Structure and working principle of scroll compressor in cooling water circulation machine
We all know that the compressor is the core power of the cooling water circulation machine. It is better than the human heart. The compressor is divided into various kinds. The structure and principle of the scroll compressor in the most common medium-cooling water circulation machine today, although the customer does not care much. Principle structure <br> In recent years, scroll compressors have attracted people's attention due to their high efficiency, low noise and balanced operation, and have been gradually applied in room air conditioners. The scroll compressor is also a volumetric compressor, which uses the vortex rotor to mesh with the scroll stator to form a plurality of compression chambers. As the vortex rotor rotates, the volume of each compression chamber changes continuously to compress. Gas.
At present, scroll compressors are used in air conditioners with a cooling capacity of approximately 6000 to 11,000W.
1. The internal structure of the structure scroll compressor is shown in the figure below. It consists of two scrolls, bearings, base, cross coupling ring, eccentric shaft and so on.
The working fluid from the evaporator enters the compressor casing through the suction pipe 4, is compressed by the vortex rotor 3 and the scroll stator 2 at the upper portion of the casing, is discharged from the center hole of the scroll stator, and is passed through the high and low pressure partition cover. 26 enters the top exhaust chamber 25. A sealing surface is provided between the partition cover and the scroll stator. A check valve 24 is provided at the casing exhaust pipe 1. In the vicinity of the central exhaust port of the scroll stator, a bypass duct 20 is provided, which is controlled by a bimetal temperature control sheet 23. When the exhaust gas temperature is too high, the temperature control sheet opens the passage port to bypass the high and low pressure, the pressure in the exhaust chamber is lowered, the check valve is closed, and the compressor is in an unloaded state to prevent the compressor from overheating. In this way, the compressor discharge temperature can be controlled below 150 ° C to avoid damage to the compressor. The eccentric shaft 7 is in contact with the cross ring 18 so that the vortex rotor can only revolve around the scroll stator. A swimming bushing 17 is disposed between the vortex rotating sub-disc and the eccentric pin. The lubrication of the compressor is performed by centrifugal centrifugal force during operation, and the lubricating oil in the oil pool in the lower part of the casing is sent to the main bearing, the eccentric pin, and the swimming bushing along the oil passage in the eccentric shaft for lubrication. The built-in motor is located in the lower part of the casing, and the stator is tightly fitted to the casing so that the casing becomes the heat dissipation surface of the motor. Balance blocks 6 and 14 are provided at the upper and lower ends of the rotor of the motor to balance the moment of inertia generated by the vortex rotor.
2. Working principle The working chamber of the scroll compressor is formed by the engagement of two scrolls. The profile of the vortex (lower figure) generally uses a circular involute with a base circle radius of α, and the wall thickness δ of the vortex is formed by the different starting angles of the involute. A scroll is formed when the axial direction has a certain height H.
One of the two scrolls is a stationary scroll stator, and the other is a vortex rotor for translational rotation. The vortex rotor and the vortex stator have a circumferential phase difference of 180°, and the center offset e=πα-δ, so that the profiles of the two vortex bodies have multiple meshing points, forming a plurality of closed cells (below). The center of the vortex rotor can only be rotated around the center of the scroll stator, with the eccentricity e being the radius of the translation and not rotating around the vortex rotor. A venting opening of a certain size is arranged at the center of the vortex rotor, and an air suction port is provided at the periphery thereof to directly pass through the periphery of the vortex rotor. The following figure a shows that the outermost circle of the rotor and the stator are just engaged at the end point, and the two symmetrical chambers (shaded portions) at the outermost periphery have just completed their inhalation process. With the rotation of the eccentric shaft and the flat movement of the vortex rotor, the two scrolls maintain a good meshing, so that the gas in the outer ring chamber continuously moves toward the center, the volume continues to shrink, the pressure gradually rises, and the compression process begins ( Figure ag, the angle of the relative eccentric shaft per turn is 120°). The compression process continues until the space between the two chambers merges into a central chamber that communicates with the exhaust port, and then begins to vent outward through the exhaust port (h), and continues until the space of the chamber disappears. Gas process. At the same time as these processes are carried out, the outer ring profile is opened multiple times, and the gas is continuously sucked into the vortex outer ring chamber until the end of the outer ring is closed (d, g below), and the suction process is completed multiple times. The compression process in a scroll compressor is an internal compression process with a certain internal volume ratio, and has a certain internal pressure ratio. There is no need to provide an intake valve and an exhaust valve, and there is no clearance volume, and there is no work. Expansion process.
Shenzhen Davos Equipment Co., Ltd. focuses on solving various laboratory precision instruments and process cooling
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We all know that the compressor is the core power of the cooling water circulation machine. It is better than the human heart. The compressor is divided into various kinds. The structure and principle of the scroll compressor in the most common medium-cooling water circulation machine today, although the customer does not care much. Principle structure <br> In recent years, scroll compressors have attracted people's attention due to their high efficiency, low noise and balanced operation, and have been gradually applied in room air conditioners. The scroll compressor is also a volumetric compressor, which uses the vortex rotor to mesh with the scroll stator to form a plurality of compression chambers. As the vortex rotor rotates, the volume of each compression chamber changes continuously to compress. Gas.
At present, scroll compressors are used in air conditioners with a cooling capacity of approximately 6000 to 11,000W.
1. The internal structure of the structure scroll compressor is shown in the figure below. It consists of two scrolls, bearings, base, cross coupling ring, eccentric shaft and so on.
The working fluid from the evaporator enters the compressor casing through the suction pipe 4, is compressed by the vortex rotor 3 and the scroll stator 2 at the upper portion of the casing, is discharged from the center hole of the scroll stator, and is passed through the high and low pressure partition cover. 26 enters the top exhaust chamber 25. A sealing surface is provided between the partition cover and the scroll stator. A check valve 24 is provided at the casing exhaust pipe 1. In the vicinity of the central exhaust port of the scroll stator, a bypass duct 20 is provided, which is controlled by a bimetal temperature control sheet 23. When the exhaust gas temperature is too high, the temperature control sheet opens the passage port to bypass the high and low pressure, the pressure in the exhaust chamber is lowered, the check valve is closed, and the compressor is in an unloaded state to prevent the compressor from overheating. In this way, the compressor discharge temperature can be controlled below 150 ° C to avoid damage to the compressor. The eccentric shaft 7 is in contact with the cross ring 18 so that the vortex rotor can only revolve around the scroll stator. A swimming bushing 17 is disposed between the vortex rotating sub-disc and the eccentric pin. The lubrication of the compressor is performed by centrifugal centrifugal force during operation, and the lubricating oil in the oil pool in the lower part of the casing is sent to the main bearing, the eccentric pin, and the swimming bushing along the oil passage in the eccentric shaft for lubrication. The built-in motor is located in the lower part of the casing, and the stator is tightly fitted to the casing so that the casing becomes the heat dissipation surface of the motor. Balance blocks 6 and 14 are provided at the upper and lower ends of the rotor of the motor to balance the moment of inertia generated by the vortex rotor.
2. Working principle The working chamber of the scroll compressor is formed by the engagement of two scrolls. The profile of the vortex (lower figure) generally uses a circular involute with a base circle radius of α, and the wall thickness δ of the vortex is formed by the different starting angles of the involute. A scroll is formed when the axial direction has a certain height H.
One of the two scrolls is a stationary scroll stator, and the other is a vortex rotor for translational rotation. The vortex rotor and the vortex stator have a circumferential phase difference of 180°, and the center offset e=πα-δ, so that the profiles of the two vortex bodies have multiple meshing points, forming a plurality of closed cells (below). The center of the vortex rotor can only be rotated around the center of the scroll stator, with the eccentricity e being the radius of the translation and not rotating around the vortex rotor. A venting opening of a certain size is arranged at the center of the vortex rotor, and an air suction port is provided at the periphery thereof to directly pass through the periphery of the vortex rotor. The following figure a shows that the outermost circle of the rotor and the stator are just engaged at the end point, and the two symmetrical chambers (shaded portions) at the outermost periphery have just completed their inhalation process. With the rotation of the eccentric shaft and the flat movement of the vortex rotor, the two scrolls maintain a good meshing, so that the gas in the outer ring chamber continuously moves toward the center, the volume continues to shrink, the pressure gradually rises, and the compression process begins ( Figure ag, the angle of the relative eccentric shaft per turn is 120°). The compression process continues until the space between the two chambers merges into a central chamber that communicates with the exhaust port, and then begins to vent outward through the exhaust port (h), and continues until the space of the chamber disappears. Gas process. At the same time as these processes are carried out, the outer ring profile is opened multiple times, and the gas is continuously sucked into the vortex outer ring chamber until the end of the outer ring is closed (d, g below), and the suction process is completed multiple times. The compression process in a scroll compressor is an internal compression process with a certain internal volume ratio, and has a certain internal pressure ratio. There is no need to provide an intake valve and an exhaust valve, and there is no clearance volume, and there is no work. Expansion process.
Shenzhen Davos Equipment Co., Ltd. focuses on solving various laboratory precision instruments and process cooling
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