Single-machine two-stage double-slide-valve screw compressor

Abstract

The invention provides a single-machine two-stage double-slide-valve screw compressor which comprises a low-pressure-stage compression cavity (1), a low-pressure-stage rotor set (2) installed in the low-pressure-stage compression cavity (1), a motor cavity (3), a motor (4), a high-pressure-stage compression cavity (5) and a high-pressure-stage rotor set (6) installed in the high-pressure-stage compression cavity (5). The low-pressure-stage compression cavity (1) and the high-pressure-stage compression cavity (5) are located on the two sides of the motor cavity (3) respectively, the motor (4) drives the low-pressure-stage rotor set (2) and the high-pressure-stage rotor set (6) to rotate respectively, and a first sliding valve (7) is arranged in the low-pressure-stage compression cavity (1) and used for adjusting the capacity. A second slide valve (8) is arranged in the high-pressure-stage compression cavity (5) and used for adjusting the internal volume ratio; and different working condition requirements can be better met.

Description

Technical Field

[0001] The present invention relates to the technical field of screw compressors, and more specifically, to a single-stage double-stage double-slide-valve screw compressor. Background Art

[0002] Existing single-stage double-stage refrigeration compressors only have a single slide valve to adjust the energy efficiency of the compressor, and can only perform capacity adjustment. The adjustment ability is relatively single, and the internal volume ratio of the compressor cannot be independently adjusted, which may lead to a decrease in efficiency under some working conditions. Moreover, in market applications, a single slide valve will increase additional energy consumption in variable working conditions or high-pressure ratio scenarios. Therefore, the present disclosure will propose a single-stage double-stage double-slide-valve screw compressor to better meet different working condition requirements. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the defects of the prior art and propose a single-stage double-stage double-slide-valve screw compressor, which is beneficial to better meet different working condition requirements.

[0004] Compared with the prior art, the present invention proposes a single-stage double-stage double-slide-valve screw compressor, which includes a low-pressure stage compression chamber, a low-pressure stage rotor group installed in the low-pressure stage compression chamber, a motor chamber, a motor, a high-pressure stage compression chamber, and a high-pressure stage rotor group installed in the high-pressure stage compression chamber. The motor is installed in the motor chamber. The low-pressure stage compression chamber and the high-pressure stage compression chamber are respectively located on both sides of the motor chamber. The motor drives the low-pressure stage rotor group and the high-pressure stage rotor group to rotate respectively. A first slide valve is arranged in the low-pressure stage compression chamber for capacity adjustment; a second slide valve is arranged in the high-pressure stage compression chamber for internal volume ratio adjustment.

[0005] As an improvement, the first slide valve is connected to a first regulating solenoid valve and is independently controlled by the first regulating solenoid valve. The second slide valve is connected to a second regulating solenoid valve and is independently controlled by the second regulating solenoid valve.

[0006] As an improvement, the motor chamber is also provided with a motor cooling joint for cooling the motor.

[0007] As an improvement, the motor chamber and the high-pressure stage compression chamber are integrally designed.

[0008] As an improvement, it includes a high-pressure side end cover, an integral housing, a motor chamber end cover, and a low-pressure side end cover connected axially in sequence. The integral housing is provided with a motor chamber and a high-pressure stage compression chamber, and the low-pressure side end cover is provided with a low-pressure stage compression chamber.

[0009] As an improvement, the high-pressure side end cover is provided with a first bearing, the high-pressure stage compression chamber is provided with a second bearing on the side close to the motor chamber, the motor chamber end cover is provided with a third bearing, and the low-pressure side end cover is provided with a fourth bearing on the side far from the motor chamber end cover.

[0010] As an improvement, the high-pressure driving rotor of the high-pressure stage rotor group shares a rotating shaft with the motor, and the low-pressure driving rotor of the low-pressure stage rotor group is connected to the rotating shaft of the motor through a coupling.

[0011] As an improvement, in the case of having a motor chamber end cover, the coupling is arranged in the motor chamber end cover.

[0012] As an improvement, bearings are arranged on both sides of the coupling.

[0013] After adopting the above structure, compared with the prior art, the present invention has the following advantages:

[0014] Through improvement, the present disclosure provides a double-regulating slide valve structure solution by arranging a slide valve, namely a first slide valve and a second slide valve, at the low-pressure stage compression chamber and the high-pressure stage compression chamber respectively. The first slide valve is a capacity regulating slide valve. The axial movement of the first slide valve can achieve the regulation of the gas volume of the compressor, and the regulation range is, for example, 25% - 100% of the maximum gas volume. The second slide valve is an internal volume ratio regulating slide valve. The axial movement of the second slide valve can achieve the regulation of the internal volume ratio of the compressor, and the regulation range is, for example, 7 - 16 of the internal volume ratio. The two slide valves can be independently controlled separately without interference, and can dynamically adjust the exhaust pressure and flow rate of the compressor according to the working conditions, reducing the efficiency loss caused by the mismatch between the internal and external pressure ratios.

[0015] In short, the double-slide valve structure is applicable to working scenarios that require frequent adjustment of cooling capacity or pressure ratio, ensuring that the compressor operates efficiently within a wide range of working conditions.

[0016] Therefore, the present disclosure is conducive to better meeting different working condition requirements. Brief Description of the Drawings

[0017] Figure 1 It is a three-dimensional schematic diagram of a single-stage two-stage double-slide valve screw compressor.

[0018] Figure 2 It is an end view of a single-stage two-stage double-slide valve screw compressor.

[0019] Figure 3 It is a schematic sectional view taken along the A-A direction.

[0020] Figure 4 It is a three-dimensional schematic diagram of a single-stage two-stage double-slide valve screw compressor after removing the housing.

[0021] Figure 5 It is a three-dimensional schematic diagram of a single-stage two-stage double-slide valve screw compressor after removing the housing and from another perspective.

[0022] Description of the reference numerals: 1. Low-pressure stage compression chamber; 2. Low-pressure stage rotor group; 3. Motor chamber; 4. Motor; 5. High-pressure stage compression chamber; 6. High-pressure stage rotor group; 7. First slide valve; 8. Second slide valve; 9. Motor cooling joint; 10. High-pressure side end cover; 11. Integral housing; 12. Motor chamber end cover; 13. Low-pressure side end cover; 14. First bearing; 15. Second bearing; 16. Third bearing; 17. Fourth bearing; 18. High-pressure driving rotor; 19. Low-pressure driving rotor; 20. Coupling; 21. Rotating shaft. Detailed implementation manners

[0023] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The embodiments described below are only examples, and those skilled in the art can think of other obvious variations. The basic principles defined in the following description of the present invention can be applied to other embodiments, variations, improvements, equivalent embodiments, and other technical solutions without departing from the spirit and scope of the present invention.

[0024] The present invention will be further described in detail below:

[0025] For the convenience of description and understanding, the directional description is only used as a schematic and does not constitute a limitation on the scope of the claimed protection.

[0026] As Figures 1 to 5 shown, the present disclosure provides a single-stage double-stage double-slide valve screw compressor, including a low-pressure stage compression chamber 1, a low-pressure stage rotor group 2 installed in the low-pressure stage compression chamber 1, a motor chamber 3, a motor 4, a high-pressure stage compression chamber 5, and a high-pressure stage rotor group 6 installed in the high-pressure stage compression chamber 5. The motor 4 is installed in the motor chamber 3. The low-pressure stage compression chamber 1 and the high-pressure stage compression chamber 5 are respectively located on both sides of the motor chamber 3. The motor 4 drives the low-pressure stage rotor group 2 and the high-pressure stage rotor group 6 to rotate respectively. A first slide valve 7 is provided in the low-pressure stage compression chamber 1 for capacity adjustment; a second slide valve 8 is provided in the high-pressure stage compression chamber 5 for internal volume ratio adjustment.

[0027] In some embodiments, the first slide valve 7 is connected to a first regulating solenoid valve, and the first slide valve 7 is independently controlled by the first regulating solenoid valve. The second slide valve 8 is connected to a second regulating solenoid valve, and the second slide valve 8 is independently controlled by the second regulating solenoid valve. In this way, the two slide valves can be separately and independently controlled without interference. And by independently controlling the gas volume and the internal volume ratio, the compression process can be optimized, the over-compression or under-compression phenomenon can be reduced, and the overall operation efficiency can be improved.

[0028] The structure of the solenoid valve is a conventional technology and will not be elaborated here.

[0029] In some embodiments, as Figure 1 shown, the motor chamber 3 is further provided with a motor cooling joint 9 for cooling the motor 4.

[0030] In this way, the motor 4 is located between the low-pressure stage compression chamber 1 and the high-pressure stage compression chamber 5, and a motor cooling joint 9 is separately configured.

[0031] In some embodiments, as Figure 1 , 3 shown, the motor chamber 3 and the high-pressure stage compression chamber 5 are integrally designed.

[0032] Furthermore, as Figure 1 , 3 shown, it includes a high-pressure side end cover 10, an integral housing 11, a motor chamber end cover 12, and a low-pressure side end cover 13 that are axially connected in sequence. The integral housing 11 is provided with a motor chamber 3 and a high-pressure stage compression chamber 5, and the low-pressure side end cover 13 is provided with a low-pressure stage compression chamber 1. In this way, it is beneficial for the overall structure to be simple, and the number of castings constituting the entire housing can be reduced to 4 castings, with a simple structure and higher transmission efficiency.

[0033] In some embodiments, as Figure 3 shown, the high-pressure side end cover 10 is provided with a first bearing 14, the high-pressure stage compression chamber 5 is provided with a second bearing 15 on the side close to the motor chamber 3, the motor chamber end cover 12 is provided with a third bearing 16, and the low-pressure side end cover 13 is provided with a fourth bearing 17 on the side far from the motor chamber end cover 12.

[0034] In some embodiments, as Figure 3 shown, the high-pressure driving rotor 18 of the high-pressure stage rotor group 6 and the motor 4 share a rotating shaft 21, and the low-pressure driving rotor 19 of the low-pressure stage rotor group 2 is connected to the rotating shaft 21 of the motor 4 through a coupling 20.

[0035] Furthermore, as Figure 3 shown, for the case with a motor chamber end cover 12, the coupling 20 is arranged in the motor chamber end cover 12. In this way, it is more convenient for assembly, improving the assembly quality and efficiency.

[0036] Furthermore, as Figure 3 shown, bearings are arranged on both sides of the coupling 20. In this way, better support is provided, and the bearings on both sides of the coupling 20 are the aforementioned third bearings 16.

[0037] When understanding the present invention, if necessary, the above structures can be referred to other embodiments / attachments Figure 1 and understood, which will not be elaborated here.

[0038] The above are only illustrative embodiments of the present invention. Therefore, all equivalent changes or modifications made according to the structures, features, and principles described in the protection scope of the present invention are included in the protection scope of the present invention.

Claims

1. A single-unit two-stage double-slide-valve screw compressor, comprising a low-pressure stage compression chamber (1), a low-pressure stage rotor group (2) installed in the low-pressure stage compression chamber (1), a motor chamber (3), a motor (4), a high-pressure stage compression chamber (5), and a high-pressure stage rotor group (6) installed in the high-pressure stage compression chamber (5). The motor (4) is installed in the motor chamber (3), the low-pressure stage compression chamber (1) and the high-pressure stage compression chamber (5) are respectively located on both sides of the motor chamber (3), and the motor (4) drives the low-pressure stage rotor group (2) and the high-pressure stage rotor group (6) to rotate respectively. It is characterized in that, A first slide valve (7) is provided in the low-pressure stage compression chamber (1) for capacity adjustment; a second slide valve (8) is provided in the high-pressure stage compression chamber (5) for internal volume ratio adjustment.

2. The single-stage double-stage double-slide valve screw compressor according to claim 1, characterized in that, The first slide valve (7) is connected to a first regulating solenoid valve and is independently controlled by the first regulating solenoid valve. The second slide valve (8) is connected to a second regulating solenoid valve and is independently controlled by the second regulating solenoid valve.

3. The single-stage double-stage double-slide valve screw compressor according to claim 1, characterized in that, The motor chamber (3) is further provided with a motor cooling joint (9) for cooling the motor (4).

4. A single-stage double-stage double-slide valve screw compressor according to claim 1, characterized in that, The motor chamber (3) and the high-pressure stage compression chamber (5) are integrally designed.

5. A single-stage double-stage double-slide valve screw compressor according to claim 4, characterized in that, It includes a high-pressure side end cover (10), an integral housing (11), a motor chamber end cover (12), and a low-pressure side end cover (13) that are axially connected in sequence. The integral housing (11) is provided with a motor chamber (3) and a high-pressure stage compression chamber (5), and the low-pressure side end cover (13) is provided with a low-pressure stage compression chamber (1).

6. The single-stage double-stage double-slider screw compressor according to claim 5, characterized in that, The high-pressure side end cover (10) is provided with a first bearing (14). The high-pressure stage compression chamber (5) is provided with a second bearing (15) on the side close to the motor chamber (3). The motor chamber end cover (12) is provided with a third bearing (16). The low-pressure side end cover (13) is provided with a fourth bearing (17) on the side away from the motor chamber end cover (12).

7. A single-stage double-stage double-slide valve screw compressor according to claim 1 or 4 or 5 or 6, characterized in that, The high-pressure driving rotor (18) of the high-pressure stage rotor group (6) and the motor (4) share a rotating shaft (21). The low-pressure driving rotor (19) of the low-pressure stage rotor group (2) is connected to the rotating shaft (21) of the motor (4) through a coupling (20).

8. A single-stage double-stage double-slide valve screw compressor according to claim 7, characterized in that, In the case of having a motor chamber end cover (12), the coupling (20) is arranged in the motor chamber end cover (12).

9. The single-stage double-stage double-slide valve screw compressor according to claim 8, wherein, Bearings are arranged on both sides of the coupling (20).

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