An oil balancing structure for parallel scroll compressors

Abstract

The utility model discloses an oil-balancing structure for parallel scroll compressors, including a shell, an upper cover is provided at the upper end of the shell, a lower cover is provided at the lower end of the shell, the shell, the upper cover and the lower cover enclose a closed inner cavity, a scroll pump assembly is provided at the upper position in the shell, the scroll pump assembly includes a movable scroll and a fixed scroll arranged in cooperation with each other, a scroll pump suction port is provided on the scroll pump assembly, an oil level regulating pipe is provided between the bottom of the closed inner cavity and the scroll pump suction port, the lower end of the oil level regulating pipe is set at the standard design oil level of the lubricating oil, and the upper end of the oil level regulating pipe is close to the scroll pump suction port. The utility model can be used in a parallel state of the compressors. When there is too much lubricating oil inside a compressor, the lubricating oil will be transported to the suction port of the scroll pump assembly through the oil level control pipe under pressure, and discharged from the compressor through the scroll pump assembly, so that the amount of lubricating oil inside the compressor can be controlled.

Description

Technical Field

[0001] The utility model relates to an oil balancing structure for parallel scroll compressors, belonging to the technical field of oil balancing structures for parallel scroll compressors. Background Art

[0002] In the household air conditioners and small household central air conditioning units currently on the market, multi-compressor parallel operation technology has been widely used. The compression capacity can be significantly improved by connecting compressors in parallel. At the same time, after connecting multiple compressors in parallel in the unit, capacity adjustment can be achieved, the starting load can be reduced, and reliability can be improved.

[0003] The most important issue to be solved when using compressors in parallel is how to ensure the even distribution of lubricating oil in the two compressors. For compressors with internal low-pressure structures, the current conventional parallel compressors use an oil equalizing pipe to connect the oil pools of the two compressors, and use the connecting vessel principle to make the oil levels in the two compressors equal. This method has the following defects:

[0004] 1. Compressors of different displacements cannot be used in parallel. If compressors of different displacements run at the same time, it will lead to inconsistent pressure inside the compressors, which will cause more lubricating oil in the compressor with larger displacement and less lubricating oil in the compressor with smaller displacement, and even cause the compressor with smaller displacement to be damaged due to lack of oil.

[0005] 2. Even if the compressor displacement is the same, due to individual differences in the compressors, there will be differences in suction pressure, which will lead to more lubricating oil in one compressor and less lubricating oil in the other compressor, causing oil shortage and damage after long-term operation.

[0006] 3. It is difficult to use multiple compressors in parallel. Usually, there is only one oil equalization interface on each compressor, which makes it difficult to use multiple compressors in parallel.

[0007] 4. In order to achieve parallel reliability, it is usually necessary to add oil level monitors and oil separation and return oil controls, which significantly increases the cost of the unit.

[0008] In summary, the prior art obviously has inconveniences and defects in practical use, so it is necessary to improve it. Utility Model Content

[0009] In view of the deficiencies in the background technology, the utility model provides an oil equalizing structure for parallel scroll compressors. When the compressors are in parallel, if there is too much lubricating oil in one of the compressors, the lubricating oil will be transported to the suction port of the scroll pump assembly through the oil level control pipe under the action of pressure, and discharged from the compressor through the scroll pump assembly, so that the amount of lubricating oil in the compressor can be controlled.

[0010] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0011] An oil-balancing structure for parallel scroll compressors comprises a shell, an upper cover is provided at the upper end of the shell, a lower cover is provided at the lower end of the shell, the shell, the upper cover and the lower cover form a closed inner cavity, a scroll pump assembly is provided at the upper position in the shell, the scroll pump assembly comprises a movable scroll and a fixed scroll which are arranged in cooperation with each other, a scroll pump suction port is provided on the scroll pump assembly, an oil level regulating tube is provided between the bottom of the closed inner cavity and the scroll pump suction port, the lower end of the oil level regulating tube is arranged at the standard design oil level of the lubricating oil, and the upper end of the oil level regulating tube is close to the scroll pump suction port.

[0012] Furthermore, a high- and low-pressure partition is fixedly provided on the upper side of the fixed scroll, and the high- and low-pressure partition divides the closed inner cavity into an upper high-pressure cavity and a lower low-pressure cavity.

[0013] Furthermore, the oil level regulating tube is located in the low-pressure chamber of the closed inner cavity.

[0014] Furthermore, the oil level regulating tube is a first oil level regulating tube arranged in the low-pressure chamber, the first oil level regulating tube is close to the side wall of the shell, the lower end of the first oil level regulating tube is flush with the standard design oil level of the lubricating oil, and the upper end is arranged close to the suction port of the vortex pump.

[0015] Furthermore, the oil level regulating tube is a second oil level regulating tube arranged on the outside of the shell, the lower end of the second oil level regulating tube penetrates into the shell from the outside and is flush with the standard design oil level of the lubricating oil, and the upper end penetrates into the shell from the outside and is arranged close to the suction port of the vortex pump.

[0016] Furthermore, an air intake pipe is provided on the side wall of the shell located at the low-pressure chamber position, and an air exhaust pipe is provided on the side wall of the shell located at the high-pressure chamber position.

[0017] Compared with the prior art, the utility model has the following advantages after adopting the above technical solution:

[0018] 1. When multiple compressors are connected in parallel, if there is too much lubricating oil inside one of the compressors, the lubricating oil will be transported to the suction port of the vortex pump assembly through the oil level control pipe under pressure, and then discharged from the compressor through the vortex pump assembly, so that the amount of lubricating oil inside the compressor can be controlled.

[0019] 2. Since the lubricating oil quantity control method is adjusted by the compressor itself, this solution can realize multiple compressors in parallel without being restricted by displacement differences, and no other auxiliary settings are required between compressors, simplifying the parallel implementation method of the units.

[0020] 3. The utility model makes the maximum oil level controllable, thus avoiding the problem of power increase caused by the rotor counterweight stirring the oil.

[0021] The utility model is described in detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the internal structure of one embodiment of the utility model;

[0023] Figure 2 yes Figure 1 Sectional view along BB;

[0024] Figure 3 It is a schematic diagram of the internal structure of another embodiment of the utility model.

[0025] In the figure,

[0026] 1-exhaust pipe, 2-high and low pressure partitions, 3-vortex pump suction port, 4-first oil level regulating pipe, 5-suction pipe, 6-housing, 7-motor stator 8-driving crankshaft, 9-lower cover, 10-auxiliary bearing support, 11-main bearing support, 12-moving scroll, 13-cross ring, 14-fixed scroll, 15-upper cover, 16-high pressure chamber, 17-low pressure chamber, 18-second oil level regulating pipe. DETAILED DESCRIPTION

[0027] In order to have a clearer understanding of the technical features, purposes and effects of the utility model, the specific implementation methods of the utility model are now described with reference to the accompanying drawings.

[0028] like Figure 1-3 As shown, the utility model provides an oil-balancing structure for a parallel scroll compressor, comprising a shell 6, an upper cover 15 is provided at the upper end of the shell 6, a lower cover 9 is provided at the lower end of the shell 6, the shell 6, the upper cover 15 and the lower cover 9 form a closed inner cavity, a vortex pump assembly is provided at the upper position in the shell 6, the vortex pump assembly comprises a movable scroll 12 and a fixed scroll 14 which are arranged in cooperation with each other, a compression chamber is formed between the movable scroll 12 and the fixed scroll 14, the movable scroll 12 performs a circular translation motion around the center of the fixed scroll 14, and a cross ring 13 is also provided between the movable scroll 12 and the fixed scroll 14 to prevent the movable scroll 12 and the fixed scroll 14 from rotating relative to each other.

[0029] A high- and low-pressure partition plate 2 is fixedly provided on the upper side of the fixed scroll 14 , and the high- and low-pressure partition plate 2 divides the closed inner cavity into an upper high-pressure chamber 16 and a lower low-pressure chamber 17 .

[0030] An air intake pipe 5 is provided on the side wall of the housing 6 at the position of the low-pressure chamber 17, and an exhaust pipe 1 is provided on the side wall of the housing 6 at the position of the high-pressure chamber 16. The low-pressure chamber 17 inhales gas through the air intake pipe 5. The vortex pump assembly is provided with a vortex pump air intake port 3. The vortex pump air intake port 3 inhales air, which is compressed by the vortex pump assembly and discharged into the high-pressure chamber 16, and then discharged from the body through the exhaust pipe 1. The lubricating oil is deposited at the bottom of the closed inner cavity, and an oil level regulating pipe is provided between the bottom of the closed inner cavity and the vortex pump air intake port 3. The lower end of the oil level regulating pipe is set at the standard design oil level of the lubricating oil, and the upper end of the oil level regulating pipe is close to the vortex pump air intake port 3.

[0031] The vortex pump suction port 3 of the vortex pump assembly is the lowest pressure point in the low-pressure chamber 17. When the oil level in the compressor is higher than the lower end of the oil level regulating tube, the lower outlet of the oil level regulating tube is immersed below the oil level. Under the action of pressure, the lubricating oil will be transported to the vortex pump suction port 3 along the oil level regulating tube, and discharged from the compressor along with the gas through the vortex pump assembly, thereby ensuring that the oil level inside the compressor is constant. Since the total amount of lubricating oil injected into all compressors is certain when multiple compressors are connected in parallel, as long as the oil level in each compressor does not exceed the standard design oil level, it can be ensured that there is no lack of lubricating oil in each compressor, thereby realizing the adaptive distribution of lubricating oil in parallel compressors.

[0032] The oil level regulating tube is a first oil level regulating tube 4 arranged in the low-pressure chamber 17. The first oil level regulating tube 4 is close to the side wall of the shell 6. The lower end of the first oil level regulating tube 4 is flush with the standard design oil level of the lubricating oil, and the upper end is arranged close to the vortex pump suction port 3.

[0033] In another embodiment, if Figure 3 The oil level regulating tube is a second oil level regulating tube 18 arranged on the outside of the shell 6. The lower end of the second oil level regulating tube 18 penetrates into the shell 6 from the outside and is flush with the standard design oil level of the lubricating oil, and the upper end penetrates into the shell from the outside and is arranged close to the vortex pump suction port 3.

[0034] The specific working principle of the utility model:

[0035] A driving crankshaft 8, a motor stator 7 and a vortex pump assembly are provided inside the low-pressure chamber 17. A driving crankshaft 8 is provided at the central axis position of the low-pressure chamber 17. A main bearing support 11 and a secondary bearing support 10 are provided at the upper and lower ends of the driving crankshaft 8, respectively. A motor stator 7 is provided on the outer side of the driving crankshaft 8. The top of the driving crankshaft 8 is connected to the vortex pump assembly, and the driving crankshaft 8 drives the turbine pump assembly to work.

[0036] A certain amount of lubricating oil is deposited at the bottom of the low-pressure chamber 17, and the lubricating oil lubricates the drive crankshaft 8, the motor stator 7 and the vortex pump assembly and other components in the low-pressure chamber. Under normal circumstances, the oil level of the lubricating oil is close to the standard design oil level. By setting an oil level regulating tube, its lower end is flush with the standard design oil level of the lubricating oil, and the upper end is set close to the suction port 3 of the vortex pump.

[0037] When multiple compressors are connected in parallel, if there is too much lubricating oil in one of the compressors, the lubricating oil will be transported to the suction port of the vortex pump assembly through the oil level control pipe under the action of pressure, and discharged from the compressor through the vortex pump assembly, so that the amount of lubricating oil in the compressor can be controlled; moreover, since the lubricating oil amount control method is an adjustment made by the compressor itself, this solution can realize multiple compressors in parallel without being restricted by the displacement difference, and no other auxiliary settings are required between the compressors, thereby simplifying the implementation method of parallel connection of the units; in addition, the utility model makes the maximum oil level controllable, avoiding the problem of power increase caused by the rotor counterweight stirring the oil.

[0038] The above is an example of the best implementation of the utility model, and the parts not described in detail are common knowledge of ordinary technicians in this field. The protection scope of the utility model is based on the content of the claims, and any equivalent transformation based on the technical inspiration of the utility model is also within the protection scope of the utility model.

Claims

1. An oil balancing structure for a parallel scroll compressor, comprising a housing (6), an upper cover (15) being provided at the upper end of the housing (6), a lower cover (9) being provided at the lower end of the housing (6), the housing (6), the upper cover (15) and the lower cover (9) forming a closed inner cavity, a scroll pump assembly being provided at an upper position in the housing (6), the scroll pump assembly comprising a movable scroll (12) and a fixed scroll (14) being arranged in cooperation with each other, characterized in that: A vortex pump air intake port (3) is provided on the vortex pump assembly, and an oil level regulating tube is provided between the bottom of the closed inner cavity and the vortex pump air intake port (3), wherein the lower end of the oil level regulating tube is arranged at a standard design oil level of the lubricating oil, and the upper end of the oil level regulating tube is close to the vortex pump air intake port (3).

2. The oil balancing structure for parallel scroll compressors according to claim 1, characterized in that: A high- and low-pressure partition (2) is fixedly provided on the upper side of the fixed scroll (14), and the high- and low-pressure partition (2) divides the closed inner cavity into an upper high-pressure cavity (16) and a lower low-pressure cavity (17).

3. The oil balancing structure for parallel scroll compressors according to claim 2, characterized in that: The oil level regulating tube is located in the low-pressure chamber (17) of the closed inner cavity.

4. The oil balancing structure for parallel scroll compressors according to claim 3, characterized in that: The oil level regulating tube is a first oil level regulating tube (4) arranged in the low-pressure chamber (17). The first oil level regulating tube (4) is close to the side wall of the shell (6). The lower end of the first oil level regulating tube (4) is flush with the standard design oil level of the lubricating oil, and the upper end is arranged close to the vortex pump suction port (3).

5. The oil balancing structure for parallel scroll compressors according to claim 3, characterized in that: The oil level regulating tube is a second oil level regulating tube (18) arranged outside the housing (6); the lower end of the second oil level regulating tube (18) penetrates into the housing (6) from the outside and is flush with the standard design oil level of the lubricating oil; the upper end penetrates into the housing from the outside and is arranged close to the air intake port (3) of the vortex pump.

6. An oil balancing structure for parallel scroll compressors according to claim 4 or 5, characterized in that: An air intake pipe (5) is provided on the side wall of the shell (6) located at the low-pressure chamber (17), and an air discharge pipe (1) is provided on the side wall of the shell (6) located at the high-pressure chamber (16).

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