CN210949113U - Two-stage screw compressor and air conditioning unit - Google Patents
Two-stage screw compressor and air conditioning unit Download PDFInfo
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- CN210949113U CN210949113U CN201921396372.5U CN201921396372U CN210949113U CN 210949113 U CN210949113 U CN 210949113U CN 201921396372 U CN201921396372 U CN 201921396372U CN 210949113 U CN210949113 U CN 210949113U
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- 238000004378 air conditioning Methods 0.000 title claims abstract description 12
- 230000006835 compression Effects 0.000 claims abstract description 75
- 238000007906 compression Methods 0.000 claims abstract description 75
- 230000006698 induction Effects 0.000 claims description 16
- 239000012530 fluid Substances 0.000 abstract description 3
- 238000000034 method Methods 0.000 abstract description 3
- 230000008569 process Effects 0.000 abstract description 3
- 238000004891 communication Methods 0.000 description 6
- 230000008878 coupling Effects 0.000 description 5
- 238000010168 coupling process Methods 0.000 description 5
- 238000005859 coupling reaction Methods 0.000 description 5
- 230000009467 reduction Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 238000001125 extrusion Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
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Abstract
The utility model provides a doublestage helical-lobe compressor and air conditioning unit. The double-stage screw compressor comprises a communicating pipeline, and a low-pressure stage compression cavity, a motor cavity and a high-pressure stage compression cavity which are sequentially arranged in parallel. The utility model provides a doublestage screw compressor and air conditioning unit, adopt the intercommunication pipeline to carry out the secondary compression with the exhaust drainage in low pressure stage compression chamber to high pressure stage compression intracavity, the exhaust of low pressure stage compression chamber flows into the high pressure stage compression intracavity behind the motor chamber and causes fluid temperature to rise and compress the problem that the ratio descends when having overcome among the prior art when needing, and then make the low pressure stage rotor opposite to the axial force direction that receives with the high pressure stage rotor axial force direction that receives, utilize offsetting each other of two axial forces, reduce doublestage screw compressor's whole axial atress, effectively reduce the vibration noise that produces among the operation process.
Description
Technical Field
The utility model relates to a compressor arrangement technical field, especially a doublestage screw compressor and air conditioning unit.
Background
The double-stage screw compressor is suitable for the working condition range of a large pressure ratio, the pressure is decomposed by adopting the two groups of rotors, the single-stage pressure ratio is reduced, the volumetric efficiency and the heat insulation efficiency can be greatly improved, and the compressor energy efficiency becomes a hotspot of the current compressor development due to the single-stage compressor under the same working condition. In the design of a traditional single-machine two-stage compressor, low-pressure stage exhaust directly enters a high-pressure stage from a motor cavity to be subjected to secondary compression, rotors are generally arranged in the same air suction and exhaust directions, however, the stress of the rotors points to an air suction end from an exhaust end, so that the whole stress of the two-stage screw compressor is that the high-pressure stage exhaust points to the low-pressure stage air suction, the stress of a rotor shaft system is unbalanced, and vibration noise is large during operation.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problems that low-pressure stage exhaust of the existing two-stage screw compressor passes through a motor cavity and axial force borne by two stages of screws points to the same direction, the two-stage screw compressor and the air conditioning unit are provided with a communication pipeline, and the stress direction of a high-pressure stage rotor pair is opposite to that of a low-pressure stage rotor pair.
The utility model provides a doublestage screw compressor, includes the intercommunication pipeline and the low pressure stage compression chamber, motor chamber and the high pressure stage compression chamber that set up side by side in proper order, the low pressure stage compression chamber with the motor chamber with the high pressure stage compression chamber with the motor chamber is all sealed to be set up, the one end of intercommunication pipeline with the gas vent intercommunication in low pressure stage compression chamber, the other end with the induction port intercommunication in high pressure stage compression chamber, just the gas flow direction in the low pressure stage compression chamber with the gas flow opposite direction in the high pressure stage compression chamber.
The low-pressure stage compression cavity is internally provided with a low-pressure stage rotor pair, the high-pressure stage compression cavity is internally provided with a high-pressure stage rotor pair, and the rotating direction of the low-pressure stage rotor pair is opposite to that of the high-pressure stage rotor pair.
The low pressure stage compression chamber is close to the one end in motor chamber is provided with the low pressure stage induction port, keeps away from the one end in motor chamber is provided with the low pressure stage gas vent, the intercommunication pipeline with the low pressure stage gas vent intercommunication, the gas flow direction in the low pressure stage compression chamber by the low pressure stage induction port extremely the low pressure stage gas vent.
The high-pressure stage compression chamber is close to the one end in motor chamber is provided with the high-pressure stage induction port, keeps away from the one end in motor chamber is provided with the high-pressure stage gas vent, the intercommunication pipeline with the high-pressure stage induction port intercommunication, the gas flow direction in the high-pressure stage compression chamber by the high-pressure stage induction port is directional the high-pressure stage gas vent.
The low pressure level rotor pair includes intermeshing's low pressure level male rotor and low pressure level female rotor, high pressure level rotor pair includes intermeshing's high pressure level male rotor and high pressure level female rotor, the motor intracavity is provided with the motor, low pressure level male rotor with the output shaft lug connection of motor, high pressure level male rotor with the output shaft of motor passes through the coupling joint.
The axis of the low-pressure stage male rotor, the axis of the low-pressure stage female rotor, the axis of the output shaft of the motor, the axis of the high-pressure stage male rotor and the axis of the high-pressure stage female rotor are all located on the same plane, when the plane is horizontally arranged, the low-pressure stage air suction port and the high-pressure stage air suction port are located above the plane, and the low-pressure stage exhaust port and the high-pressure stage exhaust port are located below the plane.
The double-stage screw compressor further comprises a low-pressure stage slide valve and a high-pressure stage slide valve, the low-pressure stage slide valve is arranged on the low-pressure stage rotor pair, the high-pressure stage slide valve is arranged on the high-pressure stage rotor pair, and the low-pressure stage slide valve and the high-pressure stage slide valve are both located below the plane.
The acting force of the low-pressure-stage rotor on the received airflow is the same as the acting force of the high-pressure-stage rotor on the received airflow in value and opposite in direction.
The air suction end of the low-pressure stage male rotor and the air suction end of the high-pressure stage male rotor are both connected with an output shaft of the motor, and the diameter of the output shaft is the same as that of the low-pressure stage male rotor.
An air conditioning unit comprises the double-stage screw compressor.
The utility model provides a doublestage screw compressor and air conditioning unit, adopt the communicating pipe way to carry out the secondary compression with the exhaust drainage of low pressure stage compression chamber to the high pressure stage compression intracavity, overcome among the prior art when needing the exhaust of low pressure stage compression chamber flow into the high pressure stage compression intracavity behind the motor chamber and cause the fluid temperature rise and the problem that the compression ratio descends, and make the gas flow direction in the low pressure stage compression intracavity opposite with the direction of the gas flow direction in the high pressure stage compression intracavity, and then make the low pressure stage rotor opposite with the axial force direction that the high pressure stage rotor received, utilize the mutual offset of two axial forces, reduce the whole axial atress of doublestage screw compressor, effectively reduce the vibration noise that produces in the operation process, the low pressure stage rotor is opposite with the direction of rotation of high pressure stage rotor pair and all arrange the sliding valve in the downside, make the focus of doublestage screw compressor stable, is beneficial to vibration reduction and noise reduction.
Drawings
Fig. 1 is a schematic structural diagram of a two-stage screw compressor according to an embodiment of the present invention;
fig. 2 is a suction end view of a pair of high-pressure stage rotors of an embodiment of a two-stage screw compressor and air conditioning unit provided by the present invention;
fig. 3 is a suction end view of a pair of low-pressure stage rotors of an embodiment of a two-stage screw compressor and air conditioning unit provided by the present invention;
in the figure:
1. a communicating pipeline; 2. a low pressure stage compression chamber; 3. a motor cavity; 4. a high pressure stage compression chamber; 5. A low-pressure stage rotor pair; 6. a high-pressure stage rotor pair; 7. a coupling; 21. a low-pressure stage air suction port; 22. A low pressure stage exhaust port; 41. a high-pressure stage air suction port; 42. a high pressure stage exhaust port.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
As shown in fig. 1 to 3, the two-stage screw compressor includes a communication pipeline 1, and a low-pressure stage compression cavity 2, a motor cavity 3 and a high-pressure stage compression cavity 4 which are arranged in parallel in sequence, the low-pressure stage compression cavity 2, the motor cavity 3 and the high-pressure stage compression cavity 4 are all arranged in a sealing manner, one end of the communication pipeline 1 is communicated with an exhaust port of the low-pressure stage compression cavity 2, the other end is communicated with an air suction port of the high-pressure stage compression cavity 4, and the gas flow direction in the low-pressure stage compression cavity 2 is opposite to the gas flow direction in the high-pressure stage compression cavity 4, the communication pipeline 1 is adopted to guide the exhaust gas in the low-pressure stage compression cavity 2 to the high-pressure stage compression cavity 4 for secondary compression, so as to overcome the problem that the exhaust gas in the low-pressure stage compression cavity 2 flows into the high-pressure stage compression cavity 4 after passing through the motor cavity 3 to cause the rise of the fluid, and the direction of the gas flow in the low-pressure stage compression cavity 2 is opposite to the direction of the gas flow in the high-pressure stage compression cavity 4, so that the axial force applied to the low-pressure stage rotor pair is opposite to the axial force applied to the high-pressure stage rotor pair, the overall axial stress of the two-stage screw compressor is reduced by utilizing the mutual offset of the two axial forces, and the vibration noise generated in the operation process is effectively reduced.
The low-pressure stage compression cavity 2 is internally provided with a low-pressure stage rotor pair 5, the high-pressure stage compression cavity 4 is internally provided with a high-pressure stage rotor pair 6, the rotating direction of the low-pressure stage rotor pair 5 is opposite to that of the high-pressure stage rotor pair 6, so that the gravity center of the two-stage screw compressor is stable, and vibration and noise reduction is facilitated.
Low pressure stage compression chamber 2 is close to the one end in motor chamber 3 is provided with low pressure stage induction port 21, keeps away from the one end in motor chamber 3 is provided with low pressure stage gas vent 22, communicating pipe 1 with low pressure stage gas vent 22 intercommunication, the gas flow direction in the low pressure stage compression chamber 2 by low pressure stage induction port 21 extremely low pressure stage gas vent 22, also be the gas flow direction in the low pressure stage compression chamber 2 for keeping away from the direction in motor chamber 3, and the rotor that plays the compression effect in low pressure stage compression chamber 2 is to receiving the extrusion of gas and producing the first axial force to motor chamber 3 direction.
The high-pressure stage compression chamber 4 is close to the one end in motor chamber 3 is provided with high-pressure stage induction port 41, keeps away from the one end in motor chamber 3 is provided with high-pressure stage gas vent 42, communicating pipe 1 with high-pressure stage induction port 41 intercommunication, the gaseous flow direction in the high-pressure stage compression chamber 4 by high-pressure stage induction port 41 points to high-pressure stage gas vent 42, also is the gaseous flow direction in the high-pressure stage compression chamber 4 for keeping away from the direction in motor chamber 3, and the rotor that plays the compression effect in high-pressure stage compression chamber 4 produces the second axial force to motor chamber 3 direction to receiving the extrusion of gas, and wherein first axial force is opposite with second axial force direction.
The low pressure stage rotor is to 5 including intermeshing's low pressure stage male rotor and low pressure stage female rotor, high pressure stage rotor is to 6 including intermeshing's high pressure stage male rotor and high pressure stage female rotor, be provided with the motor in the motor chamber 3, low pressure stage male rotor with the output shaft lug connection of motor, high pressure stage male rotor with the output shaft of motor passes through shaft coupling 7 and connects, and also the axial force of low pressure stage rotor to 5 and the axial force of high pressure stage rotor to 6 all point to shaft coupling 7 to offset in shaft coupling 7 department, thereby effectual reduction doublestage helical-lobe compressor's whole axial force, thereby reduce the vibration noise that doublestage helical-lobe compressor produced because of the atress.
The axis of the low-pressure stage male rotor, the axis of the low-pressure stage female rotor, the axis of the output shaft of the motor, the axis of the high-pressure stage male rotor and the axis of the high-pressure stage female rotor are all in the same plane, and when the plane is horizontally arranged, the low-pressure stage air suction port 21 and the high-pressure stage air discharge port 42 are above the plane, and the low-pressure stage air discharge port 22 and the high-pressure stage air suction port 41 are below the plane, at this time, the exhaust air of the low-pressure stage compression cavity 2 can directly flow into the air suction port of the high-pressure stage compression cavity 4 through the communication pipeline 1 from the lower part of the plane, and the air in the communication pipeline 1 can directly flow horizontally below the plane, so that the internal pressure loss caused by the fact that the air flow needs to flow in the vertical direction is avoided, and the energy efficiency of the two.
The double-stage screw compressor further comprises a low-pressure stage slide valve and a high-pressure stage slide valve, the low-pressure stage slide valve is arranged on the low-pressure stage rotor pair 5, the high-pressure stage slide valve is arranged on the high-pressure stage rotor pair 6, the low-pressure stage slide valve and the high-pressure stage slide valve are both located below the plane, an outlet of the low-pressure stage slide valve is communicated with the low-pressure stage exhaust port 22, an outlet of the high-pressure stage slide valve is communicated with the high-pressure stage exhaust port 42, the gravity center of the compressor is stable, and vibration and noise reduction is facilitated.
The acting force of the low-pressure-stage rotor pair 5 on the air flow is the same as and opposite to the acting force of the high-pressure-stage rotor pair 6 on the air flow in direction, and the force values of the low-pressure-stage rotor pair 5 and the high-pressure-stage rotor pair 6 are adjusted according to the actual size setting, so that the resultant force generated at the coupler 7 is basically zero, and the integral axial force of the two-stage screw compressor is reduced to the maximum extent.
Because the stress of the exhaust end of the rotor is generally larger than that of the suction end, the bearing at the exhaust end has larger relative model selection specification, but is influenced by the oil cylinder at the exhaust side, the bearing cannot be overlarge, but the stress of the air suction end is small, the female rotor can be provided with a smaller bearing without the influence of the oil cylinder, therefore, the male rotor can select a larger bearing, the shaft diameter can be larger, therefore, the air suction end of the low-pressure stage male rotor and the air suction end of the high-pressure stage male rotor are both connected with the output shaft of the motor, and the diameter of the output shaft is the same as that of the low-pressure stage male rotor, so that the output shaft of the motor can be thickened, therefore, the effect of enhancing the flexibility of the rotor shaft system is improved, the stability is greatly enhanced, and the technical problems that the motor shaft cannot be thickened due to the influence of the diameter of the exhaust shaft when the exhaust shaft of the primary male rotor is connected with the motor in the prior art are effectively solved.
An air conditioning unit comprises the double-stage screw compressor.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (9)
1. A two-stage screw compressor characterized by: comprises a communicating pipeline (1), and a low-pressure stage compression cavity (2), a motor cavity (3) and a high-pressure stage compression cavity (4) which are arranged in parallel in sequence, the low-pressure stage compression cavity (2) and the motor cavity (3) and the high-pressure stage compression cavity (4) and the motor cavity (3) are sealed, one end of the communicating pipeline (1) is communicated with the exhaust port of the low-pressure stage compression cavity (2), the other end is communicated with the air suction port of the high-pressure stage compression cavity (4), and the gas flow direction in the low-pressure stage compression cavity (2) is opposite to the gas flow direction in the high-pressure stage compression cavity (4), a low-pressure stage rotor pair (5) is arranged in the low-pressure stage compression cavity (2), a high-pressure stage rotor pair (6) is arranged in the high-pressure stage compression cavity (4), the rotating direction of the low-pressure stage rotor pair (5) is opposite to that of the high-pressure stage rotor pair (6).
2. The two-stage screw compressor of claim 1, wherein: low pressure stage compression chamber (2) are close to the one end in motor chamber (3) is provided with low pressure stage induction port (21), keeps away from the one end in motor chamber (3) is provided with low pressure stage gas vent (22), communicating pipe way (1) with low pressure stage gas vent (22) intercommunication, the gas flow direction in low pressure stage compression chamber (2) by low pressure stage induction port (21) extremely low pressure stage gas vent (22).
3. The two-stage screw compressor of claim 2, wherein: high-pressure stage compression chamber (4) are close to the one end of motor chamber (3) is provided with high-pressure stage induction port (41), keeps away from the one end of motor chamber (3) is provided with high-pressure stage gas vent (42), communicating pipe way (1) with high-pressure stage induction port (41) intercommunication, the gas flow direction in high-pressure stage compression chamber (4) by high-pressure stage induction port (41) are directional high-pressure stage gas vent (42).
4. The two-stage screw compressor of claim 3, wherein: the low-pressure stage rotor pair (5) comprises a low-pressure stage male rotor and a low-pressure stage female rotor which are meshed with each other, the high-pressure stage rotor pair (6) comprises a high-pressure stage male rotor and a high-pressure stage female rotor which are meshed with each other, a motor is arranged in the motor cavity (3), the low-pressure stage male rotor is directly connected with an output shaft of the motor, and the high-pressure stage male rotor is connected with the output shaft of the motor through a coupler (7).
5. The two-stage screw compressor of claim 4, wherein: the axis of the low-pressure stage male rotor, the axis of the low-pressure stage female rotor, the axis of the output shaft of the motor, the axis of the high-pressure stage male rotor and the axis of the high-pressure stage female rotor are all in the same plane, when the planes are horizontally arranged, the low-pressure stage air suction port (21) and the high-pressure stage air suction port (41) are located above the planes, and the low-pressure stage exhaust port (22) and the high-pressure stage exhaust port (42) are located below the planes.
6. The two-stage screw compressor of claim 5, wherein: the double-stage screw compressor further comprises a low-pressure stage slide valve and a high-pressure stage slide valve, the low-pressure stage slide valve is arranged on the low-pressure stage rotor pair (5), the high-pressure stage slide valve is arranged on the high-pressure stage rotor pair (6), and the low-pressure stage slide valve and the high-pressure stage slide valve are both located below the plane.
7. The two-stage screw compressor of claim 4, wherein: the acting force of the airflow received by the low-pressure stage rotor pair (5) is the same as the acting force of the airflow received by the high-pressure stage rotor pair (6) in value and opposite in direction.
8. The two-stage screw compressor of claim 4, wherein: the air suction end of the low-pressure stage male rotor and the air suction end of the high-pressure stage male rotor are both connected with an output shaft of the motor, and the diameter of the output shaft is the same as that of the low-pressure stage male rotor.
9. An air conditioning unit, its characterized in that: comprising the two-stage screw compressor of any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921396372.5U CN210949113U (en) | 2019-08-26 | 2019-08-26 | Two-stage screw compressor and air conditioning unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921396372.5U CN210949113U (en) | 2019-08-26 | 2019-08-26 | Two-stage screw compressor and air conditioning unit |
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| Publication Number | Publication Date |
|---|---|
| CN210949113U true CN210949113U (en) | 2020-07-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921396372.5U Withdrawn - After Issue CN210949113U (en) | 2019-08-26 | 2019-08-26 | Two-stage screw compressor and air conditioning unit |
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| CN (1) | CN210949113U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110397589A (en) * | 2019-08-26 | 2019-11-01 | 珠海格力电器股份有限公司 | Two-stage screw compressor with axial force balancing function and air conditioning unit |
-
2019
- 2019-08-26 CN CN201921396372.5U patent/CN210949113U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110397589A (en) * | 2019-08-26 | 2019-11-01 | 珠海格力电器股份有限公司 | Two-stage screw compressor with axial force balancing function and air conditioning unit |
| CN110397589B (en) * | 2019-08-26 | 2023-10-10 | 珠海格力电器股份有限公司 | Double-stage screw compressor with axial force balancing function and air conditioning unit |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20200707 Effective date of abandoning: 20231010 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20200707 Effective date of abandoning: 20231010 |