Dynamic and static scroll adaptive back pressure structure and compressor
By adopting the adaptive backpressure structure of the dynamic and static scroll in the compressor, the problem of large suction and exhaust pressure difference is solved, and the appropriate backpressure and contact force is achieved throughout the operating range, reducing wear and leakage, and improving compression performance and reliability of the machine.
Patent Information
- Application Number
- CN201910888573.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2019-09-19
- Publication Date
- 2024-12-31
- Estimated Expiration
- 2039-09-19
AI Technical Summary
In the case of large suction and exhaust pressure difference of existing compressors, the back pressure is too large or insufficient, resulting in improper contact force of dynamic and static scrolls, increasing friction loss and leakage, affecting compressor performance, especially in R744 compressors. More serious.
Adaptive backpressure structure of dynamic and static vortex is adopted. By setting tooth top sealing grooves and ventilation grooves on the static vortex and volatile vortex, a closed-loop backpressure structure is formed, and the pressure of the medium pressure chamber is adaptively adjusted to ensure that the dynamic and static vortex is throughout. Appropriate contact force within the operating range.
The appropriate backpressure pressure and dynamic scroll contact force over the entire operating range are achieved, reducing wear and leakage, and improving the performance and reliability of the compressor.
Smart Images
Figure CN110469505B_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the field of compressors, and in particular to a dynamic and static scroll adaptive back pressure structure and a compressor. Background Art
[0002] As energy is decreasing and environmental pollution is increasing, new energy vehicles are strongly supported by the country due to their environmental protection and energy-saving characteristics. As an important part of new energy vehicles, electric compressors play a very important role. As the core component of the air-conditioning system of new energy vehicles, electric compressors play an irreplaceable role. The performance, vibration noise, reliability, sealing, etc. of electric compressors are all important factors affecting their operation.
[0003] With the development of the Montreal Protocol and the Kyoto Protocol, HCFC replacement technology has received more and more attention. CO2 (R744) is a natural substance with ODP=0, GWP=1. It is widely available, low-cost, safe, non-toxic, non-flammable, and suitable for various lubricating oils and commonly used mechanical parts materials. It does not decompose and produce harmful gases even at high temperatures. R744 has a large latent heat of evaporation and a very high refrigeration capacity per unit volume, so the compressor size is small; the adiabatic index is high, the volumetric efficiency is relatively large, and there is great potential for development. Compared with current compressors, the operating pressure of R744 compressors is higher, and the suction and exhaust pressure difference is large. In order to meet the operation of different working conditions, a back pressure design is required to improve performance.
[0004] At present, the commonly used back pressure method is to use a shaft seal and add a sealing ring on the back of the moving scroll to form a sealed chamber; the intermediate pressure is obtained by throttling the exhaust chamber or punching a hole in the intermediate compression chamber of the scroll and introduced into the back pressure chamber, thereby providing floating force for the moving scroll and increasing the sealing effect of the moving and static scrolls.
[0005] The current back pressure form cannot fully meet the entire operating range of the automotive air-conditioning compressor. In the area with large pressure difference (upper left corner of the operating range), there will be too much back pressure, which will cause the dynamic and static vortices to be close together and the contact force to be too large, increasing the friction loss of the compressor and reducing performance; in the area with small pressure difference (lower right corner of the operating range), there will be insufficient back pressure, causing the dynamic and static vortices to separate and the compression chamber to leak, increasing the repeated work of the compressor and reducing performance. Especially for the R744 compressor, its suction and exhaust pressure difference is larger than that of traditional compressors, making the above situation more serious. Summary of the invention
[0006] In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a dynamic and static scroll adaptive back pressure structure and a compressor, so as to solve the problem of large suction and exhaust pressure difference in the prior art.
[0007] To achieve the above-mentioned and other related purposes, the present invention provides a dynamic and static vortex adaptive back pressure structure, comprising:
[0008] A stationary scroll is arranged on the stationary disk, wherein the stationary scroll is provided with a first tooth tip sealing groove and a first sealing strip arranged in the first tooth tip sealing groove;
[0009] A movable scroll is arranged on the movable plate, the fixed scroll and the movable scroll rotate in opposite directions and can cooperate to form a plurality of compression chambers, and the movable scroll is provided with a second tooth top sealing groove and a second sealing strip arranged in the second tooth top sealing groove;
[0010] A second ventilation groove is provided at the bottom of the second tooth tip sealing groove along the rotation direction of the movable scroll, and the second ventilation groove is connected to the exhaust port of the fixed scroll;
[0011] The movable vortex is disposed on one side of the movable disk, a medium-pressure cavity is disposed at the center of the other side of the movable disk, and at least one back-pressure hole is disposed at the bottom of the second ventilation groove, and the back-pressure hole is communicated with the medium-pressure cavity.
[0012] Optionally, a first ventilation groove is provided at the bottom of the first tooth top sealing groove along the rotation direction of the static vortex, and the first ventilation groove is connected to the exhaust port of the static vortex.
[0013] Optionally, the groove width of the first ventilation groove is smaller than the groove width of the first tooth top sealing groove, and the groove width of the second ventilation groove is smaller than the groove width of the second tooth top sealing groove.
[0014] Optionally, the first ventilation groove is a square groove, and the first ventilation groove and the first tooth top sealing groove form a T-shaped structure; the second ventilation groove is a square groove, and the second ventilation groove and the second tooth top sealing groove form a T-shaped structure.
[0015] Optionally, the first ventilation groove is an arc-shaped groove, and the first ventilation groove and the first tooth top sealing groove form a U-shaped structure; the second ventilation groove is an arc-shaped groove, and the second ventilation groove and the second tooth top sealing groove form a U-shaped structure.
[0016] Optionally, the total cross-sectional area of the first ventilation grooves is S1, the total cross-sectional area of the first ventilation grooves is S3, and the area of the exhaust port is S2, S1<1 / 5S2, and S3<1 / 5S2.
[0017] Optionally, the cross-sectional area S1 of the second ventilation groove and the area S2 of the exhaust port, S1<1 / 5S2.
[0018] Optionally, within a period of one relative rotation of the movable vortex and the stationary vortex, the conduction time length of the first ventilation groove and the exhaust port is no more than 3 / 4 of a circle.
[0019] Optionally, within a period of one relative rotation of the movable vortex and the stationary vortex, the conduction time length of the second ventilation groove and the exhaust port is no more than 3 / 4 of a circle.
[0020] A compressor comprises the dynamic and static scroll adaptive back pressure structure.
[0021] As described above, the dynamic and static scroll adaptive back pressure structure and compressor of the present invention have at least the following beneficial effects:
[0022] 1. The original open-loop back pressure structure without feedback is changed to a closed-loop back pressure structure, which can adaptively adjust the pressure of the medium pressure chamber to achieve appropriate contact force between the dynamic and static scrolls, reduce wear and leakage of compressor components, and thus improve compressor performance;
[0023] 2. The use of an adaptive back pressure adjustment structure enables the compressor to obtain appropriate back pressure and dynamic and static scroll contact force throughout the entire operating range, reducing compressor wear and improving compressor reliability;
[0024] 3. The use of an adaptive back pressure adjustment structure enables the compressor to obtain appropriate back pressure and dynamic and static scroll contact force throughout the entire operating range, thereby improving the performance of the compressor;
[0025] 4. Due to the use of the adaptive back pressure adjustment structure, the compressor can obtain appropriate back pressure and dynamic and static scroll contact force in the entire operating range, thereby improving the operating range of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] Figure 1 Shown is a schematic diagram of a compressor of the present invention.
[0027] Figure 2 It is a schematic diagram showing a cross section of the movable scroll and the fixed scroll of the present invention when they are matched.
[0028] Figure 3 It is a schematic diagram of a vertical cross section of the movable scroll and the fixed scroll of the present invention when they cooperate.
[0029] Figure 4 Display as Figure 3 A partial enlarged schematic diagram of B in the figure.
[0030] Figure 5 Shown is a schematic diagram of the movable scroll of the present invention.
[0031] Figure 6 Shown is a schematic diagram of a static vortex of the present invention.
[0032] Figure 7 A schematic diagram showing an embodiment of the first ventilation groove and the second ventilation groove of the present invention.
[0033] Figure 8 A schematic diagram showing another embodiment of the first ventilation groove and the second ventilation groove of the present invention.
[0034] Component number description
[0035] DETAILED DESCRIPTION
[0036] The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.
[0037] See also Figures 1 to 8 . It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.
[0038] The following embodiments are only for illustration purposes and can be combined with each other, and are not limited to the contents presented in the following single embodiments.
[0039] In this embodiment, please refer to Figures 2 to 8 A tooth tip sealing structure of a moving and stationary scroll 1 comprises: a stationary scroll 1 and a moving scroll 2, wherein the stationary scroll 1 is arranged on a stationary disk, and the moving scroll 2 is arranged on a moving disk, wherein the stationary scroll 1 is provided with a first tooth tip sealing groove 12 and a first sealing strip 121 arranged in the first tooth tip sealing groove 12; the stationary scroll 1 and the moving scroll 2 have opposite rotation directions and can cooperate to form a plurality of compression chambers, as shown in the specific Figure 2As shown, when the movable scroll 2 and the static scroll 1 rotate relative to each other, they can form compression chambers 1A, 1B, 2A, and 2B. The compression chambers 1A, 1B, 2A, and 2B change dynamically during the rotation of the movable scroll 2. The compressed air in the compression chambers 1A, 1B, 2A, and 2B is discharged from the exhaust port 11 after being compressed. The movable scroll 2 is provided with a second tooth top sealing groove 21 and a second sealing strip 211 placed in the second tooth top sealing groove 21. The bottom of the second tooth top sealing groove 21 is provided with a second ventilation groove 212 along the rotation direction of the movable scroll 2. The second ventilation groove 212 is connected to the exhaust port 11 of the static scroll 1. The movable disk is provided with the movable scroll 2 on one side, and the center of the other side of the movable disk is provided with a medium pressure chamber 20. The bottom of the second ventilation groove 212 is provided with at least one back pressure hole 2121, and the back pressure hole 2121 is connected to the medium pressure chamber 20. The back pressure hole 2121 can be one as shown in the figure, or it can be two or more. The traditional high pressure is directly throttled to medium pressure and introduced into the medium pressure chamber 20. The pressure is changed by intermittently connecting the exhaust port of the static scroll 1 through the second ventilation groove 212 of the movable scroll 2. The high pressure is throttled to medium pressure through the throttling of the second scroll tooth top sealing groove 21 and introduced into the medium pressure chamber 20 through the back pressure hole 2121 in the groove. When the back pressure is too large, the degree of fit between the moving and static vortices is high, which reduces the gap between the second sealing strip 211 and the second tooth top sealing groove 21 and the second ventilation groove 212, thereby increasing the throttling effect, reducing the intermediate pressure, moving the moving vortex 2 away from the static vortex 1, reducing the contact force between the moving and static vortices, reducing wear and power consumption, and improving the performance of the compressor; when the back pressure is too small, the degree of fit between the moving and static vortices is low, which increases the gap between the second sealing strip 211 and the second tooth top sealing groove 21 and the second ventilation groove 212, thereby reducing the throttling effect, increasing the intermediate pressure, moving the moving vortex 2 close to the static vortex 1, increasing the contact force between the moving and static vortices, reducing compression chamber leakage, and improving the performance of the compressor. The exhaust port 11 can be located at the center of the static scroll 1, and the high-pressure gas in the compression chamber 1A, compression chamber 1B, compression chamber 2A, and compression chamber 2B is passed from the exhaust port 11 into the second ventilation groove 212, so that the high-pressure gas can generate a push-out force on the second sealing strip 211, thereby making the sealing effect of the first sealing strip 121 and the second sealing strip 211 better. Optionally, in order to ensure the floating effect of the tooth top sealing strip and the performance of the compressor, the cross-sectional area S1 of the second ventilation groove and the area S2 of the exhaust port, S1<1 / 5S2. In order to further ensure its floating effect, optionally, within the period of one relative rotation of the moving scroll and the static scroll, the conduction time length of the second ventilation groove and the exhaust port is not more than 3 / 4 of a circle.
[0040] In this embodiment, please refer to Figures 2 to 8A tooth tip sealing structure of a moving and stationary scroll 1 comprises: a stationary scroll 1 and a moving scroll 2, wherein the stationary scroll 1 is provided with a first tooth tip sealing groove 12 and a first sealing strip 121 disposed in the first tooth tip sealing groove 12; a first ventilation groove 122 is provided at the bottom of the first tooth tip sealing groove 12 along the rotation direction of the stationary scroll 1, and the first ventilation groove 122 is connected to the exhaust port 11 of the stationary scroll 1; the stationary scroll 1 and the moving scroll 2 have opposite rotation directions and can cooperate to form a plurality of compression chambers, specifically as follows Figure 2As shown, when the movable scroll 2 and the static scroll 1 rotate relative to each other, compression chambers 1A, 1B, 2A and 2B can be formed. Compression chambers 1A, 1B, 2A and 2B change dynamically during the rotation of the movable scroll 2. The compressed air in compression chambers 1A, 1B, 2A and 2B is discharged from the exhaust port 11 after being compressed. A second tooth top sealing groove 21 is provided on the movable scroll 2. A second ventilation groove 212 and a second sealing strip 211 disposed in the second ventilation groove 212 are provided at the bottom of the second tooth top sealing groove 21 along the rotation direction of the movable scroll 2. The second ventilation groove 212 is connected to the exhaust port 11 of the static scroll 1. A medium pressure chamber 20 is provided at the center of a side of the movable scroll 2 away from the static scroll 1. At least one back pressure hole 2121 is provided at the bottom of the second ventilation groove 212. The back pressure hole 2121 is connected to the medium pressure chamber. The back pressure hole 2121 may be one of the diagrams, or two or more, and the traditional high pressure is directly throttled to medium pressure and introduced into the medium pressure chamber 20. The pressure is changed to be intermittently connected to the exhaust port of the static scroll 1 through the second ventilation groove 212 of the movable scroll 2, and the high pressure is throttled to medium pressure through the throttling of the second scroll tooth top sealing groove 21 and introduced into the medium pressure chamber 20 through the back pressure hole 2121 in the groove. When the back pressure is too large, the dynamic and static scrolls are highly fitted, so that the gap between the second sealing strip 211 and the second ventilation groove 212 is reduced, thereby increasing the throttling effect, reducing the medium pressure, and the movable scroll 2 moves away from the static scroll 1, and the contact force between the dynamic and static scrolls is reduced, thereby reducing wear and power consumption and improving the performance of the compressor; when the back pressure is too small, the dynamic and static scrolls are poorly fitted, so that the gap between the second sealing strip 211 and the second ventilation groove 212 is increased, thereby reducing the throttling effect, increasing the medium pressure, and the movable scroll 2 moves close to the static scroll 1, and the contact force between the movable and static scrolls is increased, thereby reducing the leakage of the compression chamber and improving the performance of the compressor. The exhaust port 11 can be located at the center of the static scroll 1, and the high-pressure gas in the compression chamber 1A, the compression chamber 1B, the compression chamber 2A, and the compression chamber 2B is passed from the exhaust port 11 into the first ventilation groove 122 and the second ventilation groove 212, so that the high-pressure gas can generate a push-out force on the first sealing strip 121 and the second sealing strip 211, respectively, so that the sealing effect of the first sealing strip 121 and the second sealing strip 211 is better. Optionally, in order to ensure the floating effect of the tooth top sealing strip and the performance of the compressor, the total cross-sectional area S1 of the first ventilation groove, the total cross-sectional area S3 of the first ventilation groove, and the area S2 of the exhaust port, S1<1 / 5S2, and S3<1 / 5S2. In order to further ensure its floating effect, optionally, within the period of one relative rotation of the movable scroll and the static scroll, the conduction time length of the first ventilation groove, the second ventilation groove and the exhaust port is not more than 3 / 4 of a circle.
[0041] In this embodiment, please refer to Figure 7, the groove width of the first ventilation groove 122 is smaller than the groove width of the first tooth top sealing groove 12, and the groove width of the second ventilation groove 212 is smaller than the groove width of the second tooth top sealing groove 21. Optionally, the first ventilation groove 122 is a square groove, and the first ventilation groove 122 and the first tooth top sealing groove 12 form a T-shaped structure, and the second ventilation groove 212 is a square groove, and the second ventilation groove 212 and the second tooth top sealing groove 21 form a T-shaped structure.
[0042] By setting the groove width of the first ventilation groove 122 to be smaller than the groove width of the first tooth top sealing groove 12, it is possible to avoid the first sealing strip from sinking, and at the same time it is possible to ensure that the high pressure gas can exert a force on the first sealing strip 121, thereby ensuring the floating sealing effect of the first sealing strip 121 and the second sealing strip 211. By setting the groove width of the second ventilation groove 212 to be smaller than the groove width of the second tooth top sealing groove 21, it is possible to avoid the second sealing strip from sinking, and at the same time it is possible to ensure that the high pressure gas can exert a force on the second sealing strip 211, thereby ensuring the floating sealing effect of the first sealing strip 121 and the second sealing strip 211.
[0043] In this embodiment, please refer to Figure 8 , the width of the first ventilation groove 122 is smaller than the width of the first tooth top sealing groove 12, and the width of the second ventilation groove 212 is smaller than the width of the second tooth top sealing groove 21. Optionally, the first ventilation groove 122 is an arc-shaped groove, the first ventilation groove 122 and the first tooth top sealing groove 12 form a U-shaped structure, and the second ventilation groove 212 is an arc-shaped groove, and the second ventilation groove 212 and the second tooth top sealing groove 21 form a U-shaped structure. By setting the width of the first ventilation groove 122 smaller than the width of the first tooth top sealing groove 12, it is possible to avoid the first sealing strip from sinking, and at the same time, it is possible to ensure that the high-pressure gas can exert a push-out force on the first sealing strip 121, thereby ensuring the floating sealing effect of the first sealing strip 121 and the second sealing strip 211. By setting the groove width of the second vent groove 212 smaller than the groove width of the second tooth top sealing groove 21, the second seal strip can be prevented from sinking, and at the same time, it can ensure that the high-pressure gas can exert a force on the second sealing strip 211, thereby ensuring the floating sealing effect of the first sealing strip 121 and the second sealing strip 211. The U-shaped structure is formed, which is convenient for processing. The second tooth top sealing groove 21 and the second vent groove 212 can be processed in one process, and the first tooth top sealing groove 12 and the first vent groove 122 can be processed in one process.
[0044] In this embodiment, please refer to Figure 1A compressor, comprising the tooth top sealing structure of the moving and stationary scroll 1 described in any one of the above embodiments or the combined embodiments; the stationary scroll 1 is mounted on the stationary disk, the moving scroll 2 is mounted on the moving disk, and also comprises a cylinder body 3, a stator 4 mounted in the cylinder body 3, a rotor 5 mounted in the stator 4, an eccentric shaft 6 fixedly sleeved on the rotor 5, and a faceplate 7 fixed at one end of the eccentric shaft 6; the moving scroll 2 is mounted on the faceplate 7 through an anti-rotation ring 71 and an anti-rotation pin 72, and the stationary scroll 1 is fixedly mounted in the cylinder body 3. When power is turned on, the rotor 5 rotates in the stator 4, thereby driving the eccentric shaft 6 to rotate, the eccentric shaft 6 drives the faceplate 7 to rotate, and the faceplate 7 drives the moving scroll 2 to rotate.
[0045] In summary, the present invention changes the original feedback-free open-loop back pressure structure into a closed-loop back pressure structure, and can adaptively adjust the pressure of the medium pressure chamber to achieve the appropriate contact force of the dynamic and static vortex, reduce the wear and leakage of the compressor components, and thus improve the performance of the compressor; due to the use of the adaptive adjustment back pressure structure, the compressor can obtain the appropriate back pressure pressure and dynamic and static vortex contact force throughout the entire operating range, reduce the wear of the compressor, and improve the reliability of the compressor; due to the use of the adaptive adjustment back pressure structure, the compressor can obtain the appropriate back pressure pressure and dynamic and static vortex contact force throughout the entire operating range, and improve the performance of the compressor; due to the use of the adaptive adjustment back pressure structure, the compressor can obtain the appropriate back pressure pressure and dynamic and static vortex contact force throughout the entire operating range, and improve the operating range of the compressor. Therefore, the present invention effectively overcomes the various shortcomings in the prior art and has a high industrial utilization value.
[0046] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.
Claims
1. A dynamic and static scroll adaptive back pressure structure, characterized in that: include: A stationary scroll is arranged on the stationary disk, wherein the stationary scroll is provided with a first tooth tip sealing groove and a first sealing strip arranged in the first tooth tip sealing groove; A movable scroll is arranged on the movable plate, the fixed scroll and the movable scroll rotate in opposite directions and can cooperate to form a plurality of compression chambers, and the movable scroll is provided with a second tooth top sealing groove and a second sealing strip arranged in the second tooth top sealing groove; A second ventilation groove is provided at the bottom of the second tooth tip sealing groove along the rotation direction of the movable scroll, and the second ventilation groove is connected to the exhaust port of the fixed scroll; The movable vortex is disposed on one side of the movable disk, a medium-pressure cavity is disposed at the center of the other side of the movable disk, and at least one back-pressure hole is disposed at the bottom of the second ventilation groove, and the back-pressure hole is connected to the medium-pressure cavity; A first ventilation groove is provided at the bottom of the first tooth tip sealing groove along the rotation direction of the static scroll, and the first ventilation groove is connected to the exhaust port of the static scroll; The total cross-sectional area of the first ventilation grooves is less than one fifth of the area of the exhaust port. The cross-sectional area of the second ventilation groove is less than one fifth of the area of the exhaust port; In a period of one relative rotation of the movable scroll and the stationary scroll, the conduction time length between the first ventilation groove and the exhaust port is no more than 3 / 4 of a circle, and the conduction time length between the second ventilation groove and the exhaust port is no more than 3 / 4 of a circle.
2. The dynamic and static scroll adaptive back pressure structure according to claim 1 is characterized in that: The groove width of the first ventilation groove is smaller than the groove width of the first tooth tip sealing groove, and the groove width of the second ventilation groove is smaller than the groove width of the second tooth tip sealing groove.
3. The dynamic and static vortex adaptive back pressure structure according to claim 2 is characterized in that: The first ventilation groove is a square groove, and the first ventilation groove and the first tooth top sealing groove form a T-shaped structure. The second ventilation groove is a square groove, and the second ventilation groove and the second tooth top sealing groove form a T-shaped structure.
4. The dynamic and static scroll adaptive back pressure structure according to claim 2 is characterized in that: The first ventilation groove is an arc-shaped groove, and the first ventilation groove and the first tooth top sealing groove form a U-shaped structure. The second ventilation groove is an arc-shaped groove, and the second ventilation groove and the second tooth top sealing groove form a U-shaped structure.
5. A compressor, characterized in that: It comprises the dynamic and static vortex adaptive back pressure structure as described in any one of claims 1-4.