JP2003329351A - Operation system for inverter refrigerator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an operation system for an inverter refrigerator which efficiently rapidly cooles the inside of a showcase chamber by setting a proper target low pressure. <P>SOLUTION: This operation system for the inverter refrigerating machine 2 has a controller 4 changing output of the refrigerating machine 2. The operation system has a rapid cooling mode switch 36 executing correction calculation subtracting a target low pressure value of a present operation mode to the controller 4 to set new target low pressure. Thereby, the inside of the showcase chamber is rapidly cooled in a short time of period by the rapid cooling mode switch 36, and the inside of the showcase chamber is made to be in a suitable temperature in a short time of period in commodity delivery or the like. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inverter refrigerator operating system for keeping a showcase installed in a store such as a supermarket cold.

[0002]

2. Description of the Related Art Heretofore, as an operating system for an inverter refrigerator of this type, the applicant has filed Japanese Patent Application 2001-320590.
The operation system related to the issue was proposed.

This operating system calculates the enthalpy in the store on the basis of detection signals from a temperature sensor for detecting the temperature in the store and a humidity sensor for detecting the humidity in the store, and then an inverter appropriately corresponding to the enthalpy and the set temperature in the store. The target low pressure of the refrigerator is set, and then the normal mode operation in which the rotation speed of the compressor is changed based on the deviation between the target low pressure and the actual low pressure, and the pull-down performance is confirmed during the trial run. In order to cool the inside of the case, a fixed mode operation in which a predetermined target low pressure for fixing the output of the inverter refrigerator is manually input, and a target low pressure corresponding to the season is currently set to the control means. It is possible to perform the seasonal mode operation in which the calendar information is input and the target low pressure corresponding to the input current calendar information is set.

[0004]

However, in the normal mode operation in the above-described conventional inverter refrigerator operating system, the showcase is rapidly cooled when the temperature of the inside of the showcase is increased by delivering the product. I couldn't. In addition, when confirming the pull-down performance during test operation, in fixed mode or seasonal mode operation, it is necessary to have specialized knowledge to set the target low pressure manually, or when the season changes, an appropriate target low pressure corresponding to the season is required. The pressure could not be set. For this reason, there is a risk of wasting power.

The present invention has been made in view of the above circumstances, and an object of the present invention is to set an appropriate target low pressure to rapidly cool the inside of a showcase appropriately. It is to provide a machine operating system.

[0006]

To achieve the above object, the invention of claim 1 sets a target low pressure based on a showcase, an inverter refrigerator for cooling the showcase, and an operation mode. An inverter refrigerating machine operating system comprising: a control means for varying the output of the inverter refrigerating machine; and a structure having a quenching mode input means for setting the control means to reduce a target low-pressure pressure in an operation mode by a predetermined pressure. Has become.

According to the first aspect of the present invention, an appropriate target low pressure is automatically set when rapidly cooling the interior of the showcase.

According to a second aspect of the present invention, in the operating system for the inverter refrigerator according to the first aspect, the control means is
The structure is such that the rapid cooling mode is returned to the operation mode based on at least one of the elapsed time of the rapid cooling mode and the temperature inside the showcase.

According to the invention of claim 2, in addition to the operation of claim 1, it is possible to automatically return to the original operation mode when the quenching mode operation becomes unnecessary.

According to a third aspect of the present invention, in the inverter refrigerator operating system according to the second aspect, the quenching mode input means has a structure in which the return condition can be arbitrarily set.

According to the invention of claim 3, in addition to the effect of claim 2, the condition for returning from the quenching mode operation to the original operation mode is set to the goods in the showcase and the environment around the installed showcase. It can be set as appropriate.

[0012]

1 to 3 show a position embodiment of an operating system of an inverter refrigerator according to the present invention. FIG. 1 is a refrigerant pipe diagram between a showcase in a store and an inverter refrigerator, FIG. 2 is a block diagram showing a drive circuit of the operating system of the inverter refrigerator, and FIG. 3 is a flowchart of the target low pressure control.

First, the refrigerant piping system between the showcase in the store and the inverter refrigerator, which constitutes the operating system of the inverter refrigerator, will be described with reference to FIG. Many showcases 1 are arranged in the store, and these showcases 1
An evaporator 11 for cooling the inside of the refrigerator is installed therein. Also,
These evaporators 11 have an expansion valve 12 and a solenoid valve 13
Are connected in parallel to the condenser 21 and the compressor 22 of the inverter refrigerator 2 via. Here, each solenoid valve 13 regulates the refrigerant flow to each evaporator 11, and opens when the internal cooling is performed, while it closes when the internal cooling is unnecessary to regulate the refrigerant inflow.

The showcase 1 is arranged in a store, and the enthalpy is greatly affected by the temperature and humidity inside the store. Therefore, in the normal mode of the operating system of the inverter refrigerator 2 according to the present embodiment, the relationship between the store temperature and the store humidity controlled by the store air conditioner (not shown) in the store where the showcase 1 is arranged, and the store enthalpy. , And the relationship between the enthalpy in the store and the suction pressure of the compressor showcase,
The optimum rotation speed of the compressor 22 corresponding to the change of the suction pressure can be automatically obtained.

Further, the operating system of the inverter refrigerator 2 according to the present embodiment has a fixed mode in which the target low pressure is fixed by manual input as an operation mode for pull-down operation performed at the time of test operation of the showcase 1 or the like. , A seasonal mode in which a plurality of types of target low pressures are set on the basis of the in-store enthalpy corresponding to the season and the target low pressures are selected according to the calendar.

In addition to the normal mode, the fixed mode, and the seasonal mode, the rapid cooling mode is an operation mode for optimally performing the pull-down operation during the trial operation when the temperature inside the showcase 1 is increased by delivering a product. have.

The operation system of the inverter refrigerator 2 according to the present embodiment is configured with the drive circuit shown in FIG. 2 so that the normal operation mode, the fixed mode, the seasonal mode and the quenching mode can be set arbitrarily.

That is, the in-store temperature sensor 31 for detecting the temperature inside the store 3 (outside the showcase 1) and the in-store humidity sensor 32 for detecting the in-store humidity (outside the showcase 1).
Has been installed.

The control device 4 has an in-store enthalpy calculating section 41 for calculating the in-store enthalpy from the detected temperature and detected humidity of each sensor 31, 32. The in-store enthalpy calculation unit 41 is configured to calculate the enthalpy from the normal mode switch 33 in response to a driving signal.

The in-store enthalpy calculated by the in-store enthalpy calculation unit 41 is input to the target low pressure setting calculation unit 42. The target low pressure setting calculation unit 42 is configured to set an optimum target low pressure corresponding to the in-store enthalpy. Further, the target low pressure setting calculation unit 42 is input with each mode signal from the fixed mode switch 34, the seasonal mode switch 35, and the rapid cooling mode switch 36. As the mode signal of the fixed mode switch 34, the manually input low pressure pressure value is directly input, and the input low pressure value is directly set as the target low pressure value. The input pressure value is, for example, 0.01 to 0.
A predetermined low pressure is set in the range of 49 MPa. Also,
A command signal for performing the seasonal mode operation is output from the seasonal mode switch 35, and the target low pressure stored in the target low pressure setting calculation unit 42 is determined. For example,
If the current month is in the summer (June to August), the enthalpy in the store is set to 14 kcal / kg, and in the winter (December to February), the enthalpy in the store is set to 10 kcal / kg, and the interim period 12kca when it was (March-May, September-November)
It is designed to be set to l / kg.

A command signal is output from the quenching mode switch 36 to carry out the quenching mode operation, and 0.02 to 0.1 MPa is applied to the target low pressure value calculated according to the operation mode at that time. A correction calculation for subtraction is performed, and the rapid cooling mode operation is performed with the new target low pressure value.
Then, the termination condition of the quenching mode operation is set in advance such that a predetermined time has elapsed or the target temperature is reached, and when the termination condition is satisfied, the quenching mode operation is terminated and the operation mode before the quenching mode operation is restored. It is supposed to do.

In this embodiment, the target low pressure setting section 42 has an inside temperature setting section 43 for inputting the set temperature of the showcase 1, and the inside temperature setting section 43 inputs the set temperature. However, when the set temperatures of the showcases 1 are the same, the target low-pressure pressure value corresponding thereto may be stored in advance, and the inside temperature setting unit 43 is not necessary.

The target low pressure calculated or set by the target low pressure setting unit 42 is input to the rotation speed command calculation unit 25 of the inverter refrigerator 2. This rotation speed command calculator 25
The actual low pressure of the compressor 22 detected by the low pressure sensor 23 is input to the, and the rotation speed of the compressor 22 is calculated based on the deviation between the actual low pressure and the target low pressure.

The rotation speed signal of the rotation speed command calculation unit 25 is output to the compressor 22 through the inverter 24. Then, the low-pressure pressure of the compressor 22 is fed back to the rotation speed command calculation unit 25 detected by the low-pressure pressure sensor 23, and is gradually converged so as to approach the target low-pressure pressure, and the optimum rotation speed is obtained.

As described above, the compressor 22 is controlled by the in-store enthalpy calculating section 41, the target low pressure setting section 42, the inside temperature setting section 43 of the control device 4, and the rotation speed command calculating section 25 of the inverter refrigerator 2. A control means for controlling the number of rotations of is constructed.

The feedback control such as the rotation speed command calculation unit 25 → the inverter 24 → the compressor 22 → the low pressure sensor 23 → the rotation speed command calculation unit 25 is a well-known technique which is usually performed in the operation system of the inverter refrigerator 2. .

The control of this embodiment based on the above configuration will be described with reference to the flowchart of FIG. That is, the control device 4 determines which mode signal is input from the normal mode switch 33, the fixed mode switch 34, or the seasonal mode switch 35 (step S1).
~ Step S3). When the signal in the normal mode is input, the average value of humidity and temperature in the store is calculated (step S4), and the enthalpy in the store is calculated (step S).
5). As described above, in the normal mode, the rotation speed of the compressor 22 can be controlled based on the in-store enthalpy corresponding to the in-store temperature and humidity to save energy (step S6).

On the other hand, when the showcase 1 is installed in the store 3, pulldown operation is performed to check the pulldown performance, but there are cases where it is desired to manually set the low pressure value based on the experience of the tester. (Step S
2). In such a case, the target low pressure value is manually input by the fixed mode switch 34. As a result, the low pressure value input by the fixed mode switch 34 is set as the target low pressure value of the compressor 22 (steps S7, S8). Similarly, during pull-down operation, the in-store enthalpy may be greatly affected by the season (step S3). To deal with this, the seasonal mode switch 35 is turned on. As a result, a command signal is output to perform the seasonal mode operation, and the current month is summer (June to August), winter (December to February), and interim period (March to May, September to November). ) Enthalpy is 14kcal / kg, 10kcal / kg, 12kc
set to al / kg (steps S9 to S1)
3). A predetermined correction calculation is performed based on the in-store enthalpy set in this way, and the target low pressure of the compressor 22 according to the season is calculated (step S14).

When the goods are delivered during the above normal mode operation, or during the operation in either the fixed mode or the seasonal mode, when the optimum target low pressure is not set and the pull-down operation is not executed well, It is necessary to cool the inside of the showcase 1 in a short time. At this time, the rapid cooling mode switch 36 is turned on to execute the rapid cooling mode operation described below. That is, when the rapid cooling mode switch 36 is turned on (step S15), a command signal is output to perform the rapid cooling mode operation, and the target low pressure pressure value of the compressor 22 before the rapid cooling mode switch 36 is turned on is corrected. A predetermined correction calculation for quenching that reduces the value is performed, and the target low-pressure pressure value of the compressor 22 is calculated (step S16). This correction calculation varies depending on the mode before the quenching mode operation is executed, and is 0.02 to 0.
1 MPa is subtracted from the target low pressure value. After that, for example, when the termination condition of the rapid cooling mode is set to be when the temperature in the refrigerator reaches 3 ° C., the quenching mode operation is terminated when the temperature in the refrigerator in the showcase 1 reaches 3 ° C. , Return to the operation mode before the quenching mode operation is executed.

As described above, according to the operation system of the inverter refrigerator 2 according to the present embodiment, the inside of the showcase 1 can be rapidly moved in any operation mode of the normal mode operation, the fixed mode operation and the seasonal mode operation. When it becomes necessary to cool, the interior of the showcase 1 is cooled in a short time by the rapid cooling mode operation, and when the rapid cooling is completed, the rapid cooling mode operation is stopped to return to the original operation mode, The temperature inside the showcase 1 can be maintained at an appropriate temperature.

Further, as shown in FIG. 4, the operating condition (a) of the showcase 1 during operation and the respective setting conditions (b) such as the end condition of the quenching mode operation are displayed on the screen, and the screen is viewed. However, it is also possible to easily perform the setting operation. For example, if the quenching mode operation time or the internal temperature is 3
It is preferable to set the target temperature inside the refrigerator such that when the temperature reaches 0 ° C., the trouble of monitoring the temperature inside the showcase 1 is eliminated and the convenience of temperature management is improved. In the present embodiment, the one in which the quenching mode operation is terminated when the target temperature is reached is shown, but a timer (not shown) is provided to measure the elapsed time, and the quenching mode termination condition is set to 30 minutes. The termination condition may be set based on the elapsed time.

In the above embodiment, the operating system of the inverter refrigerator 2 having the normal mode, the fixed mode, the seasonal mode and the quenching mode has been described. However, the inverter refrigerator 2 having the normal mode and the quenching mode operation has been described.
Or the operating system of the inverter refrigerator 2 having the normal mode operation, the seasonal mode operation, and the rapid cooling mode operation.

[0033]

As described in detail above, according to the invention of claim 1, the rapid cooling mode input means automatically calculates an appropriate target low pressure value to cool the inside of the showcase in a short time. As a result, the showcase can be cooled optimally.

According to the second aspect of the present invention, after the inside of the showcase is sufficiently cooled by the rapid cooling mode operation, the original operating mode is automatically restored, so that the showcase is optimally cooled and the power consumption is reduced. It is possible to prevent waste of money.

According to the third aspect of the present invention, since the condition for ending the quenching mode and returning to the original operation mode can be set arbitrarily, the target temperature or the operation time can be changed in accordance with the state of the showcase to optimize the operation. Thus, the rapid cooling mode operation can be executed, and the interior of the showcase can be optimally cooled by further reducing the waste of electric power.

[Brief description of drawings]

[Figure 1] Refrigerant pipeline diagram between the showcase and the inverter refrigerator in the store

FIG. 2 is a block diagram showing a drive circuit of an operating system of an inverter refrigerator.

FIG. 3 is a flowchart showing target low pressure control of an inverter refrigerator.

FIG. 4 is a diagram showing a specific example of a screen display for setting an inverter refrigerator.

[Explanation of symbols]

1 ... Showcase, 2 ... Inverter refrigerator, 4 ... Control device, 22 ... Compressor, 23 ... Low pressure sensor, 25 ... Rotation speed command calculator, 31 ... Store temperature sensor, 32 ... Store humidity sensor, 33 ... Normal Mode switch, 34 ... Fixed mode switch, 35 ... Seasonal mode switch, 36 ... Quenching mode switch, 41 ... In-store enthalpy calculation unit, 42 ... Target low pressure setting calculation unit, 43 ... In-compartment temperature setting unit.

Claims (3)

[Claims] 1. An operation of an inverter refrigerator comprising a showcase, an inverter refrigerator for cooling the showcase, and a control means for setting a target low-pressure pressure based on an operation mode and varying an output of the inverter refrigerator. In the system, there is provided a quenching mode input means for setting the target low pressure in the operation mode to a predetermined pressure with respect to the control means, and an operating system for an inverter refrigerator. 2. The inverter refrigerator according to claim 1, wherein the control means returns from the rapid cooling mode to the operation mode based on at least one of the elapsed time of the rapid cooling mode and the temperature inside the showcase. Driving system. 3. The operating system for an inverter refrigerator according to claim 2, wherein the rapid cooling mode input means can set the return condition arbitrarily.