Self-driven rotary pressure energy recovery device with built-in flow guide impeller structure

Abstract

The invention discloses a self-driven rotary pressure energy recovery device with a built-in guide impeller structure, which comprises an outer sleeve, an upper end cover, a lower end cover and a rotor, the rotor is coaxially and rotatably mounted in the outer sleeve, the rotor is in clearance fit with the outer sleeve, the upper end cover is hermetically connected to one end of the outer sleeve, and the lower end cover is hermetically connected to the other end of the outer sleeve. The lower end cover is connected to the other end of the outer sleeve in a sealed mode, one end of the rotor is coaxially connected with an upper impeller in a transmission mode, and the other end of the rotor is coaxially connected with a lower impeller in a transmission mode. The impeller structure is arranged in the rotor, high-pressure and low-pressure fluid flows into the impact impeller through the inlet, the fluid speed is converted into tangential speed, the rotor is pushed to rotate, and kinetic energy is provided for rotation of the rotor, so that self-driving of the rotor is achieved, the rotating speed is stable, and kinetic energy does not need to be additionally provided for the device; and the stability and reliability of the whole system are improved, so that the device can operate under wider conditions.

Description

Technical Field

[0001] The invention relates to the technical field of seawater desalination, and more specifically to a self-driven rotary pressure energy recovery device with a built-in guide impeller structure. Background Art

[0002] In the process of reverse osmosis desalination, petrochemical industry, industrial reverse osmosis water treatment system, etc., waste liquid with high pressure is often discharged directly or throttled. Since the discharged liquid still has high pressure energy, it causes huge energy waste and increases the overall energy consumption of the process.

[0003] Energy saving is the key to the success of reverse osmosis desalination technology, but energy consumption is still the most important factor limiting the operating cost of the system. In the entire process of reverse osmosis desalination, the residual pressure of high-pressure brine after the reverse osmosis membrane is as high as 5.8-6.0MPa. How to utilize the pressure energy of this part of high-pressure fluid has become a key step in reducing the energy consumption of reverse osmosis desalination technology. Summary of the invention

[0004] To this end, the technical problem to be solved by the present invention is to provide a self-driven rotary pressure energy recovery device with a built-in guide impeller structure that has a simple structure, does not require external power, reduces failure rate and maintenance costs, and can better adapt to flow changes.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: a self-driven rotary pressure energy recovery device with a built-in guide impeller structure, comprising an outer sleeve, an upper end cover, a lower end cover and a rotor, wherein the rotor is coaxially rotatably installed in the outer sleeve, the rotor and the outer sleeve are clearance-matched, the upper end cover is sealingly connected to one end of the outer sleeve, the lower end cover is sealingly connected to the other end of the outer sleeve, an upper impeller is coaxially connected to one end of the rotor, and a lower impeller is coaxially connected to the other end of the rotor, and a gap is formed between the blade ends of the upper impeller and the inner wall surface of the sleeve, The blades of the upper impeller and the inner wall of the upper end cover have gaps, and the blades of the lower impeller and the inner wall of the lower end cover have gaps; an energy conversion channel is opened in the rotor, one end of the energy conversion channel is connected to the upper impeller position, and the other end of the energy conversion channel is connected to the lower impeller position, the upper end cover is connected with a high-pressure fluid inlet and a low-pressure fluid outlet, and the lower end cover is connected with a high-pressure fluid outlet and a low-pressure fluid inlet; high-pressure waste liquid enters the outer sleeve through the high-pressure fluid inlet to drive the upper impeller to rotate, and low-pressure seawater enters the outer sleeve through the low-pressure fluid inlet to drive the lower impeller to rotate, and the upper impeller and the lower impeller synchronously drive the rotor to rotate.

[0006] In the above-mentioned self-driven rotary pressure energy recovery device with a built-in guide impeller structure, a first liquid storage chamber is formed between two adjacent blades of the upper impeller, a second liquid storage chamber is formed between two adjacent blades of the lower impeller, and both ends of the energy conversion flow channel are fluidly connected to the first liquid storage chamber and the second liquid storage chamber respectively; when the rotor rotates: one of the first liquid storage chambers is fluidly connected to the high-pressure fluid inlet and the low-pressure fluid outlet in sequence, and one of the second liquid storage chambers is fluidly connected to the high-pressure fluid outlet and the low-pressure fluid inlet in sequence.

[0007] In the above-mentioned self-driven rotary pressure energy recovery device with a built-in guide impeller structure, the energy conversion flow channel is arranged along the axial direction of the rotor and passes through both ends of the rotor, the high-pressure fluid inlet and the high-pressure fluid outlet correspond to each other in the axial direction, and the low-pressure fluid outlet and the low-pressure fluid inlet correspond to each other in the axial direction.

[0008] In the above-mentioned self-driven rotary pressure energy recovery device with a built-in guide impeller structure, more than two transducing flow channels are opened in the rotor at equal intervals along its circumferential direction, and any one of the first liquid storage chambers is fluid-conducted with the second liquid storage chamber through at least one transducing flow channel.

[0009] In the above-mentioned self-driven rotary pressure energy recovery device with a built-in guide impeller structure, a partition is formed between two adjacent energy conversion channels, the blade thickness of the upper impeller or the lower impeller is equal to the thickness of the partition, and the blades of the upper impeller or the lower impeller are connected to the partition.

[0010] In the above-mentioned self-driven rotary pressure energy recovery device with a built-in guide impeller structure, the length of the energy conversion channel is 220 mm, and the lengths of the upper impeller and the lower impeller are 40 mm.

[0011] In the above-mentioned self-driven rotary pressure energy recovery device with a built-in guide impeller structure, the upper impeller and the lower impeller have the same structure and are arranged in mirror symmetry with respect to a cross section perpendicular to the rotor axis.

[0012] In the above-mentioned self-driven rotary pressure energy recovery device with a built-in guide impeller structure, the angle between the upper impeller blades and the rotor axis is 45 to 80 degrees, and the angle between the lower impeller and the rotor axis is also 45 to 80 degrees.

[0013] In the above-mentioned self-driven rotary pressure energy recovery device with a built-in guide impeller structure, the inner diameters of the high-pressure fluid inlet, the low-pressure fluid outlet, and the high-pressure fluid outlet and the low-pressure fluid inlet are the same, and are all larger than the maximum spacing between two adjacent blades of the upper impeller or the lower impeller.

[0014] The above-mentioned self-driven rotary pressure energy recovery device with a built-in guide impeller structure, the gap between the outer circumferential surface of the rotor and the inner circumferential surface of the outer sleeve forms a lubrication gap, a lubrication groove is opened on the middle part of the outer circumferential surface of the rotor along its circumferential direction, the lubrication gap is fluid-connected with the lubrication groove, a drainage hole is opened through the side wall of the outer sleeve at a position corresponding to the lubrication groove, the drainage hole is fluid-connected with the lubrication groove, the length of the lubrication groove is 50mm, and the aperture of the drainage hole is 10mm. During the operation of the rotor, the working liquid will fill the lubrication groove to play a role of hydraulic lubrication, thereby avoiding damaging friction between the rotor and the rotor sleeve during operation; a pressure equalizing groove is opened on the side of the upper end cover that contacts the end of the outer sleeve along its circumferential direction. , a part of the pressure equalizing groove is located between the upper end cover and the end face of the outer sleeve, and another part of the pressure equalizing groove is in fluid communication with the outer sleeve; another pressure equalizing groove is opened along the circumferential direction of the side surface of the lower end cover in contact with the end of the outer sleeve, and a part of the other pressure equalizing groove is located between the lower end cover and the end face of the outer sleeve, and another part of the other pressure equalizing groove is in fluid communication with the outer sleeve; the depth of the pressure equalizing groove is 2mm and the width is 1.5mm. By setting the pressure equalizing groove, the system pressure is balanced when the rotor rotates at high speed, and the resistance loss of the fluid and the pressure fluctuation generated during the flow process are reduced; a central shaft is coaxially fixedly connected in the rotor, one end of the central shaft is rotatably connected to the upper end cover, and the other end of the central shaft is rotatably connected to the lower end cover.

[0015] The technical solution of the present invention achieves the following beneficial technical effects:

[0016] 1. In the present invention, through the built-in impeller structure of the rotor, high and low pressure fluids flow into the impact impeller through the inlet, and the fluid velocity is converted into tangential velocity, which drives the rotor to rotate and provides kinetic energy for the rotor rotation, thereby realizing self-driving of the rotor and achieving stable speed. Therefore, there is no need to provide additional kinetic energy for the device, which improves the stability and reliability of the entire system and enables the device to operate under a wider range of conditions.

[0017] 2. In the present invention, the rotor starting process is completed by fluid self-driving, and the impeller inclination angle can be controlled to adjust the rotor speed through the matching relationship between flow velocity and speed. This design can better adapt to changing pressure and flow conditions under different working conditions, maintain efficient operation while ensuring stable pressurized water supply.

[0018] 3. In the present invention, through the integrated design of the rotor and impeller structure, and the modular design of the device, the structure is simple, the operability is good, the convenience is good, the service life is long and the maintenance requirements are low, and the complexity and cost of operation are reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A front view structural schematic diagram of the present invention;

[0020] Figure 2 A schematic diagram of the structure of the present invention from top view;

[0021] Figure 3 The present invention Figure 2 Schematic diagram of the cross section at AA;

[0022] Figure 4 The present invention Figure 2 Schematic diagram of the cross section at BB;

[0023] Figure 5 A schematic diagram of the upper impeller and the lower impeller of the present invention being installed on the rotor;

[0024] Figure 6 A schematic diagram of a three-dimensional cross-sectional structure of the present invention;

[0025] Figure 7 A schematic diagram of the three-dimensional structure of the rotor of the present invention;

[0026] Figure 8 A partial cross-sectional schematic diagram of the upper impeller and the lower impeller of the present invention being installed on the rotor;

[0027] Fig. 9 A partial schematic diagram of the connection between the upper impeller and the lower impeller and the partition of the present invention;

[0028] Fig.10 A partial schematic diagram of the pressure equalizing tank of the present invention.

[0029] The reference numerals in the figure are as follows: 1-outer sleeve; 2-upper end cover; 21-high-pressure fluid inlet; 22-low-pressure fluid outlet; 3-lower end cover; 31-high-pressure fluid outlet; 32-low-pressure fluid inlet; 4-rotor; 5-center axis; 6-upper impeller; 7-lower impeller; 8-energy conversion channel; 9-pressure equalizing groove; 10-lubrication groove; 11-drainage hole; 12-first liquid storage chamber; 13-second liquid storage chamber; 14-partition. DETAILED DESCRIPTION

[0030] In this embodiment, a self-driven rotary pressure energy recovery device with a built-in guide impeller structure is provided. Figure 1 , Figure 3As shown, it includes an outer sleeve 1, an upper end cover 2, a lower end cover 3 and a rotor 4, the rotor 4 is coaxially rotatably installed in the outer sleeve 1, a central shaft 5 is coaxially fixedly connected in the rotor 4, one end of the central shaft 5 is rotatably connected to the upper end cover 2, and the other end of the central shaft 5 is rotatably connected to the lower end cover 3, the rotor 4 and the outer sleeve 1 are clearance-matched, the upper end cover 2 is sealed and connected to one end of the outer sleeve 1, and the lower end cover 3 is sealed and connected to the other end of the outer sleeve 1 On the end, one end of the rotor 4 is coaxially connected to an upper impeller 6, and the other end of the rotor 4 is coaxially connected to a lower impeller 7. The blade ends of the upper impeller 6 and the blade ends of the lower impeller 7 have gaps with the inner wall surface of the sleeve 1, the blades of the upper impeller 6 have gaps with the inner wall surface of the upper end cover 2, and the blades of the lower impeller 7 have gaps with the inner wall surface of the lower end cover 3. On the premise that the rotor 4, the upper impeller 6 and the lower impeller 7 can rotate normally The smaller the gaps at each location, the better; a transducer channel 8 is provided in the rotor 4, one end of the transducer channel 8 is connected to the position of the upper impeller 6, and the other end of the transducer channel 8 is connected to the position of the lower impeller 7. The upper end cover 2 is connected with a high-pressure fluid inlet 21 and a low-pressure fluid outlet 22, and the lower end cover 3 is connected with a high-pressure fluid outlet 31 and a low-pressure fluid inlet 32; high-pressure waste liquid enters the outer sleeve 1 through the high-pressure fluid inlet 21 to drive the upper impeller 6 to rotate, and low-pressure seawater enters the outer sleeve 1 through the low-pressure fluid inlet 32 ​​to drive the lower impeller 7 to rotate, and the upper impeller 6 and the lower impeller 7 synchronously drive the rotor 4 to rotate. Through the built-in impeller structure of the rotor, high and low pressure fluids flow into the impact impeller through the inlet, and the fluid velocity is converted into tangential velocity, which drives the rotor to rotate, providing kinetic energy for the rotor rotation, thereby realizing rotor self-drive and achieving speed stability. Therefore, there is no need to provide additional kinetic energy for the device, which improves the stability and reliability of the entire system, so that the device can operate under a wider range of conditions.

[0031] like Figure 3 , Figure 5 As shown, a first liquid storage chamber 12 is formed between two adjacent blades of the upper impeller 6, a second liquid storage chamber 13 is formed between two adjacent blades of the lower impeller 7, and both ends of the energy conversion channel 8 are fluidly connected to the first liquid storage chamber 12 and the second liquid storage chamber 13 respectively; when the rotor 4 rotates: one of the first liquid storage chambers 12 is fluidly connected to the high-pressure fluid inlet 21 and the low-pressure fluid outlet 22 in sequence, and one of the second liquid storage chambers 13 is fluidly connected to the high-pressure fluid outlet 31 and the low-pressure fluid inlet 32 ​​in sequence.

[0032] like Figure 3As shown, the energy conversion channel 8 is arranged along the axial direction of the rotor 4 and passes through the two ends of the rotor 4, the high-pressure fluid inlet 21 and the high-pressure fluid outlet 31 correspond to each other in the axial direction, and the low-pressure fluid outlet 22 and the low-pressure fluid inlet 32 ​​correspond to each other in the axial direction.

[0033] like Figure 5 , Figure 7 As shown, the rotor 4 is provided with 16 and energy conversion channels 8 at equal intervals along its circumferential direction, and any one of the first liquid storage chambers 12 is fluidically connected to the second liquid storage chamber 13 through two energy conversion channels 8 .

[0034] like Figure 7 , Figure 8 , Fig. 9 As shown, a partition 14 is formed between two adjacent energy conversion channels 8, the blade thickness of the upper impeller 6 or the lower impeller 7 is equal to the thickness of the partition 14, and the blades of the upper impeller 6 or the lower impeller 7 are connected to the partition 14, the length of the energy conversion channel 8 is 220 mm, and the lengths of the upper impeller 6 and the lower impeller 7 are 40 mm.

[0035] like Figure 5 As shown, the upper impeller 6 and the lower impeller 7 have the same structure and are arranged in mirror symmetry with respect to a cross section perpendicular to the axis of the rotor 4. The angle between the blades of the upper impeller 6 and the axis of the rotor 4 is 45 to 80 degrees, and the angle between the lower impeller 7 and the axis of the rotor 4 is also 45 to 80 degrees.

[0036] like Figure 1 , Figure 2 As shown, the inner diameters of the high-pressure fluid inlet 21 , the low-pressure fluid outlet 22 , the high-pressure fluid outlet 31 and the low-pressure fluid inlet 32 ​​are the same and are all larger than the maximum distance between two adjacent blades of the upper impeller 6 or the lower impeller 7 .

[0037] like Figure 3 , 4 As shown in Figures 5 and 6, a lubrication gap is formed between the outer circumferential surface of the rotor 4 and the inner circumferential surface of the outer sleeve 1. A lubrication groove 10 is provided in the middle of the outer circumferential surface of the rotor 4 along its circumferential direction. The lubrication gap is in fluid communication with the lubrication groove 10. A drainage hole 11 is provided at a position corresponding to the lubrication groove 10 on the side wall of the outer sleeve 1. The drainage hole 11 is in fluid communication with the lubrication groove 10. The length of the lubrication groove 10 is 50 mm, and the diameter of the drainage hole 11 is 10 mm.

[0038] like Fig.10As shown, a pressure equalizing groove 9 is opened along the circumferential direction on the side surface where the upper end cover 2 contacts the end of the outer sleeve 1, a part of the pressure equalizing groove 9 is located between the end surface of the upper end cover 2 and the outer sleeve 1, and another part of the pressure equalizing groove 9 is fluidly connected to the outer sleeve 1; another pressure equalizing groove 9 is opened along the circumferential direction on the side surface where the lower end cover 3 contacts the end of the outer sleeve 1, a part of the other pressure equalizing groove 9 is located between the lower end cover 3 and the end surface of the outer sleeve 1, and another part of the other pressure equalizing groove 9 is fluidly connected to the outer sleeve 1; the depth of the pressure equalizing groove 9 is 2 mm and the width is 1.5 mm.

[0039] Working principle of the invention: The main function of the invention is to use the residual pressure of high-pressure brine after the reverse osmosis membrane in the reverse osmosis seawater desalination process to pressurize the seawater raw material, thereby providing pressurized seawater raw material for seawater desalination and realizing pressure energy recovery;

[0040] At work, if Figure 3 , Figure 6 As shown, the high-pressure fluid inlet 21 is connected to the high-pressure wastewater, and the low-pressure fluid inlet 32 ​​is connected to the low-pressure seawater raw material. The specific decomposition steps are as follows:

[0041] Step 1: High-pressure wastewater enters the outer sleeve 1 through the high-pressure fluid inlet 21, and drives the upper impeller 6 to rotate and then enters the first energy conversion channel 8. The upper impeller 6 drives the rotor 4 and the lower impeller 7 to rotate synchronously. The second liquid storage chamber 13 on the lower impeller 7 filled with wastewater, the first energy conversion channel 8 and the first liquid storage chamber 12 of the upper impeller 6 rotate at a certain angle, and staggered at a certain angle with the high-pressure fluid inlet 21 and the high-pressure fluid outlet 31. At this time, the first liquid storage chamber 12 and the inner wall surface of the upper end cover 2 and the inner wall surface of the outer sleeve 1 are surrounded to form a closed space a1, and the second liquid storage chamber 13 and the inner wall surface of the lower end cover 3 and the inner wall surface of the outer sleeve 1 are surrounded to form a closed space a2. The two closed spaces a1, a2 and the first energy conversion channel 8 together form a first large closed space A1 for storing waste liquid;

[0042] Step 2: Low-pressure seawater enters from the low-pressure fluid inlet 32 ​​and enters another second liquid storage chamber 13 on the lower impeller 7, then enters the second energy conversion channel 8, and finally enters the first liquid storage chamber 12 in the upper impeller 6. At the same time, when the low-pressure seawater passes through the lower impeller 7, it drives the lower impeller 7 to rotate. The other principles are the same as the above principles, and a second large closed space A2 storing low-pressure seawater is formed;

[0043] Step 3: Liquid energy conversion process: When the large closed space A2 filled with low-pressure seawater rotates to the position of the high-pressure fluid inlet 21, it is connected to the high-pressure fluid inlet 21, and high-pressure wastewater enters through the high-pressure fluid inlet 21 and pushes and squeezes the original low-pressure seawater to be discharged outward through the high-pressure fluid outlet 31, pressurizing the low-pressure seawater, thereby realizing pressure energy recovery. At this time, the low-pressure seawater in the large closed space A2 is replaced by wastewater; as the rotor 4 continues to rotate, the low-pressure seawater enters the energy conversion channel 8 through the low-pressure fluid inlet 32, pushing the wastewater to be discharged from the low-pressure fluid outlet 22.

[0044] The above process is actually run quickly and continuously, and the decomposition is only for the convenience of understanding the operating principle and process.

[0045] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the claims of this patent application.

Claims

1. A self-driven rotary pressure energy recovery device with a built-in guide impeller structure, characterized in that: The invention comprises an outer sleeve (1), an upper end cover (2), a lower end cover (3) and a rotor (4); the rotor (4) is coaxially rotatably mounted in the outer sleeve (1); the rotor (4) and the outer sleeve (1) are clearance-matched; the upper end cover (2) is sealingly connected to one end of the outer sleeve (1); the lower end cover (3) is sealingly connected to the other end of the outer sleeve (1); an upper impeller (6) is coaxially connected to one end of the rotor (4); a lower impeller (7) is coaxially connected to the other end of the rotor (4); the blade ends of the upper impeller (6) and the blade ends of the lower impeller (7) have gaps with the inner wall surface of the sleeve (1); the blades of the upper impeller (6) have gaps with the inner wall surface of the upper end cover (2); and the lower impeller (7) is coaxially connected to the inner wall surface of the sleeve (1). The blades of the impeller (7) and the inner wall of the lower end cover (3) have gaps; a transducing channel (8) is provided in the rotor (4); one end of the transducing channel (8) is connected to the position of the upper impeller (6), and the other end of the transducing channel (8) is connected to the position of the lower impeller (7); the upper end cover (2) is connected to a high-pressure fluid inlet (21) and a low-pressure fluid outlet (22), and the lower end cover (3) is connected to a high-pressure fluid outlet (31) and a low-pressure fluid inlet (32); high-pressure waste liquid enters the outer sleeve (1) through the high-pressure fluid inlet (21) to drive the upper impeller (6) to rotate, and low-pressure seawater enters the outer sleeve (1) through the low-pressure fluid inlet (32) to drive the lower impeller (7) to rotate, and the upper impeller (6) and the lower impeller (7) synchronously drive the rotor (4) to rotate.

2. A self-driven rotary pressure energy recovery device with a built-in guide impeller structure according to claim 1, characterized in that: A first liquid storage chamber (12) is formed between two adjacent blades of the upper impeller (6), and a second liquid storage chamber (13) is formed between two adjacent blades of the lower impeller (7). Both ends of the energy conversion channel (8) are fluidly connected to the first liquid storage chamber (12) and the second liquid storage chamber (13), respectively. When the rotor (4) rotates, one of the first liquid storage chambers (12) is fluidly connected to the high-pressure fluid inlet (21) and the low-pressure fluid outlet (22) in sequence, and one of the second liquid storage chambers (13) is fluidly connected to the high-pressure fluid outlet (31) and the low-pressure fluid inlet (32) in sequence.

3. The self-driven rotary pressure energy recovery device with a built-in guide impeller structure according to claim 2, characterized in that: The energy conversion channel (8) is arranged along the axial direction of the rotor (4) and passes through both ends of the rotor (4); the high-pressure fluid inlet (21) and the high-pressure fluid outlet (31) correspond to each other in the axial direction; and the low-pressure fluid outlet (22) and the low-pressure fluid inlet (32) correspond to each other in the axial direction.

4. The self-driven rotary pressure energy recovery device with a built-in guide impeller structure according to claim 3, characterized in that: More than two energy conversion channels (8) are provided in the rotor (4) at equal intervals along its circumferential direction, and any one of the first liquid storage chambers (12) is fluidically connected to the second liquid storage chamber (13) via at least one energy conversion channel (8).

5. The self-driven rotary pressure energy recovery device with a built-in guide impeller structure according to claim 4, characterized in that: A partition layer (14) is formed between two adjacent energy conversion channels (8); the thickness of the blades of the upper impeller (6) or the lower impeller (7) is equal to the thickness of the partition layer (14); and the blades of the upper impeller (6) or the lower impeller (7) are connected to the partition layer (14).

6. The self-driven rotary pressure energy recovery device with a built-in guide impeller structure according to claim 5, characterized in that: The length of the energy conversion channel (8) is 220 mm, and the lengths of the upper impeller (6) and the lower impeller (7) are 40 mm.

7. A self-driven rotary pressure energy recovery device with a built-in guide impeller structure according to any one of claims 1 to 6, characterized in that: The upper impeller (6) and the lower impeller (7) have the same structure and are arranged in mirror symmetry with respect to a cross section perpendicular to the axis of the rotor (4).

8. The self-driven rotary pressure energy recovery device with a built-in guide impeller structure according to claim 7, characterized in that: The included angle between the blades of the upper impeller (6) and the axis of the rotor (4) is 45 to 80 degrees, and the included angle between the blades of the lower impeller (7) and the axis of the rotor (4) is also 45 to 80 degrees.

9. The self-driven rotary pressure energy recovery device with a built-in guide impeller structure according to claim 7, characterized in that: The inner diameters of the high-pressure fluid inlet (21), the low-pressure fluid outlet (22), the high-pressure fluid outlet (31) and the low-pressure fluid inlet (32) are the same and are all larger than the maximum distance between two adjacent blades of the upper impeller (6) or the lower impeller (7).

10. The self-driven rotary pressure energy recovery device with a built-in guide impeller structure according to claim 1, characterized in that: The gap between the outer circumferential surface of the rotor (4) and the inner circumferential surface of the outer sleeve (1) forms a lubrication gap. A lubrication groove (10) is provided in the middle of the outer circumferential surface of the rotor (4) along its circumferential direction. The lubrication gap is fluidically connected to the lubrication groove (10). A drainage hole (11) is provided through the side wall of the outer sleeve (1) at a position corresponding to the lubrication groove (10). The drainage hole (11) is fluidically connected to the lubrication groove (10). The length of the lubrication groove (10) is 50 mm, and the diameter of the drainage hole (11) is 10 mm. A pressure equalizing groove (9) is provided on the side surface of the upper end cover (2) that contacts the end of the outer sleeve (1) along its circumferential direction. A portion of the pressure equalizing groove (9) is located at the upper end cover (2). and the end surface of the outer sleeve (1), and another part of the pressure equalizing groove (9) is in fluid communication with the outer sleeve (1); another pressure equalizing groove (9) is opened along the circumferential direction of the side surface of the lower end cover (3) in contact with the end of the outer sleeve (1), and a part of the other pressure equalizing groove (9) is located between the lower end cover (3) and the end surface of the outer sleeve (1), and another part of the other pressure equalizing groove (9) is in fluid communication with the outer sleeve (1); the depth of the pressure equalizing groove (9) is 2 mm and the width is 1.5 mm; a central shaft (5) is coaxially fixedly connected inside the rotor (4), one end of the central shaft (5) is rotatably connected to the upper end cover (2), and the other end of the central shaft (5) is rotatably connected to the lower end cover (3).

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