CN117948729A - Air suspension unit and refrigeration equipment - Google Patents

Abstract

The application relates to the technical field of refrigeration, and discloses an air suspension unit, which comprises: the circulating main loop is formed by connecting a gas suspension compressor, a condenser and an evaporator through refrigerant pipelines, wherein the gas suspension compressor comprises a first-stage compressor and a second-stage compressor; one end of the air supplementing system is communicated with a refrigerant pipeline between the condenser and the evaporator, and the other end of the air supplementing system is communicated with an air supplementing port of the air suspension compressor; the air supply system is communicated with the liquid taking port of the circulating main loop at one end and the air supply port of the air suspension compressor at the other end; and one end of the bypass pipeline is communicated with the exhaust port of the primary compressor, the other end of the bypass pipeline is communicated with the air suction port of the secondary compressor, and the bypass pipeline is provided with a first control valve. The application can avoid the surge phenomenon of the unit and is beneficial to improving the reliability of the compressor. And the air supply characteristic of the air suspension compressor is utilized to improve the surge condition, and the energy loss can be reduced. The application also discloses refrigeration equipment.

Description

Air suspension unit and refrigeration equipment

Technical Field

The application relates to the technical field of refrigeration, in particular to an air suspension unit and refrigeration equipment.

Background

At present, with the increasing development of large-scale air conditioning systems, centrifugal refrigerating units gradually develop, and the centrifugal refrigerating units have the advantages of large refrigerating capacity, high efficiency, compact structure, no abrasion, low maintenance cost and the like, and can realize comprehensive utilization of energy. However, when the refrigerating capacity of the unit is adjusted to be too small, namely, the unit runs under a small load, the unit cannot effectively save energy and even can not work normally. At this time, the unit can repeatedly generate severe unit surge phenomenon, the surge times are more, and the cold machine can be stopped due to self-protection. And this phenomenon may damage the compressor, reducing its reliability and service life.

In order to avoid the surge condition which may occur when the compressor is operated under a small load, the related technical solution mainly adopts a bypass technology, that is, when the compressor is operated under a small load, the gas of the discharge port of the compressor is led back to the suction port of the compressor. However, this results in energy waste and also limits the bypass capacity, since the size of the bypass pipe cannot be made infinitely large. The method is matched with a diffuser which is arranged at the downstream of the impeller and can change the width of the flow channel to jointly adjust or utilizes a guide vane adjusting device arranged at the upstream of the impeller to adjust the opening of the guide vane, and the method has a certain effect on the operation range of the lifting unit, but has the defects of complex structure, easy failure of moving parts and the like.

It should be noted that the information disclosed in the above background section is only for enhancing understanding of the background of the application and thus may include information that does not form the prior art that is already known to those of ordinary skill in the art.

Disclosure of Invention

The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview, and is intended to neither identify key/critical elements nor delineate the scope of such embodiments, but is intended as a prelude to the more detailed description that follows.

The embodiment of the disclosure provides a gas suspension unit and refrigeration equipment, which can avoid the surge phenomenon of the unit and are beneficial to improving the reliability of a gas suspension compressor.

In some embodiments, the gas levitation unit includes: the circulating main loop is formed by connecting a gas suspension compressor, a condenser and an evaporator through refrigerant pipelines, wherein the gas suspension compressor comprises a primary compressor and a secondary compressor; one end of the air supplementing system is communicated with a refrigerant pipeline between the condenser and the evaporator, and the other end of the air supplementing system is communicated with an air supplementing port of the air suspension compressor; the air supply system is communicated with the liquid taking port of the circulating main loop at one end and the air supply port of the air suspension compressor at the other end; and one end of the bypass pipeline is communicated with the exhaust port of the primary compressor, the other end of the bypass pipeline is communicated with the air suction port of the secondary compressor, and the bypass pipeline is provided with a first control valve.

Optionally, in some embodiments, the circulation main loop comprises: one end of the first exhaust pipeline is communicated with the bypass pipeline, the other end of the first exhaust pipeline is communicated with the condenser, and the first exhaust pipeline is provided with a second control valve; one end of the second exhaust pipeline is communicated with the exhaust port of the secondary compressor, the other end of the second exhaust pipeline is communicated with the condenser, and a third control valve is arranged on the second exhaust pipeline; one end of the main pipeline is communicated with the condenser, the other end of the main pipeline is communicated with the evaporator, and the main pipeline is provided with a first throttle valve; and one end of the air suction pipeline is communicated with the evaporator, and the other end of the air suction pipeline is communicated with the air suction port of the primary compressor.

Optionally, in some embodiments, the air make-up system comprises: one end of the first air supplementing pipeline is communicated with the main pipeline between the evaporator and the first throttle valve, the other end of the first air supplementing pipeline is communicated with an air supplementing port of the primary compressor, and a fourth control valve is arranged on the first air supplementing pipeline; the second air supplementing pipeline, one end of the second air supplementing pipeline is communicated with the main pipeline between the evaporator and the first throttle valve, the other end of the second air supplementing pipeline is communicated with the bypass pipeline, and the second air supplementing pipeline is provided with a fifth control valve.

Optionally, in some embodiments, the air supply system comprises: the refrigerant pump is communicated with a liquid taking port of the circulating main loop through a liquid taking pipeline; the air supply tank is communicated with the refrigerant pump through a liquid outlet pipeline and is communicated with an air supply port of the air suspension compressor through an air supply pipeline.

Optionally, in some embodiments, the air supply line comprises: one end of the first air supply pipeline is communicated with the air supply tank, the other end of the first air supply pipeline is communicated with an air supply port of the primary compressor, and the first air supply pipeline is provided with a second throttle valve; the second air supply pipeline, the one end of second air supply pipeline with first air supply pipeline is linked together, the other end with the air supply mouth of second grade compressor is linked together, the second air supply pipeline is provided with the third choke valve.

Optionally, in some embodiments, the access line comprises: one end of the first liquid taking pipeline is communicated with the evaporator, the other end of the first liquid taking pipeline is communicated with the refrigerant pump, and the first liquid taking pipeline is provided with a fourth throttle valve; and/or a second liquid taking pipeline, wherein one end of the second liquid taking pipeline is communicated with the condenser, the other end of the second liquid taking pipeline is communicated with the refrigerant pump, and a fifth throttle valve is arranged on the second liquid taking pipeline.

Optionally, in some embodiments, the first exhaust line and the second exhaust line join an exhaust common line, the other end of the exhaust common line being in communication with the condenser.

Optionally, in some embodiments, the air levitation unit further comprises: one end of the air supplementing balance pipeline is communicated with the exhaust common pipeline, the other end of the air supplementing balance pipeline is communicated with the air suction pipeline, and the air supplementing balance pipeline is provided with a sixth throttle valve; and/or, the air supply balance pipeline, one end of the air supply balance pipeline is communicated with the exhaust common pipeline, the other end of the air supply balance pipeline is communicated with the air supply tank, and the air supply balance pipeline is provided with a seventh throttle valve.

Optionally, in some embodiments, the air levitation unit further comprises: the liquid level meter comprises a first liquid level meter and a second liquid level meter, the first liquid level meter is arranged on the evaporator, and the second liquid level meter is arranged on the air supply tank; the pressure sensor comprises a first pressure sensor and a second pressure sensor, the first pressure sensor is arranged in the air supply tank, and the second pressure sensor is arranged in the condenser; the flowmeter comprises a first flowmeter and a second flowmeter, the first flowmeter is arranged on the air suction pipeline, and the second flowmeter is arranged on the exhaust common pipeline; the temperature sensor comprises a first temperature sensor, a second temperature sensor, a third temperature sensor, a fourth temperature sensor and a fifth temperature sensor, wherein the first temperature sensor is arranged on the air suction pipeline, the second temperature sensor is arranged on the first air exhaust pipeline, the third temperature sensor is arranged on the second air exhaust pipeline, the fourth temperature sensor is arranged on the evaporator, and the fifth temperature sensor is arranged on the condenser.

The air suspension unit and the refrigeration equipment provided by the embodiment of the disclosure can realize the following technical effects:

In the embodiment of the disclosure, the two-stage compressor is adopted, so that the compression ratio of the unit can be improved, and the refrigerating effect of the unit is improved. The bypass pipeline is used for communicating the two-stage compressors, and an adaptive air supply system and an adaptive air supplementing system are arranged for the two-stage compressors. And by utilizing the air supply characteristics of the air suspension compressor to improve the surge condition, the disclosed embodiments can further reduce the loss and waste of energy.

The foregoing general description and the following description are exemplary and explanatory only and are not restrictive of the application.

Drawings

One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements, and in which like reference numerals refer to similar elements, and in which:

FIG. 1 is a schematic diagram of an air levitation unit according to an embodiment of the present disclosure;

FIG. 2 is a schematic diagram of an air suspension compressor provided in an embodiment of the present disclosure;

FIG. 3 is a schematic diagram of another air levitation unit provided by an embodiment of the present disclosure;

FIG. 4 is a schematic diagram of another air levitation unit provided by an embodiment of the present disclosure;

FIG. 5 is a schematic diagram of another air levitation unit provided by an embodiment of the present disclosure;

Fig. 6 is a schematic structural diagram of another air suspension unit provided in an embodiment of the present disclosure.

Reference numerals:

100: a circulation main loop; 10: a gas suspension compressor; 11: a first stage compressor; 111: a primary impeller; 112: a first-order volute; 113: a front axial bearing; 12: a secondary compressor; 121: a secondary impeller; 122: a second-stage volute; 123: a rear axial bearing; 20: a condenser; 30: an evaporator; 110: a first exhaust line; 120: a second exhaust line; 130: a main pipeline; 140: an air suction line; 150: an exhaust gas common line; 200: an air supplementing system; 210: a first air supply line; 220: a second air supply line; 300: an air supply system; 40: a refrigerant pump; 50: a gas supply tank; 51: a heating device; 310: a liquid taking pipeline; 311: a first liquid taking pipeline; 312: a second liquid taking pipeline; 320: a liquid outlet pipeline; 330: an air supply line; 331: a first air supply line; 332: a second air supply line; 400: a bypass line; 500: an air supplementing balance pipeline; 600: a gas supply balance pipeline; 61: a first control valve; 62: a second control valve; 63: a third control valve; 64: a fourth control valve; 65: a fifth control valve; 71: a first throttle valve; 72: a second throttle valve; 73: a third throttle valve; 74: a fourth throttle valve; 75: a fifth throttle valve; 76: a sixth throttle valve; 77: a seventh throttle valve; 81: a first level gauge; 82: a second level gauge; 83: a first pressure sensor; 84: a second pressure sensor; 85: a first flowmeter; 86: a second flowmeter; 87: a first temperature sensor; 88: a second temperature sensor; 89: a third temperature sensor; 810: a fourth temperature sensor; 811: and a fifth temperature sensor.

Detailed Description

So that the manner in which the features and techniques of the disclosed embodiments can be understood in more detail, a more particular description of the embodiments of the disclosure, briefly summarized below, may be had by reference to the appended drawings, which are not intended to be limiting of the embodiments of the disclosure. In the following description of the technology, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, one or more embodiments may still be practiced without these details. In other instances, well-known structures and devices may be shown simplified in order to simplify the drawing.

The terms first, second and the like in the description and in the claims of the embodiments of the disclosure and in the above-described figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate in order to describe embodiments of the present disclosure. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion.

In the embodiments of the present disclosure, the terms "upper", "lower", "inner", "middle", "outer", "front", "rear", and the like indicate an azimuth or a positional relationship based on that shown in the drawings. These terms are used primarily to better describe embodiments of the present disclosure and embodiments thereof and are not intended to limit the indicated device, element, or component to a particular orientation or to be constructed and operated in a particular orientation. Also, some of the terms described above may be used to indicate other meanings in addition to orientation or positional relationships, for example, the term "upper" may also be used to indicate some sort of attachment or connection in some cases. The specific meaning of these terms in the embodiments of the present disclosure will be understood by those of ordinary skill in the art in view of the specific circumstances.

In addition, the terms "disposed," "connected," "secured" and "affixed" are to be construed broadly. For example, "connected" may be in a fixed connection, a removable connection, or a unitary construction; may be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements, or components. The specific meaning of the above terms in the embodiments of the present disclosure may be understood by those of ordinary skill in the art according to specific circumstances.

The term "plurality" means two or more, unless otherwise indicated.

In the embodiment of the present disclosure, the character "/" indicates that the front and rear objects are an or relationship. For example, A/B represents: a or B.

The term "and/or" is an associative relationship that describes an object, meaning that there may be three relationships. For example, a and/or B, represent: a or B, or, A and B.

It should be noted that, without conflict, the embodiments of the present disclosure and features of the embodiments may be combined with each other.

At present, with the increasing development of large-scale air conditioning systems, centrifugal refrigerating units gradually develop, and the centrifugal refrigerating units have the advantages of large refrigerating capacity, high efficiency, compact structure, no abrasion, low maintenance cost and the like, and can realize comprehensive utilization of energy. However, when the refrigerating capacity of the unit is adjusted to be too small, namely, the unit runs under a small load, the unit cannot effectively save energy and even can not work normally. At this time, the unit can repeatedly generate severe unit surge phenomenon, the surge times are more, and the cold machine can be stopped due to self-protection. And this phenomenon may damage the compressor, reducing its reliability and service life.

In order to avoid the surge condition which may occur when the compressor is operated under a small load, the related technical solution mainly adopts a bypass technology, that is, when the compressor is operated under a small load, the gas of the discharge port of the compressor is led back to the suction port of the compressor. However, this results in energy waste and also limits the bypass capacity, since the size of the bypass pipe cannot be made infinitely large. The method is matched with a diffuser which is arranged at the downstream of the impeller and can change the width of the flow channel to jointly adjust or utilizes a guide vane adjusting device arranged at the upstream of the impeller to adjust the opening of the guide vane, and the method has a certain effect on the operation range of the lifting unit, but has the defects of complex structure, easy failure of moving parts and the like.

Referring to fig. 1-6, an embodiment of the present disclosure provides an air levitation unit, including: a main circulation loop 100, an air make-up system 200, an air supply system 300 and a bypass line 400. The main circulation loop 100 is formed by connecting a gas suspension compressor 10, a condenser 20 and an evaporator 30 through refrigerant pipelines, wherein the gas suspension compressor 10 comprises a primary compressor 11 and a secondary compressor 12. One end of the air supplementing system 200 is communicated with a refrigerant pipeline between the condenser 20 and the evaporator 30, and the other end is communicated with an air supplementing port of the air suspension compressor 10. One end of the air supply system 300 is communicated with the liquid taking port of the circulation main circuit 100, and the other end is communicated with the air supply port of the air suspension compressor 10. One end of the bypass line 400 communicates with the discharge port of the primary compressor 11, the other end communicates with the suction port of the secondary compressor 12, and the bypass line 400 is provided with the first control valve 61.

By adopting the air suspension unit provided by the embodiment of the disclosure, the compression ratio of the unit can be improved by adopting the two-stage compressor, and the refrigerating effect of the unit is improved. The bypass pipeline 400 is used for communicating the two-stage compressors, and the air supply system 300 and the air supplementing system 200 which are matched with the two-stage compressors are arranged, so that the surge phenomenon of a unit can be avoided while the air is stably supplied to the air suspension bearing, and the reliability of the air suspension compressor 10 is improved. And by utilizing the air supply characteristics of the air suspension compressor 10 to improve surge conditions, the disclosed embodiments can further reduce energy loss waste.

The gas suspension compressor 10 is a compressor including a gas suspension bearing. Specifically, the compressor bearing of the current centrifugal unit mainly adopts an oil lubrication bearing, an electromagnetic bearing and an air suspension bearing. By adopting the oil lubrication bearing, an oil supply system is required to be added, and lubricating oil can also leak into the refrigerant to cause refrigerant pollution. Whereas electromagnetic bearings and air suspension bearings are oilless bearings, which have less frictional resistance with the rotor. However, the electromagnetic bearing needs a complex control system, and the electromagnetic bearing has poor shock resistance and needs an additional bearing protection system. Compared with an electromagnetic bearing, the air suspension bearing does not need an additional control system and has simpler structure. The air suspension bearing comprises a static pressure bearing and a dynamic pressure bearing, wherein the static pressure bearing needs an air supply system, and the air supply system consists of a refrigerant pump, an air supply tank, an electric heater and other parts. Liquid is taken from the evaporator or the condenser by a refrigerant pump, liquid refrigerant is introduced into a gas supply tank, and the gas is supplied to the hydrostatic bearing after being heated by an electric heater.

Alternatively, as shown in connection with FIG. 2, gas suspension compressor 10 includes a primary compressor 11 and a secondary compressor 12. The primary compressor 11 includes a primary impeller 111, a primary volute 112, and a forward axial bearing 113. The secondary compressor 12 includes a secondary impeller 121, a secondary volute 122, and a rear axial bearing 123. Thus, the air suspension compressor 10 in the embodiment of the present disclosure is a two-stage compression, and by adopting a double-cantilever structure, the two impellers are respectively arranged at different positions, so that the axial force can be well balanced during the operation process, which is beneficial to improving the reliability of the shafting.

Optionally, the circulation main loop 100 includes: a first exhaust line 110, a second exhaust line 120, a main line 130, and an intake line 140. One end of the first exhaust line 110 communicates with the bypass line 400, and the other end communicates with the condenser 20, and the first exhaust line 110 is provided with the second control valve 62. One end of the second discharge line 120 is connected to the discharge port of the secondary compressor 12, and the other end is connected to the condenser 20, and the second discharge line 120 is provided with a third control valve 63. One end of the main pipe 130 communicates with the condenser 20, the other end communicates with the evaporator 30, and the main pipe 130 is provided with a first throttle valve 71. One end of the suction line 140 communicates with the evaporator 30, and the other end communicates with the suction port of the primary compressor 11. In this way, the embodiment of the disclosure sets the corresponding exhaust pipelines for the primary compressor 11 and the secondary compressor 12 respectively, so that the exhaust pressure of the gas suspension compressor 10 can be reduced by adjusting the exhaust path, and the phenomenon that the gas refrigerant flows back to the compressor and then surging is caused due to the excessively high outlet pressure is avoided.

Alternatively, the open-close states of the first control valve 61, the second control valve 62, and the third control valve 63 may be controllably adjusted. In some embodiments, when the air levitation train is in a low load state, the possibility of surging is high, and only the second control valve 62 is opened to conduct the first exhaust line 110, and the first control valve 61 and the third control valve 63 are closed. At this time, only the primary compressor 11 is operated and the secondary compressor 12 is not operated, and thus, by reducing the compression ratio of the gas suspension compressor 10, the embodiment of the present disclosure can appropriately adjust the discharge pressure to reduce the possibility of surging of the gas suspension compressor 10, which is advantageous for improving the reliability of the gas suspension compressor 10. In other embodiments, when the air levitation train is in a non-low load state, where the possibility of surge is not high, the first control valve 61 and the third control valve 63 are opened to conduct the bypass line 400 and the second exhaust line 120, and the second control valve 62 is closed. At this time, the primary compressor 11 and the secondary compressor 12 are both operated normally, and the gaseous refrigerant discharged from the primary scroll 112 enters the suction port of the secondary impeller 121 through the bypass line 400 and is discharged through the second discharge line 120. Therefore, the refrigerating effect of the unit can be improved by utilizing multi-stage compression, and the power consumption can be saved on the premise of ensuring that the unit does not generate surge phenomenon. And the multistage compression is advantageous in reducing the exhaust temperature, and also can improve the reliability of the gas suspension compressor 10.

Optionally, the air make-up system 200 includes: a first supplemental gas line 210 and a second supplemental gas line 220. One end of the first air supplementing pipe 210 is communicated with the main pipe 130 between the evaporator 30 and the first throttle valve 71, and the other end is communicated with the air supplementing port of the primary compressor 11, and the first air supplementing pipe 210 is provided with the fourth control valve 64. One end of the second air supplementing line 220 is communicated with the main line 130 between the evaporator 30 and the first throttle valve 71, and the other end is communicated with the bypass line 400, and the second air supplementing line 220 is provided with the fifth control valve 65. Thus, the embodiment of the disclosure sets corresponding air supplementing pipelines for the primary compressor 11 and the secondary compressor 12 respectively, so that the inlet flow of the air suspension compressor 10 can be increased, and the phenomenon that the gas refrigerant flows backward and then surging is caused due to the excessively low inlet flow is avoided.

Alternatively, the open-close states of the fourth control valve 64 and the fifth control valve 65 may be controlled and adjusted. In some embodiments, when the gas suspension unit is in a low load condition, the likelihood of surging is high, and only the primary compressor 11 is operated, the secondary compressor 12 is not operated, and the gas suspension compressor 10 discharges gaseous refrigerant mainly through the first discharge line 110. Correspondingly, the fourth control valve 64 is opened to supply air to the forward axial bearing 113, ensuring that the gas suspension compressor 10 can stably operate. In other embodiments, when the air-levitation train is in a non-low load condition, the likelihood of surge is not high, and both the primary compressor 11 and the secondary compressor 12 are operating normally. Correspondingly, the fifth control valve 65 is opened to supply air to the rear axial bearing 113, ensuring stable operation of the gas suspension compressor 10.

Alternatively, the first and second air-supplementing lines 210 and 220 are merged into an air-supplementing common line, and the other end of the air-supplementing common line communicates with the main line 130 between the evaporator 30 and the first throttle valve 71. In this way, the embodiment of the disclosure may shunt part of the refrigerant in the main circulation loop 100 through the air-supplementing common pipeline, and supplement air to the primary compressor 11 and the secondary compressor 12 through the first air-supplementing pipeline 210 and the second air-supplementing pipeline 220, so as to avoid the surge phenomenon of the unit.

Optionally, the air suspension unit further comprises: a gas-liquid separator. The gas-liquid separator is arranged on the gas supplementing common pipeline. Thus, the embodiment of the present disclosure can avoid the liquid refrigerant from entering the compressor to generate the liquid impact phenomenon, which is beneficial to improving the reliability of the gas suspension compressor 10.

Optionally, the air supply system 300 includes: a refrigerant pump 40 and a gas supply tank 50. The refrigerant pump 40 communicates with the liquid intake of the circulation main circuit 100 through a liquid intake line 310. The gas supply tank 50 communicates with the refrigerant pump 40 through a liquid outlet pipe 320 and communicates with a gas supply port of the gas suspension compressor 10 through a gas supply pipe 330. In this way, the air supply system 300 is provided in the embodiment of the present disclosure, so that the refrigerant in the main circulation loop 100 can be pumped to the air supply tank 50 by the refrigerant pump 40, and stably supply air to the air suspension compressor 10 via the air supply pipeline 330, so that the stable operation of the air suspension unit can be ensured.

Optionally, a heating device 51 is provided within the air supply tank 50. The heating device 51 is configured to heat the liquid refrigerant in the gas supply tank 50. In this way, by controlling the operation of the heating device 51, the liquid refrigerant in the gas supply tank 50 can be converted into a gaseous refrigerant, and the gas supply operation of the gas suspension compressor 10 can be realized.

Alternatively, the operating state of the refrigerant pump 40 may be controlled. In some embodiments, when the liquid refrigerant in the gas supply tank 50 is insufficient, the refrigerant pump 40 is turned on to control the liquid outlet pipe 320 to be conducted. The refrigerant pump 40 can be utilized to take liquid from the condenser 20 or the evaporator 30, so that the refrigerant can be timely supplemented for the air supply tank 50, and the stable operation of air supply operation is ensured. In other embodiments, when the liquid refrigerant is sufficient, the refrigerant pump 40 is turned off to terminate the liquid replenishing operation of the gas supply tank 50. Thus, the air supply tank 50 can always hold a sufficient liquid refrigerant to satisfy the operating conditions of the heating device 51. So that the air can be timely supplied to the air suspension compressor 10, and the air supply characteristic of the air suspension compressor 10 is utilized to improve the surge condition.

Alternatively, the operating state of the heating device 51 may be controlled. In some embodiments, when the pressure inside the gas supply tank 50 is low, the heating device 51 is activated to convert the liquid refrigerant in the gas supply tank 50 into a gaseous refrigerant. In other embodiments, when the pressure in the gas supply tank 50 is high, the heating device 51 is turned off to stop heating the liquid refrigerant in the gas supply tank 50. Thereby, it is possible to ensure stable operation of the gas supply operation to the gas suspension compressor 10.

Optionally, the air supply line 330 includes: a first air supply line 331 and a second air supply line 332. One end of the first air supply line 331 is connected to the air supply tank 50, and the other end is connected to the air supply port of the primary compressor 11, and the first air supply line 331 is provided with the second throttle valve 72. One end of the second air supply line 332 is connected to the first air supply line 331, and the other end is connected to the air supply port of the secondary compressor 12, and the second air supply line 332 is provided with a third throttle valve 73. Thus, the embodiments of the present disclosure set up the corresponding air supply lines 330 for the primary compressor 11 and the secondary compressor 12, respectively, and by adjusting the air supply amounts and air supply pressures on the first air supply line 331 and the second air supply line 332, the embodiments of the present disclosure can also adjust the balancing capability of the axial bearing, which is beneficial to improving the reliability of the shafting.

Alternatively, the opening degrees of the second throttle valve 72 and the third throttle valve 73 may be controlled and adjusted. In some embodiments, when the primary compressor 11 and the secondary compressor 12 are both operating normally, the aero-suspension compressor shafting is balanced, and by maintaining the second throttle valve and the third throttle valve operating at normal opening, the disclosed embodiments can stably supply air to the aero-suspension bearing. In other embodiments, when the primary compressor 11 is operating normally and the secondary compressor 12 is not operating, the shafting will be displaced to the primary impeller 111 side due to the influence of the pressure difference on both sides. By increasing the opening of the second throttle valve 72 and decreasing the opening of the third throttle valve 73, embodiments of the present disclosure are able to increase the supply air amount and supply air pressure to the front axial bearing 113, thereby being able to balance the axial force to reduce the likelihood of surging the gas suspension compressor 10, which is beneficial to improving the reliability of the gas suspension compressor.

Optionally, the liquid taking line 310 includes: first liquid taking pipe 311. One end of the first liquid taking pipe 311 is communicated with the evaporator 30, the other end is communicated with the refrigerant pump 40, and the first liquid taking pipe 311 is provided with a fourth throttle valve 74. Thus, the embodiment of the present disclosure can take liquid from the evaporator 30 through the first liquid taking pipe 311, so as to ensure that sufficient refrigerant is always stored in the gas supply tank 50, which is beneficial to gas supply for the gas suspension compressor 10.

Optionally, the liquid taking line 310 includes: a second liquid take-off line 312. One end of the second liquid-taking pipeline 312 is communicated with the condenser 20, the other end is communicated with the refrigerant pump 40, and the second liquid-taking pipeline 312 is provided with a fifth throttle valve 75. In this way, the embodiment of the present disclosure can take liquid from the condenser 20 through the second liquid taking pipe 312, so as to ensure that sufficient refrigerant is always stored in the gas supply tank 50, which is beneficial to gas supply for the gas suspension compressor 10.

Optionally, the liquid taking line 310 includes: a first liquid taking pipe 311 and a second liquid taking pipe 312. One end of the first liquid taking pipe 311 is communicated with the evaporator 30, the other end is communicated with the refrigerant pump 40, and the first liquid taking pipe 311 is provided with a fourth throttle valve 74. One end of the second liquid-taking pipeline 312 is communicated with the condenser 20, the other end is communicated with the refrigerant pump 40, and the second liquid-taking pipeline 312 is provided with a fifth throttle valve 75. In this way, the embodiment of the disclosure can take liquid from the evaporator 30 and the condenser 20 through the first liquid taking pipeline 311 and the second liquid taking pipeline 312 respectively, so as to ensure that sufficient refrigerant is always stored in the air supply tank 50, which is beneficial to air supply for the air suspension compressor 10. Meanwhile, by distributing the refrigerant flow on the first liquid taking pipeline 311 and the second liquid taking pipeline 312, the embodiment of the disclosure can also avoid the load brought by unilateral liquid taking to the evaporator 30 or the condenser 20, and further can reduce the negative influence on the working performance of the unit.

Alternatively, the opening degrees of the fourth throttle valve 74 and the fifth throttle valve 75 may be controlled and adjusted. In some embodiments, when the liquid refrigerant in the evaporator 30 is more, the fourth throttle valve 74 is opened to conduct the first liquid-taking pipe 311 to take liquid from the evaporator 30 to the air supply tank 50. The influence on the refrigerating performance of the unit is small under the working condition, the liquid refrigerant in the unit can be better utilized, the utilization rate of the system refrigerant can be improved while the unit keeps the better refrigerating performance, and the energy saving is facilitated. In other embodiments, when the liquid refrigerant in the evaporator 30 is less, the fifth throttle valve 75 is opened to conduct the second liquid-taking pipe 312 to take liquid from the condenser 20 to the air supply tank 50. Therefore, the embodiment of the disclosure can reduce the influence on the refrigerating performance of the unit. And the liquid taking path can reduce the pressure fluctuation of the unit, thereby being beneficial to guaranteeing the reliability of the unit during operation.

Alternatively, the first exhaust line 110 and the second exhaust line 120 join in an exhaust common line 150, and the other end of the exhaust common line 150 communicates with the condenser 20. Thus, the embodiment of the present disclosure can integrate the gaseous refrigerants discharged from the primary compressor 11 and the secondary compressor 12 to flow into the condenser 20 together, and is also beneficial to the subsequent distribution of the refrigerants.

Optionally, as shown in connection with fig. 3, the air suspension unit further comprises: the air supply balance pipeline 500. One end of the air-supplementing balance pipe 500 is communicated with the exhaust common pipe 150, the other end is communicated with the air suction pipe 140, and the air-supplementing balance pipe 500 is provided with a sixth throttle valve 76. As such, embodiments of the present disclosure direct the gaseous refrigerant discharged through the discharge line back to the compressor suction line 140, thereby enabling an increase in inlet flow to disengage the operating point of the gas suspension compressor 10 from the surge region. Although this results in a waste of energy, its anti-surge effect is better.

Alternatively, the open-closed state of the sixth throttle valve 76 may be controlled. In some embodiments, by opening the sixth throttle valve 76 to open the charge balance line 500, a portion of the gaseous refrigerant exiting the discharge line can be directed back to the suction line 140, thereby enabling an increase in inlet flow to disengage the operating point of the gas suspension compressor 10 from the surge region. Although the anti-surge effect is better, the energy loss is larger.

Optionally, as shown in connection with fig. 4, the air suspension unit further includes: and a gas supply balance line 600. One end of the air supply balance pipe 600 communicates with the exhaust gas common pipe 150, and the other end communicates with the air supply tank 50, and the air supply balance pipe 600 is provided with a seventh throttle valve 77. Thus, the embodiment of the disclosure can prevent the unit from surging while stably supplying air to the air suspension bearing. And by utilizing the air supply characteristics of the air suspension compressor 10 to improve surge conditions, embodiments of the present disclosure also reduce energy loss and waste.

Optionally, the open/close state of the seventh throttle valve 77 is controllably adjustable. In some embodiments, when the air suspension unit is in a medium load state, a certain surge possibility exists at this time, and by opening the seventh throttle valve 77 to conduct the air supply balance pipe 600, the air supply characteristic of the air suspension compressor 10 can be utilized to reduce the surge possibility, and meanwhile, the loss and waste of energy can be reduced. In other embodiments, when the air suspension unit is in a high load state, the possibility of surging is very low, so that the seventh throttle valve 77 does not need to be opened to conduct the air supply balance pipeline 600, and therefore the refrigerant of the main circulation loop 100 is not split.

Optionally, as shown in connection with fig. 5, the air suspension unit further includes: a make-up balance line 500 and a supply balance line 600. One end of the air-supplementing balance pipe 500 is communicated with the exhaust common pipe 150, the other end is communicated with the air suction pipe 140, and the air-supplementing balance pipe 500 is provided with a sixth throttle valve 76. One end of the air supply balance pipe 600 is communicated with the air supply balance pipe 500, the other end is communicated with the air supply tank 50, and the air supply balance pipe 600 is provided with a seventh throttle valve 77. Thus, by distributing the refrigerant flows on the air-make-up balance pipeline 500 and the air-supply balance pipeline 600, the disclosed embodiments can reasonably reduce energy loss and waste on the premise of ensuring that the unit does not generate surge phenomenon.

Alternatively, the open-close states of the sixth throttle valve 76 and the seventh throttle valve 77 may be controlled and adjusted. In some embodiments, the anti-surge effect of the unit can be enhanced by opening the sixth and seventh throttles 76, 77 to open the make-up balance line 500 and the supply balance line 600. However, since the refrigerant in the main circulation loop 100 is diverted by the air-compensating balance line 500 and the air-supplying balance line 600 to improve the surge condition of the unit, the embodiments of the present disclosure have large fluctuation of the refrigerating effect and large energy loss.

Alternatively, the first control valve 61, the second control valve 62, the third control valve 63, the fourth control valve 64, and the fifth control valve 65 are solenoid valves. Thus, by controlling the opening and closing of each electromagnetic valve, the embodiment of the disclosure can control the connection or disconnection of the corresponding pipeline so as to complete the adjustment of the operation scheme of the air suspension unit.

Optionally, the first throttle valve 71, the second throttle valve 72, the third throttle valve 73, the fourth throttle valve 74, the fifth throttle valve 75, the sixth throttle valve 76, and the seventh throttle valve 77 are electronic expansion valves. Therefore, through controlling the opening degree of each electronic expansion valve, the embodiment of the disclosure can accurately control the flow rate on the corresponding pipeline so as to complete the adjustment of the operation parameters of the air suspension unit.

Optionally, as shown in connection with fig. 6, the air suspension unit further includes: level gauge, pressure sensor, flowmeter and temperature sensor. The liquid level gauge includes a first liquid level gauge 81 and a second liquid level gauge 82, the first liquid level gauge 81 is provided at the evaporator 30, and the second liquid level gauge 82 is provided at the gas supply tank 50. The pressure sensor includes a first pressure sensor 83 and a second pressure sensor 84, the first pressure sensor 83 is provided to the air supply tank 50, and the second pressure sensor 84 is provided to the condenser 20. The flow meter includes a first flow meter 85 and a second flow meter 86, the first flow meter 85 is disposed in the intake pipe 140, and the second flow meter 86 is disposed in the exhaust common pipe 150. The temperature sensors include a first temperature sensor 87, a second temperature sensor 88, a third temperature sensor 89, a fourth temperature sensor 810, and a fifth temperature sensor 811, the first temperature sensor 87 is disposed in the intake pipe 140, the second temperature sensor 88 is disposed in the first exhaust pipe 110, the third temperature sensor 89 is disposed in the second exhaust pipe 120, the fourth temperature sensor 810 is disposed in the evaporator 30, and the fifth temperature sensor 811 is disposed in the condenser 20. Thus, through detecting relevant parameters, the embodiment of the disclosure can reasonably adjust the operation scheme of the air suspension unit by combining with the actual working condition. Thereby avoiding the surge phenomenon of the unit and being beneficial to improving the reliability of the gas suspension compressor 10.

The embodiment of the disclosure provides refrigeration equipment, which comprises the air suspension unit.

The above description and the drawings illustrate embodiments of the disclosure sufficiently to enable those skilled in the art to practice them. Other embodiments may include structural and other modifications. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in, or substituted for, those of others. The embodiments of the present disclosure are not limited to the structures that have been described above and shown in the drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims (10)

1. An air suspension unit, comprising:

the circulating main loop is formed by connecting a gas suspension compressor, a condenser and an evaporator through refrigerant pipelines, wherein the gas suspension compressor comprises a primary compressor and a secondary compressor;

one end of the air supplementing system is communicated with a refrigerant pipeline between the condenser and the evaporator, and the other end of the air supplementing system is communicated with an air supplementing port of the air suspension compressor;

the air supply system is communicated with the liquid taking port of the circulating main loop at one end and the air supply port of the air suspension compressor at the other end;

And one end of the bypass pipeline is communicated with the exhaust port of the primary compressor, the other end of the bypass pipeline is communicated with the air suction port of the secondary compressor, and the bypass pipeline is provided with a first control valve.

2. The air levitation unit of claim 1, wherein the circulation main circuit comprises:

One end of the first exhaust pipeline is communicated with the bypass pipeline, the other end of the first exhaust pipeline is communicated with the condenser, and the first exhaust pipeline is provided with a second control valve;

One end of the second exhaust pipeline is communicated with the exhaust port of the secondary compressor, the other end of the second exhaust pipeline is communicated with the condenser, and a third control valve is arranged on the second exhaust pipeline;

One end of the main pipeline is communicated with the condenser, the other end of the main pipeline is communicated with the evaporator, and the main pipeline is provided with a first throttle valve;

And one end of the air suction pipeline is communicated with the evaporator, and the other end of the air suction pipeline is communicated with the air suction port of the primary compressor.

3. The air suspension unit of claim 2, wherein the air make-up system comprises:

One end of the first air supplementing pipeline is communicated with the main pipeline between the evaporator and the first throttle valve, the other end of the first air supplementing pipeline is communicated with an air supplementing port of the primary compressor, and a fourth control valve is arranged on the first air supplementing pipeline;

The second air supplementing pipeline, one end of the second air supplementing pipeline is communicated with the main pipeline between the evaporator and the first throttle valve, the other end of the second air supplementing pipeline is communicated with the bypass pipeline, and the second air supplementing pipeline is provided with a fifth control valve.

4. The air levitation unit of claim 2, wherein the air supply system comprises:

The refrigerant pump is communicated with a liquid taking port of the circulating main loop through a liquid taking pipeline;

The air supply tank is communicated with the refrigerant pump through a liquid outlet pipeline and is communicated with an air supply port of the air suspension compressor through an air supply pipeline.

5. The air suspension unit of claim 4 wherein the air supply line comprises:

One end of the first air supply pipeline is communicated with the air supply tank, the other end of the first air supply pipeline is communicated with an air supply port of the primary compressor, and the first air supply pipeline is provided with a second throttle valve;

the second air supply pipeline, the one end of second air supply pipeline with first air supply pipeline is linked together, the other end with the air supply mouth of second grade compressor is linked together, the second air supply pipeline is provided with the third choke valve.

6. The air suspension unit of claim 4 wherein the liquid extraction line comprises:

One end of the first liquid taking pipeline is communicated with the evaporator, the other end of the first liquid taking pipeline is communicated with the refrigerant pump, and the first liquid taking pipeline is provided with a fourth throttle valve; and/or the number of the groups of groups,

And one end of the second liquid taking pipeline is communicated with the condenser, the other end of the second liquid taking pipeline is communicated with the refrigerant pump, and a fifth throttle valve is arranged on the second liquid taking pipeline.

7. The air suspension unit according to claim 2, wherein the first exhaust line and the second exhaust line are merged into an exhaust common line, and the other end of the exhaust common line is in communication with the condenser.

8. The air levitation unit of claim 7, further comprising:

one end of the air supplementing balance pipeline is communicated with the exhaust common pipeline, the other end of the air supplementing balance pipeline is communicated with the air suction pipeline, and the air supplementing balance pipeline is provided with a sixth throttle valve; and/or the number of the groups of groups,

And one end of the air supply balance pipeline is communicated with the exhaust common pipeline, the other end of the air supply balance pipeline is communicated with the air supply tank, and the air supply balance pipeline is provided with a seventh throttle valve.

9. The air levitation unit of claim 8, further comprising:

The liquid level meter comprises a first liquid level meter and a second liquid level meter, the first liquid level meter is arranged on the evaporator, and the second liquid level meter is arranged on the air supply tank;

the pressure sensor comprises a first pressure sensor and a second pressure sensor, the first pressure sensor is arranged in the air supply tank, and the second pressure sensor is arranged in the condenser;

the flowmeter comprises a first flowmeter and a second flowmeter, the first flowmeter is arranged on the air suction pipeline, and the second flowmeter is arranged on the exhaust common pipeline;

The temperature sensor comprises a first temperature sensor, a second temperature sensor, a third temperature sensor, a fourth temperature sensor and a fifth temperature sensor, wherein the first temperature sensor is arranged on the air suction pipeline, the second temperature sensor is arranged on the first air exhaust pipeline, the third temperature sensor is arranged on the second air exhaust pipeline, the fourth temperature sensor is arranged on the evaporator, and the fifth temperature sensor is arranged on the condenser.

10. Refrigeration apparatus comprising an air suspension unit according to any one of claims 1 to 9.