Compressor and air conditioner

Abstract

The present invention relates to a compressor and an air conditioner. The compressor includes: a housing; a first compression unit, including a first-stage suction port and a first-stage discharge port, the first compression unit being configured to compress the fluid sucked in through the first-stage suction port and discharge the compressed fluid from the first-stage discharge port; and a second compression unit, arranged in sequence with the first compression unit along the axial direction of the housing in the housing, the second compression unit including a second-stage suction port and a second-stage discharge port, the second-stage suction port being in fluid communication with the first-stage discharge port; the second compression unit being configured to compress the fluid sucked in through the second-stage suction port and discharge the compressed fluid from the second-stage discharge port; the first-stage discharge port and the second-stage discharge port are located between the first-stage suction port and the second-stage suction port, the direction from the first-stage suction port to the first-stage discharge port is the first direction; the direction from the second-stage suction port to the second-stage discharge port is the second direction, and the second direction is opposite to the first direction. In the present invention, the resultant force directions of the first and second compression units are opposite, and the force balance of the compressor can be achieved.

Description

Technical Field

[0001] The present invention relates to the field of fluid machinery, and particularly to a compressor and an air conditioner. Background Art

[0002] During the operation of a screw compressor, axial force is generated due to the different suction and exhaust pressures on both sides of the rotor, and radial force is generated due to the influence of rotor tooth profile, structure and other characteristics. The axial force and the radial force form the main loads during the operation of the compressor, and the axial force always points from the exhaust end to the suction end.

[0003] In some related technologies, a single-stage two-stage compressor is used to decompose the force, or a symmetrical four-rotor compressor is used to balance the force. Based on the principle of axial force balance or decomposition, a single-stage two-stage compressor is provided with two groups of rotors with the same or opposite rotation directions on both sides of the motor. The two-stage rotors are connected in series for compression, and the corresponding suction and exhaust pressure differences are reduced, so that the axial force borne by each can be reduced. Since the two-stage rotors need to balance the axial force through a coupling, but the coupling actually mainly bears the torque, the force on the rotors cannot be completely balanced. The four-rotor compressor can theoretically balance the force completely, but the operating conditions of the two groups of rotors are the same, and the requirements for high-pressure difference conditions cannot be met. Summary of the Invention

[0004] Some embodiments of the present invention provide a compressor and an air conditioner to alleviate the problem that the force on the compressor cannot be effectively balanced.

[0005] In one aspect of the present invention, a compressor is provided, including:

[0006] A housing;

[0007] A first compression unit disposed in the housing, the first compression unit includes a first-stage suction port and a first-stage exhaust port, and the first compression unit is configured to compress the fluid sucked from the first-stage suction port and discharge it from the first-stage exhaust port; and

[0008] A second compression unit disposed in the housing and arranged in sequence with the first compression unit along the axial direction of the housing, the second compression unit includes a second-stage suction port and a second-stage exhaust port, and the second-stage suction port is in fluid communication with the first-stage exhaust port; the second compression unit is configured to compress the fluid sucked from the second-stage suction port and discharge it from the second-stage exhaust port;

[0009] Wherein, the first-stage exhaust port and the second-stage exhaust port are located between the first-stage suction port and the second-stage suction port, the direction from the first-stage suction port to the first-stage exhaust port is the first direction; the direction from the second-stage suction port to the second-stage exhaust port is the second direction, and the second direction is opposite to the first direction.

[0010] In some embodiments, the compressor further includes a bearing housing disposed between the first compression unit and the second compression unit. The bearing housing is provided with a first exhaust hole, and the primary exhaust port, the first exhaust hole, and the secondary suction port are in fluid communication in sequence.

[0011] In some embodiments, the bearing housing is provided with a second exhaust hole, and the housing is provided with an exhaust port. The exhaust port is located on a side of the bearing housing close to the first compression unit, and the secondary exhaust port, the second exhaust hole, and the exhaust port are in fluid communication in sequence.

[0012] In some embodiments, the compressor further includes a bearing housing disposed between the first compression unit and the second compression unit; a primary compression chamber, a secondary compression chamber, a primary exhaust chamber, and a secondary exhaust chamber are formed in the housing. The housing includes a first end and a second end arranged axially, and a suction port is provided at the first end of the housing; the first compression unit is disposed in the primary compression chamber; the second compression unit is disposed in the secondary compression chamber;

[0013] Wherein, the primary compression chamber, the secondary exhaust chamber, and the exhaust port are located between the bearing housing and the first end of the housing, the secondary compression chamber and the primary exhaust chamber are located between the bearing housing and the second end of the housing, and the suction port, the primary compression chamber, the primary exhaust chamber, the secondary compression chamber, the secondary exhaust chamber, and the exhaust port are in fluid communication in sequence along the fluid flow direction.

[0014] In some embodiments, the first compression unit includes two first rotors meshing with each other, and the second compression unit includes two second rotors meshing with each other; one of the two first rotors is connected to one of the two second rotors and is located on the same axis, and the other of the two first rotors and the other of the two second rotors are not collinear.

[0015] In some embodiments, the first rotor located on the axis includes a first rotating shaft and a first spiral part; the second rotor located on the axis includes a second rotating shaft and a second spiral part, and the first rotating shaft and the second rotating shaft are coaxially and integrally arranged to form a single rotating shaft.

[0016] In some embodiments, the first spiral part is integrally formed on the single rotating shaft, and the second spiral part is detachably disposed on the single rotating shaft; or, the second spiral part is integrally formed on the single rotating shaft, and the first spiral part is detachably disposed on the single rotating shaft.

[0017] In some embodiments, the central axis of the other one of the two first rotors and the axis form a first plane, and the central axis of the other one of the two second rotors and the axis form a second plane, and there is an angle greater than zero and less than or equal to 180 degrees between the first plane and the second plane.

[0018] In some embodiments, the compressor further includes a driving member, and the driving member is drivingly connected to the first rotor located on the axis.

[0019] In some embodiments, the two first rotors are respectively a first male rotor and a first female rotor, the two second rotors are respectively a second male rotor and a second female rotor, the first male rotor is connected to the second male rotor and is located on the same axis.

[0020] In some embodiments, the compressor further includes a driving member, and the driving member is drivingly connected to the first male rotor.

[0021] In some embodiments, the compressor further includes a bearing housing provided between the first compression unit and the second compression unit; a first hole is provided in the bearing housing, and one end of the first rotor located on the axis and one end of the second rotor are both inserted into the first hole and are connected to each other.

[0022] In some embodiments, a second hole and a third hole are provided in the bearing housing;

[0023] The first end of the first rotor not located on the axis is located between the bearing housing and the first end of the housing, and the second end of the first rotor not located on the axis passes through the second hole and is located between the bearing housing and the second end of the housing;

[0024] The first end of the second rotor not located on the axis is located between the bearing housing and the second end of the housing, and the second end of the second rotor not located on the axis passes through the third hole and is located between the bearing housing and the first end of the housing.

[0025] In some embodiments, the bearing housing is provided with a first exhaust hole communicating the first-stage compression chamber and the first-stage exhaust chamber, and the bearing housing is further provided with a second exhaust hole communicating the second-stage compression chamber and the second-stage exhaust chamber.

[0026] In some embodiments, the first-stage exhaust chamber is located below the central axis of the housing, and the second-stage exhaust chamber is located above the central axis of the housing.

[0027] In some embodiments, the compressor further includes a driving member and a bearing housing disposed between the first compression unit and the second compression unit. The driving member is configured to provide compression power to the first compression unit and the second compression unit. The housing includes a first housing section, a second housing section, and a third housing section that are sequentially connected along the axial direction. The driving member and the first compression unit are disposed within the first housing section, the second compression unit is disposed within the third housing section, and the second housing section and the bearing housing are integrally formed.

[0028] In some embodiments, the housing further includes an end cap and a cover plate. The end cap is disposed at the end of the first housing section to form the first end of the housing, and the cover plate is disposed at the end of the second housing section to form the second end of the housing.

[0029] In another aspect of the present invention, there is provided an air conditioner including the compressor described above.

[0030] Based on the above technical solutions, the present invention has at least the following beneficial effects:

[0031] In some embodiments, the primary exhaust port of the first compression unit and the secondary exhaust port of the second compression unit are located between the primary suction port of the first compression unit and the secondary suction port of the second compression unit. The direction from the primary suction port to the primary exhaust port is the first direction; the direction from the secondary suction port to the secondary exhaust port is the second direction, and the second direction is opposite to the first direction; since the resultant force direction of the first compression unit is from the exhaust end to the suction end; the resultant force direction of the second compression unit is from the exhaust end to the suction end; therefore, the resultant force direction of the first compression unit is opposite to the resultant force direction of the second compression unit, which can achieve force balance of the compressor and improve the energy efficiency of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0033] Figure 1 is a schematic diagram of the overall internal structure of a compressor provided according to some embodiments of the present invention;

[0034] Figure 2 is a schematic diagram of the overall internal air flow direction of a compressor provided according to some embodiments of the present invention;

[0035] Figure 3 is Figure 2 the sectional view taken along line A-A of

[0036] Figure 4 is Figure 2 the sectional view taken along line B-B of

[0037] Figure 5a Schematic diagram of the low-pressure side of the bearing housing provided according to some embodiments of the present invention;

[0038] Figure 5b Schematic diagram of the high-pressure side of the bearing housing provided according to some embodiments of the present invention;

[0039] Figure 6 Schematic diagram of the cooperation between the first rotor and the second rotor provided according to some embodiments of the present invention.

[0040] The descriptions of the reference numerals in the drawings are as follows:

[0041] 1 - Housing; 11 - First compression chamber; 12 - Second compression chamber; 13 - First exhaust chamber; 14 - Second exhaust chamber; 15 - First end of the housing; 16 - Second end of the housing; 17 - Suction port; 18 - Exhaust port; 101 - First housing section; 102 - Second housing section; 103 - Third housing section; 104 - End cover; 105 - Cover plate;

[0042] 2 - First compression unit; 21 - First rotor; 211 - First male rotor; 212 - First female rotor; 213 - First rotating shaft; 214 - First spiral part;

[0043] 3 - Second compression unit; 31 - Second rotor; 311 - Second male rotor; 312 - Second female rotor; 313 - Second rotating shaft; 314 - Second spiral part;

[0044] 4 - Bearing housing; 41 - First hole; 42 - Second hole; 43 - Third hole; 44 - First exhaust hole; 45 - Second exhaust hole; 46 - First exhaust flow channel; 47 - Second exhaust flow channel; 48 - First comb tooth seal structure; 49 - Second comb tooth seal structure;

[0045] 5 - Driving member;

[0046] 6 - Single - body rotating shaft; 61 - Limiting step;

[0047] 7 - Wiring member;

[0048] 8 - First support assembly

[0049] 9 - Second support assembly;

[0050] L - Axis;

[0051] F1 - Resultant force direction of the first compression stage; F2 - Resultant force direction of the second compression stage.

[0052] It should be understood that the dimensions of the various parts shown in the drawings are not drawn according to the actual proportional relationship. In addition, the same or similar reference numerals represent the same or similar components. Detailed Embodiments

[0053] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and in no way limits the present invention and its application or use. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the present invention thorough and complete and to fully convey the scope of the present invention to those skilled in the art. It should be noted that: unless otherwise specifically stated, the relative arrangements of components and steps, the components of materials, numerical expressions, and numerical values set forth in these embodiments should be construed as merely exemplary and not as limitations.

[0054] The terms "first", "second", and the like used in the present invention do not denote any order, quantity, or importance, but are merely used to distinguish different parts. Words such as "comprising" or "including" mean that the elements before the word cover the elements listed after the word and do not exclude the possibility of also covering other elements. Terms such as "upper", "lower", "left", "right", etc. are only used to indicate relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0055] In the present invention, when it is described that a specific device is located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device. When it is described that a specific device is connected to other devices, the specific device may be directly connected to the other devices without an intermediate device, or may not be directly connected to the other devices and have an intermediate device.

[0056] All terms used in the present invention (including technical terms or scientific terms) have the same meaning as understood by those of ordinary skill in the art to which the present invention pertains, unless otherwise specifically defined. It should also be understood that terms defined in a general dictionary, such as those defined in a general dictionary, should be interpreted as having a meaning consistent with their meaning in the context of the relevant art and should not be interpreted in an idealized or overly formal sense, unless specifically defined as such herein.

[0057] Techniques, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods, and devices should be regarded as part of the specification.

[0058] As Figures 1 to 4 shown, some embodiments provide a compressor that includes a housing 1, a first compression unit 2, and a second compression unit 3.

[0059] The first compression unit 2 is disposed within the housing 1. The first compression unit 2 includes a primary suction port and a primary discharge port, and is configured to compress the fluid sucked in through the primary suction port and discharge it through the primary discharge port.

[0060] The second compression unit 3 is disposed within the housing 1 and is arranged in sequence with the first compression unit 2 along the axial direction of the housing 1. The second compression unit 3 includes a secondary suction port and a secondary discharge port, and the secondary suction port is in fluid communication with the primary discharge port; the second compression unit 3 is configured to compress the fluid sucked in through the secondary suction port and discharge it through the secondary discharge port.

[0061] Wherein, the primary discharge port and the secondary discharge port are located between the primary suction port and the secondary suction port, and the direction from the primary suction port to the primary discharge port is the first direction.

[0062] The direction from the secondary suction port to the secondary discharge port is the second direction, and the second direction is opposite to the first direction.

[0063] The resultant force direction of the first compression unit 2 is from the discharge end to the suction end, that is, from the second end of the housing 1 to the first end of the housing 1; the resultant force direction of the second compression unit 3 is from the discharge end to the suction end, that is, from the first end of the housing 1 to the second end of the housing 1; the resultant force direction of the first compression unit 2 is opposite to the resultant force direction of the second compression unit 3, which can achieve the force balance of the compressor and improve the energy efficiency of the compressor.

[0064] In some embodiments, the compressor further includes a bearing block 4, and the bearing block 4 is disposed between the first compression unit 2 and the second compression unit 3.

[0065] In some embodiments, a first exhaust hole 44 is provided on the bearing block 4, and the primary discharge port, the first exhaust hole 44, and the secondary suction port are in fluid communication in sequence.

[0066] In some embodiments, a second exhaust hole 45 is further provided on the bearing block 4, an exhaust port 18 is provided on the housing 1, the exhaust port 18 is located on the side of the bearing block 4 close to the first compression unit 2, and the secondary discharge port, the second exhaust hole 45, and the exhaust port 18 are in fluid communication in sequence.

[0067] As Figure 2 and Figure 3 shown, a primary compression chamber 11, a secondary compression chamber 12, a primary exhaust chamber 13, and a secondary exhaust chamber 14 are formed within the housing 1.

[0068] As Figure 1 shown, the housing 1 includes a first end 15 and a second end 16 arranged along the axial direction. An air inlet 17 is provided at the first end 15 of the housing 1, and an exhaust port 18 is provided at a position of the housing 1 between the first end 15 and the second end 16.

[0069] The first compression unit 2 is arranged in the first-stage compression chamber 11 to form a first-stage compression section.

[0070] The second compression unit 3 is arranged in the second-stage compression chamber 12 to form a second-stage compression section.

[0071] The bearing housing 4 is arranged in the housing 1 and is located between the first end 15 and the second end 16 of the housing 1.

[0072] Among them, as Figure 2 and Figure 3 shown, the first-stage compression chamber 11, the second-stage exhaust chamber 14, and the exhaust port 18 are located between the bearing housing 4 and the first end 15 of the housing 1.

[0073] The second-stage compression chamber 12 and the first-stage exhaust chamber 13 are located between the bearing housing 4 and the second end 16 of the housing 1.

[0074] The suction port 17, the first-stage compression chamber 11, the first-stage exhaust chamber 13, the second-stage compression chamber 12, the second-stage exhaust chamber 14, and the exhaust port 18 are connected in sequence along the fluid flow direction.

[0075] In the above embodiment, the suction end of the first-stage compression section is located on one side of the bearing housing 4 close to the first end 15 of the housing 15, and the exhaust end of the first-stage compression section is located on one side of the bearing housing 4 close to the second end 16 of the housing 15. The suction end of the second-stage compression section is located on one side of the bearing housing 4 close to the second end 16 of the housing 15, and the exhaust end of the second-stage compression section is located on one side of the bearing housing 4 close to the first end 15 of the housing 15.

[0076] Therefore, as Figure 3 shown, the suction ends of both the first-stage compression section and the second-stage compression section are located at both ends of the housing 1, and the exhaust ends of both the first-stage compression section and the second-stage compression section are located in the middle of the housing 1 (between the first end 15 and the second end 16 of the housing 1). The resultant force direction F1 of the first-stage compression section is from the exhaust end to the suction end. The resultant force direction F2 of the second-stage compression section is from the exhaust end to the suction end. The resultant force direction F1 of the first-stage compression section is opposite to the resultant force direction F2 of the second-stage compression section, which can achieve the force balance of the compressor and improve the energy efficiency of the compressor.

[0077] In the above embodiment, by reasonably arranging the suction end and the exhaust end of the first-stage compression section, and the suction end and the exhaust end of the second-stage compression section, the force balance of the compressor can be achieved. Therefore, there is no need to set too many bearing housings 4 to balance the axial force, and only one bearing housing 4 is required. The structure of the compressor is compact, reducing the cost and size of the compressor, reducing the structural redundancy of the compressor, reducing the loss of the compressor, and improving the energy efficiency of the compressor.

[0078] In the above embodiment, the compressor includes a first-stage compression section and a second-stage compression section, which is applicable to both low-pressure difference working conditions and high-pressure difference working conditions, and can meet the requirements of various working conditions.

[0079] In some embodiments, the first compression unit 2 includes two first rotors 21 that mesh with each other. The second compression unit 3 includes two second rotors 31 that mesh with each other. One of the two first rotors 21 is connected to one of the two second rotors 31 and is located on the same axis L. Optionally, the axis L is the central axis of the housing 1. The other of the two first rotors 21 is not collinear with the other of the two second rotors 31.

[0080] The first rotor 21 and the second rotor 31 located on the axis L are connected and share a bearing housing 4, which can reduce the components of the compressor, lower the cost of the compressor, and improve the performance and reliability of the compressor.

[0081] The first rotor 21 and the second rotor 31 located on the axis L are connected and located on the same axis L. The axial forces of the two-stage rotors both point to the suction end and are in opposite directions. The radial forces both point from the male rotor side to the female rotor side and are in opposite directions, which can achieve the force balance of the compressor.

[0082] As Figure 3 shown, in some embodiments, the first rotor 21 located on the axis L includes a first rotating shaft 213 and a first spiral part 214. The second rotor 31 located on the axis L includes a second rotating shaft 313 and a second spiral part 314. The first rotating shaft 213 and the second rotating shaft 313 are coaxially and integrally arranged to form a single rotating shaft 6.

[0083] In some embodiments, the compressor further includes a driving member 5, and the driving member 5 is drivingly connected to the single rotating shaft 6. Adopting the structure of directly driving the rotor by the single rotating shaft 6 can reduce the loss of transmission efficiency, improve the energy efficiency; reduce the operating components of the compressor, enhance the performance and reliability of the compressor, and effectively reduce the cost of the compressor.

[0084] Optionally, the driving member 5 includes a motor, and the single rotating shaft 6 is the output shaft of the motor.

[0085] As Figure 3 shown, in some embodiments, the first spiral part 214 is integrally formed on the single rotating shaft 6, and the second spiral part 314 is detachably arranged on the single rotating shaft 6.

[0086] Alternatively, the second spiral part 314 is integrally formed on the single rotating shaft 6, and the first spiral part 214 is detachably arranged on the single rotating shaft 6, which is not shown in the figure.

[0087] Alternatively, both the first spiral part 214 and the second spiral part 314 are detachably arranged on the single rotating shaft 6, which is not shown in the figure.

[0088] In the above embodiments, at least one of the first helical portion 214 and the second helical portion 314 located on the single-rotor rotating shaft 6 is detachably connected to the single-rotor rotating shaft 6, which is beneficial to the installation of the first rotor 21 and the second rotor 31.

[0089] Of course, both the first helical portion 214 and the second helical portion 314 can be integrally formed on the single-rotor rotating shaft 6. In order to realize the installation of the first rotor 21 and the second rotor 31, the size of the hole on the bearing seat 4 can be increased, and corresponding seals or sealing structures can be provided.

[0090] Optionally, the material of the single-rotor rotating shaft 6 includes metal materials or non-metallic materials with low vibration and low noise, etc.

[0091] In some embodiments, the central axis of the other one of the two first rotors 21 forms a first plane with the axis L, and the central axis of the other one of the two second rotors 31 forms a second plane with the axis L. The angle between the first plane and the second plane is greater than zero and less than or equal to 180 degrees.

[0092] In some embodiments, the angle between the first plane and the second plane is 180 degrees. Optionally, as Figure 1 shown, the two first rotors 21 and the two second rotors 31 are located on the same horizontal plane. Or, the two first rotors 21 and the two second rotors 31 are arranged vertically, that is, the other one of the two first rotors 21 is located above or below the axis L, and correspondingly, the other one of the two second rotors 31 is located below or above the axis L.

[0093] In some embodiments, the angle between the first plane and the second plane is 90 degrees. Optionally, the other one of the two first rotors 21 is located on one side in the horizontal direction of the axis L, and the other one of the two second rotors 31 is located below or above the axis L. Or, the other one of the two first rotors 21 is located above or below the axis L, and the other one of the two second rotors 31 is located on one side in the horizontal direction of the axis L.

[0094] The axis L, the other one of the two first rotors 21, and the other one of the two second rotors 31 can have various arrangement manners. It only needs to correspondingly adjust the positions of the air inlet and the exhaust cavity (the primary exhaust cavity 13 is communicated with the primary exhaust port, the secondary exhaust cavity 14 is communicated with the secondary exhaust port, and the primary exhaust cavity 13 and the secondary exhaust cavity 14 are located between the primary air inlet and the secondary air inlet), and the force balance can also be achieved. After the force balance, the number of compressor bearings is significantly reduced, and the cost is reduced.

[0095] In some embodiments, the compressor further includes a driving member 5, and the driving member 5 is drivingly connected to the first rotor 21 located on the axis L. The driving member 5 directly drives the first rotor 21, which can reduce the loss of transmission efficiency and improve the energy efficiency.

[0096] In some embodiments, the two first rotors 21 are respectively a first male rotor 211 and a first female rotor 212, and the two second rotors 31 are respectively a second male rotor 311 and a second female rotor 312. The first male rotor 211 is connected to the second male rotor 311 and is located on the same axis L.

[0097] In some embodiments, the compressor further includes a driving member 5, and the driving member 5 is drivingly connected to the first male rotor 211.

[0098] As Figure 1 、 Figure 3 、As Figure 4 、 Figure 5a 、 Figure 5b And Figure 6 As shown, in some embodiments, the bearing housing 4 is provided with a first hole 41, and one end of the first rotor 21 located on the axis L and one end of the second rotor 31 are both inserted into the first hole 41 and are connected to each other.

[0099] Optionally, the first end of the first rotor 21 located on the axis L is located between the bearing housing 4 and the first end 15 of the housing 1, and the second end of the first rotor 21 located on the axis L is inserted into the first hole 41.

[0100] The first end of the second rotor 31 located on the axis L is located between the bearing housing 4 and the second end 16 of the housing 1, and the second end of the second rotor 31 located on the axis L is inserted into the first hole 41.

[0101] Therefore, the second ends of the first rotor 21 and the second rotor 31 located on the axis L are both inserted into the first hole 41 and are connected to each other.

[0102] The first rotor 21 and the second rotor 31 located on the axis L share the bearing housing 4, which can reduce the moving parts of the compressor, lower the cost of the compressor, and improve the performance and reliability of the compressor.

[0103] In some embodiments, the bearing housing 4 is provided with a second hole 42 and a third hole 43.

[0104] The first end of the first rotor 21 not located on the axis L is located between the bearing housing 4 and the first end 15 of the housing 1, and the second end of the first rotor 21 not located on the axis L passes through the second hole 42 and is located between the bearing housing 4 and the second end 16 of the housing 1.

[0105] The first end of the second rotor 31 not located on the axis L is located between the bearing housing 4 and the second end 16 of the housing 1, and the second end of the second rotor 31 not located on the axis L passes through the third hole 43 and is located between the bearing housing 4 and the first end 15 of the housing 1.

[0106] The two first rotors 21 and the two second rotors 31 share the bearing housing 4, which can effectively reduce the moving parts of the compressor, lower the cost of the compressor, and improve the performance and reliability of the compressor.

[0107] In some embodiments, as Figure 5a shown, the bearing housing 4 is provided with a first exhaust hole 44 that communicates the primary compression chamber 11 and the primary exhaust chamber 13. As Figure 5b shown, the bearing housing 4 is further provided with a second exhaust hole 45 that communicates the secondary compression chamber 12 and the secondary exhaust chamber 14. The first exhaust hole 44 is close to the second hole 42, and the second exhaust hole 45 is close to the third hole 43.

[0108] As Figure 4 shown, a first exhaust flow channel 46 is provided at a position corresponding to the first exhaust hole 44 on the bearing housing 4, and the first exhaust flow channel 46 communicates with the primary exhaust chamber 13. A second exhaust flow channel 47 is provided at a position corresponding to the second exhaust hole 45 on the bearing housing 4, and the second exhaust flow channel 47 communicates with the secondary exhaust chamber 14.

[0109] Optionally, the first hole 41 is provided at the center of the bearing housing 4, and the second hole 42 and the third hole 43 are respectively located on both sides of the first hole 41.

[0110] The embodiments of the present disclosure adopt an arrangement method in which the primary exhaust and the secondary exhaust are in the middle, and the primary suction and the secondary suction are on both sides to achieve force balance. For a tandem two-stage compressor, an equal pressure ratio design method is generally adopted, that is, the optimal theoretical intermediate pressure where P0 is the pressure at the suction port of the compressor, and P1 is the pressure at the exhaust port of the compressor. At this time, the pressure ratios of the two stages are the same, but the pressure difference is generally higher for the secondary than the primary. Therefore, the problem of leakage of the secondary exhaust to the primary exhaust also needs to be considered.

[0111] Based on this, as Figure 4 and Figure 6 shown, the inner wall of the first hole 41 is provided with a first comb tooth seal structure 48 and a second comb tooth seal structure 49 to prevent the leakage of the secondary exhaust to the primary exhaust and improve the energy efficiency of the compressor. Among them, the first comb tooth seal structure 48 is used to seal the first rotor 21 located on the axis L, and the second comb tooth seal structure 49 is used to seal the second rotor 31 located on the axis L. Neither the first rotor 21 nor the second rotor 31 located on the axis L needs to be provided with a bearing at the first hole 41.

[0112] Since the first rotating shaft 213 of the first rotor 21 and the second rotating shaft 313 of the second rotor 31 located on the axis L are coaxially and integrally arranged to form a single rotating shaft 6, the first comb tooth seal structure 48 and the second comb tooth seal structure 49 are both used to seal the single rotating shaft 6.

[0113] Optionally, both the first comb tooth seal structure 48 and the second comb tooth seal structure 49 can be provided on the single-rotor shaft 6.

[0114] In some embodiments, both the first comb tooth seal structure 48 and the second comb tooth seal structure 49 include helical tooth grooves, and the rotation direction of the helical tooth grooves of the first comb tooth seal structure 48 is opposite to the rotation direction of the helical tooth grooves of the second comb tooth seal structure 49.

[0115] At the exhaust end of the two-stage male rotor, two sets of helical tooth grooves with opposite directions are provided in the first hole 41 of the bearing housing 4, and the inclined surface directions thereof both point to their respective corresponding exhaust high-pressure sides, which can ensure that the secondary exhaust will not leak to the primary exhaust, improving the energy efficiency of the compressor.

[0116] Of course, to avoid the secondary exhaust from leaking to the primary exhaust, the rotor displacement can also be matched, or a volume adjustment device such as a slide valve or a plunger can be provided at the secondary stage to reduce the secondary exhaust pressure difference and reduce the intermediate leakage.

[0117] As Figure 4 shown, a bearing for supporting the first rotor 21 not located on the axis L is provided in the second hole 42. A bearing for supporting the second rotor 31 not located on the axis L is provided in the third hole 43.

[0118] The opening sizes of the first hole 41, the second hole 42, the third hole 43, the first exhaust hole 44, and the second exhaust hole 45 on the bearing housing 4 can be adjusted according to different working conditions. By using a set of bearing housing molds and adaptively adjusting the opening sizes of the above holes, compressors with different working conditions and compression ratio requirements can be applied.

[0119] As Figure 3 shown, in some embodiments, the primary exhaust cavity 13 is located below the central axis of the housing 1, and the secondary exhaust cavity 14 is located above the central axis of the housing 1.

[0120] In Figure 3 the shown embodiment, the two-stage rotors are both horizontally arranged. At this time, after the suction air cools the motor in the motor cavity, it sucks air from above the first rotor 21, exhausts air from below the first rotor 21, then sucks air from below the second rotor 31, exhausts air from above the second rotor 31, and finally exhausts air from the exhaust port 18 provided on the primary housing. At this time, the total force directions of the first rotor 21 and the second rotor 31 are both from the exhaust end to the suction end, and the force is balanced.

[0121] In some embodiments, the compressor further includes a driving member 5 configured to provide compression power to the first compression unit 2 and the second compression unit 3. The housing 1 includes a first housing section 101, a second housing section 102, and a third housing section 103 connected in sequence along the axial direction. The driving member 5 and the first compression unit 2 are disposed within the first housing section 101, the second compression unit 3 is disposed within the third housing section 103, and the second housing section 102 and the bearing seat 4 are integrally formed.

[0122] The first compression unit 2 and the second compression unit 3 share the bearing seat 4, which can effectively reduce the number of housing sections of the housing 1, reduce the number of positioning sections, and lower the deviation risk and cost.

[0123] In some embodiments, the integrated bearing seat 4 is connected to the first housing section 101 and the second housing section 102 respectively by positioning pins.

[0124] In some embodiments, a wiring member 7 is provided at the first end 15 of the housing 1, and the wiring member 7 is used to connect the driving member 5 (motor) to the outside.

[0125] In some embodiments, the housing 1 further includes an end cover 104 and a cover plate 105. The end cover 104 is disposed at the end of the first housing section 101 to form the first end 15 of the housing 1, and the air inlet 17 is provided on the end cover 104. The cover plate 105 is disposed at the end of the second housing section 102 to form the second end 16 of the housing 1.

[0126] The following Figures 1 to 6 describes some specific embodiments of the compressor in conjunction with the attached

[0127] As Figure 1 shown, the housing 1 of the compressor includes a first housing section 101, a second housing section 102, and a third housing section 103 connected in sequence along the axial direction, and further includes an end cover 104 and a cover plate 105. The end cover 104 is disposed at the end of the first housing section 101 to form the first end 15 of the housing 1. The cover plate 105 is disposed at the end of the second housing section 102 to form the second end 16 of the housing 1.

[0128] The air inlet 17 is provided on the end cover 104.

[0129] The driving member 5, the primary compression chamber 11, the first compression unit 2, and the secondary exhaust chamber 14 are disposed within the first housing section 101, and the exhaust port 18 is provided on the first housing section 101.

[0130] The secondary compression chamber 12, the second compression unit 3, and the primary exhaust chamber 13 are disposed within the third housing section 103.

[0131] The second housing section 102 and the bearing seat 4 are integrally formed.

[0132] The first compression unit 2 includes a first male rotor 211 and a first female rotor 212, and the second compression unit 3 includes a second male rotor 311 and a second female rotor 312.

[0133] The first male rotor 211 includes a first rotating shaft 213 and a first spiral part 214. The second male rotor 311 includes a second rotating shaft 313 and a second spiral part 314. The first rotating shaft 213 and the second rotating shaft 313 are coaxially and integrally arranged to form a single rotating shaft 6. The driving member 5 includes a motor, and the single rotating shaft 6 is the output shaft of the motor.

[0134] The single rotating shaft 6 is located on the axis L. Further, the single rotating shaft 6 is located on the central axis of the housing 1. The first male rotor 211 and the second male rotor 311 are located on the axis L, and the first female rotor 212 and the second female rotor 312 are respectively located on both sides in the horizontal direction of the axis L. The first female rotor 212 and the axis L form a first plane, the second female rotor 312 and the axis L form a second plane, and the included angle between the first plane and the second plane is 180 degrees.

[0135] The first-stage exhaust cavity 13 is located on the lower side of the central axis of the housing 1, and the second-stage exhaust cavity 14 is located on the upper side of the central axis of the housing 1.

[0136] The air flow at the air inlet 17 cools the motor after passing through the motor cavity, is then inhaled from above the first male rotor 211 and the first female rotor 212, is discharged from below the first male rotor 211 and the first female rotor 212 to the first-stage exhaust cavity 13. Then, the air flow in the first-stage exhaust cavity 13 is inhaled from below the second male rotor 311 and the second female rotor 312, is discharged from above the second male rotor 311 and the second female rotor 312 to the second-stage exhaust cavity 14, and finally is exhausted from the exhaust port 18 provided on the first housing section 101. That is to say, the suction sides of the two-stage rotors are both located at the ends of the housing 1, and the exhaust sides are both relatively located in the middle of the housing 1.

[0137] Among them, a first support assembly 8 is provided at the suction end of the first male rotor 211. At the first hole 41 of the bearing seat 4 at the exhaust end of the first male rotor 211, no bearing needs to be provided. The first male rotor 211 is connected to the motor.

[0138] A first support assembly 8 is provided at the suction end of the first female rotor 212. A second support assembly 9 is provided at the exhaust end of the first female rotor 212.

[0139] A second support assembly 9 is provided at the suction end of the second male rotor 311. The exhaust end of the second male rotor 311 is arranged at the first hole 41 of the bearing seat 4, and no bearing needs to be provided.

[0140] A second support assembly 9 is provided at the suction end of the second female rotor 312. A first support assembly 8 is provided at the exhaust end of the second female rotor 312.

[0141] The first support assembly 8 includes a radial bearing and an oil ring.

[0142] The second support assembly 9 includes a radial bearing, an axial bearing, and a lock nut.

[0143] In the above embodiments, the radial bearing is fixed to the housing 1 through a radial bearing seat. The oil ring is used to guide lubricating oil to lubricate the radial bearing and also serves to support the outer ring of the bearing.

[0144] As Figure 6 shown, a limiting step 61 for cooperating with the second support assembly 9 is further provided on the single-body rotating shaft 6.

[0145] Some embodiments further provide an air conditioner, which includes the above compressor.

[0146] In some embodiments, the compressor includes a screw compressor.

[0147] Based on the above embodiments of the present invention, without explicit negation, the technical features of one embodiment can be beneficially combined with one or more other embodiments.

[0148] Although some specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are only for illustration and not for limiting the scope of the present invention. Those skilled in the art should understand that the above embodiments can be modified or partial technical features can be equivalently replaced without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A compressor, characterized in that, Comprising: A housing (1) provided with an exhaust port (18) thereon; A first compression unit (2) disposed within the housing (1), the first compression unit (2) including a primary suction port and a primary exhaust port, the first compression unit (2) being configured to compress the fluid sucked in through the primary suction port and discharge it from the primary exhaust port; And A second compression unit (3) disposed within the housing (1) and arranged axially along the housing (1) in sequence with the first compression unit (2), the second compression unit (3) including a secondary suction port and a secondary exhaust port, the secondary suction port being in fluid communication with the primary exhaust port; the second compression unit (3) being configured to compress the fluid sucked in through the secondary suction port and discharge it from the secondary exhaust port; Wherein, the primary exhaust port and the secondary exhaust port are located between the primary suction port and the secondary suction port, the direction from the primary suction port to the primary exhaust port is the first direction; the direction from the secondary suction port to the secondary exhaust port is the second direction, and the second direction is opposite to the first direction; Including a bearing seat (4) disposed between the first compression unit (2) and the second compression unit (3); a primary compression chamber (11), a secondary compression chamber (12), a primary exhaust chamber (13) and a secondary exhaust chamber (14) are formed within the housing (1), the housing (1) includes a first end (15) and a second end (16) arranged axially, and a suction port (17) is provided at the first end (15) of the housing (1); the first compression unit (2) is disposed within the primary compression chamber (11); the second compression unit (3) is disposed within the secondary compression chamber (12); Wherein, the primary compression chamber (11), the secondary exhaust chamber (14) and the exhaust port (18) are located between the bearing seat (4) and the first end (15) of the housing (1), the secondary compression chamber (12) and the primary exhaust chamber (13) are located between the bearing seat (4) and the second end (16) of the housing (1), and the suction port (17), the primary compression chamber (11), the primary exhaust chamber (13), the secondary compression chamber (12), the secondary exhaust chamber (14) and the exhaust port (18) are in fluid communication in sequence along the fluid flow direction; The bearing seat (4) is provided with a first exhaust hole (44) and a second exhaust hole (45); The primary exhaust port, the first exhaust hole (44) and the secondary suction port are in fluid communication in sequence; The exhaust port (18) is located on the side of the bearing seat (4) close to the first compression unit (2), and the secondary exhaust port, the second exhaust hole (45) and the exhaust port (18) are in fluid communication in sequence.

2. The compressor according to claim 1, characterized in that, The first compression unit (2) includes two first rotors (21) that mesh with each other, and the second compression unit (3) includes two second rotors (31) that mesh with each other; one of the two first rotors (21) is connected to one of the two second rotors (31) and is located on the same axis (L), and the other of the two first rotors (21) is not collinear with the other of the two second rotors (31).

3. The compressor according to claim 2, characterized in that, The first rotor (21) located on the axis (L) includes a first rotating shaft (213) and a first spiral part (214); the second rotor (31) located on the axis (L) includes a second rotating shaft (313) and a second spiral part (314), and the first rotating shaft (213) and the second rotating shaft (313) are coaxially and integrally arranged to form a single rotating shaft (6).

4. The compressor according to claim 3, characterized in that, The first spiral part (214) is integrally formed on the single rotating shaft (6), and the second spiral part (314) is detachably arranged on the single rotating shaft (6); alternatively, the second spiral part (314) is integrally formed on the single rotating shaft (6), and the first spiral part (214) is detachably arranged on the single rotating shaft (6).

5. The compressor according to claim 2, wherein, The central axis of the other of the two first rotors (21) forms a first plane with the axis (L), and the central axis of the other of the two second rotors (31) forms a second plane with the axis (L), and the angle between the first plane and the second plane is greater than zero and less than or equal to 180 degrees.

6. The compressor according to claim 2, wherein It further includes a driving member (5), and the driving member (5) is drivingly connected to the first rotor (21) located on the axis (L).

7. The compressor according to claim 2, characterized in that, The two first rotors (21) are respectively a first male rotor (211) and a first female rotor (212), the two second rotors (31) are respectively a second male rotor (311) and a second female rotor (312), and the first male rotor (211) is connected to the second male rotor (311) and is located on the same axis (L).

8. The compressor according to claim 7, characterized in that, It further includes a driving member (5), and the driving member (5) is drivingly connected to the first male rotor (211).

9. The compressor according to claim 2, wherein, It further includes a bearing seat (4) provided between the first compression unit (2) and the second compression unit (3); a first hole (41) is provided on the bearing seat (4), and one end of the first rotor (21) and one end of the second rotor (31) located on the axis (L) are both inserted into the first hole (41) and are connected to each other.

10. The compressor according to claim 9, characterized in that, The bearing seat (4) is provided with a second hole (42) and a third hole (43). The first end of the first rotor (21) not located on the axis (L) is located between the bearing seat (4) and the first end (15) of the housing (1), and the second end of the first rotor (21) not located on the axis (L) passes through the second hole (42) and is located between the bearing seat (4) and the second end (16) of the housing (1). The first end of the second rotor (31) not located on the axis (L) is located between the bearing housing (4) and the second end (16) of the housing (1), and the second end of the second rotor (31) not located on the axis (L) passes through the third hole (43) and is located between the bearing housing (4) and the first end (15) of the housing (1).

11. The compressor according to claim 1, wherein The bearing housing (4) is provided with a first exhaust hole (44) communicating the primary compression chamber (11) and the primary exhaust chamber (13), and the bearing housing (4) is further provided with a second exhaust hole (45) communicating the secondary compression chamber (12) and the secondary exhaust chamber (14).

12. The compressor according to claim 1, characterized in that, The primary exhaust chamber (13) is located below the central axis of the housing (1), and the secondary exhaust chamber (14) is located above the central axis of the housing (1).

13. The compressor according to claim 1, characterized in that, It further includes a driving member (5) and a bearing housing (4) provided between the first compression unit (2) and the second compression unit (3). The driving member (5) is configured to provide compression power to the first compression unit (2) and the second compression unit (3). The housing (1) includes a first housing section (101), a second housing section (102), and a third housing section (103) sequentially connected along the axial direction. The driving member (5) and the first compression unit (2) are provided in the first housing section (101), the second compression unit (3) is provided in the third housing section (103), and the second housing section (102) and the bearing housing (4) are integrally formed.

14. The compressor according to claim 13, characterized in that, The housing (1) further includes an end cover (104) and a cover plate (105). The end cover (104) is provided at the end of the first housing section (101) to form the first end (15) of the housing (1), and the cover plate (105) is provided at the end of the second housing section (102) to form the second end (16) of the housing (1).

15. An air conditioner, characterized in that, It includes a compressor according to any one of claims 1 to 14.

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