JPS62119381A - Refrigerator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (a) Industrial Application Field The present invention relates to refrigeration equipment used in super showcases, refrigerators, thermostats, etc., and requires high precision in %K and internal temperature control. The present invention relates to a refrigeration system.

(B) Conventional technology Conventionally, this type of refrigeration system is described in Japanese Utility Model Publication No. 58-48987, etc., and as shown in FIG. 14 and a fan motor 15 for cooling the evaporator.

Then, by detecting the gas temperature on the exit side of the evaporator 14 with the temperature sensing cylinder 16 provided on the exit side of the evaporator 14,
While adjusting the throttle amount of the expansion valve 13, the temperature of the evaporator 14 is controlled by ventilating the evaporator 14 by the fan motor 15VC, so that the internal temperature of the refrigerator remains constant.

(c) Problems to be solved by the invention However, according to the above configuration, the temperature control inside the refrigerator is
Since this is an indirect control in which the temperature of the evaporator 14 is adjusted after detecting the gas temperature using the thermosensor cylinder 16 and changing the throttle valve of the expansion valve 13, it is not affected by changes in the pressure or temperature of the refrigerant in the refrigeration cycle. However, when the air temperature inside the refrigerator changes, first the temperature of the fins of the evaporator 14 changes, then the temperature of the temperature sensing cylinder 16 of the expansion valve 13 changes, and then The response is slow, such as when the expansion valve 13 is activated, making it difficult to control the temperature within the refrigerator within a range of, for example, ±0.5 to 1° C. with high accuracy from the set temperature.

The present invention was made in view of the above, and aims to speed up the response of the refrigeration system to temperature changes inside the refrigerator and to control the temperature inside the refrigerator with high precision and less fluctuation. Means for Solving the Problems The present invention provides a refrigeration system equipped with a compressor, a condenser, a pressure reducing device, an evaporator, and a fan motor for cooling the evaporator. A temperature sensor is provided near the stored items, and an α valve is provided on the outlet side of the evaporator in the refrigerant circuit, and the rotation speed of the fan motor and the opening degree of the valve are controlled based on the signal from the temperature sensor. This is what I did.

(e) Function The refrigeration system of the present invention has the above-described configuration, and the temperature sensor directly detects the change in the air temperature in the refrigerator, and the 7-amp motor is activated according to the difference between the detected temperature and a preset temperature. It is possible to control the rotation speed and the opening degree of the motorized valve b-, which speeds up the response of the evaporator temperature control to changes in the air temperature inside the refrigerator, making it possible to control the temperature inside the refrigerator with high accuracy and less fluctuation. This is what I did.

(f) Example Embodiments of the present invention will be described below based on the drawings. .

Reference numeral 1 denotes a device motor that is composed of a compressor 2, a condenser 3, a temperature-type expansion valve 5 having a temperature-sensitive tube 4, and an evaporator 6.

8 is an electric valve provided on the outlet side of the evaporator 6. 9 is a temperature sensor that detects the temperature of the air suction part of the evaporator 6. Reference numeral 10 denotes a control device that controls the rotation speed of the fan motor γ and the degree of throttling of the electric valve 8 based on the signal from the temperature sensor 9. The target hole temperature is input in advance to this control device as a set temperature, and the temperature IW detected by the temperature sensor 9 is compared with the set temperature, and a signal of a magnitude corresponding to this temperature difference is sent to the fan. It is output to the motor 7 and electric valve 8. When the temperature detected by the temperature sensor 9 is higher than the set temperature, the control device 10 sends a signal corresponding to the difference to the fan motor 7 and the electric valve 8,
While increasing the rotation speed of the fan motor 7, the opening degree of the electric valve 8 is controlled to be large, and if the detected temperature is lower than the set temperature, a signal corresponding to the difference is sent to the fan motor 7. The motor-driven valve 8 is sent to the motor-driven valve 8, and the rotational speed of the fan motor r is lowered, while the opening degree of the motor-driven valve 8 is controlled to be small.

In the refrigeration system configured in this way, the temperature sensor 9 is installed in the air suction part of the evaporator 6, which is easily affected by temperature changes inside the refrigerator, and the fan motor 7 and electric valve 8 are The rotation speed or the opening degree of the evaporator 6 is controlled by a value corresponding to the difference between the temperature detected by the temperature sensor 9 and the set temperature, and the evaporator 6 is controlled by the fan motor 7 and the electric valve 8. Since the flow rate of air passing through and the flow rate of refrigerant gas, that is, the amount of heating, are controlled,
The operation from the change in the internal temperature b'' to the end of the evaporator 6 capacity control becomes faster, and the cooling capacity of the evaporator 6 can be adjusted according to the fluctuations in the internal load. It is possible to accurately bring the internal temperature close to the set temperature.

(G) Effects of the Invention As described above, the present invention provides a refrigeration system equipped with a compressor, a condenser, a pressure reducing device, an evaporator, and a fan motor for cooling the evaporator. A temperature sensor was installed near the stored items in the refrigerator, and an electric valve was installed on the outlet side of the evaporator in the refrigerant circuit, and the rotation speed of the fan motor and the opening degree of the electric valve were controlled based on the signal from the temperature sensor. Therefore, the temperature sensor directly detects changes in the air temperature inside the refrigerator, and the fan motor operates according to the difference between the detected temperature and the preset temperature.
It is possible to control the rotation speed and the opening degree of the electric valve overnight, and the response of the evaporator temperature control to changes in the air temperature inside the refrigerator is accelerated, allowing the temperature inside the refrigerator to be set with high precision with little fluctuation. can be kept.

[Brief explanation of drawings]

FIG. 1 is a refrigerant circuit diagram of a refrigeration system showing an embodiment of the present invention;
FIG. 2 is a refrigerant circuit diagram of a conventional refrigeration system [d]. 1... Refrigeration unit, 2... Compressor, 3... Condenser, 5... Expansion valve, 6... Evaporator, 7...
-Fan motor, 8...Electric valve, 9...Temperature sensor, 1o...Control device. Applicant: SANYO Electric Co., Ltd. (1st culprit) Patent attorney: Shizuo Sano Figure 1 Figure 2

Claims (1)

[Claims] (1) In a refrigeration system equipped with a compressor, a condenser, a pressure reducing device, an evaporator, and a fan motor for cooling the evaporator, a temperature sensor is installed at the air intake part of the evaporator or near the stored items in the refrigerator. A refrigeration system characterized in that a motor-operated valve is provided on the outlet side of the evaporator in the refrigerant circuit, and the rotation speed of the fan motor and the opening degree of the motor-operated valve are controlled based on the signal from the temperature sensor.