CN210949136U

CN210949136U - Multistage screw compressor

Info

Publication number: CN210949136U
Application number: CN201921228362.0U
Authority: CN
Inventors: 蒋豪; 胡凌
Original assignee: Ningbo Baosi Energy Equipment Co Ltd
Current assignee: Ningbo Baosi Energy Equipment Co Ltd
Priority date: 2019-07-31
Filing date: 2019-07-31
Publication date: 2020-07-07
Anticipated expiration: 2029-07-31

Abstract

The utility model discloses a multistage screw compressor, which comprises a shell and a multistage rotor set; the rotor sets comprise a male rotor and a female rotor which are matched with each other, and the rotor sets of two adjacent stages are driven by gears; both ends of the male rotor and both ends of the female rotor are arranged in the shell through bearings; the row ends of the male rotor and the female rotor are locked with the corresponding bearings through fasteners; and a male adjusting gasket is arranged between the male rotor and the corresponding inner end surface of the bearing or between the end surface of the male rotor and the fastener, and a female adjusting gasket is arranged between the female rotor and the corresponding inner end surface of the bearing or between the bearing and the fastener. The multistage screw compressor has the advantages of simple structure for adjusting the clearance and convenience for adjusting the exhaust clearance.

Description

Multistage screw compressor

Technical Field

The utility model relates to a compressor technical field, more precisely relate to a multistage screw compressor.

Background

Along with the improvement of the compression capacity of the compressor, the multistage screw compressor is more and more widely applied, and is more suitable for places with lower evaporation temperature and large cold quantity demand, such as freezing and refrigeration, low-temperature environment laboratories and the like.

The multistage screw compressor includes at least two-stage rotor sets, i.e., a low-pressure stage rotor set and a high-pressure stage rotor set. And the low-pressure stage rotor set and the high-pressure stage rotor set are in transmission through a gear. The multistage screw compressor has the advantages of simple structure, convenience in processing, lower cost and the like. The adjustment of the exhaust gap of the screw compressor is a key technology, and therefore, a gap adjusting structure is arranged between the rotor and the exhaust mechanism. The working performance of the compressor is directly influenced by adjusting the size of the clearance, and the working efficiency of the compressor is reduced due to overlarge clearance, so that the gas output is insufficient, the power cannot be reached, and the machine is over-heated and automatically stopped; the clearance is too small, even if the axial pump runs normally temporarily and runs for a long time, the end face of the rotor is easy to rub against the exhaust end cover after the axial pump is worn, and the main machine is damaged. Therefore, whether the gap adjusting structure is designed reasonably or not is crucial to the screw compressor. Therefore, the multi-stage screw compressor is a novel compressor, and the gap adjusting structure thereof becomes a key point for developing the product thereof.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to provide a multistage screw compressor, this multistage screw compressor's clearance adjustment simple structure, it is more convenient to adjust exhaust clearance.

The technical solution of the utility model is to provide a multistage screw compressor with the following structure, which comprises a shell and a multistage rotor set; the rotor sets comprise a male rotor and a female rotor which are matched with each other, and the rotor sets of two adjacent stages are driven by gears; both ends of the male rotor and both ends of the female rotor are arranged in the shell through bearings; the row ends of the male rotor and the female rotor are locked with the corresponding bearings through fasteners; and a male adjusting gasket is arranged between the male rotor and the corresponding inner end surface of the bearing or between the end surface of the male rotor and the fastener, and a female adjusting gasket is arranged between the female rotor and the corresponding inner end surface of the bearing or between the bearing and the fastener.

After the structure more than adopting, the utility model discloses a multistage helical-lobe compressor compares with prior art, has following advantage:

because the utility model discloses a multistage helical-lobe compressor's positive rotor and corresponding bearing inner end face between or the terminal surface of positive rotor and the fastener between be equipped with positive adjusting shim, be equipped with negative adjusting shim between negative rotor and corresponding bearing inner end face or the bearing and the fastener between; the gap of the male rotor row end or the gap of the female rotor row end can be adjusted only by replacing the male adjusting gaskets or the female adjusting gaskets with different thicknesses, the structure is simple, and the adjustment is convenient.

As an improvement, the row end of the female rotor is exposed outside the corresponding bearing and is locked by a locking nut; and the female adjusting gasket is arranged between the shaft shoulder at the row end of the female rotor and the inner end surface of the bearing.

As an improvement, the row end of the female rotor is exposed outside the corresponding bearing and is locked by a locking nut; and a female adjusting gasket is arranged between the outer end surface of the bearing and the locking nut.

As an improvement, the end part of the male rotor is exposed outside the corresponding bearing, the end part is externally connected with a gear, a pressing block used for limiting the gear is arranged outside the gear, and the pressing block is connected with the end part of the male rotor through a screw.

As an improvement, a male adjusting gasket is arranged between a shaft shoulder at the row end of the male rotor and the inner end surface of the bearing.

As an improvement, a space is reserved between the end face of the row end of the male rotor and the pressing block, and the male adjusting gasket is arranged in the space.

As an improvement, the bearings are all conical bearings.

As a modification, the number of the rotor sets is two.

As an improvement, the shell comprises a primary shell, a middle shell and a secondary shell; the middle shell is fixedly connected between the primary shell and the secondary shell; the primary rotor group is arranged in the primary shell; the middle shell is internally provided with an exhaust bearing seat, the bearing is arranged in the corresponding exhaust bearing seat, the gear is also arranged in the middle shell, and the secondary rotor group is arranged in the secondary shell.

Drawings

Fig. 1 is a schematic perspective view of the multistage screw compressor of the present invention.

Fig. 2 is a schematic sectional view in the direction of a-a in fig. 1.

Fig. 3 is a schematic view of the internal structure of the middle casing of the multistage screw compressor of the present invention.

Fig. 4 is a schematic view of an assembly structure of the row end of the high-pressure stage female rotor of the multistage screw compressor of the present invention.

Fig. 5 is a schematic assembly diagram of another embodiment of the row end of the high-pressure stage female rotor of the multistage screw compressor according to the present invention.

Fig. 6 is a schematic view of an assembly structure of the row end of the high-pressure stage male rotor of the multistage screw compressor of the present invention.

Shown in the figure: 1. the high-pressure-stage air conditioner comprises a high-pressure-stage shell, a middle shell, a low-pressure-stage shell, a high-pressure-stage male air inlet bearing seat, a high-pressure-stage female air inlet bearing seat, a high-pressure-stage male air outlet bearing seat, a high-pressure-stage female air outlet bearing seat, a high-pressure-stage male rotor, a high-pressure-stage female air inlet bearing seat, a high-pressure-stage male air outlet bearing seat, a high-pressure-stage female air outlet bearing seat, a high-pressure-stage male rotor.

Detailed Description

For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that the detailed description is merely illustrative of exemplary embodiments of the present application and does not limit the scope of the present application in any way. Like reference numerals refer to like elements throughout the specification.

In the drawings, the thickness, size, and shape of an object have been slightly exaggerated for convenience of explanation. The figures are purely diagrammatic and not drawn to scale.

It will be further understood that the terms "comprises," "comprising," "includes," "including," "has," "having," "contains," "including," and/or "containing," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. Further, when a statement such as "… at least one" appears after the list of listed features, the entire listed feature is modified rather than modifying individual elements in the list.

The utility model discloses a multistage helical-lobe compressor includes casing and multistage rotor group.

The rotor set comprises a male rotor and a female rotor which are matched with each other. In this embodiment, the rotor sets include two sets, which are a high-pressure-stage rotor set and a low-pressure-stage rotor set.

The shell comprises a high-pressure shell 1, a middle shell 2 and a low-pressure shell 3. The middle shell 2 is fixedly connected between the high-pressure shell 1 and the low-pressure shell 2. The end part of the high-pressure-stage shell 1, which is far away from the middle shell 2, is internally provided with a high-pressure-stage positive air inlet bearing seat 4 and a high-pressure-stage negative air inlet bearing seat 5, the middle shell 2 is internally provided with a high-pressure-stage positive air outlet bearing seat 4 and a high-pressure-stage negative air outlet bearing seat 5, the end part of the low-pressure-stage shell 3, which is near to the middle shell 2, is internally provided with a low-pressure-stage positive air inlet bearing seat and a low-pressure-stage negative air inlet bearing seat, and the other end of the low-pressure-stage shell is provided with a low-pressure.

The high-pressure stage rotor set comprises a high-pressure stage male rotor 8 and a high-pressure stage female rotor 9, wherein the air inlet end and the air outlet end of the high-pressure stage male rotor 8 are respectively installed in the high-pressure stage male air inlet bearing seat 4 and the high-pressure stage male air outlet bearing seat 6 through conical bearings. And the air inlet end and the air outlet end of the high-pressure-stage female rotor 9 are respectively installed in the high-pressure-stage female air inlet bearing seat 5 and the high-pressure-stage female air outlet bearing seat 7 through conical bearings.

The row end of the high-pressure stage female rotor 9 is exposed out of the corresponding bearing and is locked by a locking nut 10, namely, the outer surface of the part of the row end of the high-pressure stage female rotor 9 exposed out of the high-pressure stage female exhaust bearing seat 6 is provided with an external thread, and the locking nut 10 is screwed on the external thread to limit the high-pressure stage female rotor 9. And a female adjusting gasket 11 is arranged between the shaft shoulder at the row end of the high-pressure female rotor 9 and the corresponding inner end surface of the bearing. In another embodiment of the female adjustment washer 11, the female adjustment washer 11 is disposed between the outer end surface of the bearing and the lock nut 10.

The row end of the high-pressure stage male rotor 8 is exposed outside the corresponding bearing, a first gear 12 is arranged outside the row end, and the first gear 12 and the row end can be in threaded connection or tight fit. The end surface of the row end of the high-pressure stage male rotor 8 is accommodated in the inner ring of the first gear 12. A pressing block 13 is arranged on the outer side of the first gear 12, and the middle part of the pressing block 13 is fixedly connected with the end face of the row end of the high-pressure stage male rotor 8 through a screw. A space 15 is reserved between the end surface of the row end of the high-pressure stage male rotor 8 and the pressing block 13, and a male adjusting gasket 16 is arranged in the space 15. In another embodiment of the male adjustment gasket 16, the male adjustment gasket 16 is arranged between a shaft shoulder at the row end of the high-pressure stage male rotor 8 and the inner end surface of the corresponding bearing.

The low-pressure stage rotor set comprises a low-pressure stage male rotor 17 and a low-pressure stage female rotor 18, wherein the air inlet end and the air outlet end of the low-pressure stage male rotor 17 are respectively installed in the low-pressure stage male air inlet bearing seat and the low-pressure stage male air outlet bearing seat through bearings. The air inlet end and the air outlet end of the low-pressure stage female rotor 17 are respectively installed in the low-pressure stage female air inlet bearing seat and the low-pressure stage female air outlet bearing seat through bearings. The air inlet end of the low-pressure stage male rotor 17 is externally connected with a second gear 19, and the second gear 19 and the air inlet end can be in threaded connection or tight fit. The first gear 12 is meshed with the second gear 19.

Adjusting the clearance a between the high-pressure stage female rotor 9 and the high-pressure stage female exhaust bearing seat 6; according to the length d of the high-pressure stage female rotor 9, the thickness e of the female adjusting gasket 11, the length b of the high-pressure stage female exhaust bearing seat 7 and the height difference c of the inner ring and the outer ring of the corresponding conical bearing A3 measured by a precision instrument, a + b + c is d + e, and then the clearance a is d + e-b-c. During installation and assembly, the thickness e of the female adjusting gasket 11 can be obtained according to an equation, the high-pressure female rotor 9 and the high-pressure female exhaust bearing seat 7 are assembled, the female adjusting gasket 11 is installed in a corresponding shaft section of the high-pressure female rotor 9, the outer ring of the conical bearing A3 is knocked into the high-pressure female exhaust bearing seat 7, the inner ring and the rolling body of the conical bearing A3 are heated and sleeved into the corresponding shaft section of the high-pressure female rotor 9, and finally the locking nut 10 is installed. Alternatively, a female adjustment shim 11 is mounted between the conical bearing a3 and the lock nut 10 to provide the same clearance adjustment.

Adjusting the clearance f between the high-pressure stage male rotor 8 and the high-pressure stage male exhaust bearing seat 6; the high pressure stage male rotor 8, the high pressure stage male exhaust bearing housing 6, and the corresponding conical bearing B7, the first gear 12 may be installed first. The surface between the high-pressure stage male rotor 8 and the high-pressure stage male exhaust bearing seat 6 is attached by a pressing block 13 and a screw lock 10, a screw 14 is unscrewed, and the gap g between the end surface of the high-pressure stage male rotor 7 and the first gear 12 is measured, so that g + f is h + k, and then the gap f is h + k-g. The thickness h of the positive adjustment shim 11 is known from f. Then, the male adjustment washer 11, the pressing block 13 and the screw 14 are installed.

Claims

1. A multistage screw compressor comprises a shell and a multistage rotor set; the rotor sets comprise a male rotor and a female rotor which are matched with each other, and the rotor sets of two adjacent stages are driven by gears; both ends of the male rotor and both ends of the female rotor are arranged in the shell through bearings; the method is characterized in that: the row ends of the male rotor and the female rotor are locked with the corresponding bearings through fasteners; and a male adjusting gasket is arranged between the male rotor and the corresponding inner end surface of the bearing or between the end surface of the male rotor and the fastener, and a female adjusting gasket is arranged between the female rotor and the corresponding inner end surface of the bearing or between the bearing and the fastener.

2. The multi-stage screw compressor of claim 1, wherein: the row end of the female rotor is exposed outside the corresponding bearing and is locked by a locking nut; and the female adjusting gasket is arranged between the shaft shoulder at the row end of the female rotor and the inner end surface of the bearing.

3. The multi-stage screw compressor of claim 1, wherein: the row end of the female rotor is exposed outside the corresponding bearing and is locked by a locking nut; and a female adjusting gasket is arranged between the outer end surface of the bearing and the locking nut.

4. The multi-stage screw compressor of claim 1, wherein: the end part of the male rotor is exposed outside the corresponding bearing, a gear is connected outside the end part, a pressing block used for limiting the gear is arranged outside the gear, and the pressing block is connected with the end part of the male rotor through a screw.

5. The multi-stage screw compressor of claim 4, wherein: and a male adjusting gasket is arranged between the shaft shoulder of the male rotor row end and the inner end surface of the bearing.

6. The multi-stage screw compressor of claim 4, wherein: a space is reserved between the end face of the row end of the male rotor and the pressing block, and the male adjusting gasket is arranged in the space.

7. The multi-stage screw compressor of claim 1, wherein: the bearings are all conical bearings.

8. The multi-stage screw compressor of claim 1, wherein: the number of the rotor groups is two.

9. The multi-stage screw compressor of claim 8, wherein: the shell comprises a high-pressure shell, a middle shell and a low-pressure shell; the middle shell is fixedly connected between the high-pressure-stage shell and the low-pressure-stage shell; the high-pressure stage rotor group is arranged in the high-pressure stage shell; the middle shell is internally provided with an exhaust bearing seat, the bearing is arranged in the corresponding exhaust bearing seat, the gear is also arranged in the middle shell, and the low-pressure-stage rotor group is arranged in the low-pressure-stage shell.