Compressor and air conditioner with rectification function

Abstract

The present invention relates to a compressor and an air conditioner with a rectifying function, the compressor comprising: a first compression part (2), comprising an exhaust port for discharging compressed gas; a second compression part (3), comprising an air intake port connected to the exhaust port of the first compression part (2); and a refrigerant pipeline, used to connect the exhaust port of the first compression part (2) and the air intake port of the second compression part (3), the refrigerant pipeline comprising a rectifying part (14), the inner diameter of at least part of the rectifying part (14) gradually shrinks along the refrigerant flow direction. By applying the technical solution of the present application, a rectifying part is provided in the refrigerant pipeline for connecting the exhaust port of the first compression part and the air intake port of the second compression part, thereby improving the problem of large flow loss caused by air flow turbulence in the prior art.

Description

Technical Field

[0001] The invention relates to the technical field of refrigeration, and in particular to a compressor and an air conditioner with rectification function. Background Art

[0002] Figure 1 A schematic diagram of the structure of a centrifugal compressor of the related art is shown. Figure 1 As shown, the centrifugal compressor includes a compressor body, which includes a main shaft 1 connected to the rotor of the motor, a first compression part 2 connected to the first end of the main shaft 1, and a second compression part 6 connected to the second end of the main shaft. The air intake of the second compression part 6 is connected to the exhaust port of the first compression part 2, and the second compression part 6 is used to re-compress the refrigerant compressed by the first compression part 2.

[0003] The centrifugal compressor further includes a refrigerant pipeline provided outside the compressor body, and the refrigerant pipeline is used to connect the exhaust port of the first compression part 2 and the suction port of the second compression part 6. The refrigerant pipeline includes a horizontal pipeline 4, a first vertical pipeline 3 for connecting the first end of the horizontal pipeline 4 and the exhaust port of the first compression part 2, and a second vertical pipeline 5 for connecting the second end of the horizontal pipeline 4 and the second compression part 6.

[0004] In terms of development trend, more and more centrifugal compressors are beginning to achieve oil-free operation, including magnetic suspension centrifugal compressors and refrigerant lubricated centrifugal compressors. The bearings commonly used in refrigerant lubricated centrifugal compressors are refrigerant lubricated rolling bearings, which have high requirements on shaft stability, speed, and axial force. Therefore, they are often used when the installation space allows. Figure 1 The double-headed cantilever shaft arrangement shown in the figure requires solving the problem of large flow losses in the pipeline between the first compression section 2 and the second compression section 6. After research, it was found that the flow losses in the pipeline from the exhaust port of the first compression section 2 to the intake port of the second compression section 6 account for a large proportion, and the energy loss caused by the turbulent air flow accounts for a large part of the flow losses in this section. Therefore, it is necessary to design an inter-stage flow guide device in the pipeline to solve the problem of large flow losses caused by turbulent air flow in the connecting pipeline and improve the energy efficiency of the compressor. Summary of the invention

[0005] The present invention aims to provide a compressor and an air conditioner to improve the problem of large flow loss caused by turbulent air flow in a pipeline between two-stage compression parts existing in the related art.

[0006] According to one aspect of an embodiment of the present invention, the present invention provides a compressor, the compressor comprising:

[0007] A first compression section including an exhaust port for exhausting compressed gas;

[0008] A second compression part includes an air intake port communicating with the exhaust port of the first compression part; and

[0009] The refrigerant pipeline is used to connect the exhaust port of the first compression part and the intake port of the second compression part. The refrigerant pipeline includes a rectifying part, and the inner diameter of at least part of the rectifying part gradually decreases along the flow direction of the refrigerant.

[0010] Optionally, the rectifying portion comprises a first tapered section whose inner diameter gradually tapers along the flow direction of the refrigerant, and a cross section of the first tapered section parallel to the axis of the refrigerant pipe is curved.

[0011] Optionally, the rectifying portion further includes a second tapered section whose inner diameter gradually tapers along the flow direction of the refrigerant, the second tapered section being located downstream of the first tapered section along the flow direction of the refrigerant, and the rectifying portion further includes an intermediate section between the first tapered section and the second tapered section.

[0012] Optionally, the compressor further comprises a switch portion for controlling the on / off of the refrigerant pipeline, and the switch portion is arranged between the first tapered section and the second tapered section.

[0013] Optionally,

[0014] The inner diameter of the small diameter end of the first tapered section is equal to the inner diameter of the large diameter end of the second tapered section; or

[0015] The inner diameter of the small diameter end of the first tapered section is greater than the inner diameter of the large diameter end of the second tapered section, and the inner diameter of the middle section tapers from the first tapered section to the second tapered section.

[0016] Optionally, the compressor further comprises a flow stabilizing portion located downstream of the rectifying portion along the flow direction of the refrigerant, and an inner diameter of the flow stabilizing portion gradually decreases along the flow direction of the refrigerant.

[0017] Optionally, the inner diameter change rate of the flow stabilizing portion is smaller than the inner diameter change rate of the flow rectifying portion.

[0018] Optionally, the compressor further comprises:

[0019] A switch part, used to control the opening and closing of the refrigerant pipeline; and

[0020] The controller is used to control the switch to close the refrigerant pipeline before the compressor stops.

[0021] Optionally, the switch portion includes a blade, and the blade is rotatable around a rotation axis extending in a radial direction of the refrigerant pipeline to open and close the refrigerant pipeline.

[0022] Optionally, the blade includes a blade body and a blade shaft connected to the blade body, a mounting hole matched with the blade shaft is provided on the refrigerant pipe, and the blade shaft passes through the mounting hole along the radial direction of the refrigerant pipe.

[0023] Optionally, the plurality of blades are arranged along the circumference of the refrigerant pipe, and the compressor further includes a gear ring sleeved outside the refrigerant pipe, and the gear ring is connected to the plurality of blade shafts.

[0024] Optionally, the compressor further comprises a main shaft, and the first compression part and the second compression part are respectively connected to two ends of the main shaft.

[0025] Optionally, the refrigerant pipeline includes a horizontal pipe section parallel to the main axis, and the rectifying part is arranged in the horizontal pipe section.

[0026] Optionally,

[0027] The first compression part includes a first centrifugal impeller and a first diffuser for compressing the refrigerant accelerated by the first centrifugal impeller; or

[0028] The second compression part includes a second centrifugal impeller and a second diffuser for compressing the refrigerant accelerated by the second centrifugal impeller.

[0029] According to another aspect of the present application, an air conditioner is also provided, and the air conditioner includes the above-mentioned compressor.

[0030] By applying the technical solution of the present application, a rectifying part is provided in the refrigerant pipe connecting the exhaust port of the first compression part and the intake port of the second compression part, thereby improving the problem of large flow loss caused by air flow turbulence existing in the prior art.

[0031] Further features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0033] Figure 1 A schematic structural diagram of a compressor of related technology is shown;

[0034] Figure 2 A partial structural schematic diagram of a compressor according to an embodiment of the present invention is shown;

[0035] Figure 3 A schematic diagram showing the structure of a compressor pipeline according to an embodiment of the present invention is shown;

[0036] Figure 4 A schematic diagram showing a partial structure of a pipeline according to an embodiment of the present invention; and

[0037] Figure 5 A schematic structural diagram of a blade according to an embodiment of the present invention is shown.

[0038] In the figure:

[0039] 1. Main shaft; 2. First compression part; 3. Second compression part; 4. First pipeline; 5. Ring gear; 6. Motor; 7. Sleeve; 8. Rotating shaft; 9. Gear; 10. Second pipeline; 11. Rectifier; 12. Blade; 13. First flange; 14. Rectification part; 15. Flow stabilization part; 16. Blade shaft; 17. Mounting hole. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] The compressor of this embodiment includes a compressor body and a refrigerant pipe provided outside the compressor body. Figure 2 Schematic diagram of the structure of the compressor body of this embodiment is shown. Figure 3 A partial structural schematic diagram of a refrigerant pipeline of the compressor of this embodiment is shown.

[0042] like Figure 2 As shown, the compressor body of this embodiment includes a main shaft 1 and a first compression part 2 and a second compression part 3 respectively arranged at both ends of the main shaft 1. The exhaust port of the first compression part 2 is connected to the intake port of the second compression part 3, and the second compression part 3 is used to re-compress the refrigerant compressed by the first compression part 2.

[0043] The first compression unit 2 includes a first centrifugal impeller 2a and a first diffuser 2b for compressing the refrigerant accelerated by the first centrifugal impeller 2a. The first centrifugal impeller 2a is connected to a first end of the main shaft 1.

[0044] The second compression unit 3 includes a second centrifugal impeller 3a and a second diffuser 3b for compressing the refrigerant accelerated by the second centrifugal impeller 3a. The second centrifugal impeller 3a is connected to the second end of the main shaft 1.

[0045] Figure 3 The schematic diagram of the partial structure of the refrigerant pipeline of the compressor of this embodiment is shown, and the refrigerant pipeline includes a first pipeline 4 connected to the exhaust port of the first compression part 2 and a second pipeline 10 connected to the air intake port of the second compression part 3. One end of the first pipeline 4 away from the exhaust port of the first compression part 2 is connected to one end of the second pipeline 10 away from the air intake port of the second compression part 3.

[0046] The refrigerant pipeline includes a horizontal pipe section parallel to the main shaft 1 of the compressor, at least a section of the first pipeline 4 adjacent to the second pipeline 10 is a horizontal pipe section, and at least a section of the second pipeline 10 adjacent to the first pipeline 4 is a horizontal pipe section.

[0047] The refrigerant pipeline further includes a rectifier 11, which is connected to the outlet end of the first pipeline 4 and extends toward the second pipeline 10. Optionally, the rectifier 11 is sleeved inside the second pipeline 10. Optionally, the rectifier 11 is tubular.

[0048] The rectifier 11 includes a rectifying portion 14 for reducing the turbulence of the refrigerant, and the inner diameter of at least part of the rectifying portion 14 gradually decreases along the flow direction of the refrigerant. In this embodiment, the refrigerant is collected by the rectifying portion 14 whose inner diameter gradually decreases along the flow direction of the refrigerant to reduce the turbulence of the airflow, thereby improving the problem of large flow loss caused by airflow turbulence in the related art.

[0049] Figure 4 FIG. 1 shows a schematic diagram of the structure of the rectifier 11 of this embodiment. Figure 4 As shown, the rectifying portion 14 of this embodiment includes a first tapered section 14a whose inner diameter gradually tapers along the refrigerant flow direction. The cross section of the first tapered section 14a parallel to the axis of the refrigerant pipe is curved to enhance the effect of the rectifying portion 14 in reducing airflow turbulence.

[0050] The rectifying portion 14 further includes a second tapered section 14b whose inner diameter gradually tapers along the refrigerant flow direction. The second tapered section 14b is located downstream of the first tapered section 14a along the refrigerant flow direction. The rectifying portion 14 further includes a middle section 14c located between the first tapered section 14a and the second tapered section 14b.

[0051] In some embodiments, the inner diameter of the small diameter end of the first tapered section 14a is equal to the inner diameter of the large diameter end of the second tapered section 14b, and the inner diameter of the middle section 14c remains unchanged from the first tapered section 14a to the second tapered section 14b.

[0052] In another embodiment, the inner diameter of the small diameter end of the first tapered section 14a is greater than the inner diameter of the large diameter end of the second tapered section 14b, and the inner diameter of the middle section 14c tapers from the first tapered section 14a to the second tapered section 14b. Optionally, the cross section of the middle section 14c parallel to the axis of the refrigerant pipe is curved to improve the effect of the rectifying portion 14 on reducing the degree of airflow turbulence.

[0053] Preferably, the cross section of the second tapered section 14b parallel to the axis of the refrigerant pipe is curved.

[0054] The rectifying section 14 for converging and collecting airflow includes a first tapered section 14a and a second tapered section 14b arranged at intervals and an intermediate section 14c formed by a transition curve between the first tapered section 14a and the second tapered section 14b. The turbulent refrigerant compressed by the first compression section 2 is converged and rectified on the convergent curve of the first tapered section 14, then enters the transition curve of the intermediate section 14c for further rectification, and then enters the convergent curve of the second tapered section 14b for convergence and rectification again. The turbulent refrigerant basically becomes a uniform flow after passing through the convergent and rectifying area.

[0055] The compressor further includes a flow stabilizing portion 15 located downstream of the rectifying portion 14 along the refrigerant flow direction, and the inner diameter of the flow stabilizing portion 15 gradually decreases along the refrigerant flow direction. The flow stabilizing portion 15 allows the compressed refrigerant passing through the convergent rectifying portion 14 to transition into a uniform refrigerant and then flow to the second compression portion through the refrigerant pipeline, and the flow stabilizing portion 15 plays a transition role.

[0056] In this embodiment, the inner diameter change rate of the flow stabilizing portion 15 is smaller than the inner diameter change rate of the flow rectifying portion 14 .

[0057] The compressor also includes a switch unit for controlling the on and off of the refrigerant pipeline and a controller for controlling the switch unit to close the refrigerant pipeline before the compressor stops working. Cutting off the refrigerant channel before the compressor stops working is beneficial to prevent the refrigerant in the second compression part 3 from flowing back into the first compression part 2. The impact of the compressed refrigerant on the impeller and the main shaft can be greatly reduced, thereby improving the load-bearing conditions of the high-precision rolling bearing and extending the bearing life.

[0058] Optionally, the switch section is mounted on the middle section 14 c of the rectifying section 14 .

[0059] like Figure 4 As shown, the rectifier 11 is provided with a first flange 13 for connecting the first pipeline 4 and / or the second pipeline. The first pipeline 4 is provided with a second flange at one end adjacent to the second pipeline 10, and the second pipeline 10 is provided with a third flange at one end adjacent to the first pipeline 4. The first, second and third flanges are connected together to achieve the connection between the first pipeline 4, the second pipeline 10 and the rectifier 11.

[0060] Combination Figure 3 and 4 As shown, the switch portion of this embodiment includes a blade 12. The blade 12 can rotate around a rotation axis extending along the radial direction of the refrigerant pipeline to open and close the refrigerant pipeline.

[0061] Figure 5 The structure diagram of the blade 12 of this embodiment is shown. The blade 12 includes a blade body and a blade shaft 16 connected to the blade body. Figures 3 to 5 As shown, the refrigerant pipe is provided with a mounting hole 17 adapted to the blade shaft 16, and the blade shaft 16 passes through the mounting hole 17 along the radial direction of the refrigerant pipe. The mounting hole 17 is provided on the middle section of the rectifying part 14.

[0062] Multiple blades 12 are arranged along the circumference of the refrigerant pipeline. The compressor also includes a gear ring 5 mounted outside the refrigerant pipeline. The gear ring 5 is transmission-connected to multiple blade shafts 16 to drive the multiple blades 12 to switch between a first position closing the refrigerant channel and a second position opening the refrigerant channel.

[0063] In this embodiment, the mounting hole 14 is provided on the rectifier 11 . The gear ring 5 is sleeved outside the rectifier 11 .

[0064] A first tooth is disposed at one axial end of the gear ring 5, and a second tooth meshing with the first tooth is disposed on the blade shaft 16. When the gear ring 5 rotates with its axis as the rotation center, the blade shaft 16 is driven to rotate, thereby driving the blade 12 to open and close the refrigerant pipe.

[0065] The compressor further comprises a motor 6, a rotating shaft 8 connected to the motor 6 and a gear 9 mounted on the rotating shaft 8. The second axial end of the gear ring 5 is provided with a third tooth meshing with the gear 9. The motor 6 and the rotating shaft 8 are connected via a sleeve 7.

[0066] The motor 6 drives the ring gear 5 to rotate with its axis as the rotation center through the rotating shaft 8 and the gear 9. The rotation of the ring gear 5 drives the plurality of blade shafts 16 to rotate, so that the blades 12 open and close the refrigerant pipeline.

[0067] In this embodiment, the blade 12 includes a blade body, a blade shaft 16 connected to the blade body, and a second tooth meshing with the gear ring 5. The blade body is a fan-shaped structure. Such a blade has high versatility and is easy to process. Other structural forms can also be used as needed. The edge of the blade body needs to smoothly transition to the blade surface. When the blade 12 opens the refrigerant pipe, the blade 12 is parallel to the airflow direction. When the blade 12 closes the refrigerant pipe, the blade body is perpendicular to the airflow direction, and the blade basically closes the entire pipe cross-section; the blade shaft 16 is used to install the blade on the refrigerant pipe; the second tooth on the blade shaft 16 meshes with the first tooth of the gear ring 5, and when the gear ring 5 rotates, it drives the blade 12 to rotate.

[0068] The specific implementation method is as follows: first, install the blade 12 into the mounting hole 17 on the rectifier 11; then adjust the angles of multiple blades to be consistent (all parallel or perpendicular to the airflow direction); then install the ring gear 5 to ensure that the first tooth of the ring gear 5 and the second tooth on the blade 12 are in meshing position; then install the gear 9 and the rotating shaft 8 in sequence; then connect the rectifier 11 together with the blades 12 and the ring gear 5 and other components to the flange of the first pipe 4 and the flange of the second pipe 10, and finally install the drive motor 6 outside the pipe.

[0069] Before starting the compressor, a control signal is first sent to open the blades, and then the compressor is started and operated. The rectifier 11 plays an inter-stage guide role, which is used to converge and guide the inter-stage airflow and reduce the flow loss caused by airflow turbulence. Before shutting down the compressor, the blades are first closed and then shut down. Since the blades cut off the refrigerant pipeline and hinder the gas flow, the amount of refrigerant backflow from the impeller exhaust port (high-pressure refrigerant) to the impeller inlet (low-pressure refrigerant) can be greatly reduced, and the impact of the compressed refrigerant on the impeller and the main shaft can be greatly reduced, thereby improving the load-bearing conditions of the high-precision rolling bearings and extending the bearing life.

[0070] Therefore, the present invention can effectively reduce the aerodynamic loss in the inter-stage connecting pipeline from the first-stage exhaust port to the second-stage intake port of a double-headed cantilever shaft arrangement centrifugal compressor, and can improve the load-bearing conditions of high-precision bearings used in the compressor, extend the service life, and achieve comprehensive improvements in operating performance and service life.

[0071] The above description is only an exemplary embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A compressor, characterized in that: include: A first compression section (2) comprising an exhaust port for discharging compressed gas; A second compression part (3) comprising an air intake port connected to the exhaust port of the first compression part (2); as well as A refrigerant pipeline is used to connect the exhaust port of the first compression part (2) and the intake port of the second compression part (3), the refrigerant pipeline comprises a rectifying part (14), and the inner diameter of at least a part of the rectifying part (14) gradually decreases along the refrigerant flow direction. The compressor further comprises a main shaft (1), the first compression part (2) and the second compression part (3) being connected to two ends of the main shaft (1) respectively. The refrigerant pipeline includes a horizontal pipe section parallel to the main axis, and the rectifying part is arranged in the horizontal pipe section; A switch unit, used to control the on / off of the refrigerant pipeline; and The controller is used to control the switch to close the refrigerant pipeline before the compressor stops.

2. The compressor according to claim 1, characterized in that The rectifying part (14) It comprises a first tapered section (14a) whose inner diameter gradually tapers along the flow direction of the refrigerant, wherein the cross section of the first tapered section (14a) parallel to the axis of the refrigerant pipeline is in a curved shape.

3. The compressor according to claim 2, characterized in that The rectifying portion (14) further comprises a second tapered section (14b) whose inner diameter gradually tapers along the flow direction of the refrigerant, the second tapered section (14b) being located downstream of the first tapered section (14a) along the flow direction of the refrigerant, and the rectifying portion (14) further comprises an intermediate section (14c) located between the first tapered section (14a) and the second tapered section (14b).

4. The compressor according to claim 3, characterized in that It also includes a switch part for controlling the on and off of the refrigerant pipeline, and the switch part is arranged between the first tapered section (14a) and the second tapered section (14b).

5. The compressor according to claim 3, characterized in that The inner diameter of the small diameter end of the first tapered section (14a) is equal to the inner diameter of the large diameter end of the second tapered section (14b); or The inner diameter of the small diameter end of the first tapered section (14a) is greater than the inner diameter of the large diameter end of the second tapered section (14b), and the inner diameter of the middle section (14c) tapers along the direction from the first tapered section (14a) to the second tapered section (14b).

6. The compressor according to claim 1, characterized in that It also includes a flow stabilizing portion (15) located downstream of the rectifying portion (14) along the flow direction of the refrigerant, wherein the inner diameter of the flow stabilizing portion (15) gradually decreases along the flow direction of the refrigerant.

7. The compressor according to claim 6, characterized in that The inner diameter change rate of the flow stabilizing portion (15) is smaller than the inner diameter change rate of the flow rectifying portion (14).

8. The compressor according to claim 1, characterized in that The switch portion comprises a blade (12), and the blade (12) can rotate around a rotation axis extending radially along the refrigerant pipeline to open and close the refrigerant pipeline.

9. The compressor according to claim 8, characterized in that The blade (12) comprises a blade body and a blade shaft (16) connected to the blade body, the refrigerant pipe is provided with a mounting hole (17) adapted to the blade shaft (16), and the blade shaft (16) passes through the mounting hole (17) along the radial direction of the refrigerant pipe.

10. The compressor according to claim 9, characterized in that The plurality of blades (12) are arranged along the circumference of the refrigerant pipe, and the compressor further comprises a gear ring (5) sleeved outside the refrigerant pipe, wherein the gear ring (5) is connected to the plurality of blade shafts (16).

11. The compressor according to claim 1, characterized in that The first compression part (2) comprises a first centrifugal impeller (2a) and a first diffuser (2b) for compressing the refrigerant accelerated by the first centrifugal impeller (2a); or The second compression part (3) comprises a second centrifugal impeller (3a) and a second diffuser (3b) for compressing the refrigerant accelerated by the second centrifugal impeller (3a).

12. An air conditioner, characterized in that: A compressor comprising the compressor according to any one of claims 1 to 11.

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