Two-stage water-ring compressor

Abstract

The utility model relates to the technical field of compressors, in particular to a two-stage water ring compressor which comprises a pump shaft, a first-stage pump cavity is formed in a front pump body in a penetrating mode, the first-stage pump cavity is vertically eccentric relative to the pump shaft, and a front impeller is fixedly installed on the outer side of the pump shaft; a rear pump body is arranged on the side, close to the second front flow guide disc, of the second rear flow guide disc, a second-stage pump cavity is formed in the rear pump body in a penetrating mode, the second-stage pump cavity is eccentric left and right relative to the pump shaft, and a rear impeller is fixedly installed on the outer side of the pump shaft. The two-stage structure design is adopted, external air can be compressed on the inner side of the first-stage pump cavity, the compressed air penetrates through the air hole formed in the middle of the rear impeller under the action of negative pressure to enter the inner side of the second-stage pump cavity, and secondary compression is conducted in the second-stage pump cavity; the air compression ratio of the air inlet end to the air outlet end can reach 1: 7, and the exhaust pressure and the compression efficiency are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, in particular to a two-stage water ring compressor. Background Art

[0002] A water ring compressor is a mechanical device that uses a water ring as a seal and compresses the gas medium. It is widely used in the fields of vacuum and compressed gas. Its working principle is based on the characteristics of water as an annular seal. The main components include a rotor, a stator, and an annular seal formed by water. When working, the rotor rotates inside the stator, and water forms a closed water ring through the gap between the rotor and the stator. When the rotor rotates, the water ring gradually closes certain air cavities, and gas is sucked in from the inlet. As the rotor continues to rotate, the air cavity gradually becomes smaller and the gas is compressed. The role of the water ring is to continuously close the gas cavity and compress it, and finally the compressed gas is discharged through the exhaust port.

[0003] The stator is usually an outer shell or body, in the shape of a ring, with grooves on the inner surface that cooperate with the rotor to guide water and gas. The rotor is installed inside the stator, usually eccentrically. The rotor forms air cavities of different sizes through contact with the stator, thereby completing the gas compression process. The water ring is formed by the gap between the rotor and the stator. The water ring not only serves as a seal for gas compression, but also reduces the gas temperature through cooling to prevent overheating.

[0004] Chinese patent publication number CN106150980B discloses an air compressor comprising a base, a main engine mounted on the base, and a cooler system. The invention uses water cooling to cool the cylinder, ensuring that the oil-free ring operates at a nearly constant temperature. Unlike large oil-free compressors that employ an open isolation chamber between the cylinder and the crosshead, the closed balancing chamber structure of this compressor is simpler and more compact.

[0005] The Chinese patent with announcement number CN112177950B discloses a circulating centrifugal gas compressor, including a gas compressor housing, a waterproof fixed base and a hollow telescopic housing. The invention is provided with a vacuum chamber, which is used in conjunction with a vacuum pump to pre-evacuate before use to ensure the purity of the compressed gas. The multi-cavity filter box is combined with a lifting top plate to filter different gases during compression to meet more usage requirements. At the same time, the setting of the hollow telescopic housing is driven by water pressure to achieve lifting and lowering, which has a better noise reduction effect.

[0006] The liquid ring compressors in the existing market are usually directly modified from the water ring vacuum pump structure. However, due to the differences in their working principles and application scenarios, the main task of the water ring vacuum pump is to extract gas and maintain a certain vacuum state. Usually, the design focuses more on low-pressure, large-flow gas processing, while the function of the liquid ring compressor is to compress the gas to a high-pressure state, which requires the equipment to be able to work efficiently under higher pressure. Therefore, the design of the water ring vacuum pump is not completely suitable for compression applications. The modified liquid ring compressor has design defects, resulting in low efficiency. In addition, the existing liquid ring compressor is limited by the eccentric structure, which not only leads to low compressed gas pressure and large vibration amplitude, but also increases energy consumption and reduces efficiency.

[0007] Therefore, the present invention provides a two-stage water ring compressor capable of performing secondary compression and having a stable structure. Summary of the Invention

[0008] Aiming at the problems of low compression efficiency and unstable structure of liquid ring compressors in the prior art, a two-stage water ring compressor is designed.

[0009] The technical solution adopted by the present invention to solve its technical problem is: a two-stage water ring compressor, including a pump shaft, a front guide plate 2 is rotatably mounted on the outer side of the pump shaft through a bearing, an air inlet 1 is penetrated inside the front guide plate 2, a rear guide plate 2 is rotatably mounted on the outer side of the pump shaft through a bearing, two exhaust ports are penetrated inside the rear guide plate 2 in a centrally symmetrical manner, a front pump body is provided on the side of the front guide plate 2 close to the rear guide plate 2, a circular first-stage pump cavity is penetrated inside the front pump body, and the first-stage pump cavity is up and down relative to the pump shaft, a front impeller is fixedly mounted on the outer side of the pump shaft, and the front impeller is located on the inner side of the first-stage pump cavity, a rear pump body is provided on the side of the rear guide plate 2 close to the front guide plate 2, a secondary pump cavity is penetrated inside the rear pump body, and the secondary pump cavity is eccentric to the left and right relative to the pump shaft, a rear impeller is fixedly mounted on the outer side of the pump shaft, and the rear impeller is located on the inner side of the secondary pump cavity, and a plurality of air holes are provided inside the rear impeller near the pump shaft.

[0010] Furthermore, one end of the pump shaft is rotatably mounted with a rear bearing cover, the outer side of the pump shaft is rotatably mounted with a rear bearing bracket, and the rear bearing bracket is fixedly connected to the rear bearing cover by bolts, and the outside of the other end of the pump shaft is rotatably mounted with a front bearing bracket, the outside of the pump shaft is rotatably mounted with a front bearing cover, the front bearing cover is located on the side of the front bearing bracket away from the rear bearing bracket, and the front bearing cover is fixedly connected to the front bearing bracket by bolts.

[0011] Furthermore, a front end cover is rotatably mounted on the outside of the pump shaft through a bearing, and the front end cover is located on a side of the front bearing bracket away from the front bearing cover, an air inlet end is fixedly mounted on the top of the front end cover, and the air inlet end is communicated with the inner side of the front end cover, a rear end cover is rotatably mounted on the outside of the pump shaft through a bearing, and the rear end cover is located on a side of the rear bearing bracket away from the rear bearing cover, an air outlet end is fixedly mounted on the top of the rear end cover, and the air outlet end is communicated with the inner side of the rear end cover, and a water inlet is provided through the interior of the front end cover and the rear end cover.

[0012] Furthermore, the front deflector plate 2 and the rear deflector plate 2 are both located between the front end cover and the rear end cover, and the side where the front end cover and the front deflector plate 2 are close to each other is provided with raised ribs for diverting function, and the side where the rear end cover and the rear deflector plate 2 are close to each other is provided with raised ribs for diverting function, the side of the front deflector plate 2 away from the front end cover is a smooth plane, and the side of the rear deflector plate 2 away from the rear end cover is a smooth plane.

[0013] Furthermore, the front pump body and the rear pump body are both located between the front guide plate 2 and the rear guide plate 2, and a plurality of liquid flow channels are opened through the interior of the front pump body.

[0014] Furthermore, a front transition plate and a rear transition plate are rotatably mounted on the outer side of the pump shaft through bearings, and the front transition plate and the rear transition plate are both located between the front pump body and the rear pump body, and the front transition plate is in close contact with the front pump body, and the side of the front transition plate close to the front pump body is a smooth plane, and the rear transition plate is in close contact with the rear pump body, and the side of the rear transition plate close to the rear pump body is a smooth plane, and the interior of the front transition plate is provided with an air inlet two, and the interior of the rear transition plate is symmetrically provided with two air inlet threes.

[0015] Furthermore, the front end cover and the rear end cover are connected through multiple screws, both ends of the screws are provided with threads, and the screws are squeezed and fixed with two nuts to the front end cover, the front guide plate 2, the front pump body, the front transition plate, the rear transition plate, the rear pump body, the rear guide plate 2 and the rear end cover.

[0016] Furthermore, the front end cover cooperates with the second front guide plate to form an air intake cavity, and the rear end cover cooperates with the second rear guide plate to form an exhaust cavity.

[0017] Furthermore, the front transition plate and the rear transition plate cooperate to form a transition cavity.

[0018] Beneficial effects of the present invention:

[0019] (1) The two-stage water ring compressor described in the present invention adopts a two-stage structural design, so that the external air can be compressed inside the first pump chamber. Under the action of negative pressure, the compressed air passes through the air hole opened in the middle of the rear impeller and enters the inner side of the second pump chamber, and is compressed twice in the second pump chamber, which can make the air compression ratio between the air inlet and the air outlet reach 1:7, thereby improving the exhaust pressure and compression efficiency.

[0020] (2) The two-stage water ring compressor described in the present invention adopts an upper and lower eccentric structure design of the front pump body and a left and right eccentric structure design of the rear pump body, so that the pump shaft is always located at the center line position of the compressor, and the rotating front impeller and rear impeller are fixed at the center position of the pump shaft, thereby improving the stability of the compressor during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below with reference to the accompanying drawings and examples.

[0022] Figure 1 Schematic diagram of the three-dimensional structure of the compressor body of the present invention;

[0023] Figure 2 This is a schematic diagram of the three-dimensional structure of the front bearing bracket after being disassembled;

[0024] Figure 3 This is a schematic diagram of the three-dimensional structure of the front deflector of the present invention after being disassembled;

[0025] Figure 4 This is a schematic diagram of the three-dimensional structure of the front deflector of the present invention after being split into two parts;

[0026] Figure 5 This is a schematic diagram of the three-dimensional structure of the front pump body of the present invention after being disassembled;

[0027] Figure 6 This is a schematic diagram of the three-dimensional structure of the front transition plate of the present invention after being disassembled;

[0028] Figure 7 It is a schematic side sectional perspective structural diagram of the compressor of the present invention;

[0029] Figure 8 It is a schematic diagram of the top cross-sectional three-dimensional structure of the compressor of the present invention;

[0030] Figure 9 It is a schematic diagram of the back structure of the front transition plate and the front pump body of the present invention;

[0031] Figure 10 It is a front structural schematic diagram of the rear transition plate and the rear pump body of the present invention.

[0032] In the figure: 1. Pump shaft; 2. Rear bearing cover; 3. Rear bearing bracket; 4. Front bearing bracket; 5. Front bearing cover; 6. Front cover; 601. Air inlet; 7. Rear cover; 701. Air outlet; 8. Screw; 9. Front guide plate 2; 10. Air inlet 1; 11. Rear guide plate 2; 12. Exhaust port; 13. Front pump body; 14. Primary pump cavity; 15. Front impeller; 16. Rear pump body; 17. Secondary pump cavity; 18. Rear impeller; 19. Air hole; 20. Front transition plate; 21. Air inlet 2; 22. Rear transition plate; 23. Air inlet 3; 24. Water inlet; 25. Air inlet cavity; 26. Exhaust cavity; 27. Transition cavity. DETAILED DESCRIPTION

[0033] In order to make the technical means, technical features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0034] Example: Figures 1-10 As shown, a two-stage water ring compressor described in the present invention includes a pump shaft 1, one end of the pump shaft 1 is rotatably mounted with a rear bearing cover 2 through a bearing, the outer side of the pump shaft 1 is rotatably mounted with a rear bearing bracket 3 through a bearing, and the rear bearing bracket 3 is fixedly connected to the rear bearing cover 2 through bolts, the outside of the other end of the pump shaft 1 is rotatably mounted with a front bearing bracket 4 through a bearing, the outside of the pump shaft 1 is rotatably mounted with a front bearing cover 5 through a bearing, the front bearing cover 5 is located on the side of the front bearing bracket 4 away from the rear bearing bracket 3, and the front bearing cover 5 is fixedly connected to the front bearing bracket 4 through bolts.

[0035] Specifically, the front bearing bracket 4 and the rear bearing bracket 3 can provide rotational support for the pump shaft 1 through the bearings, and can provide sealing for both ends of the compressor. The front bearing cover 5 and the rear bearing cover 2 can provide dustproof effect for both ends of the compressor, preventing dust from entering the inner side of the front bearing bracket 4 and the rear bearing bracket 3 and affecting the rotation of the pump shaft 1. The rear bearing cover 2 and the rear bearing bracket 3 completely cover one end of the pump shaft 1 to prevent one end of the pump shaft 1 from being exposed to the outside world when the compressor is working, and also protect one end of the pump shaft 1.

[0036] In this embodiment, a front end cover 6 is rotatably mounted on the outside of the pump shaft 1 through a bearing, and the front end cover 6 is located on the side of the front bearing bracket 4 away from the front bearing cover 5, an air inlet end 601 is fixedly mounted on the top of the front end cover 6, and the air inlet end 601 is communicated with the inner side of the front end cover 6, a rear end cover 7 is rotatably mounted on the outside of the pump shaft 1 through a bearing, and the rear end cover 7 is located on the side of the rear bearing bracket 3 away from the rear bearing cover 2, an air outlet end 701 is fixedly mounted on the top of the rear end cover 7, and the air outlet end 701 is communicated with the inner side of the rear end cover 7, and a water inlet 24 is provided through the interior of the front end cover 6 and the rear end cover 7.

[0037] Specifically, the front end cover 6 and the rear end cover 7 can provide fixed support for the compressor, and the compressor can be fixed at a designated working location by passing bolts through the interior of the front end cover 6 and the rear end cover 7. The front end cover 6 can provide stable support for the air inlet end 601, and the air inlet end 601 can provide an air circulation channel for air to enter the inner side of the compressor, so that the outside air can enter the inner side of the compressor through the air inlet end 601. The rear end cover 7 can provide stable support for the air outlet end 701, and the air outlet end 701 can provide an air circulation channel for the compressed air inside the compressor to be discharged to the outside, so that the air inside the compressor can be discharged to the outside through the air outlet end 701. The front end cover 6 and the rear end cover 7 can provide a through-opening space for the water inlet 24, and the water inlet 24 can provide a channel for the external liquid to enter the inside of the compressor.

[0038] In this embodiment, a front guide disc 29 is rotatably mounted on the outer side of the pump shaft 1 through a bearing arrangement, and an air inlet 10 is provided inside the front guide disc 29. A rear guide disc 21 is rotatably mounted on the outer side of the pump shaft 1 through a bearing arrangement, and two exhaust ports 12 are provided inside the rear guide disc 21 in a centrally symmetrical manner. The front guide disc 29 and the rear guide disc 21 are both located between the front end cover 6 and the rear end cover 7, and the side where the front end cover 6 and the front guide disc 29 are close to each other are provided with raised ribs for diverting function, and the side where the rear end cover 7 and the rear guide disc 211 are close to each other are provided with raised ribs for diverting function. The side of the front guide disc 29 away from the front end cover 6 is a smooth plane, and the side of the rear guide disc 211 away from the rear end cover 7 is a smooth plane. The front end cover 6 and the front guide disc 21 cooperate to form an air inlet chamber 25, and the rear end cover 7 and the rear guide disc 211 cooperate to form an exhaust chamber 26.

[0039] Specifically, the front deflector plate 29 can provide a through-opening space for the air inlet 10, the rear deflector plate 21 can provide a through-opening space for the exhaust port 12, the front cover 6 and the front deflector plate 21 form an air inlet cavity 25 that can provide a flow channel for the air, and the rear cover 7 and the rear deflector plate 21 form an exhaust cavity 26 that can provide a flow channel for the air, and the raised ribs on the surface of the front cover 6 and the front deflector plate 21 can provide a guiding effect for the air inside the air inlet cavity 25, so that the outside air passes through the air inlet cavity 25. When the end 601 enters the inner side of the air inlet chamber 25, the air inside the air inlet chamber 25 passes through the air inlet port 10 under the guidance of the raised ribs and enters the inner side of the first-stage pump chamber 14 for compression. Similarly, the raised ribs on the surface of the rear end cover 7 and the rear guide plate 2 11 can provide guidance for the air inside the exhaust chamber 26, so that when the air inside the secondary pump chamber 17 enters the exhaust chamber 26 through the exhaust port 12, under the guidance of the raised ribs, the air inside the exhaust chamber 26 passes through the air outlet end 701 and is discharged to the outside.

[0040] In this embodiment, a front pump body 13 is provided on the side of the front guide disc 2 9 near the rear guide disc 2 11, and a circular first-stage pump chamber 14 is opened through the interior of the front pump body 13, and the first-stage pump chamber 14 is up and down relative to the pump shaft 1, and a front impeller 15 is fixedly installed on the outside of the pump shaft 1, and the front impeller 15 is located on the inner side of the first-stage pump chamber 14, and a rear pump body 16 is provided on the side of the rear guide disc 2 11 near the front guide disc 2 9, and a secondary pump chamber 17 is opened through the interior of the rear pump body 16, and the secondary pump chamber 17 is eccentric to the left and right relative to the pump shaft 1, and a rear impeller 18 is fixedly installed on the outside of the pump shaft 1, and the rear impeller 18 is located on the inner side of the secondary pump chamber 17, and a plurality of channels are provided inside the rear impeller 18 near the pump shaft 1, and the front pump body 13 and the rear pump body 16 are both located between the front guide disc 2 9 and the rear guide disc 2 11, and a plurality of liquid flow channels are also opened through the interior of the front pump body 13.

[0041] Specifically, the front pump body 13 can provide a through-opening space for the first-stage pump chamber 14, and the first-stage pump chamber 14 can provide a rotating space for the front impeller 15, and can also provide space for the movement of the water ring and the compression of the air. At the same time, the front pump body 13 can provide a through-opening space for multiple liquid flow channels, and the multiple liquid flow channels are interconnected. When the external liquid enters the inner side of the air inlet chamber 25 through the water inlet 24 and enters the inner side of the liquid flow channel under the guidance of the raised ribs, the pressure inside the liquid flow channel is kept consistent with the pressure inside the first-stage pump chamber 14. Similarly, the rear pump body 16 can provide a through-opening space for the secondary pump chamber 17, and the secondary pump chamber 17 can provide a rotating space for the rear impeller 18. At the same time, the rear pump body 16 can provide a through-opening space for the channel, and the channel can provide a circulation channel for air, so that the compressed air passes through the channel into the inner side of the secondary pump chamber 17, and then the compressed air is compressed for the second time under the action of the rear impeller 18.

[0042] In this embodiment, a front transition plate 20 and a rear transition plate 22 are rotatably mounted on the outer side of the pump shaft 1 through bearings. The front transition plate 20 and the rear transition plate 22 are both located between the front pump body 13 and the rear pump body 16, and the front transition plate 20 is in close contact with the front pump body 13. The front transition plate 20 and the rear transition plate 22 cooperate to form a transition cavity 27. The side of the front transition plate 20 close to the front pump body 13 is a smooth plane, and the rear transition plate 22 is in close contact with the rear pump body 16. The side of the rear transition plate 22 close to the rear pump body 16 is a smooth plane. An air inlet 21 is provided inside the front transition plate 20, and two air inlet 3s 23 are symmetrically provided inside the rear transition plate 22.

[0043] Specifically, the front transition plate 20 and the rear transition plate 22 can provide a space for the transition chamber 27, and the transition chamber 27 can provide a storage cavity for air. The front transition plate 20 can provide a through-opening space for the air inlet 21, so that the exhaust port can provide a flow channel for the air in the primary pump chamber 14 to enter the inner side of the transition chamber 27. The rear transition plate 22 can provide a through-opening space for the air inlet 3 23, and the air inlet 3 23 can provide a flow channel for the compressed gas in the transition chamber 27 to enter the inner side of the secondary pump chamber 17. After the air in the primary pump chamber 14 is compressed, it passes through the air inlet 2 21 under the action of pressure and enters the inner side of the transition chamber 27. Subsequently, the compressed air inside the transition chamber 27 is sucked into the inner side of the secondary pump chamber 17 through the air inlet 3 23 under the action of the negative pressure inside the secondary pump chamber 17.

[0044] In this embodiment, the front end cover 6 and the rear end cover 7 are connected through multiple screws 8, and threads are provided at both ends of the screws 8. The screws 8 are used together with two nuts to squeeze and fix the front end cover 6, the front guide plate 2 9, the front pump body 13, the front transition plate 20, the rear transition plate 22, the rear pump body 16, the rear guide plate 2 11 and the rear end cover 7.

[0045] Specifically, the front end cover 6 and the rear end cover 7 can provide a through space for the screw 8, and the front end cover 6 and the rear end cover 7 are squeezed toward each other by the threaded action of the two nuts and the screw 8, so that the front guide plate 2 9, the front pump body 13, the front transition plate 20, the rear transition plate 22, the rear pump body 16 and the rear guide plate 2 11 are squeezed through the front end cover 6 and the rear end cover 7 to form a seal.

[0046] Working principle: The staff first installs the device in the designated working position by bolts, and then fixes the pump shaft 1 of the device to the output end of the external motor, starts the motor to drive the pump shaft 1 to rotate, so that the pump shaft 1 rotates clockwise under the action of external force, and the pump shaft 1 drives the front impeller 15 and the rear impeller 18 on the outside to rotate together. At the same time, the staff connects the external water pipe to the water inlet 24, and injects an appropriate amount of liquid into the inner side of the primary pump chamber 14 and the secondary pump chamber 17 through the water inlet 24. When the front impeller 15 and the rear impeller 18 rotate, the front impeller 15 and the rear impeller 18 respectively drive the liquid in the primary pump chamber 14 and the secondary pump chamber 17 to rotate, and the liquid in the primary pump chamber 14 and the secondary pump chamber 17 adheres to the inner wall under the action of centrifugal force to form a water ring;

[0047] The front impeller 15 in the first-stage pump chamber 14 contacts the inner wall of the water ring to form a plurality of closed cavities, and since the first-stage pump chamber 14 is an eccentric structure up and down, the formed cavity gradually decreases from bottom to top. Then, as the front impeller 15 rotates, the cavity near the top will gradually increase in the process of gradually rotating downward, forming a negative pressure. When the cavity after the negative pressure contacts and communicates with the exhaust port, the cavity draws air into the air inlet chamber 25 through the air inlet 10, and then the outside air is sucked into the cavity through the air inlet end 601. Then, the cavity gradually rotates upward to compress the air, and the gradually compressed cavity contacts and communicates with the air inlet 21, so that the compressed air in the compressed cavity enters the inner side of the transition chamber 27 through the air inlet 21.

[0048] The secondary cavity is a left-right eccentric structure, that is, the upper and lower inner walls of the secondary cavity are closest to the pump shaft 1, and the left and right inner walls are farthest from the pump shaft 1. The closer the multiple sealed cavities formed by the rotation of the rear impeller 18 are to the pump shaft 1, the smaller the cavity is, and conversely, the farther away from the pump shaft 1, the larger the cavity is. When the rear impeller 18 drives the cavity to rotate and gradually moves away from the pump shaft 1, the cavity gradually increases to form a negative pressure. When the cavity passes through the air inlet three 23, the compressed air in the transition cavity 27 passes through the air inlet three 23 and the air hole 19 and is sucked into the secondary cavity. Subsequently, the compressed air gradually approaches the pump shaft 1 as the cavity approaches the pump shaft 1, so that the compressed air in the cavity is compressed for the second time. The cavity continues to rotate and contacts and communicates with the exhaust port 12, so that the secondary compressed air passes through the exhaust port 12 and enters the inner side of the exhaust cavity 26. Finally, the secondary compressed air inside the exhaust cavity 26 is discharged through the outlet end 701.

[0049] The design of the secondary structure allows the air to be compressed twice in the compressor, which can make the air compression ratio reach 1:7 and improve the compression effect of the compressor.

[0050] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above-described embodiments. The above-described embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A two-stage water ring compressor, comprising a pump shaft (1), characterized in that: The outer side of the pump shaft (1) is provided with a front guide disc (9) for rotation via a bearing, and an air inlet (10) is provided inside the front guide disc (9). The outer side of the pump shaft (1) is provided with a rear guide disc (11) for rotation via a bearing, and two exhaust ports (12) are provided inside the rear guide disc (11) in a centrally symmetrical manner. A front pump body (13) is provided on the side of the front guide disc (9) close to the rear guide disc (11), and a circular first-stage pump cavity (14) is provided inside the front pump body (13), and the first-stage pump cavity (14) is eccentric with respect to the pump shaft (1). The outer side of the pump shaft (1) is fixedly mounted with a front impeller (15), and the front impeller (15) is located inside the primary pump chamber (14). The rear guide disc 2 (11) is provided with a rear pump body (16) on the side close to the front guide disc 2 (9). The interior of the rear pump body (16) is penetrated by a secondary pump chamber (17), and the secondary pump chamber (17) is eccentric to the left and right relative to the pump shaft (1). The outer side of the pump shaft (1) is fixedly mounted with a rear impeller (18), and the rear impeller (18) is located inside the secondary pump chamber (17). A plurality of air holes (19) are provided inside the rear impeller (18) near the pump shaft (1).

2. A two-stage water ring compressor according to claim 1, characterized in that: One end of the pump shaft (1) is rotatably mounted with a rear bearing cover (2) via a bearing, the outer side of the pump shaft (1) is rotatably mounted with a rear bearing bracket (3), and the rear bearing bracket (3) is fixedly connected to the rear bearing cover (2) via bolts, the outer side of the other end of the pump shaft (1) is rotatably mounted with a front bearing bracket (4), the outer side of the pump shaft (1) is rotatably mounted with a front bearing cover (5), the front bearing cover (5) is located on a side of the front bearing bracket (4) away from the rear bearing bracket (3), and the front bearing cover (5) is fixedly connected to the front bearing bracket (4) via bolts.

3. A two-stage water ring compressor according to claim 2, characterized in that: The pump shaft (1) is rotatably mounted with a front end cover (6) on the outside via a bearing, and the front end cover (6) is located on a side of the front bearing bracket (4) away from the front bearing cover (5), an air inlet end (601) is fixedly mounted on the top of the front end cover (6), and the air inlet end (601) is communicated with the inner side of the front end cover (6), a rear end cover (7) is rotatably mounted on the outside of the pump shaft (1), and the rear end cover (7) is located on a side of the rear bearing bracket (3) away from the rear bearing cover (2), an air outlet end (701) is fixedly mounted on the top of the rear end cover (7), and the air outlet end (701) is communicated with the inner side of the rear end cover (7), and a water inlet (24) is provided through the interior of the front end cover (6) and the rear end cover (7).

4. A two-stage water ring compressor according to claim 3, characterized in that: The front deflector plate 2 (9) and the rear deflector plate 2 (11) are both located between the front end cover (6) and the rear end cover (7), and the front end cover (6) and the front deflector plate 2 (9) are both provided with raised ribs for diverting on one side where they are close to each other, and the rear end cover (7) and the rear deflector plate 2 (11) are both provided with raised ribs for diverting on one side where they are close to each other, and the front deflector plate 2 (9) is provided with a smooth plane on one side away from the front end cover (6), and the rear deflector plate 2 (11) is provided with a smooth plane on one side away from the rear end cover (7).

5. A two-stage water ring compressor according to claim 4, characterized in that: The front pump body (13) and the rear pump body (16) are both located between the second front guide plate (9) and the second rear guide plate (11), and a plurality of liquid flow channels are also provided through the interior of the front pump body (13).

6. A two-stage water ring compressor according to claim 5, characterized in that: A front transition plate (20) and a rear transition plate (22) are rotatably mounted on the outer side of the pump shaft (1) via a bearing. The front transition plate (20) and the rear transition plate (22) are both located between the front pump body (13) and the rear pump body (16). The front transition plate (20) is in close contact with the front pump body (13). The side of the front transition plate (20) close to the front pump body (13) is a smooth plane. The rear transition plate (22) is in close contact with the rear pump body (16). The side of the rear transition plate (22) close to the rear pump body (16) is a smooth plane. An air inlet 2 (21) is provided through the interior of the front transition plate (20), and two air inlet 3 (23) are symmetrically provided through the interior of the rear transition plate (22).

7. The two-stage water ring compressor according to claim 5, characterized in that: The front end cover (6) and the rear end cover (7) are connected through a plurality of screw rods (8), both ends of which are provided with threads. The screw rods (8) are used to squeeze and fix the front end cover (6), the second front guide plate (9), the front pump body (13), the front transition plate (20), the rear transition plate (22), the rear pump body (16), the second rear guide plate (11) and the rear end cover (7) together with two nuts.

8. The two-stage water ring compressor according to claim 4, characterized in that: The front end cover (6) cooperates with the second front guide disc (9) to form an air intake cavity (25), and the rear end cover (7) cooperates with the second rear guide disc (11) to form an air exhaust cavity (26).

9. The two-stage water ring compressor according to claim 6, characterized in that: The front transition disc (20) and the rear transition disc (22) cooperate to form a transition cavity (27).

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