Patent Application
20220268280
The present disclosure relates to the technical field of a compressor, and in particular, to a dual-stage compressor, a control method thereof, and an air conditioning unit.
Relevant single-stage compressors include a capacity adjustment mechanism. Under some conditions, when the unit operates at a relatively low load, the capacity adjustment mechanism is usually adopted to control a slider of the compressor to move and change the capacity of the compressor so as to meet the demand.
The capacity of the dual-stage compressor is usually changed by a way of variable frequency regulation, but this way cannot effectively adjust the internal volume ratio of the dual-stage compressor. When the final compression pressure of the compressor is not equal to the exhaust pressure, overcompression and undercompression occur so as to cause additional energy loss and also generate strong periodic exhaust noise.
According to an aspect of some embodiments of the present disclosure, a dual-stage compressor includes a low-pressure stage, a high-pressure stage connected in series with the low-pressure stage, and a volume ratio adjustment mechanism arranged at the high-pressure stage and configured to adjust the volume ratio of refrigerant compression at the high-pressure stage.
In some embodiments, the compressor is a screw compressor, and the volume ratio adjustment mechanism includes a first slide valve adjustment mechanism configured to adjust an output position of an exhaust port at the high-pressure stage.
In some embodiments, the dual-stage compressor further includes a capacity adjustment mechanism arranged at the low-pressure stage and configured to adjust an output capacity of refrigerant compression at the low-pressure stage.
In some embodiments, the capacity adjustment mechanism includes a second slide valve adjustment mechanism configured to adjust the output capacity of a bypass port at the low-pressure stage.
In some embodiments, the capacity adjustment mechanism includes a plunger adjustment mechanism configured to implement capacity adjustment through a suction volume of a designated bypass.
In some embodiments, the capacity adjustment mechanism includes a rotation speed adjustment mechanism configured to control suction volume by changing the rotation speed of a motor so as to implement capacity adjustment.
In some embodiments, the dual-stage compressor further includes a first driving mechanism connected with the first slide valve adjustment mechanism and configured to drive the first slide valve adjustment mechanism to move.
In some embodiments, the dual-stage compressor further includes a second driving mechanism connected with the second slide valve adjustment mechanism and configured to drive the second slide valve adjustment mechanism to move.
The present disclosure further provides a control method of the compressor, and the control method includes: when a final compression pressure of the compressor is lower than an exhaust pressure of the compressor, operating the volume ratio adjustment mechanism to increase the volume ratio of refrigerant compression at the high-pressure stage; when the final compression pressure of the compressor is greater than the exhaust pressure, operating the volume ratio adjustment mechanism to reduce the volume ratio of refrigerant compression at the high-pressure stage.
The present disclosure further provides an air conditioning unit, including the dual-stage compressor.
In the foregoing embodiment, when the final compression pressure of the compressor is lower than the exhaust pressure, the volume ratio adjustment mechanism is operated to increase the volume ratio of refrigerant compression at the high-pressure stage so that the final compression pressure of the compressor is equal to the exhaust pressure; when the final compression pressure of the compressor is greater than the exhaust pressure, the volume ratio adjustment mechanism is operated to reduce the volume ratio of refrigerant compression at the high-pressure stage so that the final compression pressure of the compressor is equal to the exhaust pressure, and overcompression and undercompression are improved to adapt to changes in external conditions, increase the energy efficiency of the compressor, and reduce the noise of the compressor.
The following clearly and completely describes the technical solution in the embodiments with reference to the accompanying drawings in the embodiments of the present disclosure. Apparently, the described embodiments are only some but not all of the embodiments of the present disclosure. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments of the present disclosure without creative efforts shall fall within the protection scope of the present disclosure.
It needs to be understood that, in the descriptions of the present disclosure, the orientation or position relationship indicated by terms such as “center”, “longitudinal”, “transverse”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “internal”, and “external” is usually based on the one as shown in the drawings, only for the purpose of facilitating and simplifying the descriptions of the present disclosure, rather than indicating or implying that referred devices or elements must have a specific orientation or be constructed and operated in a specific orientation, and thus these words cannot be understood as a limitation to the protection scope of the present disclosure.
Some embodiments of the present disclosure provide a dual-stage compressor, a control method thereof, and an air conditioning unit, so as to solve the technical problem in the related art that the dual-stage compressor has energy loss and noise caused due to inequality in the final compression pressure of the compressor and the exhaust pressure.
The final compression pressure of the compressor is the final compression pressure of the last stage (namely, a high-pressure stage) thereof.
By applying the technical solution of the present disclosure, when the final compression pressure of the compressor is lower than the exhaust pressure, the volume ratio adjustment mechanism 30 is operated to increase the volume ratio of refrigerant compression at the high-pressure stage 20 so that the final compression pressure of the compressor is equal to the exhaust pressure; when the final compression pressure of the compressor is greater than the exhaust pressure, the volume ratio adjustment mechanism 30 is operated to reduce the volume ratio of refrigerant compression at the high-pressure stage 20 so that the final compression pressure of the compressor is equal to the exhaust pressure, and overcompression and undercompression are improved to adapt to changes in external conditions, increase the energy efficiency of the compressor, and reduce the noise of the compressor.
In some embodiments, as shown in
As other optional implementation manner, the form of the volume ratio adjustment mechanism 30 is not limited to the slide valve adjustment mechanism.
In some embodiments, as shown in
As shown in
In some embodiments, the functions of capacity adjustment and internal volume ratio adjustment of the dual-stage compressor are used separately.
In some embodiments, as shown in
As other optional implementation manners, the capacity adjustment mechanism 40 may also be selected as a plunger adjustment mechanism configured to implement capacity adjustment through the suction volume of a designated bypass.
As another optional implementation manner, the capacity adjustment mechanism 40 may also be a rotation speed adjustment mechanism configured to control suction volume by changing the rotation speed of a motor so as to implement capacity adjustment. Optionally, in the technical solution of this embodiment, the capacity adjustment mechanism 40 includes a frequency converter, but the rotation speed adjustment mechanism is not limited to the frequency converter.
In some embodiments, the dual-stage compressor further includes a first driving mechanism 50 connected with the first slide valve adjustment mechanism and configured to drive the first slide valve adjustment mechanism to move.
In some embodiments, the dual-stage compressor further includes a second driving mechanism 60 connected with the second slide valve adjustment mechanism and configured to drive the second slide valve adjustment mechanism to move.
Optionally, both the first driving mechanism 50 and the second driving mechanism 60 include a movable cylinder, and the output end of the movable cylinder is connected with the first slide valve adjustment mechanism or the second slide valve adjustment mechanism so that the movable cylinder drives either the first slide valve adjustment mechanism or the second slide valve adjustment mechanism to move. Optionally, the movable cylinder is a hydraulic cylinder, or an air cylinder or an electric cylinder.
The above implementation manner is an example in which one form of capacity adjustment and internal volume ratio adjustment is selected. The stand-alone dual-stage screw compressor of the present disclosure can also be other forms capable of implementing capacity adjustment and internal volume ratio adjustment.
When the compressor is in operation and after the exhaust pressure changes, the final compression pressure of the compressor is not equal to the exhaust pressure. At this time, overcompression and undercompression occur, which brings the compressor about high noise and high power consumption.
The present disclosure also provides a control method of the dual-stage compressor, and the control method includes:
when the final compression pressure of the compressor is lower than the exhaust pressure, operating the volume ratio adjustment mechanism 30 to increase the volume ratio of refrigerant compression at the high-pressure stage of the compressor; or
when the final compression pressure of the compressor is greater than the exhaust pressure, operating the volume ratio adjustment mechanism 30 to reduce the volume ratio of refrigerant compression at the high-pressure stage of the compressor.
When the compressor is in operation and after the exhaust pressure changes, the final compression pressure of the compressor is not equal to the exhaust pressure. At this time, overcompression and undercompression occur, which brings the compressor about high noise and high power consumption. Therefore, at this time, the compressor is detected and compared for the final compression pressure and exhaust pressure to determine the pressure relationship, and an instruction for the movement direction of the output position of the high-pressure exhaust port is given. When the final compression pressure of the compressor is found not to be equal to the exhaust pressure, the exhaust pressure of the high-pressure stage 20 is adjusted to achieve the purpose of changing the final compression pressure of the compressor. When the final compression pressure of the compressor is lower than the exhaust pressure, the volume ratio adjustment mechanism 30 is operated to increase the volume ratio of refrigerant compression at the high-pressure stage 20; when the final compression pressure of the compressor is greater than the exhaust pressure, the volume ratio adjustment mechanism 30 is operated to reduce the volume ratio of refrigerant compression at the high-pressure stage 20.
Optionally, as shown in
By applying the technical solution of the present disclosure, when external pressure changes, the pressure relationship between the final compression pressure and exhaust pressure of the compressor is determined through detection, and an instruction is issued to the internal volume ratio adjustment structure; the position of the high-pressure exhaust port is adjusted, so that the final compression pressure is approximate to the exhaust pressure, and overcompression and undercompression are improved to adapt to changes in external conditions, increase the energy efficiency of the compressor, and reduce the noise of the compressor.
The present disclosure further provides an air conditioning unit, including the dual-stage compressor. The energy efficiency of the air conditioning unit can be improved by using the dual-stage compressor.
In the descriptions of the present disclosure, it should be understood that terms such as “first” and “second” are used to define parts, only for the ease of distinguishing the parts. Unless otherwise stated, the terms have no special meanings, and therefore cannot be understood as a limitation to the protection scope of the present disclosure.
Finally, it should be noted that the foregoing embodiments are merely intended for describing the technical solution of the present disclosure, but not for limiting the present disclosure. Although the present disclosure is described in detail with reference to the preferred embodiments, persons of ordinary skill in the art should understand that they may still make modifications to the specific implementation manners of the present disclosure or make equivalent replacements to some technical features thereof, without departing from the scope of the technical solution of the present disclosure. Such modifications and replacements should be covered within the technical solution claimed for protection by the present disclosure.
| Number | Date | Country | Kind |
|---|---|---|---|
| 201910860820.0 | Sep 2019 | CN | national |
The present disclosure is a U.S. National Stage Application under 35 U.S.C. § 371 of International Patent Application No. PCT/CN2020/098925, filed on Jun. 29, 2020, which is based upon and claims priority to Chinese (CN) Patent Application No. 201910860820.0, filed on Sep. 11, 2019, the entire contents of all of which are incorporated herein by reference.
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/CN2020/098925 | 6/29/2020 | WO |
