JPS604777A - Device for instructing defrostation - 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 Field of Industrial Application The present invention relates to a defrosting control device that uses an electronic counter as a timer to issue a defrosting command to a refrigeration system, heat pump, etc. Traditionally, in refrigeration equipment, such as refrigerators, the frost that forms in the cooler is defrosted using an electric heater, etc., by adding up the operating time of the compressor for a predetermined amount of time using an electronic counter, then issuing a box removal command. .

A conventional defrosting device will be explained with reference to FIG. 1. In the figure, 1' is a pulse source that generates pulses in synchronization with a refrigerant compressor (not shown), and 2' is an electronic counter that counts the number of pulses output from the pulse source 1'. 3'
1 is a frequency divider that divides the pulse from the pulse source 1' by 1/2, and is connected to the electronic counter 1 through a selection means 5' such as a thermostat that switches the contact piece 4' according to the refrigerant condensing temperature. -I am. In addition, when the outside temperature is high, the output of the food is frequently lost, and an excessive heat load is placed inside the refrigerator, which increases the heat absorption load and raises the refrigerant evaporation temperature, which further increases the refrigerant condensation temperature. is greater than the set value, contact piece 4'
is on the high temperature contact H side.For example, 60H from pulse source 1'
When the z pulse is output, csoHz is the electronic counter 2.
On the contrary, when the condensing temperature is below the set value (when it is cold), the contact piece 4' switches to the low temperature contact side, and the frequency divider 3' reduces the condensing temperature by half. The 30H2 pulse becomes the input to the electronic counter 2'. When the electronic counter 2' completes a predetermined count, the defrosting signal 6'
was what was being emitted. This defrosting device issues a defrosting command when the operating time of the compressor is accumulated for a predetermined amount of time regardless of the condensing temperature. Defrosting commands were issued accurately according to the situation, and wasteful defrosting was less and more efficient. However, since the set temperature T'C is determined to correspond to high outside temperatures when the overload occurs, if food is frequently put in and taken out or an excessive heat load is put into the refrigerator at low outside temperatures, The condensing temperature did not suddenly rise above the set value. Therefore, even though the electronic counter should normally be running at a fast speed of eoHz, the contact 4' was on the L side and was counting at the same speed as when food was being taken in and out infrequently. For this reason, when the outside temperature is low, it is not possible to issue an accurate defrosting command according to the usage status of the refrigerator, so it is necessary to set the electronic counter in accordance with the frequent loading and unloading of food or when an excessive heat load is applied at low outside temperatures. There was a problem that the number of counts had to be reduced.

Purpose of the Invention The present invention eliminates wasteful defrosting by selecting the number of input pulses of the electronic counter according to the outside air temperature or humidity and the condensation temperature of the refrigerant when integrating the operating time of the compressor using an electronic counter. The purpose is to prevent wasted power consumption and increase in internal temperature to the necessary minimum.

Structure of the Invention In order to achieve this object, a means is provided for selectively inputting pulses generated in accordance with the operation of the compressor to an electronic counter at the condensation temperature of the refrigerant, and a set value for the condensation temperature at the outside air temperature (or humidity). The integrated operating time of the compressor until defrosting changes depending on the outside air temperature (or humidity) and the condensing temperature.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to FIG. Reference numeral 1 denotes a pulse source obtained by dividing the commercial voltage and subjecting it to half-wave rectification, and is designed to generate e o Hz pulses in conjunction with the operation of a compressor (not shown). 2 is an electronic counter into which the above pulse is input. 3 is a frequency divider that reduces the frequency of the pulse source to 1/2, and 6 is a selection means such as a thermostat that switches the contact piece 4 according to the refrigerant condensation temperature. Switches to contact H. θ is a defrosting signal output multiple times by the electronic counter 2. Reference numeral 7 designates a first thermostat, such as a thermostat, which closes when the outside air temperature falls below a predetermined temperature of 12°C, and 8 designates a second thermostat, such as a thermostat, which closes when the refrigerant condensation temperature exceeds a predetermined temperature of 13°C. However, T1>T3
Set it to .

Then, the first thermostat 7 and the second thermostat 8
and form a switch 9.

Next, the operation of the above configuration will be explained. When the outside temperature is low, below 12°C, the first thermostat 7 is closed, and at this time, if food is frequently put in and taken out or an excessive heat load is applied, the condensation temperature rises due to the above reasons, and the predetermined temperature exceeds 13°C. When the temperature reaches 6o H, the second thermostat 8 closes, for example.
A pulse of z is input to the electronic counter 2. Then, when the condensation temperature is below T3°C, the selection means 6 selects the low temperature contact L111.
When tl is closed, the pulse is passed through frequency divider 3 to 30H.
It is input to the electronic counter 2 at z. Also, the outside temperature is 12
At a high outside temperature of .degree. C. or higher, the selection means 6, in which the condensation temperature becomes a predetermined temperature T1.degree. C. or higher in an overloaded state, closes the high temperature contact H side and inputs an eoHz pulse to the electronic counter 2. Further, if there is no overload condition and the condensing temperature is 14° C. or lower, the selection means 6 closes the low temperature contact side and connects the selection means 6 to 30
A Hz pulse is input.

Therefore, defrosting commands can be issued accurately depending on the frequency of food loading and unloading and the degree of heat load put into the refrigerator, not only when the outside temperature is high but also when the outside temperature is low, eliminating wasteful defrosting throughout the year. It is possible to reduce frost, minimize waste of power consumption, and adverse effects on food due to temperature rise inside the refrigerator.

In the embodiment, the first thermostat is used as a thermostat that detects outside air temperature, but it may also detect outside air humidity.

Next, another embodiment will be described with reference to FIG.

In the figure, 1o is a multiplier that doubles the frequency.

A pulse source 1 is connected to the input end of this multiplier 1o.

The output of the multiplier 10 is the high temperature contact H of the selection means 6.
is input to the electronic counter 11 via the side. Also,
The pulse source 1 is connected via the cold contact side of the selection means 6 to 1. and is input to the electronic counter 11. Further, a switch 9 consisting of a first thermostat 7 and a second thermostat 8 is connected to the selection means 6.

Therefore, when the outside temperature is low (12°C or less), the first thermostat 7 closes, and if food is frequently put in and taken out, the condensing temperature rises due to excessive heat load, and the predetermined temperature 13
When the temperature exceeds .degree. C., the second thermostat 8 closes. Therefore, when the pulse source 1 has a frequency of 60 Hz, a frequency of 120 f (z) is input to the electronic counter 11 via the multiplier 1o.

When the condensation temperature is below 13° C., the 60 Hz frequency of the pulse source 1 is input to the electronic counter 11 via the low temperature contact side of the selection means 6. In addition, at a high outside temperature of 12°C or higher, the condensation temperature is set to a predetermined temperature T1 in an overload state.
℃ or higher, the high temperature contact H side of the selection means 6
The frequency of 0H2 is input to the electronic counter 11. That is, the time required for the output of the electronic counter 11 to reach the output can be set to be the same as the time until the output of the electronic counter 2 described above, and the defrosting command can be accurately issued depending on the degree of heat load.

In addition, the defrosting may be completed using a conventionally known bimetal system, timer system, or a combination thereof, and since it is not directly related to the present invention, a description thereof will be omitted.

Effects of the Invention As is clear from the above-mentioned embodiments, the present invention is effective not only at high outside temperatures but also at low outside temperatures, depending on the frequency of loading and unloading of food and the degree of heat load put into the refrigerator. Defrosting commands are accurately issued by changing the number of pulses sent to the electronic counter, reducing unnecessary defrosting throughout the year and minimizing wasted power consumption and adverse effects on food due to temperature rise inside the refrigerator. I can do it.・

[Brief explanation of drawings]

Fig. 1 is a block diagram of a defrost command device used in a conventional refrigeration system, Fig. 2 is a block diagram of a defrost command device used in an embodiment of the present invention and a refrigeration system, and Fig. 3 2 is a block diagram of a defrosting command device showing another embodiment corresponding to FIG. 2; FIG. 1... Pulse source, 2.11... Electronic counter, -3... Frequency divider, 5... Selection means, 9... Mountain switch, 1o・・・・・・Tai multiplier.

Claims (1)

[Claims] A pulse source that generates a first pulse; a frequency divider or multiplier that divides or multiplies the first pulse to generate a second pulse; and a frequency divider or multiplier that generates a second pulse, and a selection means for detecting and selecting the first and second pulses; a sicrant operation is performed by the first and second pulses via the selection means; and a defrosting command is issued after a certain period of time; A defrosting command device comprising an electronic counter that outputs a value, and a switch that prioritizes the first pulse based on the condensation temperature of the refrigerant and the outside temperature or humidity.