Liquid-ring vacuum pump assembly and liquid-ring vacuum pump

Abstract

A liquid-ring vacuum pump assembly and a liquid-ring vacuum pump. The liquid-ring vacuum pump assembly comprises a motor (100) and a pump body. The motor (100) comprises a rotor (110), and a first end cover (120) located at one end of the motor (100), the rotor (110) extending out of the first end cover (120) and being rotatably supported at the first end cover (120). The pump body comprises a housing (200), and the housing (200) and the first end cover (120) are configured to have an integrated structure. An accommodation cavity (200a) used to accommodate an impeller (210) is formed in the housing (200). An end of the rotor (110) extending out of the first end cover (120) is located in the accommodation cavity (200a), and the rotor (110) is connected to the impeller (210). The housing (200) and the first end cover (120) are configured to be an integrated structure, so that the number of components and assembly steps of the liquid-ring vacuum pump can be reduced.

Description

Liquid ring vacuum pump components and liquid ring vacuum pumps Technical Field

[0001] The present application relates to the field of vacuum pumps, and in particular to a liquid ring vacuum pump assembly and a liquid ring vacuum pump. Background Art

[0002] In the liquid ring vacuum pump of the related art, the motor end cover is separated from the motor housing and the pump body. When assembling the pump body and the motor end cover, it is necessary to tighten the bolts to the pump body from the inside of the motor end cover, and the motor rotor is fixed to the motor end cover. During the assembly of the pump body and the motor end cover, it is necessary to first remove the motor end cover together with the motor rotor from the motor housing, and then use bolts to lock the motor end cover and the pump body to complete the assembly. After that, the motor rotor needs to be restored. The assembly process is complicated and time-consuming. In addition, during the disassembly and restoration of the motor rotor, it is easy to cause damage to the coils inside the motor housing and the bearings of the motor rotor, reducing the service life of the motor.

[0003] Summary of the Invention

[0004] The present application provides a liquid ring vacuum pump assembly and a liquid ring vacuum pump, which can reduce the number of parts and assembly steps of the liquid ring vacuum pump.

[0005] One aspect of the present application provides a liquid ring vacuum pump assembly, comprising: a motor, including a rotor and a first end cover located at one end of the motor, the rotor extending from the first end cover and being rotatably supported on the first end cover; and a pump body, including an outer shell, the outer shell and the first end cover are arranged as an integral structure, the outer shell is formed with a receiving cavity for accommodating an impeller, the end of the rotor extending from the first end cover is located in the receiving cavity, and the rotor is used to be connected to the impeller.

[0006] Optionally, the first end cover is provided with an axial hole, the rotor extends from the axial hole, and a shaft seal surrounding the rotor is installed between the rotor and the first end cover, and the shaft seal is used to seal the receiving cavity.

[0007] Optionally, the first end cover is further provided with a water outlet hole, one end of the water outlet hole is connected to the shaft hole, and the other end passes through the outer surface of the first end cover, and the water outlet hole is located on the side of the shaft seal facing away from the accommodating cavity.

[0008] Optionally, the first end cover is further provided with an air pressure balance hole, one end of the air pressure balance hole is connected to the shaft hole, and the other end passes through the outer surface of the first end cover.

[0009] Optionally, the air pressure balance hole and the water outlet hole extend radially along the first end cover and are arranged perpendicular to each other.

[0010] Optionally, the rotor is rotatably supported on the first end cover through a first bearing, and the liquid ring vacuum pump assembly further comprises two bearing pressure covers installed at both ends of the first bearing along the axial direction of the first end cover, the two bearing pressure covers are fixedly connected to the first end cover and fix the first bearing axially from both ends of the first bearing.

[0011] Optionally, the motor further includes an annular casing surrounding the rotor, and the annular casing is coaxially mounted with the first end cover.

[0012] Optionally, the liquid ring vacuum pump assembly further includes a gap ring, and the rotor, the gap ring and the impeller are sequentially sleeved together from the inside to the outside, the gap ring is interference fitted on the rotor, and fixedly connects the impeller and the rotor in the circumferential direction.

[0013] Optionally, the motor further includes a second end cover located at the other end of the motor and opposite to the first end cover, and the rotor is rotatably supported on the second end cover via a second bearing.

[0014] Optionally, a gap is provided between the second bearing and the second end cover along the axial direction of the rotor, an elastic element is provided in the gap, and an elastic deformation direction of the elastic element is consistent with the axial direction of the rotor.

[0015] Optionally, the elastic element includes a wave spring.

[0016] Another aspect of the present application provides a liquid ring vacuum pump, comprising any of the liquid ring vacuum pump components described above.

[0017] The present application provides a liquid ring vacuum pump assembly and a liquid ring vacuum pump in which the housing and first end cap are configured as an integral structure. This eliminates the need for a separate assembly process, thereby reducing the number of components and assembly steps required for the liquid ring vacuum pump. Furthermore, this avoids damage to the rotor, motor coils, and bearings that support the rotor and end cap when disassembling and reassembling the end cap, thereby increasing the motor's service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] FIG1 is a schematic diagram of a liquid ring vacuum pump in the related art.

[0019] FIG2 is a schematic diagram of a liquid ring vacuum pump assembly according to an exemplary embodiment of the present application.

[0020] FIG3 is a cross-sectional view of a liquid ring vacuum pump according to an exemplary embodiment of the present application. DETAILED DESCRIPTION

[0021] Exemplary embodiments are described in detail herein, with examples illustrated in the accompanying drawings. When the following description refers to the drawings, identical numerals in different figures represent identical or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all embodiments consistent with the present application. Rather, they are merely examples of apparatuses and methods consistent with certain aspects of the present application.

[0022] The terms used in this application are for the purpose of describing specific embodiments only and are not intended to limit this application. Unless otherwise defined, technical or scientific terms used in this application should have the ordinary meanings understood by a person of ordinary skill in the art to which this application belongs. The terms "first," "second," and similar terms used in this application do not denote any order, quantity, or importance, but are simply used to distinguish different components. Similarly, terms such as "a" or "an" do not denote a quantitative limitation, but rather indicate the presence of at least one. If only "a" is referred to, this will be separately stated. "Multiple" or "several" means two or more. Unless otherwise indicated, terms such as "front," "rear," "lower," and / or "upper," "top," and "bottom" are used for convenience of description only and are not limited to a single location or spatial orientation. Terms such as "include" or "comprising" mean that the elements or objects listed before "include" or "comprising" include the elements or objects listed after "include" or "comprising" and their equivalents, and do not exclude other elements or objects. The words “connected” or “connected” and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

[0023] Figure 1 is a liquid ring vacuum pump in the related art. Please refer to Figure 1. The liquid ring vacuum pump in the related art includes a motor end cover 1, a pump body 2 and a motor housing 3, and the three are separable. In the process of assembling the motor end cover 1 and the pump body 2, it is necessary to first remove the motor end cover 1 from the motor housing 3. The motor rotor is connected to the motor end cover 1 through a bearing, so when the motor end cover 1 is removed, the motor rotor will be taken out together, and then the bolts are screwed into the bolt holes inside the motor end cover 1 to assemble the motor end cover 1 and the pump body 2 together. The assembly process is complicated and time-consuming. In addition, during the disassembly and restoration of the motor rotor, due to the instability of manual operation, it is easy to cause damage to the coil inside the motor housing and the bearing of the motor rotor, thereby reducing the service life of the motor.

[0024] In view of this, the present application provides a liquid ring vacuum pump assembly. Referring to Figures 2 and 3, the liquid ring vacuum pump assembly includes a motor 100 and a pump body. The motor 100 includes a rotor 110 and a first end cover 120 located at one end of the motor 100. The rotor 110 extends from the first end cover 120 into the interior of the pump body, and the rotor 110 is rotatably supported on the first end cover 120, for example, by a bearing. The pump body includes a housing 200, and the housing 200 and the first end cover 120 are configured as an integral structure, for example, by casting, 3D printing, or other processes. The housing 200 is formed with a receiving chamber 200a for accommodating an impeller 210, and the end of the rotor 110 extending from the first end cover 120 is located in the receiving chamber 200a. The rotor 110 is used to connect to the impeller 210 to drive the impeller 210 to rotate, so that the impeller 210 operates within the receiving chamber 200a.

[0025] Because the housing 200 and the first end cap 120 are integrally formed, there is no need to assemble the housing 200 and the first end cap 120, which reduces the number of components and assembly steps required for the liquid ring vacuum pump. This also avoids damage to the rotor, motor coils, and bearings that support the rotor and end cap when disassembling and reassembling the end cap, thereby increasing the lifespan of the motor.

[0026] In one embodiment, referring to FIG3 , the first end cap 120 is provided with a shaft hole 130, through which the rotor 110 extends. The shaft hole 130 extends axially along the first end cap 120. A shaft seal 140 is installed between the rotor 110 and the first end cap 120, surrounding the rotor 110. This can be understood as the shaft seal 140 being located within and surrounding the rotor 110. The shaft seal 140 is used to seal the receiving cavity 200a. The shaft seal 140 seals the gap between the rotor 110 and the shaft hole 130, thereby sealing the receiving cavity 200a and preventing liquid within the receiving cavity 200a from flowing back into the shaft hole 130. The first end cap 120 includes a water outlet 150. One end of the water outlet 150 is connected to the shaft hole 130, and the other end extends through the outer surface of the first end cap 120. The water outlet 150 is located on the side of the shaft seal 140 facing away from the receiving cavity 200a. The water outlet 150 is used to discharge the accumulated liquid. The water outlet 150 is located at the lower part of the first end cover 120. When the shaft seal 140 leaks, the liquid (for example, water) inside the receiving chamber 200a will flow back into the shaft hole 130, and the liquid will accumulate in the shaft hole 130. The accumulated liquid can be discharged from the shaft hole 130 through the water outlet 150 under the action of gravity. By providing the water outlet 150, not only can the liquid accumulated in the shaft hole 130 be discharged, thereby preventing the components in the shaft hole 130 from oxidation and rusting, but also when liquid is found to be discharged from the outer surface of the first end cover 120, it can be promptly known that the shaft seal 140 has leaked, and the shaft seal 140 can then be repaired. The shape and extension direction of the water outlet 150 are not limited here.

[0027] In one embodiment, referring to FIG2 , the first end cap 120 further includes an air pressure balancing hole 160, one end of which is connected to the shaft hole 130, and the other end of which extends through the outer surface of the first end cap 120. The air pressure balancing hole 160 and the water outlet hole 150 are located on the same side of the shaft seal 140. The air pressure balancing hole 160 is used to balance the air pressure inside the shaft hole 130 with the atmospheric pressure outside the first end cap 120. Because the air pressure inside the shaft hole 130 may be much lower than the atmospheric pressure outside the first end cap 120, the liquid accumulated in the shaft hole 130 cannot be discharged smoothly through the water outlet hole 150 by its own gravity, making it impossible to observe water leakage from the shaft seal 140 in a timely manner. By providing the air pressure balancing hole 160, the air pressure inside the shaft hole 130 is equal to the atmospheric pressure. At this time, the liquid accumulated in the shaft hole 130 can be discharged smoothly through the water outlet hole 150.

[0028] In one embodiment, the pressure balancing hole 160 and the water outlet hole 150 extend radially along the first end cap 120 and are perpendicular to each other and spaced apart. Compared to a configuration in which the pressure balancing hole 160 and the water outlet hole 150 are positioned adjacent to each other, the perpendicular and spaced-apart configuration of the pressure balancing hole 160 and the water outlet hole 150 can prevent the pressure balancing hole 160 and the water outlet hole 150 from being simultaneously flooded when excessive liquid accumulates within the shaft hole 130, thereby hindering the smooth discharge of the accumulated liquid. It should be noted that the angle between the pressure balancing hole 160 and the water outlet hole 150 can also be greater than 90 degrees, for example, 120 degrees, 180 degrees, etc.

[0029] In one embodiment, the rotor 110 is rotatably supported on the first end cover 120 via a first bearing 111. The liquid ring vacuum pump assembly further includes two bearing glands 111a mounted at both ends of the first bearing 111 along the axial direction of the first end cover 120. The two bearing glands 111a are fixedly connected to the first end cover 120, for example, by bolts, welding, clamping, etc. The two bearing glands 111a axially secure the first bearing 111 from both ends of the first bearing 111. The bearing glands 111a can secure the first bearing 111 axially, controlling the axial movement of the first bearing 111 and the rotor 110 connected to the first bearing 111 to be less than or equal to 0.05 mm.

[0030] In one embodiment, the motor 100 further includes an annular housing 170 surrounding the rotor 110, which can also be understood as the motor's outer shell. The annular housing 170 is coaxially mounted with the first end cap 120. The rotor 110 extends from the annular housing 170 into the first end cap 120 and passes through the first end cap 120. The coaxial mounting of the annular housing 170 and the first end cap 120 allows the rotor 110 to smoothly extend from the annular housing 170 into the first end cap 120, reduces frictional vibration between the rotor 110 and the first end cap 120 during rotation, and also makes the liquid ring vacuum pump more compact.

[0031] In one embodiment, please refer to Figure 3, the liquid ring vacuum pump assembly also includes a gap ring 220, and the rotor 110, the gap ring 220 and the impeller 210 are sequentially arranged together from the inside to the outside. The gap ring 220 is interference-mounted on the rotor 110 and fixedly connects the impeller 210 and the rotor 110 in the circumferential direction. The gap ring 220 is interference-mounted on the rotor 110, which allows the impeller 210 to rotate with the rotor 110. In addition, the interference mounting method has a simple structure, good centering, large load-bearing capacity, little weakening of the strength of the rotor 110 and the impeller 210, and good impact resistance. In addition, the impeller 210 and the rotor 110 can also be fixed together by means of clamping, bolts, etc., which is not limited in this application.

[0032] In one embodiment, referring to FIG3 , the motor 100 further includes a second end cap 180 located at the other end of the motor 100 and opposite the first end cap 120. Here, the first end cap 120 may be the front end cap of the motor 100, and the second end cap 180 may be the rear end cap of the motor 100. The rotor 110 is also rotatably supported on the second end cap 180 via a second bearing 112. A gap is defined between the second bearing 112 and the second end cap 180 along the axial direction of the rotor 110. An elastic element 112a is disposed within the gap, and the elastic deformation direction of the elastic element 112a is aligned with the axial direction of the rotor 110. The elastic element 112a can appropriately preload the second bearing 112. Properly preloading the bearing can extend its life and eliminate vibration and noise caused by specific spacing, manufacturing precision, and wear. The elastic element 112a may be made of an elastic material, a coil spring, a butterfly spring, or the like.

[0033] In one embodiment, the elastic element 112a is a wave spring. The wave spring generates elastic force through the bending moment of the formed corrugations, and the wave spring is light in weight and small in size.

[0034] The present application also provides a liquid ring vacuum pump, which may include the liquid ring vacuum pump assembly described in any of the above embodiments.

[0035] The above descriptions are merely some embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A liquid ring vacuum pump assembly, characterized in that: include: A motor, comprising a rotor and a first end cover located at one end of the motor, wherein the rotor extends from the first end cover and is rotatably supported by the first end cover; and The pump body includes a shell, the shell and the first end cover are set as an integral structure, the shell forms a receiving cavity for accommodating the impeller, the end of the rotor extending from the first end cover is located in the receiving cavity, and the rotor is used to connect with the impeller.

2. The liquid ring vacuum pump assembly according to claim 1, characterized in that: The first end cover is provided with an axial hole, and the rotor extends out of the axial hole. A shaft seal surrounding the rotor is installed between the rotor and the first end cover, and the shaft seal is used to seal the receiving cavity.

3. The liquid ring vacuum pump assembly according to claim 2, characterized in that: The first end cover is also provided with a water outlet hole, one end of which is connected to the shaft hole, and the other end of which passes through the outer surface of the first end cover. The water outlet hole is located on the side of the shaft seal facing away from the accommodating cavity.

4. The liquid ring vacuum pump assembly according to claim 3, characterized in that: The first end cover is also provided with an air pressure balance hole, one end of which is connected to the shaft hole, and the other end of which passes through the outer surface of the first end cover.

5. The liquid ring vacuum pump assembly according to claim 4, characterized in that: The air pressure balance hole and the water outlet hole extend in the radial direction of the first end cover and are arranged perpendicular to each other.

6. The liquid ring vacuum pump assembly according to any one of claims 1 to 5, characterized in that: The rotor is rotatably supported on the first end cover via a first bearing, The liquid ring vacuum pump assembly also includes two bearing glands installed at both ends of the first bearing along the axial direction of the first end cover. The two bearing glands are fixedly connected to the first end cover and fix the first bearing from both ends of the first bearing along the axial direction.

7. The liquid ring vacuum pump assembly according to any one of claims 1 to 6, characterized in that: The motor further includes an annular housing surrounding the rotor, wherein the annular housing is coaxially mounted with the first end cover.

8. The liquid ring vacuum pump assembly according to any one of claims 1 to 7, further comprising a gap ring, The rotor, the gap ring and the impeller are sequentially sleeved together from the inside to the outside. The clearance ring is interference-fitted to the rotor and fixedly connects the impeller and the rotor in the circumferential direction.

9. The liquid ring vacuum pump assembly according to any one of claims 1 to 8, characterized in that: The motor further comprises a second end cover located at the other end of the motor and opposite to the first end cover, The rotor is rotatably supported on the second end cover via a second bearing.

10. The liquid ring vacuum pump assembly according to claim 9, characterized in that: Along the axial direction of the rotor, a gap is provided between the second bearing and the second end cover. An elastic element is arranged in the gap, and the elastic deformation direction of the elastic element is consistent with the axial direction of the rotor.

11. The liquid ring vacuum pump assembly according to claim 10, characterized in that: The elastic element includes a wave spring.

12. A liquid ring vacuum pump, characterized in that: A liquid ring vacuum pump assembly comprising any one of claims 1 to 11.

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