Compressor oil supply structure, compressor

Abstract

The application provides a compressor oil supply structure and a compressor, wherein the compressor oil supply structure comprises a bearing assembly, a compression unit and a fixing assembly, the compression unit is connected with the bearing assembly, the fixing assembly has a cavity, the bearing assembly is arranged in the cavity, and an oil supply channel is arranged on the bearing assembly; when the liquid level of lubricating oil in the cavity is higher than a preset liquid level, the lubricating oil can be delivered to the compression unit through the oil supply channel. According to the application, the lubricating oil is stored between the support and the bearing, so that the defect that the bearing cavity cannot store lubricating oil in the prior art is overcome, the lubricating effect of the bearing is improved, and the vibration and noise of the compressor are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of screw compressors, and in particular to a compressor oil supply structure and a compressor. Background Art

[0002] The proper operation of oil-injected screw compressors relies on lubricating oil, which is used primarily for lubrication, sealing, and cooling. In the industry, high energy efficiency is paramount, requiring precise control of the lubricant's circulation volume.

[0003] In the prior art, the lubricating oil in the oil-injected screw compressor first flows into the bearing cavity to lubricate the bearing, and then is sucked into the screw rotor tooth grooves together with the refrigerant through the screw rotor suction port for compression. Since the bearing cavity cannot store lubricating oil, when the compressor is working, the lubricating oil in the bearing cavity will quickly pass through the screw rotor suction port, causing the lubricating oil in the bearing cavity to decrease rapidly, thereby affecting the lubrication effect of the bearing, causing the compressor to vibrate and make loud noises.

[0004] Since the oil-injected screw compressor in the prior art has technical problems such as the inability to store lubricating oil in the bearing cavity, resulting in poor bearing lubrication effect and large compressor vibration, the present invention studies and designs a compressor oil supply structure and a compressor. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defect in the prior art of the oil-injected screw compressor that the lubricating oil cannot be stored in the bearing cavity, resulting in poor bearing lubrication effect, thereby providing a compressor oil supply structure and a compressor.

[0006] In order to solve the above problems, the present invention provides a compressor oil supply structure, which includes:

[0007] A bearing assembly, a compression unit and a fixed assembly, wherein the compression unit is connected to the bearing assembly, the fixed assembly has a cavity, the bearing assembly is arranged in the cavity, and an oil delivery channel is provided on the bearing assembly. When the liquid level of the lubricating oil in the cavity is higher than the preset liquid level, the lubricating oil can be delivered to the compression unit through the oil delivery channel.

[0008] In some embodiments, the bearing assembly includes a first bearing unit, the fixing assembly includes a first bracket, the first bearing unit is arranged on the first bracket, the compression unit is located on one side of the first bracket, and the other side of the first bracket has an air suction cavity, and the lubricating oil between the first bearing unit and the first bracket can be transported to the air suction cavity.

[0009] In some embodiments, the first support is provided with an oil delivery channel, one end of the oil delivery channel is communicated with the compression unit, and the other end of the oil delivery channel is opened on the inner circumferential wall of the first support. When the liquid level of the lubricating oil between the first bearing unit and the first support is higher than a preset liquid level, the first bearing unit is at least partially immersed in the lubricating oil, so that the lubricating oil can generate damping on the first bearing unit, and the lubricating oil can be delivered to the compression unit through the oil delivery channel.

[0010] In some embodiments, the first support is provided with a first seal and a second seal, the first seal is located on the first side of the first bearing unit, the second seal is located on the second side of the first bearing unit, a first bearing chamber is enclosed between the first seal, the first support and the second seal, the first bearing unit is located in the first bearing chamber, and the first seal is provided with an outlet, one end of the outlet is communicated with the suction cavity, and the other end of the outlet is communicated with the first bearing chamber.

[0011] In some embodiments, the first bearing unit includes a third bearing and a fourth bearing, the outlet includes a first outlet and a second outlet, the third bearing is opposite to the first outlet, the second outlet is opposite to the fourth bearing, the outer diameter of the third bearing is D1, the outer diameter of the fourth bearing is D2, the shortest distance between the center of the third bearing and the center of the first outlet is H3, and the shortest distance between the center of the fourth bearing and the center of the second outlet is H4, which satisfies H3≥D1*1 / 6 and H4≥D2*1 / 6.

[0012] In some embodiments, the bearing assembly includes a second bearing unit, the fixing assembly includes a second support, the second bearing unit is arranged on the second support, the compression unit is located on one side of the second support, and the other side of the second support is provided with a cover body. The lubricating oil between the second bearing unit and the second support can be delivered to the compression unit.

[0013] In some embodiments, the second support is provided with a third seal, a second bearing chamber is enclosed between the third seal, the second support and the cover body, the second bearing unit is located in the second bearing chamber, and the second support is provided with a second channel, one end of the second channel is communicated with the compression unit, and the other end of the second channel is communicated with the second bearing chamber.

[0014] In some embodiments, the second bearing unit comprises a first bearing and a second bearing, the second passage comprises a third passage and a fourth passage, the first bearing is opposite to the third passage, the third passage can transport lubricating oil in the compressor to the first bearing, the second bearing is opposite to the fourth passage, and the fourth passage can transport lubricating oil in the compressor to the second bearing.

[0015] In some embodiments, the outer diameter of the first bearing is D3, the outer diameter of the second bearing is D4, the shortest distance between the center of the first bearing and the center line of the third passage is H1, and the shortest distance between the center of the second bearing and the center line of the fourth passage is H2, which satisfy H1≥D3*1 / 6; H2≥D4*1 / 6.

[0016] In some embodiments, the second support is provided with a first passage, the first passage communicates with the second bearing chamber, and oil in the compressor can flow into the second bearing chamber through the first passage.

[0017] The application also provides a compressor comprising the oil supply structure of any one of the preceding.

[0018] The compressor oil supply structure and the compressor provided by the application have the following beneficial effects: the fixed assembly has a cavity, so that lubricating oil can be stored in the cavity, the bearing assembly is provided with an oil supply passage, when the liquid level of the lubricating oil stored in the cavity is higher than a preset liquid level, the oil supply passage can transport the lubricating oil to the compression unit, the oil storage amount in the cavity is ensured, the bearing assembly is soaked in the lubricating oil, when the compressor is running, the high-liquid-level lubricating oil can fully absorb the energy generated by the bearing unit during the running process, a damping effect is generated, so that the energy is not transmitted to the outside through the shell, and thus the vibration and noise of the screw compressor are reduced. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 FIG. 1 is a structural schematic view of the compressor oil supply structure of the embodiment of the application;

[0020] Figure 2 FIG. 2 is a partial enlarged view of the compressor oil supply structure of the embodiment of the application;

[0021] Figure 3 FIG. 3 is a front view of the first bearing unit in the compressor oil supply structure of the embodiment of the application;

[0022] Figure 4 FIG. 4 is a front view of the second bearing unit in the compressor oil supply structure of the embodiment of the application.

[0023] The signs in the drawings represent:

[0024] 1, first seal; 2, first bearing unit; 3, suction chamber; 4, second seal; 5, compression unit; 6, first channel; 7, third seal; 8, second bearing unit; 9, second support; 10, cover; 11, first support; 12, first bearing; 13, second bearing; 14, third bearing; 15, fourth bearing; 16, second channel. DETAILED DESCRIPTION

[0025] In conjunction with Figures 1 to 4 As shown, according to the embodiment of the present application, a compressor oil supply structure is provided, comprising: a bearing assembly, a compression unit 5 connected with the bearing assembly, and a fixing assembly having a cavity therein, the bearing assembly being arranged in the cavity, and an oil supply channel being arranged on the bearing assembly, when the liquid level of lubricating oil in the cavity is higher than a preset liquid level, the lubricating oil can be delivered to the compression unit 5 through the oil supply channel. In this technical solution, the fixing assembly has a cavity therein, so that the lubricating oil can be stored in the cavity, and the oil supply channel can deliver the lubricating oil to the compression unit 5 when the liquid level of the stored lubricating oil in the cavity is higher than the preset liquid level, thereby ensuring the oil storage amount in the cavity and allowing the bearing assembly to be immersed in the lubricating oil. When the compressor is running, the high-liquid-level lubricating oil can fully absorb the energy generated by the bearing unit during operation, thereby producing a damping effect and preventing the energy from being transmitted to the outside through the shell, so as to reduce the vibration and noise of the screw compressor.

[0026] In some embodiments, as shown in Figure 1 The bearing assembly comprises a first bearing unit 2, the fixing assembly comprises a first support 11, the first bearing unit 2 is arranged on the first support 11, the compression unit 5 is located on one side of the first support 11, the other side of the first support 11 has a suction chamber 3, and the lubricating oil between the first bearing unit 2 and the first support 11 can be delivered to the suction chamber 3. In this technical solution, the first bearing unit 2 is arranged on the first support 11, the other side of the first support 11 has a suction chamber 3, and the lubricating oil between the first bearing unit 2 and the first support 11 can be delivered to the suction chamber 3. When the first bearing unit 2 is lubricated by the lubricating oil, the lubricating oil flows into the suction chamber 3 when the liquid level of the lubricating oil is higher than the preset liquid level, and the lubricating oil enters the compression unit along with the refrigerant to lubricate the compression unit.

[0027] In some embodiments, the first support 11 is provided with an oil delivery channel, one end of which is communicated with the compression unit, and the other end is opened on the inner circumferential wall of the first support 11. When the liquid level of the lubricating oil between the first bearing unit 2 and the first support 11 is higher than the preset liquid level, the first bearing unit 2 can be at least partially immersed in the lubricating oil, so that the lubricating oil can generate damping on the first bearing unit 2, and the lubricating oil can be delivered to the compression unit 5 through the oil delivery channel. In this technical solution, the first support 11 is provided with an oil delivery channel, one end of which is communicated with the compression unit, and the other end is opened on the inner circumferential wall of the first support 11, so that the lubricating oil between the first bearing unit 2 and the first support 11 can not occupy the suction volume when circulating, and the suction volume of the compressor is not affected. When the liquid level of the lubricating oil between the first bearing unit 2 and the first support 11 is higher than the preset liquid level, the first bearing unit 2 can be at least partially immersed in the lubricating oil, so that the lubricating oil can generate damping on the first bearing unit 2. The lubricating oil can fully absorb the energy generated by the rolling bearing during operation, so that it will not be transmitted to the outside through the shell, thereby reducing the noise and vibration of the screw compressor. Through experiments, the noise of a 100m3 / h screw refrigeration compressor can be reduced by 2-3dB, and the vibration can be reduced by 3-4dB. The oil injection screw compressor supplies lubricating oil to the suction and discharge bearing cavities through pressure difference or oil pump.

[0028] In some embodiments, the first support 11 is provided with a first seal 1 and a second seal 4, the first seal 1 is located on the first side of the first bearing unit 2, the second seal 4 is located on the second side of the first bearing unit 2, a first bearing chamber is enclosed between the first seal 1, the first support 11 and the second seal 4, the first bearing unit 2 is located in the first bearing chamber, the first seal 1 is provided with an outlet, one end of the outlet is communicated with the suction chamber 3, and the other end is communicated with the first bearing chamber. In this technical solution, a first bearing chamber is enclosed between the first seal 1, the first support 11 and the second seal 4, the first support 11 is provided with an oil inlet channel to allow the lubricating oil in the compressor set to enter the first bearing chamber, the first seal 1 is provided with an outlet, one end of the outlet is communicated with the suction chamber 3, and the other end is communicated with the first bearing chamber. Specifically, the first support 11 is provided with a mounting hole, one end of the mounting hole is communicated with the suction chamber, and the other end is communicated with the compression unit, the first bearing unit 2 is located in the mounting hole, the first seal 1 and the second seal 4 are arranged in the mounting hole, preferably, the first seal 1, the second seal 4 and the mounting hole are in interference fit, so that the first seal 1 and the second seal 4 are located on both sides of the first bearing unit 2, that is, the first bearing unit 2 is located between the first seal 1 and the second seal 4, thereby enclosing a first bearing chamber between the first seal 1, the second seal 4 and the inner wall of the mounting hole, and the first bearing unit 2 is located in the first bearing chamber. An oil inlet channel is arranged on the first support 11, one end of the oil inlet channel is communicated with the oil pool of the compressor set, and the lubricating oil in the oil pool is delivered to the first bearing chamber through the oil inlet channel, thereby infiltrating the first bearing unit 2. Of course, an external oil pump can be arranged on the oil inlet channel to ensure the oil supply efficiency. When the liquid level of the lubricating oil in the first bearing chamber is higher than the preset liquid level, the lubricating oil flows into the suction chamber 3 through the outlet. The outlet is arranged on the first seal 1, one end of the outlet is communicated with the suction chamber 3, and the other end is communicated with the first bearing chamber. By arranging the position of the outlet, that is, the outer diameter of the bearing is d, the shortest distance between the center of the outlet and the center of the bearing is h, which satisfies h≥d*1 / 6, thereby ensuring the liquid level height in the first bearing chamber, improving the infiltration height of the bearing, and ensuring that there is sufficient lubricating oil in the first bearing chamber, so that the first bearing unit 2 is immersed in the lubricating oil. During the operation of the compressor, the high liquid level lubricating oil can fully absorb the energy generated by the first bearing unit 2 during operation, produce a damping effect, so that it will not be transmitted to the outside through the shell, thereby reducing the noise and vibration of the screw compressor.In the prior art, part of the refrigerant in the suction chamber 3 is transported into the compression unit through the mounting hole, and another part enters the compression unit through the gas inlet passage on the first bracket 11. Of course, the suction chamber 3 can also use external pipelines to transport the refrigerant in the suction chamber 3 to the compression unit. In the present application, since the first sealing member 1, the second sealing member 4, and the inner wall of the mounting hole enclose the first bearing chamber, when the lubricating oil is discharged from the outlet into the suction chamber 3, the refrigerant carrying the lubricating oil can only enter the compression unit through the gas inlet passage of the first bracket 11 to lubricate the compression unit. In addition, due to the sealing function of the lubricating oil itself, the lubricating oil in the suction and discharge side bearing chambers will not flow to the compression tooth grooves on both sides of the screw rotor.

[0029] In some embodiments, referring to Figure 3 As shown in the drawings, the first bearing unit 2 includes a third bearing 14 and a fourth bearing 15, the outlet includes a first outlet and a second outlet, the third bearing 14 is opposite to the first outlet, the second outlet is opposite to the fourth bearing 15, the outer diameter of the third bearing 14 is D1, the outer diameter of the fourth bearing 15 is D2, the shortest distance between the center of the third bearing 14 and the center of the first outlet is H3, and the shortest distance between the center of the fourth bearing 15 and the center of the second outlet is H4, which satisfies H3≥D1*1 / 6 and H4≥D2*1 / 6. In this technical solution, the outer diameter of the third bearing 14 is D1, the outer diameter of the fourth bearing 15 is D2, the shortest distance between the center of the third bearing 14 and the center of the first outlet is H3, and the shortest distance between the center of the fourth bearing 15 and the center of the first outlet is H4, which satisfies H3≥D1*1 / 6 and H4≥D2*1 / 6. The oil storage capacity in the first bearing chamber is ensured, so that the lubricating oil can generate damping on the third bearing 14 and the fourth bearing 15. Of course, oil channels can also be arranged on the first outlet and the second outlet, i.e., internal oil channels or external pipelines are arranged to directly guide the first bearing chamber to the first closed tooth groove of the screw rotor, without occupying the suction volume, and the suction volume of the compressor is not affected. The third bearing 14 and the fourth bearing 15 can correspond to the first sealing member 1 and the second sealing member 4, respectively.

[0030] In some embodiments, the bearing assembly includes a second bearing unit 8, the fixing assembly includes a second bracket 9, the second bearing unit 8 is arranged on the second bracket 9, the compression unit 5 is located on one side of the second bracket 9, and a cover body 10 is arranged on the other side of the second bracket 9. The lubricating oil between the second bearing unit 8 and the second bracket 9 can be transported into the compression unit 5.

[0031] Technical effects, the compression unit 5 is located on one side of the second support 9, the other side of the second support 9 is provided with a cover 10, and the lubricating oil between the second bearing unit 8 and the second support 9 can be transported into the compression unit 5. When the lubricating oil lubricates the second bearing unit 8, the lubricating oil level is higher than the preset level, and the lubricating oil flows into the compression unit 5 to lubricate the compression unit 5.

[0032] In some embodiments, the second support 9 is provided with a third seal 7, a second bearing chamber is enclosed between the third seal 7, the second support 9 and the cover 10, the second bearing unit 8 is located in the second bearing chamber, and the second support 9 is provided with a second channel 16, one end of the second channel 16 is communicated with the compression unit 5, and the other end is communicated with the second bearing chamber.

[0033] Technical effects, the third seal 7, the second support 9 and the cover 10 enclose a second bearing chamber, the second support 9 is provided with a second channel 16, one end of the second channel 16 is communicated with the compression unit 5, and the other end is communicated with the second bearing chamber. When the lubricating oil level in the second bearing chamber is higher than the preset level, the lubricating oil flows into the compression unit 5 through the second channel 16 to lubricate the compression unit.

[0034] In some embodiments, referring to Figure 2 As shown, the second bearing unit 8 includes a first bearing 12 and a second bearing 13, the second channel 16 includes a third channel and a fourth channel, the first bearing 12 is opposite to the third channel, the third channel can transport the lubricating oil in the compressor to the first bearing 12, and the second bearing 13 is opposite to the fourth channel, and the fourth channel can transport the lubricating oil in the compressor to the second bearing 13. In this technical solution, the lubricating oil in the compressor group lubricates the first bearing 12 through the third channel and lubricates the second bearing 13 through the fourth channel, so as to improve the lubricating effect of the first bearing 12 and the second bearing 13, ensure the oil storage capacity in the second bearing chamber, improve the damping effect of the lubricating oil on the first bearing 12 and the second bearing 13, and reduce the vibration of the compressor.

[0035] In some embodiments, referring to Figure 4As shown, the outer diameter of the first bearing 12 is D3, the outer diameter of the second bearing 13 is D4, the shortest distance between the center of the first bearing 12 and the center line of the third channel is H1, and the shortest distance between the center of the second bearing 13 and the center line of the fourth channel is H2, which satisfies H1≥D3*1 / 6; H2≥D4*1 / 6. In the technical solution, the shortest distance between the center of the first bearing 12 and the center line of the third channel is H1, and the shortest distance between the center of the second bearing 13 and the center line of the fourth channel is H2, which satisfies H3≥D1*1 / 6, H4≥D2*1 / 6. The oil storage capacity in the second bearing chamber is ensured, so that the lubricating oil can dampen the first bearing 12 and the second bearing 13. Of course, oil channels are also arranged on the first outlet and the second outlet, that is, oil channels or external pipelines are arranged on the shell, and the first closed tooth groove in the first bearing chamber is directly guided to the screw rotor, without occupying the suction volume, and the suction volume of the compressor is not affected. The first bearing 12 and the second bearing 13 can correspond to the third sealing element 7 respectively.

[0036] In some embodiments, the second bracket 9 is provided with a first channel 6, which communicates with the second bearing chamber, and oil in the compressor can flow into the second bearing chamber through the first channel 6. In the technical solution, the first channel 6 communicates with the second bearing chamber, and oil in the compressor can flow into the second bearing chamber through the first channel 6. The lubricating oil in the compressor unit directly flows into the second bearing chamber through the first channel 6, lubricates the second bearing unit 8, and produces a damping effect, thereby reducing the vibration and noise of the compressor.

[0037] The application also provides a compressor comprising the above-mentioned compressor oil supply structure.

[0038] The above only describes the preferred embodiments of the present application and should not be used to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application. The above only describes the preferred embodiments of the present application, and it should be pointed out that, for ordinary skilled in the art, without departing from the technical principles of the present application, a number of improvements and modifications can be made, and these improvements and modifications should be regarded as the protection scope of the present application.

Claims

1. A compressor oil supply structure characterized by comprising: The application relates to a bearing assembly, a compression unit (5) connected with the bearing assembly and a fixing assembly with a cavity, wherein the bearing assembly is arranged in the cavity, and an oil conveying channel is arranged on the bearing assembly, so that when the liquid level of lubricating oil in the cavity is higher than a preset liquid level, the lubricating oil can be conveyed into the compression unit (5) through the oil conveying channel. The bearing assembly comprises a first bearing unit (2), the fixing assembly comprises a first support (11), the first bearing unit (2) is arranged on the first support (11), the compression unit (5) is located on one side of the first support (11), the first support (11) has an air suction cavity (3) on the other side, and the lubricating oil between the first bearing unit (2) and the first support (11) can be conveyed into the air suction cavity (3). An oil conveying channel is arranged on the first support (11), one end of the oil conveying channel is communicated with the compression unit, and the other end of the oil conveying channel is arranged on the inner circumferential wall of the first support (11), so that when the liquid level of the lubricating oil between the first bearing unit (2) and the first support (11) is higher than the preset liquid level, the first bearing unit (2) can be at least partially immersed in the lubricating oil, so that the lubricating oil can generate damping on the first bearing unit (2), and the lubricating oil can be conveyed into the compression unit (5) through the oil conveying channel. First and second sealing members (1) and (4) are arranged on the first support (11), the first sealing member (1) is located on the first side of the first bearing unit (2), the second sealing member (4) is located on the second side of the first bearing unit (2), a first bearing chamber is enclosed between the first sealing member (1), the first support (11) and the second sealing member (4), the first bearing unit (2) is located in the first bearing chamber, and an outlet is arranged on the first sealing member (1), one end of the outlet is communicated with the air suction cavity (3), and the other end of the outlet is communicated with the first bearing chamber. The first bearing unit (2) comprises third and fourth bearings (14) and (15), the outlet comprises first and second outlets, the third bearing (14) is opposite to the first outlet, the second outlet is opposite to the fourth bearing (15), the outer diameter of the third bearing (14) is D1, the outer diameter of the fourth bearing (15) is D2, the shortest distance between the center of the third bearing (14) and the center of the first outlet is H3, and the shortest distance between the center of the fourth bearing (15) and the center of the second outlet is H4, and H3>=D1*1 / 6 and H4>=D2*1 / 6 are met.

2. The oil supply structure of the compressor according to claim 1, characterized by: ​ 3. The oil supply structure for a compressor according to claim 1, characterized by: The bearing assembly comprises a second bearing unit (8), the fixing assembly comprises a second support (9), the second bearing unit (8) is arranged on the second support (9), the compression unit (5) is located on one side of the second support (9), and the other side of the second support (9) is provided with a cover body (10); lubricating oil between the second bearing unit (8) and the second support (9) can be transported into the compression unit (5).

4. The oil supply structure of the compressor according to claim 3, characterized by: The third sealing piece (7) is arranged on the second support (9), a second bearing chamber is enclosed between the third sealing piece (7), the second support (9) and the cover body (10), the second bearing unit (8) is located in the second bearing chamber, the second support (9) is provided with a second channel (16), one end of the second channel (16) is communicated with the compression unit (5), and the other end of the second channel (16) is communicated with the second bearing chamber.

5. The oil supply structure for a compressor according to claim 4, characterized by: The second bearing unit (8) comprises a first bearing (12) and a second bearing (13), the second channel (16) comprises a third channel and a fourth channel, the first bearing (12) is opposite to the third channel, lubricating oil in the compressor can be transported to the first bearing (12) through the third channel, and the second bearing (13) is opposite to the fourth channel.

6. The oil supply structure for a compressor according to claim 5, characterized by: The outer diameter of the first bearing (12) is D3, the outer diameter of the second bearing (13) is D4, the shortest distance between the center of the first bearing (12) and the center line of the third channel is H1, the shortest distance between the center of the second bearing (13) and the center line of the fourth channel is H2, and H1≥D3*1 / 6 and H2≥D4*1 / 6 are met.

7. The oil supply structure for a compressor according to claim 4, characterized by: The first channel (6) is arranged on the second support (9), the first channel (6) is communicated with the second bearing chamber, and oil in the compressor can flow into the second bearing chamber through the first channel (6).

8. A compressor characterized by: The oil supply structure of the compressor comprises the oil supply structure of the compressor. The oil supply structure of the compressor comprises the oil supply structure of the compressor.

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