CN217682320U - Centrifugal compressor, refrigerating system, air conditioner and refrigerating equipment - Google Patents

Abstract

The utility model belongs to the technical field of compressor system, specifically provide a centrifugal compressor, refrigerating system, air conditioner and refrigeration plant. The utility model discloses aim at solving current centrifugal compressor and be easy because of surging destroyed problem at the in-process of work. Therefore, the centrifugal compressor comprises a motor and a compression device, wherein the motor comprises a casing, a stator and a rotor, the casing is provided with a first through hole and a second through hole, and the first through hole and the second through hole are respectively used for communicating the inner side and the outer side of the casing; the compression device comprises a volute fixedly connected with the casing or integrally manufactured, an impeller arranged in the volute and in driving connection with the rotor, and a diffuser arranged in the volute; the volute is provided with a gas supply channel, the casing is also provided with a gas supply channel, and the inside of the casing, the gas supply channel and the diffuser are sequentially communicated. The utility model discloses can avoid or reduce centrifugal compressor's surge effectively.

Description

Centrifugal compressor, refrigerating system, air conditioner and refrigerating equipment

Technical Field

The utility model belongs to the technical field of compressor system, specifically provide a centrifugal compressor, refrigerating system, air conditioner and refrigeration plant.

Background

Centrifugal compressors are widely used in air conditioners, refrigerators and other electrical equipment because of their energy saving, high efficiency, stable operation and long life.

Centrifugal compressors generally comprise a volute, an impeller and a diffuser, which are arranged in the volute, and the operating principle of the centrifugal compressor is as follows: when the impeller rotates at a high speed, the gas rotates along with the impeller and is thrown into the diffuser under the action of centrifugal force, so that a vacuum area is formed at the impeller to attract the outside gas to enter the impeller. With the continuous rotation of the impeller, the gas is continuously sucked and thrown out, so that the continuous flow of the gas is realized.

More generally, when gas flows through an impeller of a centrifugal compressor, the impeller rotating at a high speed increases the flow velocity and pressure of the gas under the action of centrifugal force. That is, the centrifugal compressor first converts mechanical energy of the prime mover into static and kinetic energy of the gas by means of the impeller. Then, when the gas flows through the passage of the diffuser, the flow velocity of the gas molecules in the front is reduced along with the gradual increase of the cross section of the flow passage of the diffuser, and the gas molecules in the back continuously flow forwards, so that most of kinetic energy of the gas is converted into static pressure energy, and the function of pressurization is further achieved.

However, centrifugal compressors are often damaged by surge during operation. The reasons for the surge of the centrifugal compressor are: along with the continuous increase of pipe network resistance of the system where the centrifugal compressor is located, the flow inside the centrifugal compressor can also be gradually reduced, and further the mobility of gas in an impeller and a volute inside the centrifugal compressor is poor. When the flow rate is reduced to a certain value, the impeller cannot normally work the gas due to the deterioration of the flow of the gas at the impeller, and further the pressure at the outlet of the centrifugal compressor is smaller than the pressure of the pipe network, so that the gas flow oscillation occurs between the centrifugal compressor and the pipe network, the centrifugal compressor generates violent vibration, and the centrifugal compressor is extremely easy to be seriously damaged in a short time. This phenomenon is called surge.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to solve current centrifugal compressor and be easy because of surging destroyed problem at the in-process of work.

A further object of the present invention is to provide a refrigeration system, an air conditioner and a refrigeration apparatus for avoiding surge of a centrifugal compressor or reducing surge of a centrifugal compressor.

In order to achieve the above object, the present invention provides a centrifugal compressor in a first aspect, which includes a motor and a compression device, wherein the motor includes a casing, a stator and a rotor, the casing is provided with a first through hole and a second through hole, and the first through hole and the second through hole are respectively used for communicating the inner side and the outer side of the casing; the compression device comprises a volute fixedly connected with the casing or integrally manufactured, an impeller arranged in the volute and in driving connection with the rotor, and a diffuser arranged in the volute; be provided with the air feed passageway on the spiral case, still be provided with the tonifying qi passageway on the casing, the inside of casing the tonifying qi passageway the air feed passageway with the diffuser communicates in proper order.

Optionally, the centrifugal compressor further comprises a control valve for controlling the make-and-break of the air supply passage.

Optionally, a valve hole intersecting the air supply channel is formed in the casing, and the control valve is mounted in the valve hole; and/or the control valve is an electromagnetic proportional valve.

Optionally, one end of the air supply channel far away from the air supply channel is formed on the side wall of the second through hole.

Optionally, still be provided with the gas storage chamber on the casing, the gas storage chamber is established ties the tonifying qi passageway with between the air feed passageway to make the fluid that flows out the tonifying qi passageway via the gas storage chamber flows in the air feed passageway.

Optionally, the air reservoir is provided as an annular cavity.

Optionally, the gas supply channel comprises a plurality of annular channels and/or a plurality of arcuate channels.

The present invention provides, in a second aspect, a refrigeration system comprising a condenser, a pressure reducing member, an evaporator and the centrifugal compressor of any one of the first to fourth aspects, an outlet of the centrifugal compressor being fluidly connected to an inlet of the condenser, an outlet of the condenser being fluidly connected to an inlet of the pressure reducing member, an outlet of the pressure reducing member being fluidly connected to an inlet of the evaporator, an outlet of the evaporator being fluidly connected to an inlet of the centrifugal compressor; the first through hole is fluidly connected to an outlet of the condenser, and the second through hole is fluidly connected to an outlet of the pressure reducing member and an inlet of the evaporator, respectively.

The present invention provides, in a third aspect, an air conditioner including the refrigeration system of any one of the second aspects.

The present invention provides, in a fourth aspect, a refrigeration apparatus comprising the refrigeration system of any of the second aspects.

Based on the foregoing description, it can be understood by those skilled in the art that in the foregoing technical solution of the present invention, by providing the first through hole, the second through hole and the air supply channel on the casing of the motor, the air supply channel is provided on the volute, and the inside of the casing, the air supply channel and the diffuser are sequentially communicated, so that the centrifugal compressor can introduce the fluid (for example, refrigerant in the refrigeration system) in the pipe network (for example, the refrigeration system) into the casing through the first through hole to cool the motor when in use, and then the fluid in the casing enters the diffuser through the air supply channel and the air supply channel, so as to supplement enthalpy for the diffuser, thereby increasing the static pressure energy of the gas in the diffuser. Therefore, the utility model discloses can avoid or reduce centrifugal compressor's surge effectively.

Further, the centrifugal compressor can control whether the fluid in the casing enters the diffuser or not through the control valve by arranging the valve hole intersecting with the air supplementing channel on the casing and installing the control valve in the valve hole.

Further, through set up the gas storage chamber of establishing ties between tonifying qi passageway and gas supply channel on the casing to make the fluid that flows the tonifying qi passageway flow in gas supply channel via the gas storage chamber, make gas earlier cushion through the gas storage chamber before getting into the diffuser, thereby the velocity of flow is more stable when making gas get into the diffuser, stability when having promoted the diffuser tonifying qi.

Furthermore, in the refrigeration system, the first through hole is in fluid connection with the outlet of the condenser, and the second through hole is in fluid connection with the outlet of the pressure reduction component and the inlet of the evaporator respectively, so that the centrifugal compressor can utilize the refrigerant flowing out of the condenser to cool the motor firstly and then supplement air to the diffuser. Therefore, the utility model discloses not only reduced the temperature of motor among the centrifugal compressor effectively, guaranteed the work efficiency of motor, still avoided the centrifugal compressor to appear or reduced the surge simultaneously.

The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.

Drawings

In order to more clearly illustrate the technical solution of the present invention, some embodiments of the present invention will be described hereinafter with reference to the accompanying drawings. Those skilled in the art will appreciate that elements or portions of the same reference number are the same or similar in different figures; the drawings of the present invention are not necessarily drawn to scale relative to each other. In the drawings:

fig. 1 is a schematic diagram of a centrifugal compressor according to some embodiments of the present invention;

FIG. 2 isbase:Sub>A cross-sectional view of the centrifugal compressor of FIG. 1 taken along the direction A-A (example one);

FIG. 3 isbase:Sub>A cross-sectional view of the centrifugal compressor of FIG. 1 taken along the direction A-A (example two);

fig. 4 is a schematic diagram of the refrigeration system according to some embodiments of the present invention.

Detailed Description

It is to be understood by those skilled in the art that the embodiments described below are only a part of the embodiments of the present invention, and not all embodiments of the present invention, and the part of the embodiments are intended to explain the technical principle of the present invention and not to limit the scope of the present invention. Based on the embodiments provided by the present invention, all other embodiments obtained by a person skilled in the art without any inventive work should still fall within the scope of the present invention.

It should be noted that in the description of the present invention, the terms "center", "upper", "lower", "top", "bottom", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicating the directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Further, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Furthermore, it should be noted that in the description of the present invention, the terms "cold" and "heat" are two descriptions of the same physical state. That is, the higher the "cold" a certain object (e.g., evaporator, air, condenser, etc.) has, the lower the "heat" it has, and the lower the "cold" it has, the higher the "heat" it has. A certain target object can release heat while absorbing cold, and can absorb heat while releasing cold. Some object stores "cold" or "heat" in order to keep the object at its current temperature. "refrigeration" and "heat absorption" are two descriptions of the same physical phenomenon, i.e., a target (e.g., an evaporator) absorbs heat while it is refrigerating.

A centrifugal compressor according to some embodiments of the present invention will be described in detail with reference to fig. 1.

It should be noted that, for convenience of description and to enable those skilled in the art to quickly understand the technical solution of the present invention, only the technical features having a strong association degree (directly or indirectly) with the technical problems and/or technical concepts to be solved by the present invention will be described later, and the technical features having a weak association degree with the technical problems and/or technical concepts to be solved by the present invention will not be described again. Since the technical features with a weaker degree of association belong to the common general knowledge in the art, the disclosure of the present invention will not be insufficient even if the features with a weaker degree of association are not described.

As shown in fig. 1, in some embodiments of the present invention, a centrifugal compressor 100 includes a motor 110 and two compression devices 120. Furthermore, in other embodiments of the present invention, one skilled in the art can also make the centrifugal compressor 100 include only one compression device 120 or more than three compression devices 120 as required.

With continued reference to fig. 1, in some embodiments of the present invention, the electric machine 110 includes a housing 111, a stator 112, and a rotor 113. The casing 111 is provided with a first through hole 1111 and a second through hole 1112, and the first through hole 1111 and the second through hole 1112 are respectively used for communicating the inner side and the outer side of the casing 111. The stator 112 is fixedly connected to the housing 111, and the rotor 113 is rotatable with respect to the stator 112.

Preferably, the first through hole 1111 and the second through hole 1112 are respectively located at both sides of the stator 112 in the axial direction of the motor 110, so that the fluid (e.g., refrigerant, gas) flowing into the casing 111 from the first through hole 1111 and flowing out of the casing 111 from the second through hole 1112 flows through the stator 112 to cool the stator 112.

With continued reference to fig. 1, although not labeled, the motor 110 may further include a support bearing (roller bearing), a magnetic suspension bearing, a thrust bearing, etc. Since these structures within the motor 110 are conventional to the centrifugal compressor 100, they will not be described in detail herein.

With continued reference to fig. 1, the compression device 120 includes a volute 121 fixedly connected or integrally formed with the housing 111, an impeller 122 disposed within the volute 121 and drivingly connected to the rotor 113, and a diffuser 123 disposed within the volute 121. Wherein the impeller 122 is preferably fixedly connected coaxially with the rotor 113. The diffuser 123 is located outside the impeller 122 in the radial direction of the impeller 122.

Continuing to refer to fig. 1, in some embodiments of the present invention, the spiral casing 121 is provided with a gas supply passage 1211, the casing 111 is further provided with a gas supply passage 1113 and a gas storage chamber 1114, and the inside of the casing 111, the gas supply passage 1113, the gas storage chamber 1114, the gas supply passage 1211 and the diffuser 123 are sequentially connected. So that gas earlier cushions through gas storage chamber 1114 before getting into diffuser 123 to the velocity of flow is more stable when making gas get into diffuser 123, stability when having promoted diffuser 123 tonifying qi.

With continued reference to fig. 1, an end of the supplementary gas passage 1113 remote from the gas supply passage 1211 is formed on a side wall of the second through-hole 1112 so that the fluid entering the supplementary gas passage 1113 flows through the stator 112 to cool the stator 112.

Further, one skilled in the art may form the end of the air supply passage 1113 away from the air supply passage 1211 at any position on the casing 111, for example, at a position aligned with the first through hole 1111 in the axial direction of the casing 11, as needed.

With continued reference to fig. 1, the housing 111 is provided with a valve hole 1115 intersecting the gas supply passage 1113, and the valve hole 1115 is fitted with the control valve 130 therein. The control valve 130 is used for controlling the make-and-break of the air replenishing channel 1113. Preferably, the control valve 130 is an electromagnetic proportional valve, so that the device (e.g. air conditioner, refrigerator) applying the centrifugal compressor 100 of the present invention can control the action of the control valve 130 through its controller, thereby controlling the make-and-break of the air supplement channel 1113.

Preferably, air reservoir 1114 is an annular cavity and air supply passage 1211 is generally tapered.

Further, the gas supply passage 1211 may have any feasible structure. Such as circular, annular, square, annular, etc.

As an example one, as shown in fig. 2, the gas supply passage 1211 includes a plurality of annular passages 12111, and each of the annular passages 12111 is tapered.

As an example two, as shown in fig. 3, the air supply passage 1211 includes a plurality of arc-shaped passages 12112. Preferably, the plurality of arcuate channels 12112 are distributed in three layers in the radial direction of the volute 121, and all of the arcuate channels 12112 within each layer are equally spaced about the axis of the volute 121.

It should be noted that, when the centrifugal compressor 100 has only one compression device 120, the volute 121 of the one compression device 120 is provided with an air supply passage 1211, and the casing 111 is provided with an air supplement passage 1113 and an air storage chamber 1114 corresponding to the air supply passage 1211.

When the centrifugal compressor 100 has two compression devices 120 and the gas supply passage 1211 is provided on both the volutes 121 of the two compression devices 120, one gas supply passage 1113 and two gas storage chambers 1114 communicating with the one gas supply passage 1113 are provided on the casing 111, and the two gas storage chambers 1114 respectively correspond to the gas supply passage 1211 of one compression device 120. Alternatively, one skilled in the art may provide only one air reservoir 1114 on the housing 111, and the air supply channels 1211 of the two compressing devices 120 may be respectively communicated with the one air reservoir 1114. In this case, one control valve 130 can simultaneously control whether the air supply channels 1211 of the two compressing devices 120 receive the air supplement.

Furthermore, when the centrifugal compressor 100 has two compressing devices 120 and the air supply channels 1211 are provided on the volutes 121 of both the compressing devices 120, one air supply channel 1113 and one air storage chamber 1114 are respectively provided for each air supply channel 1211, one control valve 130 is respectively provided for each air supply channel 1113, so that each air supply channel 1211 is controlled by the individual control valve 130 whether to receive air supply.

The operation of the centrifugal compressor 100 of fig. 1 will now be described in detail with reference to fig. 4 in conjunction with the refrigeration system 1000.

As shown in fig. 4, in some embodiments of the present invention, the refrigeration system 1000 includes a centrifugal compressor 100, a check valve 200, a condenser 300, a filter 400, a pressure reducing member 500, an evaporator 600, and a motorized ball valve 700.

Wherein the two compression devices 120 of the centrifugal compressor 100 are connected in series such that the centrifugal compressor 100 has only one inlet and one outlet. It will be understood by those skilled in the art that the upstream one of the two compression devices 120 can provide a higher flow rate and pressure of the refrigerant to the downstream one of the two compression devices 120.

With continued reference to fig. 4, the outlet of the centrifugal compressor 100 is fluidly connected to the inlet of the condenser 300, the outlet of the condenser 300 is fluidly connected to the inlet of the pressure reducing member 500, the outlet of the pressure reducing member 500 is fluidly connected to the inlet of the evaporator 600, and the outlet of the evaporator 600 is fluidly connected to the inlet of the centrifugal compressor 100.

Further, a check valve 200 is connected in series between the outlet of the centrifugal compressor 100 and the inlet of the condenser 300 to prevent the refrigerant in the condenser 300 from flowing back to the outlet of the centrifugal compressor 100. The filter 400 is connected in series between the outlet of the condenser 300 and the inlet of the pressure-reducing means 500. An electrically operated ball valve 700 is connected in series between the outlet of the evaporator 600 and the inlet of the centrifugal compressor 100.

Preferably, the pressure reducing means 500 is an electronic expansion valve. Further, the pressure-decreasing member 500 may be provided as a capillary tube as needed by those skilled in the art.

With continued reference to FIG. 4, the first through hole 1111 is fluidly connected to the outlet of the condenser 300, and the second through hole 1112 is fluidly connected to the outlet of the pressure-reducing means 500 and the inlet of the evaporator 600, respectively.

During normal operation of the centrifugal compressor 100, the diffuser 123 does not require air make-up. At this time, the control valve 130 is closed to block the supplementary gas passage 1113, thereby preventing the refrigerant flowing out of the second through hole 1112 from flowing into the supply gas passage 1211.

When the rotation speed of the rotor 113 is low, so that the flow rate of the refrigerant in the diffuser 123 is low, that is, the flow rate of the refrigerant in the diffuser 123 is lower than a preset minimum flow rate, the diffuser 123 needs to supplement air. At this time, the control valve 130 is opened to open the make-up air passage 1113, so that the refrigerant flowing through the second through hole 1112 enters the diffuser 123 through the make-up air passage 1113, the air storage chamber 1114 and the air supply passage 1211.

Based on the foregoing description, as can be understood by those skilled in the art, by providing the first through hole 1111, the second through hole 1112 and the air supply channel 1113 on the casing 111 of the motor 110, providing the air supply channel 1211 on the volute 121, and sequentially communicating the interior of the casing 111, the air supply channel 1113, the air supply channel 1211 and the diffuser 123, the centrifugal compressor 100 can introduce the refrigerant in the refrigeration system 1000 into the casing 111 through the first through hole 1111 to cool the motor 110 when in use, and then make the fluid in the casing 111 enter the diffuser 123 through the air supply channel 1113 and the air supply channel 1211 to add enthalpy to the diffuser 123, thereby increasing the static pressure energy of the gas in the diffuser 123. Therefore, the present invention can effectively avoid or reduce surge of the centrifugal compressor 100.

Further, by providing the valve hole 1115 intersecting the gas supply passage 1113 in the casing 111 and installing the control valve 130 in the valve hole 1115, the centrifugal compressor 100 can control whether the fluid in the casing 111 enters the diffuser 123 through the control valve 130.

Further, the air storage cavity 1114 connected in series between the air supply channel 1113 and the air supply channel 1211 is arranged on the casing 111, and the fluid flowing out of the air supply channel 1113 flows into the air supply channel 1211 through the air storage cavity 1114, so that the gas is buffered by the air storage cavity 1114 before entering the diffuser 123, the flow speed of the gas is more stable when entering the diffuser 123, and the stability of the diffuser 123 in air supply is improved.

Still further, in the refrigeration system 1000, the first through hole 1111 is fluidly connected to the outlet of the condenser 300, and the second through hole 1112 is fluidly connected to the outlet of the pressure-reducing member 500 and the inlet of the evaporator 600, respectively, so that the centrifugal compressor 100 can cool the motor 110 first by the refrigerant flowing out of the condenser 300 and supplement air to the diffuser 123. Therefore, the utility model discloses not only reduced the temperature of motor 110 in the centrifugal compressor 100 effectively, guaranteed motor 110's work efficiency, still avoided the centrifugal compressor 100 to appear or reduced surge simultaneously.

Furthermore, although not shown in the drawings, the present invention also provides an air conditioner and a refrigeration device, which respectively comprise the refrigeration system 1000 described in any of the foregoing embodiments. The air conditioner can be a cabinet air conditioner, a wall-mounted air conditioner, a window air conditioner (half of each indoor unit and half of each outdoor unit), a central air conditioner or a one-driving-two air conditioner (one outdoor unit controls two indoor units simultaneously). The refrigeration appliance may be a refrigerator, freezer or freezer.

So far, the technical solution of the present invention has been described in connection with the foregoing embodiments, but it is easily understood by those skilled in the art that the scope of the present invention is not limited to these specific embodiments. Without deviating from the technical principle of the present invention, those skilled in the art can split and combine the technical solutions in the above embodiments, and also can make equivalent changes or substitutions for related technical features, and any changes, equivalent substitutions, improvements, etc. made within the technical concept and/or technical principle of the present invention will fall within the protection scope of the present invention.

Claims (10)

1. A centrifugal compressor is characterized by comprising a motor and a compression device,

the motor comprises a shell, a stator and a rotor, wherein a first through hole and a second through hole are formed in the shell, and the first through hole and the second through hole are respectively used for communicating the inner side and the outer side of the shell;

the compression device comprises a volute fixedly connected with the casing or integrally manufactured, an impeller arranged in the volute and in driving connection with the rotor, and a diffuser arranged in the volute;

be provided with the air feed passageway on the spiral case, still be provided with the tonifying qi passageway on the casing, the inside of casing the tonifying qi passageway the air feed passageway with the diffuser communicates in proper order.

2. The centrifugal compressor according to claim 1,

the centrifugal compressor also comprises a control valve, and the control valve is used for controlling the make-and-break of the air supplementing channel.

3. The centrifugal compressor of claim 2,

the shell is provided with a valve hole intersected with the air supplementing channel, and the control valve is installed in the valve hole; and/or the like and/or,

the control valve is an electromagnetic proportional valve.

4. The centrifugal compressor according to any one of claims 1 to 3,

one end of the air supply channel, which is far away from the air supply channel, is formed on the side wall of the second through hole.

5. The centrifugal compressor according to any one of claims 1 to 3,

the casing is also provided with a gas storage cavity which is connected in series between the gas supply channel and the gas supply channel, so that fluid flowing out of the gas supply channel flows into the gas supply channel through the gas storage cavity.

6. The centrifugal compressor of claim 5,

the air storage cavity is an annular cavity.

7. The centrifugal compressor according to any one of claims 1 to 3,

the gas supply channel comprises a plurality of annular channels and/or a plurality of arc-shaped channels.

8. A refrigeration system comprising a condenser, a pressure reducing member, an evaporator and the centrifugal compressor of any one of claims 1 to 7,

an outlet of the centrifugal compressor is fluidly connected to an inlet of the condenser, an outlet of the condenser is fluidly connected to an inlet of the pressure reducing member, an outlet of the pressure reducing member is fluidly connected to an inlet of the evaporator, and an outlet of the evaporator is fluidly connected to an inlet of the centrifugal compressor;

the first through hole is fluidly connected to an outlet of the condenser, and the second through hole is fluidly connected to an outlet of the pressure-reducing member and an inlet of the evaporator, respectively.

9. An air conditioner comprising the refrigeration system of claim 8.

10. A refrigeration apparatus comprising the refrigeration system of claim 8.

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