CN107559204B - Compression mechanism of rotary compressor and rotary compressor - Google Patents
Compression mechanism of rotary compressor and rotary compressor Download PDFInfo
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- CN107559204B CN107559204B CN201710752343.7A CN201710752343A CN107559204B CN 107559204 B CN107559204 B CN 107559204B CN 201710752343 A CN201710752343 A CN 201710752343A CN 107559204 B CN107559204 B CN 107559204B
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Abstract
The invention discloses aA compression mechanism of a rotary compressor and a rotary compressor, the compression mechanism includes: at least one cylinder and at least one exhaust valve block, be formed with the working chamber in every cylinder and correspond at least one exhaust hole, the exhaust valve block is used for switching exhaust hole, the rigidity K (N/mm) of exhaust valve block equals in numerical value: when the projection point of the central axis of the exhaust hole on the exhaust valve plate rises by 1mm, the magnitude of the concentrated force in the axial direction of the central axis of the exhaust hole is required to be applied to the projection point, and the sum V of the volumes of all working cavities sum (mm 3 ) Sum of rigidity K of all exhaust valve plates sum (N/mm) satisfying: 400mm 4 /N≤V sum /K sum ≤3000mm 4 N. Therefore, through the cooperation of the exhaust hole and the exhaust valve plate, the exhaust resistance loss of the compression mechanism can be reduced, the energy of the rotary compressor can be improved, and the working reliability of the exhaust valve plate can be improved.
Description
Technical Field
The invention relates to the technical field of compressors, in particular to a compression mechanism of a rotary compressor and the rotary compressor with the compression mechanism of the rotary compressor.
Background
In the related art, the rotary compressor is increasingly moving toward miniaturization and high-speed development, and the maximum rotation speed is increased from 120rps to 180rps and above. The higher the rotating speed is, the more gas is discharged in unit time, the more gas thrust is received by the exhaust valve plate, and the more easily the exhaust valve plate is delayed to be closed, so that high-pressure gas flows back, and the volumetric efficiency and performance of the compressor are affected. Delayed closing of the discharge valve plate also causes noise deterioration, and when the delayed closing of the discharge valve plate is serious, the discharge valve plate rebounds at a high speed to impact the valve seat to generate fatigue fracture, so that the compressor fails to work.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems in the related art to some extent. Therefore, the invention provides a compression mechanism of a rotary compressor, which can reduce the exhaust resistance loss of the compression mechanism and also can reduce the noise generated in the operation process of the compression mechanism.
The invention further provides a rotary compressor.
The compression mechanism of the rotary compressor according to the present invention includes: at least one cylinder and at least one exhaust valve plate, each cylinder is internally provided with a working cavity and corresponds to the working cavityAt least one vent hole, the vent valve block is used for opening and closing the vent hole, the rigidity K (N/mm) of the vent valve block equals in numerical value: when the projection point of the central axis of the exhaust hole on the exhaust valve plate rises by 1mm, the application direction of the projection point is the magnitude of the concentrated force in the axial direction of the central axis of the exhaust hole, and the sum V of the volumes of all the working cavities sum (mm 3 ) Sum K of rigidity of all the exhaust valve plates sum (N/mm) satisfying: 400mm 4 /N≤V sum /K sum ≤3000mm 4 /N。
According to the compression mechanism of the rotary compressor, the exhaust hole is matched with the exhaust valve plate, so that the exhaust resistance loss of the compression mechanism can be reduced, the energy of the rotary compressor can be improved, and the working reliability of the exhaust valve plate can be improved.
Optionally, the compression mechanism of the rotary compressor further includes: the first bearing and the second bearing are arranged at two axial ends of the at least one cylinder, and the exhaust hole is arranged on the first bearing and/or the second bearing.
Further, the compression mechanism of the rotary compressor further includes: further comprises: the muffler is arranged on the end face, far away from the second bearing, of the first bearing, and is provided with a silencing cavity which can be communicated with the working cavity through the exhaust hole.
Specifically, the cylinder is a plurality of and a plurality of the cylinder sets up side by side in proper order along the axial, compression mechanism still includes: the first partition plate is arranged between two adjacent cylinders, and the exhaust holes are formed in the first partition plate and correspond to at least one of the two cylinders.
Optionally, the compression mechanism of the rotary compressor further includes: and the second partition plate is arranged in the cylinder and divides the internal space of the cylinder into a plurality of working cavities.
Further, each exhaust valve plate is provided with a lift limiter and a fixing piece, a first mounting hole is formed in each exhaust valve plate, a second mounting hole is formed in each lift limiter, and the fixing piece penetrates through the first mounting hole and the second mounting hole to fix the exhaust valve plate with the lift limiter.
Specifically, the distance from the exhaust hole to the first mounting hole is L (mm), and the distance from the second mounting hole to the bending section of the lift limiter is L 1 (mm), the width of discharge valve block waist is B (mm), the thickness of discharge valve block is T (mm), the material elastic modulus of discharge valve block is E (N/mm 2), the rigidity K (N/mm) of discharge valve block is calculated through following formula:
optionally, the exhaust hole is opened on the inside wall of the cylinder, and the exhaust valve plate corresponding to the exhaust hole is fixed on the cylinder.
Further, the thickness T of the exhaust valve plate is larger than 0.4mm.
Further, the refrigerant in the working chamber is a carbon dioxide refrigerant.
Further, the elastic modulus of the material for manufacturing the exhaust valve plate is not less than 2.2×10 5 (N/mm 2 )。
The rotary compressor comprises the compression mechanism of the rotary compressor.
Drawings
FIG. 1 is a cross-sectional view of a compression mechanism according to an embodiment of the present invention;
FIG. 2 is a cross-sectional view of a cylinder and piston assembly;
FIG. 3 is a cross-sectional view of the exhaust valve plate when closed;
FIG. 4 is a cross-sectional view of the discharge valve plate when open;
FIG. 5 is a cross-sectional view of the assembled exhaust valve, retainer, mount and cylinder;
FIG. 6 is a cross-sectional view of the stop;
FIG. 7 is a cross-sectional view of the discharge valve plate;
FIG. 8 is a top view of the discharge valve plate;
FIG. 9 is a diagram of the refrigeration efficiency and V of a compression mechanism according to one embodiment of the present invention sum /K sum Graph of the curve relationship between the two.
Reference numerals:
a compression mechanism 10;
a cylinder 1; an exhaust hole 11; an exhaust valve sheet 12; a first mounting hole 121; a first bearing 2; a second bearing 3; a muffler 4; a working chamber 5; a lift limiter 7; a second mounting hole 71; and a fixing member 8.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
A compression mechanism 10 of a rotary compressor of a seat according to an embodiment of the present invention will be described in detail with reference to fig. 1 to 9.
As shown in fig. 1 to 5, 7 and 8, a compression mechanism 10 according to an embodiment of the present invention includes: at least one cylinder 1 and at least one exhaust valve plate 12, a working chamber 5 is formed in each cylinder 1, wherein the refrigerant in the working chamber 5 can be carbon dioxide refrigerant. Moreover, each working chamber 5 is correspondingly provided with at least one exhaust hole 11, gas in the working chamber 5 can be exhausted to the outside of the cylinder 1 through the exhaust holes 11, each exhaust hole 11 is provided with an exhaust valve plate 12, the exhaust valve plate 12 is used for opening and closing the exhaust holes 11, and the rigidity K (N/mm) of the exhaust valve plate 12 is equal to the following value: when the projection point of the central axis of the exhaust hole 11 on the exhaust valve plate 12 is raised by 1mm, the magnitude of the concentrated force in the axial direction of the central axis of the exhaust hole 11 needs to be applied to the projection point, and the sum V of the volumes of all the working chambers 5 sum (mm 3 ) Sum K of rigidity with all the exhaust valve plates 12 sum (N/mm) satisfying: 400mm 4 /N≤V sum /K sum ≤3000mm 4 /N。
The compression mechanism 10 uses an eccentric rotor to act as a piston to compress refrigerant gas, a rotating crankshaft is coaxial with the cylinder 1 shaft, an eccentric wheel is arranged on the rotating crankshaft, a thin-wall elastic sleeve rotor supported by high-quality steel is arranged on the eccentric wheel to form an eccentric rotating piston, one side of the eccentric rotating piston is always in close contact with the inner side wall of the cylinder 1, and a working cavity 5 is formed between the outer surface of the eccentric rotating piston and the inner side wall of the cylinder 1. When the rotating speed of the rotary compressor is greater than or equal to 180rps, on the premise that the structure of the existing working cavity 5 is unchanged, the high-speed operation of the compression mechanism 10 is realized by adjusting the value range of the rigidity K of the exhaust valve plate 12, so that the working reliability of the exhaust valve plate 12 can be improved.
Wherein, when the rotating speed is 120rps, V is used for ensuring the high-efficiency and reliable operation of the rotary compressor sum /K sum The range of the value of (C) is 5000mm 4 /N≤V sum /K sum ≤20000mm 4 N. When the rotation speed of the rotary compressor is increased, in order to ensure that the exhaust valve plate 12 closes the exhaust hole 11 in time and avoid gas backflow, the rigidity of the exhaust valve plate 12 needs to be increased, V sum /K sum Reduction is required. Let us assume a volume of 6000mm in the working chamber 5 3 Under the condition of 180rps of rotating speed, three-dimensional fluid-solid coupling simulation calculation is carried out, and the result shows that when V sum /K sum The range of the value of (C) is 400mm 4 /N≤V sum /K sum ≤3000mm 4 at/N, the performance of the rotary compressor is highest, so that the energy efficiency of the rotary compressor can be improved.
In addition, by limiting the ratio between the sum of the volumes of all the working chambers 5 and the sum of the rigidities of all the discharge valve plates 12 to a specified value range, the discharge resistance loss of the compression mechanism 10 can be reduced when the rotation speed of the compression mechanism 10 is rotated at a high speed.
Optionally, as shown in fig. 1, the compression mechanism 10 may further include: the first bearing 2 and the second bearing 3, the first bearing 2 and the second bearing 3 are disposed at both axial ends of at least one cylinder 1, that is, the first bearing 2 and the second bearing 3 may be disposed at both axial ends of two or more cylinders 1, the exhaust hole 11 may be disposed on the first bearing 2 and/or the second bearing 3, in other words, the exhaust hole 11 may be disposed on the first bearing 2 alone, or on the second bearing 3 alone, or may be disposed on both the first bearing 2 and the second bearing 3.
Wherein, the first bearing 2 and the second bearing 3 are respectively attached to two outer side end surfaces of the cylinder 1, the outer side end surfaces are provided with axial openings of the working cavity 5, a first sealing surface is formed in a region corresponding to the axial openings of the first bearing 2, a second sealing surface is formed in a region corresponding to the axial openings of the second bearing 3, wherein, the exhaust hole 11 is arranged on the first sealing surface or the second sealing surface or both the first sealing surface and the second sealing surface, the exhaust valve plate 12 corresponding to the exhaust hole 11 is fixedly arranged on the first bearing 2 or the second bearing 3 corresponding to the exhaust hole 11 or both the first bearing 2 and the second bearing 3, thereby realizing the discharge of compressed gas of the rotary compressor.
The exhaust hole 11 may be provided in one or more of the first sealing surfaces, and the exhaust hole 11 may be provided in the first sealing surface and the second sealing surface. Corresponding to the exhaust hole 11, the exhaust valve plate 12 may be provided in one piece, and may be provided on the first bearing, and the exhaust valve plate 12 may be provided in plurality, and may be provided on the first bearing 2 and the second bearing 3, respectively. By increasing the number of the exhaust holes 11 and the exhaust valve sheet 12, the exhaust resistance loss can be reduced, and the total rigidity Ksum of the exhaust valve sheet 12 can also be increased.
Further, as shown in fig. 1, the compression mechanism 10 may further include: the muffler 4, muffler 4 set up on the terminal surface that second bearing 3 was kept away from to first bearing 2, and muffler 4 is provided with the amortization chamber, and the amortization chamber can be through exhaust hole 11 and working chamber 5 intercommunication, and the amortization chamber has the effect of amortization, and gas can follow the exhaust hole 11 from working chamber 5 and arrange to the amortization chamber, discharges after the amortization of amortization chamber to can reduce the exhaust noise, also can promote the performance of compressing mechanism 10.
Specifically, the plurality of cylinders 1 are provided, and moreover, the plurality of cylinders 1 are provided side by side in order in the axial direction, the compression mechanism 10 may further include: and a first partition plate arranged between two adjacent cylinders 1, wherein the first partition plate is provided with an exhaust hole 11, and the exhaust hole 11 corresponds to at least one of the two cylinders 1.
When the number of the cylinders 1 is greater than or equal to two, the areas corresponding to the axial openings on both sides of the first partition plate form a third sealing surface and a fourth sealing surface, and the exhaust hole 11 can be arranged on the third sealing surface, the fourth sealing surface and the third sealing surface at the same time, so that the function of exhausting air from the middle part of the compression mechanism 10 can be realized.
Optionally, the compression mechanism 10 may further include: the second baffle, the second baffle sets up in cylinder 1, and the second baffle separates into a plurality of working chambers 5 with cylinder 1 inner space, is provided with eccentric rotary piston in arbitrary working chamber 5, can further promote the performance of compression mechanism 10 like this.
Further, as shown in fig. 5 to 8, each exhaust valve plate 12 is configured with a lift limiter 7 and a fixing member 8, a first mounting hole 121 is formed in the exhaust valve plate 12, a second mounting hole 71 is formed in the lift limiter 7, and the fixing member 8 passes through the first mounting hole 121 and the second mounting hole 71 to fix the exhaust valve plate 12 and the lift limiter 7, so that the positions of the lift limiter 7 and the exhaust valve plate 12 can be fixedly mounted together, thereby improving the structural strength of the compression mechanism 10, and further ensuring the working reliability of the compression mechanism 10.
Specifically, as shown in fig. 3 to 4, the distance from the exhaust hole 11 to the first mounting hole 121 is L (mm), the distance from the second mounting hole 71 to the curved section of the lift limiter 7 is L1 (mm), the width of the waist of the exhaust valve sheet 12 is B (mm), the thickness of the exhaust valve sheet 12 is T (mm), and the elastic modulus of the material of the exhaust valve sheet 12 is E (N/mm) 2 ) The stiffness K (N/mm) of the discharge valve plate 12 is calculated by the following formula:wherein the elastic modulus Edesign of the material of the exhaust valve plate 12 is more than 2.2 multiplied by 105 (N/mm) 2 ) By employing the discharge valve sheet 12 having a larger material elastic modulus, the rigidity K of the discharge valve sheet 12 can be increased.
Alternatively, the exhaust hole 11 is opened in the cylinder 1The exhaust valve plate 12 corresponding to the exhaust hole 11 is fixed on the cylinder 1 on the side wall, so that the exhaust resistance loss can be further reduced by opening the exhaust hole 11 and the exhaust valve plate 12 while the strength of the compression mechanism 10 is ensured, and the total rigidity K of the exhaust valve plate 12 can be further increased sum 。
Further, the thickness T of the discharge valve plate 12 is designed to be greater than 0.4mm, and the rigidity K of the discharge valve plate 12 can be increased by using a discharge valve plate 12 having a larger thickness.
FIG. 9 shows the refrigerating efficiency and V of the compression mechanism according to an embodiment of the present invention sum /K sum Graph of the curve relationship between the two. Let us assume a volume of 6000mm in the working chamber 5 3 Under the condition of 180rps of rotating speed, three-dimensional fluid-solid coupling simulation calculation is carried out, and the result shows that when V sum /K sum In the range of 400mm 4 /N≤V sum /K sum ≤3000mm 4 at/N, the COP (refrigeration efficiency) is highest, i.e. the performance of the rotary compressor is highest, while when V sum /K sum 4000mm or more 4 at/N, the discharge valve plate 12 breaks and the rotary compressor fails.
The rotary compressor according to the embodiment of the invention comprises the compression mechanism 10 of the embodiment, and the compression mechanism 10 is arranged on the rotary compressor, so that the compression mechanism 10 can improve the energy efficiency of the rotary compressor and reduce the exhaust noise of the rotary compressor.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
Claims (10)
1. A compression mechanism of a rotary compressor, comprising:
at least one cylinder, each cylinder is internally provided with a working cavity and corresponds to at least one exhaust hole;
at least one air discharge valve plate for opening and closing the air discharge hole, the rigidity K (N/mm) of the air discharge valve plate being equal in value to: when the projection point of the central axis of the exhaust hole on the exhaust valve plate rises by 1mm, the application direction of the projection point is the magnitude of the concentrated force in the axial direction of the central axis of the exhaust hole, and the sum V of the volumes of all the working cavities sum （mm 3 ) Sum K of rigidity of all the exhaust valve plates sum (N/mm) satisfying:
400 mm 4 /N≤V sum /K sum ≤3000 mm 4 /N；
each exhaust valve plate is provided with a lift limiter and a fixing piece, a first mounting hole is formed in each exhaust valve plate, a second mounting hole is formed in each lift limiter, and each fixing piece penetrates through each first mounting hole and each second mounting hole to fix the exhaust valve plate and each lift limiter;
the distance from the exhaust hole to the first mounting hole is L (mm), and the distance from the second mounting hole to the bending section of the lift limiter is L 1 (mm), the width of the waist of the exhaust valve plate is B (mm), the thickness of the exhaust valve plate is T (mm), and the elastic modulus of the exhaust valve plate material is E (N/mm) 2 ) The rigidity K (N/mm) of the exhaust valve plate is calculated by the following formula:
。
2. the compression mechanism of a rotary compressor of claim 1, further comprising: the first bearing and the second bearing are arranged at two axial ends of the at least one cylinder, and the exhaust hole is arranged on the first bearing and/or the second bearing.
3. The compression mechanism of a rotary compressor of claim 2, further comprising: the muffler is arranged on the end face, far away from the second bearing, of the first bearing, and is provided with a silencing cavity which can be communicated with the working cavity through the exhaust hole.
4. The compression mechanism of claim 1, wherein the plurality of cylinders are arranged side by side in sequence in the axial direction, the compression mechanism further comprising: the first partition plate is arranged between two adjacent cylinders, and the exhaust holes are formed in the first partition plate and correspond to at least one of the two cylinders.
5. The compression mechanism of a rotary compressor of claim 1, further comprising: and the second partition plate is arranged in the cylinder and divides the internal space of the cylinder into a plurality of working cavities.
6. The compression mechanism of a rotary compressor of claim 1, wherein the discharge hole is opened on an inner sidewall of the cylinder, and the discharge valve plate corresponding to the discharge hole is fixed on the cylinder.
7. The compression mechanism of a rotary compressor of claim 1, wherein the thickness T of the discharge valve plate is greater than 0.4mm.
8. The compression mechanism of claim 1, wherein the refrigerant in the working chamber is a carbon dioxide refrigerant.
9. The compression mechanism of a rotary compressor according to claim 1, wherein the material of which the discharge valve plate is made has an elastic modulus of not less than 2.2 x 10 5 (N/mm 2 )。
10. A rotary compressor comprising a compression mechanism of a rotary compressor according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710752343.7A CN107559204B (en) | 2017-08-28 | 2017-08-28 | Compression mechanism of rotary compressor and rotary compressor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710752343.7A CN107559204B (en) | 2017-08-28 | 2017-08-28 | Compression mechanism of rotary compressor and rotary compressor |
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| Publication Number | Publication Date |
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| CN107559204A CN107559204A (en) | 2018-01-09 |
| CN107559204B true CN107559204B (en) | 2023-07-28 |
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| CN201710752343.7A Active CN107559204B (en) | 2017-08-28 | 2017-08-28 | Compression mechanism of rotary compressor and rotary compressor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108105091B (en) * | 2018-02-02 | 2023-11-24 | 广东美芝制冷设备有限公司 | Compression mechanism and compressor with same |
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| JP4858047B2 (en) * | 2006-09-28 | 2012-01-18 | ダイキン工業株式会社 | Compressor |
| JP2011064183A (en) * | 2009-09-18 | 2011-03-31 | Toshiba Carrier Corp | Multicylinder rotary compressor |
| CN103939375B (en) * | 2014-04-24 | 2016-02-17 | 广东美芝制冷设备有限公司 | For compressor exhaust gear and there is the compressor of this exhaust gear |
| CN205370997U (en) * | 2016-02-02 | 2016-07-06 | 广东美芝制冷设备有限公司 | Discharge valve piece of compressor and have its compressor |
| CN207178221U (en) * | 2017-08-28 | 2018-04-03 | 广东美芝制冷设备有限公司 | The compression mechanism and rotary compressor of rotary compressor |
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