CN215762238U - Screw compressor and air conditioner - Google Patents

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 driving part installation space, a compressor inlet and a compressor outlet; the compression part is arranged in the compression part mounting space, is used for compressing gas at the inlet of the compressor and then outputting the compressed gas from the outlet of the compressor, and comprises a first compression unit and a second compression unit; the driving part is arranged in the mounting space of the driving part and comprises a motor rotor and a motor stator which is relatively fixed with the compressor shell and can be relatively rotatably sleeved on the periphery of the motor rotor; the motor rotor is fixedly sleeved on the rotating shaft of the first male rotor, and the rotating shaft of the second male rotor and the rotating shaft of the first male rotor are coaxially and integrally arranged to form a single rotating shaft. Axial stress of the two male rotors of the screw compressor can be directly and effectively balanced through the single rotating shaft, transmission loss can be effectively reduced, and energy efficiency and reliability of the screw compressor are improved.

Description

Screw compressor and air conditioner

Technical Field

The disclosure relates to the technical field of compressor equipment and air conditioning equipment, in particular to a screw compressor and an air conditioner.

Background

In the working process of the screw compressor, the main load of the screw compressor during operation is formed by the axial force generated by different suction and exhaust pressures at two axial ends of a compressor rotor and the radial force generated by the influence of the characteristics of the compressor rotor such as tooth form and structure.

In the related art, the stress of the compressor rotor is usually balanced by the bearing, but too much bearing causes excessive running loss, and the efficiency of the screw compressor is reduced.

The design of the single-machine 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 arranged, the two sets of compressor rotors are connected in series through a coupler, the two sets of compressor rotors are compressed by the first-stage compressor rotor and then compressed by the second-stage compressor rotor, the suction and exhaust pressure difference corresponding to the second-stage compressor rotors is reduced, and the axial force borne by the second-stage compressor rotor can be reduced. By means of opposite suction, the axial force is balanced at the coupling. However, because the coupler actually mainly bears torque, the stress of the compressor rotor cannot be completely balanced by the coupler, a plurality of groups of bearings need to be arranged, and the arrangement of the coupler enables the compressor to be divided into a plurality of compressor shell sections, so that the overall cost is high.

SUMMERY OF THE UTILITY MODEL

The purpose of the present disclosure is to provide a screw compressor and an air conditioner, which aim to solve the problem of axial force balance of the screw compressor comprising two compression units in the related art.

A first aspect of the present disclosure provides a screw compressor, including:

a compressor housing having a compression part installation space and a driving part installation space, and having a compressor inlet and a compressor outlet communicating with the compression part installation space;

the compression part is arranged in the compression part mounting space, is used for outputting the gas at the inlet of the compressor after being compressed from the outlet of the compressor, and comprises 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 includes a second male rotor and a second female rotor meshed with the second male rotor; and

the driving part is arranged in the driving part mounting space and comprises a motor rotor and a motor stator which is relatively fixed with the compressor shell and can be relatively rotatably sleeved on the periphery of the motor rotor;

the motor rotor is fixedly sleeved on the rotating shaft of the first male rotor, and the rotating shaft of the second male rotor and the rotating shaft of the first male rotor are coaxially and integrally arranged to form a single rotating shaft.

In the screw compressor of some embodiments, the first compression unit and the second compression unit have suction ends adjacent to each other and discharge ends distant from each other in the axial direction of the single rotary shaft.

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

In the screw compressor of some embodiments,

at least one of the helical portion of the first male rotor and the helical portion of the second male rotor is integrally formed with the single rotary shaft; or

At least one of the spiral part of the first male rotor and the spiral part of the second male rotor is a sleeved spiral part which is in rotation-stopping connection with the single rotating shaft.

In some embodiments, the single rotating shaft and the gas suction end of the sleeved spiral part are axially fixed by an axial positioning part through a stepped surface axial limit fit between the gas discharge end of the sleeved spiral part and the single rotating shaft to prevent the sleeved spiral part from moving towards the gas suction end of the sleeved spiral part.

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

the stop piece is attached to the end face of the air suction end of the sleeved spiral part and the step face of the single rotating shaft, which is positioned at the air suction end of the sleeved spiral part; and

a connector connecting the stopper to the nesting spiral and/or the single rotational shaft.

In the screw compressor of some embodiments, including installation cavity isolation portion, follow the axial of monomer axis of rotation, drive division installation space is located the one end of compression portion installation space, installation cavity isolation portion set up in first compression unit with between the second compression unit, will compression portion installation space separates for first installation cavity and second installation cavity, the monomer axis of rotation passes installation cavity isolation portion and with installation cavity isolation portion rotatable sealing connection relatively, be equipped with on the installation cavity isolation portion be used for with first compression unit's exhaust carry extremely the intercommunication mouth of second compression unit.

In some embodiments, the single rotating shaft and the installation cavity isolation portion are in relatively rotatable sealing connection through a tooth-shaped sealing structure.

In the screw compressor of some embodiments, the first compression unit is located between the driving part and the second compression unit.

In the screw compressor of some embodiments,

the first compression unit further comprises a first inner shell, a first partition wall and an inner bearing seat, the first inner shell, the first partition wall and the inner bearing seat are fixed relative to the compressor outer shell, the inner bearing seat and the mounting cavity isolation part are respectively positioned at two axial ends of the first inner shell, the first male rotor and the second female rotor are positioned in a first rotor space surrounded by the inner bearing seat, the first inner shell and the mounting cavity isolation part, a first compression unit air suction port is arranged on the first inner shell, a first compression unit air exhaust port is arranged on the inner bearing seat and/or the first inner shell, the first partition wall is positioned between the compressor outer shell and the first inner shell and divides the first mounting cavity between the first inner shell and the inner bearing seat as well as between the compressor outer shell into a first air suction cavity and a first air exhaust cavity, the first air suction cavity is communicated with the inlet of the compressor and the air suction port of the first compression unit, and the first exhaust cavity is communicated with the exhaust port of the first compression unit and the communication port; and/or

The second compression unit further comprises a second inner shell and a second partition wall, the second inner shell is fixed relative to the compressor outer shell, the second inner shell is arranged in the second installation cavity, the second male rotor and the second female rotor are located in a second rotor space defined 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 air outlet are formed in 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 air suction cavity and a second air exhaust cavity, the second air suction cavity is communicated with the communication port and the second compression unit air suction port, and the second air exhaust cavity is communicated with the second compression unit air outlet and the compressor outlet.

In the screw compressor of some embodiments,

the single rotating shaft is supported on the inner bearing seat and the compressor shell through bearings; and/or

The first female rotor is supported on the inner bearing seat and the mounting cavity partition through a bearing;

the second female rotor is supported on the mount chamber partition and the compressor housing by a bearing.

In the screw compressor of some embodiments, the axis of the first female rotor, the axis of the second female rotor, and the axis of the single rotary 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 rotary shaft.

In the screw compressor of some embodiments, the compressor housing includes four shell segments arranged in sequence along an axial direction of the unitary rotating shaft, the four shell segments including:

a first shell segment, a first end of which is closed, the driving portion being mounted within the first shell segment;

a second shell section, a first end of the second shell section being connected to a second end of the first shell section, the compressor inlet being disposed in the second shell section, the first compression unit being mounted in the second shell section;

a third shell section, a first end of the third shell section being connected to a second end of the second shell section, the second compression unit being mounted within the third shell section; and

and the first end of the fourth shell section is connected with the second end of the third shell section, the second end of the fourth shell section is closed, a bearing cavity for accommodating and supporting a bearing of the single rotating shaft and a bearing cavity for accommodating and supporting a bearing of the second female rotor are arranged in the fourth shell section, and the outlet of the compressor is positioned on the fourth shell section.

In the screw compressor of some embodiments, a cooling passage through which a cooling fluid for cooling the driving portion flows is provided on the first shell section.

The present disclosure provides an air conditioner including the screw compressor of the first aspect of the present disclosure.

Based on this disclosure provides a helical-lobe compressor, the form that sets up on the rotor shaft of the first male rotor of first compression unit is adopted to the second male rotor of the second compression unit of its compression portion, and the axis of rotation of first male rotor forms the structure of monomer axis of rotation with the axis of rotation of second male rotor, and the axial atress accessible monomer axis of rotation of two male rotors directly carries out effectual balance.

The motor rotor of the driving part is directly sleeved on the single rotating shaft of the compression part, the driving part and the compression part form direct driving, one shaft section of the rotating shaft of the first male rotor of the first compression unit is used as a driving shaft of the driving part, the rotating shaft of the first male rotor of the first compression unit and the rotating shaft of the second male rotor of the second compression unit are coaxially and integrally arranged, force transmission is not carried out through structures such as a coupler, transmission loss can be effectively reduced, and the energy efficiency and the reliability of the screw compressor are improved.

The arrangement of the single transmission shaft reduces the number of positioning sections of the rotating shafts of the male rotors of the driving part and the compression part, reduces risks caused by positioning deviation, reduces connecting parts between the rotating shafts and supporting parts of the rotating shafts, enables the structure of the screw compressor to be compact, and facilitates reduction of structural redundancy and cost of the compressor.

The air conditioner of the present disclosure includes the screw compressor of the present disclosure, having advantages that the screw compressor of the present disclosure has.

Other features of the present disclosure and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the disclosure and together with the description serve to explain the disclosure and not to limit the disclosure. In the drawings:

fig. 1 is a schematic cross-sectional view of one direction of a screw compressor according to an embodiment of the present disclosure.

Fig. 2 is a schematic cross-sectional view of the screw compressor of the embodiment shown in fig. 1 in another direction.

Fig. 3 is a schematic sectional view of the screw compressor of the embodiment shown in fig. 1 along the direction a-a.

FIG. 4 is a schematic sectional view of the screw compressor of the embodiment shown in FIG. 1 along the direction B-B.

Fig. 5 is a schematic cross-sectional structural view of a second male rotor of a second compression unit of a screw compressor according to an embodiment of the present disclosure.

Fig. 6 is a schematic structural view of a stopper of the second male rotor of the embodiment shown in fig. 5.

Detailed Description

The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are only a part of the embodiments of the present disclosure, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the disclosure, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.

The relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present disclosure unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

In the description of the present disclosure, it should be understood that the terms "first", "second", etc. are used to define the components, and are used only for convenience of distinguishing the corresponding components, and if not otherwise stated, the terms have no special meaning, and thus, should not be construed as limiting the scope of the present disclosure.

In the description of the present disclosure, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are presented only for the convenience of describing and simplifying the disclosure, and in the absence of a contrary indication, these directional terms are not intended to indicate and imply that the device or element being referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore, should not be taken as limiting the scope of the disclosure; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

Fig. 1 to 6 are schematic structural views of a screw compressor according to some embodiments of the present disclosure. As shown in fig. 1 to 6, the screw compressor of the embodiment of the present disclosure mainly includes a compressor housing 1, a compression portion 2, and a driving portion 3.

As shown in fig. 1 to 4, the compressor housing 1 has a compression part mounting space C1 and a driving part mounting space C2, and has a compressor inlet 1A and a compressor outlet 1B communicating with the compression part mounting space C1.

The compression unit 2 is provided in the compression unit installation space C1, and compresses the gas at the compressor inlet 1A and outputs the compressed gas from the compressor outlet 1B. The compression section 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 engaged with the first male rotor 211. The second compression unit 22 includes a second male rotor 221 and a second female rotor 222 engaged with the second male rotor 221.

The drive unit 3 is disposed in the drive unit installation space C2. The driving part 3 includes a motor rotor 31 and a motor stator 32 fixed relatively to the compressor housing 1 and rotatably fitted around the outer periphery of the motor rotor 31. The motor rotor 31 is fixedly fitted over the rotating shaft of the first male rotor 211. The rotational axis of the second male rotor 221 is coaxially and integrally provided with the rotational axis of the first male rotor 211 to form a single rotational axis.

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

The motor rotor 31 of the driving part 3 is directly sleeved on the single rotating shaft of the compression part 2, the driving part 3 and the compression part 2 form direct driving, one shaft section of the rotating shaft 2111 of the first male rotor 211 of the first compression unit 21 is used as a driving shaft of the driving part 3, the rotating shaft 2111 of the first male rotor 211 of the first compression unit 21 and the rotating shaft 2211 of the second male rotor 221 of the second compression unit 22 are coaxially and integrally arranged to form the single rotating shaft, and force transmission is not performed through structures such as a coupling, so that transmission loss can be effectively reduced, and energy efficiency and reliability of the screw compressor are improved.

The arrangement of the single transmission shaft reduces the number of positioning sections of the rotating shafts of the male rotors of the driving part and the compression part, reduces risks caused by positioning deviation, reduces connecting parts between the rotating shafts and supporting parts of the rotating shafts, has a compact structure, and is beneficial to reducing the structural redundancy of the compressor and the cost of the compressor.

As shown in fig. 1 to 4, in some embodiments, the suction ends of the first and second compression units 21 and 22 are adjacent and the discharge ends are distant from each other in the axial direction of the single rotary shaft. This arrangement facilitates axial forces generated by the first compression unit 21 and the second compression unit 22 during operation of the screw compressor to be directed from the discharge ends of the first compression unit 21 and the second compression unit 22 to the suction end, respectively, and finally borne by the single rotating shaft, facilitates reduction of the number and/or bearing capacity of the thrust bearings, facilitates compact structure of the screw compressor, and facilitates reduction of the cost of the screw compressor.

As shown in fig. 1 to 4, 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 in one stage, and the gas compressed in one stage is compressed in the second compression unit 22 in two stages.

In some embodiments, at least one of the helical portion of the first male rotor 211 and the helical portion of the second male rotor 221 is integrally formed with the unitary rotating shaft. Alternatively, at least one of the spiral part of the first male rotor 211 and the spiral part of the second male rotor 221 is a nested spiral part which is connected to the single rotating shaft in a rotation-stopped manner.

As shown in fig. 1 to 4, in some embodiments, the spiral portion 2112 of the first male rotor 211 is integrally formed with the rotational shaft 2111, i.e., the single rotational shaft, and the spiral portion 2212 of the second male rotor 221 is a nested spiral portion, which is connected to the rotational shaft 2211, i.e., the single rotational shaft in a rotation-stopping manner.

As shown in fig. 1 to 4, the driving part 3, the first male rotor 211 of the first compression unit 21 of the compression part 2, and the second male rotor 221 of the second compression unit 22 share a single rotational shaft. The helical portion 2112 of the first male rotor 211 is integrally manufactured with the single rotary shaft. The helical portion 2112 of the second male rotor 211 is a nested helical portion, and in the embodiment shown in fig. 1 to 4, the helical portion 2112 is fitted to the single rotary shaft by shrink fitting. Each of the first female rotor 212 and the second female rotor 222 is a one-piece rotor in which a rotating shaft and a helical portion are integrally formed.

In some embodiments, as shown in fig. 5, the exhaust end of the sleeved spiral portion and the single rotating shaft are axially and limitedly matched through a step surface to prevent the sleeved spiral portion from moving towards the air suction end of the sleeved spiral portion, and the single rotating shaft and the air suction end of the sleeved spiral portion are axially fixed through the axial positioning portion. This arrangement facilitates reducing the number and/or load carrying capacity of the thrust bearings.

As shown in fig. 5, in some embodiments, the axial positioning portion includes, for example, a stop and a connector. The stop piece is attached to the end face of the air suction end of the sleeved spiral part and the step face of the single rotating shaft, which is located at the air suction end of the sleeved spiral part. The connector connects the stop member to the nested helix and/or the single rotational shaft.

Fig. 5 and 6 illustrate an example of one manner of coupling the helical portion 2212 of the secondary male rotor 221 to the rotational axis 2211 of the secondary male rotor 221 in some embodiments. Wherein the axis of rotation 2211 of the secondary male rotor 221 and the axis of rotation 2111 of the primary male rotor 211 form a single axis of rotation. The spiral portion 2212 is a sleeved spiral portion and forms a tight fit with the rotating shaft 2211, a small gap or an interference fit is reserved between an inner hole of the spiral portion 2212 and the single rotating shaft, the spiral portion 2212 is sleeved on the rotating shaft 2211 in a cold assembly mode, a step limiting portion (see the S portion in fig. 5) is arranged at the spiral portion 2212 of the secondary male rotor 221 and the exhaust end of the rotating shaft 2211, and the spiral portion 2212 cannot move towards the suction end due to the arrangement of the step limiting portion after the spiral portion 2212 and the rotating shaft 2211 are assembled. An axial positioning portion is provided at the air suction end of the secondary male rotor 221. The axial positioning portion includes a pressing plate 2213 as a stopper and a screw 2214 as a connecting member. As shown in fig. 6, the pressing plate 2213 is formed by two symmetrical semicircular rings 22131 and 22132, each of which is provided with a mounting hole 2213A for passing a screw 2214. The pressing plate 2213 is embedded in the air suction end face of the second male rotor 22, the single rotating shaft has a step face to limit the axial positions of the pressing plate 2213 and the single rotating shaft, and the screw 2214 is fixed on the end face of the spiral portion 2212, so that the air suction end of the spiral portion 2212 can be limited, and the spiral portion 2212 of the second male rotor 22 is ensured not to move towards the air discharge end.

The pressing plate 2213 is arranged in two semicircular rings, which is not limited by the diameter of the single rotating shaft. The pressure plate can also be provided with more ring segments.

The engagement of the screw 2212 with the shaft 2211 in the embodiment of fig. 5-6 is only one possible locking means. In an embodiment not shown in the drawings, the screw portion of the second male rotor and the rotating shaft may be locked by a screw, a key, or the like, or may be formed as an integral two-stage male rotor, that is, the first male rotor and the second male rotor may be formed integrally and coaxially.

As shown in fig. 1-4, in some embodiments, the screw compressor includes a mounting cavity partition 4. Along the axial direction of the single rotary shaft, the drive portion mounting space C2 is located at one end of the compression portion mounting space C1, and the mounting chamber partition portion 4 is provided between the first compression unit 21 and the second compression unit 22, and partitions the compression portion mounting space C1 into a first mounting chamber C11 and a second mounting chamber C12. The single rotating shaft penetrates through the installation cavity isolation part 4 and is in sealing connection with the installation cavity isolation part 4 in a relatively rotating mode. The chamber partition 4 is provided with a communication port 4A for conveying the exhaust gas of the first compression unit 21 to the second compression unit 22.

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 in a prescribed flow path, which is suitable for the case where the first compression unit 21 and the second compression unit 22 are connected in series. The screw compressor of the embodiment of the disclosure is a single-machine two-stage screw compressor. Through the arrangement of the installation cavity isolation part 4 and the communication port 4A on the installation cavity isolation part, the fluid between the first compression unit 21 and the second compression unit 22 flows in the compressor shell, a medium-pressure fluid channel does not need to be arranged outside the screw compressor, and the structure of the screw compressor is compact.

As shown in fig. 1 to 4, in some embodiments, the single rotating shaft and the installation cavity isolation portion 4 are connected in a sealing manner through a tooth-shaped sealing structure 4B in a relatively rotatable manner.

Installation cavity isolation portion 4 can be monomer structure, also can divide into a plurality of functional component according to the function of installation cavity isolation portion 4, and each functional component assembles the formation complete installation cavity isolation portion.

As shown in fig. 1 to 4, in some embodiments, the first compression unit 21 is located between the driving part 3 and the second compression unit 22. This setting does benefit to the fluid transfer between first compression unit and the second compression unit, and the overall arrangement of compression portion and helical-lobe compressor is compact, does benefit to and reduces the bearing quantity.

As shown in fig. 1-4, in some embodiments, first compression unit 21 further includes a first inner shell 213, a first dividing wall 214, and an inner bearing housing 215. The first inner shell 213, the first partition wall 214 and the inner bearing housing 215 are fixed relative to the compressor housing 1. The inner bearing housing 215 and the mounting chamber partition 4 are located at both axial ends of the first inner housing 213, respectively. The first male rotor 211 and the second female rotor 222 are located in a first rotor space C111 surrounded by the inner bearing housing 215, the first inner casing 213, and the mounting chamber partition 4. The first inner casing 213 is provided with a first compression unit inlet port 21A. The inner bearing housing 215 and/or the first inner housing 213 are provided with a first compression unit exhaust port 21B. The first partition wall 214 is positioned between the compressor housing 1 and the first inner casing 213, and partitions the first inner casing 213 and the inner bearing housing 215 as well as the first mounting chamber C11 between the compressor housing 1 into a first suction chamber C112 and a first discharge chamber C113. The first suction chamber C112 communicates with the compressor inlet 1A and the first compression unit suction port 21A. The first discharge chamber C113 communicates with the first compression unit discharge port 21B and the communication port 4A.

As shown in fig. 1 to 4, in some embodiments, the second compression unit 22 further includes a second inner shell 223 and a second partition wall 224 fixed with respect to the compressor housing 1. The second inner case 223 is disposed in the second mounting 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 partition 4, the second inner casing 223, and the compressor outer casing 1. The second inner casing 223 is provided with a second compression unit intake port 22A and a second compression unit exhaust port. The second partition wall 224 is positioned between the compressor outer case 1 and the second inner case 223, and partitions the second mounting chamber C12 between the second inner case 223 and the compressor outer case 1 into a second suction chamber C122 and a second discharge chamber C123. The second suction chamber C122 communicates with the communication port 4A and the second compression unit intake port 22A. The second discharge chamber C123 communicates with the second compression unit discharge port and the compressor outlet 1B.

The first compression unit and/or the second compression unit are/is arranged into a structure with an inner shell and a partition wall, so that gas can flow in the screw compression part conveniently, a flow passage of the screw compressor is shortened, the flow loss of the gas is reduced, and the structure of the screw compressor is more compact.

As shown in fig. 2, in some embodiments, the axis of the first female rotor 212, the axis of the second female rotor 222, and the axis of the unitary 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 unitary rotating shaft. This setting does benefit to the radial force's of monomer axis of rotation balance, effectively promotes the motion reliability of two positive rotors of compression portion 2, also does benefit to the quantity and the bearing capacity that reduce radial bearing to do benefit to screw compressor compact structure, reduce the cost.

As shown in fig. 1 to 4, in some embodiments, the single rotating shaft is bearing-supported on the inner bearing housing 215 and the compressor housing 1; and/or the first female rotor 212 is bearing supported on the inner bearing housing 215 and the mounting chamber partition 4; the second female rotor 222 is supported by bearings on the mount chamber partition 4 and the compressor housing 1.

As shown in fig. 1-4, in some embodiments, the compressor casing 1 includes four casing sections, including a first casing section 11, a second casing section 12, a third casing section 13, and a fourth casing section 14, arranged in sequence along the axial direction of the single rotary shaft.

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

The four shell sections are sequentially connected, all main parts of the screw compressor are uniformly distributed in the compressor shell, no interval exists between the shell sections of the compressor, end plates used for sealing different shell sections between adjacent shell sections are not required to be arranged, and the length of a single rotating shaft of the compression part is short, so that the screw compressor is compact in structure and low in cost.

The radially inner spaces of the second shell segment 12 and the third shell segment 13 constitute a compression portion mounting space C1. The installation cavity partition 4 is disposed inside the compressor casing 1, located at a boundary between the second shell segment 12 and the third shell segment 13, and partitions a compression part installation space C1 into a first installation cavity C11 and a second installation cavity C12. Wherein the second shell section 12 defines a first mounting cavity C11 of a compressor mounting space C1, and the compressor inlet 1A is disposed on the second shell section 12. The third shell section 13 defines a second mounting cavity C12 of the compression section mounting space C1.

As shown in fig. 1 to 4, the inner bearing housing 215 is built inside the first mounting cavity C11. The inner housing 215 is provided with a bearing cavity for receiving a bearing for supporting the single rotary shaft and a bearing cavity for receiving a bearing for supporting the first male rotor. The inner bearing housing 215 includes a support body 2151 and a bearing cover 2152, bearing cavities of the inner bearing housing 215 are disposed on the support body 2151, and a bearing unit 2152 for enclosing the bearing cavities of the inner bearing housing 215.

As shown in fig. 1 to 4, the installation cavity isolation portion 4 includes a sealing sleeve sleeved on the single rotating shaft and having the aforementioned tooth-shaped sealing structure 4B, and a bearing plate sleeved outside the sealing sleeve, and the bearing plate is provided with a bearing cavity for installing a bearing for bearing the first female rotor 212 and a bearing for bearing the second female rotor 222, respectively.

As shown in fig. 1 to 4, the fourth shell section 14 is provided with a compressor outlet 1B and a bearing cavity for accommodating a bearing supporting the single rotary shaft and a bearing cavity for accommodating a bearing supporting the second female rotor. Fourth shell 14 includes a shell segment body 141 and a shell segment cover 142. The bearing cavities of the fourth shell section 14 are arranged in the shell section main body 141, and the shell section cover plate 142 is used for sealing the bearing cavities of the fourth shell section 14.

As shown in fig. 1 to 4, in the embodiment of the present disclosure, the bearings supporting each rotating shaft 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.

The first radial bearing 51 is provided on the inner bearing housing 215 for supporting a shaft section of a single body bearing between the driving part 3 and the first compression unit 21. A second radial bearing 52 and a first thrust bearing 53 are disposed within the bearing cavity of the fourth shell section 14 for supporting the discharge end of the second male rotor of the single rotary shaft, i.e., the right end in fig. 1 and 2.

A third radial bearing 54 is located on the bearing plate of the chamber partition 4 for supporting the suction end of the first female rotor 212. A fourth radial bearing 55 and a second thrust bearing 56 are provided on the inner bearing housing 215 for supporting the exhaust end of the first female rotor.

The fifth radial bearing 57 is provided on the bearing plate of the chamber partition 4 for supporting the suction end of the second female rotor 212. A sixth radial bearing 58 and a third thrust bearing 56 are disposed within respective bearing cavities of the fourth shell section 14 for supporting the discharge end of the second female rotor of the single rotary shaft, i.e., the right end in fig. 1 and 2.

As shown in fig. 1, in some embodiments, in order to prevent the drive portion 3 from operating at an excessive temperature, the first casing section 11 is provided with a cooling passage 111 through which a cooling fluid for cooling the drive portion 3 flows. The driving portion 3 is cooled by an independent liquid-jet cooling method, and the cooling liquid enters and exits the driving portion mounting space C2 through the cooling passage 111. In some embodiments, not shown, the cooling of the driving unit 3 may be achieved by other cooling structures such as air-intake cooling.

According to the above description, in the screw compressor of the embodiment of the present disclosure, the driving portion, the first male rotor and the second male rotor share the single rotating shaft, so as to form an integrated male rotor direct-drive structure, which can perform stress balance on the two male rotors of the compression portion, thereby facilitating reduction of deformation of the male rotors and ensuring reliable operation of the screw compressor. Meanwhile, as the male rotors are stressed in a balanced manner, thrust bearings do not need to be arranged at the air suction ends of the two male rotors, and the thrust bearings can be arranged at the air exhaust ends of the two-stage male rotors, so that the reduction of moving parts, the simplification of the structure of the compressor and the reduction of the cost are facilitated. The drive part of the screw compressor and the transmission parts of the two male rotors are reduced, so that the efficiency of the screw compressor is improved, and the reliability of the compressor is improved due to the reduction of the running parts of the compressor.

Through simulation check, under the same other conditions, after the male rotor structure of the embodiment of the disclosure is adopted, the overall deflection deformation of the two male rotors of the compressor can be reduced by 2-8 μm, the maximum deformation can be reduced by 0.01-0.07 mm, the stress can be reduced by 1-5 KN, and the performance of the screw compressor can be effectively improved.

The embodiment of the disclosure also provides an air conditioner, which comprises the screw compressor of the embodiment of the disclosure. The air conditioner has the corresponding advantages of the screw compressor of the embodiment of the disclosure.

Finally, it should be noted that: the above examples are intended only to illustrate the technical solutions of the present disclosure and not to limit them; although the present disclosure has been described in detail with reference to preferred embodiments, those of ordinary skill in the art will understand that: modifications to the embodiments of the disclosure or equivalent replacements of parts of the technical features may be made, which are all covered by the technical solution claimed by the disclosure.

Claims (15)

1. A screw compressor, comprising:

a compressor housing (1) having a compression section installation space (C1) and a drive section installation space (C2), and having a compressor inlet (1A) and a compressor outlet (1B) communicating with the compression section installation space (C1);

a compression part (2) disposed in the compression part installation space (C1) for compressing the gas of the compressor inlet (1A) and outputting the compressed gas from the compressor outlet (1B), and including a first compression unit (21) and a second compression unit (22), the first compression unit (21) including a first male rotor (211) and a first female rotor (212) engaged 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

the driving part (3) is arranged in the driving part mounting space (C2) and comprises a motor rotor (31) and a motor stator (32) which is relatively fixed with the compressor shell (1) and can be relatively rotatably sleeved on the periphery of the motor rotor (31);

the motor rotor (31) is fixedly sleeved on the rotating shaft of the first male rotor (211), and the rotating shaft of the second male rotor (221) and the rotating shaft of the first male rotor (211) are coaxially and integrally arranged to form a single rotating shaft.

2. Screw compressor according to claim 1, characterised in that the suction ends of the first compression unit (21) and the second compression unit (22) are adjacent and the discharge ends are distant from each other in the axial direction of the single rotary shaft.

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

4. Screw compressor according to claim 1,

at least one of the helical portion of the first male rotor (211) and the helical portion of the second male rotor (221) is integrally formed with the single rotational shaft; or

At least one of the spiral part of the first male rotor (211) and the spiral part of the second male rotor (221) is a sleeved spiral part which is in rotation-stopping connection with the single rotating shaft.

5. The screw compressor of claim 4, wherein the gas discharge end of the sleeved spiral part and the single rotating shaft are axially in limit fit through a stepped surface to prevent the sleeved spiral part from moving towards the gas suction end of the sleeved spiral part, and the single rotating shaft and the gas suction end of the sleeved spiral part are axially fixed through an axial positioning part.

6. The screw compressor of claim 5, wherein the axial positioning portion comprises:

the stop piece is attached to the end face of the air suction end of the sleeved spiral part and the step face of the single rotating shaft, which is positioned at the air suction end of the sleeved spiral part; and

a connector connecting the stopper to the nesting spiral and/or the single rotational shaft.

7. The screw compressor according to claim 1, comprising a mounting chamber partition (4), wherein the driving portion mounting space (C2) is located at one end of a compression portion mounting space (C1) along an axial direction of the single rotary shaft, the mounting chamber partition (4) is disposed between the first compression unit (21) and the second compression unit (22) to partition the compression portion mounting space (C1) into a first mounting chamber (C11) and a second mounting chamber (C12), the single rotary shaft passes through the mounting chamber partition (4) and is rotatably and hermetically connected to the mounting chamber partition (4), and a communication port (4A) for conveying exhaust gas of the first compression unit (21) to the second compression unit (22) is provided on the mounting chamber partition (4).

8. Screw compressor according to claim 7, characterised in that the single rotary shaft is in relatively rotatable sealing connection with the installation space partition (4) by means of a toothed sealing structure (4B).

9. -screw compressor according to claim 7, characterised in that the first compression unit (21) is located between the drive (3) and the second compression unit (22).

10. Screw compressor according to claim 7,

the first compression unit (21) further comprises a first inner shell (213), a first partition wall (214) and an inner bearing seat (215), the first inner shell (213), the first partition wall (214) and the inner bearing seat (215) are fixed relative to the compressor outer shell (1), the inner bearing seat (215) and the mounting cavity isolating part (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) enclosed by the inner bearing seat (215), the first inner shell (213) and the mounting cavity isolating part (4), a first compression unit air suction port (21A) is arranged on the first inner shell (213), and a first compression unit air discharge port (21B) is arranged on the inner bearing seat (215) and/or the first inner shell (213), the first partition wall (214) is located between the compressor housing (1) and the first inner housing (213), and partitions a first mounting cavity (C11) between the first inner housing (213) and the inner bearing housing (215) and the compressor housing (1) into a first suction cavity (C112) and a first discharge cavity (C113), the first suction cavity (C112) communicating with the compressor inlet (1A) and the first compression unit suction port (21A), the first discharge cavity (C113) communicating with the first compression unit discharge port (21B) and the communication port (4A); and/or

The second compression unit (22) further comprises a second inner shell (223) and a second partition wall (224) fixed relative to the compressor housing (1), the second inner shell (223) is disposed in the second mounting cavity (C12), the second male rotor (221) and the second female rotor (222) are located in a second rotor space (C121) enclosed by the mounting cavity partition (4), the second inner shell (223) and the compressor housing (1), a second compression unit air inlet (22A) and a second compression unit air outlet are disposed on the second inner shell (223), the second partition wall (224) is located between the compressor housing (1) and the second inner shell (223) and divides a second mounting cavity (C12) between the second inner shell (223) and the compressor housing (1) into a second air suction cavity (C122) and a second air outlet cavity (C123), the second suction chamber (C122) is in communication with the communication port (4A) and the second compression unit intake port (22A), and the second discharge chamber (C123) is in communication with the second compression unit discharge port and the compressor outlet (1B).

11. Screw compressor according to claim 10,

the single rotating shaft is supported on the inner bearing seat (215) and the compressor shell (1) through bearings; and/or

The first female rotor (212) is bearing supported on the inner bearing housing (215) and the mounting cavity partition (4);

the second female rotor (222) is supported by bearings on the installation space partition (4) and the compressor housing (1).

12. -screw compressor according to any one of the claims 1 to 11, characterised in that the axis of the first female rotor (212), the axis of the second female rotor (222) and the axis of the monobloc rotation shaft lie in the same plane, the axis of the first female rotor (212) and the axis of the second female rotor (222) lying on either side of the axis of the monobloc rotation shaft.

13. -screw compressor according to any one of the claims 1 to 11, characterised in that the compressor housing (1) comprises four shell segments arranged in sequence in the axial direction of the monobloc rotating shaft, comprising:

a first shell segment (11), a first end of the first shell segment (11) being closed, the drive portion (3) being mounted within the first shell segment (11);

a second shell section (12), a first end of the second shell section (12) being connected to a second end of the first shell section (11), the compressor inlet (1A) being arranged in the second shell section (12), the first compression unit (21) being mounted in the second shell section (12);

a third shell section (13), a first end of the third shell section (13) being connected to a second end of the second shell section (12), the second compression unit (22) being mounted within the third shell section (13); and

a fourth shell segment (14), a first end of the fourth shell segment (14) being connected to a second end of the third shell segment (13), a second end of the fourth shell segment (14) being closed, a bearing cavity for accommodating a bearing supporting the single rotating shaft and a bearing cavity for accommodating a bearing supporting the second female rotor (222) being provided in the fourth shell segment (14), the compressor outlet (1B) being located on the fourth shell segment (14).

14. -screw compressor according to claim 13, characterised in that the first shell section (11) is provided with cooling channels (111) for the flow of a cooling fluid for cooling the drive (3).

15. An air conditioner characterized by comprising the screw compressor of any one of claims 1 to 14.

Images