel (94) and the first circulation water channel (84); The rotation angle of the rotating shaft (6) is adjusted, so that when the high-pressure water inlet (2) is connected to the second conversion port (5) through the second axial water channel (92) and the second radial water channel (93), the low-pressure water outlet (3) is connected to the first conversion port (4) through the first axial water channel (82) and the first radial water channel (83); The rotation angle of the rotating shaft (6) is adjusted, and when the high-pressure water inlet (2) is connected to the first conversion port (4) through the second radial water channel (93), the second circulation water channel (94), the first circulation water channel (84), and the first radial water channel (83), the low-pressure water outlet (3) is connected to the second conversion port (5) through the first radial water channel (83), the first connecting hole (62), the inner flow channel (61), the second connecting hole (63), and the second radial water channel (93).

3. The fluid switcher for an energy conversion device according to claim 2, characterized in that: The outer wall of the first piston (8) and the outer wall of the second piston (9) are both in contact with the inner wall of the cylinder (1).

4. The fluid switcher for an energy conversion device according to claim 2, characterized in that: The two first axial water channels (82) and the two second axial water channels (92) are both symmetrically arranged about the axis of the rotating shaft (6).

5. The fluid switcher for an energy conversion device according to claim 2, characterized in that: The first circulation water channel (84) and the second circulation water channel (94) are respectively located on two sides of the rotating shaft (6).

6. The fluid switcher for an energy conversion device according to claim 2, characterized in that: The four first radial water channels (83) are evenly spaced and arranged along the circumference of the first piston (8), and the four second radial water channels (93) are evenly spaced and arranged along the circumference of the second piston (9).

7. The fluid switcher for an energy conversion device according to claim 2, characterized in that: A plurality of buffer grooves (10) are provided on the first piston (8) and the second piston (9), and the plurality of buffer grooves (10) are respectively located at the openings of the first radial water channel (83) and the second radial water channel (93).

8. The fluid switcher for an energy conversion device according to claim 7, characterized in that: Two buffer grooves (10) are provided at each opening, and both buffer grooves (10) are connected to the opening. The two buffer grooves (10) connected to the same opening are spaced apart along the circumference of the first piston (8) or the second piston (9), and are symmetrically arranged with respect to the opening.

9. The fluid switcher for an energy conversion device according to claim 1, characterized in that: End covers (11) are provided at both ends of the cylinder (1), bearings (12) are provided on the end covers (11), and the rotating shaft (6) is coaxially arranged with the bearings (12) and the end covers (11).

10. The fluid switcher for an energy conversion device according to claim 9, characterized in that: A coupling (13) is provided at one end of the cylinder (1), the rotating shaft (6) is coaxially fixedly connected to the coupling (13), and the driving member (7) is a rotating motor.

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