JP4766681B2 - Refrigerated showcase - Google Patents

Description

The present invention relates to operation control of a compressor in a refrigerated showcase.

Refrigerated showcases installed in stores such as supermarkets are equipped with refrigeration equipment such as compressors and coolers as is well known, and the cold air cooled by this refrigeration equipment is blown out into the showcase cabinet and displayed in the cabinet. The product is cooled, but the operation is controlled by a showcase controller attached to the showcase.

The internal temperature is controlled so that the internal temperature can be maintained at the target temperature set by the showcase controller. To that end, the compressor is controlled on and off.

By the way, with regard to the on / off control of the compressor, if the compressor is once stopped and then immediately restarted, a refrigerant pressure imbalance occurs, and an excessive starting torque is required. If the compressor is restarted in this state, an excessive force is applied to the drive system, causing deformation, or the overcurrent protection device connected to the compressor is activated by overcurrent. Operation of the compressor may cause damage.

In order to avoid such a situation, conventionally, after the compressor has been temporarily stopped, a protection function is provided so that the time normally takes about 3 minutes to restart after the refrigerant pressure reaches an equilibrium state. (For example, refer to Patent Document 1).
JP-A-4-106384

When manufacturing a frozen and refrigerated showcase at the factory and inspecting it at the manufacturing stage before shipment, or when checking the initial operation at the loading stage when bringing it into the store and installing it, turn on the power at every inspection. The compressor is started from a stopped state, but when the power is turned on to the case body, it is shown whether it is starting from a refrigerant pressure imbalance or from a state where the refrigerant pressure is already in equilibrium. It cannot be judged by the case controller.

As a result, it is necessary to wait for 3 minutes, for example, until the protection device is activated and stopped after every successive inspections, for example, even though the refrigerant pressure is balanced at the initial stage. , Waste time on inspection. In addition, when an inexperienced person inspects, if it is stopped for 3 minutes, it may be mistaken for a failure.

In addition, in the case of a momentary power stop where the energization stops momentarily for a very short time (for example, 1 to 2 seconds), the system is restarted immediately after the stop, resulting in inconvenience such as an excessive force applied to the drive system. .

When starting up the compressor in this way, it takes a certain amount of time to start up even if the pressure of the compressor is balanced, and the protection function operates like a momentary power failure. Even if it is necessary to do so, it may restart.

The object of the present invention is to eliminate the inconvenience of the conventional example, and if there is no inconvenience even if it is started immediately from a stopped state at the showcase manufacturing stage or storefront installation installation stage, etc., confirm the operation of the compressor by starting immediately. In a short time, the work efficiency can be improved. An object of the present invention is to provide a freezing and refrigeration showcase capable of preventing the start-up failure at equilibrium and protecting the compressor.

The present invention achieves the above-mentioned object, and the invention according to claim 1 is provided with a refrigeration apparatus such as a compressor and a cooler, and connected with a showcase controller for controlling the operation of the refrigerated showcase. the in refrigerated showcase and protection to the compressor to connect the protector compressor is immediately restarted after stopping device stops driving of the operating compressors, the compression of the first time after the refrigerated showcase production The starting number of times since the start of the machine is stored in advance in the showcase controller, and the set number of times is transferred to the immediate operation without stopping after restarting the compressor. To do.

As described above, the freezing and refrigeration showcase of the present invention stores the number of start-ups after the initial start-up of the compressor in the controller for showcase in advance, and the set number of times is set in the compressor. After starting up, the system shifts to immediate operation without stopping, so if there is no inconvenience even if it is started immediately at the time of inspection at the showcase manufacturing stage or in-store installation stage, the predetermined number of inspections will be performed by the compressor. The system can be started immediately after the power is turned on from the stopped state, and it is not necessary to wait for the required time until the start, and the operation of the compressor can be confirmed in a short time, thereby improving the work efficiency.

In addition, when a standby time is required before restarting, such as a momentary power failure that occurs during operation, the protection function operates reliably to prevent startup failure due to refrigerant pressure imbalance and protect the compressor. Can be achieved.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a flowchart of the operation showing the first embodiment of the refrigerated showcase of the present invention. The operation of the refrigerated showcase is controlled by turning on and off the compressor by the controller for the refrigerated showcase and setting the internal temperature. The target temperature is maintained.

FIG. 1 (a) is a flowchart of the temperature control. During the cooling operation, the compressor is turned on (Step 1) to supply cold air into the warehouse and to cope with the types of products stored in the warehouse. And the target temperature is set in advance.

When the internal temperature becomes lower than the target temperature by this cooling operation (step 2), the compressor is turned off (step 3). As a result, if the inside temperature rises to the target temperature + differential (step 4), the compressor is turned on again to cool the inside. This operation is repeated to keep the interior at a predetermined target temperature.

By the way, as described above, if the compressor is stopped once and then immediately started, excessive starting torque is required due to refrigerant pressure imbalance, and if the compressor is restarted in this state, An excessive force is applied to cause deformation, or an overcurrent current protection device is activated to stop the compressor.

However, the refrigerant pressure is balanced after the power is turned on during several inspections during installation at the showcase manufacturing stage or in the store delivery stage, so the compressor is started immediately after the power is turned on from a stopped state. However, no inconvenience arises.

Therefore, in the present invention, as a first embodiment of the control method for immediately starting the compressor after the power is turned on, the showcase controller sets the number n of times of startup since the power is turned on at the initial stage of operation to the showcase controller. Store in advance. This number n is, for example, about 3 to several times.

When the compressor is turned on from the stopped state at the time of factory shipment or inspection at the time of store installation (step 5) and then started immediately thereafter, the number of activations is within the set number n and is 0. If not (step 6), the compressor is immediately activated to start operation (step 7).

After that, if the driving time of the compressor for inspection elapses for a required time, for example, 30 seconds (step 8), the number of times the compressor is driven is counted once and 1 is subtracted from the set n times (step 9). ).

Here, the driving time necessary for counting the number of times of driving is set to 30 seconds, for example, when on / off is instantaneously performed during inspection, and the compressor operating time does not reach the fixed time of 30 seconds This is to avoid counting this as one time for subtraction.

After that, if the drive of the compressor continues and 30 minutes have passed after startup, or if the compressor has been stopped by the temperature control in the warehouse, or if it shifts to the defrosting operation (step 10), in this state If the compressor stops, it is determined that the compressor cannot be started immediately, and n is set to 0 (step 11).

Therefore, if the compressor stops in this state, it is set to 0 n times (step 6), so that the protection device of the compressor functions and after the stop, the protection time elapses until the refrigerant pressure is balanced. Then, the compressor is started (step 12).

On the other hand, from the stage of (Step 9), at the time of inspection, the compressor is stopped without passing 30 minutes after starting, and the power supply is shut off without stopping for temperature control or defrosting.

Therefore, the power is turned on again in a state where the number of times of driving is subtracted once and n = n−1 (steps 5 and 6). As a result, the power is turned on immediately after the compressor is stopped (step 7).

The compressor is started immediately after the power is turned on for the number of times set in the showcase controller in this way, and when the number reaches zero (step 6), the compressor startup by inspection is completed. Therefore, after the compressor is stopped, a predetermined protection time elapses before starting.

The second embodiment shown in FIG. 2 is a case where the refrigerant pressure of the compressor is in an equilibrium state after the power is turned on in the first embodiment, and there is no problem even if the compressor is immediately started after the stop.

A method for controlling the inside of the refrigerator to be kept at a predetermined target temperature is the same as in the first embodiment. In the second embodiment, when the power is turned on after the compressor is stopped (step 13), if the inside temperature measured at this time is higher than the target temperature + differential temperature (step 14), the compressor is sufficient. Since it has been stopped for a long time, it is determined that the internal temperature has risen, and it is safe to start the compressor, and the compressor is immediately started (step 15).

On the other hand, if the internal temperature is lower than the target temperature + differential temperature in the stage of (Step 14), the internal temperature is still low, which means that the compressor is stopped for a sufficient time like a momentary power failure. However, it is determined that the refrigerant pressure is unbalanced, and the compressor is started after a lapse of the protection time for starting the compressor (step 16).

FIG. 3 shows the third embodiment. In the second embodiment, the internal temperature is measured and the immediate start of the compressor is determined based on the internal temperature value. In the third embodiment, the power supply is turned on. (Step 17) The temperature of the cooler is measured, and the immediate start-up of the compressor is determined based on the value of the cooler temperature (Step 18).

The sensor for measuring the temperature of the cooler uses a sensor for detecting the defrost attached to the cooler. If the cooler temperature is higher than the target temperature + differential temperature (step 18), when the power is turned on, The compressor has already been stopped for a sufficient period of time while the defrosting operation has already proceeded sufficiently, and it is determined that the refrigerant pressure is already in an equilibrium state, and the compressor is immediately started to start the operation (step) 19).

On the other hand, if the cooler temperature is lower than the target temperature + differential temperature in the stage of (Step 18), the fact that the cooler temperature is still low means that the compressor is stopped for a sufficient time like a momentary power failure. However, it is determined that the refrigerant pressure is unbalanced, and the compressor is started after waiting for the compressor start protection time to elapse (step 16).

Since the third embodiment directly measures the temperature of the cooler compared to the second embodiment in which the internal temperature is a criterion for immediately starting the compressor, severe data close to the refrigerant state of the compressor is obtained. can get.

FIG. 4 shows a fourth embodiment. After turning on the power (step 21), the blower fan in the cabinet is turned on for, for example, 10 seconds (step 22), and then the temperature inside the cabinet is measured before the blower fan is turned on. Compared with the internal temperature, it is determined whether the temperature has risen by a predetermined value or more, for example, 5 ° C. or more (step 23).

Turning on the blower fan in the cabinet means stirring the air in the cabinet. As a result, the temperature inside the cabinet has risen by 5 ° C or more. It is determined that warm outside air has been taken in by the blower fan turning to the state where it is.

On the other hand, the fact that the internal temperature does not rise above a predetermined value, for example, 5 ° C. means that the internal temperature has already risen to a temperature close to room temperature even if the blower fan rotates and the indoor air is taken in, If it is larger than that, the inside temperature will not rise.

And, as described above, the internal temperature is already close to room temperature and has not risen above the predetermined value, the compressor has already stopped for a sufficient time, and the refrigerant pressure is It is determined that the vehicle is already in an equilibrium state, and the compressor is immediately activated to start operation (step 24).

On the other hand, when the internal temperature rises by 5 ° C. or more, it is determined that the compressor has not stopped for a sufficient time as in the case of momentary power interruption and the refrigerant pressure is in an unbalanced state (step 23). The compressor is started after waiting for the machine start protection time to elapse (step 25).

It is a flowchart of the operation | movement which shows 1st Embodiment of the freezer / refrigeration showcase of this invention. It is a flowchart of the operation | movement which shows 2nd Embodiment of the freezer refrigerator showcase of this invention. It is a flowchart of the operation | movement which shows 3rd Embodiment of the freezer / refrigeration showcase of this invention. It is a flowchart of the operation | movement which shows 4th Embodiment of the starting control method of the freezer refrigerator showcase of this invention.

Claims (3)

Refrigeration equipment such as a compressor and cooler is installed, a showcase controller is connected to control the operation of the refrigerated showcase, a protection device is connected to the compressor, and the compressor is restarted immediately after it stops. Then, in the freezer / refrigerated showcase in which the protection device is activated to stop driving the compressor, the start-up controller after the first start of the compressor after the manufacture of the freezer / refrigerated showcase is stored in the controller for showcase in advance. The refrigerated refrigeration showcase is characterized in that after the compressor is restarted for a predetermined number of times, the operation is immediately stopped without stopping. 2. The refrigerated showcase according to claim 1, wherein when the operation time after the restart of the compressor is a short time within a predetermined time, the number of times of activation is not counted as a preset number of times of activation. After manufacturing the refrigerator / freezer showcase, after the compressor is normally operated for a certain period of time, if the power is turned on again after that, the compressor is restarted after the time necessary for refrigerant pressure balance has elapsed. The frozen and refrigerated showcase according to claim 1.

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