CN108167189A - Compressor and air conditioning unit - Google Patents

Abstract

The invention relates to a compressor and an air conditioning unit, wherein the compressor comprises a machine body and at least two stages of rotors arranged in the machine body, each stage of rotor comprises a male rotor (1, 1 ') and a female rotor (2, 2') which are matched with each other, and the female rotors (2, 2 ') in each stage of rotor are positioned on the same side of the male rotors (1, 1') in the radial direction. Because the arrangement modes of the rotors at all stages in the compressor are the same, the structure of the compressor body can be simplified, the layout of parts in the compressor body is optimized, and the two stages of rotors can adopt the same assembly process, so that the assembly efficiency of the compressor is improved.

Description

Compressors and air conditioning units

technical field

The invention relates to the technical field of compressors, in particular to a compressor and an air conditioner unit.

Background technique

Single-unit two-stage screw compressor, the two-stage rotors are respectively arranged on both sides of the motor, and the motor simultaneously drives the low-pressure stage male rotor and the high-pressure stage male rotor to move. The two-stage rotors run at the same time, and the direction of suction and exhaust is related to the arrangement of the rotors and the direction of rotation.

In the prior art, the compressor adopts a lower-mounted slide valve, the high-pressure stage female rotor and the low-pressure stage female rotor are arranged on both sides of the male rotor along the radial direction, and the suction port and the exhaust port are set on the upper part of the compressor. It is difficult to assemble the compressor, which affects the production efficiency of the compressor; and in actual use, it is found that the oil content in the exhaust gas of the compressor is relatively large, which is not conducive to the lubrication inside the compressor.

Contents of the invention

Embodiments of the present invention provide a compressor and an air conditioner unit, which can improve the production efficiency of the compressor.

In order to achieve the above object, the first aspect of the embodiment of the present invention provides a compressor, which includes a body and at least two stages of rotors arranged in the body, each stage of rotors includes a male rotor and a female rotor that cooperate with each other, and each stage The female rotors in the rotor are all located on the same side of the male rotor in the radial direction.

Further, the helical directions of the male rotors in the rotors of each stage are the same.

Further, an oil return circuit is provided in the compressor, and the female rotor in the rotors of each stage is located on a side away from the oil return circuit.

Further, the machine body is provided with a suction port and an exhaust port, the suction port is located in the upper area of the lowest-pressure rotor, and the exhaust port is located in the lower area of the highest-pressure rotor.

Further, the exhaust port is arranged on the side of the lower area of the rotor of the highest pressure stage.

Further, it also includes a driving part, the compressor is provided with two-stage rotors, and the driving part is located between the two-stage rotors;

The first output end of the driving component is directly connected to the male rotor on the corresponding side, and the second output end is connected to the male rotor on the corresponding side through a coupling.

Further, a liquid injection port is provided on the machine body between adjacent two-stage rotors, which is used to fill the body with liquid refrigerant.

Further, the liquid injection port is located on the upper part of the body.

Further, it also includes driving components, the compressor is provided with an oil return circuit, and the body is provided with an oil replenishment port, which is used to feed lubricating oil into the oil return circuit, and the oil return circuit is used to connect the oil replenishment port to The injected lubricating oil is guided to the driving parts and the positions of the rotors of each stage respectively.

Further, the oil return passage is configured so that lubricating oil enters from the sides of the male rotors of the rotors of each stage, and returns oil from the bottom of the male rotors of the rotors of each stage.

To achieve the above object, the second aspect of the embodiment of the present invention provides an air conditioner unit, including the compressor of the above embodiment.

Based on the above technical solution, in the compressor of an embodiment of the present invention, at least two stages of rotors are arranged in the body, and the female rotors of each stage of rotors are located on the same side of the male rotor in the radial direction. Since the arrangement of the rotors at all stages in this type of compressor is the same, it can not only simplify the structure of the body itself, optimize the layout of various parts in the body, but also the two-stage rotors can use the same assembly process, which can improve the assembly efficiency of the compressor. Thereby improving the production efficiency of the compressor.

Description of drawings

The accompanying drawings described here are used to provide a further understanding of the present invention and constitute a part of the application. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations to the present invention. In the attached picture:

Fig. 1 is a sectional view of an embodiment of the compressor of the present invention;

Fig. 2 is the front view of an embodiment of compressor of the present invention;

Fig. 3 is the airflow direction schematic diagram in the compressor of the present invention;

Fig. 4 is a schematic diagram of the oil circuit circulation in the compressor of the present invention.

Explanation of reference signs

1. Low pressure male rotor; 2. Low pressure female rotor; 1', high pressure male rotor; 2', high pressure male rotor; 3. Low pressure body; 4. Exhaust bearing seat; 5. Medium pressure body; 6. Motor; 7. Motor body; 8. High pressure body; 9. Exhaust stop valve; 10. Suction port; 11. Exhaust port; 12. Liquid injection port; 13. Oil filling port; 14. Coupling Device; 15, bearing; 16, wiring board components; 17, slide valve; 21, the first oil circuit; 22, the second oil circuit; 23, the third oil circuit.

Detailed ways

The present invention will be described in detail below. In the following paragraphs, different aspects of the embodiments are defined in more detail. Aspects so defined may be combined with any other aspect or aspects unless specifically stated otherwise. In particular, any feature considered to be preferred or advantageous may be combined with one or more other features which are considered to be preferred or advantageous.

Terms such as "first" and "second" appearing in the present invention are only for convenience of description, to distinguish different components with the same name, and do not indicate a sequence or a primary and secondary relationship.

In the description of the present invention, orientations or positional relationships indicated by "upper", "lower", "top", "bottom", "front", "rear", "inner" and "outer" are used based on the attached The orientation or positional relationship shown in the figure is only for the convenience of describing the present invention, and does not indicate or imply that the referred device must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as limiting the protection scope of the present invention .

As shown in Figures 1 to 4, the present invention provides a compressor, in a schematic embodiment, including a body and at least two stages of rotors, the body is provided with a suction port 10 and an exhaust port 11, from The low-temperature and low-pressure gaseous refrigerant introduced into the suction port 10 is converted into high-temperature and high-pressure gaseous refrigerant after at least two stages of rotor compression, and then discharged from the exhaust port 11 . At least two stages of rotors are arranged in the machine body, and are arranged sequentially along the length direction of the machine body from the suction port 10 to the exhaust port 11 .

Wherein, each stage of rotor includes a male rotor and a female rotor that cooperate with each other. Generally, the male rotor and the female rotor are in the same horizontal plane. For example, in a screw compressor, each rotor stage includes male and female screws that mesh with each other. Moreover, the female rotors in the rotors of each stage are all located on the same side of the male rotor in the radial direction. Seen from the axial end of one of the male rotors, the female rotors in the rotors of each stage can be located on the left side of the male rotor, or all can be located on the right side of the male rotor.

Taking the two-stage compressor shown in Figure 1 as an example, it includes two-stage rotors. Among them, the low-pressure stage rotor is set in the low-pressure stage body 3, including the low-pressure stage male rotor 1 and the low-pressure stage female rotor 2; the high-pressure stage rotor is located in the high-pressure stage. The stage body 8 includes a high-pressure stage male rotor 1' and a high-pressure stage female rotor 2'. On the downstream of the low-pressure stage body 3 and the high-pressure stage body 8 along the airflow direction, an exhaust bearing seat 4 is arranged, and a bearing 15 is arranged in the exhaust bearing seat 4 to provide support for the male rotor and the female rotor. Both the low-pressure stage female rotor 2 and the high-pressure stage female rotor 2' are located on the same radial side of the male rotor in the horizontal plane, and the body can be designed as a concave shape.

Since the arrangement of the rotors at all stages in this type of compressor is the same, it can not only simplify the structure of the body itself, reduce the difficulty of design, but also optimize the layout of various parts in the body, and the two-stage rotors can use the same assembly process, only need Adopting a set of tooling does not need to change the installation standard, which can reduce the difficulty of assembly and improve the assembly efficiency of the compressor.

In one embodiment, the helical directions of the male rotors in the rotors of each stage are the same, and correspondingly, the helical directions of the female rotors in the rotors of each stage are also the same. As shown in Figure 1, the helix directions of the low-pressure male rotor 1 and the high-pressure male rotor 1' are the same, and they both adopt a right-handed structure; left-handed structure. In this embodiment, since the directions of rotation of the male rotors are consistent, and the directions of rotation of the female rotors are also consistent, the processing difficulty of the rotors can be reduced, the production efficiency of the compressor can be improved, and the processing cost can be reduced.

In another embodiment, taking two-stage rotors as an example, the helical directions of the low-pressure stage male rotor 1 and the high-pressure stage male rotor 1' are opposite, and correspondingly, the low-pressure stage female rotor 2 and the high-pressure stage female rotor 2' The direction of the spiral is also opposite. Generally, the male rotor is used as the active rotor, and the low-pressure stage male rotor 1 and the high-pressure stage male rotor 1' can be driven to rotate synchronously by the driving parts arranged between them. The direction of the formed "herringbone" is opposite, and the force of the gas inside the compressor acting on the two-stage rotor is opposite, which can offset the axial force of the male rotor and improve the service life of the bearing 15 and the driving parts.

As shown in Figure 1 and Figure 4, there is an oil return circuit in the compressor, and an oil supply port 13 is provided on the body to guide the lubricating oil in the system from the oil supply port 13 to the compressor through the oil return circuit. Where lubrication is required. The oil return circuit is generally opened on the body, and accordingly the wall thickness of the body on this side needs to be increased, and the weight also increases accordingly. Considering that the oil return structure and some other support structures will shift the center of the compressor, preferably, the female rotor of each stage rotor is located on the side away from the oil return circuit, so that the low-pressure stage body 3 and the high-pressure stage body 8 are also Offset to the female rotor side. In this way, the body on both sides of the axis of the male rotor is relatively symmetrical in appearance, and the weight distribution of the compressor on both sides of the axis of the male rotor can be more balanced, and the center of gravity can be adjusted to a position close to the middle of the axis of the male rotor.

Alternatively, the female rotors in the rotors of each stage are arranged on the same side as the oil return passage. On the basis of Figure 1, if the setting form of the male rotor remains unchanged, the helical direction of the female rotor in the rotors of each stage needs to be changed.

Further, as shown in FIG. 2 and FIG. 3 , an air inlet 10 and an air outlet 11 are provided on the machine body. Since the current compressor generally sets the slide valve 17 below the low-pressure stage rotor, the suction port 10 is arranged on the upper region of the lowest-pressure stage rotor, and accordingly the lowest-pressure stage rotor exhausts from the lower region. As shown in Figure 1, for the case where the helical directions of the two-stage male rotors are the same or opposite, the two-stage rotors are air intake at the top and exhaust at the bottom. Therefore, in order to reduce the exhaust path and reduce gas energy loss, the exhaust port 11 is located in the lower area of the highest pressure stage rotor.

Alternatively, the exhaust port 11 may also be provided at the upper area of the highest pressure stage rotor or other positions, which requires further guiding the gas to the exhaust port 11 at the lower area of the highest pressure stage rotor.

Because the bottom of the machine body is easy to accumulate oil, which is not conducive to the flow of air flow, and the two-stage rotors in the compressor of the present invention are the way of air intake from the top and exhaust from the bottom, so that the air flow is mainly concentrated on the upper part, which can reduce the flow resistance and reduce the energy consumption. Consumption loss.

Preferably, as shown in FIG. 2 , the exhaust port 11 is provided on the side of the lower region of the highest pressure stage rotor. When the bottom exhaust is used, the mixture of gas and lubricating oil will first impact the inner wall of the bottom of the body, and the gravity and impact of the lubricating oil will be used to separate the oil and gas, and then the gas will be discharged from the exhaust port, which can avoid excessive oil content in the exhaust. big. The exhaust port 11 is connected with an exhaust pipe, and the exhaust pipe can be arranged horizontally. Preferably, an exhaust cut-off valve 9 is set in the exhaust pipe to only allow gas to flow out of the exhaust pipe, so as to prevent the gaseous or liquid refrigerant in the pipeline from backflowing through the exhaust pipe and impacting the compressor when the compressor suddenly stops.

As shown in FIG. 1 , the compressor of the present invention also includes a driving part. There are two-stage rotors in the compressor. The driving part is located between the two-stage rotors and is used to provide power for the two-stage rotors. For example, the driving part is a motor 6 . Generally, the male rotor in the compressor is used as the active rotor, the female rotor is used as the passive rotor, and the low-pressure stage male rotor 1 and the high-pressure stage male rotor 1' are powered by the same driving component.

Specifically, the first output end of the driving component is directly connected to the male rotor on the corresponding side, and the second output end is connected to the male rotor on the corresponding side through a coupling 14 . Due to the different forces produced by the medium-pressure chamber on the two-stage rotors, there will be unbalanced forces in the two-stage rotors. By setting the coupling 14, the forces on the output shaft of the motor 6 and the axial direction of the rotors can be balanced to improve compression. machine reliability and service life.

Preferably, the first output end of the driving component is directly connected to the male rotor 1' of the high-pressure stage, such as using a key connection, and the second output end of the driving component is connected to the male rotor 1 of the low-pressure stage through a coupling 14. During assembly, the position of the shaft coupling 14 can be finally assembled.

The rotors at all levels in the compressor of the present invention adopt the mode of upper intake and lower exhaust. Since the exhaust pressure is greater than the suction pressure, the force direction of the rotors at all levels is from the exhaust end to the suction end at this time, that is, Bottom up. The radial force on the rotor can be balanced by the bearing 15 and the coupling 14 .

As shown in Figure 1, the motor 6 is set in the motor body 7, and the compressor body is sequentially provided with a low-pressure stage body 3, an exhaust bearing seat 4, a medium-pressure stage body 5, a motor body 7 and a high-pressure stage from the low-pressure side to the high-pressure side. Body 8. The suction port 10 is located on the low-pressure stage body 3 , the exhaust port 11 is located on the high-pressure stage body 8 , and a wiring board part 16 can also be arranged on the high-pressure stage body 8 .

During the working process of the compressor, if the internal temperature of the compressor is too high, the volumetric efficiency will decrease, the power consumption will increase, and the viscosity of the lubricating oil will decrease, resulting in increased internal wear, thus affecting the service life of the compressor. For this reason, in the present invention, a liquid spray port 12 is provided on the body between the adjacent two-stage rotors, which is used to add liquid refrigerant into the body. The added liquid refrigerant can reduce the internal temperature of the compressor, improve the volumetric efficiency of the compressor, reduce power consumption, and improve the performance and reliability of the compressor.

Preferably, as shown in FIG. 2 , the liquid injection port 12 is located at the upper part of the body. Specifically, the liquid injection port 12 is arranged on the upper part of the motor body 7 .

Fig. 3 is a schematic diagram of the airflow direction in the compressor of the present invention, as shown by the arrow direction, after the low-temperature and low-pressure gas is introduced from the suction port 10, it enters from the upper part of the low-pressure stage rotor fitting part, and after one-stage compression, it flows from the low-pressure The lower part of the matching part of the first-stage rotor is discharged, and enters the medium-pressure stage body 5, and then enters the upper part of the high-pressure stage rotor from the gap between the motor 6 and the motor body 7, and after two-stage compression, from the high-pressure stage rotor. The lower part is discharged, and after the oil and gas are separated, the gas is discharged through the exhaust port 11.

When the gaseous refrigerant flows through the motor 6 from bottom to top, it will cool down the motor 6, cool the stator coil of the motor 6, and reduce the exhaust gas temperature. For low-temperature working conditions, the evaporation temperature is lower than -30°C, and it does not exceed 5°C after passing through the low-pressure stage, which can play a cooling role.

When the low-temperature liquid refrigerant is replenished from the liquid injection port 12, the liquid refrigerant will settle, and the motor 6 can be cooled during the settlement process, and it can be mixed with the exhaust gas after the first-stage compression. Located at the top, part of the refrigerant enters the high-pressure stage compression chamber from above, and the refrigerant at the bottom flows upward through the motor chamber to cool the stator coil of the motor 6 and further reduce the exhaust temperature.

As shown in Figure 4, the compressor of the present invention is provided with an oil return circuit, and the body is provided with an oil replenishment port 13 for feeding lubricating oil into the oil return circuit, and the oil return circuit is used to supply oil The lubricating oil fed into the port 13 is respectively guided to the driving parts, the rotors of all stages or the positions of the bearings. This embodiment can fully provide lubrication to each main part of the compressor that needs lubrication, so that the operation of each part of the compressor is more flexible when the compressor is working, and the noise generated during operation is reduced.

Preferably, the oil return passage is configured such that lubricating oil enters from the side of the male rotor of each stage of rotor and returns oil from the bottom of the male rotor of each stage of rotor. Since the volume of the bearing chamber of the male rotor is larger than that of the bearing chamber of the female rotor, when the oil level of the bearing chamber of the female rotor reaches the design value, the oil on the side of the female rotor will flow to the side of the male rotor before the bearing chamber of the male rotor reaches.

Preferably, the oil return circuit is arranged on the same side of the compressor, which facilitates the circulation of the oil circuit, reduces the resistance when the oil flows, reduces the difficulty of design, and is also conducive to the arrangement of the female rotors at all stages.

Specifically, as shown in FIG. 4 , the oil return circuit includes a first oil circuit 21 , a second oil circuit 22 and a third oil circuit 23 , and the oil supply port 13 is provided on the side of the motor body 7 . As shown in the direction of the arrow, the first oil passage 21 is used to guide the lubricating oil passed through the oil supply port 13 to the inside of the motor 6, and the second oil passage 22 is used to guide the lubricating oil passed through the oil supply port 13 to the low pressure stage At the rotor, the third oil passage 23 is used to guide the lubricating oil passed through the oil supply port 13 to the high-pressure stage rotor.

As shown in Figure 4, the schematic diagram of the oil circuit circulation, lubricating oil enters from the side of the low-pressure stage male rotor 1, returns oil from the bottom of the low-pressure stage male rotor 1, and at the same time, lubricating oil enters from the side of the low-pressure stage male rotor 1', from Oil is returned from the bottom of the low-pressure stage male rotor 1'. Reliable oil return is ensured by the oil supply through the differential pressure of the low-pressure stage and the high-pressure stage.

When the compressor adopts the rotor arrangement of the present invention, the suction port 10 is located at the top, and the exhaust port 11 is located at the bottom. Offset to the female rotor side, the medium pressure stage body 5 and the motor body 7 are symmetrically arranged, the exhaust stop valve 9 and the oil return oil circuit are located on one side of the male rotor, and the female rotor is located on the other side of the male rotor, which can balance the male rotor. Weight distribution on both sides of the rotor. The compressor of the present invention may be a stand-alone two-stage or multi-stage compressor.

In addition, the present invention also provides an air conditioner unit, including the compressor described in the above embodiment. Because the shape of the compressor is more regular, other components in the air-conditioning unit are easier to arrange; and the easier assembly of the compressor can also improve the production efficiency of the air-conditioning unit.

The compressor and the air conditioner unit provided by the present invention have been introduced in detail above. In this paper, specific examples are used to illustrate the principles and implementation modes of the present invention, and the descriptions of the above examples are only used to help understand the method and core idea of the present invention. It should be pointed out that for those skilled in the art, without departing from the principle of the present invention, some improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims (11)

1. a kind of compressor, which is characterized in that including body and at least two-stage rotor that is located in the body, in every grade of rotor Include the male rotor (1,1 ') and the female rotor (2,2 ') that cooperate, the female rotor (2,2 ') in the rotors at different levels is in radial direction On be respectively positioned on the homonymy of male rotor (1,1 ').

2. compressor according to claim 1, which is characterized in that the spiral of the male rotor (1,1 ') in the rotors at different levels Line direction is identical.

3. compressor according to claim 1, which is characterized in that oil return circuit is equipped in the compressor, it is at different levels described Female rotor (2,2 ') in rotor is located remotely from the side of the oil return circuit.

4. compressor according to claim 1, which is characterized in that the body is equipped with air entry (10) and exhaust outlet (11), the air entry (10) is located at the upper area of minimum rotor of arbitrarily downgrading, and the exhaust outlet (11) is located at ultor rotor Lower area.

5. compressor according to claim 4, which is characterized in that the exhaust outlet (11) is located at ultor rotor lower part The side in region.

6. compressor according to claim 1, which is characterized in that further include driving part (6), be equipped in the compressor Rotor described in two-stage, the driving part (6) is between rotor described in two-stage；

First output terminal of the driving part (6) and the male rotor (1,1 ') of respective side are directly connected to, second output terminal with it is right The male rotor (1,1 ') of side is answered to be connected by shaft coupling (14).

7. compressor according to claim 1, which is characterized in that the position on the body between adjacent two-stage rotor Mouth spray (12) is installed, for filling into liquid refrigerants into the body.

8. compressor according to claim 7, which is characterized in that the mouth spray (12) is positioned at the top of the body.

9. compressor according to claim 1, which is characterized in that further include driving part (6), be equipped in the compressor Oil return circuit, the body is equipped with repairing mouth (13), for being passed through lubricating oil, the oil return circuit into the oil return circuit Lubricating oil for the repairing mouth (13) to be passed through is separately directed to the driving part (6) and rotor position at different levels.

10. compressor according to claim 9, which is characterized in that the oil return circuit is configured as making lubricating oil from each Male rotor (1,1 ') side of the grade rotor enters, and from male rotor (1,1 ') bottom oil return of the rotors at different levels.

11. a kind of air-conditioner set, which is characterized in that including any compressor of claim 1~10.