JPS5941764A - 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) Field of the Invention The present invention is concerned with energy saving of equipment equipped with a refrigeration device for cooling a predetermined area, such as a refrigerator, a freezer, or a showcase, to above or below the freezing point.

(b) Background art and its problems Figure 1 shows a refrigerant circulation circuit of a refrigeration system, and the refrigerant is electrically compressed 4ffi! (1), condenser (2), solenoid valve (5), capillary tube (3) as a pressure reducing device, evaporator (4)
), the non-return valve (6) and returns to the electric compressor (1). Figure 2 shows the control circuit, where θ
This is a temperature control device that directly or indirectly senses the temperature of a cooled part, such as a commercial AC power supply or the inside of a refrigerator, and opens and closes the contacts. If the cooling air is circulated by air, it may be provided in the cold air blowing section to the cooled part or in the evaporator (4), as long as it can substantially control the temperature of the cooled part. (14) is the evaporator (4
), (15) is a temperature control device (a defrost timer that integrates the closing time of I31, (t(9 is the evaporator (4)
) is a defrosting termination thermostat that terminates defrosting.

In this configuration, when the power supply is applied, if the part to be cooled is not cooled to the predetermined lower limit temperature, the temperature control device ((3) closes the y point and the timer (151 switch (15A) Compressor 1), 1 valve (5
), the solenoid valve (5) opens the refrigerant passage (at the same time, the electric compressor (1) starts and the part to be cooled is cooled. The part to be cooled is cooled and the upper limit setting humidity of the temperature control device 03 is set). When the temperature control device 0 (3) is opened, the electric compressor (1) stops operating, and the solenoid valve (5) is de-energized. c, the refrigerant passage is closed. Then, once again, the temperature of the cooled part rises to 2 degrees and reaches the upper limit setting humidity of the temperature control device ρ (13), the temperature control device 03) closes, and the electric compressor (1) is energized and starts operating. Restarted, and the solenoid valve (5) again, Iri] city,
to open the cold 111 passage (.In this way, the temperature control device (1
In step 3), the electromagnetic valve (5) and the N dynamic compressor (1) are simultaneously controlled to be energized and de-energized to maintain the cooled portion within a predetermined temperature range.

In this configuration, the solenoid valve installed is to close the solenoid valve (5) to separate the pressure between the high pressure side and the low pressure side of the refrigerant circuit after the compression stroke (1) of Shimokun 11 is stopped, and the low pressure Refrigerant gas flows into the evaporator (4) on the side, causing a large temperature rise in the evaporator and a large temperature rise in the cooled part. (・In other words, this large temperature difference is due to the short stop time of the electric compressor (1), which results in poor operation efficiency and increased power savings (inversely). If the compressor of the electric compressor is a reciprocating type, the stop valve (6) is not necessary because the pressure IQFI is applied between the discharge side (high pressure side) and suction side (low pressure side) of the compressor using the valve inside the compressor. However, in the case of a rotary type, it is necessary to install a check valve (6) to separate the pressure between the high pressure side and the low pressure side of the refrigerant circuit. .

However, by separating the pressure, when the electric compressor (1) is restarted, the compression ratio increases and the load increases, so it is necessary to increase the output to increase the torque of the electric motor of the electric compressor (1), and the input voltage increases. This is not preferable in terms of power saving. In addition, as an energy saving measure for the electric compressor itself, it is necessary to develop a highly efficient compression section, but since development takes a considerable amount of time, the shortcut is to use a low torque electric motor. For this reason, an attempt is made to save energy by using a motor with a capacity as small as 1f that can be started, but as mentioned above, if the compression ratio at restart increases, the torque of the motor cannot be reduced.

(c) Purpose of the Invention The present invention provides a solenoid valve to keep the high pressure side and low pressure side of the cooling and cooling equipment in a separated state while the electric compressor is stopped, and the temperature side N.
IF when controlling the operation and stop of the electric compressor in the device
To provide a refrigeration system capable of saving energy by enabling sufficient startup of an electric compressor motor even if the capacity thereof is small.

2) Embodiment of the invention FIGS. 3 and 4 show control circuits, and the same reference numerals as in FIGS. 1 and 2 indicate the same components, and FIG. 1 is the same as the embodiment of the present invention. Use it as is. The difference from Fig. 2 is that a delay timer (21) is provided, and when the temperature control device (1 (g)) is closed, the solenoid valve (5) is energized and the delay timer (21) starts, causing a slight delay. The electric compressor (1) is configured to start after a certain period of time.This delay timer (c21) may be a combination of an electric motor and a cam switch, but FIG. 21).

In this case, (221 is an electric transformer? rA degree control device (13) and removal i't E47 (15) Nosui
The energization is controlled to open and close the gates (1,', +A). (
2 (material) is a rectifier circuit for 1α current voltage output connected to the secondary side of the transformer (ground). (24+ is an operational amplifier circuit, and one reference input line (S't is a resistor (25) (, !I
i) is connected to the other measurement input line (11
) has a resistance C'? ) and the refined output of the integrating circuit of the capacitor (28). (2'l) is an operational amplifier circuit (
It is a relay that is excited by the output of 24) and closes the groove (29A).

In this circuit, the defrost timer (15) switch (
15A) is closed as shown in the figure, and the part to be cooled is cooled at the lower limit set temperature I, temperature control 1, minato ((3) is open. , transformer (2
No power is applied to 7), relay C29) is de-energized and switch (29Δ) is open. For this reason, the electric compressor (1) is stopped and the solenoid valve (5) is de-energized and closed. Now, when the temperature of the cooled part reaches the upper limit set humidity, the temperature control device α3) closes, energizes the solenoid valve (5), opens the cold left passage, and connects the high pressure side and the low pressure side to achieve pressure balance. try Along with this, a VC power transformer (power supply (121) is applied to the ribs, and In'5 jli: I!-!
I! +'8723:4 wotsu L te:1n-f y
'71 of the standard human power line (S) when the sa (2R) is charged,
When the potential of the measurement input line (11) reaches the position, the output of the arithmetic amplification circuit j'3 (24) is generated and the relay (2!
II is energized, its switch (29Δ) is closed, and the electric compressor (1) starts operating j7). That is, the electric compressor (1) starts with a delay from the passage of the solenoid valve (5). This delay time may be relatively short, and if it is on the order of tens of seconds to several minutes, the temperature of the cooled part will not rise too much due to the rise in the temperature of the evaporator (4).

2. Good results can be obtained with a typical household cold compressor with a delay time of about 30 seconds to 3 minutes. I'm near.

In this way, if a lightning valve is installed between the condenser and the Masudaso E pipe, and the temperature control device is turned on and off, the energization and de-energization will be performed a little later than the solenoid valve's 8:00 o'clock. Since the electric compressor is 0N-1-, a small-capacity one with low torque is sufficient as the motor for electric compression (1, , the time it takes for both valves to open and cooling operation to start, that is, for the evaporator to start cooling, is known, and the temperature rise in the evaporator is also quite large. It's not something you should give away.

Note that the delay timer (21) and the temperature control device (13) are not limited to the embodiments, but may also be achieved with a contactless electronic circuit configuration. When the condenser (2) is forced air-cooled, the fan motor may be connected in parallel with the electric compressor (1).

Further, in the present invention, when the flaking timer (15) reaches a predetermined value, the switch (1, 5A) is switched from the state shown in FIG. ) is closed, the thermostat l-(+6) is opened at a high temperature due to the completion of the evaporator (4), and the thermostat l-(+6) is opened (thereby, the evaporation by the heater 11) is completed, and the electric motor (151) of the timer (151) is turned on. ], 5r3) and the heater (14), a motor (
15) Since most of the power supply voltage is applied to 3), the electric motor (
1511) rotates, and the switch (15A) is returned to the state shown in FIG. 3 by the cam operated by it. After the solenoid valve (5) is energized again upon this return, the electric compressor (1) is started with a delay due to the operation of the timer (21). Therefore, even after the shin removal operation, the same effect as in normal cooling operation can be obtained.

(E) Effects of the Invention In the present invention, the start of the electric compressor is slightly delayed from the opening of the cooling passage of the solenoid valve, so the startability of the electric compressor is improved and the rise in temperature of the evaporator is also suppressed. The increase in the refrigeration load can also be suppressed, the operating efficiency of the refrigeration system fl can be improved, and an energy saving effect can be obtained.

[Brief explanation of drawings]

The 11th morning is a cold W circulation circuit diagram of frozen prefectural bonds, Figure 2 is an electric circuit diagram of the background technology, Figure 3 is an electric circuit diagram of the present invention, and the fourth is 1, which is equipped with the delay timer of the present invention. FIG. (1)...Electric compressor (2)...Condenser (
3)...Pressure reduction device (4)...Evaporator (5)
... Solenoid valve (13) ... Temperature control device (2
1) Delay timer applicant Sanyo Deniso Co., Ltd. and one other representative Patent attorney Shizuo Sano 307 Figure 3 Figure 2

Claims (1)

[Claims] 1. An electric compressor, a condenser, a pressure reducing device, and an evaporator are connected so that refrigerant flows and returns to the electric compressor, and the refrigerant passage between the condenser and the pressure reducing device is energized to open the refrigerant passage and shut it off. A solenoid valve that closes a refrigerant passage when energized is provided, and the operation of the electric compressor and the energization of the solenoid valve are controlled by a temperature control device of a cooled part, wherein the temperature control device detects an upper limit set temperature. A timer is provided to maintain a delay time of several tens of seconds to several minutes, and the temperature control device controls energization and de-energization of the electromagnetic valve, and the electric compressor is started after the delay time by the timer. Refrigeration equipment configured to stop when the temperature control device detects the lower limit set temperature.