JP2002147875A - Refrigeration apparatus and method of controlling capacity thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a refrigeration apparatus wherein temperature of discharged air is prevented from excessively rising due to increase of high-low difference at a low outdoor temperature and rise of input accompanying excessive suppression of a capacity is prevented from occurring. SOLUTION: The refrigeration apparatus of the present invention comprises a compressor 1, a condenser 2, a throttling section 3 and an evaporator 4, that are connected to communicate with each other by refrigerant piping, and the capacity of a fan is controlled on the condenser 2, using an air-refrigerant heat exchanger. The apparatus further comprises a condensing temperature detecting part 9 for detecting condensing temperature of the condenser 2, an evaporating temperature detecting part 10 for detecting evaporating temperature of the evaporator 4 and a capacity control part 11 for controlling the capacity of the fan 5, in such a manner as to make the condensing temperature substantially match the target condensing temperature changing according to the evaporating temperature.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerating apparatus for controlling an air volume, and more particularly to a refrigerating apparatus for controlling an air volume of a blower in order to control a capacity of a condenser having an air-refrigerant heat exchanger. , And a method of controlling the air volume thereof.

[0002]

2. Description of the Related Art A conventional refrigeration system will be described below. FIG. 13 is a diagram illustrating a configuration of a conventional refrigeration apparatus including a condenser using an air-refrigerant heat exchanger. In FIG. 13, 1 is a compressor, 2 is a condenser, 3 is a throttle unit, 4 is an evaporator, 5 is a blower, 6 is an air volume control unit, and 9 is a condensing temperature. It is a detection unit.

[0003] For example, in the above-mentioned refrigerating apparatus, blower air volume control of the condenser 2 is generally performed. The purpose of the air volume control is, firstly, to obtain the condensing capacity according to the required capacity, and secondly, to improve the instability of the operation due to the lowering of the condensing pressure and the lowering of the evaporating pressure when the suction temperature of the condenser 2 is low. Third, in order to forcibly operate at a higher condensing pressure, and thirdly, to suppress wind noise of the blower 5 at night,
Forcing operation at low air flow, ie higher condensing pressure,
Is raised.

[0004] The air flow rate control method used is as follows.
The following method is common. First, as a first method, for example, there is a method of controlling the air flow according to the suction temperature of the condenser 2 (hereinafter, referred to as a condenser suction temperature control method). FIG. 14 is a diagram illustrating a first air volume control method.
In this method, as shown in FIG. 14A, control is performed so as to increase the air volume of the blower 5 as the suction temperature of the condenser 2 increases. More specifically, control is performed so that the rotation speed of the fan is increased by phase control, inverter control, or the like. By this control, the relationship between the evaporation temperature and the condensation temperature is shown in FIG.
As shown in (b), the operating point shifts in the direction of increasing the condensing temperature.

[0005] As a second method, there is a method of controlling the air volume according to the condensation temperature (hereinafter, referred to as a condensation temperature control method). FIG. 15 is a diagram illustrating a second air volume control method.
In this method, as shown in FIG. 15A, the air volume of the blower 5 is directly determined from the condensation temperature. More specifically, the relationship between the evaporation temperature and the condensation temperature as shown in FIG. 15B is obtained by previously measuring and setting the relationship between the condensation temperature and the required blower air volume according to the type of the refrigeration equipment. Is obtained.

As a third method, there is a method of controlling the air flow so that the condensing temperature or the high pressure corresponding thereto substantially matches the target value (hereinafter, referred to as a condensing temperature constant control method). FIG. 16 is a diagram illustrating a third air volume control method.
In this method, the relationship between the evaporation temperature and the condensation temperature as shown in FIG. 16 is obtained. When the suction temperature of the condenser 2 is lower than the predetermined value, the air volume control unit 6 may perform the intermittent operation between the stop state and the minimum air volume operation state.

[0007]

SUMMARY OF THE INVENTION However,
The conventional refrigeration system has the following problems.
First, in the condenser suction temperature control method, since the control amount is tuned to ensure stable operation when the suction temperature is low and the evaporation temperature is low, there is a tendency to control the air flow in a direction to suppress the air flow. For this reason, even when an operation with a large air volume is possible, there is a case where a high pressure level is high, a compressor load is large, and an operation with a large input is forced.

In the condensing temperature control method, the relationship between the condensing temperature and the air flow is uniquely determined and controlled by matching confirmation for each model by a confirmation test, so that an adjustment load is generated for each model development. In addition, since the control stability with respect to a temporal change such as a power supply environment and contamination of the condenser is insufficient, the refrigeration capacity may not be stable due to repeated hunting of the condensing temperature and the air volume.

Further, in the condensing temperature constant control method, since the condensing temperature is controlled to be constant irrespective of the evaporating temperature, when the evaporating temperature is low, the discharge-suction differential pressure of the compressor becomes large, and the discharging temperature becomes low. As a result, the compressor may need to be separately controlled for protection.

The present invention has been made in view of the above, and has a refrigeration apparatus that does not cause an excessive rise in discharge temperature due to an increase in the height difference at low outside air, and an increase in input due to an increase in high pressure due to excessive suppression of air volume. The purpose is to obtain an air flow control method.

[0011]

Means for Solving the Problems The above-mentioned problems are solved,
In order to achieve the object, in the refrigeration apparatus according to the present invention, a compressor, a condenser, a throttle device, and an evaporator are communicated with a refrigerant pipe, and an air-refrigerant heat exchanger is used for the condenser. A condensing temperature detecting unit (corresponding to a condensing temperature detecting unit 9 in an embodiment described later) for detecting a condensing temperature of the condenser, and an evaporating temperature detecting unit for detecting an evaporating temperature of the evaporator. Means (corresponding to the evaporating temperature detecting unit 10), and an air flow controlling means (adjusting the air flow controlling unit 11) for adjusting the air flow of the blower so that the condensing temperature substantially matches a condensing temperature target value which changes according to the evaporating temperature. ).

[0012] In the refrigeration apparatus according to the next invention,
A compressor, a condenser, a throttle device, and an evaporator are communicated with each other via a refrigerant pipe, and the air-refrigerant heat exchanger is configured to control the air flow of the blower with respect to the condenser, and to detect the condensation temperature of the condenser. Temperature detecting means, evaporating temperature detecting means for detecting the evaporating temperature of the evaporator, suction air temperature detecting means for detecting the suction air temperature of the condenser (corresponding to the suction air temperature detecting section 12), and the condensing temperature And an air volume control means (corresponding to the air volume control unit 13) for adjusting the air volume of the blower so that the air temperature substantially matches a condensation temperature target value that changes according to the evaporation temperature and the suction air temperature. I do.

In a refrigeration apparatus according to the next invention,
A compressor, a condenser, a throttle device, and an evaporator are communicated with each other via a refrigerant pipe, and the air-refrigerant heat exchanger is configured to control the air flow of the blower with respect to the condenser, and to detect the condensation temperature of the condenser. Temperature detecting means, suction air temperature detecting means for detecting a suction air temperature of the condenser, and evaporating temperature estimating means for estimating an evaporating temperature based on the condensing temperature, the suction air temperature and the current air volume (evaporating temperature (Corresponds to the estimation unit 14)
And air volume control means for adjusting the air volume of the blower such that the condensing temperature substantially matches a condensing temperature target value that changes in accordance with the evaporation temperature and the suction air temperature.

In the refrigeration apparatus according to the next invention,
A compressor, a condenser, a throttle device, and an evaporator are communicated with each other via a refrigerant pipe, and the air-refrigerant heat exchanger is configured to control the air flow of the blower with respect to the condenser, and to detect the condensation temperature of the condenser. Temperature detecting means, suction air temperature detecting means for detecting a suction air temperature of the condenser, evaporating temperature estimating means for estimating an evaporating temperature based on the condensing temperature, the suction air temperature, and a current air volume; Air flow control means for adjusting the air flow of the blower so that the temperature substantially matches the condensation temperature target value that changes according to the evaporation temperature.

In the refrigeration apparatus according to the next invention,
A compressor, a condenser, a throttle device, and an evaporator are communicated with each other via a refrigerant pipe, and the air-refrigerant heat exchanger is configured to control the air flow of the blower with respect to the condenser, and to detect the condensation temperature of the condenser. Temperature detection means, suction air temperature detection means for detecting the suction air temperature of the condenser, and the air volume of the blower such that the condensation temperature substantially matches a condensation temperature target value that changes according to the suction air temperature. Air flow control means (corresponding to the air flow control unit 15) for adjustment.

In the air volume control method according to the next invention, a condensing temperature detecting step for detecting a condensing temperature of a condenser, an evaporating temperature detecting step for detecting an evaporating temperature of an evaporator, And an air volume control step (corresponding to steps S1 to S9) of adjusting the air volume of the blower so as to substantially match the condensation temperature target value that changes according to the temperature.

In the air volume control method according to the next invention, a condensing temperature detecting step for detecting a condensing temperature of the condenser, an evaporating temperature detecting step for detecting an evaporating temperature of the evaporator, and a suction air temperature of the condenser And a flow control step for adjusting the flow rate of the blower so that the condensing temperature substantially matches a condensing temperature target value that changes according to the evaporating temperature and the suction air temperature (steps S11 to S11). (Equivalent to S19).

In the air volume control method according to the next invention, a condensing temperature detecting step for detecting a condensing temperature of the condenser, a suction air temperature detecting step for detecting a suction air temperature of the condenser, An evaporating temperature estimating step of estimating an evaporating temperature based on the suction air temperature and the current air volume (corresponding to step S21); and a condensing temperature target value in which the condensing temperature changes according to the evaporating temperature and the suction air temperature. And an air volume control step (corresponding to steps S22 to S30) of adjusting the air volume of the blower so as to substantially match the above.

In the air volume control method according to the next invention, a condensing temperature detecting step for detecting the condensing temperature of the condenser, and an evaporating temperature estimating step for estimating the evaporating temperature based on the condensing temperature and the current air volume are provided. And an air volume control step of adjusting the air volume of the blower so that the condensing temperature substantially matches a condensing temperature target value that changes according to the evaporation temperature.

In the air volume control method according to the next invention, a condensing temperature detecting step for detecting the condensing temperature of the condenser, a suction air temperature detecting step for detecting the suction air temperature of the condenser, An air volume control step of adjusting an air volume of the blower so as to substantially match a condensation temperature target value that changes according to the suction air temperature.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a refrigeration apparatus and an air flow control method according to the present invention will be described below in detail with reference to the drawings. The present invention is not limited by the embodiment.

Embodiment 1 FIG. 1 is a diagram illustrating a configuration of a refrigeration apparatus according to a first embodiment of the present invention. In FIG. 1, 1 is a compressor, 2 is a condenser by an air-refrigerant heat exchanger, 3 is a throttle, 4 is an evaporator, 5 is a blower, and 9 is a high pressure detection. A condensing temperature detecting unit having a / conversion function, an evaporating temperature detecting unit 10 having a low pressure detection / conversion function, and an air flow control unit 11 are shown.

In the refrigerating apparatus, the blower 5 is controlled so that the condensing temperature detected by the condensing temperature detecting section 9 substantially coincides with the target condensing temperature which changes according to the evaporating temperature detected by the evaporating temperature detecting section 10. Adjust the air volume.

Here, a method of controlling the air volume in the air volume control unit 11 will be described. FIG. 2 is a diagram showing the relationship between the condensing temperature and the evaporating temperature in the first embodiment.
5 is a flowchart illustrating an air volume control method according to the first embodiment. In FIG. 3, the detection value of the condensation temperature detection unit 9 is “CT”, and the detection value of the evaporation temperature detection unit 10 is “ET”.

First, in the air volume control unit 11, based on FIG. 2, the condensing temperature (C) that changes according to the evaporation temperature (ET) is set.
T) Target value: CTm is set (step S1). Then, the condensing temperature detected by the condensing temperature detecting section 9 is compared with a condensing temperature target value (step S2).

For example, when the condensing temperature is equal to or higher than the condensing temperature target value (step S2, Yes), the air volume control unit 11 increases the air volume by a predetermined amount (step S3), and the air volume does not exceed the max value. It is determined whether or not (step S4). If the air volume exceeds the max value (step S4, Yes), the air volume is fixed at the max value (step S5), and the process shifts to the wait state (step S9). If the air volume is equal to or less than the max value (step S4, No), the flow shifts to the wait state with the current air volume maintained (step S9). In step S9, the process proceeds to step S1 after a predetermined time has elapsed.

On the other hand, when the condensing temperature is lower than the condensing temperature target value (step S2, No), the air volume control unit 11 reduces the air volume by a predetermined amount (step S6), and the air volume does not fall below the min value. It is determined whether or not (Step S7). If the air volume is lower than the min value (step S7, Yes), the air volume is fixed at the min value (step S8), and the process shifts to the wait state (step S9). When the air volume is equal to or more than the min value (step S
(7, No) shifts to the wait state with the current air volume maintained (step S9).

The dotted line in FIG. 2 indicates that the air volume is min.
4 shows the behavior of the condensing temperature / evaporating temperature when the condensing temperature cannot controlly match the condensing temperature target value when it hits the / max value.

As described above, in the present embodiment, the condensing temperature detected by the condensing temperature detecting section substantially matches the condensing temperature target value which changes according to the evaporating temperature detected by the evaporating temperature detecting section. In addition, since the configuration is such that the air volume of the blower is controlled, it is possible to ensure an operation state at an appropriate condensing temperature and evaporating temperature. Further, since the conventional condensing temperature control method is not used, it is possible to eliminate an adjustment load for each model development. Further, since feedback control of the condensing temperature is used, hunting can be prevented, and the refrigerating capacity can be stabilized. In addition, in a region where the evaporation temperature is low, unstable operation of the refrigeration cycle due to a decrease in the condensation temperature due to an excessive air flow can be suppressed, and an excessive rise in the discharge temperature due to an insufficient air flow can be suppressed. Further, it is possible to prevent an increase in input due to an insufficient air volume in a region where the evaporation temperature is high.

Embodiment 2 FIG. FIG. 4 is a diagram illustrating a configuration of a refrigeration apparatus according to a second embodiment of the present invention. In FIG. 4, reference numeral 12 denotes a condenser suction air temperature detection unit, and reference numeral 13 denotes an air volume control unit. Note that the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

In the refrigerating apparatus, the condensing temperature detected by the condensing temperature detecting section 9 is converted into the evaporation temperature detected by the evaporating temperature detecting section 10 and the suction air temperature detected by the condenser suction air temperature detecting section 12. The air volume of the blower 5 is adjusted so as to substantially match the target condensing temperature that changes accordingly.

Here, a method of controlling the air volume in the air volume controller 13 will be described. FIG. 5 is a diagram showing the relationship between the condensing temperature, the evaporating temperature, and the suction air temperature in the second embodiment, and FIG. 6 is a flowchart showing the air volume control method in the second embodiment. In FIG. 6, the detection value of the condensation temperature detection unit 9 is set to “CT”, and the evaporation temperature detection unit 10
Is the detected value of “ET”, and the condenser suction air temperature detector 1
The detection value of No. 2 is “AT”.

First, the air volume control unit 13 sets a target value CTm of the condensation temperature (CT) that changes according to the evaporation temperature (ET) and the intake air temperature (AT) based on FIG. 5 (step S11). ). Then, the condensing temperature detected by the condensing temperature detecting section 9 is compared with a condensing temperature target value (step S12).

For example, when the condensing temperature is equal to or higher than the condensing temperature target value (step S12, Yes), the air volume control unit 13 increases the air volume by a predetermined amount (step S13), and the air volume does not exceed the max value. It is determined whether or not (step S14). If the air volume exceeds the max value (step S14, Yes), the air volume is set to max.
The value is fixed (step S15), and a transition is made to the wait state (step S19). If the air volume is equal to or less than the max value (No in step S14), the flow shifts to the wait state with the current air volume maintained (step S19). In step S19, the process proceeds to step S11 after a predetermined time has elapsed.

On the other hand, when the condensing temperature is lower than the target condensing temperature (step S12, No), the air volume control unit 13 reduces the air volume by a predetermined amount (step S16), and the air volume does not fall below the min value. It is determined whether or not (step S17). If the air volume is lower than the min value (step S17, Yes), the air volume is fixed at the min value (step S18), and the process shifts to the wait state (step S19). If the air volume is equal to or more than the min value (No at Step S17), the flow shifts to the wait state with the current air volume maintained (Step S19).

The dotted line in FIG. 5 indicates that the air volume is min.
4 shows the behavior of the condensing temperature / evaporating temperature when the condensing temperature cannot controlly match the condensing temperature target value when it hits the / max value.

As described above, in the present embodiment, the same effect as that of the first embodiment is obtained, and further, since the configuration is such that the intake air temperature is considered in setting the condensation temperature target value, the condensation temperature is reduced. The target value can be set low according to the intake air temperature, and energy-saving operation at a lower high-pressure level can be realized.

Embodiment 3 FIG. 7 is a diagram illustrating a configuration of a refrigeration apparatus according to Embodiment 3 of the present invention. In FIG. 7, reference numeral 14 denotes an evaporating temperature estimating unit. Note that the same components as those in the first or second embodiment are denoted by the same reference numerals, and description thereof is omitted.

In the refrigerating apparatus, the evaporating temperature estimating unit 14
Estimates the evaporation temperature based on the condensation temperature detected by the condensation temperature detection unit 9, the suction air temperature detected by the condenser suction air temperature detection unit 12, and the current air volume. The air volume of the blower 5 is adjusted so as to substantially match the target condensing temperature that changes according to the evaporation temperature and the suction air temperature. Although the evaporating temperature estimating unit 14 is applied to the configuration of the second embodiment, the present invention is not limited to this.
It is good also as applying to the structure of. In this case, the evaporating temperature estimating unit 14 estimates the evaporating temperature based on the condensing temperature detected by the condensing temperature detecting unit 9 and the current air volume,
The air volume of the blower 5 is adjusted such that the condensing temperature substantially matches the target condensing temperature that changes according to the evaporation temperature.

Here, a method of controlling the air volume in the air volume control unit 13 and the evaporation temperature estimation unit 14 will be described.
FIG. 8 is a diagram showing a state of estimating the evaporation temperature according to the condensing temperature and the suction air temperature, and FIG. 9 is a flowchart showing the air volume control method according to the third embodiment. In FIG. 9, the detected value of the condensation temperature detecting unit 9 is “CT”,
The detected value of the evaporating temperature detecting unit 10 is “ET”, and the detected value of the condenser suction air temperature detecting unit 12 is “AT”.

First, the evaporating temperature estimating unit 14 calculates the current condensing temperature based on the relationship previously generated in FIG.
The current suction air temperature and the evaporation temperature according to the current air volume are estimated (step S21). Thereafter, based on FIG. 5, the air volume control unit 13 changes the condensing temperature (C) that changes according to the evaporation temperature (ET) and the suction air temperature (AT).
The target value of T): CTm is set (step S22).
Then, the condensing temperature detected by the condensing temperature detecting section 9 is compared with the condensing temperature target value (step S23).

For example, when the condensing temperature is equal to or higher than the condensing temperature target value (step S23, Yes), the air volume control unit 13 increases the air volume by a predetermined amount (step S24), and the air volume does not exceed the max value. It is determined whether or not (step S25). If the air volume exceeds the max value (step S25, Yes), the air volume is set to max.
The value is fixed (step S26), and the state shifts to the wait state (step S30). If the air volume is equal to or less than the max value (No at Step S25), the flow shifts to the wait state with the current air volume maintained (Step S30). In step S30, the process proceeds to step S21 after a predetermined time has elapsed.

On the other hand, if the condensing temperature is lower than the condensing temperature target value (step S23, No), the air volume control unit 13 reduces the air volume by a predetermined amount (step S27), and the air volume does not fall below the min value. It is determined whether or not (step S28). If the air volume is lower than the min value (step S28, Yes), the air volume is fixed at the min value (step S29), and the process shifts to the wait state (step S30). If the air volume is equal to or greater than the min value (No at Step S28), the process shifts to the wait state with the current air volume maintained (Step S30).

As described above, in the present embodiment, the same effects as those of the above-described first or second embodiment are obtained, and the evaporating temperature estimating unit further determines the current condensing temperature, the current intake air temperature, Since the evaporating temperature is estimated based on the current air volume, it is not necessary to provide an evaporating temperature detecting unit, and the cost can be reduced.

Embodiment 4 FIG. 10 is a diagram illustrating a configuration of a refrigeration apparatus according to Embodiment 4 of the present invention. FIG.
, 15 is an air volume control unit. In addition, about the structure similar to Embodiment 1-3 mentioned above, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

In the above refrigeration system, the condensing temperature detected by the condensing temperature detecting section 9 is used as the condenser suction air temperature detecting section 1.
The air flow of the blower 5 is adjusted so as to substantially coincide with the target condensing temperature that changes according to the suction air temperature detected in Step 2.

Here, a method of controlling the air volume in the air volume controller 15 will be described. FIG. 11 is a diagram illustrating a relationship among a condensing temperature, an evaporating temperature, and a suction air temperature according to the fourth embodiment, and FIG. 12 is a flowchart illustrating a flow rate control method according to the fourth embodiment. In FIG. 12, the detection value of the condensation temperature detection unit 9 is “CT”, the detection value of the evaporation temperature detection unit 10 is “ET”, and the detection value of the condenser suction air temperature detection unit 12 is “AT”. And

First, the air volume control unit 15 sets a target value: CTm of the condensation temperature (CT) that changes according to the intake air temperature (AT) based on FIG. 11 (step S3).
1). Then, the condensing temperature detected by the condensing temperature detecting section 9 is compared with the condensing temperature target value (step S3).
2).

For example, when the condensing temperature is equal to or higher than the target condensing temperature (step S32, Yes), the air volume control unit 15 increases the air volume by a predetermined amount (step S33), and the air volume does not exceed the max value. It is determined whether or not (step S34). If the air volume exceeds the max value (step S34, Yes), the air volume is set to max.
The value is fixed (step S35), and a transition is made to the wait state (step S39). If the air volume is equal to or less than the max value (No in step S34), the flow shifts to the wait state with the current air volume maintained (step S39). In step S39, the process proceeds to step S31 after a predetermined time has elapsed.

On the other hand, if the condensation temperature is lower than the condensation temperature target value (step S32, No), the air volume control unit 15 reduces the air volume by a predetermined amount (step S36), and here, the air volume does not fall below the min value. It is determined whether or not (step S37). If the air volume is lower than the min value (step S37, Yes), the air volume is fixed at the min value (step S38), and the process shifts to the wait state (step S39). If the air volume is equal to or greater than the min value (No at Step S37), the flow shifts to the wait state with the current air volume maintained (Step S39).

The dotted line in FIG. 11 indicates that the air volume is mi.
This shows the behavior of condensing temperature / evaporating temperature when the condensing temperature cannot controlly match the condensing temperature target value when the n / max value is reached.

As described above, in the present embodiment, the same effect as that of the first embodiment is obtained, and the configuration is such that the intake air temperature is considered in setting the condensation temperature target value. Can be set lower according to the intake air temperature, and energy saving operation with a lower high pressure level can be realized.

The condensing temperature detecting section and the evaporating temperature detecting section used in the first to fourth embodiments employ a saturation temperature conversion method of pressure detection. However, the present invention is not limited to this. Is also good. Embodiments 1 to 4
It is needless to say that the air volume control unit of the above can apply “phase control”, “pulsation control”, “chopper control”, “inverter control”, etc., which are generally used for variable speed control of the motor.

[0054]

As described above, according to the present invention, the condensing temperature detected by the condensing temperature detecting means is substantially equal to the condensing temperature target value which changes according to the evaporating temperature detected by the evaporating temperature detecting means. Since the configuration is such that the air volume of the blower is controlled so as to coincide with each other, it is possible to obtain a refrigerating apparatus capable of ensuring an operation state at an appropriate condensing temperature and an evaporating temperature. Further, in this refrigerating apparatus, since the conventional condensing temperature control method is not used, an adjustment load for each model development can be eliminated. Further, since feedback control of the condensing temperature is used, hunting can be prevented, and the refrigerating capacity can be stabilized. In addition, in a region where the evaporation temperature is low, unstable operation of the refrigeration cycle due to a decrease in the condensation temperature due to an excessive air flow can be suppressed, and an excessive rise in the discharge temperature due to an insufficient air flow can be suppressed. Further, it is possible to prevent an increase in input due to an insufficient air volume in a region where the evaporation temperature is high.

According to the next invention, the suction air temperature is taken into consideration in setting the condensation temperature target value.
The condensing temperature target value can be set low according to the intake air temperature, and an effect is obtained that a refrigeration apparatus capable of realizing energy-saving operation at a lower high-pressure level can be obtained.

According to the next invention, the evaporating temperature estimating means is configured to estimate the evaporating temperature based on the current condensing temperature, the current suction air temperature and the current air volume. This eliminates the need to provide a refrigeration apparatus that can reduce costs.

According to the next invention, since the evaporating temperature estimating means is configured to estimate the evaporating temperature based on the current condensing temperature and the current air volume, it is necessary to provide the evaporating temperature detecting means and the suction air temperature detecting means. Is eliminated, and a refrigeration apparatus that can further reduce the cost can be obtained.
This has the effect.

According to the next invention, since the suction air temperature is taken into consideration in setting the condensation temperature target value, the condensation temperature target value can be set lower in accordance with the suction air temperature. This provides an effect that a refrigeration apparatus capable of realizing an energy-saving operation with reduced energy consumption can be obtained.

According to the next invention, the air volume of the blower is controlled so that the condensing temperature substantially coincides with the condensing temperature target value that changes in accordance with the evaporating temperature. The operation state can be secured. Further, in this air volume control method, since a conventional condensing temperature control method is not used, an adjustment load for each model development can be eliminated. Further, since feedback control of the condensing temperature is used, hunting can be prevented, and the refrigerating capacity can be stabilized. In addition, in a region where the evaporation temperature is low, unstable operation of the refrigeration cycle due to a decrease in the condensation temperature due to an excessive air flow can be suppressed, and an excessive rise in the discharge temperature due to an insufficient air flow can be suppressed. Further, it is possible to prevent an increase in input due to an insufficient air volume in a region where the evaporation temperature is high.

According to the next invention, since the suction air temperature is taken into consideration in setting the condensation temperature target value,
The condensing temperature target value can be set low according to the intake air temperature, and an effect is achieved that an energy-saving operation at a lower high-pressure level can be realized.

According to the next invention, the evaporating temperature is estimated based on the current condensing temperature, the current suction air temperature, and the current air volume. Therefore, there is no need to provide an evaporating temperature detecting means, and the cost is reduced. Can be reduced.

According to the next invention, since the evaporating temperature is estimated based on the current condensing temperature and the current air volume, it is not necessary to provide the evaporating temperature detecting means and the suction air temperature detecting means, and the drastically improved. This has the effect of reducing costs.

According to the next invention, since the suction air temperature is considered in setting the condensing temperature target value, the condensing temperature target value can be set lower in accordance with the suction air temperature, and the higher pressure level can be set. This has the effect of realizing energy-saving operation with reduced power consumption.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a refrigeration apparatus according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a relationship between a condensing temperature and an evaporating temperature in the first embodiment.

FIG. 3 is a flowchart illustrating an air volume control method according to the first embodiment;

FIG. 4 is a diagram illustrating a configuration of a refrigeration apparatus according to a second embodiment of the present invention.

FIG. 5 is a diagram showing a relationship among a condensing temperature, an evaporating temperature, and a suction air temperature in the second embodiment.

FIG. 6 is a flowchart illustrating an air volume control method according to the second embodiment.

FIG. 7 is a diagram showing a configuration of a refrigeration apparatus according to Embodiment 3 of the present invention.

FIG. 8 is a diagram showing a state of estimating an evaporation temperature according to a condensation temperature and a suction air temperature.

FIG. 9 is a flowchart illustrating an air volume control method according to the third embodiment.

FIG. 10 is a diagram showing a configuration of a refrigeration apparatus according to Embodiment 4 of the present invention.

FIG. 11 is a diagram showing a relationship among a condensing temperature, an evaporating temperature, and a suction air temperature in the fourth embodiment.

FIG. 12 is a flowchart illustrating an air volume control method according to the fourth embodiment.

FIG. 13 is a diagram showing a configuration of a conventional refrigeration apparatus.

FIG. 14 is a diagram showing a conventional air volume control method.

FIG. 15 is a diagram showing a conventional air volume control method.

FIG. 16 is a diagram showing a conventional air volume control method.

[Explanation of symbols]

1 compressor, 2 condenser, 3 throttle section, 4 evaporator, 5
Blower, 9 Condensation temperature detector, 10 Evaporation temperature detector, 11, 13, 15 Air volume controller, 12 Condenser suction air temperature detector, 14 Evaporation temperature estimator.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tetsuya Yamashita 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsui Electric Co., Ltd. (72) Inventor Hiroshi Sata 2-3-2 Marunouchi, Chiyoda-ku, Tokyo 3 Rishi Electric Co., Ltd.

Claims (10)

[Claims] 1. A refrigeration system that communicates a compressor, a condenser, a throttle device, and an evaporator with a refrigerant pipe and controls a flow rate of a blower to the condenser by an air-refrigerant heat exchanger. Condensing temperature detecting means for detecting a condensing temperature; evaporating temperature detecting means for detecting an evaporating temperature of the evaporator; and the blower such that the condensing temperature substantially matches a condensing temperature target value that changes according to the evaporating temperature. A refrigeration apparatus comprising: an air volume control unit that adjusts the air volume of the refrigeration system. 2. A refrigeration apparatus which communicates a compressor, a condenser, a throttle device, and an evaporator with a refrigerant pipe and controls a flow rate of a blower to the condenser by an air-refrigerant heat exchanger. Condensation temperature detection means for detecting the condensation temperature; evaporation temperature detection means for detecting the evaporation temperature of the evaporator; suction air temperature detection means for detecting the suction air temperature of the condenser; and the condensation temperature being the evaporation temperature A refrigerating apparatus, comprising: and an air volume control unit that adjusts an air volume of the blower so as to substantially match a condensing temperature target value that changes according to the suction air temperature. 3. A refrigeration apparatus which communicates a compressor, a condenser, a throttle device, and an evaporator with a refrigerant pipe and controls a flow rate of a blower to the condenser by an air-refrigerant heat exchanger. Condensation temperature detection means for detecting the condensation temperature; suction air temperature detection means for detecting the suction air temperature of the condenser; evaporation for estimating the evaporation temperature based on the condensation temperature, the suction air temperature and the current air volume. Temperature estimating means, and air volume control means for adjusting the air volume of the blower so that the condensing temperature substantially matches a condensing temperature target value that changes according to the evaporation temperature and the suction air temperature. Refrigeration equipment. 4. A refrigeration apparatus that communicates a compressor, a condenser, a throttle device, and an evaporator with a refrigerant pipe and controls a flow rate of a blower to the condenser by an air-refrigerant heat exchanger. Condensation temperature detection means for detecting the condensation temperature; suction air temperature detection means for detecting the suction air temperature of the condenser; evaporating temperature for estimating the evaporation temperature based on the condensation temperature, the suction air temperature and the current air volume. A refrigerating apparatus comprising: an estimating unit; and an air volume control unit that adjusts an air volume of the blower so that the condensing temperature substantially matches a condensing temperature target value that changes according to the evaporation temperature. 5. A refrigeration apparatus which communicates a compressor, a condenser, a throttle device, and an evaporator with a refrigerant pipe and controls a flow rate of a blower to the condenser by an air-refrigerant heat exchanger. Condensation temperature detection means for detecting a condensation temperature; suction air temperature detection means for detecting a suction air temperature of the condenser; and a condensing temperature substantially matching a condensation temperature target value that changes according to the suction air temperature. A refrigeration apparatus, further comprising: an air volume control unit configured to adjust an air volume of the blower. 6. A method for controlling the flow rate of a condenser in a refrigeration system in which a compressor, a condenser, a throttle device, and an evaporator are communicated with a refrigerant pipe, wherein a condensation temperature detection step of detecting a condensation temperature of the condenser. An evaporating temperature detecting step of detecting an evaporating temperature of the evaporator; and an air volume controlling step of adjusting an air volume of the blower so that the condensing temperature substantially matches a condensing temperature target value that changes according to the evaporating temperature. The air volume control method characterized by including. 7. A method for controlling a flow rate of a condenser in a refrigerating apparatus in which a compressor, a condenser, a throttle device, and an evaporator are connected by a refrigerant pipe, wherein a condensing temperature detecting step of detecting a condensing temperature of the condenser. An evaporating temperature detecting step of detecting an evaporating temperature of the evaporator; an inlet air temperature detecting step of detecting an inlet air temperature of the condenser; and the condensing temperature changes according to the evaporating temperature and the inlet air temperature. An air volume control step of adjusting an air volume of the blower so as to substantially match a condensing temperature target value. 8. A method for controlling the flow rate of a condenser in a refrigerating apparatus in which a compressor, a condenser, a throttle device, and an evaporator are connected by a refrigerant pipe, wherein a condensing temperature detecting step of detecting a condensing temperature of the condenser. An intake air temperature detecting step of detecting an intake air temperature of the condenser; an evaporating temperature estimating step of estimating an evaporating temperature based on the condensing temperature, the suction air temperature, and a current air volume; and An air volume control step of adjusting an air volume of the blower so as to substantially coincide with an evaporation temperature and a condensing temperature target value that changes according to the suction air temperature. 9. A method for controlling the flow rate of a condenser in a refrigerating apparatus in which a compressor, a condenser, a throttle device, and an evaporator are communicated with a refrigerant pipe, wherein a condensing temperature detecting step of detecting a condensing temperature of the condenser. An evaporating temperature estimating step of estimating an evaporating temperature based on the condensing temperature and a current air volume; and adjusting an air volume of the blower such that the condensing temperature substantially matches a condensing temperature target value that changes according to the evaporating temperature. And an air volume control step. 10. A method for controlling the flow rate of a condenser in a refrigerating apparatus in which a compressor, a condenser, a throttle device, and an evaporator are connected by a refrigerant pipe, wherein a condensing temperature detecting step of detecting a condensing temperature of the condenser. An intake air temperature detecting step of detecting an intake air temperature of the condenser; and an air volume control for adjusting an air volume of the blower such that the condensed temperature substantially matches a condensed temperature target value that changes according to the intake air temperature. A method for controlling air flow, comprising: