CN110671324A - Shell structure and compressor comprising same - Google Patents

Abstract

The invention provides a casing structure and a compressor including the same, relates to the technical field of compressors, and solves the technical problems of a gap between a rotor and a casing and low energy efficiency of the compressor. The shell structure includes a shell body with a rotor compression cavity, the rotor is arranged in the rotor compression cavity, the rotor compression cavity is respectively provided with suction orifices and exhaust orifices corresponding to both sides of the rotor, and the inner wall of the rotor compression cavity is provided with a reducing The gap structure, through the gap reduction structure, makes the rotor tooth top and the inner wall of the rotor compression cavity a dynamic zero gap fit structure; the gap reduction structure is a coating made of softer non-metallic materials or soft metal materials; the compressor includes Housing structure and rotor. The invention ensures that the rotor tooth top and the shell body achieve zero-gap fit between the rotor teeth and the shell body by providing a coating layer of non-metal or soft metal material, solves the compressor reliability problem caused by the rotor scratching the shell, reduces the leakage in the tooth top of the screw compressor, and improves the Screw compressor operating efficiency.

Description

Shell structure and compressor containing the same

technical field

The present invention relates to the technical field of compressors, and in particular, to a casing structure and a compressor including the same.

Background technique

As shown in Figure 1, the screw compressor belongs to the positive displacement refrigeration compressor. It uses a pair of intermeshing female and male rotors to rotate in the body cavity, and periodically changes the volume between each pair of tooth slots of the rotor to complete the suction. Gas, compression, exhaust process. As shown in Figure 2, the rotor is assembled in the casing (body) of the compressor. The casing material is generally ductile casting or gray cast iron. Bearings are arranged at both ends of the rotor for support, and the compressor suction is arranged at the suction end of the rotor. The orifice, the compressor discharge orifice is arranged at the discharge end of the rotor. During the compression process of the male and female rotors, as the volume of the tooth slot becomes smaller, the pressure of the tooth slot increases continuously until it communicates with the exhaust port. Since the rotor is a moving part and the casing (body) is a non-moving part, a certain gap should be left between the rotor and the casing (body). It should not be too small. Generally, the gap value is about 5-8% of the rotor diameter, and the diameter of the male rotor is 200mm. The gap value is generally 0.10mm-0.16mm. Only enough clearance can ensure that the rotor does not rub against the casing (body).

The applicant found that the prior art has at least the following technical problems:

In order to ensure that the rotor does not rub against the casing, a certain gap must be reserved between the rotor tooth tip and the casing. Since the screw compressor is in operation, the force deformation and thermal deformation of the rotor change. In order to ensure the reliability of the compressor , the gap value can only take the maximum value, and leave a certain safety margin.

Due to the existence of the above-mentioned gap, the rotor is not in a fully sealed space during the compression process, and the gas in the high-pressure cogging will leak to the gas in the low-pressure cogging during the compression process, and the leaked gas will be compressed again, resulting in excess gas. Compression power consumption, and due to the existence of leakage channels, reduces the suction capacity of the compressor, resulting in low energy efficiency of the compressor.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a casing structure and a compressor including the same, so as to solve the technical problem of low energy efficiency of the compressor caused by a gap between the rotor and the casing in the prior art.

For achieving the above object, the invention provides the following technical solutions:

A casing structure provided by the present invention includes a casing body, a rotor compression cavity is arranged in the casing body, a rotor is arranged in the rotor compression cavity, and suction holes are respectively provided in the rotor compression cavity corresponding to both sides of the rotor There is a gap reduction structure on the inner wall of the rotor compression cavity, and the gap reduction structure makes the rotor tooth top and the inner wall of the rotor compression cavity a zero-gap fit structure.

On the basis of the above technical solutions, the present invention can also be improved as follows.

As a further improvement of the present invention, the gap reducing structure is a plating layer located on the peripheral side of the rotor.

As a further improvement of the present invention, the coating layer is made of a non-metallic material or a soft metal material with relatively soft hardness.

As a further improvement of the present invention, in the original state, the rotor tooth tip is in contact with the surface of the plating layer.

As a further improvement of the present invention, the thickness of the plating layer is greater than the maximum deformation of the rotor.

As a further improvement of the present invention, the coating layer is made of polytetrafluoroethylene material.

As a further improvement of the present invention, the coating layer is made of babbitt material.

As a further improvement of the present invention, the coating layers are continuously and uniformly arranged along the axial direction of the rotor compression cavity; alternatively, the coating layers are arranged at intervals along the axial direction of the rotor compression cavity, and each section of the coating layer corresponds to the rotor teeth Top position setting.

As a further improvement of the present invention, a filter device is provided at the exhaust port.

A compressor provided by the present invention includes the casing structure and a rotor rotatably arranged in the casing structure.

Compared with the prior art, the present invention has the following beneficial effects:

The patent of the present invention solves the problem that the tooth top clearance of the screw compressor is too large at present. The inner wall of the rotor compression cavity of the casing body is plated with non-metallic or soft metal materials, so as to ensure that the rotor tooth top and the casing body achieve zero clearance fit between the rotor and the casing body. Solve the compressor reliability problem caused by the rotor scratching the casing, reduce the leakage in the tooth tip of the screw compressor, and improve the operating efficiency of the screw compressor.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to these drawings without creative efforts.

Fig. 1 is the principle diagram of screw rotor compressed gas in the prior art;

Fig. 2 is the screw rotor arrangement diagram in the prior art;

3 is a cross-sectional view of the housing structure of the present invention.

In the figure 1, the shell body; 2, the rotor compression chamber; 3, the suction port; 4, the exhaust port; 5, the coating.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. Obviously, the described embodiments are only some, but not all, embodiments of the present invention. Based on the embodiments of the present invention, all other implementations obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

The present invention provides a casing structure, comprising a casing body 1, a rotor compression cavity 2 is arranged in the casing body 1, the rotor is arranged in the rotor compression cavity 2, and the rotor compression cavity 2 is respectively provided with suction orifices corresponding to both sides of the rotor 3 and the exhaust port 4, the inner wall of the rotor compression chamber 2 is provided with a clearance reduction structure, through the clearance reduction structure, the rotor tooth top and the inner wall of the rotor compression chamber 2 have a zero clearance fit structure.

By setting the gap reduction structure, the tooth top and the rotor compression cavity 2 are matched with zero gap during the rotor rotation, and there is no gap, so that the rotor is in a fully sealed space during the compression process. The gas in the slot will not leak to the gas in the low-pressure cogging slot, and there will be no excess compression power consumption, which ensures the suction capacity of the compressor and improves the energy efficiency of the compressor.

As an optional embodiment, the gap reducing structure is the plating layer 5 located on the peripheral side of the rotor.

Further, in order to prevent the cladding layer 5 from being blocked by debris scraped by the rotor, in the present invention, the cladding layer 5 is made of a non-metallic material or a soft metal material with relatively soft hardness.

The patent of the present invention solves the problem that the tooth top clearance of the screw compressor is too large at present. The inner wall of the rotor compression cavity of the casing body is plated with non-metallic or soft metal materials, so as to ensure that the rotor tooth top and the casing body achieve zero clearance fit between the rotor and the casing body. Solve the compressor reliability problem caused by the rotor scratching the casing, reduce the leakage in the tooth tip of the screw compressor, and improve the operating efficiency of the screw compressor.

By arranging the plating layer 5, in the original state, that is, when the rotor is assembled into the housing body 1, the rotor tooth tips are connected to the surface of the plating layer 5 in contact with each other, and there is no need to reserve a gap.

Since the deformation of the rotor varies during the rotation, there is a maximum deformation. In order to ensure that the coating layer 5 still partially remains after being scraped and prevent the rotor from scratching the inner wall of the shell body 1, in the present invention, the thickness of the coating layer 5 is greater than the maximum deformation of the rotor. quantity.

It should be noted that the plating layer 5 is made of polytetrafluoroethylene material.

Alternatively, the plating layer 5 is made of babbitt material.

Of course, the plating layer 5 can also be made of other materials, and is not limited to the materials used in the above two specific embodiments.

As an optional embodiment, the plating layer 5 is continuously and uniformly arranged along the axial direction of the rotor compression cavity.

As another optional embodiment, the plating layers 5 are arranged at intervals along the axial direction of the rotor compression cavity, which can save materials and costs, and each section of the plating layers 5 is arranged corresponding to the position of the rotor tooth tip.

In order to prevent the scraped coating material from entering the air-conditioning system together with the exhaust high-pressure gas, a filter device is provided at the position of the exhaust port 4, and the filter device can be a filter screen. The pore size of the filter mesh meets the requirement that the scraped coating material cannot pass through.

Example 1:

As shown in FIG. 3 , the rotor cavity coating shell structure of the screw compressor of the present invention is shown. The shell body 1 is respectively provided with a suction port 3 , an exhaust port 4 and a rotor compression chamber 2 . Inside the rotor compression chamber 2 The surface is plated with a non-metal or soft metal material, the non-metal material may be a softer non-metal such as polytetrafluoroethylene, and the soft metal material may be a softer metal such as babbitt. The thickness of the coating on the inner surface of the rotor compression cavity 2 is greater than the deformation of the rotor, which ensures that even if the coating material on the surface of the rotor cavity is only scraped off during the operation of the compressor, it will not contact the casting of the shell body 1. When the rotor is assembled to the shell body 1, there is no gap between the rotor tooth tip and the coating material of the rotor compression chamber 2, that is, zero clearance. After the compressor is running, the coating 5 material on the inner surface of the rotor compression chamber 2 will be scraped off when the rotor is deformed. , the greater the deformation of the rotor during operation, the more the coating layer 5 material will be scraped off, but when the rotor reaches the maximum deformation amount, the coating material will not be scraped off any more. At this time, the leakage of the compressor tooth top is the least, and the high-pressure cogging gas will not leak to the low-pressure cogging during the rotor compression process, and the compressor has the highest operating efficiency.

The coating material scraped off by the rotor is discharged through the exhaust port 4 with the compressed gas of the compressor, and a filter device can be added at the exhaust port 4 to prevent the coating material from entering the air conditioning system together with the exhaust high-pressure gas.

A compressor provided by the present invention includes a casing structure and a rotor rotatably arranged in the casing structure.

Further, the above-mentioned compressor is a screw compressor. The invention provides a screw compressor. The inner wall of the rotor compression cavity is plated with non-metallic or soft metal materials, which can ensure the zero-gap design between the rotor tooth tip and the shell body, and even if the rotor scrapes the rotor cavity, it will not cause compression. To solve the reliability problem of the compressor, through the zero-gap control between the rotor tip and the casing, the leakage in the rotor tip is reduced, the compressor compression power consumption is reduced, and the operating efficiency of the screw compressor is improved.

It should be noted here that "inward" refers to the direction toward the center of the accommodating space, and "outward" refers to the direction away from the center of the accommodating space.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", " Rear, Left, Right, Vertical, Horizontal, Top, Bottom, Inner, Outer, Clockwise, Counterclockwise, Axial, The orientations or positional relationships indicated by "radial direction", "circumferential direction", etc. are based on the orientations or positional relationships shown in FIG. Elements must have a particular orientation, be constructed and operate in a particular orientation and are therefore not to be construed as limitations of the invention.

In addition, the terms "first" and "second" are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature delimited with "first", "second" may expressly or implicitly include at least one of that feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise expressly and specifically defined.

In the present invention, unless otherwise expressly specified and limited, the terms "installed", "connected", "connected", "fixed" and other terms should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection , or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between the two elements, unless otherwise specified limit. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

In the present invention, unless otherwise expressly specified and limited, a first feature "on" or "under" a second feature may be in direct contact between the first and second features, or the first and second features indirectly through an intermediary touch. Also, the first feature being "above", "over" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is level higher than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature has a lower level than the second feature.

In the description of this specification, description with reference to the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples", etc., mean specific features described in connection with the embodiment or example , structure, material or feature is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, those skilled in the art may combine and combine the different embodiments or examples described in this specification, as well as the features of the different embodiments or examples, without conflicting each other.

The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention. should be included within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims (10)

1. The utility model provides a shell structure, includes the shell body, this internal rotor compression chamber that has of shell, the rotor arranges in the rotor compression intracavity, the rotor compression chamber is provided with respectively corresponding to the rotor both sides and inhales gas port and exhaust vent, a serial communication port, be equipped with on the rotor compression intracavity wall and subtract the clearance structure, through subtract the clearance structure make the rotor addendum with for rotating zero clearance fit structure between the rotor compression intracavity wall.

2. The casing structure according to claim 1, wherein the gap reducing structure is a plating layer on a circumferential side of the rotor.

3. The housing structure of claim 2, wherein the coating is made of a non-metallic material or a soft metallic material having a softer hardness.

4. The housing structure of claim 2, wherein in a home state, the rotor teeth tips are in contact with the coating surface.

5. The housing structure of claim 4, wherein the coating thickness is greater than a maximum deflection of the rotor.

6. The shell structure of claim 3, wherein the coating is made of a polytetrafluoroethylene material.

7. The housing structure of claim 3, wherein the coating is made of babbitt metal.

8. The casing structure according to claim 2, 3, 4, 5, 6 or 7, wherein the coating is continuously and uniformly arranged along the axial direction of the rotor compression chamber; or the coatings are arranged at intervals along the axial direction of the rotor compression cavity in a segmented mode, and each segment of the coating is arranged corresponding to the tooth crest position of the rotor.

9. A housing structure according to claim 1 or 2 or 3 or 4 or 5 or 6 or 7, characterized in that the vent opening is provided with a filter means.

10. A compressor, characterized by comprising a housing structure according to any one of claims 1-9 and a rotor rotatably arranged in said housing structure.

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