CN109297155B - Compressor protection method and device and air conditioner - Google Patents
Compressor protection method and device and air conditioner Download PDFInfo
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- CN109297155B CN109297155B CN201811443436.2A CN201811443436A CN109297155B CN 109297155 B CN109297155 B CN 109297155B CN 201811443436 A CN201811443436 A CN 201811443436A CN 109297155 B CN109297155 B CN 109297155B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
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Abstract
The invention provides a compressor protection method and device and an air conditioner, and relates to the technical field of air conditioners. The compressor protection method and the device can be applied to an air conditioner, and the compressor protection method comprises the following steps: when each compressor is in an operating state, acquiring operating state parameters of each compressor; judging whether the pressures of the plurality of compressors are unbalanced or not according to the operating state parameters of each compressor; when the pressure imbalance among the plurality of compressors is determined, the operation states of the plurality of compressors are controlled. Compared with the prior art, the method and the device have the advantages that the running state parameters of each compressor are obtained, whether the plurality of compressors are in the running state with unbalanced pressure or not is judged, and meanwhile, the running states of the plurality of compressors are controlled when the plurality of compressors are in the running state with unbalanced pressure, so that the damage to the compressors caused by running in the state with unbalanced pressure can be effectively avoided.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a compressor protection method and device and an air conditioner.
Background
The safety protection control of the refrigeration compressor is a necessary condition for ensuring the safe operation of the air conditioner, and the common compressor protection method is to perform protection control on a single compressor according to parameters such as current, temperature and the like of the single compressor.
However, in the existing compressor with larger cooling capacity, a multi-compressor parallel connection mode is generally adopted to realize high-power refrigeration of a single unit, and due to the influence of factors such as differences among compressors and differences among pipelines, pressure imbalance is easy to occur among the compressors, and if the existing method is adopted to protect a single compressor, the compressor is possibly abraded and even damaged.
Disclosure of Invention
The invention solves the problem that when a plurality of compressors are connected in parallel, the existing compressor protection method can not protect the pressure imbalance among the compressors.
In order to solve the above problems, the present invention provides a method for protecting a compressor, which is applied to an air conditioner including a plurality of compressors, the method for protecting the compressor including: when each compressor is in an operating state, acquiring operating state parameters of each compressor; judging whether the pressures among the plurality of compressors are unbalanced or not according to the operating state parameters of each compressor; and controlling the operation states of the plurality of compressors when the pressure imbalance among the plurality of compressors is determined.
Compared with the prior art, the compressor protection method has the following advantages: the method comprises the steps of judging whether the plurality of compressors are in an unbalanced pressure operation state or not by obtaining the operation state parameters of each compressor, and controlling the operation states of the plurality of compressors when the plurality of compressors are in the unbalanced pressure operation state, so that damage to the compressors caused by operation in the unbalanced pressure state can be effectively avoided.
Further, when the plurality of compressors are two compressors, each compressor corresponds to one acquisition unit, and the operation state parameters comprise exhaust pressure and input current; the step of obtaining the operating condition parameters of each compressor when each compressor is in an operating condition includes: and when the operating frequency of each compressor reaches a first frequency, acquiring the exhaust pressure and the input current acquired by the acquisition unit corresponding to each compressor. Therefore, when the two compressors are connected in parallel and operated at the same frequency, the two compressors should be in an operating state of the same load, and the discharge pressure and the input current of the two compressors should be within the same numerical range, so that the accuracy of subsequent judgment can be improved by detecting the discharge pressure and the input current of each compressor.
Further, the step of determining whether the pressures of the plurality of compressors are unbalanced according to the operating state parameter of each compressor includes: calculating a pressure difference value and a current difference value between the two compressors according to the exhaust pressure and the input current of each compressor; and when the pressure difference value and the current difference value meet a pressure imbalance condition, judging that the pressure between the two compressors is unbalanced. Therefore, whether the pressure between the two compressors is unbalanced or not can be accurately judged through the pressure difference value and the current difference value between the two compressors.
Further, the pressure imbalance condition includes: the pressure difference value is continuously greater than a first preset pressure value within a first preset time, and the current difference value is continuously greater than a first preset current value; or the pressure difference value in the second preset time is continuously greater than the second preset pressure value; or the current difference value in the second preset time is continuously larger than the second preset current value. Therefore, the judgment of the pressure unbalance can be more perfect.
Further, the step of controlling the operation states of the plurality of compressors when it is determined that the pressures are unbalanced among the plurality of compressors includes: when the pressure between the two compressors is judged to be unbalanced, limiting the operating frequency of each compressor so as to ensure that the operating frequency of each compressor does not exceed a second frequency; after the operation frequency is limited, if the operation state parameters of the two compressors are detected to meet the pressure balance condition, the pressure between the two compressors is judged to be restored to balance, and the limitation on the operation frequency is removed; if the operating state parameters of the two compressors are detected to meet the pressure imbalance condition, judging that the pressure between the two compressors is still unbalanced, and restarting the air conditioner; and detecting the restarting times of the air conditioner, and if the restarting times reach the preset times within the preset time, stopping the air conditioner. Therefore, corresponding protective measures are acquired aiming at the pressure imbalance between the two compressors, and the damage to the compressors is avoided.
Further, the pressure equalization condition includes: and in a third preset time, the pressure difference value is continuously smaller than a third preset pressure value, and the current difference value is continuously smaller than a third preset current value. Therefore, when the pressure between the two compressors is restored to be balanced, the limitation on the operation frequency is removed, and the effective refrigeration of the air conditioner is ensured.
Further, the first preset time is 10-20 min, the first preset pressure value is 0.4-0.6 Mpa, and the first preset current value is 4-6A; and/or the second preset time is 15-25 min, the second preset pressure value is 0.7-0.9 MPa, and the second preset current value is 6-8A; and/or the third preset time is 15-25 min, the third preset pressure value is 0.1-0.3 Mpa, and the third preset current value is 1-3A; and/or the preset time is 2.5-3.5 hours, and the preset times are 2-4 times.
Further, when the plurality of compressors includes at least three compressors, each compressor corresponds to one acquisition unit, and the operation state parameter includes a discharge pressure; the step of obtaining the operating condition parameters of each compressor when each compressor is in an operating condition includes: and when each compressor is in the running state, acquiring the exhaust pressure acquired by the acquisition unit corresponding to each compressor. Thus, when a plurality of compressors are connected in parallel, the accuracy of the subsequent judgment can be improved by detecting the discharge pressure of each compressor.
Further, the step of determining whether the pressures of the plurality of compressors are unbalanced according to the operating state parameter of each compressor includes: calculating the average pressure values of the plurality of compressors according to the exhaust pressure of each compressor; comparing the discharge pressure of each compressor with the average pressure value in sequence; and if the pressure difference value between the exhaust pressure of the target compressor and the average pressure value is continuously greater than the preset pressure value in the preset time, judging that the pressure between the target compressor and other compressors is unbalanced. Therefore, the pressure imbalance between the compressor and other compressors can be accurately judged.
Further, the step of controlling the operation states of the plurality of compressors when it is determined that the pressures are unbalanced among the plurality of compressors includes: and when the pressure imbalance between the target compressor and other compressors is judged, stopping the target compressor. Therefore, the target compressor with unbalanced pressure with other compressors is stopped, and damage to the compressor can be effectively avoided.
In order to solve the above problems, the present invention provides a compressor protection device applied to an air conditioner, wherein the air conditioner includes a plurality of compressors, and the compressor protection device includes: the acquisition module is used for acquiring the operating state parameters of each compressor when each compressor is in an operating state; the judging module is used for judging whether the pressure among the plurality of compressors is unbalanced or not according to the operating state parameter of each compressor; and the control module is used for controlling the running states of the plurality of compressors when the pressure among the plurality of compressors is determined to be unbalanced. The compressor protection device and the compressor protection method have the same advantages compared with the prior art, and are not described in detail herein.
In order to solve the above problems, the present invention provides an air conditioner, the air conditioner including a plurality of compressors, the air conditioner further including: one or more controllers; a memory for storing one or more programs that, when executed by the one or more controllers, cause the one or more controllers to implement the compressor protection methods described above. Compared with the prior art, the air conditioner and the compressor protection method have the same advantages, and the description is omitted.
Drawings
Fig. 1 is a block diagram of a circuit structure of an air conditioner according to an embodiment of the present invention.
Fig. 2 is a flowchart illustrating steps of a method for protecting a compressor according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of a first application example of the compressor protection method according to the embodiment of the invention.
Fig. 4 is a schematic diagram of a second application example of the compressor protection method according to the embodiment of the invention.
Fig. 5 is a schematic view of a compressor protection device according to an embodiment of the present invention.
Description of reference numerals:
100-air conditioner, 101-acquisition unit, 102-compressor, 103-memory, 104-controller, 200-compressor protection device, 201-acquisition module, 202-judgment module and 203-control module.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
The present invention provides an air conditioner 100 that can protect the compressors when there is an imbalance of pressure between the compressors. Referring to fig. 1, fig. 1 is a circuit block diagram of an air conditioner 100 according to an embodiment of the invention. The air conditioner 100 includes: a plurality of acquisition units 101, a plurality of compressors 102, a memory 103, a controller 104, and a compressor protection device 200. The controller 104 is electrically connected to the plurality of collecting units 101, the plurality of compressors 102, and the memory 103. The compressor protection device 200 includes at least one software function module that can be stored in the memory 103 in the form of software or firmware (firmware).
The memory 103 may be used to store software programs and units, such as program instruction units corresponding to the compressor protection device 200 in the embodiment of the present invention, and the controller 104 executes various functional applications and data processing, such as the compressor protection method provided in the embodiment of the present invention, by executing the software programs and units of the compressor protection device 200 stored in the memory 103.
The Memory 103 may be, but is not limited to, a Random Access Memory (RAM), a Read Only Memory (ROM), a Programmable Read-Only Memory (PROM), an Erasable Read-Only Memory (EPROM), an electrically Erasable Read-Only Memory (EEPROM), and the like.
The above-mentioned multiple collecting units 101 correspond to the multiple compressors 102 one by one, and each collecting unit 101 is used for collecting the operating state parameters of the compressor 102 corresponding to the collecting unit 101, and the following description is given by using a single collecting unit 101. When the air conditioner 100 includes two compressors 102, the collecting unit 101 may be a pressure sensor and a compressor driving plate, the pressure sensor may be disposed at an exhaust port of the compressor 102 for collecting an exhaust pressure of the compressor 102, and the compressor driving plate is disposed on the controller 104 for collecting an input current of the compressor 102; when the air conditioner 100 includes at least three compressors 102, the collecting unit 101 may be a pressure sensor, which may be disposed at an exhaust port of the compressor 102, for collecting an exhaust pressure of the compressor 102.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
First embodiment
Referring to fig. 2, an embodiment of the invention provides a method for protecting a compressor. The compressor protection method may be applied to the air conditioner 100. As shown in fig. 2, the above-mentioned compressor protection method may include the steps of:
and step S101, when each compressor is in the running state, obtaining the running state parameters of each compressor.
In the embodiment of the present invention, the operation state parameter refers to a parameter that changes with the operation of the compressor 102, and may represent or affect the operation condition of the compressor 102, and the operation state parameter may be the discharge pressure, the input current, and the like of the compressor 102. The air conditioner 100 may include two compressors 102, or may include at least three compressors 102.
As an embodiment, when the air conditioner 100 includes two compressors 102, the operation state parameter of each compressor 102 includes a discharge pressure and an input current, and at this time, the process of obtaining the operation state parameter of each compressor 102 may be: when the operating frequency of each compressor 102 reaches the first frequency, the discharge pressure and the input current acquired by the acquisition unit 101 corresponding to each compressor 102 are acquired. That is, when the two compressors 102 are simultaneously operated and the operation frequency reaches the first frequency, the acquisition unit 101 corresponding to each compressor 102 is controlled to start acquiring the discharge voltage and the input current.
Alternatively, the first frequency may be a frequency corresponding to 70% of the compressor capacityThe discharge pressures of the two compressors 102 are respectively represented by H1、H2The input currents of the two compressors 102 are respectively represented by I1、I2And (4) showing.
As another embodiment, when the plurality of compressors 102 includes at least three compressors 102, the operation state parameter of each compressor 102 is a discharge pressure, and in this case, the process of obtaining the operation state parameter of each compressor 102 may be: when each compressor 102 is in an operating state, the discharge pressure collected by the collecting unit 101 corresponding to each compressor 102 is obtained. Alternatively, the discharge pressure of each compressor 102 may be HnWhere n denotes the serial number of the compressor 102, and n is 1,2, ….
Step S102, judging whether the pressures among the plurality of compressors are unbalanced or not according to the operating state parameters of each compressor.
As an embodiment, when the air conditioner 100 includes two compressors 102, the two compressors 102 are connected in parallel, and the operation frequency of each compressor 102 reaches the first frequency, the two compressors 102 should be in the same load operation state, that is, the discharge pressure and the input current of the two compressors 102 should be in the same value range. Based on this, the process of determining whether there is a pressure imbalance between the two compressors 102 may be:
first, a pressure difference value and a current difference value between the two compressors 102 are calculated based on a discharge pressure and an input current of each compressor 102, that is, a discharge pressure H based on the two compressors 1021、H2And an input current I1、I2The pressure difference | H between the two compressors 102 is calculated1-H2I and the current difference I1-I2|；
Secondly, when the pressure difference value and the current difference value satisfy a pressure imbalance condition, it is determined that the pressure between the two compressors 102 is unbalanced, and the pressure imbalance condition includes: the pressure difference value is continuously greater than a first preset pressure value in a first preset time, and the current difference value is continuously greater than a first preset current value; or the pressure difference value in the second preset time is continuously greater than the second preset pressureForce values; or the current difference value in the second preset time is continuously larger than the second preset current value. That is, when the pressure difference | H is detected for the first preset time1-H2|>p1 and current difference | I1-I2|>i1, judging the pressure imbalance between the two compressors 102; when the pressure difference | H is detected for the second preset time1-H2|>p2, determining the pressure imbalance between the two compressors 102; when the current difference I is detected for the second preset time1-I2|>i2, determining a pressure imbalance between the two compressors 102.
Optionally, the value range of the first preset time may be 10-20 min, for example, 15 min; the value range of the second preset time can be 15-25 min, such as 20 min; the value range of the first preset pressure value can be 0.4-0.6 Mpa, such as 0.5 Mpa; the value range of the second preset pressure value can be 0.7-0.9 Mpa, such as 0.8 Mpa; the value range of the first preset current value can be 4-6A, such as 5A; the value range of the second preset current value can be 6-8A, such as 7A.
As another embodiment, when the plurality of compressors 102 includes at least three compressors 102, the step of sequentially comparing the discharge pressure of each compressor 102 with the average pressure of the at least three compressors 102 connected in parallel to find a target compressor out of the at least three compressors 102 that is unbalanced in pressure with other compressors may include:
first, an average pressure value of the plurality of compressors 102 is calculated according to the discharge pressure of each compressor 102, and the average pressure value can be represented by HpThe mean pressure value can be expressed by the formula
Calculating;
the discharge pressure H of each compressor 102 is then adjustednIn turn with the average pressure value HpCarrying out comparison;
finally, if the discharge pressure H of the target compressor isnAnd the average pressure value HpIf the pressure difference value is continuously greater than the preset pressure value within the preset time, the pressure imbalance between the target compressor and other compressors is judged. That is, when the pressure difference | H is detected for a preset timen-Hp|>p, the pressure imbalance between the target compressor n and the other compressors is determined. Optionally, the value range of the preset time may be 10-20 min, for example, 15 min; the value range of the preset pressure value can be 0.4-0.6 MPa, such as 0.5 MPa.
It should be noted that, of the at least three compressors 102, the compressors 102 with pressure imbalances with other compressors are all called target compressors, and once the discharge pressure H of one of the compressors 102 is detectednThe continuous preset time satisfies | Hn-Hp|>p, the compressor 102 is designated as a target compressor, and therefore the number of target compressors is at least 1, and for example, the air conditioner 100 includes a 1# compressor, a 2# compressor, a 3# compressor, and a 4# compressor, and if both the 1# compressor and the 2# compressor satisfy the above conditions, both the 1# compressor and the 2# compressor are the target compressors.
And step S103, when the pressure among the plurality of compressors is determined to be unbalanced, controlling the operation states of the plurality of compressors.
As an embodiment, when the air conditioner 100 includes two compressors 102, when it is determined that the pressure between the two compressors 102 is unbalanced, the operation state of the two compressors 102 is controlled, and the specific process may include:
first, the operating frequency of each compressor 102 is limited such that the operating frequency of each compressor 102 does not exceed the second frequency. Alternatively, the second frequency may be a frequency corresponding to 60% of the compressor capacity;
then, after limiting the operation frequency, the operation state parameters of the two compressors 102 are continuously detected, and the specific detection process may include:
first, if it is detected that the operating state parameters of the two compressors 102 satisfy the pressure balance condition, it is determined that the pressures of the two compressors 102 are restored to balance, at this time, the limitation on the operating frequencies of the two compressors 102 is removed, and then, subsequently, the pressure balance condition is satisfiedSteps S101 to S103 are continuously performed. The pressure balance conditions include: and in a third preset time, the pressure difference value is continuously smaller than a third preset pressure value, and the current difference value is continuously smaller than a third preset current value. That is, when the pressure difference | H is detected for the third preset time1-H2|<p3 and current difference | I1-I2|<i3, it is determined that the pressures of the two compressors 102 are restored to equilibrium. Optionally, the value range of the third preset time may be 15-25 min, for example, 20 min; the value range of the third preset pressure value can be 0.1-0.3 Mpa, such as 0.2 Mpa; the value range of the third preset current value can be 1-3A, such as 2A;
secondly, if it is detected that the operating state parameters of the two compressors 102 satisfy the pressure imbalance condition, it is determined that the pressure between the two compressors 102 is still imbalanced, the air conditioner 100 is restarted, and the restarting may be performed after the air conditioner 100 is stopped for a period of time (e.g., 5min), and then the steps S101 to S103 are continuously performed. That is, when the pressure difference | H is detected for the first preset time1-H2|>p1 and current difference | I1-I2|>i1, determining that the pressure between the two compressors 102 is still unbalanced, and restarting the air conditioner 100 after stopping for a period of time (for example, 5 min); when the pressure difference | H is detected for the second preset time1-H2|>p2, determining that the pressure between the two compressors 102 is still unbalanced, and restarting the air conditioner 100 after stopping for a period of time (e.g., 5 min); when the current difference I is detected for the second preset time1-I2|>i2, the pressure between the two compressors 102 is determined to be still unbalanced, and the air conditioner 100 is restarted after being stopped for a certain period of time (e.g., 5 min).
And finally, detecting the restarting times of the air conditioner 100, and if the restarting times reach the preset times within the preset duration, stopping the air conditioner 100. The restart times herein refer to the number of restarts due to the pressure imbalance between the two compressors 102, that is, when it is detected that the number of restarts due to the pressure imbalance between the two compressors 102 reaches a preset number within a preset time period, the air conditioner 100 is stopped and is not started again, and a fault code is displayed at the same time. Optionally, the value range of the preset duration may be 2.5 to 3.5 hours, for example, 3 hours; the value of the preset times can be 2-4 times, for example, 3 times.
As another embodiment, when the plurality of compressors 102 includes at least three compressors 102, when it is determined that the target compressor is not in balance with the other compressors, the target compressor is stopped, the other compressors are normally operated, and then steps S101 to S103 are continuously performed. For example, the air conditioner 100 includes a 1# compressor, a 2# compressor, a 3# compressor, and a 4# compressor, and if it is determined in step S102 that the 1# compressor and the 2# compressor are both target compressors, both the 1# compressor and the 2# compressor are stopped, and the 3# compressor and the 4# compressor are normally operated.
Further, for better explanation of the embodiment of the present invention, the following describes the embodiment of the present invention by using an application example as shown in fig. 3 and fig. 4, and as shown in fig. 3, when the air conditioner 100 includes two compressors 102, the method for protecting the compressors provided by the embodiment of the present invention is applied to the air conditioner 100, which may include the following processes:
s1, when the operating frequency of each compressor 102 reaches the first frequency, acquiring the discharge pressure and the input current acquired by the acquisition unit 101 corresponding to each compressor 102. Alternatively, the first frequency may be a frequency corresponding to 70% of the compressor capacity, and the discharge pressures of the two compressors 102 are respectively represented by H1、H2The input currents of the two compressors 102 are respectively represented by I1、I2And (4) showing.
S2, a pressure difference and a current difference between the two compressors 102 are calculated according to the discharge pressure and the input current of each compressor 102.
S3, when the pressure difference value and the current difference value satisfy the pressure imbalance condition, it is determined that the pressure is imbalanced between the two compressors 102. Pressure imbalance conditions include: the pressure difference value is continuously greater than the first preset pressure value in the first preset time, and the current difference value is continuously greater than the first preset current value, namely, | H1-H2|>p1 and | I1-I2|>i 1; or the pressure difference value in the second preset time is continuously larger than the second preset timePressure value, i.e., | H1-H2|>p 2; or the current difference value in the second preset time is continuously larger than the second preset current value, namely, | I1-I2|>i2. Optionally, the value range of the first preset time may be 10-20 min, for example, 15 min; the value range of the second preset time can be 15-25 min, such as 20 min; the value range of the first preset pressure value can be 0.4-0.6 Mpa, such as 0.5 Mpa; the value range of the second preset pressure value can be 0.7-0.9 Mpa, such as 0.8 Mpa; the value range of the first preset current value can be 4-6A, such as 5A; the value range of the second preset current value can be 6-8A, such as 7A.
S4, when it is determined that the pressures of the two compressors 102 are unbalanced, limiting the operating frequency of each compressor 102 such that the operating frequency of each compressor 102 does not exceed the second frequency. Alternatively, the second frequency may be a frequency corresponding to 60% of the compressor capacity.
S5, after limiting the operation frequency, if it is detected that the operation state parameters of the two compressors 102 satisfy the pressure balance condition, it is determined that the pressures of the two compressors 102 are restored to balance, and the limitation on the operation frequency is released. The pressure balance conditions include: the pressure difference value is continuously smaller than the third preset pressure value and the current difference value is continuously smaller than the third preset current value in the third preset time, namely, | H1-H2|<p3 and | I1-I2|<i3, it is determined that the pressures of the two compressors 102 are restored to equilibrium. Optionally, the value range of the third preset time may be 15-25 min, for example, 20 min; the value range of the third preset pressure value can be 0.1-0.3 Mpa, such as 0.2 Mpa; the value range of the third preset current value can be 1-3A, such as 2A;
s6, if it is detected that the operating state parameters of the two compressors 102 satisfy the pressure imbalance condition, it is determined that the pressure between the two compressors 102 is still imbalanced, and the air conditioner 100 is restarted. Alternatively, the restart may be a restart after the air conditioner 100 is stopped for a certain time (e.g., 5 min).
And S7, detecting the restarting times of the air conditioner 100, and if the restarting times reach the preset times within the preset duration, stopping the air conditioner 100. The restart times refer to the restart times caused by pressure imbalance between the two compressors 102, and optionally, the value range of the preset time may be 10-20 min, for example, 15 min; the value range of the preset pressure value can be 0.4-0.6 MPa, such as 0.5 MPa.
As shown in fig. 4, when the air conditioner 100 includes at least three compressors 102, the method for protecting the compressors according to the embodiment of the present invention is applied to the air conditioner 100, and may include the following steps:
s1', when each compressor 102 is in the operating state, the discharge pressure collected by the collection unit 101 corresponding to each compressor 102 is obtained. Alternatively, the discharge pressure of each compressor 102 may be HnWhere n denotes the serial number of the compressor 102, and n is 1,2, ….
S2', an average pressure value of the plurality of compressors 102 is calculated based on the discharge pressure of each compressor 102. Alternatively, the average pressure value may be HpThe mean pressure value can be expressed by the formula
Calculating;
s3', the discharge pressure of each compressor 102 is compared with the average pressure value in turn.
And S4', if the pressure difference value between the discharge pressure of the target compressor and the average pressure value is continuously greater than the preset pressure value within the preset time, determining that the pressure between the target compressor and other compressors is unbalanced. Optionally, the value range of the preset time may be 10-20 min, for example, 15 min; the value range of the preset pressure value can be 0.4-0.6 MPa, such as 0.5 MPa.
S5', when it is determined that the pressure is not balanced between the target compressor and the other compressors, the target compressor is stopped.
Second embodiment
Referring to fig. 5, a compressor protection device 200 is provided according to an embodiment of the present invention. The compressor protection device 200 described above may be applied to the air conditioner 100. As shown in fig. 5, the compressor protection device 200 may include: an acquisition module 201, a judgment module 202 and a control module 203.
An obtaining module 201, configured to obtain an operating state parameter of each compressor when each compressor is in an operating state.
In the embodiment of the present invention, the obtaining module 201 may be configured to execute step S101 in the first embodiment.
Optionally, when the plurality of compressors 102 is two compressors 102, each compressor 102 corresponds to one acquisition unit 101, and the operation state parameters include an exhaust pressure and an input current; the obtaining module 201 is specifically configured to: when the operating frequency of each compressor 102 reaches the first frequency, the discharge pressure and the input current acquired by the acquisition unit 101 corresponding to each compressor 102 are acquired.
Optionally, when the plurality of compressors 102 includes at least three compressors 102, each compressor 102 corresponds to one collecting unit 101, and the operation state parameter includes an exhaust pressure; the obtaining module 201 is specifically configured to: when each compressor 102 is in an operating state, the discharge pressure collected by the collecting unit 101 corresponding to each compressor 102 is obtained.
The determining module 202 is configured to determine whether pressure imbalance occurs among the plurality of compressors according to the operating state parameter of each compressor.
In this embodiment of the present invention, the determining module 202 may be configured to execute step S102 in the first embodiment.
Optionally, when the plurality of compressors 102 is two compressors 102, the determining module 202 is specifically configured to: calculating a pressure difference and a current difference between the two compressors 102 according to the discharge pressure and the input current of each compressor 102; when the pressure difference and the current difference satisfy the pressure imbalance condition, a pressure imbalance between the two compressors 102 is determined.
Further, the pressure imbalance condition includes: the pressure difference value is continuously greater than a first preset pressure value in a first preset time, and the current difference value is continuously greater than a first preset current value; or the pressure difference value in the second preset time is continuously greater than the second preset pressure value; or the current difference value in the second preset time is continuously larger than the second preset current value.
Further, the value range of the first preset time can be 10-20 min, for example, 15 min; the value range of the second preset time can be 15-25 min, such as 20 min; the value range of the first preset pressure value can be 0.4-0.6 Mpa, such as 0.5 Mpa; the value range of the second preset pressure value can be 0.7-0.9 Mpa, such as 0.8 Mpa; the value range of the first preset current value can be 4-6A, such as 5A; the value range of the second preset current value can be 6-8A, such as 7A.
Optionally, when the plurality of compressors 102 includes at least three compressors 102, the determining module 202 is specifically configured to: calculating an average pressure value of the plurality of compressors 102 according to the discharge pressure of each compressor 102; comparing the discharge pressure of each compressor 102 with the average pressure value in turn; and if the pressure difference value between the exhaust pressure of the target compressor and the average pressure value is continuously greater than the preset pressure value in the preset time, judging that the pressure between the target compressor and other compressors is unbalanced.
And the control module 203 is used for controlling the running states of the plurality of compressors when the pressure imbalance among the plurality of compressors is judged.
In the embodiment of the present invention, the control module 203 may be configured to execute step S103 in the first embodiment.
Optionally, when the plurality of compressors 102 is two compressors 102, the control module 203 is specifically configured to: when the pressure imbalance between the two compressors 102 is determined, limiting the operating frequency of each compressor 102 so that the operating frequency of each compressor 102 does not exceed the second frequency; after the operation frequency is limited, if the operation state parameters of the two compressors 102 are detected to meet the pressure balance condition, the pressure recovery balance between the two compressors 102 is judged, and the limitation on the operation frequency is removed; if the operating state parameters of the two compressors 102 are detected to meet the pressure imbalance condition, determining that the pressure between the two compressors 102 is still unbalanced, and restarting the air conditioner 100; and detecting the restarting times of the air conditioner 100, and if the restarting times reach the preset times within the preset duration, stopping the air conditioner 100.
Further, the pressure equalization conditions include: and in a third preset time, the pressure difference value is continuously smaller than a third preset pressure value, and the current difference value is continuously smaller than a third preset current value.
Further, the value range of the third preset time can be 15-25 min, for example, 20 min; the value range of the third preset pressure value can be 0.1-0.3 Mpa, such as 0.2 Mpa; the value range of the third preset current value can be 1-3A, such as 2A; the value range of the preset time can be 10-20 min, such as 15 min; the value range of the preset pressure value can be 0.4-0.6 MPa, such as 0.5 MPa.
Optionally, when the plurality of compressors 102 includes at least three compressors 102, the determining module 202 is specifically configured to: when the pressure imbalance between the target compressor and other compressors is determined, the target compressor is stopped.
It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working process of the compressor protection device 200 described above may refer to the corresponding process in the foregoing method embodiment, and is not described herein again.
In summary, the present invention provides a method and an apparatus for protecting a compressor and an air conditioner, where the method and the apparatus for protecting a compressor can be applied to an air conditioner, and the method for protecting a compressor includes: when each compressor is in an operating state, acquiring operating state parameters of each compressor; judging whether the pressures of the plurality of compressors are unbalanced or not according to the operating state parameters of each compressor; when the pressure imbalance among the plurality of compressors is determined, the operation states of the plurality of compressors are controlled. Compared with the prior art, the method and the device have the advantages that the running state parameters of each compressor are obtained, whether the plurality of compressors are in the running state with unbalanced pressure or not is judged, and meanwhile, the running states of the plurality of compressors are controlled when the plurality of compressors are in the running state with unbalanced pressure, so that the damage to the compressors caused by running in the state with unbalanced pressure can be effectively avoided.
References to first and second in embodiments of the invention are only used to distinguish one entity or operation from another entity or operation without necessarily requiring or implying any actual such relationship or order between such entities or operations.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (11)
1. A compressor protection method applied to an air conditioner (100), wherein the air conditioner (100) comprises a plurality of compressors (102), the compressor protection method comprising:
when each compressor (102) is in an operation state, acquiring an operation state parameter of each compressor (102);
judging whether the pressure among the plurality of compressors (102) is unbalanced or not according to the operating state parameter of each compressor (102);
controlling an operating state of the plurality of compressors (102) when a pressure imbalance among the plurality of compressors (102) is determined;
when the plurality of compressors (102) is two compressors (102), the step of controlling the operation state of the plurality of compressors (102) when the pressure imbalance among the plurality of compressors (102) is determined comprises:
when the pressure imbalance between the two compressors (102) is judged, limiting the operating frequency of each compressor (102) so that the operating frequency of each compressor (102) does not exceed a second frequency;
after the operation frequency is limited, if the operation state parameters of the two compressors (102) are detected to meet the pressure balance condition, the pressure between the two compressors (102) is judged to be restored to balance, and the limitation on the operation frequency is removed;
if the operating state parameters of the two compressors (102) are detected to meet the pressure imbalance condition, determining that the pressure between the two compressors (102) is still unbalanced, and restarting the air conditioner (100);
and detecting the restarting times of the air conditioner (100), and if the restarting times reach the preset times within the preset time, stopping the air conditioner (100).
2. The compressor protection method as claimed in claim 1, wherein when the plurality of compressors (102) is two compressors (102), each compressor (102) corresponds to one collecting unit (101), and the operation state parameters include a discharge pressure and an input current;
the step of obtaining the operating state parameter of each compressor (102) when each compressor (102) is in the operating state comprises the following steps:
when the operating frequency of each compressor (102) reaches a first frequency, the exhaust pressure and the input current acquired by the acquisition unit (101) corresponding to each compressor (102) are acquired.
3. A method for protecting a compressor as claimed in claim 2, wherein said step of determining whether a pressure imbalance among said plurality of compressors (102) is present based on an operating condition parameter of each compressor (102) comprises:
calculating a pressure difference and a current difference between the two compressors (102) according to the discharge pressure and the input current of each compressor (102);
determining a pressure imbalance between the two compressors (102) when the pressure difference value and the current difference value satisfy a pressure imbalance condition.
4. A method of protecting a compressor as set forth in claim 3, wherein said pressure imbalance condition includes:
the pressure difference value is continuously greater than a first preset pressure value within a first preset time, and the current difference value is continuously greater than a first preset current value;
or the pressure difference value in the second preset time is continuously greater than the second preset pressure value;
or the current difference value in the second preset time is continuously larger than the second preset current value.
5. The method of protecting a compressor of claim 4, wherein said pressure equalization condition comprises: and in a third preset time, the pressure difference value is continuously smaller than a third preset pressure value, and the current difference value is continuously smaller than a third preset current value.
6. The method for protecting a compressor according to claim 5, wherein the first predetermined time is 10 to 20min, the first predetermined pressure value is 0.4 to 0.6Mpa, and the first predetermined current value is 4 to 6A;
and/or the second preset time is 15-25 min, the second preset pressure value is 0.7-0.9 MPa, and the second preset current value is 6-8A;
and/or the third preset time is 15-25 min, the third preset pressure value is 0.1-0.3 Mpa, and the third preset current value is 1-3A;
and/or the preset time is 2.5-3.5 hours, and the preset times are 2-4 times.
7. A compressor protection method as claimed in claim 1, wherein when said plurality of compressors (102) comprises at least three compressors (102), each compressor (102) corresponds to one pickup unit (101), said operating condition parameter comprises a discharge pressure;
the step of obtaining the operating state parameter of each compressor (102) when each compressor (102) is in the operating state comprises the following steps:
when each compressor (102) is in an operating state, the exhaust pressure collected by the collecting unit (101) corresponding to each compressor (102) is obtained.
8. The compressor protection method as claimed in claim 7, wherein the step of determining whether the pressure is unbalanced among the plurality of compressors (102) according to the operation state parameter of each compressor (102) comprises:
calculating an average pressure value of the plurality of compressors (102) according to the discharge pressure of each compressor (102);
comparing the discharge pressure of each compressor (102) with the average pressure value in turn;
and if the pressure difference value between the exhaust pressure of the target compressor and the average pressure value is continuously greater than the preset pressure value in the preset time, judging that the pressure between the target compressor and other compressors is unbalanced.
9. The compressor protection method as claimed in claim 8, wherein the step of controlling the operation state of the plurality of compressors (102) when the pressure imbalance among the plurality of compressors (102) is determined comprises:
and when the pressure imbalance between the target compressor and other compressors is judged, stopping the target compressor.
10. A compressor protection device for an air conditioner (100), wherein the air conditioner (100) includes a plurality of compressors (102), and the compressor protection device (200) includes:
the acquisition module (201) is used for acquiring the operating state parameters of each compressor (102) when each compressor (102) is in the operating state;
the judging module (202) is used for judging whether the pressure among the plurality of compressors (102) is unbalanced or not according to the operating state parameter of each compressor (102);
a control module (203) for controlling the operating states of the plurality of compressors (102) when a pressure imbalance among the plurality of compressors (102) is determined;
when the plurality of compressors (102) is two compressors (102), the control module (203) is specifically configured to:
when the pressure imbalance between the two compressors (102) is judged, limiting the operating frequency of each compressor (102) so that the operating frequency of each compressor (102) does not exceed a second frequency;
after the operation frequency is limited, if the operation state parameters of the two compressors (102) are detected to meet the pressure balance condition, the pressure between the two compressors (102) is judged to be restored to balance, and the limitation on the operation frequency is removed;
if the operating state parameters of the two compressors (102) are detected to meet the pressure imbalance condition, determining that the pressure between the two compressors (102) is still unbalanced, and restarting the air conditioner (100);
and detecting the restarting times of the air conditioner (100), and if the restarting times reach the preset times within the preset time, stopping the air conditioner (100).
11. An air conditioner characterized in that the air conditioner (100) comprises a plurality of compressors (102), the air conditioner (100) further comprising:
one or more controllers (104);
a memory (103) for storing one or more programs that, when executed by the one or more controllers (104), cause the one or more controllers (104) to implement the compressor protection method of any of claims 1-9.
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| CN111102677B (en) * | 2019-12-16 | 2021-09-21 | 宁波奥克斯电气股份有限公司 | Control method and control system for load balance of double compressors and air conditioner |
| CN111503037B (en) * | 2020-03-30 | 2022-03-08 | 西安格睿能源动力科技有限公司 | Load balancing energy-saving method for parallel operation of multiple centrifugal air compressors |
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| CN104776659A (en) * | 2015-04-14 | 2015-07-15 | 四川长虹空调有限公司 | Multi-split air conditioner refrigerant balancing control method and air conditioning system for achieving same |
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