JPS5880458A - 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 This invention provides 1'4c of refrigeration equipment connected in parallel to each other.
This invention relates to a rotation control device.

Fig. 1 is a block diagram of a conventional refrigeration system that performs duty cycle control. (2a) (2b) are evaporators connected in parallel to each other installed in the ventilation channels (A1) ω1), (3) are compressors and condensers! A condensing unit consisting of (both shown),
(4a) and (4b) are solenoid valves installed for each evaporator 3 (2a) and (2b) on the outlet side of the condenser (not shown), which detect when the above Suita air temperature exceeds a predetermined temperature. The circuit is opened by the devices (1a) and (1b), and the circuit is closed when the temperature falls below a predetermined temperature. (5a)Qb) is S'' for different predetermined times at different predetermined time intervals.
a) A control device that outputs a signal to open and close (4b), and a signal to close the solenoid valve (4a) e (4b) is a control device (5a) # (5b) is a control device that outputs a signal to open and close the solenoid valve (4a) e (4b).
b) have higher priority. That is, the control device (5a) e
When a signal to close the solenoid valve (4a) e (tb) is output from (5b), even if a signal to open the solenoid valve (4a) e (tb) is output from the detector (1aL (lb)), the solenoid valve (4a) e (4b) will not close. In addition, when the control device (5a) * (5b) outputs a signal to open the 1m valve (4a)/t (4b), the open/close signal from the detector (la)e (1b) causes the 1m valve to open. FNJ to open and close magnetic valves (4a) * (4b)
m.

(6tl) a (6'b) is 1a magnetic valve (4a) (4b
) and the evaporator (2a) (2b), the evaporator)', 8 (2a) (2b), condensing unit t3g, and t￥tfa valve (4a).
(4b) and refrigerant piping, forming a well-known refrigeration cycle.

FIG. 2 is a diagram showing an operation pattern using conventional duty cycle control. Here, two showcases (A) and (B) and one condensing refrigerator unit (3) are shown in a one-turn state, but a larger number of showcases may be connected.

Conventional duty cycle control is such that a control device (5aL (5b)) forcibly controls the duty cycle for a predetermined period of time, such as 4 minutes or 6 minutes out of a period of 82 minutes. The cooling operation of the showcases (4) and (8) is stopped.

Therefore, by the control device (5a) t (5b) provided for each showcase (4), (6), each showcase prisoner Q3) independently controls the solenoid valve (4a) e (4
b) In the opening/closing operation, as shown in Fig. 2, for example, the control device (5) that controls and unloads the showcase (5)
Even if a) issues a signal to forcibly close the solenoid valve (4a) for a specified period of time, the showcase (B) is controlled. ) is forcibly closed for a predetermined period of time [Resentment, solenoid valve (4b
) is opened and closed by the opening/closing signal of the detector (1b), that is, the Suita air temperature of the showcase, so if the Suita air temperature (P) is higher than the set temperature, the solenoid valve (8b)
is open and the condensing unit (3) does not stop. Therefore.

As shown in Fig. 2, a signal to close the solenoid valve (4a) is issued from the control device K (5a) at time C, but it takes time D until the signal to open the solenoid valve (4a) at 1 o'clock. Since the solenoid valve (4b) opens and closes separately at time C-C, the expected stop time D-C of the condensing unit (3) actually occurs between time C-D i! ! ;It will stop only for the time when the B valve (4b) is closed. The same applies when the showcase (B) is controlled. Therefore, the condensing unit (3) shutoff i[11' becomes shorter, and the expected power saving effect cannot be obtained.

Furthermore, as shown in FIG. 8, in a showcase in which the temperature inside the vehicle is relatively high, even if the cooling operation is stopped, the rate of rise in the temperature inside the refrigerator is gradual, and the forced stop time can be set for a long time. On the other hand, in a showcase where the internal temperature is relatively low, the rate of increase in temperature (W) when cooling and one rotation is stopped increases, so the forced stop time must be shortened. Therefore, if multiple showcases with different operating temperatures are used in combination with one condensing unit, the forced stop time of the showcase with a higher internal temperature will be adjusted according to the showcase with a lower internal temperature. will be set, and for showcases where the temperature inside the car is 1 degree higher,
There were disadvantages such as the forced stop time was shortened and the expected power saving effect could not be obtained.

The present invention was made in consideration of the above-mentioned circumstances, and controls the stopping time of the freezer 11 to be as long as possible,
The purpose is to reduce the consumption and effort required for freezing.

Hereinafter, regarding one embodiment of this invention, the fourth factor and the fifty-first factor will be explained.
1 will be explained based on k.

In FIG. 4, (1# is line 1a connecting the control device (5ω (5b)), and as shown in No. 51, at time C, 14il11・■device!
a) When the closing torque (J) is issued, the control device (5b) senses this through the signal line an and closes the solenoid valve (4).
b) is also synchronized and outputs a signal to close. Therefore, since the 7-mi-san valve (4aL (4b)) is closed at the same time, the flow of refrigerant in the refrigeration cycle is cut off, and the suction pressure of the compression shell (not shown) decreases. A low-pressure switch (not shown) that stops the compression alt (not shown) is activated, and the compressor (not shown) is stopped at a time slightly later than time C.The so-called pump The down operation is stopped.Then, at a predetermined time, the control device (5a) closes the solenoid valve (4a).
``W!'', the magnetic valve (Isofune) is opened.As a result, the refrigerant flow is unblocked, and the suction pressure of the compressor (not shown) increases. 'The low pressure switch (not shown) operates in the direction of starting, and the compressor (not shown) starts operating 1ml. 5J control device! (5b)
At a predetermined time F, a signal is issued to open the solenoid valve (4b), the :il valve (4b) is opened, and the showcases (A) and CB) are cooled.

By performing the above control, time C-D11
11.7th, the control device (6a
The compressor (not shown) will be reliably stopped during the overlapped times when the signals for closing the electromagnetic valve (4aL (4b)) p (5b) will stop the compressor (not shown). Also, the control device (5b) will Device(
The same applies when issuing a signal to forcibly close Isofune (4b) prior to step 5a).

As described above, according to the present invention, even when multiple showcases used in different temperature ranges are combined in one condensing unit, the time at which the forced stop is synchronized is synchronized, and the time at which the stop is forcibly canceled. is set individually for each operating temperature range of each evaporator, so the refrigeration system can be stopped for a long time, resulting in power saving effects. Note that similar effects can be obtained even when showcases used in the same temperature range are used in combination.

[Brief explanation of drawings]

Fig. 1 is a groove diagram of a refrigeration system that performs conventional duty cycle control MA rotation, Fig. 2 is a diagram showing an example of an operation pattern using conventional duty cycle control and 1 rotation Iζ, and Fig. 8 is a showcase. Figure 4 is a block diagram of a refrigeration system that performs duty cycle control operation, which is an embodiment of the present invention.
m is a diagram showing an example of an operation pattern based on duty cycle control operation of the present invention. In addition, in the figures, the same reference numerals indicate the same or corresponding parts. In the figure, (A), 03) is a showcase, (1a) p
(1b) is detected! , (3) is a condensing unit,
(4a) (4b) Ha electric Isofune, (5aL (5b) is the control device, GO is the signal line. Agent Shin Kuzuno - Figure 1 Figure 2 Figure 3 - Zuma raw time Figure 4 5 Figures 74 Naked 4 N θFFQN θFF0NContinued from page 1 ■Applicant Mitsubishi Electric Corporation 2-2-3 Marunouchi, Chiyoda-ku, Tokyo

Claims (1)

[Claims] Compression; 4. A refrigeration cycle formed by a condenser, evaporators connected in parallel, solenoid valves and throttle devices respectively provided for each of these evaporators, and each of the above solenoid valves is operated at different predetermined time intervals. and close the circuit with each 14IIB&
A refrigeration system having a control device that opens each solenoid valve after a different predetermined time after the valve closes, characterized in that the control device outputs a signal that synchronously closes each solenoid valve. Refrigeration equipment.