An axially flexible, sealed scroll compressor

Abstract

An axially flexible, sealed scroll compressor, characterized in that it comprises an upper shell (1), a lower shell, and a drive mechanism; wherein the upper shell (1), the upper support (5), and the lower shell are sequentially rigidly connected to one another; a drive mechanism is installed in the lower shell; a counter-pressure mechanism (15) is provided in the upper support (5); the drive mechanism is tightly connected to the upper support (5); the drive mechanism is connected to movable vortices (3), the fixed vortex (2) is tightly connected to the upper end face of the upper support (5); the flexible sealing structure (4), the counter-pressure chamber, and the anti-rotation mechanism (16) are arranged between the movable vortex (3) and the upper support (5), the fixed vortex (2) is tightly connected to the upper shell (1); a pressure inlet channel (10) and a pressure relief channel (11) are provided in the fixed vortex (2);A backpressure valve base (12) and a backpressure valve float (13) are arranged in the fixed vortex (2); the backpressure valve base (12) is tightly connected to the fixed vortex (2); the backpressure valve float (13) is axially displaceably tightly connected to the fixed vortex (2), and when the compressor is in normal operation, the backpressure valve float (13) is in contact with and sealed against the backpressure valve base (12).

Description

Technical area

[0001] The utility model relates to the technical field of the scroll compressor, in particular to an axially flexible, sealed scroll compressor. Background technology

[0002] The scroll compressor is becoming increasingly widely used in the refrigeration industry. The existing scroll compressor consists of a fixed vortex equipped with a spiral scroll tooth, a movable vortex aligned with the fixed scroll tooth and equipped with a spiral scroll tooth, and an anti-rotation mechanism that moves between the movable vortex and the upper support. The anti-rotation mechanism restricts the movement, while the fixed vortex only allows it to be relatively translational. The vortex of the movable vortex and the vortex of the fixed vortex mesh with each other to form multiple pairs of compression cavities.The crankshaft is driven by the engine to drive the swirl to rotate along its rotational speed. The compression cavity moves from the outside to the inside along the swirl, and the volume gradually decreases, thereby realizing compression into the medium, thus completing the intake, compression, and exhaust of gas. To reduce leakage, the swirl tooth tips of two swirl elements must be tightly fitted to the tooth bottoms of the other swirl elements to reduce end-face leakage between adjacent compression chambers.

[0003] In order to bring the upper surface of the vortex tooth of two screws and the lower surface of the teeth of another vortex close to each other, thus reducing the end face leakage between adjacent compression chambers, the prior art provides a pressure pulse port in the part of the movable vortex near the discharge hole, through which the high-pressure fluid is bypassed into the backpressure chamber. At the same time, it is equipped with a backpressure hole to ensure pressure balance. The movable vortex can move axially. When the compressor is operating, the pressure of the backpressure chamber and the compression pressure in the vortex interact, and the movable vortex is pressed along the axial direction to fix the vortex, thus achieving an axial flexible seal between the movable vortex and the fixed vortex. Deficiencies in the state of the art are: 1. The pressure introduction hole is located at the top of the vortex tooth. Since the sealing length is relatively short, it is used to induce leakage. 2. The pressure introduction hole is located near the outlet port, where large deformations occur that cannot be controlled and are prone to leakage. 3. Generally, the surface of the movable vertebra is coated, and the production of holes is more difficult. Content of the utility model

[0004] The utility model provides an axially flexible, sealed scroll compressor to solve the above-mentioned problems.

[0005] To solve the above-mentioned technical problems, the technical solution of the utility model is an axially flexible sealed scroll compressor. It comprises an upper shell, a lower shell, and a drive mechanism. The upper shell, the upper support, and the lower shell are tightly connected to each other. A drive mechanism is installed in the lower shell. A backpressure mechanism is provided in the upper support. The drive mechanism is tightly connected to the upper support. The drive mechanism is connected to the movable vortex, and the fixed vortex is tightly connected to the upper end surface of the upper support. The flexible sealing structure, the backpressure chamber, and the anti-rotation mechanism are arranged between the movable vortex and the upper support, and the fixed vortex is tightly connected to the upper shell.A pressure inlet channel and a pressure relief channel are provided in the fixed vortex. A backpressure valve base and a backpressure valve float are arranged in the fixed vortex. The backpressure valve base is tightly connected to the fixed vortex. The backpressure valve float is axially slidably connected to the fixed vortex. When the compressor is in normal operation, the backpressure valve float is in contact with and sealed from the backpressure valve base.

[0006] In addition, the lower shell includes a lower end cover and a motor shell that are firmly connected to each other.

[0007] The drive mechanism also includes a crankshaft, a motor rotor, a motor stator, and a movable balance block. The motor stator is mounted in the lower shell. The motor rotor is mounted on the lower part of the crankshaft. The upper part of the crankshaft is mounted with a movable balance block. The movable balance block is connected to the movable vertebra.

[0008] In addition, the pressure inlet channel is connected to a high-pressure chamber formed between the upper shell and the fixed vortex.

[0009] In addition, the pressure relief channel is connected to the movable vortex, the flexible sealing structure of the back pressure cavity and the back pressure cavity formed between the upper support.

[0010] In addition, the back pressure valve base is connected to the pressure inlet channel and the pressure relief channel.

[0011] The utility model introduces pressure by adding a backpressure valve structure to the low-pressure region of the fixed vortex. The temperature change in the working area of ​​the backpressure valve is smaller, thermal deformation is minimal, the leakage probability of the backpressure valve is low, and the backpressure floating effect is good. The problems of easy leakage, difficulty in processing large components, and unreliable sealing in the prior art are solved. The backpressure valve is arranged on the fixed vortex, and the processing technology is simple. The axial sealing structure driven by the backpressure valve can significantly improve the volumetric operating efficiency of the compressor. Description with drawings Fig. is a schematic representation of the structure of the utility model. Fig. is a schematic diagram of a local structure of the utility model.

[0012] Including: 1-upper shell, 2-fixed vortex, 3-movable vortex, 4-flexible sealing structure of back pressure chamber, 5-upper support, 6-crankshaft, 7-motor rotor, 8-motor stator, 9-lower end cover, 10-pressure inlet port, 11-pressure relief port, 12-back pressure valve base, 13-back pressure valve float, 14-movable balance block, 15-back pressure mechanism, 16-anti-rotation mechanism, 17-motor shell. The specific embodiment

[0013] The concrete implementation of the utility model is described below in connection with the Fig. described in more detail.

[0014] An axially flexible, sealed scroll compressor, characterized in that it comprises an upper shell 1, a lower shell, and a drive mechanism. The upper shell 1, the upper support 5, and the lower shell are firmly connected to each other in sequence. A drive mechanism is installed in the lower shell. A backpressure mechanism 15 is provided in the upper support 5. The drive mechanism is tightly connected to the upper support 5. The drive mechanism is connected to the movable swirl 3, and the fixed swirl 2 is tightly connected to the upper end surface of the upper support 5. The flexible sealing structure 4, the backpressure chamber, and the anti-rotation mechanism 16 are arranged between the movable swirl 3 and the upper support 5, and the fixed swirl 2 is tightly connected to the upper shell 1. A pressure inlet channel 10 and a pressure relief channel 11 are provided in the fixed swirl 2.A backpressure valve base 12 and a backpressure valve float 13 are arranged in the fixed swirl 2. The backpressure valve base 12 is tightly connected to the fixed swirl 2. The backpressure valve float 13 is axially slidably connected to the fixed swirl 2. When the compressor is in normal operation, the backpressure valve float 13 is in contact with and sealed from the backpressure valve base 12. The pressure inlet channel 10 is connected to a high-pressure chamber formed between the upper shell 1 and the fixed swirl 2. The pressure relief channel 11 is connected to the movable swirl 3, the flexible sealing structure 4 of the backpressure cavity, and the backpressure cavity formed between the upper support 5. The backpressure valve base 12 is connected to the pressure inlet channel 10 and the pressure relief channel 11. The lower shell comprises a lower end cover 9 and a motor shell 17, which are firmly connected to each other.The drive mechanism comprises a crankshaft 6, a motor rotor 7, a motor stator 8, and a movable balance block 14. The motor stator 8 is mounted in the lower shell. The motor rotor 7 is mounted on the lower part of the crankshaft 6. The upper part of the crankshaft 6 is mounted with a movable balance block 14. The movable balance block 14 is connected to the movable scroll 3.

[0015] After the motor stator 8 is energized, a rotating magnetic field is formed to drive the motor rotor 7 and the crankshaft 6 to rotate. The movable balance block 14 is mounted on the eccentric part of the crankshaft 6. The movable swirl 3 is driven by the movable balance block 14 and the crankshaft 6 to perform an orbital motion along the central axis of the crankshaft 6. The anti-rotation mechanism 16 is installed between the movable swirl 3 and the upper support 5 to ensure that the movable swirl 3 can only move translationally and cannot rotate. The movable swirl 3 and the fixed swirl 2 cooperate to form multiple compression chambers to complete the intake, compression, and discharge processes of the compressed working fluid.

[0016] The movable swirl 3 and the movable balance block 14 can move along the eccentricity of the crankshaft 6 along the axial certain range. The movable swirl 3 and the upper support 5 form a backpressure chamber for a backpressure chamber. The flexible sealing structure 4 provides backpressure to force the movable swirl 3 and the fixed scroll 2 to mesh closely. However, too high backpressure may cause excessive friction loss, increase compressor power consumption, and cause swirl wear and reduce energy efficiency. If the backpressure is insufficient, the movable swirl will tip over or detach, causing leakage in the swirl compression chamber and reducing compressor energy efficiency.

[0017] The backpressure valve structure consists of a backpressure valve base 12 and a backpressure valve float 13. The backpressure valve base 12 is connected to the pressure inlet channel 10 to introduce high-pressure gas (exhaust-side pressurized gas) into the backpressure valve base 12. The backpressure valve float 13 is connected to the pressure relief channel 11 and is in contact with and sealed from the backpressure valve base 12. During operation of the movable swirl 3 and the fixed swirl 2, high-pressure gas is generated by exhaust gases, which is introduced into the backpressure chamber structure at the bottom of the movable swirl 3 through the pressure inlet channel 10, the backpressure valve base 12, the backpressure valve float 13, and the pressure relief channel 11. The backpressure generated by the backpressure chamber compresses the axial flexible seal between the movable swirl 3 and the fixed swirl 2.

[0018] The movement state of the back pressure valve float 13 is connected to the state of the movable swirl 3. The high-pressure gas supplied from the back pressure valve base 12 can press the upper end surface of the back pressure valve float 13 to move it downward. The movable swirl 3 and the back pressure valve float 13 cause it to move upward. When the back pressure valve float 13 moves upward and comes into contact with the back pressure valve base 12, the pressure inlet channel 10 and the pressure relief channel 11 are closed. When the movable swirl is in the tilting state or released, the back pressure valve float 13 can move downward, and the lower portion is in contact with the movable swirl 3. At this moment, the back pressure valve float 13 is not in contact with the back pressure valve base 12, so the pressure inlet channel 10 is communicated with the pressure relief channel 11.

[0019] The flipping or disengagement and engagement of the movable swirl 3 causes the backpressure valve float 13 to move up and down, thereby controlling the connection and closure of the pressure inlet channel 10 and the pressure relief channel 11, respectively. When the pressure inlet channel 10 is connected to the pressure relief channel 11, the high-pressure gas is communicated with the backpressure chamber, and the backpressure increases. The backpressure can compress the movable swirl 3 and the fixed swirl 2 to form an axial seal. When the pressure inlet channel 10 and the pressure relief channel 11 are closed, the backpressure in the backpressure chamber slowly decreases simultaneously due to the backpressure mechanism 15. Within a certain period of time, the seal between the movable swirl 3 and the fixed swirl 2 will be broken, and the movable swirl 3 will flip over or detach.

[0020] The backpressure chamber is equipped with a backpressure mechanism 15 that connects the backpressure chamber and the low-pressure chamber. This mechanism ensures the flexible equalization of the backpressure chamber pressure. It should be noted that the flow rate of the backpressure mechanism 15 is smaller than the flow rate of the pressure inlet channel 10 and the pressure relief channel 11.

[0021] The working principle of the utility model is as follows: When the compressor starts, along with the rotation of the movable vortex 3, the pressure in the pressure chamber formed by the movable vortex 3 and the fixed vortex 2 increases. The movable vortex 3 is pushed to the point where it is separated from the fixed vortex 2. At this time, the back pressure valve float 13 opens, and the pressure inlet channel 10 and the pressure relief channel 11 communicate. Part of the pressure in the pressure chamber can enter the back pressure chamber of the movable vortex 3 through the pressure inlet channel 10 and the pressure relief channel 11. At the same time, with the increasing pressure in the back pressure chamber, the movable vortex 3 can move along the axial fixed vortex 2, thus compressing the fixed vortex 2. At this moment, the back pressure valve float 13 is closed, and the pressure inlet channel 10 and the pressure relief channel 11 are closed.The pressure in the backpressure chamber does not increase. Due to the presence of a backpressure mechanism 15, the pressure of the backpressure chamber can be slowly released. When the pressure of the backpressure chamber is insufficient to promote the movable swirl 3 and the fixed swirl 2 to be closely fitted, the movable swirl 3 may tip over or detach at this moment. At this moment, the float of the backpressure valve 13 opens again, the high-pressure fluid is introduced into the backpressure chamber from the pressure inlet channel 10 and the pressure relief channel 11, and the movable channel swirl 3 and the fixed swirl 2 become closely fitted again. Through this structure, it can be repeatedly ensured that the movable swirl 3 and the fixed swirl 2 are always tightly fitted to achieve an axially flexible seal.

[0022] The pressure inlet channel 10 can draw pressure from the outlet hole or the high-pressure chamber. Such a configuration can efficiently introduce a high-pressure airflow into the backpressure valve base 12.

[0023] The sealing of the back pressure valve float 13 and the back pressure valve base 12 takes the form of an end seal or cone seal, and when the back pressure valve float 13 is closed, the pressure inlet channel 10 and the pressure relief channel 11 are closed.

[0024] The back plate of the movable vortex 3 is equipped with a sealing mechanism that can be flexibly balanced to ensure that the back pressure chamber does not leak during the axial movement of the movable vortex 3.

[0025] A counterpressure structure 15 is provided on the upper support 5 or the movable vertebra 3 to ensure that the counterpressure can change when the movement state of the movable vertebra 3 changes.

[0026] Above, only the utility model is a better embodiment, but the scope of protection of the utility model is not limited to that, any person skilled in the art who is familiar with the state of the art of the utility model within the technical scope of the disclosure of the utility model, according to the technical solution of the utility model and its utility model, which is designed to replace or modify as equivalent, will fall within the scope of protection of the utility model.

Claims

[1] An axially flexible, sealed scroll compressor, characterized bythat it comprises an upper shell (1), a lower shell and a drive mechanism; the upper shell (1), the upper support (5) and the lower shell are firmly connected to each other in sequence; a drive mechanism is installed in the lower shell; a counter-pressure mechanism (15) is provided in the upper support (5); the drive mechanism is tightly connected to the upper support (5); the drive mechanism is connected to the movable vortex (3), the fixed vortex (2) is tightly connected to the upper end surface of the upper support (5); the flexible sealing structure (4), the counter-pressure chamber and the anti-rotation mechanism (16) are arranged between the movable vortex (3) and the upper support (5), the fixed vortex (2) is tightly connected to the upper shell (1); a pressure inlet channel (10) and a pressure relief channel (11) are provided in the fixed vortex (2);a backpressure valve base (12) and a backpressure valve float (13) are arranged in the fixed vortex (2); the backpressure valve base (12) is tightly connected to the fixed vortex (2); the backpressure valve float (13) is axially slidably connected to the fixed vortex (2), and when the compressor is in normal operation, the backpressure valve float (13) is in contact with and sealed from the backpressure valve base (12); [2] The axially flexible, sealed scroll compressor according to claim 1, characterized by that the lower shell comprises a lower end cover (9) and a motor shell (17) which are firmly connected to one another. [3] The axially flexible, sealed scroll compressor according to claim 1, characterized bythat the drive mechanism comprises a crankshaft (6), a motor rotor (7), a motor stator (8) and a movable balancing block (14); the motor stator (8) is fastened in the lower shell; the motor rotor (7) is placed on the lower part of the crankshaft (6); the upper part of the crankshaft (6) is placed with a movable balancing block (14); the movable balancing block (14) is connected to the movable vortex (3). [4] The axial, flexible, sealed scroll compressor according to claim 1, characterized by that the pressure inlet channel (10) is connected to a high-pressure chamber formed between the upper shell (1) and the fixed vortex (2). [5] The axially flexible, sealed scroll compressor according to claim 1, characterized bythat the pressure relief channel (11) is connected to the movable vortex (3), the flexible sealing structure (4) of the counterpressure cavity and the counterpressure cavity formed between the upper support (5). [6] The axially flexible, sealed scroll compressor according to claim 1, characterized by that the back pressure valve base (12) is connected to the pressure inlet channel (10) and the pressure relief channel (11).

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