Compressor structure with good cooling effect and magnetic suspension compressor

Abstract

The application provides a compressor structure and a magnetic suspension compressor with high cooling efficiency. The compressor structure comprises a shell and a magnetic suspension bearing, the shell is internally provided with a cover plate, a first side of the cover plate forms a cooling cavity, and one end of the magnetic suspension bearing is located in the cooling cavity. The compressor structure and the magnetic suspension compressor with high cooling efficiency provided by the application directly form a liquid inlet cavity and a cooling cavity in the shell by arranging the cover plate, and the coolant is sprayed and throttled through the spray holes on the cover plate, so that the cooling effect of the magnetic suspension bearing is increased. Meanwhile, the axis of the spray hole is obliquely arranged, so that the refrigerant can directly point to the magnetic suspension bearing or the rotating shaft, thereby increasing the cooling efficiency of the magnetic suspension bearing or even the rotating shaft. The cooling by the refrigerant can directly pass through the gap at the magnetic suspension bearing into the compressor after cooling. The cooling can overcome the problem that the coolant and the refrigerant need to be separated in the prior art.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of compression equipment, in particular to a compressor structure with good cooling effect and a magnetic suspension compressor. BACKGROUND

[0002] Centrifugal refrigeration compressor belongs to speed type compressor, compressor rotor rotates at high speed in work, bearing is needed to support the rotor, the existing compressor generally adopts oil lubricated bearing to support, its has the remarkable advantages of low cost, simple structure, high reliability, etc. at present stage is widely applied, but the oil and refrigerant in the unit cannot be completely isolated, the lubricating oil will leak into the refrigeration system during operation, the refrigerant needs to be purified by additional purification device, the lubricating oil is recovered, which leads to the structure of oil bearing compressor, and the mixed lubricating oil in the refrigerant has a great influence on the heat exchange performance of the refrigerant. The magnetic suspension bearing belongs to oil-free bearing, which has the advantages of reducing the cost of compressor and canceling the lubrication of bearing to simplify the internal structure, but because there is no lubrication in the magnetic suspension bearing, it cannot be effectively cooled. SUMMARY

[0003] In order to solve the technical problem that the magnetic suspension bearing in the compressor in the prior art cannot be effectively cooled, a compressor structure with high cooling efficiency and a magnetic suspension compressor are provided, which utilize the injection hole to spray the magnetic suspension bearing.

[0004] A compressor structure comprises a shell and a magnetic suspension bearing, the shell is internally provided with a cover plate, a first side of the cover plate forms a cooling cavity, one end of the magnetic suspension bearing is located in the cooling cavity, a second side of the cover plate forms a liquid inlet cavity, and a spraying mechanism is arranged on the cover plate, and the coolant in the liquid inlet cavity is sprayed into the cooling cavity through the spraying mechanism.

[0005] An end cover is arranged at the end of the shell, and the liquid inlet cavity is surrounded by the cover plate and the end cover.

[0006] The cover plate is attached to the end cover, and a flow channel is arranged on the cover plate, the inlet of the spraying mechanism is located in the flow channel, and the flow channel constitutes the liquid inlet cavity.

[0007] An annular protrusion is arranged on the end cover, an axial bearing is arranged on the inner surface of the annular protrusion, and the cover plate is sleeved on the outer surface of the annular protrusion.

[0008] A liquid inlet flow channel is arranged on the shell and / or the end cover, a first end of the liquid inlet flow channel communicates with the liquid inlet cavity, and a second end of the liquid inlet flow channel communicates with the outside of the shell.

[0009] The compressor structure further comprises a rotating shaft, the injection mechanism comprises at least one injection hole, and an axis of the injection hole is parallel to an axis of the rotating shaft; or the compressor further comprises a rotating shaft, the injection mechanism comprises at least one injection hole, and an axis of the injection hole has a first included angle with an axis of the rotating shaft.

[0010] The number of the injection holes is at least two, and all the injection holes are uniformly distributed with the axis of the rotating shaft as an axis.

[0011] The compressor structure further comprises a rotating shaft, the injection mechanism comprises at least one injection hole, and an axis of the injection hole has a first included angle with an axis of the rotating shaft; or the compressor further comprises a rotating shaft, the injection mechanism comprises at least one injection hole, and an axis of the injection hole has a first included angle with an axis of the rotating shaft.

[0012] The number of the injection hole groups is at least two, and all the injection hole groups are uniformly distributed with the axis of the rotating shaft as an axis.

[0013] The diameter of the injection hole ranges from 2 mm to 6 mm.

[0014] The second end of the liquid inlet flow channel is provided with a flow adjusting mechanism.

[0015] The number of the magnetic suspension bearings is two, and one cover plate is arranged at each of the magnetic suspension bearings.

[0016] The coolant comprises a refrigerant.

[0017] A magnetic suspension compressor comprising the above compressor structure.

[0018] The compressor structure and the magnetic suspension compressor provided by the application have the advantages that the cover plate is arranged directly in the housing to form a liquid inlet cavity and a cooling cavity, the injection holes on the cover plate are used to inject and throttle the coolant, the cooling effect on the magnetic suspension bearing is increased, the axis of the injection hole is inclined to direct the refrigerant directly to the magnetic suspension bearing or the rotating shaft, the cooling efficiency of the magnetic suspension bearing or even the rotating shaft is increased, the refrigerant is used for cooling, and the refrigerant can enter the compressor directly through the gap at the magnetic suspension bearing after cooling. The cooling can overcome the problem that the coolant and the refrigerant need to be separated in the prior art. BRIEF DESCRIPTION OF DRAWINGS

[0019] Fig. 1 FIG. 1 is a structural schematic view of a compressor structure of an embodiment of the compressor structure and the magnetic suspension compressor with good cooling effect provided by the application;

[0020] Fig. 2 FIG. 2 is a structural schematic view of an end cover of an embodiment of the compressor structure and the magnetic suspension compressor with good cooling effect provided by the application.

[0021] Fig. 3 A schematic diagram of the cover plate of the compressor structure with good cooling effect and the embodiment of the magnetic levitation compressor provided by the present invention;

[0022] Fig. 4 A cross-sectional view of the cover plate of an embodiment of a compressor structure with good cooling effect and a magnetic levitation compressor provided by the present invention;

[0023] In the picture:

[0024] 1. Housing; 2. Magnetic levitation bearing; 3. Cover plate; 31. Flow channel; 11. Cooling chamber; 12. Liquid inlet chamber; 4. End cap; 5. Liquid inlet flow channel; 6. Shaft; 7. Injection hole; 8. Stator core. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the invention.

[0026] The magnetic levitation centrifugal compressor contains four bearings: two axial bearings and two radial bearings. The two axial bearings can be cooled together with the motor shaft. However, the two radial bearings are magnetically levitation bearings, which are two independent structures located at the front and rear ends of the motor, respectively. Existing magnetically levitation centrifugal compressors lack cooling technology for these bearings. Therefore, this application provides a method for cooling the magnetically levitation bearings. Figs. 1 to 4 The compressor structure shown includes a housing 1 and a magnetic levitation bearing 2. A cover plate 3 is provided inside the housing 1. A cooling chamber 11 is formed on the first side of the cover plate 3. One end of the magnetic levitation bearing 2 is located in the cooling chamber 11. A liquid inlet chamber 12 is formed on the second side of the cover plate 3. A spraying mechanism is provided on the cover plate 3. The coolant in the liquid inlet chamber 12 is sprayed into the cooling chamber 11 through the spraying mechanism. The coolant is throttled or atomized by the spraying mechanism and then enters the cooling chamber 11, thereby filling the entire cooling chamber 11 and cooling the magnetic levitation bearing 2 and other structures (such as the stator core and part of the shaft) located in the cooling chamber 11. A stator core 8 is also provided on the inner surface of the housing 1. The magnetic levitation bearing 2 is located on the stator core 8. The refrigerant entering the cooling chamber 11 enters the gap between the magnetic levitation bearing 2 and the stator core 8 from the end of the magnetic levitation bearing 2 and flows out from the other end of the magnetic levitation bearing 2, thereby cooling the entire magnetic levitation bearing 2.

[0027] The end of the shell 1 is provided with an end cover 4, which cooperates with the shell 1 to form a sealed cavity, the stator core 8, the magnetic suspension bearing 2 and part of the rotating shaft are inside the sealed cavity, the cover plate 3 and the end cover 4 form the liquid inlet cavity 12 to form the coolant containing space.

[0028] The cover plate 3 is attached to the end cover 4, and the cover plate 3 is provided with a flow channel 31, the inlet of the injection mechanism is in the flow channel 31, and the flow channel 31 constitutes the liquid inlet cavity 12, wherein the cover plate 3 is recessed to form the flow channel 31, and the shape of the flow channel 31 is annular, the axis of the annular is collinear with the axis of the rotating shaft, so that the injection hole 7 can spray the coolant into the cooling cavity 11 at any position.

[0029] The end cover 4 is provided with an annular protrusion, the inner surface of the annular protrusion is provided with an axial bearing, the cover plate 3 is sleeved on the outer surface of the annular protrusion, and the annular protrusion realizes the installation of the axial bearing, and cooperates with the cover plate 3 and the end cover 4 to limit the space of the flow channel 31, thereby limiting the space of the liquid inlet cavity 12.

[0030] The shell 1 and / or the end cover 4 is provided with a liquid inlet flow channel 5, the first end of the liquid inlet flow channel 5 is communicated with the liquid inlet cavity 12, and the second end of the liquid inlet flow channel 5 is communicated with the outside of the shell 1, the refrigerant outside the compressor structure is introduced into the liquid inlet cavity 12 through the liquid inlet flow channel 5, the shell 1 is provided with a box flow channel, the end cover 4 is provided with a first flow channel and a second flow channel, the first end of the first flow channel is communicated with the box flow channel, the second end of the first flow channel is communicated with the first end of the second flow channel, and the second end of the second flow channel is communicated with the liquid inlet cavity 12, and the refrigerant enters the liquid inlet cavity 12 in sequence through the box flow channel, the first flow channel and the second flow channel.

[0031] The compressor structure further comprises a rotating shaft 6, the injection mechanism comprises at least one injection hole 7, and the axis of the injection hole 7 is parallel to the axis of the rotating shaft 6, so that the refrigerant sprayed by the injection hole 7 can be directly sprayed on the magnetic suspension bearing 2, thereby increasing the cooling effect of the magnetic suspension bearing 2; or the compressor further comprises a rotating shaft 6, the injection mechanism comprises at least one injection hole 7, and the axis of the injection hole 7 has a first included angle with the axis of the rotating shaft 6, preferably, the outlet of the injection hole 7 points to the connection between the magnetic suspension bearing 2 and the stator core 8, thereby increasing the amount of refrigerant entering the gap between the magnetic suspension bearing 2 and the stator core 8, thereby increasing the cooling effect of the magnetic suspension bearing 2 and the stator core 8.

[0032] The number of the injection holes 7 is at least two, and all the injection holes 7 are evenly distributed around the axis of the rotating shaft 6, that is, the central angle of the circle formed by the adjacent two injection holes 7 around the axis of the rotating shaft 6 is equal. For example, when the number of the injection holes 7 is four, the central angle of the circle formed by the adjacent two injection holes 7 is 90°, and when the number of the injection holes 7 is ten, the central angle of the circle formed by the adjacent two injection holes 7 is 36°.

[0033] The compressor structure further comprises a rotating shaft 6, and the injection mechanism comprises at least one injection hole group, each of the injection hole groups comprises at least two injection holes 7, all the injection holes 7 have a first included angle with the axis of the rotating shaft 6, and the axes of any two injection holes 7 in the same injection hole group have a second included angle, wherein the angle of the second included angle ranges from 60° to 120°, that is, at any position of the cover plate 3, there are multiple injection holes 7 facing different directions, so that the coolant in the liquid inlet cavity 12 can be injected into the cooling cavity 11 through the injection holes 7 facing different directions, thereby increasing the uniformity of the distribution of the refrigerant in the cooling cavity 11.

[0034] The number of the injection hole groups is at least two, and all the injection hole groups are evenly distributed around the axis of the rotating shaft 6, that is, the central angle of the circle formed by the adjacent two injection hole groups around the axis of the rotating shaft 6 is equal. For example, when the number of the injection hole groups is four, the central angle of the circle formed by the adjacent two injection hole groups is 90°, and when the number of the injection hole groups is ten, the central angle of the circle formed by the adjacent two injection hole groups is 36°.

[0035] The diameter of the injection hole 7 ranges from 2 mm to 6 mm. If the diameter of the injection hole 7 is too large or too small, the magnetic suspension bearing 2 cannot be cooled properly, which may cause the compressor to malfunction. If the diameter of the injection hole 7 is too large, liquid may accumulate at the magnetic suspension bearing 2, which affects the normal operation of the magnetic suspension bearing 2.

[0036] The second end of the liquid inlet flow channel 5 is provided with a flow adjusting mechanism, which is used to control the amount of refrigerant entering the liquid inlet cavity 12, thereby controlling the amount of refrigerant entering the cooling cavity 11, and ensuring that the magnetic suspension bearing 2 is cooled to the best effect.

[0037] The number of the magnetic suspension bearings 2 is two, and each of the magnetic suspension bearings 2 is provided with a cover plate 3, that is, each of the magnetic suspension bearings 2 forms a liquid inlet cavity 12 and a cooling cavity 11 for injection cooling.

[0038] The coolant comprises refrigerant, and the refrigerant can directly pass through the gap at the magnetic suspension bearing 2 into the compressor after cooling, and the cooling can overcome the problem of separation of the coolant and the refrigerant in the prior art.

[0039] A magnetic suspension compressor comprising the above compressor structure.

[0040] The above-mentioned embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it cannot be understood as the limitation of the patent scope of the present application. It should be pointed out that for ordinary skilled in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A compressor construction comprising a housing (1) and a magnetic bearing (2), characterized in that: The shell (1) is internally provided with a cover plate (3), a first side of the cover plate (3) forms a cooling cavity (11), one end of the magnetic suspension bearing (2) is located in the cooling cavity (11), a second side of the cover plate (3) forms a liquid inlet cavity (12), and the cover plate (3) is provided with a spraying mechanism, the coolant in the liquid inlet cavity (12) is sent to the cooling cavity (11) after being throttled or atomized by the spraying mechanism; an end of the shell (1) is provided with an end cover (4), the liquid inlet cavity (12) is surrounded between the cover plate and the end cover; the cover plate (3) is attached to the end cover (4), and the cover plate (3) is provided with a flow channel (31), an inlet of the spraying mechanism is located in the flow channel (31), and the flow channel (31) constitutes the liquid inlet cavity (12); the end cover (4) is provided with an annular protrusion, an inner surface of the annular protrusion is provided with an axial bearing, and the cover plate (3) is sleeved on an outer surface of the annular protrusion.

2. The compressor structure of claim 1, wherein: The shell (1) and / or the end cover (4) is provided with a liquid inlet flow channel (5), a first end of the liquid inlet flow channel (5) is in communication with the liquid inlet cavity (12), and a second end of the liquid inlet flow channel (5) is in communication with the outside of the shell (1).

3. The compressor structure of claim 1, wherein: The compressor structure further comprises a rotating shaft (6), the spraying mechanism comprises at least one spraying hole (7), and an axis of the spraying hole (7) is parallel to an axis of the rotating shaft (6); or, the axis of the spraying hole (7) has a first included angle with the axis of the rotating shaft (6).

4. The compressor structure of claim 1, wherein: The compressor structure further comprises a rotating shaft (6), the spraying mechanism comprises at least one spraying hole group, each spraying hole group comprises at least two spraying holes (7), all the spraying holes (7) have a first included angle with the axis of the rotating shaft (6), and any two spraying holes (7) in the same spraying hole group have a second included angle.

5. The compressor structure of claim 2, wherein: The second end of the liquid inlet flow channel (5) is provided with a flow regulating mechanism.

6. The compressor structure of claim 1, wherein: The coolant comprises a refrigerant.

7. A magnetic levitation compressor characterized by: The compressor structure comprises the compressor structure according to any one of claims 1 to 6. The compressor structure comprises the compressor structure according to any one of claims 1 to 6.

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