CN111043033A

CN111043033A - Screw compressor and air conditioner

Info

Publication number: CN111043033A
Application number: CN202010008013.9A
Authority: CN
Inventors: 武晓昆; 张治平; 龙忠铿; 李磊; 李日华; 毕雨时
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2020-01-06
Filing date: 2020-01-06
Publication date: 2020-04-21
Also published as: WO2021139421A1

Abstract

The invention discloses a screw compressor and an air conditioner. The screw compressor comprises a shell and a rotor assembly, the rotor assembly is rotatably arranged in the shell and comprises a rotating shaft and a first rotor and a second rotor which are sequentially and coaxially arranged on the rotating shaft, the rotating directions of the threads of the first rotor and the second rotor are opposite, the end faces, close to each other, of the first rotor and the second rotor are connected, and an air suction port is formed in the position, corresponding to the joint, of the shell. The two pairs of rotors of the screw compressor are symmetrically arranged, which is equivalent to that two screw compressors are connected in parallel, so that the size of the screw compressor can be greatly reduced under the condition of the same air displacement. In addition, the end faces of the first rotor and the second rotor which are close to each other are jointed, so that the screw compressor sucks air from the joint, and the air respectively flows to the rotors on two sides to be compressed and exhausted, and the whole screw compressor is more compact in structure.

Description

Screw compressor and air conditioner

Technical Field

The invention relates to the technical field of compressors, in particular to a screw compressor and an air conditioner.

Background

Typically, screw compressors are provided with a pair of parallel screw rotors which form a volume of space with the inner shell wall. The volume increases and decreases periodically during rotation of the rotor. Through reasonable design, the volume is periodically communicated with and closed by the air inlet and the air outlet, so that the whole process of air suction, compression and air exhaust can be completed. At present, the double-screw compressor is widely applied to refrigeration air conditioners in a medium cooling capacity range.

In certain applications, such as when basement-mounted equipment requires compressor replacement, only a smaller compressor is allowed to enter due to the size constraints of the location. Since the size of the compressor is determined by the amount of the discharged air, the discharge amount becomes smaller and cannot meet the user's demand if the compressor with a smaller size is selected. It is therefore necessary to develop a compressor which is small in size with a constant discharge capacity.

Disclosure of Invention

The invention provides a screw compressor and an air conditioner, which can ensure the exhaust amount on the basis of size reduction.

A first aspect of the present invention provides a screw compressor comprising:

a housing; and

the rotor assembly is rotationally arranged in the shell and comprises a rotating shaft, and a first rotor and a second rotor which are sequentially and coaxially arranged on the rotating shaft, the thread turning directions of the first rotor and the second rotor are opposite, the end faces, close to each other, of the first rotor and the second rotor are jointed, and an air suction port is arranged at the position, corresponding to the joint, of the shell.

In some embodiments, the teeth of the first and second rotors are identical and equal in length.

In some embodiments, both ends of the housing in the axial direction of the rotating shaft are provided with exhaust ports.

In some embodiments, the first rotor and the second rotor are connected to the rotating shaft by a connecting member.

In some embodiments, the connection comprises a circumferential connection configured to circumferentially position the first and second rotors; and/or the connection comprises an axial connection configured to axially position the first and second rotors.

In some embodiments, the first rotor and the second rotor each include a shaft hole for engaging with the rotating shaft, and a tight fit is used between the shaft holes and the rotating shaft.

In some embodiments, the screw compressor comprises two rotor assemblies arranged in parallel, the two rotor assemblies rotating in opposite directions, and the corresponding rotors of the two rotor assemblies intermesh.

In some embodiments, the two rotor assemblies comprise a male rotor assembly and a female rotor assembly, wherein the material of the thread teeth of the rotor of the male rotor assembly comprises a peek material; and/or the material of the thread teeth of the rotor of the female rotor assembly comprises 45-grade steel.

In some embodiments, the rotor assembly further comprises a sliding bearing disposed on the first rotor side and disposed on the second rotor side.

In some embodiments, the plain bearing comprises an outer ring, the shaft comprising a journal, the journal forming an inner ring, the outer ring being coaxially disposed outside the outer circumferential surface of the shaft diameter and rotatable relative to the journal.

A second aspect of the invention provides an air conditioner comprising the screw compressor of the first aspect of the invention.

Based on the technical scheme provided by the invention, the screw compressor comprises a shell and a rotor assembly, wherein the rotor assembly is rotatably arranged in the shell and comprises a rotating shaft, a first rotor and a second rotor which are sequentially and coaxially arranged on the rotating shaft, the rotating directions of the threads of the first rotor and the second rotor are opposite, the end surfaces, close to each other, of the first rotor and the second rotor are jointed, and an air suction port is arranged at the position, corresponding to the joint, of the shell. The two pairs of rotors of the screw compressor are symmetrically arranged, which is equivalent to that two screw compressors are connected in parallel, so that the size of the screw compressor can be greatly reduced under the condition of the same air displacement. In addition, the end faces of the first rotor and the second rotor which are close to each other are jointed, so that the screw compressor sucks air from the joint, and the air respectively flows to the rotors on two sides to be compressed and exhausted, and the whole screw compressor is more compact in structure.

Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:

FIG. 1 is a schematic view of the internal structure of a screw compressor according to an embodiment of the present invention;

FIG. 2 is an exploded schematic view of the male rotor assembly of FIG. 1;

FIG. 3 is a cross-sectional structural schematic view of the male rotor assembly of FIG. 1;

FIG. 4 is an exploded view of the female rotor assembly of FIG. 1;

fig. 5 is a schematic cross-sectional view of the female rotor assembly of fig. 1.

Each reference numeral represents:

1. a housing;

2. a male rotor assembly;

21. a male rotor shaft; 22. a first male rotor; 23. a second male rotor; 24. a key;

25. a gasket; 26. locking the nut;

3. a female rotor assembly;

31. a female rotor shaft; 32. a first female rotor; 33. a second female rotor.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously positioned and the spatially relative descriptors used herein interpreted accordingly.

Referring to fig. 1 to 5, a screw compressor according to an embodiment of the present invention includes:

a housing 1; and

the rotor assembly is rotationally arranged in the shell 1 and comprises a rotating shaft, and a first rotor and a second rotor which are sequentially and coaxially arranged on the rotating shaft, the rotating directions of the threads of the first rotor and the second rotor are opposite, the end faces, close to each other, of the first rotor and the second rotor are jointed, and an air suction port is formed in the position, corresponding to the joint A, of the shell 1.

The two pairs of rotors of the screw compressor provided by the embodiment of the invention are symmetrically arranged, which is equivalent to that two screw compressors are connected in parallel, so that the size of the screw compressor can be greatly reduced under the condition of the same air displacement. In addition, the end faces of the first rotor and the second rotor, which are close to each other, of the screw compressor are jointed, so that the screw compressor sucks air from the joint, and the air respectively flows to the rotors on the two sides to be compressed and exhausted, and the whole screw compressor is more compact in structure.

The screw compressor of this embodiment includes two rotor subassemblies of parallel arrangement, and two rotor subassemblies rotate along opposite direction, and the corresponding rotor intermeshing of two rotor subassemblies.

Specifically, as shown in fig. 1 to 5, the screw compressor of the present embodiment includes a male rotor assembly 2 and a female rotor assembly 3 arranged in parallel. The male rotor assembly 2 comprises a male rotor shaft 21 and a first male rotor 22 and a second male rotor 23 coaxially arranged on the male rotor shaft 21, the end faces of the first male rotor 22 and the second male rotor 23 being in engagement with each other. Likewise, the female rotor assembly 3 includes a female rotor shaft 31 and first and second

female rotors

32 and 33 coaxially provided on the female rotor shaft 31, and end faces of the first and second

female rotors

32 and 33 adjacent to each other are engaged.

The first male rotor 22 and the first female rotor 32 are positioned and intermeshed, and the second male rotor 23 and the second female rotor 33 are positioned and intermeshed. As shown in fig. 1, after entering the casing 1 from the inlet port of the casing 1, the gas is divided into two paths at the joint a, sucked by the rotors meshing with each other at both sides, and compressed.

The housing 1 of the present embodiment is provided with exhaust ports at both ends in the axial direction of the rotating shaft.

As shown in fig. 2, the first male rotor 22 and the second male rotor 23 of the present embodiment have the same tooth profile and the same length. That is, the first male rotor 22 and the second male rotor 23 of the present embodiment are symmetrically arranged. Likewise, the first female rotor 32 and the second female rotor 33 of the present embodiment are symmetrically arranged.

As shown in fig. 3, the first male rotor 22 and the second male rotor 23 are connected to the rotary shaft by a coupling member. The connections comprise circumferential connections configured to position the first male rotor 22 and the second male rotor 23 circumferentially. Specifically, as shown in FIG. 3, the circumferential connection is a key 24. The first male rotor 22 and the second male rotor 23 are connected to the male rotor shaft 21 by means of the same key 24, which key 24 serves to transmit torque.

The coupling of the present embodiment further comprises an axial coupling configured to axially position the first male rotor 22 and the second male rotor 23. As shown in fig. 3, the axial connector includes a lock nut 26. The rotating shaft of the present embodiment has a stepped surface that abuts against the right end surface of the second male rotor 23, and the first male rotor 22 abuts against the second male rotor 23 and is locked by the lock nut 26. Optionally, the connection of this embodiment further comprises a spacer 25 arranged between the lock nut 26 and the first male rotor 22.

As shown in fig. 2, the first male rotor 22 and the second male rotor 23 of the present embodiment each include a shaft hole that is matched with the male rotor shaft 21, and the shaft holes and the male rotor shaft 21 are tightly fitted.

The connection of the various components of the female rotor assembly 3 is shown in fig. 4 and 5, and is substantially the same as the connection of the various components of the male rotor assembly 2, and will not be described again.

The thread teeth of the rotor of the male rotor assembly 2 of the present embodiment comprise peek material. And the thread teeth of the rotor of the female rotor assembly 3 comprise 45 gauge steel. And the surfaces of the thread teeth of the rotor of the female rotor assembly 3 are provided with a ceramic coating.

The end surfaces of the two rotors which are coaxially arranged on the rotating shaft are contacted, so that only bearings are needed to be arranged on two sides of the rotating shaft, the structure of the screw compressor is further compact, and the cost is reduced due to the fact that the number of the bearings is reduced.

Specifically, the rotor assembly of the present embodiment further includes sliding bearings disposed on the first rotor side and disposed on the second rotor side. The sliding bearing of the present embodiment includes an outer ring, and the rotating shaft includes a journal, and the journal forms an inner ring, and the outer ring is coaxially disposed outside an outer peripheral surface of the journal and rotatable with respect to the journal. The sliding bearing of the embodiment forms the inner ring by utilizing the shaft neck, so that the sliding bearing only comprises the outer ring, the structure is simple, the structure of the whole screw compressor is simplified, the volume is reduced, and the size of the compressor is further reduced.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention and not to limit it; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the present invention, it is intended to cover all aspects of the invention as defined by the appended claims.

Claims

1. A screw compressor, comprising:

a housing (1); and

the rotor assembly rotationally set up in casing (1) and including the pivot and coaxial set up in proper order in epaxial first rotor and the second rotor of commentaries on classics, first rotor with the screw thread of second rotor revolves to opposite, first rotor with the terminal surface joint that is close to each other of second rotor, the casing with the position that the junction corresponds is provided with the induction port.

2. The screw compressor according to claim 1, wherein the first rotor and the second rotor have the same tooth profile and the same length.

3. Screw compressor according to claim 1, characterised in that the housing (1) is provided with exhaust ports at both ends in the axial direction of the shaft.

4. The screw compressor according to claim 1, wherein the first rotor and the second rotor are connected to the rotary shaft by a connecting member.

5. The screw compressor of claim 4, wherein the connection comprises a circumferential connection configured to circumferentially position the first and second rotors; and/or the connection comprises an axial connection configured to axially position the first and second rotors.

6. The screw compressor of claim 1, wherein the first rotor and the second rotor each include a shaft bore that mates with the shaft, the shaft bores and the shaft employing a tight fit.

7. The screw compressor according to any one of claims 1 to 6, comprising two said rotor assemblies arranged in parallel, the two said rotor assemblies rotating in opposite directions, and the corresponding rotors of the two said rotor assemblies intermeshing.

8. The screw compressor of claim 7, wherein the two rotor assemblies comprise a male rotor assembly and a female rotor assembly, wherein the material of the thread teeth of the rotors of the male rotor assembly comprises a peek material; and/or the material of the thread teeth of the rotor of the female rotor assembly comprises 45-grade steel.

9. The screw compressor according to claim 7, wherein the rotor assembly further comprises slide bearings disposed on a side of the first rotor and on a side of the second rotor.

10. The screw compressor of claim 9, wherein the plain bearing comprises an outer ring, the shaft comprising a journal, the journal forming an inner ring, the outer ring being coaxially disposed outside an outer peripheral surface of the journal and rotatable relative to the journal.

11. An air conditioner characterized by comprising a screw compressor according to any one of claims 1 to 10.