CN109357452B - Compressor cylinder body switching detection method and device and air conditioner - Google Patents

Compressor cylinder body switching detection method and device and air conditioner Download PDF

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Publication number
CN109357452B
CN109357452B CN201811219699.5A CN201811219699A CN109357452B CN 109357452 B CN109357452 B CN 109357452B CN 201811219699 A CN201811219699 A CN 201811219699A CN 109357452 B CN109357452 B CN 109357452B
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China
Prior art keywords
compressor
pressure
difference
frequency
suction
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CN201811219699.5A
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Chinese (zh)
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CN109357452A (en
Inventor
余凯
李龙飞
刘群波
倪毅
许克
戎耀鹏
张仲秋
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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Priority to CN201811219699.5A priority Critical patent/CN109357452B/en
Priority to PCT/CN2018/120558 priority patent/WO2020077775A1/en
Publication of CN109357452A publication Critical patent/CN109357452A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F25B49/022—Compressor control arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/02—Compressor control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/19—Pressures
    • F25B2700/193—Pressures of the compressor
    • F25B2700/1931—Discharge pressures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/19—Pressures
    • F25B2700/193—Pressures of the compressor
    • F25B2700/1933—Suction pressures

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Positive-Displacement Pumps (AREA)

Abstract

The disclosure provides a compressor cylinder body switching detection method and device and an air conditioner. The compressor cylinder body switching detection device detects whether the suction pressure and the exhaust pressure of the compressor are in a stable state or not, detects the pressure parameter of the compressor as a first parameter value under the condition that the suction pressure and the exhaust pressure of the compressor are in the stable state, performs cylinder body switching operation on the compressor, detects the pressure parameter of the compressor again as a second parameter value after a preset time, calculates the change rate of the pressure parameter according to the first parameter value and the second parameter value, and determines that the cylinder body switching of the compressor is successful under the condition that the change rate of the pressure parameter is greater than a preset threshold. According to the method, the pressure parameter change rate of the compressor before and after cylinder body switching is utilized, whether the compressor successfully completes the cylinder body switching can be conveniently determined. Therefore, the control can be carried out according to the actual running state of the compressor, so that the performance of the compressor can be optimized.

Description

Compressor cylinder body switching detection method and device and air conditioner
Technical Field
The disclosure relates to the field of control, in particular to a compressor cylinder switching detection method and device and an air conditioner.
Background
At present, under the condition of single-cylinder operation or multi-cylinder operation of a compressor, the aspects of air suction volume, air displacement, motor efficiency, lubricating system control and the like of the compressor are different, so that the characteristics of the single-cylinder operation or the multi-cylinder operation of the compressor need to be respectively controlled to optimize the performance of the compressor.
Disclosure of Invention
The inventor finds that in the process of capacity change of the compressor, whether cylinder body switching of the compressor is successful or not cannot be accurately judged, so that control cannot be performed according to the actual operation state of the compressor, and the performance of the compressor cannot be optimized.
Therefore, the scheme capable of detecting cylinder switching of the compressor is provided by the disclosure.
According to an aspect of one or more embodiments of the present disclosure, there is provided a compressor cylinder switching detection method including: detecting whether the suction pressure and the discharge pressure of the compressor are in a steady state; detecting a pressure parameter of the compressor as a first parameter value under the condition that the suction pressure and the discharge pressure of the compressor are in a steady state; performing cylinder switching operation on the compressor; detecting the pressure parameter of the compressor again after a preset time as a second parameter value; calculating the change rate of the pressure parameter according to the first parameter value and the second parameter value; and determining that the cylinder body of the compressor is successfully switched under the condition that the change rate of the pressure parameter is greater than a preset threshold.
In some embodiments, the pressure parameter is a discharge pressure or a suction pressure of the compressor.
In some embodiments, before detecting whether the suction pressure and the discharge pressure of the compressor are in a steady state, the method further comprises: and adjusting the difference between the discharge pressure and the suction pressure of the compressor to be within a preset pressure difference range.
In some embodiments, adjusting the difference between the discharge pressure and the suction pressure of the compressor to be within a predetermined pressure difference range comprises: detecting the discharge pressure and the suction pressure of the compressor; and in the case that the difference between the discharge pressure and the suction pressure of the compressor is not within the preset pressure difference range, performing pressure regulation on the compressor so as to control the difference between the discharge pressure and the suction pressure of the compressor within the preset pressure difference range.
In some embodiments, pressure regulating the compressor comprises: and under the condition that the difference between the discharge pressure and the suction pressure of the compressor is smaller than the lower limit of the preset pressure difference range, performing first adjustment on the compressor to increase the difference between the discharge pressure and the suction pressure of the compressor.
In some embodiments, the first adjustment comprises: and increasing the working frequency of the compressor.
In some embodiments, a second adjustment is made to the compressor to reduce the difference between the discharge pressure and the suction pressure of the compressor in the event that the difference between the discharge pressure and the suction pressure of the compressor is greater than the upper limit of the predetermined pressure differential range.
In some embodiments, the second adjusting comprises: reducing the operating frequency of the compressor.
In some embodiments, the second adjusting further comprises: and adjusting the air suction and exhaust bypass mechanism to release pressure.
In some embodiments, in a case where the suction pressure and the discharge pressure of the compressor are at steady states, further comprising: adjusting the operating frequency of the compressor to be within a predetermined frequency range, and then performing the step of detecting the pressure parameter of the compressor.
In some embodiments, adjusting the operating frequency of the compressor to be within a predetermined frequency range comprises: detecting the working frequency of the compressor; and in the case that the working frequency of the compressor is not in the preset frequency range, performing frequency adjustment on the compressor so as to control the working frequency of the compressor to be in the preset frequency range.
In some embodiments, frequency adjusting the compressor comprises: and under the condition that the working frequency of the compressor is less than the lower limit of the preset frequency range, increasing the working frequency of the compressor.
In some embodiments, the operating frequency of the compressor is reduced in the event that the operating frequency of the compressor is greater than the upper limit of the predetermined frequency range.
According to another aspect of one or more embodiments of the present disclosure, there is provided a compressor cylinder switching detecting device including: a steady state detection module configured to detect whether a suction pressure and a discharge pressure of the compressor are in a steady state; the speed detection module is configured to detect a pressure parameter of the compressor as a first parameter value under the condition that the suction pressure and the discharge pressure of the compressor are in a steady state; after the cylinder body switching module performs cylinder body switching operation on the compressor, detecting the pressure parameter of the compressor again after a preset time as a second parameter value; calculating the change rate of the pressure parameter according to the first parameter value and the second parameter value, and determining that the cylinder body of the compressor is successfully switched under the condition that the change rate of the pressure parameter is greater than a preset threshold; a cylinder switching module configured to perform a cylinder switching operation on the compressor.
In some embodiments, the pressure parameter is a discharge pressure or a suction pressure of the compressor.
In some embodiments, the pressure difference adjustment module is configured to adjust a difference between a discharge pressure and a suction pressure of the compressor to be within a predetermined pressure difference range before the steady state detection module detects whether the suction pressure and the discharge pressure of the compressor are in a steady state.
In some embodiments, the pressure difference adjustment module is configured to detect a discharge pressure and a suction pressure of the compressor, and in a case where a difference between the discharge pressure and the suction pressure of the compressor is not within the predetermined pressure difference range, pressure-regulate the compressor so as to control a difference between the discharge pressure and the suction pressure of the compressor within the predetermined pressure difference range.
In some embodiments, the pressure differential adjustment module is further configured to make a first adjustment to the compressor to increase a difference between a discharge pressure and a suction pressure of the compressor if the difference between the discharge pressure and the suction pressure of the compressor is less than a lower limit of the predetermined pressure differential range.
In some embodiments, the first adjustment comprises: and increasing the working frequency of the compressor.
In some embodiments, the pressure differential adjustment module is further configured to make a second adjustment to the compressor to reduce a difference between a discharge pressure and a suction pressure of the compressor if the difference between the discharge pressure and the suction pressure of the compressor is greater than an upper limit of the predetermined pressure differential range.
In some embodiments, the second adjusting comprises: reducing the operating frequency of the compressor.
In some embodiments, the second adjusting further comprises: and adjusting the air suction and exhaust bypass mechanism to release pressure.
In some embodiments, the above apparatus further comprises: and the frequency adjusting module is configured to adjust the working frequency of the compressor to be within a preset frequency range under the condition that the suction pressure and the discharge pressure of the compressor are in a steady state, and then instruct the speed detecting module to perform the operation of detecting the pressure parameter of the compressor.
In some embodiments, the frequency adjustment module is configured to detect an operating frequency of the compressor, and in the event that the operating frequency of the compressor is not within the predetermined frequency range, perform a frequency adjustment of the compressor to control the operating frequency of the compressor within the predetermined frequency range.
In some embodiments, the frequency adjustment module is configured to increase the operating frequency of the compressor if the operating frequency of the compressor is less than a lower limit of the predetermined frequency range.
In some embodiments, the frequency adjustment module is further configured to decrease the operating frequency of the compressor if the operating frequency of the compressor is greater than an upper limit of the predetermined frequency range.
According to another aspect of one or more embodiments of the present disclosure, there is provided a compressor cylinder switching detecting device including: a memory configured to store instructions; a processor coupled to the memory, the processor configured to perform a method according to any of the embodiments described above based on instructions stored in the memory.
According to another aspect of one or more embodiments of the present disclosure, there is provided an air conditioner including a compressor cylinder switching detecting device as described in any of the above embodiments.
According to another aspect of one or more embodiments of the present disclosure, there is provided a computer-readable storage medium, wherein the computer-readable storage medium stores computer instructions, which when executed by a processor, implement a method as described above in relation to any one of the embodiments.
Other features of the present disclosure and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and for those skilled in the art, other drawings can be obtained according to the drawings without inventive exercise.
Fig. 1 is an exemplary flowchart of a compressor cylinder switching detection method according to an embodiment of the present disclosure;
FIG. 2 is an exemplary flow chart of a compressor cylinder switch detection method according to another embodiment of the present disclosure;
FIG. 3 is an exemplary flow chart of a pressure differential adjustment method according to one embodiment of the present disclosure;
FIG. 4 is an exemplary flow chart of a compressor cylinder switch detection method according to yet another embodiment of the present disclosure;
fig. 5 is an exemplary flow chart of a frequency adjustment method of one embodiment of the present disclosure;
FIG. 6 is an exemplary block diagram of a compressor cylinder switching detection device according to one embodiment of the present disclosure;
FIG. 7 is an exemplary block diagram of a compressor cylinder switching detection device according to another embodiment of the present disclosure;
fig. 8 is an exemplary block diagram of a compressor cylinder switching detecting device according to still another embodiment of the present disclosure.
Detailed Description
The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are only a part of the embodiments of the present disclosure, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the disclosure, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.
The relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present disclosure unless specifically stated otherwise.
Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
Fig. 1 is an exemplary flowchart of a compressor cylinder switching detection method according to an embodiment of the present disclosure. In some embodiments, the above-described compressor cylinder switching detection method may be performed by a compressor cylinder switching device.
In step 101, it is detected whether the suction pressure and discharge pressure of the compressor are in steady state.
In some embodiments, the suction pressures PT1 and PT2 of the compressor are respectively detected at predetermined time intervals T, and it is determined that the suction pressure of the compressor is in a steady state if the suction pressure change rate Δ P | PT2-PT1|/T is less than a predetermined threshold.
Accordingly, discharge pressures PT3 and PT4 of the compressor are respectively detected at predetermined time intervals T, and it is determined that the discharge pressure of the compressor is in a steady state if a discharge pressure change rate Δ P | PT4-PT3|/T is less than a predetermined threshold.
In step 102, a pressure parameter of the compressor is detected as a first parameter value in a case where a suction pressure and a discharge pressure of the compressor are in a steady state.
In some embodiments, the pressure parameter is a discharge pressure or a suction pressure of the compressor.
In step 103, a cylinder switching operation is performed on the compressor.
In some embodiments, the compressor may be switched from single cylinder to double cylinder or with additional cylinders. In other embodiments, the compressor may be switched from a dual cylinder to a single cylinder or a reduced cylinder. The compressor may be a multi-rotor compressor, and each compression cylinder of the compressor may be a cylinder of equal volume or a cylinder of unequal volume.
At step 104, the pressure parameter of the compressor is detected again as a second parameter value after a predetermined time.
At step 105, a rate of change of the pressure parameter is calculated based on the first parameter value and the second parameter value.
In step 106, in the case that the rate of change of the pressure parameter is greater than a predetermined threshold, it is determined that the cylinder switching of the compressor is successful.
In the method for detecting cylinder switching of the compressor provided by the embodiment of the disclosure, whether the compressor successfully completes the cylinder switching can be conveniently determined by using the pressure parameter change rate of the compressor before and after the cylinder switching. Therefore, the control can be carried out according to the actual running state of the compressor, so that the performance of the compressor can be optimized.
Fig. 2 is an exemplary flowchart of a compressor cylinder switching detection method according to another embodiment of the present disclosure. In some embodiments, the above-described compressor cylinder switching detection method may be performed by a compressor cylinder switching device.
In step 201, the difference between the discharge pressure and the suction pressure of the compressor is adjusted to be within a predetermined pressure difference range.
By adjusting the difference between the discharge pressure and the suction pressure of the compressor to be within a predetermined differential pressure range, the accuracy of cylinder switching detection can be facilitated.
FIG. 3 is an exemplary flow chart of a pressure differential adjustment method according to one embodiment of the present disclosure. In some embodiments, the pressure difference adjustment method described above may be performed by a compressor cylinder switching device.
In step 301, the discharge pressure and suction pressure of the compressor are detected.
In step 302, in the case that a difference between a discharge pressure and a suction pressure of the compressor is not within a predetermined differential pressure range, the compressor is pressure-regulated so as to control the difference between the discharge pressure and the suction pressure of the compressor within the predetermined differential pressure range.
In some embodiments, a first adjustment is made to the compressor to increase the difference between the discharge pressure and the suction pressure of the compressor in the event that the difference between the discharge pressure and the suction pressure of the compressor is less than the lower limit of the predetermined pressure differential range. For example, the first adjustment includes raising the operating frequency of the compressor.
In other embodiments, a second adjustment is made to the compressor to reduce the difference between the discharge pressure and the suction pressure of the compressor in the event that the difference between the discharge pressure and the suction pressure of the compressor is greater than the upper limit of the predetermined pressure differential range. For example, the second adjustment includes reducing the operating frequency of the compressor. In addition, the second adjustment may further include adjusting the suction-exhaust bypass mechanism to allow for pressure relief.
For example, the predetermined pressure difference range is [ a1, b1 ]. If the pressure difference between the discharge pressure and the suction pressure of the compressor is less than a1, the pressure difference is raised by means of raising the frequency of the compressor or the like so that the pressure difference falls within a predetermined pressure difference range [ a1, b1 ]. If the pressure difference is larger than b1, the pressure difference is reduced by means of compressor frequency reduction, opening a bypass mechanism on the air suction side and the air exhaust side for pressure relief and the like, so that the pressure difference falls into a preset pressure difference range [ a1, b1 ].
Returning to fig. 2. In step 202, it is checked whether the suction pressure and discharge pressure of the compressor are at steady state.
In step 203, a pressure parameter of the compressor is detected as a first parameter value in a case where a suction pressure and a discharge pressure of the compressor are in a steady state.
In some embodiments, the pressure parameter is a discharge pressure or a suction pressure of the compressor.
In step 204, a cylinder switching operation is performed on the compressor.
In step 205, the pressure parameter of the compressor is detected again as a second parameter value after a predetermined time.
At step 206, a rate of change of the pressure parameter is calculated based on the first parameter value and the second parameter value.
In step 207, in case the rate of change of the pressure parameter is greater than a predetermined threshold, it is determined that the cylinder switching of the compressor is successful.
Fig. 4 is an exemplary flowchart of a compressor cylinder switching detection method according to still another embodiment of the present disclosure. In some embodiments, the above-described compressor cylinder switching detection method may be performed by a compressor cylinder switching device.
In step 401, a difference between a discharge pressure and a suction pressure of a compressor is adjusted to be within a predetermined pressure difference range.
By adjusting the difference between the discharge pressure and the suction pressure of the compressor to be within a predetermined differential pressure range, the accuracy of cylinder switching detection can be facilitated.
At step 402, it is checked whether the suction pressure and discharge pressure of the compressor are at steady state.
In step 403, the operating frequency of the compressor is adjusted to be within a predetermined frequency range in the case where the suction pressure and the discharge pressure of the compressor are in a steady state.
By adjusting the operating frequency of the compressor to within a predetermined frequency range, the accuracy of cylinder switching detection can be facilitated.
Fig. 5 is an exemplary flowchart of a frequency adjustment method according to an embodiment of the present disclosure. In some embodiments, the frequency adjustment method may be performed by a compressor cylinder switching device.
In step 501, the operating frequency of the compressor is detected.
In step 502, in case the operating frequency of the compressor is not within the predetermined frequency range, the frequency adjustment is performed on the compressor so as to control the operating frequency of the compressor within the predetermined frequency range.
In some embodiments, the operating frequency of the compressor is increased in the event that the operating frequency of the compressor is less than a lower limit of the predetermined frequency range.
In other embodiments, the operating frequency of the compressor is decreased in the event that the operating frequency of the compressor is greater than an upper limit of the predetermined frequency range.
For example, the predetermined frequency range is [ x1, y1 ]. If the operating frequency of the compressor is less than x1, the operating frequency is raised by means of compressor raising or the like so that the operating frequency falls within the predetermined frequency range x1, y 1. If the operating frequency is greater than y1, the operating frequency is reduced by the compressor down-clocking so that the operating frequency falls within the predetermined frequency range x1, y 1.
Returning to fig. 4. In step 404, a pressure parameter of the compressor is detected as a first parameter value.
In some embodiments, the pressure parameter is a discharge pressure or a suction pressure of the compressor.
In step 405, a cylinder switching operation is performed on the compressor.
In step 406, the pressure parameter of the compressor is sensed again as a second parameter value after a predetermined time.
In step 407, a rate of change of the pressure parameter is calculated based on the first parameter value and the second parameter value.
In step 408, in the event that the rate of change of the pressure parameter is greater than a predetermined threshold, it is determined that the cylinder switch of the compressor was successful.
Fig. 6 is an exemplary block diagram of a compressor cylinder switching detection device according to an embodiment of the present disclosure. As shown in fig. 6, the compressor cylinder switching detection means includes a steady state detection module 61, a rate detection module 62, and a cylinder switching module 63.
The steady state detection module 61 is configured to detect whether the suction pressure and discharge pressure of the compressor are in steady state.
In some embodiments, the suction pressures PT1 and PT2 of the compressor are respectively detected at predetermined time intervals T, and it is determined that the suction pressure of the compressor is in a steady state if the suction pressure change rate Δ P | PT2-PT1|/T is less than a predetermined threshold.
Accordingly, discharge pressures PT3 and PT4 of the compressor are respectively detected at predetermined time intervals T, and it is determined that the discharge pressure of the compressor is in a steady state if a discharge pressure change rate Δ P | PT4-PT3|/T is less than a predetermined threshold.
The rate detection module 62 is configured to detect a pressure parameter of the compressor as a first parameter value in a case where a suction pressure and a discharge pressure of the compressor are in a steady state; after the cylinder body switching module performs cylinder body switching operation on the compressor, detecting the pressure parameter of the compressor again after a preset time to serve as a second parameter value; and calculating the change rate of the pressure parameter according to the first parameter value and the second parameter value, and determining that the cylinder body of the compressor is successfully switched under the condition that the change rate of the pressure parameter is greater than a preset threshold.
In some embodiments, the pressure parameter is a discharge pressure or a suction pressure of the compressor.
The cylinder switching module 63 is configured to perform a cylinder switching operation on the compressor.
In some embodiments, the compressor may be switched from single cylinder to double cylinder or with additional cylinders. In other embodiments, the compressor may be switched from a dual cylinder to a single cylinder or a reduced cylinder. The compressor may be a multi-rotor compressor, and each compression cylinder of the compressor may be a cylinder of equal volume or a cylinder of unequal volume.
In the compressor cylinder switching detection device provided by the above embodiment of the present disclosure, whether the compressor successfully completes the cylinder switching can be conveniently determined by using the pressure parameter change rate of the compressor before and after the cylinder switching. Therefore, the control can be carried out according to the actual running state of the compressor, so that the performance of the compressor can be optimized.
Fig. 7 is an exemplary block diagram of a compressor cylinder switching detection device according to another embodiment of the present disclosure. Fig. 7 differs from fig. 6 in that, in the embodiment shown in fig. 7, a differential pressure adjustment module 64 is further included.
The pressure difference adjustment module 64 is configured to adjust the difference between the discharge pressure and the suction pressure of the compressor to within a predetermined pressure difference range before the steady state detection module 61 detects whether the suction pressure and the discharge pressure of the compressor are in a steady state.
By adjusting the difference between the discharge pressure and the suction pressure of the compressor to be within a predetermined differential pressure range, the accuracy of cylinder switching detection can be facilitated.
In some embodiments, the pressure differential adjustment module 64 is configured to detect a discharge pressure and a suction pressure of the compressor, and in the event that a difference between the discharge pressure and the suction pressure of the compressor is not within a predetermined pressure differential range, pressure adjust the compressor to control the difference between the discharge pressure and the suction pressure of the compressor within the predetermined pressure differential range.
In some embodiments, the pressure differential adjustment module 64 is further configured to make a first adjustment to the compressor to increase the difference between the discharge pressure and the suction pressure of the compressor if the difference between the discharge pressure and the suction pressure of the compressor is less than a lower limit of the predetermined pressure differential range. For example, the first adjustment includes raising the operating frequency of the compressor.
In other embodiments, the pressure differential adjustment module 64 is further configured to make a second adjustment to the compressor to reduce the difference between the discharge pressure and the suction pressure of the compressor if the difference between the discharge pressure and the suction pressure of the compressor is greater than the upper limit of the predetermined pressure differential range. For example, the second adjustment includes reducing the operating frequency of the compressor. In addition, the second adjustment may further include adjusting the suction-exhaust bypass mechanism to allow for pressure relief.
As shown in fig. 7, the compressor cylinder switching detection device further includes a frequency adjustment module 65.
The frequency adjustment module 65 is configured to adjust the operating frequency of the compressor to within a predetermined frequency range in a case where the suction pressure and the discharge pressure of the compressor are in a steady state, and then instruct the rate detection module 62 to perform an operation of detecting a pressure parameter of the compressor.
By adjusting the operating frequency of the compressor to within a predetermined frequency range, the accuracy of cylinder switching detection can be facilitated.
In some embodiments, the frequency adjustment module 65 is configured to detect an operating frequency of the compressor and, in the event that the operating frequency of the compressor is not within a predetermined frequency range, perform a frequency adjustment of the compressor to control the operating frequency of the compressor within the predetermined frequency range.
For example, the frequency adjustment module 65 is configured to increase the operating frequency of the compressor if the operating frequency of the compressor is less than a lower limit of the predetermined frequency range. For another example, the frequency adjustment module 65 is further configured to decrease the operating frequency of the compressor if the operating frequency of the compressor is greater than an upper limit of the predetermined frequency range.
Fig. 8 is an exemplary block diagram of a compressor cylinder switching detecting device according to still another embodiment of the present disclosure. As shown in fig. 8, the compressor cylinder switching detection means includes a memory 81 and a processor 82.
The memory 81 is used for storing instructions, the processor 82 is coupled to the memory 81, and the processor 82 is configured to execute the method according to any one of fig. 1 to 5 based on the instructions stored in the memory.
As shown in fig. 8, the switching detection device of the compressor cylinder further includes a communication interface 83 for information interaction with other devices. Meanwhile, the device also comprises a bus 84, and the processor 82, the communication interface 83 and the memory 81 are communicated with each other through the bus 84.
The memory 81 may include a high-speed RAM memory, and may further include a non-volatile memory (e.g., at least one disk memory). The memory 81 may also be a memory array. The storage 81 may also be partitioned and the blocks may be combined into virtual volumes according to certain rules.
Further, the processor 82 may be a central processing unit CPU, or may be an application specific integrated circuit ASIC, or one or more integrated circuits configured to implement embodiments of the present disclosure.
The present disclosure also relates to a computer-readable storage medium, wherein the computer-readable storage medium stores computer instructions, and the instructions, when executed by a processor, implement a method according to any one of fig. 1 to 5.
The present disclosure also provides an air conditioner including a compressor cylinder switching detection device according to any one of the embodiments shown in fig. 6 to 8.
In some embodiments, the functional unit modules described above may be implemented as a general purpose Processor, a Programmable Logic Controller (PLC), a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable Logic device, discrete gate or transistor Logic, discrete hardware components, or any suitable combination thereof for performing the functions described in this disclosure.
It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware, where the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.
The description of the present disclosure has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the disclosure in the form disclosed. Many modifications and variations will be apparent to practitioners skilled in this art. The embodiment was chosen and described in order to best explain the principles of the disclosure and the practical application, and to enable others of ordinary skill in the art to understand the disclosure for various embodiments with various modifications as are suited to the particular use contemplated.

Claims (27)

1. A method for detecting switching of a compressor cylinder body comprises the following steps:
adjusting the difference between the discharge pressure and the suction pressure of the compressor to be within a preset pressure difference range;
detecting whether the suction pressure and the discharge pressure of the compressor are in a steady state;
detecting a pressure parameter of the compressor as a first parameter value under the condition that the suction pressure and the discharge pressure of the compressor are in a steady state;
performing cylinder switching operation on the compressor;
detecting the pressure parameter of the compressor again after a preset time as a second parameter value;
calculating the change rate of the pressure parameter according to the first parameter value and the second parameter value;
and determining that the cylinder body of the compressor is successfully switched under the condition that the change rate of the pressure parameter is greater than a preset threshold.
2. The method of claim 1, wherein,
the pressure parameter is a discharge pressure or a suction pressure of the compressor.
3. The method of claim 1, wherein adjusting a difference between a discharge pressure and a suction pressure of the compressor to within a predetermined pressure differential range comprises:
detecting the discharge pressure and the suction pressure of the compressor;
and in the case that the difference between the discharge pressure and the suction pressure of the compressor is not within the preset pressure difference range, performing pressure regulation on the compressor so as to control the difference between the discharge pressure and the suction pressure of the compressor within the preset pressure difference range.
4. The method of claim 3, wherein pressure regulating the compressor comprises:
and under the condition that the difference between the discharge pressure and the suction pressure of the compressor is smaller than the lower limit of the preset pressure difference range, performing first adjustment on the compressor to increase the difference between the discharge pressure and the suction pressure of the compressor.
5. The method of claim 4, wherein the first adjusting comprises:
and increasing the working frequency of the compressor.
6. The method of claim 4, further comprising:
and under the condition that the difference between the discharge pressure and the suction pressure of the compressor is larger than the upper limit of the preset pressure difference range, performing second adjustment on the compressor to reduce the difference between the discharge pressure and the suction pressure of the compressor.
7. The method of claim 6, wherein the second adjusting comprises:
reducing the operating frequency of the compressor.
8. The method of claim 7, wherein the second adjusting further comprises:
and adjusting the air suction and exhaust bypass mechanism to release pressure.
9. The method of any of claims 1-8, wherein, with the suction and discharge pressures of the compressor at steady state, further comprising:
adjusting the operating frequency of the compressor to be within a predetermined frequency range, and then performing the step of detecting the pressure parameter of the compressor.
10. The method of claim 9, wherein adjusting the operating frequency of the compressor to be within a predetermined frequency range comprises:
detecting the working frequency of the compressor;
and in the case that the working frequency of the compressor is not in the preset frequency range, performing frequency adjustment on the compressor so as to control the working frequency of the compressor to be in the preset frequency range.
11. The method of claim 10, wherein frequency adjusting the compressor comprises:
and under the condition that the working frequency of the compressor is less than the lower limit of the preset frequency range, increasing the working frequency of the compressor.
12. The method of claim 11, further comprising:
and reducing the working frequency of the compressor under the condition that the working frequency of the compressor is greater than the upper limit of the preset frequency range.
13. A compressor cylinder switching detection device includes:
a pressure difference adjustment module configured to adjust a difference between a discharge pressure and a suction pressure of the compressor to be within a predetermined pressure difference range;
a steady state detection module configured to detect whether a suction pressure and a discharge pressure of the compressor are in a steady state;
the speed detection module is configured to detect a pressure parameter of the compressor as a first parameter value under the condition that the suction pressure and the discharge pressure of the compressor are in a steady state; after the cylinder body switching module performs cylinder body switching operation on the compressor, detecting the pressure parameter of the compressor again after a preset time as a second parameter value; calculating the change rate of the pressure parameter according to the first parameter value and the second parameter value, and determining that the cylinder body of the compressor is successfully switched under the condition that the change rate of the pressure parameter is greater than a preset threshold;
a cylinder switching module configured to perform a cylinder switching operation on the compressor.
14. The apparatus of claim 13, wherein,
the pressure parameter is a discharge pressure or a suction pressure of the compressor.
15. The apparatus of claim 13, wherein,
the pressure difference adjusting module is configured to detect a discharge pressure and a suction pressure of the compressor, and perform pressure adjustment on the compressor to control a difference between the discharge pressure and the suction pressure of the compressor within the predetermined pressure difference range if the difference between the discharge pressure and the suction pressure of the compressor is not within the predetermined pressure difference range.
16. The apparatus of claim 15, wherein,
the pressure difference adjustment module is further configured to perform a first adjustment on the compressor to increase a difference between a discharge pressure and a suction pressure of the compressor if a difference between the discharge pressure and the suction pressure of the compressor is less than a lower limit of the predetermined pressure difference range.
17. The apparatus of claim 16, wherein the first adjustment comprises:
and increasing the working frequency of the compressor.
18. The apparatus of claim 15, wherein,
the pressure differential adjustment module is further configured to make a second adjustment to the compressor to reduce a difference between a discharge pressure and a suction pressure of the compressor if the difference between the discharge pressure and the suction pressure of the compressor is greater than an upper limit of the predetermined pressure differential range.
19. The apparatus of claim 18, wherein the second adjustment comprises:
reducing the operating frequency of the compressor.
20. The apparatus of claim 19, wherein the second adjustment further comprises:
and adjusting the air suction and exhaust bypass mechanism to release pressure.
21. The apparatus of any of claims 13-20, further comprising:
and the frequency adjusting module is configured to adjust the working frequency of the compressor to be within a preset frequency range under the condition that the suction pressure and the discharge pressure of the compressor are in a steady state, and then instruct the speed detecting module to perform the operation of detecting the pressure parameter of the compressor.
22. The apparatus of claim 21, wherein,
the frequency adjustment module is configured to detect an operating frequency of the compressor, and perform frequency adjustment on the compressor to control the operating frequency of the compressor within the predetermined frequency range if the operating frequency of the compressor is not within the predetermined frequency range.
23. The apparatus of claim 22, wherein,
the frequency adjustment module is configured to increase the operating frequency of the compressor if the operating frequency of the compressor is less than a lower limit of the predetermined frequency range.
24. The apparatus of claim 23, wherein,
the frequency adjustment module is further configured to decrease the operating frequency of the compressor if the operating frequency of the compressor is greater than an upper limit of the predetermined frequency range.
25. A compressor cylinder switching detection device includes:
a memory configured to store instructions;
a processor coupled to the memory, the processor configured to perform implementing the method of any of claims 1-12 based on instructions stored by the memory.
26. An air conditioner comprising a compressor cylinder switching detection device as claimed in any one of claims 13 to 25.
27. A computer-readable storage medium, wherein the computer-readable storage medium stores computer instructions which, when executed by a processor, implement the method of any one of claims 1-12.
CN201811219699.5A 2018-10-19 2018-10-19 Compressor cylinder body switching detection method and device and air conditioner Active CN109357452B (en)

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