CN110566461A - two-stage compressor, control method of two-stage compressor and air conditioning unit - Google Patents

two-stage compressor, control method of two-stage compressor and air conditioning unit Download PDF

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Publication number
CN110566461A
CN110566461A CN201910860820.0A CN201910860820A CN110566461A CN 110566461 A CN110566461 A CN 110566461A CN 201910860820 A CN201910860820 A CN 201910860820A CN 110566461 A CN110566461 A CN 110566461A
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CN
China
Prior art keywords
pressure
compressor
stage
volume ratio
compression
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
CN201910860820.0A
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Chinese (zh)
Inventor
刘华
张治平
龙忠铿
李日华
毕雨时
武晓昆
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Gree Electric Appliances Inc of Zhuhai
Original Assignee
Gree Electric Appliances Inc of Zhuhai
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Gree Electric Appliances Inc of Zhuhai filed Critical Gree Electric Appliances Inc of Zhuhai
Priority to CN201910860820.0A priority Critical patent/CN110566461A/en
Publication of CN110566461A publication Critical patent/CN110566461A/en
Priority to US17/627,001 priority patent/US20220268280A1/en
Priority to PCT/CN2020/098925 priority patent/WO2021047247A1/en
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C18/12—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
    • F04C18/14—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
    • F04C18/16—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
    • F04C23/001—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids of similar working principle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
    • F04C28/02—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids specially adapted for several pumps connected in series or in parallel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
    • F04C28/10—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by changing the positions of the inlet or outlet openings with respect to the working chamber
    • F04C28/12—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by changing the positions of the inlet or outlet openings with respect to the working chamber using sliding valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
    • F04C28/10—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by changing the positions of the inlet or outlet openings with respect to the working chamber
    • F04C28/12—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by changing the positions of the inlet or outlet openings with respect to the working chamber using sliding valves
    • F04C28/125—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by changing the positions of the inlet or outlet openings with respect to the working chamber using sliding valves with sliding valves controlled by the use of fluid other than the working fluid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2270/00—Control; Monitoring or safety arrangements
    • F04C2270/05—Speed
    • F04C2270/052—Speed angular
    • F04C2270/0525—Controlled or regulated
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2270/00—Control; Monitoring or safety arrangements
    • F04C2270/21—Pressure difference
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
    • F04C28/08—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by varying the rotational speed

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The application provides a two-stage compressor, a control method of the two-stage compressor and an air conditioning unit. The dual stage compressor includes a low pressure stage and a high pressure stage in series with the low pressure stage. The two-stage compressor also comprises a volume ratio adjusting mechanism which is arranged on the high-pressure stage and used for changing the volume ratio of the high-pressure stage to the compression of the refrigerant. By applying the technical scheme of the invention, when the compression end pressure of the compressor is less than the exhaust pressure, the volume ratio adjusting mechanism is operated to increase the volume ratio of the high-pressure stage to the refrigerant compression, so that the compression end pressure of the compressor is equal to the exhaust pressure; when the compression final pressure of the compressor is larger than the exhaust pressure, the volume ratio adjusting mechanism is operated to reduce the volume ratio of the high-pressure stage to the refrigerant compression, so that the compression final pressure of the compressor is equal to the exhaust pressure, the situations of over-compression and under-compression are improved, the change of external conditions is adapted, the energy efficiency of the compressor is improved, and the noise of the compressor is reduced.

Description

Two-stage compressor, control method of two-stage compressor and air conditioning unit
Technical Field
The invention relates to the technical field of compressors, in particular to a two-stage compressor, a control method of the two-stage compressor and an air conditioning unit.
Background
In the conventional single-stage compressor, a capacity adjustment mechanism is used. Under some conditions, the unit needs to operate under a smaller load working condition, and the compressor slider is controlled to move to change the capacity to meet the requirement.
However, in a two-stage compressor, the capacity is generally changed only by performing variable frequency modulation on the compressor. The inability to effectively adjust the internal volume ratio of a two-stage compressor results in over-compression and under-compression conditions in the compressor when the final compression pressure and the discharge pressure are not equal, both of which result in additional energy loss and strong periodic discharge noise.
Disclosure of Invention
The embodiment of the invention provides a two-stage compressor, a control method of the two-stage compressor and an air conditioning unit, and aims to solve the technical problems of energy loss and noise caused by unequal pressure and exhaust pressure at the end of compression of the two-stage compressor in the prior art.
The embodiment of this application provides a double stage compressor, including low-pressure stage and with the serial high-pressure stage of low-pressure stage, double stage compressor still includes: and the volume ratio adjusting mechanism is arranged on the high-pressure stage and used for changing the volume ratio of the high-pressure stage to the refrigerant compression.
In one embodiment, the compressor is a screw compressor, and the volume ratio adjustment mechanism is a first slide valve adjustment mechanism for changing an output position of the exhaust port of the high pressure stage.
In one embodiment, the two-stage compressor further comprises a capacity adjustment mechanism disposed at the low-pressure stage for varying an output capacity of the low-pressure stage for compressing the refrigerant.
in one embodiment, the capacity adjustment mechanism is a second slide valve adjustment mechanism for varying the output of the bypass port of the low pressure stage.
In one embodiment, the volume adjustment mechanism is a plunger adjustment mechanism for volume adjustment by fixed point bypass inhalation volume.
In one embodiment, the capacity adjustment mechanism is a rotation speed adjustment mechanism that controls the suction amount by changing the rotation speed of the motor to achieve capacity adjustment.
In one embodiment, the dual stage compressor further comprises a first drive mechanism coupled to the first slide valve adjustment mechanism for driving movement of the first slide valve adjustment mechanism.
In one embodiment, the dual stage compressor further comprises a second drive mechanism coupled to the second slide valve adjustment mechanism for driving movement of the second slide valve adjustment mechanism.
The application also provides a control method of the two-stage compressor, which is used for controlling the compressor and comprises the following steps: when the compression final pressure of the compressor is smaller than the exhaust pressure, operating the volume ratio adjusting mechanism to increase the volume ratio of the high-pressure stage to the refrigerant compression; when the compression end pressure of the compressor is greater than the discharge pressure, the volume ratio adjusting mechanism is operated to reduce the volume ratio of the high-pressure stage to the refrigerant compression.
The application also provides an air conditioning unit, which comprises the double-stage compressor, wherein the double-stage compressor is the double-stage compressor.
In the above embodiment, when the compression end pressure of the compressor is smaller than the discharge pressure, the volume ratio adjusting mechanism is operated to increase the volume ratio of the high-pressure stage to the refrigerant compression, so that the compression end pressure of the compressor is equal to the discharge pressure; when the compression final pressure of the compressor is greater than the exhaust pressure, the volume ratio adjusting mechanism is operated to reduce the volume ratio of the high-pressure stage to the refrigerant compression, so that the compression final pressure of the compressor is equal to the exhaust pressure, the situations of over-compression and under-compression are improved, the change of external conditions is adapted, the energy efficiency of the compressor is improved, and the noise of the compressor is reduced.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
Fig. 1 is a schematic overall structural view of an embodiment of a two-stage compressor according to the present invention;
FIG. 2 is a schematic diagram of the high pressure stage of the dual stage compressor of FIG. 1;
Fig. 3 is a schematic diagram of the construction of the low pressure stage of the dual stage compressor of fig. 1.
Detailed Description
in order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the following embodiments and accompanying drawings. The exemplary embodiments and descriptions of the present invention are provided to explain the present invention, but not to limit the present invention.
Fig. 1 and 2 show an embodiment of the two-stage compressor of the invention comprising a low-pressure stage 10 and a high-pressure stage 20 in series with the low-pressure stage 10. The two-stage compressor further includes a volume ratio adjusting mechanism 30 disposed on the high-pressure stage 20 for changing a volume ratio of the high-pressure stage 20 to the compression of the refrigerant.
By applying the technical scheme of the invention, when the compression end pressure of the compressor is smaller than the exhaust pressure, the volume ratio adjusting mechanism 30 is operated to increase the volume ratio of the high-pressure stage 20 to the refrigerant compression, so that the compression end pressure of the compressor is equal to the exhaust pressure; when the compression final pressure of the compressor is greater than the discharge pressure, the volume ratio adjusting mechanism 30 is operated to reduce the volume ratio of the high-pressure stage 20 to the refrigerant compression, so that the compression final pressure of the compressor is equal to the discharge pressure, the situations of over-compression and under-compression are improved, the change of external conditions is adapted, the energy efficiency of the compressor is improved, and the noise of the compressor is reduced.
alternatively, in the technical solution of the present embodiment, as shown in fig. 2, the compressor is a screw compressor, the volume ratio adjusting mechanism 30 is a first slide valve adjusting mechanism, and the first slide valve adjusting mechanism is used for changing the output position of the exhaust port 21 of the high pressure stage. By varying the output position of the discharge port 21 of the high pressure stage, it is possible to discharge the refrigerant of different volume ratios from the high pressure stage 20. Specifically, the volume ratio of the refrigerant at the output position of the high-pressure-stage discharge port 21 closer to the screw input end is lower, and the volume ratio of the refrigerant at the output position of the high-pressure-stage discharge port 21 closer to the screw output end is higher. When the high-pressure stage 20 is used, the regulating slide block moves leftwards, and the exhaust port 21 of the high-pressure stage moves leftwards at the moment, so that the compression end pressure of the high-pressure stage 20 is reduced, and the compression end pressure of the high-pressure stage 20 is equal to the exhaust pressure. The first slide valve adjusting mechanism is controlled to a set position, and the internal volume ratio is changed to match the compression final pressure with the exhaust pressure, so that the noise of the compressor is reduced, and the energy efficiency of the compressor is improved.
As other alternative embodiments, the form of the volume ratio adjusting mechanism 30 is not limited to the spool valve.
in addition, as shown in fig. 1, the two-stage compressor further includes a bearing 80 bridging the low-pressure stage 10 and the high-pressure stage 20, and a motor 70 driving the low-pressure stage 10 and the high-pressure stage 20 to rotate.
As shown in fig. 1 and 3, in the solution of the present embodiment, the two-stage compressor further includes a capacity adjustment mechanism 40, which is disposed on the low-pressure stage 10 and is used for changing the output capacity of the low-pressure stage 10 for compressing the refrigerant. Thus, the technical scheme of the invention not only has the functions of capacity adjustment and internal volume ratio adjustment. The compressor can adjust the capacity of the compressor according to external requirements, and meet the requirements of different load operation. Meanwhile, the internal volume ratio can be adjusted according to the change of the external pressure, the compression end pressure of the compressor is changed, and the situations of over compression and under compression are avoided, so that the noise is reduced, and the energy efficiency of the compressor is improved.
In the conventional compressor, the capacity adjustment and the internal volume ratio adjustment are used separately. Alternatively, as shown in fig. 3, in the solution of the present embodiment, the capacity adjustment mechanism 40 is a second slide valve adjustment mechanism, and the second slide valve adjustment mechanism is used for changing the output quantity of the bypass port 11 of the low pressure stage. When the front end of the second slide valve adjusting mechanism is completely contacted with the stop, the bypass port 11 of the low pressure stage is closed at this time, and the compressor is in a full load state. When partial load operation needs exist, the system moves rightwards through the second sliding valve adjusting mechanism, at the moment, the bypass port 11 of the low-pressure stage is communicated with the air suction side, namely, the partially compressed gas bypasses to the air suction side, the actual air suction amount is changed, and partial meeting of the needs can be realized.
As other alternative embodiments, the volume adjustment mechanism 40 may also be selected as a plunger adjustment mechanism for achieving volume adjustment by fixed-point bypass inhalation amount.
As another alternative, the capacity adjustment mechanism 40 may also be a rotation speed adjustment mechanism, and the rotation speed adjustment mechanism controls the suction amount by changing the rotation speed of the motor to achieve capacity adjustment. Specifically, in the present embodiment, the capacity adjustment mechanism 40 is an inverter, but the rotation speed adjustment mechanism is not limited to an inverter.
As an alternative implementation manner, in the solution of the present embodiment, the dual-stage compressor further includes a first driving mechanism 50, and the first driving mechanism 50 is connected to the first slide valve adjusting mechanism for driving the first slide valve adjusting mechanism to move. Optionally, the dual stage compressor further comprises a second driving mechanism 60, and the second driving mechanism 60 is connected to the second slide valve adjusting mechanism for driving the second slide valve adjusting mechanism to move. Preferably, the first driving mechanism 50 and the second driving mechanism 60 are movable cylinders, and the output end of each movable cylinder is connected with the first slide valve adjusting mechanism or the second slide valve adjusting mechanism, so that the movable cylinder drives the first slide valve adjusting mechanism and the second slide valve adjusting mechanism to move. Optionally, the movable cylinder is a hydraulic cylinder or an air cylinder or an electric cylinder.
As the above embodiment exemplifies one form of selection of the capacity modulation and the internal volume ratio modulation, the single two-stage screw compressor of the present invention may adopt other forms that can realize the capacity modulation and the internal volume ratio modulation.
When the compressor runs, after the exhaust pressure changes, the compression end pressure of the compressor is not equal to the exhaust pressure, and the conditions of over compression and under compression can occur at the moment, so that the problems of high noise and high power consumption of the compressor are caused.
The invention also provides a control method of the two-stage compressor, which is used for controlling the compressor and comprises the following steps:
When the compression end pressure of the compressor is smaller than the discharge pressure, the volume ratio adjusting mechanism 30 is operated to increase the volume ratio of the compressor to the compression of the refrigerant;
When the compression end pressure of the compressor is greater than the discharge pressure, the volume ratio adjustment mechanism 30 is operated to decrease the volume ratio of the compressor to the compression of the refrigerant.
When the compressor is operated, after the exhaust pressure changes, the compression end pressure of the compressor is not equal to the exhaust pressure, and the conditions of over compression and under compression can occur at the moment, so that the problems of high noise and high power consumption of the compressor are caused. Therefore, at this time, the compressor detects and compares the compression end pressure and the exhaust pressure, compares the pressures and judges the pressure relationship to give an instruction of the moving direction of the slide block. When the compression end pressure of the compressor is detected to be unequal to the discharge pressure, the discharge pressure of the high-pressure stage 20 is adjusted to achieve the purpose of changing the compression end pressure of the compressor. When the compression end pressure of the compressor is smaller than the discharge pressure, the volume ratio adjusting mechanism 30 is operated to increase the volume ratio of the high-pressure stage 20 to the refrigerant compression; when the compression end pressure of the compressor is greater than the discharge pressure, the volume ratio adjustment mechanism 30 is operated to decrease the volume ratio of the high-pressure stage 20 to the compression of the refrigerant.
Specifically, as shown in fig. 2, in combination with the above-mentioned embodiment of the sliding valve adjusting mechanism, when the compression end pressure of the high-pressure stage is less than the discharge pressure, a command is issued to move the first sliding valve adjusting mechanism to the right, and at this time, the position of the discharge port moves backward, so that the compression end pressure of the high-pressure stage 20 is increased, and the compression end pressure of the compressor is equal to the discharge pressure; when the compression end pressure of the compressor is larger than the exhaust pressure, a command is given to the first slide valve adjusting mechanism to move leftwards, and the exhaust hole position moves forwards at the moment, so that the compression end pressure of the high-pressure stage 20 is reduced, and the compression end pressure of the compressor is equal to the exhaust pressure. The first slide valve adjusting mechanism is controlled to move to a set position, and the internal volume ratio is changed to enable the compression end pressure to be matched with the exhaust pressure, so that the noise of the compressor is reduced, and the energy efficiency of the compressor is improved.
By applying the technical scheme of the invention, when the external pressure changes, the compression end pressure and the exhaust pressure can be detected, the relation between the compression end pressure and the exhaust pressure is judged, an instruction is sent to the internal volume ratio adjusting structure, and the position of the low-pressure stage exhaust hole is adjusted, so that the compression end pressure is close to the exhaust pressure, the situations of over compression and under compression are improved, the external condition change is adapted, the energy efficiency of the compressor is improved, and the noise of the compressor is reduced.
The invention also provides an air conditioning unit which comprises the double-stage compressor. By adopting the two-stage compressor, the energy efficiency of the air conditioning unit can be improved.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes may be made to the embodiment of the present invention by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. a two-stage compressor comprising a low-pressure stage (10) and a high-pressure stage (20) in series with the low-pressure stage (10), characterized in that it further comprises:
And the volume ratio adjusting mechanism (30) is arranged on the high-pressure stage (20) and is used for changing the volume ratio of the high-pressure stage (20) to the refrigerant compression.
2. The two-stage compressor according to claim 1, wherein the compressor is a screw compressor, and the volume ratio adjusting mechanism (30) is a first slide valve adjusting mechanism for changing an output position of the discharge port (21) of the high-pressure stage.
3. The two-stage compressor according to claim 1, further comprising a capacity adjustment mechanism (40) provided at the low-pressure stage (10) for varying an output capacity of the low-pressure stage (10) for compressing the refrigerant.
4. The two-stage compressor according to claim 3, characterized in that the capacity modulation mechanism (40) is a second slide valve modulation mechanism for varying the output of the bypass port (11) of the low-pressure stage.
5. The two-stage compressor of claim 3, wherein the capacity modulation mechanism (40) is a plunger modulation mechanism for achieving capacity modulation through fixed-point bypass suction.
6. The two-stage compressor according to claim 3, wherein the capacity modulation mechanism (40) is a speed modulation mechanism that controls suction by varying motor speed to achieve capacity modulation.
7. The dual-stage compressor of claim 2, further comprising a first drive mechanism (50), the first drive mechanism (50) being coupled to the first slide valve adjustment mechanism for driving movement of the first slide valve adjustment mechanism.
8. The dual-stage compressor of claim 4, further comprising a second drive mechanism (60), the second drive mechanism (60) being coupled to the second slide valve adjustment mechanism for driving movement of the second slide valve adjustment mechanism.
9. A control method of a two-stage compressor for controlling the compressor of any one of claims 1 to 8, the control method comprising:
When the compression end pressure of the compressor is smaller than the discharge pressure, operating the volume ratio adjusting mechanism (30) to increase the volume ratio of the high-pressure stage (20) to the refrigerant compression;
And when the compression final pressure of the compressor is greater than the discharge pressure, operating the volume ratio adjusting mechanism (30) to reduce the volume ratio of the high-pressure stage (20) to the refrigerant compression.
10. Air conditioning assembly comprising a two-stage compressor, characterized in that it is a two-stage compressor according to any one of claims 1 to 8.
CN201910860820.0A 2019-09-11 2019-09-11 two-stage compressor, control method of two-stage compressor and air conditioning unit Withdrawn CN110566461A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN201910860820.0A CN110566461A (en) 2019-09-11 2019-09-11 two-stage compressor, control method of two-stage compressor and air conditioning unit
US17/627,001 US20220268280A1 (en) 2019-09-11 2020-06-29 Dual-Stage Compressor, Control Method Thereof and Air Conditioning Unit
PCT/CN2020/098925 WO2021047247A1 (en) 2019-09-11 2020-06-29 Two-stage compressor and control method of two-stage compressor, and air conditioning unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201910860820.0A CN110566461A (en) 2019-09-11 2019-09-11 two-stage compressor, control method of two-stage compressor and air conditioning unit

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Publication Number Publication Date
CN110566461A true CN110566461A (en) 2019-12-13

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US (1) US20220268280A1 (en)
CN (1) CN110566461A (en)
WO (1) WO2021047247A1 (en)

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Application publication date: 20191213