Vortex compressor with pressure relief structure

Abstract

The utility model discloses a vortex compressor with a pressure relief structure, which comprises a shell, an upper cover is arranged at the upper end of the shell, a lower cover is arranged at the lower end of the shell, a movable vortex and a fixed vortex which are matched with each other are arranged at the upper position in the shell, a compression cavity is formed between the movable vortex and the fixed vortex, and a high-low pressure partition plate is fixedly arranged on the upper side of the fixed vortex. A back pressure cavity is formed between the high-low pressure partition plate and the fixed vortex, a back pressure hole is formed in the fixed vortex so that the back pressure cavity can be communicated with the compression cavity, and an unloading hole is formed in the high-low pressure partition plate so that the back pressure cavity can be communicated with the exhaust cavity. Under the condition that the backpressure area is not influenced, a pressure ratio self-adaptive structure is added, so that the pressure ratio of the cavity of the compressor is adjustable, and the power consumption of the compressor caused by over-compression is reduced.

Description

Technical Field

[0001] The utility model relates to a vortex compressor with a pressure relief structure, belonging to the technical field of vortex compressors. Background Art

[0002] Scroll compressors are becoming popular as compressors for refrigeration cycles of air conditioners and heating pump water heaters. Scroll compressors include a fixed scroll and a movable scroll. The fixed scroll and the movable scroll engage to rotate, and a compression chamber is formed between the fixed scroll and the movable scroll. A suitable closed cavity is constructed on the back of the fixed scroll, which is called a back pressure chamber. The current technology has the following shortcomings:

[0003] The scroll compressor is a constant volume ratio compressor. In order to better adapt to different pressure ratio conditions, the commonly used solution is to add an early exhaust structure. However, the back pressure cavity area of ​​the current fixed scroll axial flexible structure is large, which occupies the position of the early exhaust structure, making it difficult to install the early exhaust structure.

[0004] In summary, the prior art obviously has inconveniences and defects in practical use, so it is necessary to improve it. Utility Model Content

[0005] In view of the deficiencies in the background technology, the utility model provides a vortex compressor with a pressure relief structure, which can increase the pressure ratio adaptive structure without affecting the back pressure area, so as to achieve adjustable pressure ratio of the compressor chamber and reduce the power consumption of the compressor due to over-compression.

[0006] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0007] A vortex compressor with a pressure relief structure includes 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, a movable scroll and a fixed scroll are provided in cooperation with each other at the upper position in the shell, a compression chamber is formed between the movable scroll and the fixed scroll, a high-low pressure partition is fixedly provided on the upper side of the fixed scroll, a back-pressure chamber is formed between the high-low pressure partition and the fixed scroll, a back-pressure hole is provided on the fixed scroll to connect the back-pressure chamber with the compression chamber, and an unloading hole is provided on the high-low pressure partition to connect the back-pressure chamber with the exhaust chamber.

[0008] Furthermore, a second valve plate is provided on one side of the unloading hole located in the exhaust cavity.

[0009] Furthermore, a valve plate limiting plate is provided on the back side of the high and low pressure partition, and the second valve plate is fixed on the valve plate limiting plate, so that the gas can only enter the exhaust chamber from the back pressure chamber but cannot flow back.

[0010] Furthermore, a first valve plate is provided on one side of the back pressure hole located in the back pressure cavity.

[0011] Furthermore, a valve plate limiting plate is provided on one side of the fixed scroll located in the back pressure chamber, and the first valve plate is fixed on the valve plate limiting plate, so that the gas can only enter the back pressure chamber from the compression chamber but cannot flow back.

[0012] Furthermore, a plurality of back-pressure holes may be provided, and each back-pressure hole is provided with a first valve plate.

[0013] Furthermore, a plurality of unloading holes may be provided, and each unloading hole is provided with a second valve plate.

[0014] Furthermore, a first sealing ring and a second sealing ring are installed between the high- and low-pressure partitions and the fixed scroll.

[0015] Compared with the prior art, the utility model has the following advantages after adopting the above technical solution:

[0016] 1. When the compressor is in an over-compression state, that is, when the pressure in the scroll compression chamber is higher than the pressure in the exhaust chamber, the gas will first enter the back pressure chamber through the back pressure hole, then enter the exhaust chamber through the unloading hole, and then be discharged from the compressor through the exhaust pipe, thereby avoiding the pressure in the compression chamber from continuing to rise, achieving the effect of adjusting the internal pressure ratio and reducing the power consumption of the compressor due to over-compression;

[0017] 2. When the pressure in the compression chamber is higher than the pressure in the back pressure chamber, the first valve plate opens and the gas enters the back pressure chamber. When the pressure in the compression chamber is lower than the pressure in the back pressure chamber, the first valve plate closes to prevent the gas from flowing back and avoid gas leakage from the back pressure chamber to the compression chamber, thereby achieving the purpose of reducing repeated compression and increasing power consumption;

[0018] 3. The first unidirectional valve plate is arranged on the back pressure hole to stabilize the pressure in the back pressure chamber, which can ensure that under the minimum back pressure, the fixed scroll can also press the movable scroll, reduce the maximum pressure in the back pressure chamber, thereby reducing the contact force between the movable scroll and the fixed scroll, reducing wear and further reducing power consumption.

[0019] The utility model is described in detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the utility model;

[0021] Figure 2 It is a partial enlarged view of the utility model.

[0022] In the figure,

[0023] 1-exhaust pipe, 2-high and low pressure partitions, 3-first sealing ring, 4-second sealing ring, 5-fixed scroll, 6-moving scroll, 7-back pressure chamber, 8-intake pipe, 9-main bearing support, 10-housing, 11-drive crankshaft, 12-drive motor, 13-auxiliary bearing support, 14-lower cover, 15-intake chamber, 16-fixing ring, 17-exhaust chamber, 18-first valve plate, 19-valve plate limit plate, 20-upper cover, 21-unloading hole, 22-second valve plate, 23-back pressure hole. DETAILED DESCRIPTION

[0024] In order to have a clearer understanding of the technical features, purposes and effects of the present utility model, the specific implementation methods of the present utility model are now described with reference to the accompanying drawings.

[0025] like Figure 1-2 As shown, the utility model provides a vortex compressor with a pressure relief structure, including a shell 10, an upper cover 20 is provided at the upper end of the shell 10, a lower cover 14 is provided at the lower end of the shell 10, and a movable scroll 6 and a fixed scroll 5 are cooperated with each other at the upper position inside the shell 10, and a compression chamber is formed between the movable scroll 6 and the fixed scroll 5.

[0026] A high-low pressure partition plate 2 is fixedly provided on the upper side of the fixed scroll 5, a back pressure chamber 7 is formed between the high-low pressure partition plate 2 and the fixed scroll 5, an exhaust chamber 17 is formed between the high-low pressure partition plate 2 and the upper cover 20, a back pressure hole 23 is provided on the fixed scroll 5, so that the back pressure chamber 7 is connected to the compression chamber, and an unloading hole 21 is provided on the high-low pressure partition plate 2, so that the back pressure chamber 7 is connected to the exhaust chamber 17. When the internal pressure of the back pressure chamber 7 is higher than the pressure of the exhaust chamber 17, the gas is discharged into the exhaust chamber 17 through the unloading hole 21.

[0027] A first sealing ring 3 and a second sealing ring 4 are installed between the high-low pressure partition plate 2 and the fixed scroll 5 to increase the sealing effect of the back pressure chamber 7.

[0028] During the operation of the scroll compressor, when the compressor is in an over-compression state, that is, when the pressure in the scroll compression chamber is higher than the pressure in the exhaust chamber, the gas will first enter the back pressure chamber 7 through the back pressure hole 23, and then enter the exhaust chamber 17 through the unloading hole 21, and then be discharged from the compressor through the exhaust pipe 1, thereby avoiding the pressure in the compression chamber from continuing to increase, achieving the effect of adjusting the internal pressure ratio, and reducing the power consumption of the compressor due to over-compression.

[0029] A second valve plate 22 is provided on one side of the unloading hole 21 located in the exhaust chamber 17, and a valve plate limiting plate 19 is provided on the back side of the high and low pressure partition plate 2. The second valve plate 22 is fixed on the valve plate limiting plate 19, and the gas can only enter the exhaust chamber from the back pressure chamber 7 but cannot flow back.

[0030] The back pressure hole 23 is provided with a first valve plate 18 on one side of the back pressure chamber 7, and the fixed vortex 5 is provided with a valve plate limiting plate 19 on one side of the back pressure chamber 7. The first valve plate 18 is fixed on the valve plate limiting plate 19, and the gas can only enter the back pressure chamber 7 from the compression chamber but cannot flow back.

[0031] When the pressure in the compression chamber is higher than the pressure in the back-pressure chamber 7, the first valve plate 18 opens and the gas enters the back-pressure chamber 7. When the pressure in the compression chamber is lower than the pressure in the back-pressure chamber 7, the first valve plate 18 closes to prevent the gas from flowing back and avoid leakage of gas from the back-pressure chamber 7 to the compression chamber, thereby achieving the purpose of reducing repeated compression and increasing power consumption. In addition, a unidirectionally conductive first valve plate is arranged on the back-pressure hole 23 to stabilize the pressure in the back-pressure chamber 7, thereby ensuring that under the minimum back pressure, the fixed scroll 5 can also press the movable scroll 6, thereby reducing the maximum pressure in the back-pressure chamber 7, thereby reducing the contact force between the movable scroll 6 and the fixed scroll 5, reducing wear, and further reducing power consumption.

[0032] In some embodiments, a plurality of back-pressure holes 23 may be provided, and each back-pressure hole 23 is provided with a first valve plate 18 .

[0033] In some embodiments, a plurality of unloading holes 21 may be provided, and each unloading hole 21 is provided with a second valve plate 22 .

[0034] A main bearing support 9 is fixed to the inner side of the housing 10, and a fixing ring 16 is provided on the upper side of the fixed vortex 5. The fixed vortex 5 is fixed to the upper end of the main bearing support 9 by bolts using the fixing ring 16. The fixed vortex 5 and the fixing ring 16 are clearance-fitted, and the fixed vortex 5 can move axially slightly along the fixing ring 16. The gas pressure in the back pressure chamber 7 generates a downward back pressure on the fixed vortex 5. By selecting a suitable position of the back pressure hole 23, the back pressure is made just greater than the upward force generated by the gas in the compression chamber on the fixed vortex 5, ensuring that the fixed vortex 5 presses the movable vortex 6, so that the tooth tops of the movable vortex 6 and the fixed vortex 5 are in contact, thereby achieving a flexible seal of the vortex tooth tops.

[0035] A secondary bearing support 13 is fixed to the lower end of the housing 10, and the driving crankshaft 11 is rotatably installed between the main bearing support 9 and the secondary bearing support 13. The top end of the driving crankshaft 11 is connected to the movable scroll 6, and the driving crankshaft 11 is connected to the driving motor 12. The driving motor 12 drives the driving crankshaft 11 to rotate, and the movable scroll 6 rotates relative to the fixed scroll 5. The airflow is sucked into the suction chamber 15 from the suction pipe 8, and enters the compression chamber from the suction chamber 15.

[0036] 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. A vortex compressor with a pressure relief structure, comprising a housing (10), an upper cover (20) being provided at the upper end of the housing (10), a lower cover (14) being provided at the lower end of the housing (10), a movable scroll (6) and a fixed scroll (5) being provided in cooperation with each other at the upper position in the housing (10), a compression chamber being formed between the movable scroll (6) and the fixed scroll (5), and characterized in that: A high-low pressure partition plate (2) is fixedly provided on the upper side of the fixed scroll (5), a back pressure chamber (7) is formed between the high-low pressure partition plate (2) and the fixed scroll (5), a back pressure hole (23) is provided on the fixed scroll (5), so that the back pressure chamber (7) is connected to the compression chamber, and an unloading hole (21) is provided on the high-low pressure partition plate (2), so that the back pressure chamber (7) is connected to the exhaust chamber (17).

2. A vortex compressor with a pressure relief structure according to claim 1, characterized in that: The unloading hole (21) is provided with a second valve plate (22) on one side of the exhaust chamber (17).

3. A vortex compressor with a pressure relief structure according to claim 2, characterized in that: A valve plate limiting plate (19) is provided on the back side of the high-low pressure partition (2), and the second valve plate (22) is fixed on the valve plate limiting plate (19), so that the gas can only enter the exhaust chamber from the back pressure chamber (7) but cannot flow back.

4. A vortex compressor with a pressure relief structure according to claim 1, characterized in that: The back pressure hole (23) is located on one side of the back pressure cavity (7) and is provided with a first valve plate (18).

5. A vortex compressor with a pressure relief structure according to claim 4, characterized in that: The fixed scroll (5) is provided with a valve plate limit plate (19) on one side of the back pressure chamber (7), and the first valve plate (18) is fixed on the valve plate limit plate (19), so that the gas can only enter the back pressure chamber (7) from the compression chamber but cannot flow back.

6. A vortex compressor with a pressure relief structure according to claim 1, characterized in that: A plurality of back pressure holes (23) may be provided, and each back pressure hole (23) is provided with a first valve plate (18).

7. A vortex compressor with a pressure relief structure according to claim 1, characterized in that: A plurality of unloading holes (21) may be provided, and each unloading hole (21) is provided with a second valve plate (22).

8. The vortex compressor with a pressure relief structure according to claim 1, characterized in that: A first sealing ring (3) and a second sealing ring (4) are installed between the high- and low-pressure partition plates (2) and the fixed scroll (5).

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