JPH03230076A - Cold accumulation type refrigeigerator - Google Patents

Abstract

PURPOSE:To make it unnecessary to reset the output time of a timer according to a season, to continuously perform cooling operation until a cooling agent id frozen and to shorten the time till the freezing of the cooling agent by performing the cooling and keeping cold in a refrigerator using the sensible heat and latent heat of solidification or melting of the cooling agent. CONSTITUTION:A cooling tank 39 is formed by sealing a cooling agent 40 whose freezing temp. is in the vicinity of the temp. in a refrigerator in a bag body mede of a synthetic resin and four cooling tanks 39 are arranged to four surfaces of the side walls of an inner box 33 to secure heat exchange quantity and the evaporation heat from an evaporator 42 is accumulated at the time of the operation of an electromotive compressor 38 and the evaporation heat accumulated in the cooling agent 40 is discharged at the stop time of the electromotive compresser for controlling the temp. in the refrigerator connected to the electromotive compressor 38 in series detects the temp. of the cooling agent 40. When the cooling agent 40 is frozen, the driving of the electromotive compressor 38 is continued only for an arbitrary time from the first OFF time of the thermoswitch 51. A keep relay 45 operates an a-contact 50 until the a-contact of a timer 44 is turned ON from the point of time when the b-contact 48 of relay 46 is turned ON. The timer 44 operates an a-contact 49 after an arbitrary time from the point of time when the b-contact 47 of the relay 46 is turned ON.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a regenerator refrigerator that is used to keep products that require refrigeration, such as fresh foods and medicines, cold and loaded onto a truck or the like for small-lot deliveries.

As shown in Japanese Patent Application Laid-open No. 62-210369, a conventional cold storage type refrigerator freezes a cold storage agent using an electric compressor installed integrally with the refrigerator, and uses the latent heat of melting of the cold storage agent to keep products cold. It is known that this refrigerator can be loaded onto a truck or the like and used for small-lot deliveries.

An example of the conventional regenerator refrigerator mentioned above will be described below with reference to the drawings.

In Fig. 4, reference numeral 1 denotes a refrigerator for transportation called a cold roll box, which is composed of an insulating box 2 forming the main body and a pair of front and rear four casters 3.4 installed at the bottom of the main body. ing. The insulation box 2 includes both an inner and outer box 5.6 made of metal plates such as stainless copper plates, a foam insulation material 7 filled between the two boxes, and a pair of upper and lower hinges provided at the front opening for storing and taking out products. The heat insulating door 10 is rotatably supported by the heat insulating door 10.

The inner box 5 is formed by a pipe-on-sheet method and doubles as a cooler, and a meandering cooling pipe 11 is arranged on the outer surface of each of the back, right, and left walls, that is, the surface of the foam insulation material 7. The inner box 5 is cooled by the evaporation action of the reduced pressure liquid refrigerant passing through this cooling pipe, and the air inside the refrigerator 12 is cooled by radiant heat from the inner box, causing natural convection. . Reference numeral 13 denotes a large number of cylindrical cold storage agents placed in the upper part of the refrigerator interior 12, and this cold storage agent consists of a press-deformable plastic bag and a gel agent such as potassium chloride filled in the bag. . Reference numeral 17 denotes a machine room formed below the heat insulating box 2, in which a refrigerant compressor 18, a condenser 19, and a blower fan 20 constitute a refrigeration cycle together with the cooling pipe 11.
Storage is arranged.

FIG. 5 shows the operating circuit, and 25 is a timer device, which includes a timer motor 26, an internal temperature regulator 21, and an electromagnetic contactor 22.
It consists of a B contact 27 inserted into a series circuit, an A contact 28 connected in parallel to the internal temperature regulator 21, and a contact piece 29. When the operation switch 23 is turned on, the contact piece 29 connects to the A contact 28. The cooling operation is performed regardless of whether the internal temperature regulator 21 is opened or closed, and the output is output after, for example, 6 hours after the timer motor 26 is driven, and the contact piece 29 changes from the a contact 28 to the b contact 27.
The configuration is such that the cooling operation is performed based on the temperature controller 21 in the refrigerator. In other words, this operating circuit is the cold storage agent 1.
The cooling operation continues at a low temperature below the set temperature of the internal temperature controller 21 until the temperature of the refrigerator 3 is frozen.

Incidentally, the set temperature of the chamber temperature regulator 21 and the output time of the timer device 25 can be variably adjusted according to the season and the like.

Problems to be Solved by the Invention In such conventional cold storage type refrigerators, when the freezing temperature of the cold storage agent is lower than the set temperature inside the refrigerator, the cooling operation is continued until the cold storage agent freezes, so that the temperature inside the refrigerator falls below the set temperature. turn into.

Further, even when the freezing temperature of the cold storage agent matches the set temperature inside the refrigerator, there is a problem in that it is necessary to set the output time of the timer device according to the season.

In view of the above-mentioned problems, the present invention eliminates the need to reset the output time of the timer device according to the season, etc., allows continuous cooling operation until the cold storage agent freezes, and achieves cold storage in a short time until the cold storage agent freezes. It provides a type refrigerator.

Means for Solving the Problems In order to solve the above problems, the cold storage type refrigerator of the present invention has a cooling cycle cooler and a cold storage tank filled with a cold storage agent arranged in a heat transfer manner so that the freezing temperature of the cold storage agent is When the temperature in the refrigerator is near and the cold storage agent is frozen, the electric compressor is continued to be driven for an arbitrary period of time from the first time the refrigerator temperature controller, which constitutes the electric compressor operating circuit, is turned off to cool the cold storage agent. The interior of the refrigerator is cooled and kept cold by using the sensible heat and latent heat generated by solidification or melting of this cold storage agent.

Function: With the above-described configuration, the present invention eliminates the need to reset the output time of the timer device depending on the season, etc., and continuously performs cooling operation until the cold storage agent freezes.

That is, a cooling operation can be performed that gives top priority to freezing the cold storage agent, and the time until the cold storage agent freezes is shortened.

EXAMPLE An example of the present invention will be described below with reference to the drawings.

FIG. 1 shows the configuration of a regenerator refrigerator in an embodiment. Reference numeral 32 denotes a refrigerator body made of a heat insulating box body in which a foamed heat insulating material 35 is injected and foamed between an inner box 33 and an outer box 34, and a heat insulating door 37 with a door backing 36 attached to the top opening can be opened and closed. At the same time, an electric compressor 38 is arranged at the bottom. Reference numeral 39 is a cold storage tank in which the evaporator 42 and the inner box 33 are in contact with each other, and a cold storage agent 40 made of a mixture of carbohydrates and an inorganic electrolyte aqueous solution, etc., whose freezing temperature is close to the temperature inside the refrigerator is sealed inside the bag made of synthetic resin. This is what I did. In order to compensate for the small temperature difference between the cold storage tank 39 and the inside of the refrigerator, the cold storage tank 39 has an uneven shape and is arranged on four sides of the inner box 38 side wall to ensure the amount of heat exchange. When the electric compressor 38 stops operating, the cold energy stored in the cool storage agent 40 is released. 43
is a condenser, and movable casters 41 are provided on the bottom wall. FIG. 2 shows the operating circuit. A thermoswitch 51 is connected in series with the electric compressor 38 to control the temperature inside the refrigerator, and detects the temperature of the cold storage agent 40 . Reference numeral 50 denotes an a contact point of a keep relay 45 connected in parallel with the thermoswitch 51, and when freezing the cold storage agent 40, the electric compressor 38 is driven for an arbitrary period of time after the thermoswitch 51 is turned off for the first time. Let it continue.

A relay 46 is connected in parallel with the electric compressor 38 to detect the first OFF of the thermoswitch 51 and operate the keep relay 45 and timer 44. The keep relay 45 operates the a contact 50 after the b contact 48 of the relay 46 is turned on until the a contact of the timer 44 is turned on. The timer 44 turns on the a contact 4 after an arbitrary time (one hour in this embodiment) after the b contact 47 of the relay 46 turns on.
Operate 9. FIG. 3 shows the temperature characteristics and operating states of each control device when freezing the cold storage agent 40. In this embodiment, the temperature inside the refrigerator is 0°C, and the cold storage agent 40 has a freezing temperature of 0°C. The set temperature of the thermoswitch 51 is set to -1°C to -4°C (return to 0FF) so that the surface temperature of the inner box 33 of the inner box 33 is in a slightly frozen state of -1°C to -4°C. The freezing completion point of the cold storage agent 40 is the 0 point past the latent heat portion, and in order to cool the cold storage agent 40 with top priority on freezing, it is necessary to cool continuously from the initial stage of cooling to the 0 point. Therefore, as a control method, the freezing characteristic of the cold storage agent 40 is such that there is a supercooled part before the latent heat part (0°C), and the freezing property of the cold storage agent 40 is
As the temperature decreases to -6°C to -7°C, the thermoswitch 51 turns OFF at point A, which is before point 0, and the electric compressor 3
8 from stopping, the relay 46 detects point A, the keep relay 45's a contact 50 causes the electric compressor 38 to continue operating, and the timer 44 detects point B (thermo switch 51 returns). The a contact 50 is turned off after an arbitrary period of time (one hour in this embodiment) after that point. As a result, the electric compressor 38 is continuously operated until the thermoswitch 51 is turned off at point D, and the cold storage agent 40 is completely frozen.

Thereafter, the electric compressor 38 is controlled to be turned on and off using the thermoswitch 51 so that the temperature of the inside surface of the cold storage agent 40 is always close to the temperature inside the refrigerator.

As a result, when loading the product onto a truck and using it for small-lot deliveries, it is possible to keep the product cold for about 8 hours after the refrigerator is turned off, which is the time required for delivery. Products can be kept cold while freezing the cold storage agent 40 at night. In addition, the internal temperature at that time is 0.2°C ± 0.2°C, and by keeping the product cold at a stable temperature, the quality of the product can be maintained significantly.

Effects of the Invention As described above, the cold storage type refrigerator of the present invention has a cooling cycle cooler and a cold storage tank filled with a cold storage agent arranged in a heat transfer manner so that the freezing temperature of the cold storage agent is close to the temperature inside the refrigerator, When freezing the cold storage agent, the electric compressor is continued to be driven for an arbitrary period of time from the time when the internal temperature controller that constitutes the operating circuit of the electric compressor is turned off for the first time, and the cold storage agent is cooled. Since the system uses sensible heat and latent heat from solidification or melting of the refrigerant to cool and keep the inside of the refrigerator cold, there is no need to reset the output time of the timer device depending on the season, etc. Continuously perform cooling operation until That is, a cooling operation can be performed that gives top priority to freezing the cold storage agent, and the time until the cold storage agent freezes is shortened.

Additionally, the internal temperature differential is extremely small, allowing products to be kept cold at a stable temperature, greatly improving product quality maintenance.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of a regenerator refrigerator according to an embodiment of the present invention, FIG. 2 is an operating circuit diagram of a regenerator refrigerator according to an embodiment of the present invention, and FIG. 3 is a regenerator refrigerator according to an embodiment of the present invention. A temperature characteristic diagram when freezing the cold storage agent in the refrigerator and a time chart showing the operating status of each control device. Figure 4 is a configuration diagram of a conventional cold storage refrigerator. Figure 5 is an operating circuit diagram of a conventional cold storage refrigerator. It is. 38... Electric compressor, 39... Cold storage tank, 40...
Cold storage agent, 42... Evaporator, 51... Thermo switch.

Claims (2)

[Claims] (1) A refrigeration cycle cooler, a cold storage tank filled with a cold storage agent installed to conduct heat with the cooler, and a storage tank that uses sensible heat and latent heat from solidification or melting of this cold storage agent to cool the inside of the refrigerator. A cold storage refrigerator is characterized by cooling and storing cold. (2) The freezing temperature of the cold storage agent is set to be close to the temperature inside the refrigerator, and when freezing the cold storage agent, the electric compressor is compressed for an arbitrary period of time from the first turning off of the refrigerator temperature controller that constitutes the operating circuit of the electric compressor. A regenerator refrigerator according to claim 1, characterized in that the refrigerator continues to be driven.