Screw compressors and air conditioners

Abstract

The present disclosure provides a screw compressor and an air conditioner. The screw compressor includes: a compressor housing, having a compression part installation space, a drive part installation space, a compressor inlet and a compressor outlet; a compression part, which is arranged in the compression part installation space, and is used to compress the gas at the compressor inlet and output it from the compressor outlet, including a first compression unit and a second compression unit; and a drive part, which is arranged in the drive part installation space, including a motor rotor and a motor stator which is relatively fixed to the compressor housing and relatively rotatably sleeved on the outer periphery of the motor rotor; wherein the motor rotor is fixedly sleeved on the rotating shaft of the first male rotor, and the rotating shaft of the second male rotor is coaxially and integrally arranged with the rotating shaft of the first male rotor to form a single rotating shaft. The axial forces of the two male rotors of the screw compressor can be effectively balanced directly through the single rotating shaft, and the transmission loss can be effectively reduced, thereby improving the energy efficiency and reliability of the screw compressor.

Description

Technical Field

[0001] The present disclosure relates to the technical field of compressor equipment and air-conditioning equipment, and in particular to a screw compressor and an air-conditioner. Background Art

[0002] During the operation of the screw compressor, the axial force generated by the different suction and exhaust pressures at the axial ends of the compressor rotor and the radial force generated by the compressor rotor tooth shape, structure and other characteristics form the main loads of the screw compressor during operation.

[0003] In the related art, bearings are usually used to balance the force on the compressor rotor, but too many bearings lead to excessive operating losses and reduce the efficiency of the screw compressor.

[0004] The design of a single-unit two-stage screw compressor is based on the principle of axial force balance or decomposition. Two sets of compressor rotors with the same or opposite rotation directions are set. The two sets of compressor rotors are connected in series through a coupling. The first-stage compressor rotor is compressed and then the second-stage compressor rotor is compressed. The suction and exhaust pressure difference corresponding to the second-stage compressor rotor is reduced, which can reduce the axial force carried by each. The axial force is balanced at the coupling by the relative suction. However, since the coupling actually mainly bears torque, the force on the compressor rotor cannot be completely balanced by the coupling. Multiple sets of bearings need to be set, and the setting of the coupling divides the compressor into multiple compressor casing sections, which has a high overall cost. Summary of the invention

[0005] The present disclosure aims to provide a screw compressor and an air conditioner, aiming to solve the axial force balance problem of a screw compressor including two compression units in the related art.

[0006] A first aspect of the present disclosure provides a screw compressor, comprising:

[0007] A compressor housing having a compression unit installation space and a drive unit installation space, and having a compressor inlet and a compressor outlet communicating with the compression unit installation space;

[0008] A compression unit, arranged in the compression unit installation space, for compressing the gas at the compressor inlet and outputting it from the compressor outlet, comprising a first compression unit and a second compression unit, wherein the first compression unit comprises a first male rotor and a first female rotor meshed with the first male rotor; the second compression unit comprises a second male rotor and a second female rotor meshed with the second male rotor; and

[0009] A driving part, arranged in the driving part installation space, comprising a motor rotor and a motor stator fixed relatively to the compressor housing and relatively rotatably sleeved on the outer periphery of the motor rotor;

[0010] Wherein, the motor rotor is fixedly mounted on the rotating shaft of the first male rotor, and the rotating shaft of the second male rotor is coaxially and integrally arranged with the rotating shaft of the first male rotor to form a single rotating shaft.

[0011] In the screw compressor of some embodiments, along the axial direction of the unit rotating shaft, the suction ends of the first compression unit and the second compression unit are adjacent to each other and the discharge ends are far away from each other.

[0012] In some embodiments of the screw compressor, the first compression unit and the second compression unit are connected in series.

[0013] In some embodiments of the screw compressor,

[0014] At least one of the spiral portion of the first male rotor and the spiral portion of the second male rotor is integrally formed with the single rotating shaft; or

[0015] At least one of the spiral portion of the first male rotor and the spiral portion of the second male rotor is a fitted spiral portion that is non-rotatably connected to the single body rotating shaft.

[0016] In some embodiments of the screw compressor, the exhaust end of the sleeved spiral part and the single body rotating shaft are axially limited by a step surface to prevent the sleeved spiral part from moving toward the suction end of the sleeved spiral part, and the single body rotating shaft and the suction end of the sleeved spiral part are axially fixed by an axial positioning part.

[0017] In the screw compressor of some embodiments, the axial positioning portion includes:

[0018] A stopper abuts against the end surface of the air suction end of the sleeve spiral portion and the step surface of the monomer rotating shaft located on the air suction end of the sleeve spiral portion; and

[0019] A connecting member connects the stopper to the sleeve spiral portion and / or the single body rotating shaft.

[0020] In some embodiments of the screw compressor, an installation cavity isolation portion is included. Along the axial direction of the single body rotating shaft, the drive unit installation space is located at one end of the compression unit installation space. The installation cavity isolation portion is arranged between the first compression unit and the second compression unit to divide the compression unit installation space into a first installation cavity and a second installation cavity. The single body rotating shaft passes through the installation cavity isolation portion and is sealed and connected to the installation cavity isolation portion so as to be relatively rotatable. The installation cavity isolation portion is provided with a connecting port for conveying the exhaust gas of the first compression unit to the second compression unit.

[0021] In the screw compressor of some embodiments, the single body rotating shaft and the mounting cavity isolation portion are sealed and connected in a relatively rotatable manner via a toothed sealing structure.

[0022] In some embodiments of the screw compressor, the first compression unit is located between the driving portion and the second compression unit.

[0023] In some embodiments of the screw compressor,

[0024] The first compression unit further includes a first inner shell, a first partition wall and an internal bearing seat, the first inner shell, the first partition wall and the internal bearing seat are fixed relative to the compressor outer shell, the internal bearing seat and the installation cavity isolation portion are respectively located at the axial ends of the first inner shell, the first positive rotor and the second negative rotor are located in a first rotor space surrounded by the internal bearing seat, the first inner shell and the installation cavity isolation portion, a first compression unit intake port is provided on the first inner shell, a first compression unit exhaust port is provided on the internal bearing seat and / or the first inner shell, the first partition wall is located between the compressor outer shell and the first inner shell, and divides the first installation cavity between the first inner shell and the internal bearing seat and the compressor outer shell into a first intake chamber and a first exhaust chamber, the first intake chamber is connected with the compressor inlet and the first compression unit intake port, and the first exhaust chamber is connected with the first compression unit exhaust port and the connecting port; and / or

[0025] The second compression unit also includes a second inner shell and a second partition wall fixed relative to the compressor outer shell, the second inner shell is arranged in the second installation cavity, the second positive rotor and the second negative rotor are located in the second rotor space surrounded by the installation cavity isolation part, the second inner shell and the compressor outer shell, a second compression unit air inlet and a second compression unit exhaust port are provided on the second inner shell, the second partition wall is located between the compressor outer shell and the second inner shell, and divides the second installation cavity between the second inner shell and the compressor outer shell into a second intake cavity and a second exhaust cavity, the second intake cavity is connected with the connecting port and the second compression unit intake cavity, and the second exhaust cavity is connected with the second compression unit exhaust port and the compressor outlet.

[0026] In some embodiments of the screw compressor,

[0027] The single rotating shaft is supported on the internal bearing seat and the compressor housing through bearings; and / or

[0028] The first female rotor is supported on the internal bearing seat and the mounting cavity isolation portion through a bearing;

[0029] The second female rotor is supported on the installation cavity partition and the compressor housing through bearings.

[0030] In some embodiments of the screw compressor, the axis of the first female rotor, the axis of the second female rotor and the axis of the single body rotating shaft are located in the same plane, and the axis of the first female rotor and the axis of the second female rotor are located on both sides of the axis of the single body rotating shaft.

[0031] In the screw compressor of some embodiments, the compressor housing includes four shell segments arranged in sequence along the axial direction of the unit rotating shaft, and the four shell segments include:

[0032] A first shell segment, wherein a first end of the first shell segment is closed, and the driving unit is installed in the first shell segment;

[0033] a second shell segment, wherein a first end of the second shell segment is connected to a second end of the first shell segment, the compressor inlet is arranged in the second shell segment, and the first compression unit is installed in the second shell segment;

[0034] a third shell segment, a first end of the third shell segment being connected to a second end of the second shell segment, and the second compression unit being installed in the third shell segment; and

[0035] A fourth shell segment, wherein the first end of the fourth shell segment is connected to the second end of the third shell segment, the second end of the fourth shell segment is closed, and a bearing cavity for accommodating a bearing supporting the single body rotating shaft and a bearing cavity for accommodating a bearing supporting the second female rotor are arranged in the fourth shell segment, and the compressor outlet is located on the fourth shell segment.

[0036] In the screw compressor of some embodiments, a cooling channel for the flow of a cooling fluid for cooling the driving part is provided on the first shell segment.

[0037] The present disclosure provides an air conditioner, comprising the screw compressor according to the first aspect of the present disclosure.

[0038] Based on the screw compressor provided by the present invention, the second positive rotor of the second compression unit of the compression part is arranged on the rotor shaft of the first positive rotor of the first compression unit. The rotating shaft of the first positive rotor and the rotating shaft of the second positive rotor form a single rotating shaft structure. The axial forces of the two positive rotors can be effectively balanced directly through the single rotating shaft.

[0039] The motor rotor of the driving unit is directly mounted on the single rotating shaft of the compression unit, and the driving unit and the compression unit form a direct drive. A shaft segment of the rotating shaft of the first positive rotor of the first compression unit serves as the driving shaft of the driving unit. The rotating shaft of the first positive rotor of the first compression unit and the rotating shaft of the second positive rotor of the second compression unit are coaxially arranged as a whole, instead of transmitting force through structures such as couplings, which can effectively reduce transmission losses and improve the energy efficiency and reliability of the screw compressor.

[0040] The setting of a single transmission shaft reduces the number of positioning sections of the rotating shafts of each male rotor of the driving part and the compression part, reduces the risk caused by positioning deviation, reduces the connecting components between the rotating shafts and the supporting components of each rotating shaft, makes the structure of the screw compressor compact, and helps to reduce the structural redundancy of the compressor and the cost of the compressor.

[0041] The air conditioner of the present disclosure includes the screw compressor of the present disclosure and has the advantages of the screw compressor of the present disclosure.

[0042] Other features and advantages of the present disclosure will become apparent from the following detailed description of exemplary embodiments of the present disclosure with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The drawings described herein are used to provide a further understanding of the present disclosure and constitute a part of the present application. The illustrative embodiments of the present disclosure and their descriptions are used to explain the present disclosure and do not constitute an improper limitation on the present disclosure. In the drawings:

[0044] Figure 1 It is a schematic diagram of the cross-sectional structure of the screw compressor in one direction according to an embodiment of the present disclosure.

[0045] Figure 2 for Figure 1 The cross-sectional structure diagram of the screw compressor of the illustrated embodiment is shown in another direction.

[0046] Figure 3 for Figure 1 The AA-sectional structural schematic diagram of the screw compressor of the illustrated embodiment.

[0047] Figure 4 for Figure 1 The schematic diagram of the BB-sectional structure of the screw compressor of the illustrated embodiment.

[0048] Figure 5 The present invention is a schematic diagram of the cross-sectional structure of the second male rotor of the second compression unit of the screw compressor according to an embodiment of the present invention.

[0049] Figure 6 for Figure 5 A schematic structural diagram of the stopper of the second male rotor of the illustrated embodiment. DETAILED DESCRIPTION

[0050] The following will be combined with the drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all of 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 disclosure and its application or use. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0051] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, numerical expressions and numerical values ​​do not limit the scope of the present disclosure. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0052] In the description of the present disclosure, it should be understood that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present disclosure.

[0053] In the description of the present disclosure, it is necessary to understand that the orientation or positional relationship indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present disclosure and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present disclosure; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0054] Figures 1 to 6 Schematic diagram of the structure of the screw compressor of some embodiments of the present disclosure. Figures 1 to 6 As shown, the screw compressor of the embodiment of the present disclosure mainly includes a compressor housing 1, a compression part 2 and a driving part 3.

[0055] like Figures 1 to 4As shown, the compressor housing 1 has a compression part installation space C1 and a driving part installation space C2, and has a compressor inlet 1A and a compressor outlet 1B communicating with the compression part installation space C1.

[0056] The compression part 2 is arranged in the compression part installation space C1, and is used to compress the gas at the compressor inlet 1A and output it from the compressor outlet 1B. The compression part 2 includes a first compression unit 21 and a second compression unit 22. The first compression unit 21 includes a first male rotor 211 and a first female rotor 212 meshed with the first male rotor 211. The second compression unit 22 includes a second male rotor 221 and a second female rotor 222 meshed with the second male rotor 221.

[0057] The driving part 3 is arranged in the driving part installation space C2. The driving part 3 includes a motor rotor 31 and a motor stator 32 which is relatively fixed to the compressor housing 1 and relatively rotatably sleeved on the outer periphery of the motor rotor 31. The motor rotor 31 is fixedly sleeved on the rotating shaft of the first male rotor 211. The rotating shaft of the second male rotor 221 is coaxially arranged with the rotating shaft of the first male rotor 211 to form a single rotating shaft.

[0058] The second positive rotor 221 of the second compression unit 22 of the compression part 2 of the screw compressor of the disclosed embodiment is in the form of being arranged on the rotor shaft 2111 of the first positive rotor 211 of the first compression unit 21. The rotating shaft 2111 of the first positive rotor 211 and the rotating shaft 2211 of the second positive rotor 221 form a single rotating shaft structure, and the axial forces of the two positive rotors can be effectively balanced directly through the single rotating shaft.

[0059] The motor rotor 31 of the driving part 3 is directly mounted on the single rotating shaft of the compression part 2, and the driving part 3 and the compression part 2 form a direct drive. A shaft segment of the rotating shaft 2111 of the first positive rotor 211 of the first compression unit 21 serves as the driving shaft of the driving part 3. The rotating shaft 2111 of the first positive rotor 211 of the first compression unit 21 and the rotating shaft 2211 of the second positive rotor 221 of the second compression unit 22 are coaxially integrated to form a single rotating shaft, instead of transmitting force through structures such as couplings, which can effectively reduce transmission losses and improve the energy efficiency and reliability of the screw compressor.

[0060] The setting of a single transmission shaft reduces the number of positioning sections of the rotating shafts of each male rotor of the driving part and the compression part, reduces the risk caused by positioning deviation, reduces the connecting components between each rotating shaft and the supporting components of each rotating shaft, and the screw compressor has a compact structure, which is conducive to reducing the structural redundancy of the compressor and the cost of the compressor.

[0061] like Figures 1 to 4As shown, in some embodiments, along the axial direction of the monomer rotating shaft, the suction ends of the first compression unit 21 and the second compression unit 22 are adjacent and the exhaust ends are far away from each other. This arrangement is conducive to the axial force generated by the first compression unit 21 and the second compression unit 22 during the operation of the screw compressor being directed from the exhaust ends of the first compression unit 21 and the second compression unit 22 to the suction ends, respectively, and finally borne by the monomer rotating shaft, which is conducive to reducing the number and / or bearing capacity of thrust bearings, and is also conducive to the compact structure of the screw compressor and reducing the cost of the screw compressor.

[0062] like Figures 1 to 4 As shown, in some embodiments, the first compression unit 21 and the second compression unit 22 are connected in series. For example, the gas is compressed in the first compression unit 21, and the gas after the first compression enters the second compression unit 22 for secondary compression.

[0063] In some embodiments, at least one of the spiral portion of the first male rotor 211 and the spiral portion of the second male rotor 221 is integrally formed with the single rotating shaft. Alternatively, at least one of the spiral portion of the first male rotor 211 and the spiral portion of the second male rotor 221 is a sleeve spiral portion that is non-rotatably connected to the single rotating shaft.

[0064] like Figures 1 to 4 As shown, in some embodiments, the spiral portion 2112 of the first positive rotor 211 is integrally formed with the rotating shaft 2111, that is, with the single rotating shaft, and the spiral portion 2212 of the second positive rotor 221 is a fitted spiral portion, which is non-rotatably connected to the rotating shaft 2211, that is, with the single rotating shaft.

[0065] like Figures 1 to 4 As shown, the first male rotor 211 of the first compression unit 21 of the driving part 3, the second male rotor 221 of the second compression unit 22 of the compression part 2 share a single rotating shaft. The spiral part 2112 of the first male rotor 211 is integrally manufactured with the single rotating shaft. The spiral part 2112 of the second male rotor 211 is a sleeve spiral part. Figures 1 to 4 In the embodiment shown, the spiral portion 2112 is mounted on the single rotating shaft by shrink fitting. The first female rotor 212 and the second female rotor 222 are both integral rotors made by integrating the rotating shaft and the spiral portion.

[0066] like Figure 5 As shown, in some embodiments, the exhaust end of the sleeve spiral part and the single body rotating shaft are axially limited by a step surface to prevent the sleeve spiral part from moving toward the suction end of the sleeve spiral part, and the single body rotating shaft and the suction end of the sleeve spiral part are axially fixed by an axial positioning part. This arrangement is conducive to reducing the number and / or load-bearing capacity of thrust bearings.

[0067] like Figure 5As shown, in some embodiments, the axial positioning portion includes, for example, a stopper and a connector. The stopper is attached to the end surface of the suction end of the sleeve spiral portion and the step surface of the monomer rotating shaft located at the suction end of the sleeve spiral portion. The connector connects the stopper to the sleeve spiral portion and / or the monomer rotating shaft.

[0068] Figure 5 and Figure 6 An example of a connection method between the spiral portion 2212 of the secondary male rotor 221 and the rotating shaft 2211 of the secondary male rotor 221 in some embodiments is shown. The rotating shaft 2211 of the secondary male rotor 221 and the rotating shaft 2111 of the primary male rotor 211 form a single rotating shaft. The spiral portion 2212 is a sleeved spiral portion, which forms a tight fit with the rotating shaft 2211, wherein a small gap or interference fit is left between the inner hole of the spiral portion 2212 and the single rotating shaft, and the spiral portion 2212 is sleeved on the rotating shaft 2211 by cold installation, and a step limit portion is provided at the spiral portion 2212 of the secondary male rotor 221 and the exhaust end of the rotating shaft 2211 (see FIG. 2 ). Figure 5 After the spiral part 2212 (in the middle S position) and the rotating shaft 2211 are assembled, the spiral part 2212 cannot move toward the suction end due to the setting of the step limiter. An axial positioning part is set at the suction end of the secondary male rotor 221. The axial positioning part includes a pressure plate 2213 as a stopper and a screw 2214 as a connecting part. Figure 6 As shown, the pressing plate 2213 is composed of two symmetrical semicircular rings 22131 and 22132, and each semicircular ring is provided with a mounting hole 2213A for passing the screw 2214. The pressing plate 2213 is embedded in the suction end face of the second male rotor 22, and the monomer rotating shaft here also has a step surface to limit the axial position of the pressing plate 2213 and the monomer rotating shaft. The screw 2214 is fixed to the end face of the spiral part 2212, so that the suction end of the spiral part 2212 can be limited to ensure that the spiral part 2212 of the second male rotor 22 does not move toward the exhaust end.

[0069] The pressing plate 2213 is configured as two semicircular rings, which is not limited by the diameter of the single rotating shaft. The pressing plate can also be configured as more ring segments.

[0070] Figures 5 and 6 The matching mode of the spiral portion 2212 and the rotating shaft 2211 in the illustrated embodiment is only one feasible locking mode. In an embodiment not shown in the figure, the spiral portion of the second male rotor and the rotating shaft can also be locked by means of threads, keys, etc., and can also be processed into an integrated two-stage male rotor, that is, the first male rotor and the second male rotor can be processed coaxially and integrally.

[0071] like Figures 1 to 4As shown, in some embodiments, the screw compressor includes a mounting chamber isolating portion 4. Along the axial direction of the monomer rotating shaft, the drive unit mounting space C2 is located at one end of the compression unit mounting space C1, and the mounting chamber isolating portion 4 is disposed between the first compression unit 21 and the second compression unit 22, dividing the compression unit mounting space C1 into a first mounting chamber C11 and a second mounting chamber C12. The monomer rotating shaft passes through the mounting chamber isolating portion 4 and is relatively rotatably sealed and connected to the mounting chamber isolating portion 4. The mounting chamber isolating portion 4 is provided with a connecting port 4A for conveying the exhaust gas of the first compression unit 21 to the second compression unit 22.

[0072] This arrangement facilitates the gas in the first compression unit 21 and the second compression unit 22 to flow between the first compression unit 21 and the second compression unit 22 according to a specified flow path, and is applicable to the case where the first compression unit 21 and the second compression unit 22 are connected in series. The screw compressor of the disclosed embodiment is a single-machine two-stage screw compressor. By installing the cavity isolation portion 4 and the connecting port 4A thereon, the fluid between the first compression unit 21 and the second compression unit 22 flows inside the compressor housing, and there is no need to set a medium-pressure fluid channel outside the screw compressor, making the structure of the screw compressor compact.

[0073] like Figures 1 to 4 As shown, in some embodiments, the single body rotating shaft and the mounting cavity isolation portion 4 are sealed and connected in a relatively rotatable manner via a toothed sealing structure 4B.

[0074] The installation cavity isolation part 4 may be a single body structure, or may be divided into a plurality of functional components according to the functions of the installation cavity isolation part 4, and the functional components are assembled and matched to form a complete installation cavity isolation part.

[0075] like Figures 1 to 4 As shown, in some embodiments, the first compression unit 21 is located between the driving unit 3 and the second compression unit 22. This arrangement facilitates fluid transfer between the first compression unit and the second compression unit, and the layout of the compression unit and the screw compressor is compact, which helps to reduce the number of bearings.

[0076] like Figures 1 to 4As shown, in some embodiments, the first compression unit 21 further includes a first inner shell 213, a first partition wall 214 and an internal bearing seat 215. The first inner shell 213, the first partition wall 214 and the internal bearing seat 215 are fixed relative to the compressor shell 1. The internal bearing seat 215 and the mounting cavity partition 4 are respectively located at the axial ends of the first inner shell 213. The first positive rotor 211 and the second negative rotor 222 are located in the first rotor space C111 surrounded by the internal bearing seat 215, the first inner shell 213 and the mounting cavity partition 4. The first compression unit suction port 21A is provided on the first inner shell 213. The first compression unit exhaust port 21B is provided on the internal bearing seat 215 and / or the first inner shell 213. The first partition wall 214 is located between the compressor shell 1 and the first inner shell 213, and divides the first mounting cavity C11 between the first inner shell 213 and the internal bearing seat 215 and the compressor shell 1 into a first suction cavity C112 and a first exhaust cavity C113. The first suction chamber C112 is communicated with the compressor inlet 1A and the first compression unit suction port 21A. The first discharge chamber C113 is communicated with the first compression unit discharge port 21B and the communication port 4A.

[0077] like Figures 1 to 4 As shown, in some embodiments, the second compression unit 22 also includes a second inner shell 223 and a second partition wall 224 fixed relative to the compressor housing 1. The second inner shell 223 is arranged in the second installation cavity C12. The second positive rotor 221 and the second negative rotor 222 are located in the second rotor space C121 surrounded by the installation cavity partition 4, the second inner shell 223 and the compressor housing 1. The second inner shell 223 is provided with a second compression unit air inlet 22A and a second compression unit exhaust port. The second partition wall 224 is located between the compressor housing 1 and the second inner shell 223, and divides the second installation cavity C12 between the second inner shell 223 and the compressor housing 1 into a second suction cavity C122 and a second exhaust cavity C123. The second suction cavity C122 is connected to the connecting port 4A and the second compression unit suction port 22A. The second exhaust cavity C123 is connected to the second compression unit exhaust port and the compressor outlet 1B.

[0078] The first compression unit and / or the second compression unit is configured to have a structure with an inner shell and a partition wall, which facilitates the flow of gas inside the screw compression part, shortens the flow path of the screw compressor, reduces gas flow losses, and makes the structure of the screw compressor more compact.

[0079] like Figure 2As shown, in some embodiments, the axis of the first female rotor 212, the axis of the second female rotor 222 and the axis of the monomer rotating shaft are located in the same plane, and the axis of the first female rotor 212 and the axis of the second female rotor 222 are located on both sides of the axis of the monomer rotating shaft. This arrangement is conducive to the balance of the radial force of the monomer rotating shaft, effectively improving the movement reliability of the two male rotors of the compression part 2, and also conducive to reducing the number and load-bearing capacity of the radial bearings, thereby making the screw compressor compact and reducing costs.

[0080] like Figures 1 to 4 As shown, in some embodiments, the single rotating shaft is supported on the internal bearing seat 215 and the compressor housing 1 through bearings; and / or the first female rotor 212 is supported on the internal bearing seat 215 and the mounting cavity isolation portion 4 through bearings; the second female rotor 222 is supported on the mounting cavity isolation portion 4 and the compressor housing 1 through bearings.

[0081] like Figures 1 to 4 As shown, in some embodiments, the compressor housing 1 includes four shell segments arranged sequentially along the axial direction of the single body rotating shaft, and the four shell segments include a first shell segment 11 , a second shell segment 12 , a third shell segment 13 and a fourth shell segment 14 .

[0082] The first end of the first shell segment 11 is closed, and the driving unit 3 is installed in the first shell segment 11. The first end of the second shell segment 12 is connected to the second end of the first shell segment 11, the compressor inlet 1A is arranged in the second shell segment 12, and the first compression unit 21 is installed in the second shell segment 12. The first end of the third shell segment 13 is connected to the second end of the second shell segment 12, and the second compression unit 22 is installed in the third shell segment 13. The first end of the fourth shell segment 14 is connected to the second end of the third shell segment 13, and the second end of the fourth shell segment 14 is closed. A bearing cavity for accommodating a bearing supporting a single rotating shaft and a bearing cavity for accommodating a bearing supporting the second female rotor 222 are arranged in the fourth shell segment 14, and the compressor outlet 1B is located on the fourth shell segment 14.

[0083] The above four shell sections are connected in sequence, and the main parts of the screw compressor are arranged in the compressor shell. There is no spacing between the shell sections of the compressor, and there is no need to set end plates between adjacent shell sections for closing different shell sections. The length of the single rotating shaft of the compression part is relatively short, which makes the screw compressor compact and reduces the cost.

[0084] The radial inner space of the second shell segment 12 and the third shell segment 13 constitutes the compression part installation space C1. The installation cavity partition 4 is arranged inside the compressor housing 1, located at the junction of the second shell segment 12 and the third shell segment 13, and divides the compression part installation space C1 into a first installation cavity C11 and a second installation cavity C12. The second shell segment 12 defines the first installation cavity C11 of the compression part installation space C1, and the compressor inlet 1A is arranged on the second shell segment 12. The third shell segment 13 defines the second installation cavity C12 of the compression part installation space C1.

[0085] like Figures 1 to 4 As shown, the internal bearing seat 215 is built into the first installation cavity C11. The internal bearing seat 215 is provided with a bearing cavity for accommodating a bearing supporting the single rotating shaft and a bearing cavity for accommodating a bearing supporting the first male rotor. The internal bearing seat 215 includes a support body 2151 and a bearing cover 2152. Each bearing cavity of the internal bearing seat 215 is provided on the support body 2151. The bearing device 2152 is used to close each bearing cavity of the internal bearing seat 215.

[0086] like Figures 1 to 4 As shown, the mounting cavity isolation portion 4 includes a sealing sleeve with the aforementioned toothed sealing structure 4B which is mounted on the single rotating shaft and a bearing plate which is mounted outside the sealing sleeve. The bearing plate is provided with bearing cavities for mounting the bearings for carrying the first female rotor 212 and the bearings for carrying the second female rotor 222.

[0087] like Figures 1 to 4 As shown, the fourth shell segment 14 is provided with a compressor outlet 1B and a bearing cavity for accommodating a bearing supporting a single rotating shaft and a bearing cavity for accommodating a bearing supporting a second female rotor. The fourth shell 14 includes a shell segment body 141 and a shell segment cover plate 142. Each bearing cavity of the fourth shell segment 14 is arranged in the shell segment body 141, and the shell segment cover plate 142 is used to close each bearing cavity of the fourth shell segment 14.

[0088] like Figures 1 to 4 As shown, in the embodiment of the present disclosure, the bearings supporting the rotating shafts of the compression part 2 include a first radial bearing 51, a second radial bearing 52, a first thrust bearing 53, a third radial bearing 54, a fourth radial bearing 55, a second thrust bearing 56, a fifth radial bearing 57, a sixth radial bearing 58 and a third thrust bearing 56.

[0089] The first radial bearing 51 is arranged on the inner bearing seat 215, and is used to support the shaft section of the single-body bearing between the driving part 3 and the first compression unit 21. The second radial bearing 52 and the first thrust bearing 53 are arranged in the bearing cavity of the fourth shell section 14, and are used to support the exhaust end of the second male rotor of the single-body rotating shaft, i.e. Figure 1 and Figure 2 The right end of .

[0090] The third radial bearing 54 is located on the bearing plate of the mounting cavity partition 4, and is used to support the suction end of the first female rotor 212. The fourth radial bearing 55 and the second thrust bearing 56 are arranged on the inner bearing seat 215, and are used to support the exhaust end of the first female rotor.

[0091] The fifth radial bearing 57 is located on the bearing plate of the mounting cavity isolation portion 4, and is used to support the suction end of the second female rotor 212. The sixth radial bearing 58 and the third thrust bearing 56 are arranged in the corresponding bearing cavity of the fourth shell segment 14, and are used to support the exhaust end of the second female rotor of the single rotating shaft, that is, Figure 1 and Figure 2 The right end of .

[0092] like Figure 1 As shown, in some embodiments, in order to prevent the drive unit 3 from over-temperature operation, a cooling channel 111 for the flow of cooling fluid for cooling the drive unit 3 is provided on the first shell segment 11. The drive unit 3 is cooled by an independent liquid spray cooling method, and the coolant enters and flows out of the drive unit installation space C2 through the cooling channel 111. In some embodiments not shown in the figure, other cooling structures such as air suction cooling can also be used to cool the drive unit 3.

[0093] According to the above description, in the screw compressor of the embodiment of the present disclosure, the drive unit, the first positive rotor and the second positive rotor share a single rotating shaft to form an integrated positive rotor direct drive structure, which can balance the forces on the two positive rotors of the compression unit, thereby reducing the deformation of the positive rotors and ensuring the reliable operation of the screw compressor. At the same time, since the positive rotors are balanced in force, there is no need to set thrust bearings at the suction ends of the two positive rotors, and thrust bearings can be set only at the exhaust end of the secondary positive rotor, which is beneficial to reducing moving parts, simplifying the compressor structure and reducing costs. The reduction of transmission parts of the drive unit and the two positive rotors of the screw compressor is beneficial to improving the efficiency of the screw compressor. Since the operating parts of the compressor are reduced, it is also beneficial to improve the reliability of the compressor.

[0094] Through simulation verification, under the condition that other conditions are the same, after adopting the male rotor structure of the embodiment of the present invention, the overall deflection deformation of the two male rotors of the compressor can be reduced by 2 to 8 μm, the maximum deformation can be reduced by 0.01 to 0.07 mm, the force can be reduced by 1 KN to 5 KN, and the performance of the screw compressor can be effectively improved.

[0095] The embodiment of the present disclosure also provides an air conditioner, comprising the screw compressor of the embodiment of the present disclosure. The air conditioner has the corresponding advantages of the screw compressor of the embodiment of the present disclosure.

[0096] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present disclosure rather than to limit it. Although the present disclosure has been described in detail with reference to the preferred embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present disclosure can still be modified or some technical features can be replaced by equivalents, which should all be included in the scope of the technical solution for protection requested by the present disclosure.

Claims

1. A screw compressor, characterized in that: include: A compressor housing (1) having a compression unit installation space (C1) and a drive unit installation space (C2), and having a compressor inlet (1A) and a compressor outlet (1B) communicated with the compression unit installation space (C1); A compression part (2) is arranged in the compression part installation space (C1) and is used for compressing the gas at the compressor inlet (1A) and outputting it from the compressor outlet (1B), comprising a first compression unit (21) and a second compression unit (22), wherein the first compression unit (21) comprises a first male rotor (211) and a first female rotor (212) meshing with the first male rotor (211); the second compression unit (22) comprises a second male rotor (221) and a second female rotor (222) meshing with the second male rotor (221); and A drive unit (3) is arranged in the drive unit installation space (C2), comprising a motor rotor (31) and a motor stator (32) fixed relative to the compressor housing (1) and sleeved on the outer periphery of the motor rotor (31) so as to be relatively rotatable; The motor rotor (31) is fixedly mounted on the rotating shaft of the first male rotor (211), and the rotating shaft of the second male rotor (221) is coaxially arranged with the rotating shaft of the first male rotor (211) to form a single rotating shaft; The screw compressor further comprises an installation cavity isolation portion (4); along the axial direction of the monomer rotating shaft, the drive unit installation space (C2) is located at one end of the compression unit installation space (C1); the installation cavity isolation portion (4) is arranged between the first compression unit (21) and the second compression unit (22), and divides the compression unit installation space (C1) into a first installation cavity (C11) and a second installation cavity (C12); the monomer rotating shaft passes through the installation cavity isolation portion (4) and is sealed and connected to the installation cavity isolation portion (4) so ​​as to be relatively rotatable; and a connecting port (4A) is provided on the installation cavity isolation portion (4) for conveying the exhaust gas of the first compression unit (21) to the second compression unit (22); The first compression unit (21) further comprises a first inner shell (213), a first partition wall (214) and an internal bearing seat (215); the first inner shell (213), the first partition wall (214) and the internal bearing seat (215) are fixed relative to the compressor outer shell (1); the internal bearing seat (215) and the mounting cavity partition portion (4) are respectively located at two axial ends of the first inner shell (213); the first male rotor (211) and the second female rotor (222) are located in a first rotor space (C111) surrounded by the internal bearing seat (215), the first inner shell (213) and the mounting cavity partition portion (4); the first inner shell (213) is provided with a first compression unit. a first compression unit air intake port (21A), a first compression unit air exhaust port (21B) being provided on the internal bearing seat (215), the first partition wall (214) being located between the compressor outer shell (1) and the first inner shell (213), and dividing a first installation cavity (C11) between the first inner shell (213), the internal bearing seat (215) and the compressor outer shell (1) into a first air intake chamber (C112) and a first air exhaust chamber (C113), the first air intake chamber (C112) being in communication with the compressor inlet (1A) and the first compression unit air intake port (21A), and the first air exhaust chamber (C113) being in communication with the first compression unit air exhaust port (21B) and the communication port (4A); The single body rotating shaft is supported on the internal bearing seat (215) and the compressor housing (1) via bearings.

2. The screw compressor according to claim 1, characterized in that: Along the axial direction of the monomer rotation axis, the intake ends of the first compression unit (21) and the second compression unit (22) are adjacent to each other, while the exhaust ends are far away from each other.

3. The screw compressor according to claim 1, characterized in that: The first compression unit (21) and the second compression unit (22) are connected in series.

4. The screw compressor according to claim 1, characterized in that: At least one of the spiral portion of the first male rotor (211) and the spiral portion of the second male rotor (221) is integrally formed with the single rotating shaft; or At least one of the spiral portion of the first male rotor (211) and the spiral portion of the second male rotor (221) is a sleeve spiral portion that is non-rotatably connected to the single body rotating shaft.

5. The screw compressor according to claim 4, characterized in that: The exhaust end of the sheathed spiral part and the single body rotating shaft are axially limited by a step surface to prevent the sheathed spiral part from moving toward the suction end of the sheathed spiral part, and the single body rotating shaft and the suction end of the sheathed spiral part are axially fixed by an axial positioning part.

6. The screw compressor according to claim 5, characterized in that: The axial positioning portion comprises: A stopper abuts against the end surface of the air suction end of the sleeve spiral portion and the step surface of the monomer rotating shaft located on the air suction end of the sleeve spiral portion; and A connecting member connects the stopper to the sleeve spiral portion and / or the single body rotating shaft.

7. The screw compressor according to claim 6, characterized in that: The single body rotating shaft and the installation cavity isolation portion (4) are sealed and connected in a relatively rotatable manner via a toothed sealing structure (4B).

8. The screw compressor according to claim 6, characterized in that: The first compression unit (21) is located between the driving portion (3) and the second compression unit (22).

9. The screw compressor according to claim 6, characterized in that: The second compression unit (22) further comprises a second inner shell (223) and a second partition wall (224) fixed relative to the compressor outer shell (1); the second inner shell (223) is arranged in the second installation cavity (C12); the second male rotor (221) and the second female rotor (222) are located in a second rotor space (C121) surrounded by the installation cavity isolation portion (4), the second inner shell (223) and the compressor outer shell (1); the second compression unit air inlet (22A) and the second compression unit air inlet (22A) are provided on the second inner shell (223); The second partition wall (224) is located between the compressor outer shell (1) and the second inner shell (223), and divides the second installation cavity (C12) between the second inner shell (223) and the compressor outer shell (1) into a second intake cavity (C122) and a second exhaust cavity (C123), wherein the second intake cavity (C122) is connected to the connecting port (4A) and the second compression unit air inlet (22A), and the second exhaust cavity (C123) is connected to the second compression unit exhaust port and the compressor outlet (1B).

10. The screw compressor according to any one of claims 1 to 9, characterized in that: The first female rotor (212) is supported on the internal bearing seat (215) and the installation cavity isolation portion (4) via a bearing; The second female rotor (222) is supported on the installation cavity isolation portion (4) and the compressor casing (1) via bearings.

11. The screw compressor according to any one of claims 1 to 9, characterized in that: The axis of the first female rotor (212), the axis of the second female rotor (222) and the axis of the single body rotating shaft are located in the same plane, and the axis of the first female rotor (212) and the axis of the second female rotor (222) are located on both sides of the axis of the single body rotating shaft.

12. The screw compressor according to any one of claims 1 to 9, characterized in that: The compressor housing (1) comprises four housing segments arranged in sequence along the axial direction of the single body rotating shaft, the four housing segments comprising: a first shell segment (11), wherein a first end of the first shell segment (11) is closed, and the driving unit (3) is installed in the first shell segment (11); a second shell segment (12), wherein a first end of the second shell segment (12) is connected to a second end of the first shell segment (11), the compressor inlet (1A) is arranged in the second shell segment (12), and the first compression unit (21) is installed in the second shell segment (12); a third shell segment (13), wherein a first end of the third shell segment (13) is connected to a second end of the second shell segment (12), and the second compression unit (22) is installed in the third shell segment (13); and A fourth shell segment (14), wherein the first end of the fourth shell segment (14) is connected to the second end of the third shell segment (13), the second end of the fourth shell segment (14) is closed, a bearing cavity for accommodating a bearing supporting the single body rotating shaft and a bearing cavity for accommodating a bearing supporting the second female rotor (222) are provided in the fourth shell segment (14), and the compressor outlet (1B) is located on the fourth shell segment (14).

13. The screw compressor according to claim 12, characterized in that: The first shell segment (11) is provided with a cooling channel (111) for the flow of a cooling fluid for cooling the drive unit (3).

14. An air conditioner, characterized in that: A screw compressor comprising the screw compressor according to any one of claims 1 to 13.

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