Cylinder cover structure of rotor compressor and horizontal compressor

Abstract

The rotor compressor cylinder cover structure comprises a cylinder cover and a long shaft, the cylinder cover comprises a shaft neck, a through hole is formed in the shaft neck, the long shaft is connected with the shaft neck in a sliding mode and rotatably arranged in the through hole of the shaft neck, a transverse oil hole is formed in the long shaft, and the transverse oil hole is communicated with the shaft neck in the direction perpendicular to the axis of the cylinder cover. A pressure relief hole is formed in the top of the shaft neck, and when the long shaft rotates in the through hole of the shaft neck and the transverse oil hole rotates to the position of the pressure relief hole, the transverse oil hole is connected and communicated with the pressure relief hole. According to the technical scheme, the oil film thickness of the crankshaft long shaft is increased, abrasion of the crankshaft long shaft under long-term severe working condition operation is reduced, and the reliability of the compressor pump body is improved.

Description

Technical Field

[0001] The present invention relates to the field of compressors, and in particular to a rotor compressor cylinder cover structure and a horizontal compressor. Background Art

[0002] The oil supply principle and oil suction structure of horizontal compressors are different from those of vertical compressors. The oil suction structure is responsible for transporting lubricating oil from the oil pool to each moving pair. The quality of its design structure directly affects the reliability of the compressor.

[0003] The existing horizontal compressor oil pumping structure mostly relies on the pressure difference between the two ends of the crankshaft to pump oil through the oil suction pipe inserted into the oil pool through the lower muffler. However, for different speed working conditions, the existing oil pumping structure has the problem of insufficient oil pumping.

[0004] The horizontal rotor compressor has the problem of wear at the root of the crankshaft major axis during the low-speed intermittent life test. This is because: the horizontal model operates under low-speed intermittent conditions, the oil output of the upper bearing hole and the upper spiral groove is small, and after long-term operation, the wear at the root of the crankshaft major axis is generally obvious. Summary of the invention

[0005] In view of the problems in the prior art, an object of the present invention is to provide a rotor compressor cylinder head structure and a horizontal compressor thereof that can reduce the wear of the long shaft root.

[0006] According to one aspect of the present invention, a rotary compressor cylinder head structure is provided, which is suitable for a horizontal compressor. The horizontal compressor includes a cylinder head and a long shaft. The cylinder head includes a journal, a through hole is provided in the journal, the long shaft is slidably connected to the journal and is rotatably arranged in the through hole of the journal, a transverse oil hole is provided on the long shaft, and a pressure relief hole is provided on the top of the journal along a direction perpendicular to the axis of the cylinder head. When the long shaft rotates in the through hole of the journal and the transverse oil hole rotates to the position of the pressure relief hole, the transverse oil hole is connected and communicated with the pressure relief hole.

[0007] Preferably, the distance between the transverse oil hole and the end face of the cylinder head is equal to the distance between the pressure relief hole and the end face of the cylinder head, and the end face of the cylinder head is the end face of the cylinder head facing away from the shaft diameter.

[0008] Preferably, an oil suction hole is further provided at the bottom of the journal, and the distance between the oil suction hole and the end surface of the cylinder head is greater than the distance between the pressure relief hole and the end surface of the cylinder head.

[0009] Preferably, the diameter of the pressure relief hole is larger than the diameter of the oil suction hole.

[0010] Preferably, a line connecting the pressure relief hole and the oil suction hole passes through a center line of the journal through hole.

[0011] Preferably, along the ascending direction of rotation of the long axis, the pressure relief hole is located on one side of the ascending direction of the top of the journal.

[0012] Preferably, along the descending direction of rotation of the long axis, the oil suction hole is located on one side of the descending direction of the bottom of the journal.

[0013] Preferably, the pressure relief hole and / or the oil suction hole are cylindrical or conical in shape.

[0014] Preferably, the center line of the pressure relief hole and / or the oil suction hole passes through or does not pass through the center line of the journal through hole.

[0015] According to another aspect of the present invention, there is provided a horizontal compressor, comprising the above-mentioned rotor compressor cylinder head structure.

[0016] The rotary compressor cylinder head structure and the horizontal compressor thereof of the present invention increase the oil film thickness of the crankshaft long axis, reduce the wear of the crankshaft long axis under long-term severe working conditions, and improve the reliability of the compressor pump body. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Other features, objectives and advantages of the present invention will become more apparent from a reading of the detailed description of non-limiting embodiments made with reference to the following accompanying drawings.

[0018] Figure 1 is a structural schematic diagram of a rotary compressor cylinder head structure according to an embodiment of the present invention;

[0019] Figure 2 It is a schematic structural diagram of the hole type of an embodiment of the present invention;

[0020] Figure 3 It is a structural schematic diagram of a hole type in another embodiment of the present invention;

[0021] Figure 4 It is a structural schematic diagram of a hole type in another embodiment of the present invention;

[0022] Figure 5 It is a schematic structural diagram of a hole type in another embodiment of the present invention.

[0023] Reference numerals

[0024] 1 Cylinder head

[0025] 2 Long axis

[0026] 3 Journal

[0027] 4 horizontal oil hole

[0028] 5 Pressure relief hole

[0029] 6 Oil suction hole DETAILED DESCRIPTION

[0030] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present invention will be comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their repeated description will be omitted.

[0031] like Figure 1 As shown in , in an embodiment of the present invention, a rotor compressor cylinder head structure and a horizontal compressor are provided.

[0032] The horizontal compressor comprises a cylinder head 1, a crankshaft, the crankshaft comprising a long shaft 2, and a cylinder (not shown in the figure) and other components.

[0033] The cylinder head 1 is preferably an upper cylinder head connected to the cylinder, comprising a main body and a journal 3. The main body constitutes the main component of the cylinder head 1, and the journal 3 is arranged at the center of the main body, mainly used to carry a part of the crankshaft inserted therein, that is, the long shaft 2.

[0034] A through hole is provided in the journal 3. The long shaft 2 is inserted into the through hole and rotatably arranged in the through hole of the journal 3, and the long shaft 2 is slidably connected with the journal 3.

[0035] A transverse oil hole 4 is provided on the long shaft 2, and the lubricating oil enters between the long shaft 2 and the through hole of the journal 3 through the transverse oil hole 4 to form an oil film.

[0036] A pressure relief hole 5 is provided at the top of the journal 3. The top here means that when the horizontal compressor is installed horizontally, the journal 3 is divided into two parts, upper and lower, in the vertical direction. The upper part is the top, and the lower part is the bottom. The pressure relief hole 5 is connected with the outside and through hole of the journal 3.

[0037] When the long shaft 2 rotates in the through hole of the journal 3, the transverse oil hole 4 also rotates in the through hole. When the transverse oil hole 4 rotates to a certain position, the pressure relief hole 5 on the journal 3 corresponds to the orifice of the transverse oil hole 4, and they are connected and communicated.

[0038] The embodiment of the present invention has been verified through experiments that the reason why the root of the long axis of the crankshaft of the horizontal compressor is generally obvious is that when the crankshaft rotates, gaseous refrigerant and other gases are brought in between the crankshaft and the journal neck of the upper cylinder head, affecting the formation of the lubricating oil film between the crankshaft and the journal neck, resulting in low oil output and severe wear. The embodiment of the present invention opens a pressure relief hole in the journal neck to discharge gaseous refrigerant and other gases between the crankshaft and the journal neck, thereby increasing the thickness of the oil film and reducing wear.

[0039] like Figure 1As shown in, in the embodiment of the present invention, it is preferred that the distance between the horizontal oil hole 4 and the end face of the cylinder head 1 is equal to the distance between the pressure relief hole 5 and the end face of the cylinder head 1. It is also preferred that the distance between the opening of the horizontal oil hole 4 on the major axis 2 and the opening of the pressure relief hole 5 on the through hole and the end face of the cylinder head 1 is equal. Here, the end face of the cylinder head 1 is as shown in FIG. Figure 1 The end face of the upper cylinder cover facing away from the shaft diameter 3 is the end face connected to the cylinder.

[0040] In addition, if Figure 1 As shown in FIG. 1 , in an embodiment of the present invention, preferably, an oil suction hole 6 is further provided at the bottom of the journal 3 to increase the lubricating oil surface.

[0041] Preferably, the distance between the oil suction hole 6 and the end face of the cylinder head 1 is greater than the distance between the pressure relief hole 5 and the end face of the cylinder head 1. Also, preferably, the distance h2 between the opening of the oil suction hole 6 on the through hole and the end face of the cylinder head 1 is greater than the distance h1 between the opening of the pressure relief hole 5 on the through hole and the end face of the cylinder head 1. In this way, the oil film far from the horizontal oil hole 4 can be supplemented without affecting the oil film at the root of the long axis 2 close to the cylinder.

[0042] It is further preferred that the diameter of the pressure relief hole 5 is larger than the diameter of the oil suction hole 6. The diameter here refers to the equivalent diameter.

[0043] like Figure 1 As shown in the figure, when the horizontal compressor of the embodiment of the present invention is in horizontal operation, as the crankshaft rotates, the long shaft 2 rotates, and part of the refrigerant and lubricating oil is discharged through the horizontal oil hole 4 on the long shaft 2. The upward pressure relief hole 5 on the journal 3 is concentric with the horizontal oil hole 4, and the high-pressure gaseous refrigerant can be discharged, which can increase the oil film thickness between the crankshaft and the journal of the upper cylinder head.

[0044] Correspondingly, the downward oil suction hole 6 on the journal 3 is on the low-pressure side. If the machine is refueled more or just started, the oil suction hole 6 is below the oil level and can absorb lubricating oil into the oil film to increase the thickness of the oil film. If the oil level is lower than the oil suction hole 6 as the speed increases or the operation becomes stable, the oil suction hole 6 will not leak oil because the gaseous oil is high temperature and high pressure, and the diameter of the oil suction hole 6 is smaller than the pressure relief hole 5.

[0045] like Figure 2-5 As shown in , in the embodiment of the present invention, along the axial direction of the cylinder head 1, the connecting line of the pressure relief hole 5 and the oil suction hole 6 preferably passes through the center line of the through hole of the journal 3, that is, the positions of the pressure relief hole 5 and the oil suction hole 6 are mirror-symmetrical with respect to the middle surface of the through hole. And the pressure relief hole 5 is preferably located on the top of the journal 3 on the side of the ascending direction in the rotation direction of the long axis 2. The oil suction hole 6 is located on the bottom of the journal 3 on the side of the descending direction in the rotation direction of the long axis 2. In this way, it is more conducive to pressure relief and oil replenishment.

[0046] In addition, if Figure 2-5As shown in, in the embodiment of the present invention, the pressure relief hole 5 / or the oil suction hole 6 is preferably cylindrical or conical or other shapes. The center line of the pressure relief hole 5 / or the oil suction hole 6 passes through or does not pass through the center line of the through hole of the journal 3, and is preferably tiltable.

[0047] In summary, the embodiments of the present invention increase the oil film thickness of the crankshaft long shaft, reduce the wear of the crankshaft long shaft under long-term severe operating conditions, and improve the reliability of the compressor pump body.

[0048] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A rotary compressor cylinder head structure, suitable for a horizontal compressor, the horizontal compressor comprising a cylinder head and a long shaft, characterized in that: The cylinder head includes a journal, a through hole is provided in the journal, the long shaft is slidably connected to the journal and is rotatably arranged in the through hole of the journal, a transverse oil hole is provided on the long shaft, and a pressure relief hole is provided on the top of the journal along a direction perpendicular to the axis of the cylinder head. When the long shaft rotates in the through hole of the journal and the transverse oil hole rotates to the position of the pressure relief hole, the transverse oil hole is connected and communicated with the pressure relief hole.

2. The rotary compressor cylinder head structure according to claim 1, characterized in that: The distance between the transverse oil hole and the end face of the cylinder head is equal to the distance between the pressure relief hole and the end face of the cylinder head, and the end face of the cylinder head is the end face of the cylinder head facing away from the shaft diameter.

3. The rotary compressor cylinder head structure according to claim 2, characterized in that: An oil suction hole is also provided at the bottom of the journal, and the distance between the oil suction hole and the end surface of the cylinder head is greater than the distance between the pressure relief hole and the end surface of the cylinder head.

4. The rotary compressor cylinder head structure according to claim 3, characterized in that: The diameter of the pressure relief hole is larger than the diameter of the oil suction hole.

5. The rotary compressor cylinder head structure according to claim 3, characterized in that: The connecting line between the pressure relief hole and the oil suction hole passes through the center line of the journal through hole.

6. The rotary compressor cylinder head structure according to claim 1, characterized in that: In the ascending direction of rotation along the long axis, the pressure relief hole is located on one side of the ascending direction of the top of the journal.

7. The rotary compressor cylinder head structure according to claim 3, characterized in that: Along the descending direction of the rotation of the long axis, the oil suction hole is located on one side of the descending direction of the bottom of the journal.

8. The rotary compressor cylinder head structure according to claim 3, characterized in that: The pressure relief hole and / or the oil suction hole are in a cylindrical or conical shape.

9. The rotary compressor cylinder head structure according to claim 3, characterized in that: The center line of the pressure relief hole and / or the oil suction hole passes through or does not pass through the center line of the journal through hole.

10. A horizontal compressor, characterized in that: It comprises a rotary compressor cylinder head structure according to any one of claims 1 to 9.

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