JPH07158937A - Controller for refrigerating cycle - Google Patents

Abstract

PURPOSE:To minimize the total electric power consumption in a refrigerating system by controlling the number of revolutions of each of a compressor, an outdoor blower and an indoor blower, following after the fluctuations of indoor and outdoor loads and speedily stabilizing a refrigerating cycle. CONSTITUTION:A refrigerating cycle controller is constituted of a refrigerator comprising a compressor 1 housing a motor, an outdoor heat exchanger 26 having an outdoor blower 27, a choke mechanism 23 and an indoor heat exchanger 24 having an indoor blower 25, and controllers 4, 28, 30 which compare operation results obtained by interrelating the number of revolutions of each of these driving devices on the basis of a preset empirical constant with a preset judgement reference and which control the number of revolutions of each of the driving devices 1, 27, 25 according to the results of comparison.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigeration cycle control device.

[0002]

2. Description of the Related Art FIG. 11 shows, for example, JP-A-2-75859.
In the figure, 1 is a compressor, 2 is a condenser, 4 is an inverter for controlling the frequency of the compressor 1, and 7 is the suction pressure of the compressor 1. The suction pressure sensor, 8 is a control unit, 9 is a condenser-side blower, 10 is a blowing control unit, 11 is a condensation pressure or temperature sensor, and 12 is a current sensor.

Next, the operation will be described. During cooling operation,
The frequency of the compressor 1 is controlled by the inverter 4 until the suction pressure detected by the suction pressure sensor 7 becomes substantially constant. Next, when the suction pressure of the compressor 1 becomes stable,
The current sensor 12 detects the input current of the inverter 4, and the blower control unit 10 controls the rotation speed of the condenser-side blower 9 so that the detected current value becomes smaller, thereby changing the amount of blown air. By repeating this control, the control unit 8
However, when the suction pressure of the compressor 1 is almost constant, the minimum input of the inverter 4 (the minimum input sum of the compressor 1 and the condenser side blower 9) for each condensation temperature corresponding to the change of the outside air temperature is realized. The number of rotations of the condenser side blower 9 is determined and controlled by this number of rotations.

[0004]

Since the conventional method of controlling the blower is configured as described above, the frequency control of the compressor and the rotation speed of the condenser side blower are controlled without being related to each other, and In order to reduce the input current of the inverter, changing the rotation speed of the blower on the condenser side and changing the condensing temperature (pressure) changes the evaporation pressure (suction pressure of the compressor) that is linked to this condensing pressure. As a result, the suction pressure of the compressor does not stabilize easily, the flow of the control process does not proceed smoothly, and the inverter input (total power consumption of the compressor and the blower on the condenser side) does not easily reach the minimum value, and the refrigeration cycle Is not stable either. In addition, the cold / warm set temperature in the room,
Even if the indoor load changes due to changes in the number of people in the room, such as opening and closing the indoor door, the evaporation pressure (compressor suction pressure) changes in conjunction with this change in the indoor load, so the flow of the control process is smooth. There was a problem that the inverter input did not reach the minimum value and the refrigeration cycle was not stable.

The present invention has been made in order to solve the above problems, and the calculation results obtained by correlating the rotation speeds of various devices that determine the power consumption of the refrigeration system with each other by a preset empirical constant. Even if the outdoor load changes due to weather conditions such as rain, wind, snow, etc. Even if the indoor load changes due to changes in the number of people in the room, such as opening and closing the doors, the control flow can be smoothly progressed by following this change to stabilize the refrigeration cycle speedily and reduce the total power consumption of the refrigeration system. An object is to obtain a highly reliable refrigeration cycle control device that minimizes.

Further, the calculation result obtained by correlating the rotational speeds of the respective drive devices with each other by a preset empirical constant is compared with the set judgment standard, and the comparison result and the room temperature of the characteristic detection thermometer are compared. Based on the characteristic signal corresponding to the temperature difference from the set temperature, when the characteristic signal corresponding to the temperature difference exceeds a predetermined value, the indoor heat exchanger is controlled to maximize the heat exchange capacity, and the temperature When the characteristic signal corresponding to the difference is within the specified value, the heat exchange capacity of the indoor heat exchanger is controlled within the specified range and the total input of each drive device is controlled to be the minimum, and the outdoor load and the indoor load are controlled. Changes,
Following this change, the control flow proceeds smoothly, the indoor temperature always becomes a comfortable and comfortable cooling / heating temperature, the refrigeration cycle is stabilized quickly, and the total power consumption of the refrigeration system is minimized. The object is to obtain a refrigeration cycle control device.

Further, the preset empirical constants are used for each electric characteristic sensor for detecting each electric characteristic value corresponding to the input of each driving device and for the high pressure and low pressure sensors for detecting the heat exchange capacity of the indoor heat exchanger. Comparing each detection result of the corresponding ability detection sensor and the determination result of the determination unit, when the comparison result exceeds a predetermined value, the preset empirical constant is not corrected,
When the comparison result is within a predetermined value, it is replaced by an empirical constant calculated based on each detection result of each electric characteristic sensor and each capacity characteristic value force sensor to correct it, and due to secular change, an indoor heat exchanger or an outdoor Even if the performance of the indoor heat exchanger or the outdoor heat exchanger changes due to foreign substances adhering to and deposits on the heat transfer surface of the heat exchanger, or if the installation conditions change, these changes are stable and follow the changes. An object is to obtain a highly reliable refrigeration cycle control device for controlling.

[0008]

In a refrigeration cycle control device according to the present invention, a compressor containing an electric motor, an outdoor heat exchanger having an outdoor blower, a throttle mechanism, and an indoor heat exchanger having an indoor blower are sequentially arranged. A refrigeration unit connected by piping, and a control unit for controlling each compressor of the refrigeration unit, the indoor blower, and the outdoor blower are provided, and the control unit is preset. A storage unit that stores an empirical constant, and the input of each drive device and the heat exchange capacity of the indoor heat exchanger with respect to each rotation speed change of each drive device based on the set empirical constant stored in this storage unit. And a calculation result of this calculation unit and a preset judgment standard are compared, and from the comparison result, the heat exchange capacity of the indoor heat exchanger is maintained within a predetermined range, and Serial a determination unit for determining the rotational speed combinations between the respective driving devices to minimize the total input of each drive device,
And a control unit that controls the number of rotations of each drive device based on the determination result of the determination unit.

Further, a refrigerating apparatus section in which a compressor having a built-in electric motor, an outdoor heat exchanger having an outdoor blower, a throttling mechanism, and an indoor heat exchanger having an indoor blower are sequentially connected by pipes, and this refrigerating apparatus A compressor, the indoor blower, and a control device for controlling each drive device of the outdoor blower, the control device detects a characteristic signal corresponding to a temperature difference between the indoor temperature and the indoor set temperature. A characteristic detection thermostat, a storage unit that stores a preset empirical constant, and an input of each of the above-mentioned drive devices with respect to each rotational speed change of each of the above-mentioned drive devices based on the set empirical constant stored in this storage unit A calculation unit that calculates the heat exchange capacity of the indoor heat exchanger is compared with a calculation result of this calculation unit and a preset determination standard, and the heat exchange capacity of the indoor heat exchanger is determined from the comparison result. Is within a predetermined range, and a judgment unit for judging the rotational speed combination between the driving devices that minimizes the total input of the driving devices, the judgment result of the judging unit and the detection result of the characteristic detection thermometer. On the basis of the above, when the characteristic signal corresponding to the temperature difference exceeds a predetermined value, the rotation speeds of the respective drive devices are set to the respective rotation speeds set in advance to maximize the heat exchange capacity of the indoor heat exchanger. When the characteristic signal corresponding to the temperature difference is within a predetermined value, the control unit controls the number of revolutions of each drive device based on the determination result of the determination unit.

Further, the control device corresponds to each electric characteristic sensor for detecting each electric characteristic value corresponding to the input of each driving device, and a high pressure and low pressure sensor for detecting the heat exchange capacity of the indoor heat exchanger. Comparing the detection results of the capability detection sensor and the detection results of the capability detection sensor and the electrical characteristic sensors with the determination result of the determination unit, and when the comparison result exceeds a predetermined value, the setting stored in the storage unit is set. When the comparison result is within a predetermined value without correcting the empirical constant, the experience that the set empirical constant stored in the storage unit is calculated based on the detection results of the electric characteristic sensors and the capacity characteristic value sensors. And a learning function unit that replaces the constant and corrects it.

Further, the control device is provided with an indoor temperature sensor for detecting the indoor temperature and an outdoor temperature sensor for detecting the outdoor temperature, and the judging section determines the indoor temperature sensor and the outdoor temperature from the calculation result of the calculating section. The determination is made based on the temperature detected by the sensor and a preset determination standard.

Further, the judging section makes a judgment by taking into consideration the heat exchange capacity of the indoor heat exchanger and each weighting function for the total input of each driving device in the above judgment criteria.

[0013]

The controller compares the rotation speed of each drive device, which determines the total power consumption of the refrigeration system, with each other by a preset empirical constant, and compares the calculated result with the set judgment criterion. Based on the comparison result, it is controlled so as to follow changes in the outdoor load and the indoor load, the heat exchange capacity of the indoor heat exchanger is within a predetermined range, and the total input of each drive device is minimized.

Further, the control device controls the rotation speed of each drive device by
By comparing the calculation result obtained by correlating with each other by a preset empirical constant and the set judgment standard, the comparison result and the characteristic signal corresponding to the temperature difference between the room temperature and the set temperature of the characteristic detection thermometer, When the characteristic signal corresponding to the temperature difference exceeds a predetermined value, control is performed to maximize the heat exchange capacity of the indoor heat exchanger, and when the characteristic signal corresponding to the temperature difference is within the predetermined value, the indoor heat The heat exchange capacity of the exchanger is controlled within a predetermined range, and the total input of each drive device is controlled to be the minimum.

Further, the learning function unit uses preset empirical constants as electric characteristic sensors for detecting electric characteristic values corresponding to the inputs of the driving devices and high voltage for detecting heat exchange capacity of the indoor heat exchanger. And comparing each detection result of the ability detection sensor corresponding to the low pressure sensor and the determination result of the determination unit, and when the comparison result exceeds a predetermined value, the preset empirical constant is not corrected and the comparison result is When it is within a predetermined value, it is corrected by replacing it with an empirical constant calculated based on each detection result of each electric characteristic sensor and each capacity characteristic value force sensor.

[0016]

【Example】

Example 1. An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, 1 is a compressor, 4 is an inverter for controlling the rotation speed (frequency) of the compressor 1, 21 is a four-way valve, 2
2 is an accumulator, 23 is a throttle mechanism, 24 is an indoor heat exchanger, 25 is an indoor blower, 26 is an outdoor heat exchanger, 27 is an outdoor blower, 28 is an inverter for controlling the rotation speed of the indoor blower 25, and 29 is an inverter 28. , 30 is an inverter for controlling the rotation speed of the outdoor blower 27, 31 is a controller for giving a control command to the inverter 30, 32 is a controller for giving a control command to the inverter 4, 3
3 is a computing machine for performing various computations, 34 is a judgment machine for selecting and outputting an optimum operation pattern from the computation results of the computing machine 33, 3
Reference numeral 5 is a memory that is a storage unit that can be read from the computing unit 33.

In the refrigeration cycle control device configured as described above, the frequency of the compressor 1 is changed by the inverter 4 by the inverter 4 under the standard indoor / outdoor temperature conditions of cooling and warming.
The rotation speed of the blower 25 attached to the inverter 28
The blower 2 attached to the outdoor heat exchanger 26 by
An experiment was carried out in which the rotation speed of No. 7 was changed individually by the inverter 30, and by this experiment, the frequency change amount ΔF of the compressor 1, the rotation speed change amount ΔNi of the indoor blower 25,
And the ratio of the capacity change amount ΔQ of each indoor heat exchanger 24 to the rotation speed change amount ΔN of the outdoor blower 27 are set as empirical constants a, b, and c, and the frequency change amount Δ of the compressor 1 is also set.
F, the ratio of the total input change amount ΔW of each drive device (compressor 1, indoor blower 25, and outdoor blower 27) of the refrigeration system to the rotation speed change amount ΔNi of the indoor blower 25 and the rotation speed change amount ΔN of the outdoor blower 27. The empirical constants d, e,
The empirical constants obtained in advance are stored in the memory 35 as preset empirical constants af.
In the actual machine, this preset empirical constant a ~
Based on f, the computing unit 33 determines that the inverters 4, 28,
The frequency of the compressor 1 controlled by 30, the rotational speed of the indoor blower 25, and the expected rotational speed change of the outdoor blower 27 with respect to the respective expected rotational speed changes, the heat exchange capacity change amount ΔQ of the indoor heat exchanger 24, and the refrigeration system. The total input change amount ΔW of each drive device is calculated from the matrix calculation formula.

Next, as shown in FIG. 2, based on the matrix calculation result of the calculator 33 and a preset judgment standard (detailed later), the judge 34 determines that the heat of the indoor heat exchanger 24 has been exceeded. The frequency of the compressor 1 and the rotation of the indoor blower 25 that keep the exchange capacity within a predetermined range and minimize the total input W of each drive device (compressor 1, indoor blower 25, and outdoor blower 27) of the refrigeration system. Number, and outdoor blower 2
The combination of the rotation speeds of 7 is judged and selected, and the judgment / selection result is transmitted to the controllers 32, 29, 31 of the respective inverters. Therefore, the frequency of the compressor 1 of the judgment result selected by correlating and combining with each other. , The number of revolutions of the indoor blower 25, and the number of revolutions of the outdoor blower 25, the controllers 32, 29, 31 of the respective inverters control the inverters 4, 28, 3 respectively.
By controlling 0, the total input W of the drive equipment of the refrigeration system is minimized while maintaining the heat exchange capacity of the indoor heat exchanger 24 within a predetermined range.

It should be noted that while maintaining the heat exchange capacity of the indoor heat exchanger within a predetermined range, the heat transfer area of the indoor heat exchanger is always constant if the model is selected. The heat exchange capacity of the air conditioner is determined by the temperature difference between the indoor temperature and the indoor heat exchanger temperature and the rotation speed (wind speed) of the indoor blower, and is maintained within the predetermined range of the judgment standard as described above. Even if the indoor load (temperature difference) changes due to changes in the room's cold / warm set temperature, the opening / closing of the indoor door, and the number of people in the room, the indoor blower minimizes the input of the indoor blower in response to this change. Is calculated within a predetermined range of heat exchange capacity, and the calculation result and a preset judgment standard (for example, 10 ° C. during cooling operation, 5 minutes after cooling operation)
℃, heating operation 12 ℃, heating operation 5 minutes later 6 ℃, etc.), the indoor blower rotation speed is the rotation speed that minimizes the input of the indoor blower. It goes without saying that it means being controlled. Also, if the rotation speed of the indoor blower is determined and the low pressure becomes constant, the work of the compressor when the low pressure is constant is determined by the high pressure determined by the capacity of the outdoor heat exchanger. The capacity of the air conditioner is determined by the temperature difference between the outdoor temperature and the outdoor heat exchanger temperature and the number of revolutions (wind speed) of the indoor blower, similar to the logic until the capacity of the indoor heat exchanger is determined. However, since the capacity of the outdoor heat exchanger is not maintained within a predetermined range, a criterion for minimizing the sum of the work of the compressor and the input of the outdoor blower is added to the criterion for setting, and Realize the details. The input to the compressor is the work of the compressor times the rotation speed of the compressor.

The processing in the arithmetic unit 33 and the judging unit 34 will be described with reference to the block diagram of FIG. First, the basic change amount of F (compressor frequency), Ni (indoor blower rotation speed), No (outdoor blower rotation speed) with respect to the indoor heat exchanger capacity Q required by the air conditioner is calculated in the same manner as the conventional method. To decide. Next, by performing a matrix operation with a computing device, there are 27 ways (described later) of ΔF (compressor frequency change width), ΔN
A combination of i (internal heat exchanger side blower rotation speed change width) and ΔNo (outdoor heat exchanger side blower rotation speed change width) is obtained. Then, ΔF, ΔNi, which minimizes the total input W while maintaining the capacity Q (the capacity is within a certain range) by the judgment device.
Judge and select the combination of ΔNo, add to the basic change,
Output.

The flow of processing will be described below with reference to the flow charts of FIGS. 3 and 4, including the concept of one embodiment of the matrix operation described above. First, in FIG. 3, the change amount of the compressor frequency is ΔF, the change amount of the indoor blower rotation speed is ΔNi, the change amount of the outdoor blower rotation speed is ΔNo, and the change amounts of these actuators are ΔF, ΔNi, and ΔN.
Change only o. However, these changes take one of the following values. ΔF = −α, 0, + α ΔNi = −β, 0, + β ΔNo = −γ, 0, + γ Then, since ΔF, ΔNi, and ΔNo change in three ways, respectively, 3 × 3 × 3 or 27 Street (Δ
F, ΔNi, ΔNo) can be combined. Therefore, by using the 27 combination results and the empirical constants a to f previously obtained by experiment or calculation and stored in the memory 35, the arithmetic unit 33 calculates the following equations to correspond to the 27 combinations. The capacity change amount ΔQ of the indoor heat exchanger and the total input change amount ΔW of the device are obtained.

[Equation 1]

Next, from the 27 combinations of (ΔQ, ΔW), the one having the minimum input while maintaining the capability (capacity within a certain range) as shown in FIG. 4 is judged. 33 determines / selects one set based on a preset determination condition. Then, this result is transmitted to the controllers 32, 29, 31 of the inverters attached to the compressor 1, the indoor blower 25, and the outdoor blower 27, respectively, so that the controllers pass through the respective inverters 4, 28, 30. Each actuator (compressor 1 or blower 25, 2
7 rotation speed).

Here, as a simple example, a case where the number of revolutions Ni of the indoor blower 25 is not changed and the cooling operation is performed at a low outside temperature will be described. When the frequency change amount ΔF of the compressor 1 and the rotation speed change amount ΔNo of the outdoor blower 27 are changed in three ways and nine ways, respectively, the results are shown in FIG. Here, ΔF and ΔNo
The change amount of the compressor frequency F is set to α = 1 [Hz], and the change amount of the outdoor heat exchanger rotation number No is set to β = 50 [rpm] so that the change of the heat exchanger has the same effect on the capacity and the input. Further, if (ΔF, ΔNo) = (0, 0) is shown at the origin of FIG. 5, it is smaller than that when the input is the origin (0, 0) in FIG. 5 (ΔF, ΔNo). There are 4 combinations of (-1, -50), (-1, 0), (-1, 50), (0, 50) There are two combinations of (-1,0) and (1,0). Therefore, the combination that minimizes the input while maintaining the heat exchange capacity at ± δ is (ΔF, ΔNo) = (− 1,0), and the corresponding rotation speed change commands for the compressor 1 and the blower 27 are It is sent to the controllers 32, 29, 31 and controlled.

Here, in order to simplify the concept of the present invention, a specific example of the case where the indoor blower rotation speed is not changed is described, but the case where all three of ΔF, ΔNi, and ΔNo are changed is also described. The same can be said, in that case, a combination that minimizes the total input while maintaining the capability is selected from 27 ways as shown in FIG. Further, in the present embodiment, the inverter is used to change the rotation speed of the blower, but there is no problem even if it is implemented by a variable means to which another thyristor or the like is applied.

Example 2. In the present embodiment, although not shown, the control device of the first embodiment detects the temperature difference between the indoor temperature and the indoor set temperature, and sends the detection result to the inverter controllers 32, 29, 31 of the present embodiment. The indoor thermometer, which is a characteristic detection thermometer, is added. With such a configuration, the inverter controllers 32, 29, and 31 of the present embodiment, which have received the detection result of the indoor thermometer and the judgment result from the judgment machine 34 described in the first embodiment, are detected by the indoor thermostat. As a result, when a signal is received in which the temperature difference between the indoor temperature and the indoor set temperature exceeds a predetermined value, the preset frequency of the compressor 1 that maintains the heat exchange capacity of the indoor heat exchanger 24 at the maximum, and the indoor blower 25. When the inverters 4, 28 and 30 are controlled based on the rotation speed of the outdoor fan 27 and the rotation speed of the outdoor blower 27 and a signal in which the difference between the indoor temperature and the indoor set temperature is within a predetermined value is received, As explained in
The frequency of the compressor 1 and the indoor blower 25 that minimize the total input W of each drive device of the refrigeration system while maintaining the heat exchange capacity of the indoor heat exchanger 24, which is the determination result from the determination device 34, within a predetermined range. The inverters 4, 28, 30 are controlled on the basis of the number of revolutions and the number of revolutions of the outdoor blower 27. Therefore, in the present embodiment, the effect of the first embodiment can be obtained, and the refrigeration cycle control device can be obtained in which the room temperature quickly becomes a comfortable cooling / heating temperature and energy efficiency is high.

Whether or not a predetermined time has elapsed after the operation start signal of the refrigeration system is received as the characteristic signal corresponding to the temperature difference between the indoor temperature detected by the characteristic detection thermometer and the indoor set temperature, Even if you use the signal
Similar to the above, a refrigeration cycle control device with a simple control circuit, a comfortable cooling / heating temperature can be obtained speedily, and energy efficiency is almost good can be obtained.

Example 3. FIG. 7 is a configuration diagram of the refrigeration cycle control device according to the third embodiment. 12 is a current sensor that detects the input of the compressor 1 (inverter 4) by converting it from this current, and 36 is the input of the indoor blower 25. , A current sensor for converting and detecting from this current, 37 a current sensor for converting and detecting the input of the outdoor blower 27 from this current, 38
Is a pressure sensor for detecting the refrigerant pressure in the indoor heat exchanger 24,
Reference numeral 39 is a pressure sensor for detecting the refrigerant pressure in the outdoor heat exchanger 26, and the other components are as described in the second embodiment. Instead of the pressure sensor 38 or 39, a temperature sensor that detects the saturation temperature of the refrigerant corresponding to the refrigerant pressure of the indoor heat exchanger 24 or the outdoor heat exchanger 26 may be used.
Further, as will be described later, the pressure sensors 38 and 39 are
Since it is for detecting the capacity of the indoor heat exchanger 24, which is the refrigerating capacity of the compressor 1, the inlet / outlet port determined by the inlet / outlet temperature difference from the temperature difference sensor detecting the inlet / outlet temperature difference of the indoor heat exchanger 24. Enthalpy difference and indoor heat exchanger 2
4 may be combined with the number of rotations of the compressor 1 that determines the refrigerant circulation amount of the compressor 1, which is the refrigerant flow rate of No. 4.

In the present embodiment in which the refrigeration system is configured as described above, the input of the inverter 4 detected by each current sensor 12, 37, 38, the input of the indoor blower 25, the input of the outdoor blower 27, and the pressure The set empirical constants a to f described in the first embodiment, the compressor, and the capacity of the indoor heat exchanger 24, which are determined from the refrigerant pressures of the indoor heat exchanger 24 and the outdoor heat exchanger 26 detected by the sensors 38 and 39, are described. 1, the input of the inverter 4, the input of the indoor blower 25, the input of the outdoor blower 27, which are obtained by the calculation result of the rotation speed change assumed by the indoor blower 25 and the outdoor blower 27 and the determination condition,
And the heat exchange capacity Q of the indoor heat exchanger 24, and when this comparison result exceeds a predetermined value (for example, 5%), it is determined that a trouble such as detection has occurred, and the experience obtained by experiments This constant a is not changed without changing the constants a to f
~ F based on the controller 32, 29, 31 of each inverter
Controls each inverter 4, 28, 30.

When the comparison result is within a predetermined value (5%), each input of the inverter 4, the indoor blower 25, and the outdoor blower 27 detected by each current sensor 12, 37, 38, and the pressure sensor. The capacity of the indoor heat exchanger 24 determined from the refrigerant pressures detected by 38 and 39, the frequency of the compressor 1 currently controlled by each inverter 4, 28 and 30, the rotation speed of the indoor blower 25, and From the rotation speed of the outdoor blower 25, based on the following formula, a to f
And the controllers 32, 29, 31 of the respective inverters control the respective inverters 4, 28, 30 based on the recalculated a to f, and the recalculated a to f are tested. It is replaced with the empirical constants a to f obtained by the above and stored in the memory 35. a = ΔQ / ΔF, b = ΔQ / ΔNi, c = ΔQ / ΔNo ... d = ΔW / ΔF, e = ΔW / ΔNi, f = ΔW / ΔNo From the following control, the stored a to f are stored. Based on this, the above operation is repeated.

Therefore, in this embodiment, foreign matter adheres to and deposits on the heat transfer surface of the indoor heat exchanger or the outdoor heat exchanger, and the performance of the indoor heat exchanger or the outdoor heat exchanger decreases due to aging. Also, even if the flow of air blown by each heat exchanger changes depending on the customer installation conditions of the refrigeration system, the rotation speed of each drive device is controlled by the correction setting empirical constants a to f corresponding to this change. Therefore, the effect of the second embodiment is controlled accurately and stably for a long period of time.

Example 4. In the present embodiment, for each combination temperature of the indoor temperature and the outdoor temperature (outside air temperature), the frequency of the compressor 1, the rotation speed of the indoor blower 25, and the rotation speed of the outdoor blower 27 of the respective indoor heat exchangers 24 are changed. The rate of capacity change and the rate of total input change of each drive device of each refrigeration system are set as empirical constants a to f, and FIG.
It asks like 0. Although not shown in the figure, the control device of the second embodiment detects the indoor temperature and transmits the detected temperature to the determining device 34 of the present embodiment, and the outdoor temperature sensor detects the outdoor temperature. An outdoor temperature sensor for transmitting the temperature to the determination device 34 of the present embodiment is added.

With this configuration, the arithmetic unit 33 of the present embodiment performs an arithmetic operation based on the above-mentioned set empirical constants a to f, and sends the arithmetic result to the judgment unit 34 of the present embodiment. Further, the judging device 34 of the present embodiment which receives signals from the arithmetic unit 34, the indoor temperature sensor, and the outdoor temperature sensor.
Is determined from the calculation result of the calculator 34 based on the detected temperatures of the indoor temperature sensor and the outdoor temperature sensor and the preset determination criteria.

The subsequent operation is as described in the second embodiment. Therefore, in this embodiment, in addition to having the effect of the second embodiment, in addition to the change in the indoor temperature and the outdoor temperature,
It is possible to obtain a highly reliable refrigeration cycle control device that follows with higher accuracy.

Example 5. In the present embodiment, the judgment device 34 of the first, second or third embodiment makes a judgment by taking a weighting function, which will be described later, into consideration as a judgment criterion. Compressor frequency change Δ
F, an empirical factor is incorporated in determining the indoor blower rotation speed change amount ΔNi and the outdoor blower rotation speed change amount ΔNo. The configuration of this device is similar to that of FIG. Now, the weighting function for the cooling capacity or the heating capacity (heat exchange capacity of the indoor heat exchanger) is ω ₁ (function of the cooling capacity or heating capacity), and the weighting function for the sum of the inputs is ω ₂ (function of the input). The index ω defined by the formula is introduced. ω = ω ₁ × ω ₂ ... ω = (p × ω ₁ + q × ω ₂ ) / (p + q) (where p and q are weighting factors) Which system is to be adopted depends on the system. However, at this time, so that ω becomes maximum (Δ
By selecting a combination of (F, ΔNi, ΔNo), an empirical sensation can be introduced at the time of determining the weighting functions ω ₁ and ω ₂ , and finer control can be performed.

For example, the case of the first embodiment can be expressed by this method as shown in FIG. That is, if the capacity change is in the range of ± δ, ω ₁ = 1 otherwise, ω ₁ = 0. If the total input change is larger than 0, ω ₂ = 0 otherwise, ω ₂ = 0.5 Therefore, if ω is calculated using the formula, the result will be 0 if either value is 0, and ω is 0 only when the capacity change is within ± δ and the input change is 0 or less. Will have a value other than. Then, ω is maximum when the input is the minimum, so that combination is selected and output. Similarly, when introducing a more experiential sense, for example, first try to put the image into words. It doesn't matter if the ability is too big, but not too small. The input can be as small as you like.

By plotting this image, a distribution diagram of the weighting functions ω ₁ and ω ₂ as shown in FIG. 9 can be obtained. According to this FIG. 9, if the change in capability is −δ or less, ω ₁ = 0, and if the change in input is greater than 0, then ω ₂ = 0. The part has values as shown in FIG. After that, the formula or ω is calculated based on the formula, but since the usage of the formula has been described above, the formula is used here. The formula is, for example, to maximize the capacity when the air conditioner is started, so to make p larger than q, or to make the input as small as possible even if the load is light and the capacity changes, set q to p. This is an effective judgment method when the judgment conditions are changed depending on the operating conditions of the system, such as increasing the size.

[0037]

[Effects of the Invention] The calculation results in which the rotational speeds of the respective drive devices that determine the total power consumption of the refrigeration system are correlated with each other by a preset empirical constant are compared with the set judgment criteria, and the control is performed based on the comparison result. Therefore, even if the outdoor load changes due to weather conditions such as rain, wind, and snow, the indoor load also changes due to changes in the indoor cold / warm set temperature, the opening and closing of the indoor doors, and the number of people in the room. Even so, a highly reliable refrigeration cycle control device can be obtained in which the control flow is smoothly advanced following this change, the refrigeration cycle is speedily stabilized, and the total power consumption of the refrigeration system is minimized.

Further, the calculation results obtained by correlating the rotational speeds of the respective drive devices with each other by a preset empirical constant are compared with the set judgment criteria, and the comparison result and the room temperature of the characteristic detection thermometer are compared. Based on the characteristic signal corresponding to the temperature difference from the set temperature, when the characteristic signal corresponding to the temperature difference exceeds a predetermined value, the indoor heat exchanger is controlled to maximize the heat exchange capacity, and the temperature When the characteristic signal corresponding to the difference is within the specified value, the heat exchange capacity of the indoor heat exchanger is controlled within the specified range and the total input of each drive device is controlled to be the minimum. Even if the load changes, the control flow smoothly follows this change, the indoor temperature quickly and comfortably becomes the cooling / heating temperature, the refrigeration cycle is stabilized quickly, and the total power consumption of the refrigeration system is reduced. High refrigeration cycle controller reliable to small are obtained.

In addition, the learning function section uses preset empirical constants as high voltage values for detecting the electric characteristic sensors for detecting the electric characteristic values corresponding to the inputs of the driving devices and the heat exchange capacity of the indoor heat exchanger. And comparing each detection result of the ability detection sensor corresponding to the low pressure sensor and the determination result of the determination unit, and when the comparison result exceeds a predetermined value, the preset empirical constant is not corrected and the comparison result is When it is within the specified value, it is corrected by substituting it with an empirical constant calculated based on each detection result of each electric characteristic sensor and each performance characteristic value force sensor. Even if the performance of the indoor heat exchanger or the outdoor heat exchanger changes, or the installation conditions change, due to the accumulation of foreign matter on the heat transfer surface of
A highly reliable refrigeration cycle control device that can follow these changes and perform stable control can be obtained.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a refrigeration cycle control device showing an embodiment of the present invention.

FIG. 2 is a block diagram showing the operation of the present invention.

FIG. 3 is an operation flowchart showing an operation procedure of the present invention.

FIG. 4 is a determination flowchart showing a determination procedure of the present invention.

FIG. 5 is a diagram showing a capacity change and an input change when only the compressor frequency and the outdoor blower rotation speed are changed.

FIG. 6 is a capacity / input change diagram showing a capacity change and an input change with respect to changes in compressor frequency, indoor blower rotation speed, and outdoor blower rotation speed.

FIG. 7 is a configuration diagram of a refrigeration cycle control device according to a third embodiment of the present invention.

FIG. 8 is a diagram showing experience determination conditions of the present invention.

FIG. 9 is a diagram showing determination conditions according to another embodiment of the present invention.

FIG. 10 is a diagram showing changes in the constant a with respect to changes in compressor frequency, indoor blower, outdoor blower, indoor temperature, and outside air temperature.

FIG. 11 is a configuration diagram of a conventional refrigeration cycle control device.

[Explanation of symbols]

 1 Compressor 4 Inverter 12 Current sensor 21 Four-way valve 22 Accumulator 23 Throttle mechanism 24 Indoor heat exchanger 25 Indoor fan 26 Outdoor heat exchanger 27 Outdoor fan 28 Inverter 29 Controller 30 Inverter 31 Controller 32 Controller 33 Arithmetic unit 34 Judgment Machine 35 Memory 36 Current sensor 37 Current sensor

Front page continuation (72) Inventor Toshihiko Enomoto 3-18-1, Oga, Shizuoka-shi Shizuoka Manufacturing Co., Ltd. (72) Inventor Yuji Shibata 3--18-1, Oka Shizuoka Shizuoka Manufacturing (72) Inventor Takayuki Yoshida 3-18-1, Oga, Shizuoka City Mitsubishi Electric Co., Ltd.

Claims (5)

[Claims] 1. A refrigerating apparatus section in which a compressor having a built-in electric motor, an outdoor heat exchanger having an outdoor blower, a throttle mechanism, and an indoor heat exchanger having an indoor blower are sequentially connected by piping, and the refrigerating apparatus. Of the compressor, the indoor blower, and the outdoor blower, and a storage unit for storing preset empirical constants in the control unit, and a storage of the storage unit. Based on the set empirical constants, a calculation unit that calculates the heat exchange capacity of the input of each drive device and the indoor heat exchanger for each rotation speed change of the drive device, the calculation result of this calculation unit, and Rotation between the above-mentioned driving devices is compared with a set judgment criterion, and the heat exchange capacity of the indoor heat exchanger is maintained within a predetermined range based on the comparison result, and the total input of each driving device is minimized. A refrigeration cycle control device comprising: a determination unit that determines a number combination; and a control unit that controls the number of rotations of each drive device based on the determination result of the determination unit. 2. A refrigerating apparatus section in which a compressor having a built-in electric motor, an outdoor heat exchanger having an outdoor blower, a throttling mechanism, and an indoor heat exchanger having an indoor blower are sequentially connected by piping, and the refrigerating apparatus. A compressor, the indoor blower, and a control device for controlling each drive device of the outdoor blower, the control device detects a characteristic signal corresponding to a temperature difference between the indoor temperature and the indoor set temperature. A characteristic detection thermometer, a storage unit that stores a preset empirical constant,
A computing unit for computing the input of each driving device and the heat exchange capacity of the indoor heat exchanger with respect to each rotation speed change of the driving device based on the set empirical constant stored in the storage unit, and this computing unit. Comparing the calculation result of the above with a preset judgment criterion, maintaining the heat exchange capacity of the indoor heat exchanger within a predetermined range from the comparison result, and minimizing the total input of each driving device. When the characteristic signal corresponding to the temperature difference exceeds a predetermined value based on the determination unit that determines the rotational speed combination between the drive devices and the determination result of the determination unit and the detection result of the characteristic detection thermostat, the indoor heat The rotation speed of each drive device is controlled by each preset rotation speed that maximizes the heat exchange capacity of the exchanger, and when the characteristic signal corresponding to the temperature difference is within a predetermined value, the determination unit Judgment result Based on the refrigeration cycle control apparatus characterized by comprising a control unit for controlling the respective rotational speed of the respective drive devices. 3. The control device corresponds to each electric characteristic sensor for detecting each electric characteristic value corresponding to an input of each drive device, and a high pressure and low pressure sensor for detecting a heat exchange capacity of the indoor heat exchanger. Comparing the detection results of the capability detection sensor and the detection results of the capability detection sensor and the electrical characteristic sensors with the determination result of the determination unit, and when the comparison result exceeds a predetermined value, the setting stored in the storage unit is set. When the comparison result is within a predetermined value without correcting the empirical constant, the experience that the set empirical constant stored in the storage unit is calculated based on the detection results of the electric characteristic sensors and the capacity characteristic value sensors. The refrigeration cycle control device according to claim 1 or 2, further comprising a learning function unit that replaces a constant and corrects the constant. 4. The control device includes an indoor temperature sensor for detecting an indoor temperature and an outdoor temperature sensor for detecting an outdoor temperature, and the judging section determines the indoor temperature sensor and the outdoor temperature from the calculation result of the calculating section. The refrigeration cycle control device according to claim 3, wherein the determination is performed based on the temperature detected by the sensor and a preset determination criterion. 5. The determination unit makes a determination by taking into consideration the heat exchange capacity of the indoor heat exchanger and each weighting function for the total input of each drive device in the determination criterion.
The refrigeration cycle control device according to the item.