High-reliability and low-pulsation scroll compressor and static disc thereof

Abstract

An anti-rotation mechanism is arranged between a movable disc and a front cover of the scroll compressor with the high reliability and the low pulsation, and the anti-rotation mechanism comprises a rear fixed bead ring arranged on the back face of the movable disc and a front fixed bead ring arranged on the inner side of the front cover. The front bead fixing ring and the rear bead fixing ring are each of an annular sheet structure, circular holes which are equal in number and distributed annularly are formed in the front bead fixing ring and the rear bead fixing ring, the circular holes in the front bead fixing ring correspond to the circular holes in the rear bead fixing ring in a one-to-one mode, and steel balls are arranged between the circular holes in the front bead fixing ring and the circular holes in the rear bead fixing ring. An annular front check ring is arranged between the front fixed bead ring and the front cover, the front check ring corresponds to a round hole of the front fixed bead ring, an annular rear check ring is arranged between the rear fixed bead ring and the movable disc, the rear check ring corresponds to a round hole of the rear fixed bead ring, and the steel ball is clamped between the front check ring and the rear check ring; an annular groove is formed in the wall face of the middle position of the exhaust hole of the static disc.

Description

TECHNICAL FIELD

[0001] The present application relates to a high-reliability, low-pulsation scroll compressor and a static plate thereof, and belongs to the technical field of scroll compressors. BACKGROUND

[0002] Scroll compressors are widely used in the fields of refrigeration and heat pump due to their high efficiency, low noise and small vibration. The core working principle of scroll compressors is that a series of crescent-shaped compression chambers with changing volume are formed through the meshing of a dynamic scroll plate and a static scroll plate, thereby completing the processes of gas suction, compression and discharge.

[0003] However, the scroll compressor of the prior art still has some deficiencies. When the dynamic plate of the scroll compressor rotates under the driving of the crankshaft, in order to prevent the scroll compressor from rotating by itself, the prior art usually uses a stop mechanism of a ring pin structure. This ring pin structure is to set a positioning pin on the front cover, set a positioning hole on the back surface of the dynamic plate, and set a positioning ring for limiting the positioning pin in the positioning hole. The self-rotation of the dynamic plate is inhibited by the positioning pin. Since the contact area between the positioning pin and the inner wall of the positioning ring is large, the friction is large, which increases the noise of the compressor during operation. After a long time of use, the damage of the positioning pin reduces the reliability of the operation of the compressor. In addition, when the compressed gas is discharged from the exhaust port on the back surface of the static plate, strong pressure pulsation is generated, which increases the noise of the compressor. When the scroll compressor is applied to an automobile air conditioner, it seriously affects the user experience. SUMMARY

[0004] The present application aims to provide a high-reliability, low-pulsation scroll compressor to solve the technical problems of unreliable operation and high exhaust pulsation of the stop mechanism of the ring pin structure of the scroll compressor of the prior art. Meanwhile, the present application also provides a static plate of the scroll compressor.

[0005] The high-reliability, low-pulsation scroll compressor of the present application adopts the following technical scheme: a high-reliability, low-pulsation scroll compressor, which comprises a dynamic plate and a static plate arranged in meshing, the back surface of the dynamic plate is provided with a front cover, the back surface of the static plate is provided with a machine shell, the back surface of the static plate is provided with an exhaust hole communicating with the inner cavity of the machine shell, the front cover and the machine shell are fixedly connected to form a volume cavity, a self-rotation prevention mechanism is arranged between the dynamic plate and the front cover, the self-rotation prevention mechanism comprises a rear positioning bead ring arranged on the back surface of the dynamic plate and a front positioning bead ring arranged on the inner side of the front cover, the front positioning bead ring and the rear positioning bead ring are both in the shape of an annular sheet, the circular holes on the front positioning bead ring and the rear positioning bead ring are arranged one by one in correspondence, a steel ball is arranged between the circular holes of the front positioning bead ring and the rear positioning bead ring, an annular front stop ring is arranged between the front positioning bead ring and the front cover, the front stop ring corresponds to the circular hole of the front positioning bead ring, an annular rear stop ring is arranged between the rear positioning bead ring and the dynamic plate, the rear stop ring corresponds to the circular hole of the rear positioning bead ring, and the steel ball is clamped between the front stop ring and the rear stop ring; an annular groove is formed on the wall surface of the middle position of the exhaust hole on the static plate.

[0006] The outer edge of the back surface of the orbiting plate is provided with a stepped outer annular mounting surface, the rear stop ring is mounted on the outer annular step surface, and the rear retainer ring is fixed to the back surface of the orbiting plate by the cotter pin.

[0007] The number of the cotter pins is four, and each cotter pin is uniformly arranged at the position close to the inner edge of the rear retainer ring.

[0008] The inner side surface of the front cover is provided with a stepped inner annular mounting surface, the front stop ring is mounted on the inner annular step surface, and the front retainer ring is fixed to the front cover by the roll pin.

[0009] The number of the roll pins is two, and each roll pin is uniformly arranged at the position close to the outer edge of the front retainer ring.

[0010] The thickness of the front stop ring and the rear stop ring is greater than 2 mm, and the side close to each other of the circular holes of the front retainer ring and the rear retainer ring has a gradually expanding tapered edge.

[0011] The length of the annular groove accounts for 40-50% of the total length of the exhaust hole.

[0012] The diameter of the annular groove is 1.5-2 times of the minimum diameter of the exhaust hole.

[0013] The static plate of the scroll compressor adopts the following technical scheme: The front stop ring is arranged between the front retainer ring and the front cover, the rear stop ring and the rear retainer ring are arranged on the back of the orbiting plate, the steel ball is arranged between the front retainer ring, the front stop ring, the rear retainer ring and the rear stop ring, the front stop ring and the rear stop ring can limit the axial position of the steel ball, thereby limiting the rotation angle of the orbiting plate, and the front stop ring and the rear stop ring have the functions of wear resistance and impact resistance. The present application uses the steel ball and the stop ring to limit the position of the orbiting plate, the contact area of the steel ball and the stop ring is small, the noise generated is small, the steel ball is not easy to damage, and the operation of the compressor is reliable. The present application sets an annular groove in the middle of the exhaust hole of the static plate, the annular groove provides a “buffer zone” for the flow of high-pressure gas, the high-pressure gas expands when passing through the annular groove, thereby reducing the flow rate, so that the flow rate during exhaust is gentle, the pulsation is reduced, the noise is reduced, and the user experience is good.

[0014] As a preferred scheme, the four cotter pins connecting the orbiting plate and the rear retainer ring are uniformly distributed, so that the stress of each cotter pin is small, and the rigidity and stability of the connection between the cotter pin and the rear retainer ring are significantly improved, thereby preventing the rear retainer ring from loosening.

[0015] As a preferred scheme, since the hardness of the front cover and the orbiting plate is different, the front cover is softer, and if the front retainer ring is fixed by using the cotter pin during assembly, the problem of skin cutting may exist, therefore the front retainer ring is fixed by using the roll pin.

[0016] As a preferred option, the thickness of both the front and rear stop rings is 2mm or more, which can significantly improve the wear resistance and impact resistance of the stop rings, avoid wear, deformation or even breakage caused by alternating loads and impacts inside the compressor, and improve the service life of the compressor.

[0017] As a preferred option, the edges of the round holes in the front and rear fixed bead rings are tapered, which allows for better adaptation to the steel balls. Attached Figure Description

[0018] Figure 1 This is a schematic cross-sectional view of the assembly of a high-reliability, low-pulsation scroll compressor according to an embodiment of the present invention. Figure 2 yes Figure 1 A schematic diagram of the front cover; Figure 3 yes Figure 1 A schematic diagram showing the connection between the moving plate and the fixed bead ring via four cotter pins; Figure 4 yes Figure 3 BB-direction cross-section Figure 5 Figure 1 A plan view of the back of the middle stilling plate; Figure 6 yes Figure 5 CC-direction sectional view; Figure 7 yes Figure 1 A 3D rendering of the back of the central control plate; Figure 8 yes Figure 1 A 3D rendering of the inside of the front cover.

[0019] In the diagram: 1-Front cover, 2-Front stop ring, 3-Front fixed bead ring, 4-Steel ball, 5-Rear fixed bead ring, 6-Rear stop ring, 7-Moving disc, 8-Stationary disc, 9-Main housing, 10-Coil pin, 11-Cotter pin, 12-Annular groove, 13-Exhaust hole. Detailed Implementation

[0020] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0021] A schematic diagram of a high-reliability, low-pulsation scroll compressor according to an embodiment of the present invention is shown below. Figures 1 to 4As shown, the high-reliability, low-pulsation scroll compressor of this embodiment includes a moving disc 7 and a stationary disc 8 meshing together. A front cover 1 is provided on the back of the moving disc 7, and a housing 9 is provided on the back of the stationary disc 8. An exhaust port 13 communicating with the inner cavity of the housing 9 is opened on the back of the stationary disc 8. The front cover 1 and the housing 9 are fixedly connected to form a volumetric cavity. An anti-rotation mechanism is provided between the moving disc 7 and the front cover 1. The anti-rotation mechanism includes a rear fixed bead ring 5 on the back of the moving disc 7 and a front fixed bead ring 3 inside the front cover 1. Both the front fixed bead ring 3 and the rear fixed bead ring 5 adopt an annular plate structure, and both the front fixed bead ring 3 and the rear fixed bead ring 5 have an equal number of ring-shaped bead rings. The circular holes distributed on the front fixed bead ring 3 and the rear fixed bead ring 5 are arranged in a one-to-one correspondence. A steel ball 4 is placed between the circular holes of the front fixed bead ring 3 and the rear fixed bead ring 5. The side of the circular holes of the front fixed bead ring 3 and the rear fixed bead ring 5 that is close to each other has a gradually expanding conical edge. An annular front stop ring 2 is provided between the front fixed bead ring 3 and the front cover 1. The front stop ring 2 corresponds to the circular hole of the front fixed bead ring 3. An annular rear stop ring 6 is provided between the rear fixed bead ring 5 and the moving plate 7. The rear stop ring 6 corresponds to the circular hole of the rear fixed bead ring 5. The steel ball 4 is sandwiched between the front stop ring 2 and the rear stop ring 6. The thickness of the front stop ring 2 and the rear stop ring 6 is greater than 2mm. An annular groove 12 is opened on the wall surface of the vent hole 13 at the middle position on the stationary plate 7. The length of the annular groove 12 accounts for 40~50% of the total length of the vent hole 13. The diameter of the annular groove 12 is 1.5 to 2 times the minimum diameter of the exhaust hole 13.

[0022] The outer edge of the back of the moving plate 7 is provided with a stepped outer annular mounting surface. The rear stop ring 6 is mounted on the outer annular stepped surface, and the rear fixed bead ring 5 is fixed to the back of the moving plate by cotter pins. There are four cotter pins 11, and each cotter pin 11 is evenly distributed near the inner edge of the rear fixed bead ring 5.

[0023] The inner side of the front cover 1 is provided with a stepped inner annular mounting surface. The front stop ring 2 is mounted on the inner annular stepped surface, and the front retaining ring 3 is fixed to the front cover 1 by coiled pins 10. There are two coiled pins 10, and each coiled pin 10 is evenly distributed near the outer edge of the front retaining ring 3.

[0024] like Figures 1 to 3 As shown, the front retaining ring 3 is fixed to the front cover 1 by a coiled pin 10, and the front stop ring 2 is positioned between the front retaining ring 3 and the front cover 1. The rear stop ring 6 and the rear retaining ring 5 are positioned on the back of the moving plate 7, and the rear retaining ring 5 is connected to the moving plate 7 by four cotter pins 11. The steel ball 4 is placed between the front retaining ring 3, the front stop ring 2, the rear retaining ring 5, and the rear stop ring 6. The front stop ring 2 and the rear stop ring 6 can restrict the axial position of the steel ball, thereby limiting the rotation angle of the moving plate, and also have wear-resistant and impact-resistant properties. The edges of the circular holes of the front retaining ring 3 and the rear retaining ring 5 adopt a tapered structure, which allows for better adaptation to the steel ball.

[0025] In this embodiment, the thickness of both the front stop ring 2 and the rear stop ring 6 is 2mm or more, which can significantly improve the wear resistance and impact resistance of the stop rings. Figure 3 As shown, the four cotter pins 11 connecting the moving plate 7 and the rear fixed bead ring 5 are evenly and symmetrically distributed (at 90° intervals), which reduces the force on each cotter pin 11 and significantly improves the rigidity and stability of the connection between the cotter pin 11 and the rear fixed bead ring 5, preventing the rear fixed bead ring 5 from loosening. Since the front cover 1 and the moving plate 7 have different hardnesses, with the front cover being softer, using cotter pins to fix the front fixed bead ring during assembly would cause the skin to be cut. Therefore, coiled pins are used to fix the front fixed bead ring 3.

[0026] like Figure 1 and Figure 4 As shown, one end of the stationary disc 8 is fixedly connected to the housing 9 with bolts, and the other end is inserted into the moving disc 7. The moving disc 7 and the stationary disc 8 mesh to form a compression chamber, completing the process of gas intake, compression and discharge. When high-pressure gas is discharged from the compression chamber through the exhaust port 13 of the stationary disc, strong pressure pulsation will be generated, which will increase the noise of the compressor. In this invention, in order to solve this problem, an annular groove 12 is provided in the middle of the exhaust port 13 of the stationary disc. The annular groove 12 provides a "buffer zone" for the flow of high-pressure gas. When the high-pressure gas passes through the annular groove 12, it expands and the flow rate decreases. Therefore, the flow rate during exhaust is smooth and the pulsation is reduced.

[0027] In one embodiment of the present invention, the stationary plate of a scroll compressor has an exhaust port on its back side, and an annular groove is formed on the wall surface at the center of the exhaust port. The length of the annular groove accounts for 40-50% of the total length of the exhaust port; the diameter of the annular groove is 1.5-2 times the minimum diameter of the exhaust port.

[0028] The above specific embodiments are merely detailed explanations of the technical solutions of the present invention. The present invention is not limited to the above embodiments. Those skilled in the art should understand that any improvements or substitutions made based on the above principles and spirit on the basis of the present invention should be within the protection scope of the present invention.

Claims

1. A high-reliability, low-pulsation scroll compressor, comprising a moving disc and a stationary disc meshing together, a front cover on the back of the moving disc, a housing on the back of the stationary disc, an exhaust port communicating with the inner cavity of the housing on the back of the stationary disc, the front cover and the housing being fixedly connected to form a volumetric cavity, and an anti-self-rotation mechanism being provided between the moving disc and the front cover, characterized in that: The anti-rotation mechanism includes a rear fixed bead ring on the back of the moving plate and a front fixed bead ring inside the front cover. Both the front and rear fixed bead rings are annular plate structures. An equal number of circular holes are provided on both the front and rear fixed bead rings, arranged in a ring shape. The circular holes on the front and rear fixed bead rings correspond one-to-one. A steel ball is placed between the circular holes of the front and rear fixed bead rings. An annular front stop ring is provided between the front fixed bead ring and the front cover, corresponding to the circular hole of the front fixed bead ring. An annular rear stop ring is provided between the rear fixed bead ring and the moving plate, corresponding to the circular hole of the rear fixed bead ring. The steel ball is sandwiched between the front and rear stop rings. An annular groove is provided on the wall surface at the center of the exhaust hole on the stationary plate.

2. The high-reliability, low-pulsation scroll compressor according to claim 1, characterized in that: The outer edge of the back of the moving plate is provided with a stepped outer annular mounting surface, the rear stop ring is mounted on the outer annular stepped surface, and the rear fixed bead ring is fixed to the back of the moving plate by a cotter pin.

3. The high-reliability, low-pulsation scroll compressor according to claim 2, characterized in that: The number of cotter pins is four, and each cotter pin is evenly distributed near the inner edge of the rear bead ring.

4. The high-reliability, low-pulsation scroll compressor according to claim 1, characterized in that: The inner side of the front cover is provided with a stepped inner annular mounting surface, the front stop ring is mounted on the inner annular stepped surface, and the front retaining ring is fixed to the front cover by a coil pin.

5. The high-reliability, low-pulsation scroll compressor according to claim 4, characterized in that: The number of pins is two, and each pin is evenly distributed near the outer edge of the front bead ring.

6. The high-reliability, low-pulsation scroll compressor according to claim 1, characterized in that: The thickness of both the front and rear stop rings is greater than 2 mm; the circular holes of the front and rear stop rings have gradually enlarging tapered edges on the side that are close to each other.

7. The high-reliability, low-pulsation scroll compressor according to claim 1, characterized in that: The length of the annular groove accounts for 40-50% of the total length of the exhaust port.

8. The high-reliability, low-pulsation scroll compressor according to claim 1, characterized in that: The diameter of the annular groove is 1.5 to 2 times the minimum diameter of the exhaust hole.

9. A stationary disc of a scroll compressor, wherein the stationary disc of the scroll compressor has an exhaust port on its back side, characterized in that: An annular groove is formed on the wall surface at the center of the vent hole on the static plate.

10. The stationary disc of the scroll compressor according to claim 9, characterized in that: The length of the annular groove accounts for 40-50% of the total length of the exhaust hole; the diameter of the annular groove is 1.5-2 times the minimum diameter of the exhaust hole.

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