CN107940675B - Central air conditioning system, auxiliary machine starting self-diagnosis method and self-diagnosis device thereof - Google Patents
Central air conditioning system, auxiliary machine starting self-diagnosis method and self-diagnosis device thereof Download PDFInfo
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- CN107940675B CN107940675B CN201711164998.9A CN201711164998A CN107940675B CN 107940675 B CN107940675 B CN 107940675B CN 201711164998 A CN201711164998 A CN 201711164998A CN 107940675 B CN107940675 B CN 107940675B
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Abstract
The invention discloses a central air conditioning system and an auxiliary machine starting-up self-diagnosis method and a self-diagnosis device thereof, wherein the method comprises the following steps: when the central air conditioning system operates in a quick cooling start mode, controlling the cooling tower fan, the cooling pump and the freezing pump to operate at a preset maximum power frequency, and obtaining the current operating power of the cooling tower fan, the cooling pump and the freezing pump; obtaining historical maximum power of a cooling tower fan, a cooling pump and a freezing pump; calculating respective power offset rates according to the current operating frequency and the historical maximum power respectively corresponding to the cooling tower fan, the cooling pump and the freezing pump; and performing self-diagnosis on the corresponding cooling tower fan, cooling pump and freezing pump according to the power deviation rate of the cooling tower fan, the power deviation rate of the cooling pump and the power deviation rate of the freezing pump. Therefore, the states of the cooling tower fan, the cooling pump and the freezing pump can be effectively detected in the running process of the central air conditioner, the system is ensured to run in the optimal state, and the energy-saving effect is further achieved.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a starting-up self-diagnosis method of an auxiliary machine of a central air conditioning system, a starting-up self-diagnosis device of the auxiliary machine of the central air conditioning system and the central air conditioning system with the self-diagnosis device.
Background
The central air conditioning system mainly comprises a refrigerating host, an air conditioning water system and an air conditioning wind system, wherein the air conditioning water system comprises a chilled water system and a cooling water system. Power equipment such as a refrigerating pump, a cooling tower fan and a cooling pump are included in the refrigerating water system and the cooling water system, so that heat exchange with a refrigerating host is realized.
After the power equipment is successfully installed and debugged, the initial test operation is in a good state, and no large mechanical loss occurs, but after the equipment is operated for a period of time, the mechanical loss of the equipment is increased due to lubrication deterioration or impurities entering the bearing, and the mechanical efficiency of the equipment is affected. During operation of the central air conditioning system, if maintenance personnel do not check frequently, it is difficult to perceive that mechanical loss of the power plant occurs.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems in the above-described technology to some extent. Therefore, a first object of the present invention is to provide a method for self-diagnosing the start-up of an auxiliary machine of a central air conditioning system, which can effectively detect the states of a cooling tower fan, a cooling pump and a freezing pump during the operation of the central air conditioning system, and ensure that the system is operated in an optimal state, thereby achieving the energy-saving effect.
A second object of the invention is to propose a non-transitory computer readable storage medium.
The third object of the present invention is to provide an auxiliary machine startup self-diagnosis device of a central air conditioning system.
A fourth object of the present invention is to propose a central air conditioning system.
In order to achieve the above object, an auxiliary machine startup self-diagnosis method of a central air conditioning system provided by an embodiment of a first aspect of the present invention, the auxiliary machine including a cooling tower, a cooling pump and a freezing pump, a heat exchange flow path formed by the cooling tower and the cooling pump exchanging heat with a condenser in a main machine, and a heat exchange flow path formed by the freezing pump and a terminal unit exchanging heat with an evaporator in the main machine, the method includes the following steps: when the central air conditioning system operates in a quick cooling start mode, controlling a cooling tower fan, a cooling pump and a freezing pump to operate at a preset maximum power frequency, and acquiring the current operating power of the cooling tower fan, the cooling pump and the freezing pump; obtaining historical maximum power of the cooling tower fan, the cooling pump and the freezing pump; calculating a power deviation rate of the cooling tower fan according to the current running power of the cooling tower fan and the historical maximum power of the cooling tower fan, calculating a power deviation rate of the cooling pump according to the current running power of the cooling pump and the historical maximum power of the cooling pump, and calculating a power deviation rate of the freezing pump according to the current running power of the freezing pump and the historical maximum power of the freezing pump; and performing self-diagnosis on the corresponding cooling tower fan, cooling pump and freezing pump according to the power deviation rate of the cooling tower fan, the power deviation rate of the cooling pump and the power deviation rate of the freezing pump.
According to the auxiliary machine starting-up self-diagnosis method of the central air-conditioning system, when the central air-conditioning system operates in a quick cooling starting-up mode, the cooling tower fan, the cooling pump and the freezing pump are controlled to operate at a preset maximum power frequency, the current operating power of the cooling tower fan, the cooling pump and the freezing pump is obtained, and the historical maximum power of the cooling tower fan, the cooling pump and the freezing pump is obtained. Calculating the power deviation rate of the cooling tower fan according to the current running power of the cooling tower fan and the historical maximum power of the cooling tower fan, calculating the power deviation rate of the cooling pump according to the current running power of the cooling pump and the historical maximum power of the cooling pump, and calculating the power deviation rate of the freezing pump according to the current running power of the freezing pump and the historical maximum power of the freezing pump. And performing self-diagnosis on the corresponding cooling tower fan, cooling pump and freezing pump according to the power deviation rate of the cooling tower fan, the power deviation rate of the cooling pump and the power deviation rate of the freezing pump. Therefore, the method can effectively detect the states of the cooling tower fan, the cooling pump and the freezing pump in the running process of the central air conditioner, ensures that the system runs in the optimal state, and further plays a role in energy conservation.
In addition, the auxiliary machine startup self-diagnosis method of the central air-conditioning system provided by the embodiment of the invention can also have the following additional technical characteristics:
according to one embodiment of the present invention, the self-diagnosis of the respective cooling tower fan, cooling pump and freezing pump is performed according to the power deviation rate of the cooling tower fan, the power deviation rate of the cooling pump and the power deviation rate of the freezing pump, respectively, including: respectively judging the power deviation rate of the cooling tower fan, the power deviation rate of the cooling pump and the power deviation rate of the freezing pump; if the power deviation rate of the cooling tower fan, the power deviation rate of the cooling pump and the power deviation rate of the freezing pump are respectively more than or equal to 0 and less than a first preset value, judging that the cooling tower fan, the cooling pump and the freezing pump are respectively in a normal operation range; if the power deviation rate of the cooling tower fan, the power deviation rate of the cooling pump and the power deviation rate of the freezing pump are respectively larger than or equal to a first preset value and smaller than or equal to a second preset value, judging that the cooling tower fan, the cooling pump and the freezing pump are respectively required to be maintained; and if the power deviation rate of the cooling tower fan, the power deviation rate of the cooling pump and the power deviation rate of the freezing pump are respectively larger than a second preset value, judging that the cooling tower fan, the cooling pump and the freezing pump are respectively required to be checked and maintained.
According to one embodiment of the invention, the power deviation rate is calculated according to the following formula:
X＝Y1/Y2-1，
wherein X is the power deviation rate, Y1 is the current running power, and Y2 is the historical maximum power.
According to one embodiment of the invention, historical power data curves of the cooling tower fan, the cooling pump and the freezing pump are generated by recording the operating power of the cooling tower fan, the cooling pump and the freezing pump in real time during the operation of the central air conditioning system.
To achieve the above object, a second aspect of the present invention provides a non-transitory computer readable storage medium having a computer program stored thereon, which when executed by a processor, implements the above-mentioned auxiliary machine power-on self-diagnosis method of a central air conditioning system.
According to the non-transitory computer readable storage medium, the states of the cooling tower fan, the cooling pump and the freezing pump can be effectively detected in the running process of the central air conditioner by executing the auxiliary machine starting-up self-diagnosis method of the central air conditioner system, so that the system is ensured to run in an optimal state, and further the energy-saving effect is achieved.
In order to achieve the above object, an embodiment of a third aspect of the present invention provides an auxiliary machine startup self-diagnosis device of a central air conditioning system, where the auxiliary machine includes a cooling tower, a cooling pump and a freezing pump, a heat exchange flow path formed by the cooling tower and the cooling pump exchanges heat with a condenser in a host machine, and a heat exchange flow path formed by the freezing pump and a terminal unit exchanges heat with an evaporator in the host machine, and the device includes a power acquisition module, a calculation module and a self-diagnosis module, where the self-diagnosis module is used for controlling a cooling tower fan, the cooling pump and the freezing pump to operate at a preset maximum power frequency when the central air conditioning system operates in a fast cooling startup mode; the power acquisition module is used for respectively operating the cooling tower fan, the cooling pump and the freezing pump at preset maximum power frequency, acquiring the current operating power of the cooling tower fan, the cooling pump and the freezing pump, and acquiring the historical maximum power of the cooling tower fan, the cooling pump and the freezing pump; the calculating module is used for calculating the power deviation rate of the cooling tower fan according to the current running power of the cooling tower fan and the historical maximum power of the cooling tower fan, calculating the power deviation rate of the cooling pump according to the current running power of the cooling pump and the historical maximum power of the cooling pump, and calculating the power deviation rate of the freezing pump according to the current running power of the freezing pump and the historical maximum power of the freezing pump; the self-diagnosis module is further used for performing self-diagnosis on the corresponding cooling tower fan, cooling pump and freezing pump according to the power deviation rate of the cooling tower fan, the power deviation rate of the cooling pump and the power deviation rate of the freezing pump.
According to the auxiliary machine starting-up self-diagnosis device of the central air conditioning system, when the central air conditioning system operates in a quick cooling starting mode, the self-diagnosis module controls the cooling tower fan, the cooling pump and the freezing pump to operate at a preset maximum power frequency, and respectively operates at the preset maximum power frequency, current operating powers of the cooling tower fan, the cooling pump and the freezing pump are obtained through the power obtaining module, historical maximum powers of the cooling tower fan, the cooling pump and the freezing pump are obtained, then the power deviation rate of the cooling tower fan is calculated through the calculation module according to the current operating powers of the cooling tower fan and the historical maximum powers of the cooling tower fan, the power deviation rate of the cooling pump is calculated according to the current operating powers of the cooling pump and the historical maximum powers of the cooling pump, and the self-diagnosis module respectively carries out self-diagnosis on the corresponding cooling tower fan, cooling pump and freezing pump according to the power deviation rate of the cooling tower fan, the power deviation rate of the cooling pump and the power deviation rate of the freezing pump. Therefore, the device can effectively detect the states of the cooling tower fan, the cooling pump and the freezing pump in the running process of the central air conditioner, ensures that the system runs in the optimal state, and further plays a role in energy conservation.
In addition, the auxiliary machine starting-up self-diagnosis device of the central air conditioning system provided by the embodiment of the invention can also have the following additional technical characteristics:
according to one embodiment of the present invention, when the self-diagnosis module performs self-diagnosis on the corresponding cooling tower fan, cooling pump and freezing pump according to the power deviation rate of the cooling tower fan, the power deviation rate of the cooling pump and the power deviation rate of the freezing pump, the self-diagnosis module is further configured to determine the power deviation rate of the cooling tower fan, the power deviation rate of the cooling pump and the power deviation rate of the freezing pump, respectively; if the power deviation rate of the cooling tower fan, the power deviation rate of the cooling pump and the power deviation rate of the freezing pump are respectively more than or equal to 0 and less than a first preset value, judging that the cooling tower fan, the cooling pump and the freezing pump are respectively in a normal operation range; if the power deviation rate of the cooling tower fan, the power deviation rate of the cooling pump and the power deviation rate of the freezing pump are respectively larger than or equal to a first preset value and smaller than or equal to a second preset value, judging that the cooling tower fan, the cooling pump and the freezing pump are respectively required to be maintained; and if the power deviation rate of the cooling tower fan, the power deviation rate of the cooling pump and the power deviation rate of the freezing pump are respectively larger than a second preset value, judging that the cooling tower fan, the cooling pump and the freezing pump are respectively required to be checked and maintained.
According to one embodiment of the invention, the calculation module calculates the power deviation rate according to the following formula:
X＝Y1/Y2-1，
wherein X is the power deviation rate, Y1 is the current running power, and Y2 is the historical maximum power.
According to an embodiment of the present invention, the auxiliary machine startup self-diagnosis device of the central air conditioning system further comprises a recording module, wherein the recording module records the operation power of the cooling tower fan, the cooling pump and the freezing pump in real time to generate historical power data curves of the cooling tower fan, the cooling pump and the freezing pump respectively during the operation process of the central air conditioning system.
In order to achieve the above object, a fourth aspect of the present invention provides a central air conditioning system, which includes the auxiliary power-on self-diagnosis device of the central air conditioning system.
According to the central air conditioning system provided by the embodiment of the invention, the auxiliary machine starting-up self-diagnosis device of the central air conditioning system can effectively detect the states of the cooling tower fan, the cooling pump and the freezing pump in the running process of the central air conditioner, so that the system is ensured to run in an optimal state, and further the energy-saving effect is achieved.
Drawings
Fig. 1 is a schematic structural view of a central air conditioning system according to an embodiment of the present invention;
Fig. 2 is a flowchart of an auxiliary power-on self-diagnosis method of a central air conditioning system according to an embodiment of the present invention;
fig. 3 is a block schematic diagram of an auxiliary power-on self-diagnosis device of a central air-conditioning system according to an embodiment of the present invention;
fig. 4 is a block diagram illustrating an auxiliary power-on self-diagnosis apparatus of a central air conditioning system according to an embodiment of the present invention.
Reference numerals:
a compressor 10, an evaporator 20, a condenser 30, a throttle valve 40, a cooling tower 50, a cooling pump 60, a freeze pump 70, an end unit 80, and a cooling tower fan 90.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
An auxiliary power-on self-diagnosis method of a central air conditioning system, an auxiliary power-on self-diagnosis device of a central air conditioning system, and a central air conditioning system having the same according to embodiments of the present invention are described below with reference to the accompanying drawings.
In an embodiment of the present invention, the auxiliary machine may include a cooling tower, a cooling pump, and a freezing pump, wherein a heat exchange flow path formed by the cooling tower and the cooling pump exchanges heat with a condenser in the main machine, and a heat exchange flow path formed by the freezing pump and the terminal unit exchanges heat with an evaporator in the main machine.
Specifically, as shown in fig. 1, the central air conditioning system may be mainly composed of three major parts of a main machine, an air conditioning water system including a chilled water system and a cooling water system, and an auxiliary machine may include a cooling tower 50, a cooling pump 60, and a chilled pump 70. The main machine is the core of the whole system, when the central air conditioning system operates in a refrigerating mode, the refrigerating main machine provides cold for the whole system, and the refrigerating principle is as follows: the compressor 10 compresses the low-temperature low-pressure gaseous refrigerant into a high-temperature high-pressure gaseous refrigerant, so that the volume of the refrigerant is reduced, the pressure is increased, then the high-temperature high-pressure gaseous refrigerant is sent into the condenser 30, the high-temperature high-pressure gaseous refrigerant is condensed and radiated in the condenser 30 to become a low-temperature high-pressure liquid refrigerant, the low-temperature low-pressure gaseous refrigerant becomes a low-temperature low-pressure gas-liquid mixed state after being throttled and depressurized by the throttle valve 40, and then the low-temperature low-pressure gas-liquid mixed state enters the evaporator 20, the evaporator 20 absorbs heat by evaporation, and then the low-temperature low-pressure gaseous refrigerant returns to the compressor 10, so that the refrigeration cycle is completed.
The two ends of the evaporator 20 are connected with a chilled water system, a heat exchange flow path is formed by a chilled pump 70 and a tail end unit 80 in the chilled water system, and the chilled water system exchanges heat with the evaporator 20 in the refrigeration host, namely, the chilled water system is responsible for conveying chilled water from the refrigeration host to a user end, exchanges heat through a fan coil, blows cold air, and the chilled water after heat exchange returns to the refrigeration host for refrigeration. The two ends of the condenser 30 are connected with a cooling water system, a cooling tower 50 and a cooling pump 60 in the cooling water system form a heat exchange flow path to exchange heat with the condenser 30 in the refrigeration host, the cooling tower 50 discharges heat, namely, the cooling water system absorbs the heat at one end of the refrigeration water through the refrigeration host and inputs the heat into the cooling tower 50 for cooling, and then the heat returns to the refrigeration host to absorb the heat at one end of the refrigeration water.
The cooling water system comprises a cooling water loop and a cooling tower loop, wherein the cooling water loop is provided with: the water supply of the condenser 30 is transferred by the cooling pump 60, and heat exchange between the cooling backwater and the refrigerant is realized. Cooling tower loop: the cooling water exiting the condenser 30 carries a significant amount of heat, which is exchanged with the surrounding environment in the cooling tower 50 for cooling.
After the central air conditioner is installed and debugged, the initial state of the equipment is relatively good, and no large mechanical loss exists, but after the equipment runs for a period of time, impurities enter the bearing because of poor lubrication, so that the mechanical loss is increased, and the mechanical efficiency of the equipment is affected. During the operation of the central air conditioner, it is difficult for the user to find the mechanical losses of these power units.
In order to solve the problem that the mechanical efficiency of three power devices, namely a freezing pump, a cooling pump and a cooling tower fan, cannot be effectively detected, the invention provides an auxiliary machine starting-up self-diagnosis method of a central air conditioning system, each power device is enabled to operate at the maximum power frequency within a period of time (such as 30 min) when the central air conditioning system is started up, and the power deviation rate of the device is compared between the current maximum power of the corresponding device and the historical maximum power, so that the device state is detected.
Fig. 2 is a flowchart of an auxiliary power-on self-diagnosis method of a central air conditioning system according to an embodiment of the present invention.
As shown in fig. 2, the auxiliary machine startup self-diagnosis method of the central air conditioning system according to the embodiment of the invention may include the following steps:
s1, when the central air conditioning system operates in a quick cooling start mode, controlling the cooling tower fan, the cooling pump and the freezing pump to operate at a preset maximum power frequency, and obtaining the current operating power of the cooling tower fan, the cooling pump and the freezing pump.
The quick cooling starting mode refers to the refrigerating capacity required by the central air conditioning system for quickly calculating the system, and starts up and operates according to the calculated capacity.
The maximum frequencies of the cooling tower fan, the cooling pump and the freezing pump are all power frequency, the maximum power is limited, the working media flowing through the cooling tower and the cooling pump are all water, the density is basically unchanged, the flow and the power are directly related to the frequency, wherein the flow is directly proportional to the first power of the rotating speed, and the power is directly proportional to the third power of the rotating speed.
S2, obtaining historical maximum power of a cooling tower fan, a cooling pump and a freezing pump. The historical maximum power is generally the running power when the device is installed and debugged and is operated at the preset maximum power frequency.
S3, calculating the power deviation rate of the cooling tower fan according to the current running power of the cooling tower fan and the historical maximum power of the cooling tower fan, calculating the power deviation rate of the cooling pump according to the current running power of the cooling pump and the historical maximum power of the cooling pump, and calculating the power deviation rate of the freezing pump according to the current running power of the freezing pump and the historical maximum power of the freezing pump.
According to one embodiment of the present invention, the power deviation rate may be calculated according to the following formula (1):
X＝Y1/Y2-1(1)
Wherein X is the power deviation rate, Y1 is the current running power, and Y2 is the historical maximum power.
That is, after the operation power and the historical maximum power of the cooling tower fan, the cooling pump, and the freezing pump when operated at the preset maximum power frequency are obtained, the power offset rates of the cooling tower fan, the cooling pump, and the freezing pump are calculated according to the above formula (1), respectively.
S4, performing self-diagnosis on the corresponding cooling tower fan, cooling pump and freezing pump according to the power deviation rate of the cooling tower fan, the power deviation rate of the cooling pump and the power deviation rate of the freezing pump.
According to one embodiment of the present invention, the self-diagnosis of the respective cooling tower fan, cooling pump and freezing pump is performed according to the power deviation rate of the cooling tower fan, the power deviation rate of the cooling pump and the power deviation rate of the freezing pump, respectively, comprising: judging the power deviation rate of the cooling tower fan, the power deviation rate of the cooling pump and the power deviation rate of the freezing pump respectively, and judging that the cooling tower fan, the cooling pump and the freezing pump are in normal operation ranges respectively if the power deviation rate of the cooling tower fan, the power deviation rate of the cooling pump and the power deviation rate of the freezing pump are respectively more than or equal to 0 and less than a first preset value; if the power deviation rate of the cooling tower fan, the power deviation rate of the cooling pump and the power deviation rate of the freezing pump are respectively larger than or equal to a first preset value and smaller than or equal to a second preset value, judging that the cooling tower fan, the cooling pump and the freezing pump are respectively required to be maintained; and if the power deviation rate of the cooling tower fan, the power deviation rate of the cooling pump and the power deviation rate of the freezing pump are respectively larger than the second preset value, judging that the cooling tower fan, the cooling pump and the freezing pump are respectively required to be checked and maintained. The first preset value and the second preset value can be calibrated according to actual conditions.
In one embodiment of the present invention, historical power data curves of the cooling tower fan, the cooling pump and the cryopump are generated during operation of the central air conditioning system by recording in real time the operating powers of the cooling tower fan, the cooling pump and the cryopump, respectively. That is, the user can obtain the number of the host computers started when the central air conditioning system stably operates under the current load and the working condition according to the historical data recorded on the historical power data curve, and can intuitively see the state of each power device and predict the state change trend of the power device from the historical power data curve, and take corresponding measures according to the state of the device in time.
Specifically, when the central air conditioning system meets a starting condition (such as a set time or a set temperature) and a refrigerating requirement exists indoors, the central air conditioning system operates in a quick-cooling starting mode, obtains required refrigerating capacity according to load prediction, and obtains the starting number when the load and the working condition stably operate by combining stored historical data to determine the starting number of the host. And then controlling the cooling tower fan, the cooling pump and the freezing pump to operate according to the maximum frequency, respectively acquiring the current operating power Y1 of each power device (the cooling tower fan, the cooling pump and the freezing pump), and acquiring the historical maximum power Y2 corresponding to each power device from a historical power database. Calculating the power offset rate of each power device according to the formula X=Y1/Y2-1, and then performing self-diagnosis on the corresponding power device according to the power offset rate of each power device, for example, when the power offset rate X of the cooling tower fan is more than or equal to 0 and less than a first preset value A, judging that the cooling tower fan is in a normal operation range; when A is more than or equal to X is more than or equal to a second preset value B, judging that the cooling tower fan needs maintenance; when X is more than B, judging that the cooling tower fan needs to be checked and maintained. The self-diagnosis method of the cooling pump and the freezing pump is the same as the self-diagnosis method of the cooling tower fan, and is not described in detail to avoid redundancy.
In the process, the current load of each power device and the current running power of each power device in stable running under the working condition, which are acquired in real time, are recorded and stored, so that each power device can be started up for self-diagnosis next time.
Because the auxiliary machine starting-up self-diagnosis method of the central air-conditioning system can control each power device to operate at the maximum power frequency within a period of time when the central air-conditioning system is started up and operated, and compare the current operating power during the maximum power frequency operation with the historical maximum power to acquire the power offset rate of each power device, thereby detecting the state of the device, taking the parameter in the standard state as a reference, enabling the system to detect the state of the device more intelligently, ensuring the system to operate in the optimal state, and further playing the role of saving energy.
In summary, according to the auxiliary machine startup self-diagnosis method of the central air conditioning system in the embodiment of the invention, when the central air conditioning system operates in the quick cooling startup mode, the cooling tower fan, the cooling pump and the freezing pump are controlled to operate at a preset maximum power frequency, the current operating power of the cooling tower fan, the cooling pump and the freezing pump is obtained, and the historical maximum power of the cooling tower fan, the cooling pump and the freezing pump is obtained. Calculating the power deviation rate of the cooling tower fan according to the current running power of the cooling tower fan and the historical maximum power of the cooling tower fan, calculating the power deviation rate of the cooling pump according to the current running power of the cooling pump and the historical maximum power of the cooling pump, and calculating the power deviation rate of the freezing pump according to the current running power of the freezing pump and the historical maximum power of the freezing pump. And performing self-diagnosis on the corresponding cooling tower fan, cooling pump and freezing pump according to the power deviation rate of the cooling tower fan, the power deviation rate of the cooling pump and the power deviation rate of the freezing pump. Therefore, the method can effectively detect the states of the cooling tower fan, the cooling pump and the freezing pump in the running process of the central air conditioner, ensures that the system runs in the optimal state, and further plays a role in energy conservation.
Fig. 3 is a block schematic diagram of an auxiliary power-on self-diagnosis device of a central air-conditioning system according to an embodiment of the present invention.
In an embodiment of the present invention, as shown in fig. 1, the auxiliary machine may include a cooling tower 50, a cooling pump 60 and a freezing pump 70, wherein a heat exchange flow path formed by the cooling tower 50 and the cooling pump 60 exchanges heat with the condenser 30 in the main machine, and a heat exchange flow path formed by the freezing pump 70 and the terminal unit 80 exchanges heat with the evaporator 20 in the main machine.
As shown in fig. 3, the auxiliary power-on self-diagnosis device of the central air conditioning system according to the embodiment of the invention may include: a power acquisition module 100, a calculation module 200, and a self-diagnostic module 300.
The self-diagnosis module 300 is used for controlling the cooling tower fan 90, the cooling pump 60 and the freezing pump 70 to operate at a preset maximum power frequency when the central air conditioning system operates in a rapid cooling start-up mode. The power obtaining module 100 is configured to operate the cooling tower fan 90, the cooling pump 60, and the freezing pump 70 at a preset maximum power frequency, obtain current operating powers of the cooling tower fan 90, the cooling pump 60, and the freezing pump 70, and obtain historical maximum powers of the cooling tower fan 90, the cooling pump 60, and the freezing pump 70. The calculation module 200 is configured to calculate a power deviation rate of the cooling tower fan 90 according to the current operation power of the cooling tower fan 90 and the historical maximum power of the cooling tower fan 90, calculate a power deviation rate of the cooling pump 60 according to the current operation power of the cooling pump 60 and the historical maximum power of the cooling pump 60, and calculate a power deviation rate of the freezing pump 70 according to the current operation power of the freezing pump 70 and the historical maximum power of the freezing pump 70. The self-diagnostic module 300 is further configured to self-diagnose the respective cooling tower blower 90, cooling pump 60, and freeze pump 70 based on the power deviation rate of the cooling tower blower 90, the power deviation rate of the cooling pump 60, and the power deviation rate of the freeze pump 70, respectively.
According to one embodiment of the present invention, when the self-diagnosis module 300 performs the self-diagnosis on the respective cooling tower blower 90, cooling pump 60 and freezing pump 70 according to the power deviation rate of the cooling tower blower 90, the power deviation rate of the cooling pump 60 and the power deviation rate of the freezing pump 70, respectively, it is further used to determine that the power deviation rate of the cooling tower blower 90, the power deviation rate of the cooling pump 60 and the power deviation rate of the freezing pump 70 are respectively, and if the power deviation rate of the cooling tower blower 90, the power deviation rate of the cooling pump 60 and the power deviation rate of the freezing pump 70 are respectively greater than or equal to 0 and less than a first preset value, it is determined that the cooling tower blower 90, the cooling pump 60 and the freezing pump 70 are respectively in a normal operation range; if the power deviation rate of the cooling tower fan 90, the power deviation rate of the cooling pump 60, and the power deviation rate of the freezing pump 70 are respectively greater than or equal to a first preset value and less than or equal to a second preset value, it is determined that maintenance is required for the cooling tower fan 90, the cooling pump 60, and the freezing pump 70, respectively; if the power deviation rate of the cooling tower fan 90, the power deviation rate of the cooling pump 60, and the power deviation rate of the freezing pump 70 are respectively greater than the second preset value, it is determined that the cooling tower fan 90, the cooling pump 60, and the freezing pump 70 respectively need to be inspected and maintained.
According to one embodiment of the present invention, the calculation module 200 calculates the power deviation rate according to the above formula (1).
According to an embodiment of the present invention, the auxiliary machine startup self-diagnosis device of the central air conditioning system further includes a recording module 400, wherein during the operation of the central air conditioning system, the recording module 400 generates historical power data curves of the cooling tower fan 90, the cooling pump 60 and the freezing pump 70 by recording the operation power of the cooling tower fan 90, the cooling pump 60 and the freezing pump 70 in real time.
It should be noted that, for details not disclosed in the auxiliary machine starting-up self-diagnosis device of the central air-conditioning system in the embodiment of the present invention, please refer to details disclosed in the auxiliary machine starting-up self-diagnosis method of the central air-conditioning system in the embodiment of the present invention, and details are not described here again.
According to the auxiliary machine starting-up self-diagnosis device of the central air conditioning system, when the central air conditioning system operates in a quick cooling starting mode, the self-diagnosis module controls the cooling tower fan, the cooling pump and the freezing pump to operate at a preset maximum power frequency, and respectively operates at the preset maximum power frequency, current operating powers of the cooling tower fan, the cooling pump and the freezing pump are obtained through the power obtaining module, historical maximum powers of the cooling tower fan, the cooling pump and the freezing pump are obtained, then the power deviation rate of the cooling tower fan is calculated through the calculation module according to the current operating powers of the cooling tower fan and the historical maximum powers of the cooling tower fan, the power deviation rate of the cooling pump is calculated according to the current operating powers of the cooling pump and the historical maximum powers of the cooling pump, and the self-diagnosis module respectively carries out self-diagnosis on the corresponding cooling tower fan, cooling pump and freezing pump according to the power deviation rate of the cooling tower fan, the power deviation rate of the cooling pump and the power deviation rate of the freezing pump. Therefore, the device can effectively detect the states of the cooling tower fan, the cooling pump and the freezing pump in the running process of the central air conditioner, ensures that the system runs in the optimal state, and further plays a role in energy conservation.
In addition, the embodiment of the invention also provides a non-transitory computer readable storage medium, on which a computer program is stored, which when executed by a processor, implements the auxiliary machine startup self-diagnosis method of the central air conditioning system.
According to the non-transitory computer readable storage medium, the states of the cooling tower fan, the cooling pump and the freezing pump can be effectively detected in the running process of the central air conditioner by executing the auxiliary machine starting-up self-diagnosis method of the central air conditioner system, so that the system is ensured to run in an optimal state, and further the energy-saving effect is achieved.
In addition, the embodiment of the invention also provides a central air conditioning system, which comprises the auxiliary machine starting-up self-diagnosis device of the central air conditioning system.
According to the central air conditioning system provided by the embodiment of the invention, the auxiliary machine starting-up self-diagnosis device of the central air conditioning system can effectively detect the states of the cooling tower fan, the cooling pump and the freezing pump in the running process of the central air conditioner, so that the system is ensured to run in an optimal state, and further the energy-saving effect is achieved.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and additional implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order from that shown or discussed, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the embodiments of the present invention.
Logic and/or steps represented in the flowcharts or otherwise described herein, e.g., a ordered listing of executable instructions for implementing logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). In addition, the computer readable medium may even be paper or other suitable medium on which the program is printed, as the program may be electronically captured, via, for instance, optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner, if necessary, and then stored in a computer memory.
It is to be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. As with the other embodiments, if implemented in hardware, may be implemented using any one or combination of the following techniques, as is well known in the art: discrete logic circuits having logic gates for implementing logic functions on data signals, application specific integrated circuits having suitable combinational logic gates, programmable Gate Arrays (PGAs), field Programmable Gate Arrays (FPGAs), and the like.
Those of ordinary skill in the art will appreciate that all or a portion of the steps carried out in the method of the above-described embodiments may be implemented by a program to instruct related hardware, where the program may be stored in a computer readable storage medium, and where the program, when executed, includes one or a combination of the steps of the method embodiments.
In addition, each functional unit in the embodiments of the present invention may be integrated in one processing module, or each unit may exist alone physically, or two or more units may be integrated in one module. The integrated modules may be implemented in hardware or in software functional modules. The integrated modules may also be stored in a computer readable storage medium if implemented in the form of software functional modules and sold or used as a stand-alone product.
The above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, or the like. While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
Claims (6)
1. The auxiliary machine starting-up self-diagnosis method of the central air conditioning system is characterized in that the auxiliary machine comprises a cooling tower, a cooling pump and a freezing pump, a heat exchange flow path formed by the cooling tower and the cooling pump exchanges heat with a condenser in a host machine, and a heat exchange flow path formed by the freezing pump and a tail end unit exchanges heat with an evaporator in the host machine, and the method comprises the following steps:
When the central air conditioning system operates in a quick cooling start mode, controlling a cooling tower fan, a cooling pump and a freezing pump to operate at a preset maximum power frequency, and acquiring the current operating power of the cooling tower fan, the cooling pump and the freezing pump;
acquiring historical maximum power of the cooling tower fan, the cooling pump and the freezing pump, wherein the historical maximum power is the running power of the central air conditioning system when the central air conditioning system is initially operated at a preset maximum power frequency after installation and debugging are completed, and the historical maximum power is acquired from a historical power database;
calculating a power deviation rate of the cooling tower fan according to the current running power of the cooling tower fan and the historical maximum power of the cooling tower fan, calculating a power deviation rate of the cooling pump according to the current running power of the cooling pump and the historical maximum power of the cooling pump, and calculating a power deviation rate of the freezing pump according to the current running power of the freezing pump and the historical maximum power of the freezing pump;
performing self-diagnosis on the corresponding cooling tower fan, cooling pump and freezing pump according to the power deviation rate of the cooling tower fan, the power deviation rate of the cooling pump and the power deviation rate of the freezing pump, respectively, wherein the self-diagnosis on the corresponding cooling tower fan, cooling pump and freezing pump according to the power deviation rate of the cooling tower fan, the power deviation rate of the cooling pump and the power deviation rate of the freezing pump, respectively, comprises the following steps: respectively judging the power deviation rate of the cooling tower fan, the power deviation rate of the cooling pump and the power deviation rate of the freezing pump; if the power deviation rate of the cooling tower fan, the power deviation rate of the cooling pump and the power deviation rate of the freezing pump are respectively more than or equal to 0 and less than a first preset value, judging that the cooling tower fan, the cooling pump and the freezing pump are respectively in a normal operation range; if the power deviation rate of the cooling tower fan, the power deviation rate of the cooling pump and the power deviation rate of the freezing pump are respectively larger than or equal to a first preset value and smaller than or equal to a second preset value, judging that the cooling tower fan, the cooling pump and the freezing pump are respectively required to be maintained; if the power deviation rate of the cooling tower fan, the power deviation rate of the cooling pump and the power deviation rate of the freezing pump are respectively larger than a second preset value, judging that the cooling tower fan, the cooling pump and the freezing pump are respectively required to be checked and maintained;
In the running process of the central air conditioning system, the running power of the cooling tower fan, the running power of the cooling pump and the running power of the freezing pump are recorded in real time to respectively generate historical power data curves of the cooling tower fan, the historical power data curves of the cooling pump and the historical power data curves, so that when the central air conditioning system runs in a quick cooling starting mode, the starting number under the current load and the current working condition is obtained according to the historical power data curves.
2. The auxiliary power-on self-diagnosis method of a central air-conditioning system according to claim 1, wherein the power deviation rate is calculated according to the following formula:
X＝Y1/Y2-1，
wherein X is the power deviation rate, Y1 is the current running power, and Y2 is the historical maximum power.
3. A non-transitory computer-readable storage medium having stored thereon a computer program, wherein the program when executed by a processor implements the auxiliary power-on self-diagnosis method of the central air-conditioning system according to any one of claims 1 to 2.
4. The auxiliary machine starting-up self-diagnosis device of the central air conditioning system is characterized in that the auxiliary machine comprises a cooling tower, a cooling pump and a freezing pump, a heat exchange flow path formed by the cooling tower and the cooling pump exchanges heat with a condenser in a host machine, a heat exchange flow path formed by the freezing pump and a tail end unit exchanges heat with an evaporator in the host machine, the device comprises a power acquisition module, a calculation module and a self-diagnosis module,
The self-diagnosis module is used for controlling the cooling tower fan, the cooling pump and the freezing pump to operate at a preset maximum power frequency when the central air conditioning system operates in a quick cooling start mode;
the power acquisition module is used for respectively operating the cooling tower fan, the cooling pump and the freezing pump at a preset maximum power frequency, acquiring the current operating power of the cooling tower fan, the cooling pump and the freezing pump, and acquiring the historical maximum power of the cooling tower fan, the cooling pump and the freezing pump, wherein the historical maximum power is the operating power of the central air conditioning system when the central air conditioning system is initially operated at the preset maximum power frequency after being installed and debugged, and the power acquisition module is specifically used for acquiring the historical maximum power from a historical power database;
the calculating module is used for calculating the power deviation rate of the cooling tower fan according to the current running power of the cooling tower fan and the historical maximum power of the cooling tower fan, calculating the power deviation rate of the cooling pump according to the current running power of the cooling pump and the historical maximum power of the cooling pump, and calculating the power deviation rate of the freezing pump according to the current running power of the freezing pump and the historical maximum power of the freezing pump;
The self-diagnosis module is further configured to perform self-diagnosis on the corresponding cooling tower fan, cooling pump and freezing pump according to the power deviation rate of the cooling tower fan, the power deviation rate of the cooling pump and the power deviation rate of the freezing pump, respectively, wherein the self-diagnosis module is further configured to, when performing self-diagnosis on the corresponding cooling tower fan, cooling pump and freezing pump according to the power deviation rate of the cooling tower fan, the power deviation rate of the cooling pump and the power deviation rate of the freezing pump, respectively,
respectively judging the power deviation rate of the cooling tower fan, the power deviation rate of the cooling pump and the power deviation rate of the freezing pump;
if the power deviation rate of the cooling tower fan, the power deviation rate of the cooling pump and the power deviation rate of the freezing pump are respectively more than or equal to 0 and less than a first preset value, judging that the cooling tower fan, the cooling pump and the freezing pump are respectively in a normal operation range;
if the power deviation rate of the cooling tower fan, the power deviation rate of the cooling pump and the power deviation rate of the freezing pump are respectively larger than or equal to a first preset value and smaller than or equal to a second preset value, judging that the cooling tower fan, the cooling pump and the freezing pump are respectively required to be maintained;
If the power deviation rate of the cooling tower fan, the power deviation rate of the cooling pump and the power deviation rate of the freezing pump are respectively larger than a second preset value, judging that the cooling tower fan, the cooling pump and the freezing pump are respectively required to be checked and maintained;
and the recording module is used for recording the running power of the cooling tower fan, the cooling pump and the freezing pump in real time in the running process of the central air conditioning system so as to respectively generate historical power data curves of the cooling tower fan, the cooling pump and the freezing pump, so that when the central air conditioning system runs in a quick cooling starting mode, the starting number under the current load and the working condition is obtained according to the historical power data curves.
5. The auxiliary power-on self-diagnosis device of a central air-conditioning system according to claim 4, wherein the calculation module calculates the power deviation rate according to the following formula:
X＝Y1/Y2-1，
wherein X is the power deviation rate, Y1 is the current running power, and Y2 is the historical maximum power.
6. A central air conditioning system, characterized by comprising the auxiliary power-on self-diagnosis device of the central air conditioning system according to any one of claims 4 to 5.
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| CN109827289B (en) * | 2019-01-03 | 2020-06-05 | 珠海格力电器股份有限公司 | Method, device and system for determining system fault |
| CN114427742B (en) * | 2022-01-27 | 2022-09-30 | 广州施杰节能科技有限公司 | Central air-conditioning cold station energy efficiency control method, device, equipment and storage medium |
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| JP2007253102A (en) * | 2006-03-24 | 2007-10-04 | Suzuki Motor Corp | Ventilator for coating booth in production line of automobile |
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