Pressure exchanger

Abstract

The utility model relates to a pressure exchanger which comprises a rotor, a sleeve piece, a first end cover and a second end cover, a containing concave part is formed on the inner end face, close to the rotor, of the first end cover and / or the second end cover, a connecting face is formed on the outer side of the containing concave part, a contact face is formed on the inner side of the containing concave part, and the connecting face is higher than the contact face. The size of the contact surface is matched with that of the end surface of the rotor; as the contact surface is lower than the connecting surface, the gap formed between the rotor and the contact surface is increased, the thickness of the lubricating layer between the rotor and the first end cover and the second end cover is increased, and the friction between the rotor and the first end cover and the second end cover is reduced, so that the rotating speed of the rotor is ensured, and the working efficiency of pressure exchange is ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of energy recovery, and specifically relates to a pressure exchanger. Background Art

[0002] In recent years, with the rapid development of energy recovery technology and the continuous improvement of its device efficiency, the water production energy consumption of reverse osmosis seawater desalination systems has been greatly reduced. The pressure exchanger, an energy recovery device, has now become one of the essential equipment in seawater or brackish water reverse osmosis desalination systems.

[0003] The pressure exchanger boosts part of the energy in the high-pressure brine discharged from the reverse osmosis module into low-pressure seawater for reverse osmosis, which can significantly reduce the system's energy consumption. It achieves continuous sequential switching of the boost and relief strokes during the pressure exchange process through the rotational motion of the multi-channel rotor. The contact surfaces between the rotor and the end cover of the existing pressure exchanger are flat and have a large contact area. After shutdown, the end face of the rotor and the end face of the end cover are attracted together due to negative pressure. During startup, due to the existence of the above problem, the rotor and the end cover cannot be separated normally, causing the rotor to stop. Summary of the Invention

[0004] The purpose of the utility model is to provide a pressure exchanger to solve the problem of mutual adhesion and adsorption between the two end faces of the rotor and the contact surfaces of the corresponding end covers during the rotation of the rotor in the pressure exchanger in the prior art.

[0005] In order to achieve the above-mentioned purpose of the utility model, the utility model adopts the following technical solutions:

[0006] The utility model proposes a pressure exchanger, which includes:

[0007] The rotor comprises a first end surface and a second end surface, wherein a conversion channel penetrating the first end surface and the second end surface is formed on the rotor;

[0008] a sleeve member having a rotating inner cavity formed therein, wherein the rotor is vertically rotatably connected to the rotating inner cavity;

[0009] a first end cover connected to the first end of the sleeve member and in contact with the first end surface of the rotor; a first inlet and a first outlet are formed on the first end cover;

[0010] a second end cover connected to the second end of the sleeve member, located below the rotor and in contact with the second end surface of the rotor, wherein a second inlet and a second outlet are formed on the second end cover;

[0011] In which, the first end cover and / or the second end cover are formed with an accommodating recess on the inner end surface close to the rotor, the outer side of the accommodating recess forms a connecting surface, and the inner side of the accommodating recess forms a contact surface, the height of the connecting surface is higher than the contact surface, and the size of the contact surface is adapted to the end surface size of the rotor.

[0012] In some embodiments of the present application, a rotation gap is formed between the rotor and the sleeve member, and the accommodating recess is aligned with the rotation gap.

[0013] In some embodiments of the present application, a penetrating liquid inlet hole is further formed on the outer wall of the sleeve member, and the liquid inlet hole is connected to a liquid inlet pipe for conveying fluid into the rotating gap between the sleeve member and the rotor.

[0014] In some embodiments of the present application, the height difference between the connecting surface and the contact surface is 0.001 mm to 0.12 mm.

[0015] In some embodiments of the present application, the distance between the bottom of the accommodating recess and the contact surface is 2 mm to 4 mm.

[0016] In some embodiments of the present application, a positioning portion is formed on at least one end surface of the sleeve member, a second positioning portion is formed on the connecting surface of the first end cover and / or the second end cover, and the second positioning portion is connected to the corresponding second positioning portion to achieve positioning of the first end cover and / or the second end cover.

[0017] In some embodiments of the present application, a penetrating connection hole is formed in the middle of the rotor, the first end cover and the second end cover respectively, a tensioning rod is arranged in the connection hole, and a limiting portion is provided on the tensioning rod, and the limiting portion is respectively located on the outer surface of the first end cover and the second end cover away from the rotor.

[0018] In some embodiments of the present application, the conversion channels are provided in multiple layers along the radial direction of the rotor, the cross-sectional dimensions of the conversion channels in the same layer are the same, and the conversion channels in the same layer are provided in a circular array along the rotation center of the rotor.

[0019] In some embodiments of the present application, two or more first inlets and two or more first outlets are formed on the first end cover; the number of second inlets and second outlets on the second end cover is equal to the number of the first inlets;

[0020] The first inlet is used to input high-pressure salt water, the first outlet is used to output low-pressure salt water after decompression, the second inlet is used to input low-pressure seawater, and the second outlet is used to input high-pressure seawater after pressurization.

[0021] In some embodiments of the present application, a first blocking area is formed between the adjacent first inlet and the first outlet, a second blocking area is formed between the adjacent second inlet and the second outlet, the two ends of the conversion channel are respectively connected to the first inlet and the second inlet, or the two ends of the conversion channel are respectively connected to the first outlet and the second outlet, or the two ends of the conversion channel are respectively blocked by the first blocking area and the second blocking area.

[0022] Compared with the prior art, the advantages and positive effects of the present invention are:

[0023] An accommodating recess is formed on the inner end surface of the first end cover and / or the second end cover of the pressure exchanger of the present application, a contact surface is formed on the inner side of the accommodating recess, and a connecting surface is formed on the outer side of the accommodating recess. The first end cover and the second end cover are directly connected and fixed to the two ends of the sleeve member through the connecting surface. Since the height of the contact surface is lower than the connecting surface, the gap formed between the rotor and the contact surface is increased, so that the rotor and the end cover are physically separated. Even if the machine is shut down, they will not attract and adhere to each other, and the thickness of the lubricating layer between the rotor and the first end cover and the second end cover is increased, and the thickness of the lubricating liquid is increased, which is conducive to maintaining hydraulic lubrication, ensuring the rotation speed of the rotor, and ensuring the working efficiency of the pressure exchange.

[0024] After reading the specific embodiments of the present invention in conjunction with the accompanying drawings, other features and advantages of the present invention will become more clear. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 This is a schematic diagram of the appearance of an embodiment of the pressure exchanger proposed by the present utility model;

[0027] Figure 2 is a schematic diagram of the first end cover structure;

[0028] Figure 3 is a schematic structural diagram of the second end cover;

[0029] Figure 4 yes Figure 1 Top view of the medium pressure exchanger;

[0030] Figure 5 yes Figure 4 AA cut view in;

[0031] Figure 6 yes Figure 5 A magnified schematic diagram of point B in FIG.

[0032] Figure 7 is a schematic cross-sectional view of the second end cover;

[0033] Figure 8 yes Figure 7 The enlarged schematic diagram of point C in FIG.

[0034] Figure 9 is a partial cutaway schematic diagram of a pressure exchanger;

[0035] Figure 10 It is the rotor structure diagram;

[0036] In the figure,

[0037] 100, sleeve member; 101, rotating inner cavity; 102, rotating gap; 110, first end; 120, second end; 130, positioning portion; 140, liquid inlet;

[0038] 200, rotor; 201, first end surface; 202, second end surface; 210, conversion channel;

[0039] 300, first end cap; 310, first inlet; 320, first outlet; 330, first blocking area; 340, upper accommodating recess; 341, upper contact surface; 342, upper connecting surface; 350, upper positioning portion;

[0040] 400, second end cover; 410, second inlet; 420, second outlet; 430, second blocking area; 440, lower accommodating recess; 441, lower contact surface; 442, lower connecting surface; 450, lower positioning portion;

[0041] 500, tensioning rod; 510, limiting portion; 520, connecting hole. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0043] In the description of this application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and 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.

[0044] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. Throughout this application, unless otherwise specified, "plurality" means two or more.

[0045] In the description of this application, it should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections, direct connections, or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0046] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0047] The following disclosure provides many different embodiments or examples for implementing different structures of the present invention. To simplify the disclosure of the present invention, the components and configurations of specific examples are described below. Of course, these are merely examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numbers and / or reference letters in different examples. Such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or configurations discussed.

[0048] In recent years, with the rapid development of energy recovery technology and the continuous improvement of its device efficiency, the water production energy consumption of reverse osmosis seawater desalination systems has been greatly reduced. The pressure exchanger, an energy recovery device, has now become one of the essential equipment in seawater or brackish water reverse osmosis desalination systems.

[0049] Reverse osmosis technology has been widely used in seawater desalination. Major constraints to large-scale desalination are energy consumption and the manufacturing technology of key energy recovery components. Energy consumption accounts for over 60% of total operating costs in desalination systems. However, the brine discharged from reverse osmosis modules still maintains a pressure of 5-6 MPa. If this energy could be used to boost the pressure of the seawater feed, system energy consumption could be significantly reduced.

[0050] The energy recovery device realizes the continuous sequential switching of the boost and decompression strokes during the pressure exchange process through the rotational movement of the multi-channel rotor 200, so the continuity of the supply and discharge of the working fluid is better.

[0051] refer to Figure 1-Figure 5 , the present application proposes a pressure exchanger, which is used to exchange pressure between high-pressure brine output from a reverse osmosis module and low-pressure seawater.

[0052] Specifically, the pressure exchanger includes a rotor 200, a sleeve member 100, a first end cover 300 and a second end cover 400. The rotor 200 is cylindrical and has a plurality of conversion channels 210 parallel to the axis of the rotor 200. A rotating inner cavity 101 is formed in the sleeve member 100, and the rotor 200 can be rotatably connected in the rotating inner cavity 101.

[0053] The upper and lower ends of the rotating inner cavity 101 are respectively covered by the first end cover 300 and the second end cover 400. The two ends of the sleeve member 100 are respectively the first end 110 and the second end 120. The first end cover 300 is connected to the first end 110 of the sleeve member 100, and the second end cover 400 is connected to the second end 120 of the sleeve member 100.

[0054] A first inlet 310 and a first outlet 320 are formed on the first end cover 300 . The first inlet 310 and the first outlet 320 can be used to communicate with the conversion channel 210 .

[0055] A second inlet 410 and a second outlet 420 are formed on the second end cover 400 . The second inlet 410 corresponds to the position of the first outlet 320 . The second inlet 410 and the first outlet 320 are communicated with both ends of the conversion channel 210 .

[0056] The second outlet 420 corresponds to the position of the first inlet 310 , and is connected to the first inlet 310 and both ends of the conversion channel 210 .

[0057] The first inlet 310 is used to input high-pressure salt water, and the second outlet 420 is used to input pressurized high-pressure seawater.

[0058] The second inlet 410 is used to input low-pressure seawater, and the first outlet 320 is used to output the reduced-pressure low-pressure salt water.

[0059] The rotor 200 may be driven by an external force, or the fluid entering the conversion channel 210 through the first inlet 310 and the second inlet 410 may drive the rotor 200 to rotate, as is known in the art.

[0060] During the rotation of the rotor 200, high-pressure salt water is input from the first inlet 310 through the first end cover 300 into the conversion channel 210, causing the pressurized high-pressure seawater to be discharged from the other end of the conversion channel 210, that is, from the first outlet 320 on the second end cover 400; and then, after a very short interval, the conversion channel 210 becomes connected to the second inlet 410 from the second end cover 400, and low-pressure seawater is input from the second inlet 410, causing the low-pressure salt water to be discharged from the first outlet 320 of the first end cover 300 at the other end of the conversion channel 210 at the same time, and this cycle repeats.

[0061] Specific reference Figure 2 、 Figure 3 A receiving recess is formed on the inner end surface of the first end cover 300 and / or the second end cover 400 close to the rotor 200. Specifically, the receiving recess is an annular groove formed on the inner end surface of the first end cover 300 and / or the second end cover 400 and extending away from the rotor 200.

[0062] The accommodating recess formed on the inner end surface of the first end cover 300 is defined as an upper accommodating recess 340 , and the accommodating recess formed on the inner surface of the second end cover 400 is defined as a lower accommodating recess 440 .

[0063] The upper accommodating recess 340 divides the inner end surface of the first end cover 300 into an upper connecting surface 342 and an upper contact surface 341 . The upper connecting surface 342 is located outside the upper accommodating recess 340 , and the upper contact surface 341 is located inside the upper accommodating recess 340 .

[0064] The lower accommodating recess 440 separates the inner end surface of the second end cover 400 into a lower connecting surface 442 and a lower contact surface 441 . The lower connecting surface 442 is located outside the lower accommodating recess 440 , and the lower contact surface 441 is located inside the lower accommodating recess 440 .

[0065] refer to Figure 6-Figure 8 A connecting surface is formed on the outer side of the accommodating recess, and a contact surface is formed on the inner side of the accommodating recess. The height of the connecting surface is higher than the contact surface, and the size of the contact surface is adapted to the end face size of the rotor 200.

[0066] Specific, combined Figure 10 For the first end cover 300 , the upper connecting surface 342 thereof is higher than the upper contact surface 341 , and a gap is formed between the first end surface 201 of the rotor 200 close to the first end cover 300 and the upper contact surface 341 .

[0067] Similarly, for the second end cover 400 , the lower connecting surface 442 thereof is higher than the lower contact surface 441 , and a gap is formed between the second end surface 202 of the rotor 200 close to the second end cover 400 and the lower contact surface 441 .

[0068] During the rotation of the rotor 200, due to the formation of a gap between it and the upper contact surface 341 and / or the lower contact surface 441, the gap becomes larger during the rotation process, so that the rotor 200 and the first end cover 300 and the second end cover 400 are physically separated. Even if the machine is stopped, they will not attract and adhere to each other, and the amount of lubricating fluid in the middle increases, which is more conducive to maintaining hydraulic lubrication, and can be easily started when starting.

[0069] refer to Figure 1 、 Figure 9 In some embodiments of the present application, a rotation gap 102 is formed between the rotor 200 and the sleeve member 100 , and the accommodating recess is aligned with the rotation gap 102 .

[0070] A penetrating liquid inlet hole 140 is further formed on the outer wall of the sleeve member 100 . The liquid inlet hole 140 is externally connected to a liquid inlet pipe for conveying fluid into the rotating gap 102 between the sleeve member 100 and the rotor 200 .

[0071] The liquid inlet pipe is used to transport high-pressure brine. Part of the high-pressure brine is input into the rotating gap 102 through the liquid inlet pipe from the liquid inlet hole 140, forming a water film between the rotor 200 and the inner wall of the sleeve member 100, which plays a lubricating role and further reduces friction.

[0072] The upper accommodating recess 340 and the lower accommodating recess 440 opposite to the rotating gap 102 serve as a temporary storage for the lubricant. The lubricant input from the liquid inlet hole 140 enters the rotating gap 102 and is transported up and down along the rotating gap 102. After passing through the upper accommodating recess 340 and the lower accommodating recess 440, it enters the gap between the rotor 200 and the first end cover 300 and the second end cover 400, thereby lubricating the relative movement between the rotor 200 and the first end cover 300 and the second end cover 400.

[0073] Afterwards, the high-pressure brine that acts as a lubricant is discharged from the first outlet 320 or the second outlet 420. Since the content of the high-pressure brine in this part is very small, it will not affect the result of the pressure conversion.

[0074] In some embodiments of the present application, the height dimension h1 of the connection surface from the contact surface is designed to be 0.001mm~0.12mm, that is, the height difference between the upper connection surface 342 and the upper contact surface 341, and the lower connection surface 442 and the lower contact surface 441 is in the range of 0.001mm~0.12mm.

[0075] The distance h2 between the bottom of the accommodating recess and the contact surface is designed to be 2 mm to 4 mm.

[0076] Specifically, the distance between the bottom of the upper accommodating recess 340 and the upper contact surface 341 ranges from 2 mm to 4 mm, and the distance between the bottom of the lower accommodating recess 440 and the lower contact surface 441 ranges from 2 mm to 4 mm. If the distance is too small, the anti-adhesion effect is poor; if the distance is too large, it affects the sealing between the rotor 200 and the end cover.

[0077] Reference again Figure 2 、 Figure 3 In some embodiments, the first end cover 300 is provided with a first inlet 310 and a first outlet 320 , and the second end cover 400 is correspondingly provided with a second outlet 420 and a second inlet 410 .

[0078] The first inlet 310 and the first outlet 320 are arranged at intervals of 180 degrees around the center of the first end cover 300 .

[0079] Correspondingly, the second outlet 420 and the second inlet 410 are also arranged at intervals of 180 degrees around the center of the second end cover 400 .

[0080] Then, during one rotation of the rotor 200 , one high-pressure salt water pressure reduction process and one low-pressure seawater pressure increase process can be completed.

[0081] Additionally, in some other embodiments, two or more first inlets 310 and two or more first outlets 320 are formed on the first end cover 300 ; the number of second inlets 410 and second outlets 420 on the second end cover 400 is equal to the number of first inlets 310 .

[0082] For example but not limited to, the first end cover 300 is provided with two first inlets 310 and two first outlets 320 , and the second end cover 400 is formed with two second inlets 410 and two second outlets 420 .

[0083] The two first inlets 310 and the two first outlets 320 are equally spaced 90 degrees around the center of the first end cover 300 , and the two second inlets 410 and the two second outlets 420 are equally spaced 90 degrees around the center of the second end cover 400 .

[0084] When the rotor 200 rotates one circle, the inlets on the first end cover 300 and the second end cover 400 of each conversion channel 210 diametrically opposite to each other input high-pressure fluid, and the corresponding outlets at the other end output low-pressure fluid.

[0085] Thus, high pressure liquid is discharged from each transfer passage 210 twice during one rotation of the rotor 200; this essentially doubles the ability of the pressure exchanger to discharge high pressure liquid during each rotation of the rotor 200, as compared to prior art devices that use one inlet on each end cap and one approximately diametrically opposed outlet on each end cap.

[0086] A first blocking area 330 is formed between the adjacent first inlet 310 and the first outlet 320, and a second blocking area 430 is formed between the adjacent second inlet 410 and the second outlet 420. The two ends of the conversion channel 210 are respectively connected to the first inlet 310 and the second inlet 410, or the two ends of the conversion channel 210 are respectively connected to the first outlet 320 and the second outlet 420, or the two ends of the conversion channel 210 are respectively blocked by the first blocking area 330 and the second blocking area 430.

[0087] The arc distance corresponding to the first blocking area 330 and the second blocking area 430 is greater than the opening size of the two ends of the conversion channel 210 , and is used to seal the two ends of the conversion channel 210 .

[0088] This ensures that the conversion channel 210 on the rotor 200 cannot be connected to the inlet and outlet on the same end cover at the same time.

[0089] The height difference between the connection surface and the contact surface cannot be too large to avoid affecting the sealing between the rotor 200 and the first end cover 300 and the second end cover 400 .

[0090] Combine Figure 9 In some embodiments of the present application, in order to ensure the stable rotation of the rotor 200, the connection between the first end cover 300, the second end cover 400 and the sleeve member 100 is stable, and the first end cover 300 and the second end cover 400 are prevented from falling outward during the rotation of the rotor 200. The first end cover 300 and the second end cover 400 are limited. A tensioning rod 500 is also provided in the present application.

[0091] A penetrating connecting hole 520 is formed in the middle of the rotor 200, the first end cover 300 and the second end cover 400 respectively. The tensioning rod 500 is arranged in the connecting hole 520. A limiting portion 510 is provided on the tensioning rod 500. The limiting portion 510 is respectively located on the outer surface of the first end cover 300 and the second end cover 400 away from the rotor 200.

[0092] The limiting portion 510 is specifically a nut structure. A threaded section is provided on the tension rod 500 . The limiting portion 510 is threadedly connected to the threaded section of the tension rod 500 to limit the first end cover 300 and the second end cover 400 .

[0093] During installation, first put the first end cover 300, the rotor 200 and the second end cover 400 on the tensioning rod 500, then put the limiting part 510 from the outside of the first end cover 300 and the second end cover 400 respectively, and fix them on the threaded segment by threaded connection. The position of the threaded segment is respectively located on the outside of the first end cover 300 and the second end cover 400, and the limiting part 510 is connected to the threaded segment at the corresponding position to limit the first end cover 300 and the second end cover 400 respectively.

[0094] In other embodiments of the present application, in order to ensure that the relative positions of the first end cover 300 and the second end cover 400 are accurately installed, positioning portions 130 are respectively provided at both ends of the sleeve member 100, and the first end cover 300 and the second end cover 400 are respectively formed with upper positioning portions 350 and lower positioning portions 450 on the inner end surfaces close to the sleeve member 100.

[0095] The positioning portion 130 is connected to the corresponding upper positioning portion 350 to realize the connection and positioning of the first end cover 300 and the sleeve member 100. The positioning portion 130 below the sleeve member 100 is correspondingly connected to the lower positioning portion 450 on the second end cover 400 to realize the positioning of the second end cover 400.

[0096] The positioning portion 130 is a plurality of positioning holes arranged at an angle, and the upper positioning portion 350 and the lower positioning portion 450 are a plurality of positioning protrusions corresponding one-to-one to the positioning holes.

[0097] The multiple positioning holes of the positioning portion 130 are specifically arranged to be arranged at non-uniform intervals along the end face of the sleeve member 100. For example, but not limited to, the number of positioning holes is three, two of the three positioning holes are respectively arranged on the diameter of the end face of the sleeve member 100, that is, arranged at 180 degrees, and the specific position of the other positioning hole is not restricted, and it is sufficient to ensure that the positioning holes of the first end cover 300 and the second end cover 400 are arranged in alignment. Then, during actual installation, the relative positions of the first end cover 300 and the second end cover 400 can be determined by the connection between the first end cover 300 and the sleeve member 100, and between the second end cover 400 and the sleeve member 100, ensuring that the first inlet 310 on the first end cover 300 and the second outlet 420 on the second end cover 400 correspond one-to-one, and the first outlet 320 corresponds one-to-one to the second inlet 410.

[0098] In the description of the above embodiments, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0099] The above is only a specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any changes or replacements that can be easily thought of by any technician familiar with this technical field within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A pressure exchanger, characterized in that: include: The rotor comprises a first end surface and a second end surface, wherein a conversion channel penetrating the first end surface and the second end surface is formed on the rotor; a sleeve member having a rotating inner cavity formed therein, wherein the rotor is vertically rotatably connected to the rotating inner cavity; a first end cover connected to the first end of the sleeve member and in contact with the first end surface of the rotor; a first inlet and a first outlet are formed on the first end cover; a second end cover connected to the second end of the sleeve member, located below the rotor and in contact with the second end surface of the rotor, wherein a second inlet and a second outlet are formed on the second end cover; In which, the first end cover and / or the second end cover are formed with an accommodating recess on the inner end surface close to the rotor, the outer side of the accommodating recess forms a connecting surface, and the inner side of the accommodating recess forms a contact surface, the height of the connecting surface is higher than the contact surface, and the size of the contact surface is adapted to the end surface size of the rotor.

2. The pressure exchanger according to claim 1, characterized in that A rotation gap is formed between the rotor and the sleeve member, and the accommodating recess is aligned with the rotation gap.

3. The pressure exchanger according to claim 1, characterized in that A penetrating liquid inlet hole is also formed on the outer wall of the sleeve member. The liquid inlet hole is connected to a liquid inlet pipe for conveying fluid into the rotating gap between the sleeve member and the rotor.

4. The pressure exchanger according to claim 1, characterized in that The height difference between the connecting surface and the contact surface is 0.001 mm to 0.12 mm.

5. The pressure exchanger according to claim 1, characterized in that The distance between the bottom of the accommodating recess and the contact surface is 2 mm to 4 mm.

6. The pressure exchanger according to claim 1, characterized in that A positioning portion is formed on at least one end surface of the sleeve member, and a second positioning portion is formed on the connecting surface of the first end cover and / or the second end cover, and the second positioning portion is connected to the corresponding second positioning portion to achieve positioning of the first end cover and / or the second end cover.

7. The pressure exchanger according to claim 1, characterized in that A penetrating connection hole is formed in the middle of the rotor, the first end cover and the second end cover respectively, a tensioning rod is arranged in the connection hole, and a limiting portion is provided on the tensioning rod, and the limiting portion is respectively located on the outer surface of the first end cover and the second end cover away from the rotor.

8. The pressure exchanger according to claim 1, characterized in that The conversion channels are arranged in multiple layers along the radial direction of the rotor. The cross-sectional dimensions of the conversion channels in the same layer are the same, and the conversion channels in the same layer are arranged in a circular array along the rotation center of the rotor.

9. The pressure exchanger according to claim 1, characterized in that Two or more first inlets and two or more first outlets are formed on the first end cover; the number of the second inlets and the second outlets on the second end cover is equal to the number of the first inlets; The first inlet is used to input high-pressure salt water, the first outlet is used to output low-pressure salt water after decompression, the second inlet is used to input low-pressure seawater, and the second outlet is used to input high-pressure seawater after pressurization.

10. The pressure exchanger according to claim 1, characterized in that A first blocking area is formed between the adjacent first inlet and first outlet, and a second blocking area is formed between the adjacent second inlet and second outlet. The two ends of the conversion channel are respectively connected to the first inlet and the second inlet, or the two ends of the conversion channel are respectively connected to the first outlet and the second outlet, or the two ends of the conversion channel are respectively blocked by the first blocking area and the second blocking area.

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