Pressure exchanger and water treatment system

Abstract

The present invention belongs to the technical field of seawater desalination, and specifically, relates to a pressure exchanger and a water treatment system. The pressure exchanger comprises a sleeve member, a rotor and an end cover assembly. A connecting structure is formed between the first end cover and the rotor, and / or a connecting structure is formed between the second end cover and the rotor. The connecting structure is used to connect adjacent input passages and output passages on the corresponding end covers when the rotor rotates, so that the transmission of pressure in the flow channel of the rotor forms a gradient between the ports corresponding to the input channel and the output channel of the end cover assembly; during the rotation of the rotor, the liquid carried in the flow channel and the pressure energy it has will be gradually released or loaded during the rotation process, avoiding sudden pressure changes, which is conducive to eliminating cavitation caused by sudden pressure changes, increasing the time of pressure transmission, and reducing vibration and noise.

Description

Technical Field

[0001] The invention belongs to the technical field of seawater desalination, and in particular relates to a pressure exchanger and a water treatment system. 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] There are high-pressure and low-pressure liquids in the pressure exchanger at the same time. The high-pressure liquid and the low-pressure liquid are isolated by the sealing surface between the rotor and the end cover. During the rotation of the rotor in the pressure exchanger, the liquid in the flow channel of the rotor undergoes switching between high pressure and low pressure. The switching time is short, and the high and low pressure liquids will produce impact water hammer effect and cavitation.

[0004] When the high-pressure fluid carried in the flow channel of the rotor passes through the sealing surface, it is easy to generate vibration and noise due to the sudden closure of the flow channel port on the corresponding side. The continuous sealing, opening and sealing process between the rotor and the end cover will produce a continuous cavitation effect on the pressure exchanger itself, causing pits in the pressure exchanger, causing sharp abnormal noise and pipeline vibration. Long-term vibration will also generate mechanical basic stress on the pipeline connected to the pressure exchanger, causing fatigue damage and reducing the service life. Summary of the invention

[0005] The purpose of the present invention is to provide a pressure exchanger and a water treatment system to solve the problems existing in the prior art that the high-pressure fluid in the rotor of the existing pressure exchanger suddenly closes during operation, causing vibration and noise, which affects the working life of the pressure exchanger and even the water treatment system.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions:

[0007] In one aspect, the present invention provides a pressure exchanger comprising:

[0008] A sleeve member having a mounting inner cavity formed therein;

[0009] A rotor rotatably connected in the mounting inner cavity, wherein along the axis of the rotor, two ends of the rotor are respectively formed with a first plane end surface and a second plane end surface, and at least two flow passages penetrating the first plane end surface and the second plane end surface are formed on the rotor, and each of the flow passages is parallel to the axis of the rotor;

[0010] An end cover assembly, comprising a first end cover and a second end cover, wherein the first end cover and the second end cover are respectively located at two ends of the sleeve member; the first end cover is formed with a first inner end face facing the rotor and a first outer end face away from the rotor, the second end cover is formed with a second inner end face facing the rotor and a second outer end face away from the rotor, the first end cover is formed with a first input passage and a first output passage, and the second end cover is formed with a second input passage and a second output passage; when the rotor rotates, the first input passage is used to input a first high-pressure fluid, the first output passage is used to output a first low-pressure fluid after decompression, the second input passage is used to input a second low-pressure fluid, and the second output passage is used to output a second high-pressure fluid after pressurization;

[0011] Wherein, a connecting structure is formed between the first end cover and the rotor, and the connecting structure is used to connect the adjacent first input passage and the first output passage when the rotor rotates, so that the fluid pressure in the flow passage is gradually loaded or released between the first input passage and the first output passage; and / or

[0012] A connecting structure is formed between the second end cover and the rotor, and the connecting structure is used to connect the adjacent second input passage and the second output passage on the second end cover when the rotor rotates, so that the fluid pressure in the flow channel can be gradually loaded or released between the second input passage and the second output passage.

[0013] In some embodiments of the present application, the communication structure is a first communication recess formed on the first inner end surface, and along the rotation direction of the rotor, the first communication recess is formed between the first input passage and the first output passage; and / or

[0014] The communication structure is a second communication recess formed on the second inner end surface, and the second communication recess is formed between the second output passage and the second input passage along the rotation direction of the rotor.

[0015] In some embodiments of the present application, a first connecting recess is also formed between the first output passage and the first input passage on the first inner end surface along the rotation direction of the rotor; and / or

[0016] A second communication recess is also formed on the second inner end surface at least between the second input passage and the second output passage along the rotation direction of the rotor.

[0017] In some embodiments of the present application, the first connecting recess includes at least one arc groove formed between the first input passage and the first output passage, and the center of the arc groove coincides with the center of the first inner end surface; and / or

[0018] The second communicating recess includes at least one arc groove formed between the second output passage and the second input passage, and the center of the arc groove coincides with the center of the second inner end surface.

[0019] In some embodiments of the present application, along the radial direction of the first inner end surface, the first connecting recess includes a plurality of arc grooves arranged at intervals; and / or

[0020] Along the radial direction of the second inner end surface, the second communicating recess includes a plurality of arc grooves arranged at intervals.

[0021] In some embodiments of the present application, the connecting structure is arranged on the first planar end surface and / or the second planar end surface of the rotor, and the connecting structure is a third connecting recess formed between adjacent flow channels.

[0022] In some embodiments of the present application, along the radial direction of the rotor, the third connecting recess includes a plurality of arc grooves arranged at intervals.

[0023] In some embodiments of the present application, along the axis of the rotor, the depth of the arc groove is less than 0.5 mm;

[0024] Along the radial direction of the rotor, the width L of the arc groove and the width D of the flow passage satisfy: L <D / 2。

[0025] In some embodiments of the present application, a plurality of contact recesses are dispersedly disposed on the first planar end surface and / or the second planar end surface of the rotor.

[0026] In some embodiments of the present application, a plurality of contact recesses are dispersedly disposed on the outer wall of the rotor.

[0027] In another aspect, the present invention further provides a water treatment system, which includes the pressure exchanger mentioned above, and the water treatment system further includes:

[0028] Water pump parts;

[0029] A first water delivery pipeline, one end of which is connected to the water pump component and the other end is connected to the input end of the reverse osmosis membrane group. A high-pressure pump is provided on the first water delivery pipeline, and the low-pressure output end of the reverse osmosis membrane group is connected to a first drain pipe;

[0030] A circulation pipeline, one end of which is connected to the high-pressure output end of the reverse osmosis membrane group, and the other end of which is connected to the first water delivery pipeline downstream of the high-pressure pump through the pressure exchanger, and a booster pump is also provided on the circulation pipeline, and the booster pump is provided between the pressure exchanger and the first water delivery pipeline;

[0031] A second water delivery pipeline, one end of which is connected to the water pump member, and the other end of which is connected to the pressure exchanger;

[0032] The first input passage of the pressure exchanger is connected to the high-pressure output end of the reverse osmosis membrane group through a circulation pipeline, and the first output passage is connected to the second drain pipe; the second input passage is connected to the water pump through a second water delivery pipeline, and the second output passage is connected to the booster pump through a circulation pipeline;

[0033] When the rotor is stationary, the first high-pressure fluid in the circulation pipeline enters the pressure exchanger from the first input passage, passes through the corresponding flow passage, and is output from the second output passage to the downstream of the circulation pipeline; the second low-pressure fluid in the second water delivery pipeline enters the pressure exchanger from the second input passage, passes through the corresponding flow passage, and is output from the first output passage to the second drain pipe;

[0034] When the rotor rotates, the first high-pressure fluid in the circulation pipeline enters the pressure exchanger from the first input passage, is depressurized by the second low-pressure fluid through the corresponding flow channel to form the first low-pressure fluid, and the first low-pressure fluid is discharged from the first output passage to the second drain pipe; the second low-pressure fluid in the second water supply pipeline enters the pressure exchanger from the second input passage, is pressurized by the first high-pressure fluid through the corresponding flow channel to form the second high-pressure fluid, and the second high-pressure fluid is input into the circulation pipeline from the corresponding second output passage.

[0035] Compared with the prior art, the advantages and positive effects of the present invention are:

[0036] The pressure exchanger involved in the present application has a connecting structure formed between the rotor and at least one end cover in the end cover assembly. The connecting structure is used to connect the input passage and the output passage on the corresponding end cover when the rotor rotates, so that the fluid pressure in the flow channel can be gradually loaded or released between the input and output passages, so that the pressure transfer forms a gradient between the ports corresponding to the input channel and the output channel of the end cover assembly; during the rotation of the rotor, the liquid carried in the flow channel and the pressure energy it possesses will be gradually released or loaded during the rotation process, avoiding sudden pressure changes, which is beneficial to eliminating cavitation caused by sudden pressure changes, increasing the pressure transfer time, and reducing vibration and noise.

[0037] 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

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. 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 creative work.

[0039] Figure 1 It is the overall structural diagram of the pressure exchanger proposed by the present invention;

[0040] Figure 2 yes Figure 1 The pressure exchanger split diagram in;

[0041] Figure 3 is a partial cutaway view of a pressure exchanger;

[0042] Figure 4 is a cross-sectional view of a pressure exchanger;

[0043] Figure 5 is a top view of the pressure exchanger;

[0044] Figure 6 is a structural diagram of the first end cover;

[0045] Figure 7 It is one of the second end cover structure diagrams;

[0046] Figure 8 This is the second structural diagram of the second end cover;

[0047] Fig. 9 is a schematic diagram of the structure of the third connecting recess on the rotor;

[0048] Fig.10 It is a schematic diagram of the fluid flow on the pressure exchanger when the rotor rotates;

[0049] Fig.11 It is one of the distribution diagrams of the contact recesses on the rotor;

[0050] Fig.12 This is the second distribution diagram of the contact recesses on the rotor;

[0051] Fig.13 This is another split schematic diagram of the pressure exchanger;

[0052] Fig.14 It is a schematic diagram of the fluid flow path of the water treatment system when the rotor is stationary;

[0053] Fig.15It is a schematic diagram of the fluid flow path of the water treatment system when the rotor rotates;

[0054] In the figure,

[0055] 10. Water pump parts;

[0056] 20. First water delivery pipeline; 21. High-pressure pump;

[0057] 30. Reverse osmosis membrane group; 31. First drainage pipe;

[0058] 40. Circulation pipeline; 41. Booster pump;

[0059] 50. Second water pipeline;

[0060] 60. pressure exchanger; 61. second drain pipe;

[0061] 100, sleeve member; 110, installation inner cavity;

[0062] 200, first end cover; 201, first high-pressure sealing surface; 202, first low-pressure sealing surface; 210, first input passage; 220, first output passage; 230, first connecting hole; 240, first connecting recess;

[0063] 300, second end cover; 301, second high-pressure sealing surface; 302, second low-pressure sealing surface; 310, second input passage; 320, second output passage; 330, second connecting hole; 340, second connecting recess;

[0064] 400, rotor; 401, first plane end surface; 402, second plane end surface; 410, flow passage; 420, center hole; 430, third connecting recess; 440, contact recess;

[0065] 500, tension rod; 510, fixing nut; 520, buffer pad. DETAILED DESCRIPTION

[0066] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0067] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present 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 should not be understood as a limitation on the present application.

[0068] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0069] In the description of this application, it should be noted that, 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 a mechanical connection, a direct connection, or an indirect connection 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 specific circumstances.

[0070] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0071] The disclosure below provides many different embodiments or examples to implement different structures of the present invention. In order to simplify the disclosure of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed.

[0072] refer to Figure 1-Figure 5The present application proposes a pressure exchanger 60, which includes a sleeve member 100, a rotor 400 and an end cover assembly, wherein a cylindrical mounting inner cavity 110 is formed in the sleeve member 100, the rotor 400 is cylindrical and is rotatably connected in the mounting inner cavity 110, and the end cover assembly includes a first end cover 200 and a second end cover 300, the first end cover 200 and the second end cover 300 are respectively connected to the two ends of the corresponding sleeve member 100, and are rotatably connected to the two end surfaces of the rotor 400.

[0073] Along the axis of the rotor 400 , a first plane end surface 401 and a second plane end surface 402 are respectively formed at both ends of the rotor 400 . The first plane end surface 401 is in contact with the first end cover 200 , and the second plane end surface 402 is in contact with the second end cover 300 .

[0074] At least two flow passages 410 penetrating the first plane end surface 401 and the second plane end surface 402 are formed on the rotor 400 , and each flow passage 410 is parallel to the axis of the rotor 400 .

[0075] The first end cover 200 is formed with a first inner end face facing the rotor 400 and a first outer end face away from the rotor 400. The first inner end face is in contact with the first plane end face 401. When the rotor 400 rotates, the first inner end face rotates relative to the first plane end face 401.

[0076] The second end cover 300 is formed with a second inner end face facing the rotor 400 and a second outer end face away from the rotor 400. The second inner end face is in contact with the second planar end face 402. When the rotor 400 rotates, the second inner end face rotates relative to the second planar end face 402.

[0077] refer to Figure 6-Figure 8 A first input passage 210 and a first output passage 220 are formed on the first end cover 200 , and a second input passage 310 and a second output passage 320 are formed on the second end cover 300 .

[0078] A communication structure is formed between the end cover assembly and the rotor 400 , and the communication structure can be specifically arranged between the first end cover 200 and the rotor 400 , or between the second end cover 300 and the rotor 400 .

[0079] Specifically, the communication structure may be formed on the first end cover 200 and / or the second end cover 300 , or may be provided on the rotor 400 .

[0080] For example, the communication structure is formed on the first inner end surface that contacts the first plane end surface 401 of the rotor 400 , or may be formed on the first plane end surface 401 that contacts the first inner end surface.

[0081] The communication structure may be formed on the second inner end surface in contact with the second planar end surface 402 of the rotor 400 , or may be formed on the second planar end surface 402 in contact with the second inner end surface.

[0082] When a connecting structure is formed between the first end cover 200 and the rotor 400 , the connecting structure is used to connect the adjacent first input passage 210 and the first output passage 220 when the rotor 400 rotates, so that the fluid pressure in the flow channel 410 is gradually loaded or released between the first input passage 210 and the first output passage 220 .

[0083] When a connecting structure is formed between the second end cover 300 and the rotor 400, the connecting structure is used to connect the adjacent second input passages 310 and second output passages 320 on the second end cover 300 when the rotor 400 rotates, so that the fluid pressure in the flow channel 410 can be gradually loaded or released between the second input passage 310 and the second output passage 320.

[0084] Specifically, in some embodiments, the communication structure is a first communication recess 240 formed on the first inner end surface. Along the rotation direction of the rotor 400 , the first communication recess 240 is formed between the first input passage 210 and the first output passage 220 .

[0085] In other embodiments, the communication structure is a second communication recess 340 formed on the second inner end surface. Along the rotation direction of the rotor 400 , the second communication recess 340 is formed between the second output passage 320 and the second input passage 310 .

[0086] In other words, along the rotation direction of the rotor 400, a first communicating recess 240 is formed between at least the first input passage 210 and the first output passage 220 on the first inner end surface; and / or

[0087] A second communication recess 340 is formed between at least the second output passage 320 and the second input passage 310 on the second inner end surface along the rotation direction of the rotor 400 .

[0088] When the rotor 400 rotates, the first input passage 210 is used to input the first high-pressure fluid into the rotor 400, the first output passage 220 is used to output the first low-pressure fluid after decompression from the rotor 400, the second input passage 310 is used to input the second low-pressure fluid into the rotor 400, and the second output passage 320 is used to output the second high-pressure fluid after supercharging from the rotor 400.

[0089] When the rotor 400 is stationary, the first high-pressure fluid input from the first input passage 210 passes through the corresponding flow channel 410 and is output from the second output passage 320, and the second low-pressure fluid input from the first input passage 210 passes through the corresponding flow channel 410 and is output from the first output channel.

[0090] The port of the first input passage 210 on the first inner end surface is defined as a first input port, and the port of the first output passage 220 on the first inner end surface is defined as a first output port.

[0091] The port of the second input passage 310 on the second inner end surface is a second input port, and the port of the second output passage 320 on the second inner end surface is a second output port.

[0092] On the first inner end surface, along the rotation direction of the rotor 400 , a first high-pressure sealing surface 201 is formed between the first input port and the first output port, and a first low-pressure sealing surface 202 is formed between the first output port and the first input port.

[0093] On the second inner end surface, along the rotation direction of the rotor 400 , a second high-pressure sealing surface 301 is formed between the second output port and the second input port, and a second low-pressure sealing surface 302 is formed between the second input port and the second output port.

[0094] In other words, combining Figure 6 , Figure 8 The pressure exchanger 60 of the present application is provided with a first connecting recess 240 at least on the first high-pressure sealing surface 201 , and / or a second connecting recess 340 is formed on the second high-pressure sealing surface 301 .

[0095] In some embodiments of the present application, the first connecting recess 240 and the second connecting recess 340 may be provided on the first low-pressure sealing surface 202 and the second low-pressure sealing surface 302 in addition to being provided on the first high-pressure sealing surface 201 and the second high-pressure sealing surface 301 .

[0096] That is, along the rotation direction of the rotor 400, a first connecting recess 240 is also formed between the first output passage 220 and the first input passage 210 on the first inner end surface; and / or

[0097] A second communication recess 340 is also formed between at least the second input passage 310 and the second output passage 320 on the second inner end surface along the rotation direction of the rotor 400 .

[0098] The first connecting recess 240 is used to realize pressure transmission between the ports corresponding to the first input passage 210 and the first output passage 220, and the second connecting recess 340 is used to realize pressure transmission between the ports corresponding to the second output passage 320 and the second input passage 310, so that the pressure transmission forms a gradient between the above-mentioned ports. During the rotation of the rotor 400, the liquid carried in the flow channel 410 and the pressure energy it possesses will be gradually released or loaded during the rotation, avoiding sudden pressure changes, which is beneficial to eliminating cavitation caused by sudden pressure changes, increasing the pressure transmission time, and reducing vibration and noise.

[0099] In some embodiments of the present application, the first connecting recess 240 includes at least one arc groove formed between the first input passage 210 and the first output passage 220 , and the center of the arc groove coincides with the center of the first inner end surface.

[0100] The center of the first connecting recess 240 coincides with the center of the first inner end surface, so that as the rotor 400 rotates, part of the pressure energy carried in the first high-pressure fluid output from the first input passage 210 is released more smoothly and steadily to the first low-pressure fluid.

[0101] The second communication recess 340 includes at least one arc groove formed between the second input passage 310 and the second output passage 320 , and the center of the arc groove coincides with the center of the second inner end surface.

[0102] The center of the second connecting recess 340 coincides with the center of the second inner end surface, so that as the rotor 400 rotates, part of the pressure energy carried in the second high-pressure fluid output from the second input passage 310 is released more smoothly and steadily to the second low-pressure fluid.

[0103] In order to improve the pressure release effect, along the radial direction of the first inner end surface, the first connecting recess 240 includes a plurality of arc grooves arranged at intervals; along the radial direction of the second inner end surface, the second connecting recess 340 includes a plurality of arc grooves arranged at intervals.

[0104] The centers of the circular arc grooves of the first connecting recess 240 coincide with each other, and the centers of the circular arc grooves of the second connecting recess 340 coincide with each other.

[0105] The bottom cross-sections of the first connecting recess 240 and the second connecting recess 340 are both smooth arc structures. The arc grooves included in the first connecting recess 240 and the second connecting recess 340 are smooth in shape, which makes the pressure release process smoother and reduces the generation of noise.

[0106] For example but not limited to, a plurality of flow passages 410 are arranged at equal angles on the rotor 400, two first input passages 210 and two first output passages 220 are alternately arranged on the first end cover 200, and two second input passages 310 and two second output passages 320 are alternately arranged on the second end cover 300; during each rotation of the rotor 400, the first port of each flow passage 410 is alternately connected to the first input passage 210 and the first output passage 220 twice, and the second port of each flow passage 410 is alternately connected to the second input passage 310 and the second output passage 320 twice, so as to realize two pressurization processes of each flow passage 410.

[0107] The first input passage 210 and the first output passage 220 are arc-shaped channels distributed on the first end cover 200 with the center of the circle of the first end cover 200 as the center.

[0108] The second input passage 310 and the second output passage 320 are arc-shaped passages circumferentially distributed on the second end cover 300 with the center of the second end cover 300 as the center, so as to be connected with each flow passage 410 during the rotation of the rotor 400.

[0109] The first connecting recess 240 and the second connecting recess 340 are provided on the first high-pressure sealing surface 201 and the second high-pressure sealing surface 301, so that the first input port is connected with the first output port, and the first output port is connected with the second output port. All positions between the input port and the output port can be continuously pressurized or depressurized, the time of pressure loading and reducing is longer, the pressure is reduced, and the cavitation and noise are greatly reduced.

[0110] In addition, the first connecting recess 240 and the second connecting recess 340 make the fluid concentrations of the high and low pressure ports (input and output ports) of the same end cover (first end cover 200, second end cover 300) close, which will not increase the fluid concentration entering the membrane group inlet and bring negative effects.

[0111] When the pressure exchanger 60 is working normally, the rotor 400 rotates, and the liquid carried in the flow channel 410 of the rotor 400 will experience high-pressure and low-pressure switching. During the high-pressure and low-pressure switching process, the high-pressure and low-pressure liquids will produce impact water hammer effects and cavitation. When the high-pressure fluid (the first high-pressure fluid and / or the second high-pressure fluid) carried by the rotor 400 rotates in the flow channel 410 to the corresponding sealing surface area, it is suddenly closed, generating vibration and noise.

[0112] Take the first end cover 200 as an example: when the pressure exchanger 60 is working normally, the rotor 400 rotates, and the liquid carried in the flow channel 410 of the rotor 400 undergoes a conversion between high pressure and low pressure. The first high-pressure fluid is input from the first input passage 210 through the first input port into the flow channel 410 of the rotor 400. As the rotor 400 rotates, the first high-pressure fluid output from the first input passage 210 is isolated by the first high-pressure sealing surface 201. Due to the presence of the first connecting recess 240 on the first high-pressure sealing surface 201, the pressure of the first high-pressure fluid can be transmitted without a sudden drop, causing problems such as noise and cavitation.

[0113] The first connecting recess 240 allows the pressure transfer to form a gradient between the high-pressure port and the low-pressure port, thereby solving the problem of sudden pressure changes and facilitating the elimination of cavitation problems caused by sudden pressure changes. The pressure transfer time is increased, and vibration and noise are also greatly reduced.

[0114] Combination Fig. 9 , Fig.10 In other embodiments, the communication structure is disposed on the first planar end surface 401 and / or the second planar end surface 402 of the rotor 400 , and the communication structure is a third communication recess 430 formed between adjacent flow channels 410 .

[0115] The third communication recess 430 includes a plurality of arc grooves arranged at intervals along the radial direction of the rotor 400 .

[0116] The center of the arc-shaped groove on the rotor 400 also coincides with the rotation center of the rotor 400, so that part of the pressure energy carried in the high-pressure fluid output from the corresponding end cover can be released to the low-pressure fluid more smoothly and steadily.

[0117] Taking the connecting structure formed on the first plane end face 401 as an example, the third connecting recess 430 on the first plane end face 401 can also realize the pressure transmission between the ports corresponding to the first input passage 210 and the first output passage 220 on the first end cover 200, so that the pressure transmission forms a gradient between the above-mentioned ports. Then, during the rotation of the rotor 400, the liquid carried in the flow channel 410 and the pressure energy it possesses will be gradually released or loaded during the rotation, avoiding pressure mutation, which is conducive to eliminating cavitation caused by pressure mutation.

[0118] Similarly, when the communication structure is formed on the second planar end surface 402 , the third communication recess 430 on the second planar end surface 402 can also realize pressure transmission between the corresponding ports of the second output passage 320 and the second input passage 310 on the second end cover 300 .

[0119] In some embodiments of the present application, along the axis of the rotor 400, the depth of the arc-shaped groove is less than 0.5 mm to avoid the problem of pressure relief between the high-pressure fluid and the low-pressure fluid caused by an overly deep arc-shaped groove.

[0120] Combined with Figure 7 , in some other embodiments, along the radial direction of the rotor 400, the width dimension L of the arc-shaped groove and the width D of the flow-through channel 410 satisfy: L < D / 2, to avoid the problem of mutual influence between the high-pressure fluid and the low-pressure fluid caused by an overly large size of the arc-shaped groove.

[0121] Refer to Figure 11-13 , in some embodiments of the present application, a plurality of contact recesses 440 are dispersedly arranged on the first planar end face 401 and / or the second planar end face 402 of the rotor 400.

[0122] When the rotor 400 rotates, the rotor 400 is supported in the axial direction of the rotor 400 by the first inner end face on the first end cap 200 and the second inner end face on the second end cap 300.

[0123] During the rotation of the rotor 400, the outer wall of the rotor 400 is supported by the side wall of the installation inner cavity 110 of the sleeve member 100.

[0124] In some embodiments, a plurality of contact recesses 440 are dispersedly arranged on the outer wall of the rotor 400.

[0125] The design of the contact recesses 440 enables the outer wall of the rotor 400 to maintain a relatively small gap with the inner wall of the sleeve member 100, and at the same time provides sufficient pressure and spacing to prevent contact and wear between components, to minimize or even prevent contact, and at the same time, the relatively small gap can be used to control leakage.

[0126] In some other embodiments, a plurality of contact recesses 440 are dispersedly arranged on the first planar end face 401 and / or the second planar end face 402 of the rotor 400.

[0127] The contact recesses 440 arranged on the first planar end face 401 and / or the second planar end face 402 enable the two end faces of the rotor 400 to maintain a relatively small gap with the corresponding first end cap 200 or the second end face, and at the same time provide sufficient pressure and spacing to prevent contact and wear between components, to minimize or even prevent contact.

[0128] A through central hole 420 is formed on the rotor 400, a through first connection hole 230 is formed on the first end cap 200, and a through second connection hole 330 is formed on the second end cap 300. The central hole 420, the first connection hole 230, and the second connection hole 330 penetrate through each other.

[0129] The rotor 400 is connected between the first end cover 200 and the second end cover 300 through a tensioning rod 500. The tensioning rod 500 is connected in the center hole 420. Both ends of the tensioning rod 500 extend to the outside of the first end cover 200 and the second end cover 300 respectively, connecting the first end cover 200, the rotor 400 and the second end cover 300.

[0130] Specifically, a limiting portion is provided on the tension rod 500 , and the limiting portion is respectively located on the outer surface of the first end cover 200 and the second end cover 300 away from the rotor 400 , and is used to limit the first end cover 200 and the second end cover 300 .

[0131] An external thread is formed at a corresponding position of the tension rod 500 , and the limiting portion includes a buffer pad 520 and a fixing nut 510 . The fixing nut 510 is threadedly connected to the tension rod 500 , and the buffer pad 520 is located between the fixing nut 510 and the first end cover 200 or the second end cover 300 .

[0132] Combination Fig.14 , Fig.15 The present application also proposes a water treatment system, which includes any of the pressure exchangers 60 mentioned above, and the water treatment system also includes a water pump 10, a first water supply pipeline 20, a circulation pipeline 40, a reverse osmosis membrane group 30 and a second water supply pipeline 50.

[0133] One end of the first water supply pipeline 20 is connected to the water pump 10 , and the other end is connected to the input end of the reverse osmosis membrane group 30 . A high-pressure pump 21 is provided on the first water supply pipeline 20 , and the low-pressure output end of the reverse osmosis membrane group 30 is connected to the first drain pipe 31 .

[0134] One end of the circulation pipeline 40 is connected to the high-pressure output end of the reverse osmosis membrane group 30, and the other end is connected to the first water supply pipeline 20 downstream of the high-pressure pump 21 through the pressure exchanger 60. A booster pump 41 is also provided on the first water supply pipeline 20, and the booster pump 41 is arranged between the pressure exchanger 60 and the first water supply pipeline 20.

[0135] One end of the second water delivery pipeline 50 is connected to the water pump 10 , and the other end is connected to the pressure exchanger 60 .

[0136] Among them, the first input passage 210 of the pressure exchanger 60 is connected to the high-pressure output end of the reverse osmosis membrane group 30 through the circulation pipeline 40, and the first output passage 220 is connected to the second drain pipe 61; the second input passage 310 is connected to the water pump part 10 through the second water supply pipeline 50, and the second output passage 320 is connected to the booster pump 41 through the circulation pipeline 40.

[0137] Combination Fig.14When the rotor 400 is stationary, the first high-pressure fluid in the circulation pipeline 40 enters the pressure exchanger 60 from the first input passage 210, passes through the corresponding flow passage 410, and is output from the second output passage 320 to the downstream of the circulation pipeline 40; the second low-pressure fluid in the second water delivery pipeline 50 enters the pressure exchanger 60 from the second input passage 310, passes through the corresponding flow passage 410, and is output from the first output passage 220 to the second drain pipe 61;

[0138] Combination Fig.15 When the rotor 400 rotates, the first high-pressure fluid in the circulation pipeline 40 enters the pressure exchanger 60 from the first input passage 210, is depressurized by the second low-pressure fluid through the corresponding flow channel 410 to form the first low-pressure fluid, and the first low-pressure fluid is discharged from the first output passage 220 to the second drain pipe 61; the second low-pressure fluid in the second water supply pipeline 50 enters the pressure exchanger 60 from the second input passage 310, is pressurized by the first high-pressure fluid through the corresponding flow channel 410 to form the second high-pressure fluid, and the second high-pressure fluid is input into the circulation pipeline 40 from the corresponding second output passage 320.

[0139] Specifically, the first high-pressure fluid can be supplied to the pressure exchanger 60, enter the first input passage 210 on the first end cover 200, and enter the flow passage 410 of the rotor 400 through the first input port. When the rotor 400 rotates, the flow passage 410 is positioned to selectively communicate with the first input port on the first end cover 200, so that at least a portion of the fluid can enter the first input passage 210, and pressurize the second low-pressure fluid input from the second input passage 310 on the second end cover 300 into the corresponding flow passage 410.

[0140] The second low-pressure fluid is supplied to the pressure exchanger 60 through the second input passage 310 in the second end cover 300 . As the rotor 400 rotates, the second low-pressure fluid flow is positioned to selectively communicate with one or more flow passages 410 , so that at least a portion of the fluid can enter the flow passages 410 .

[0141] As described above, the second low-pressure fluid entering the flow channel 410 is pressurized by the first high-pressure fluid to form a second high-pressure fluid, which is at least partially output from the flow channel 410 through the second output passage 320 .

[0142] As the rotor 400 rotates, a second low-pressure fluid (eg, to be pressurized) may be supplied into the flow passage 410 through the second input passage 310 on the second end cover 300 .

[0143] As described above, the first high-pressure fluid previously supplied to the flow passage 410 has pressurized the second low-pressure fluid, and the pressure of the first high-pressure fluid is reduced to form the first low-pressure fluid, which is discharged from the first low-pressure passage through the first end cover 200 and can leave the pressure exchange device. This process is repeated in a similar manner to supply fluid, pressurize the fluid, and then discharge the pressurized and used fluid.

[0144] Wherever possible, the various aspects and features described and shown in the specification may be applied separately and these separate aspects may be made the subject of divisional applications.

[0145] In the description of the above embodiments, specific features, structures, materials or characteristics may be combined in a suitable manner in any one or more embodiments or examples.

[0146] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within 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: A sleeve member having a mounting inner cavity formed therein; A rotor rotatably connected in the mounting inner cavity, wherein along the axis of the rotor, two ends of the rotor are respectively formed with a first plane end surface and a second plane end surface, and at least two flow passages penetrating the first plane end surface and the second plane end surface are formed on the rotor, and each of the flow passages is parallel to the axis of the rotor; an end cover assembly, comprising a first end cover and a second end cover, wherein the first end cover and the second end cover are respectively located at two ends of the sleeve member; the first end cover is formed with a first inner end surface facing the rotor and a first outer end surface away from the rotor, the second end cover is formed with a second inner end surface facing the rotor and a second outer end surface away from the rotor, the first end cover is formed with a first input passage and a first output passage, and the second end cover is formed with a second input passage and a second output passage; When the rotor rotates, the first input passage is used to input a first high-pressure fluid, the first output passage is used to output a first low-pressure fluid after decompression, the second input passage is used to input a second low-pressure fluid, and the second output passage is used to output a second high-pressure fluid after pressurization; Wherein, a connecting structure is formed between the first end cover and the rotor, and the connecting structure is used to connect the adjacent first input passage and the first output passage when the rotor rotates, so that the fluid pressure in the flow passage is gradually loaded or released between the first input passage and the first output passage; and / or A connecting structure is formed between the second end cover and the rotor, and the connecting structure is used to connect the adjacent second input passage and the second output passage on the second end cover when the rotor rotates, so that the fluid pressure in the flow channel can be gradually loaded or released between the second input passage and the second output passage.

2. The pressure exchanger according to claim 1, characterized in that The communication structure is a first communication recess formed on the first inner end surface, and the first communication recess is formed between the first input passage and the first output passage along the rotation direction of the rotor; and / or The communication structure is a second communication recess formed on the second inner end surface, and the second communication recess is formed between the second output passage and the second input passage along the rotation direction of the rotor.

3. The pressure exchanger according to claim 2, characterized in that A first connecting recess is also formed between the first output passage and the first input passage on the first inner end surface along the rotation direction of the rotor; and / or A second communication recess is also formed on the second inner end surface at least between the second input passage and the second output passage along the rotation direction of the rotor.

4. The pressure exchanger according to claim 3, characterized in that The first connecting recess comprises at least one arc groove formed between the first input passage and the first output passage, and the center of the arc groove coincides with the center of the first inner end surface; and / or The second communicating recess includes at least one arc groove formed between the second output passage and the second input passage, and the center of the arc groove coincides with the center of the second inner end surface.

5. The pressure exchanger according to claim 4, characterized in that Along the radial direction of the first inner end surface, the first communicating recess includes a plurality of arc grooves arranged at intervals; and / or Along the radial direction of the second inner end surface, the second communicating recess includes a plurality of arc grooves arranged at intervals.

6. The pressure exchanger according to claim 1, characterized in that The communication structure is arranged on the first plane end surface and / or the second plane end surface of the rotor, and the communication structure is a third communication recess formed between adjacent flow channels.

7. The pressure exchanger according to claim 6, characterized in that Along the radial direction of the rotor, the third communicating recess includes a plurality of arc grooves arranged at intervals.

8. The pressure exchanger according to claim 5, characterized in that Along the axis of the rotor, the depth of the arc groove is less than 0.5 mm; Along the radial direction of the rotor, the width L of the arc groove and the width D of the flow passage satisfy: L <D / 2。 9. The pressure exchanger according to claim 1, characterized in that A plurality of contact recesses are dispersedly arranged on the first planar end surface and / or the second planar end surface of the rotor.

10. The pressure exchanger according to claim 1, characterized in that A plurality of contact recesses are dispersedly arranged on the outer wall of the rotor.

11. A water treatment system, characterized in that: The water treatment system comprises the pressure exchanger according to any one of claims 1 to 10, and further comprises: Water pump parts; A first water delivery pipeline, one end of which is connected to the water pump component and the other end is connected to the input end of the reverse osmosis membrane group. A high-pressure pump is provided on the first water delivery pipeline, and the low-pressure output end of the reverse osmosis membrane group is connected to a first drain pipe; A circulation pipeline, one end of which is connected to the high-pressure output end of the reverse osmosis membrane group, and the other end of which is connected to the first water delivery pipeline downstream of the high-pressure pump through the pressure exchanger, and a booster pump is also provided on the circulation pipeline, and the booster pump is provided between the pressure exchanger and the first water delivery pipeline; A second water delivery pipeline, one end of which is connected to the water pump member, and the other end of which is connected to the pressure exchanger; The first input passage of the pressure exchanger is connected to the high-pressure output end of the reverse osmosis membrane group through a circulation pipeline, and the first output passage is connected to the second drain pipe; the second input passage is connected to the water pump through a second water delivery pipeline, and the second output passage is connected to the booster pump through a circulation pipeline; When the rotor is stationary, the first high-pressure fluid in the circulation pipeline enters the pressure exchanger from the first input passage, passes through the corresponding flow passage, and is output from the second output passage to the downstream of the circulation pipeline; the second low-pressure fluid in the second water delivery pipeline enters the pressure exchanger from the second input passage, passes through the corresponding flow passage, and is output from the first output passage to the second drain pipe; When the rotor rotates, the first high-pressure fluid in the circulation pipeline enters the pressure exchanger from the first input passage, is depressurized by the second low-pressure fluid through the corresponding flow channel to form the first low-pressure fluid, and the first low-pressure fluid is discharged from the first output passage to the second drain pipe; the second low-pressure fluid in the second water supply pipeline enters the pressure exchanger from the second input passage, is pressurized by the first high-pressure fluid through the corresponding flow channel to form the second high-pressure fluid, and the second high-pressure fluid is input into the circulation pipeline from the corresponding second output passage.

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