A new type of cylinder and rotor compressor

Abstract

The application provides a novel cylinder and rotor compressor, which comprises a cylinder barrel and a threaded part, the cylinder barrel and the threaded part are fixedly connected, a threaded hole is arranged in the threaded part, the threaded part is made of hard alloy, the hard alloy is tungsten-cobalt hard alloy, and the fixed connection mode of the cylinder barrel and the threaded part is that the threaded part is integrally cast with the cylinder barrel when a cylinder blank is cast. The fixed connection mode of the cylinder barrel and the threaded part is that a mounting through hole is arranged on the cylinder barrel, and the threaded part is in interference fit with the mounting through hole. The mounting through hole is a tapered through hole. The technical scheme can reduce the deformation of the sliding vane groove when the bolt is locked, and the machining difficulty of the surface of the cylinder is not greatly increased.

Description

Technical Field

[0001] This application relates to the field of compressors, and in particular to a novel cylinder and rotary compressor. Background Technology

[0002] Rotary compressors are widely used in refrigeration, air conditioning and other fields. A rotary compressor typically includes a housing, motor, pump body assembly, upper cover, lower cover, distributor assembly, etc. The pump body assembly includes: upper bearing, lower bearing, cylinder, crankshaft, piston, vane, spring, upper silencer, lower silencer, etc.

[0003] The most common raw material for making cylinders is gray iron. The cylinder manufacturing process is as follows: 1. Casting cylinder blanks; 2. Rough machining - machining threaded holes on the cylinder blanks (the function of the threaded holes is to lock the upper bearing and other parts onto the cylinder with bolts); 3. Finish machining - precision grinding of the inner circle and outer surface of the cylinder and machining of the sliding vane groove.

[0004] If the cylinder is not rigid enough, the bolts will cause significant elastic deformation of the cylinder during the process of tightening the upper bearing and other parts into the cylinder (mainly deformation of the vane groove, which will significantly reduce the width of the vane groove, and there will also be slight deformation in other positions). This will lead to risks such as pump leakage and vane jamming. Currently, in order to overcome the elastic deformation caused by the bolts tightening the cylinder, the method of increasing the vane thickness and the cylinder groove width is generally adopted. However, this method will lead to an increase in pump leakage (refrigerant leakage) and a reduction in the cooling capacity of the compressor.

[0005] The benefits of increasing cylinder hardness are: 1. Improved cylinder wear resistance and extended service life. 2. Reduced elastic deformation of the vane groove during locking. 3. Reduced pump leakage.

[0006] refer to Figure 1 Table 1 The following shows the changes in the cylinder slide groove size during bolt tightening for a certain model of cylinder under different hardness conditions: The cylinders have hardnesses of HB210 and HB280 respectively, and the original groove width of the cylinders is 3.1967mm. Two bolts are used to apply locking force on the left and right sides of the cylinder slide groove.

[0007] Experiments have shown that as the hardness of the cylinder increases, the elastic deformation of the sliding groove is significantly reduced when the bolts are tightened.

[0008] Table 1:

[0009] However, excessive pursuit of hardness can also lead to a decrease in the machinability of parts. For example, excessive hardness can increase cutting force, which can lead to faster tool wear and increased surface roughness when machining cylinders, thus affecting machining accuracy.

[0010] Therefore, how to reduce the deformation of the vane groove when tightening the bolts without significantly increasing the machining difficulty of the cylinder surface has become the key problem that this application needs to solve. Summary of the Invention

[0011] To overcome at least one aspect of the aforementioned defects and problems in the prior art, this application provides a novel cylinder, including a cylinder barrel and a threaded portion, wherein the cylinder barrel and the threaded portion are fixedly connected, the threaded portion has a threaded hole, and the threaded portion is made of cemented carbide.

[0012] In a preferred embodiment, the cemented carbide is a tungsten-cobalt cemented carbide.

[0013] In a preferred embodiment, the cylinder barrel and the threaded portion are fixedly connected in such a way that the threaded portion is cast integrally with the cylinder barrel during the casting of the cylinder blank.

[0014] In a preferred embodiment, the cylinder and the threaded part are fixedly connected as follows: the cylinder has a mounting through hole, and the threaded part is interference-fitted with the mounting through hole.

[0015] In a preferred embodiment, the mounting through hole is a tapered through hole.

[0016] To overcome at least one aspect of the aforementioned defects and problems in the prior art, this application provides a rotary compressor comprising the novel cylinder as described above.

[0017] In summary, the technical solution of this application can reduce the deformation of the vane groove and the leakage of the pump body when the bolts are tightened, without significantly increasing the machining difficulty of the cylinder surface. Attached Figure Description

[0018] Figure 1 This is a schematic diagram showing the change in the size of the cylinder slide groove during the locking process using bolt tests when the cylinder of a certain model has different hardness. Figure 2 This is an exploded view of Embodiment 1 of this application; Figure 3 This is an exploded view of Embodiment 2 of this application; Figure 4 This is a schematic diagram of Embodiment 2 of this application; Figure 5 for Figure 4 A cross-sectional view along the AA direction.

[0019] Explanation of reference numerals in the attached drawings: 1. Bolt; 2. Cylinder; 21. Tapered through hole; 22. Sliding vane groove; 3. Threaded part. Detailed Implementation

[0020] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0021] Example 1: Refer to Appendix Figure 2 .

[0022] Example 1 provides a novel cylinder, including a cylinder barrel 2 and a threaded portion 3. The threaded portion 3 is made of cemented carbide, preferably a tungsten-cobalt cemented carbide, such as YG8 or YG15. The threaded portion 3 is cast integrally with the cylinder barrel 2 during the casting of the cylinder blank. That is, the cylinder barrel 2 and the threaded portion 3 are machined into one piece by a mold during the casting stage of the cylinder blank. The threaded portion 3 is part of the cylinder blank. In this way, during subsequent roughing and finishing processes, only when machining the threaded portion 3 (the material of which is tungsten-cobalt cemented carbide such as YG8 or YG15) will the tool wear be accelerated and the machining difficulty be increased. However, when roughing or finishing other parts of the cylinder (the material is gray iron), the tool wear will not be accelerated or the machining difficulty will not be increased.

[0023] Meanwhile, during the subsequent process of locking the upper bearing and other parts onto the cylinder using bolt 1, the material of the bolt locking part is a hard tungsten-cobalt hard alloy, which reduces the elastic deformation of the cylinder during the locking process (the main part that produces elastic deformation is the cylinder vane groove 22). Due to the reduction in elastic deformation during the locking process, the separation gap between the pump body vane and the cylinder groove can be appropriately reduced. This prevents the vane from getting stuck after the bolt is locked. The reduction in the separation gap of the vane groove 22 will greatly benefit the compressor's performance, such as reducing refrigerant leakage and improving compressor performance.

[0024] Example 2: Refer to Appendix Figure 3 ~Appendix Figure 5 .

[0025] Another embodiment of the present invention, such as Figure 3As shown, a novel cylinder is provided. The difference between this embodiment and Embodiment 1 is that a tapered through-hole 21 is machined after casting the cylinder blank. The threaded portion 3 is a separate component that can be interference-fitted with the tapered through-hole 21. Before the rough machining process begins, the threaded portion 3 is embedded into the tapered through-hole 21, at which point the threaded portion 3 and the tapered through-hole 21 are integrated. Then, a threaded hole is formed on the threaded portion 3. The technical effects and problems solved by this embodiment are the same as those of Embodiment 1, and it also overcomes the defects of the prior art and achieves the inventive objective of this application.

[0026] Example 3: Example 3 provides a rotary compressor that includes a novel cylinder as described in any of Examples 1 to 2.

[0027] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A novel cylinder, comprising a cylinder barrel, characterized in that: It also includes a threaded part, the cylinder and the threaded part are fixedly connected, the threaded part has a threaded hole, and the threaded part is made of cemented carbide.

2. The novel cylinder according to claim 1, characterized in that: The cemented carbide is a tungsten-cobalt cemented carbide.

3. The novel cylinder according to claim 1, characterized in that: The cylinder barrel and the threaded part are fixedly connected in such a way that the threaded part is cast as a whole with the cylinder barrel when the cylinder blank is cast.

4. The novel cylinder according to claim 1, characterized in that: The cylinder and the threaded part are fixedly connected in the following manner: the cylinder has a mounting through hole, and the threaded part is interference-fitted with the mounting through hole.

5. The novel cylinder according to claim 4, characterized in that: The mounting through hole is a tapered through hole.

6. A rotary compressor, characterized in that: include: The novel cylinder according to any one of claims 1-5.

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