JPS6036846A - Control mechanism of refrigeration cycle - 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 Application of the Invention] The present invention relates to a refrigeration cycle control mechanism for refrigerators and the like, and particularly relates to a refrigeration cycle control mechanism suitable for power saving and improving compressor starting.

[Prior art]

In conventional refrigerators, a control valve is generally not used in the refrigeration cycle. As a result, cooling loss was large and became an obstacle to power saving. On the other hand, due to the high efficiency of compression, the margin for starting torque has become smaller, and there has been a drawback that the engine cannot start unless the pressure balance before and after the compressor is quickly established.

[Object 1 of the Invention] The present invention relates to an improvement in the refrigeration cycle control mechanism of refrigerators, etc., and involves controlling the flow of refrigerant by opening and closing two electromagnetic valves in synchronization with the operation and stop of the refrigeration cycle, thereby preventing heat loss. This aims to save power and improve starting voltage by promoting pressure balance.

[Summary of the invention]

That is, to prevent heat exchange between the condenser and evaporator using the refrigerant when intermittent operation is stopped, the temperature of the evaporator increases and the cooling power decreases (solenoid valve A is installed between the condenser and evaporator). In order to improve the starting voltage by improving the pressure balance before and after the compressor when the compressor is stopped, a solenoid valve B is provided in parallel with the compressor, and the solenoid valves A and B are controlled by a current control element. This allows for the common use of valves.■This is a consumption type of solenoid valve, which reduces the force to an extremely small amount.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. FIG. 1 shows a refrigeration cycle diagram of the present invention, where 1 is a compressor, 2 is a condenser, 3 is a capillary tube, 4 is an evaporator,
5 is a solenoid valve A, 6 is a solenoid valve B, and 7 is a check valve. When the compressor 1 is in operation, the solenoid valve A5 is open, the solenoid valve B6 is idle, and cooling operation is performed in cycle 1-2-5-3-4-7-1. Next, at the same time as the compressor 1 stops, the solenoid valve A5 closes and the solenoid valve B6 opens, preventing heat exchange between the condenser 2 and the evaporator 4, and controlling the pressure before and after the compressor 1 through the solenoid valve B6. It is possible to balance the compressor 1 and improve the restart of the compressor 1. In addition, the high 11M high pressure gas between the compressor 1 and condenser 2 flows through the solenoid valve B6 between the compression P9.1 and the check valve 7, so the pressure after riif of the check valve 7 is opposite to that during operation. The pressure on the compressor 1 side becomes higher than that on the evaporator 4 side, and the check valve 7 becomes a leap. That is, the evaporator 4 is a solenoid valve A5.
Since it is closed between the refrigerant and the check valve 7, the refrigerant can maintain a low IE state, that is, a low 111t state, and can reduce heat loss.

FIG. 2 shows the electrical control circuit of the n'+r solenoid valve A5 and the solenoid valve B6. When the thermostat (which may be a switching element controlled by a thermostat) 8 is turned on, the compressor 1 is operated. Same as ++: ;, give ten confidence to the gate 8a of the current control element 8, and <18 as shown by the solid line arrow.
9 10 14 5a 5L+ -18' and 18-
Current flows through 9-13-17.6b and 6a-18', solenoid valve A5 is opened and solenoid valve B6 is idle. When the thermostat 8 is turned off, the compressor 1 is stopped, and at the same time, a signal is given to the current control element 9, and as shown by the broken arrow, <18'-
3b-5a-] 5-] ], -9-18 and 18'
-6a-6bl, 61291.8, current flows, solenoid valve A5 is closed, and solenoid valve B6 is opened.

That is, the solenoid valve A5 and the solenoid valve B6 have the same structure, and are opened when the current flows in the a-)b direction and closed when the current flows in the b-+a force direction. Note: 10.11.12.13
14.15.16, 17 are current limiting resistors, 18.18'fj power supply.

Next, a structural example of a solenoid valve used in the present invention will be explained with reference to FIG. 19 is a main body with a plunger 20 in its hollow part. Ball 21. It has a spring 22 and a suction element 23, and pipes 24 and 25 are connected above and below the valve 1τ119a. 26 is a yoke for forming a magnetic circuit, 27 is a magnet, 28 is an electromagnetic coil, and lead wires 28a, 28 at the beginning and end of winding are shown.
It has b. Note that the lead wires 28a and 28b correspond to a and b in FIG. 2.

With the above structure, when a current is applied as shown in Fig. 2 (electrical wiring, a-+l), that is, from 28a to 281 in Fig. 3, 20-23
-26-27-20 magnetic circuit is formed and the plunger 20
is attracted by overcoming the force of the spring 22, and the valve 9a opens. Once the plunger 20 is attracted, there is no gap between the plunger 20 and the attractor 22, so the magnetic attraction force due only to the magnet I.27 becomes greater than the force of the spring 22, so even if the electromagnetic coil 28 is turned off, The suction state of the blunt gloss 20 can be maintained.

Next, in FIG. 2, the thermostat 8 is turned off, a signal is given to the current control element 1'9, and the solenoid valve 5 is shown by the broken line <1)→
a, that is, when a current is passed from 28b to 28a in FIG. be released. That is, the valve portion 19a is closed. As described above, the attraction force of the plunger 20 by the magnet is set to be weaker than the spring 22 when released and stronger than the spring 22 when attracted, so that the operation of the plunger 20 is controlled by energizing the electromagnetic coil 28 during both attraction and release. Even after turning off the current, the current state can be maintained, and switching of the electromagnetic valve 5.6 can be made only by reversing the current flow to the electromagnetic coil 28.

Therefore, in Figure 2, when the thermostat 8 is operating, the signal to the current control element T-9 may be sent only once for several pulses, but in consideration of malfunctions, power outages, etc., the signal should be sent repeatedly at regular intervals. Doing so will further improve reliability.

〔Effect of the invention〕

As explained above, the present invention provides a refrigeration cycle in which a compressor 1, a condenser 2, a capillary tube 3, an evaporator 4, and a solenoid valve A5 are connected in series, and a solenoid valve B6 is connected in parallel with the compressor 1. By connecting the current limiting element 7 in series with the valve A5 and the solenoid valve B6, and controlling the solenoid valve A5 and the solenoid valve B6 intermittently, the solenoid valve A5 is closed while the rE compressor 1 is in operation.
When the compressor 1 is stopped, the solenoid valve A5 is turned off and the solenoid valve B6 is opened to prevent high-temperature, high-pressure refrigerant from flowing into the evaporator 4, and to stop the compressor from flowing into the evaporator 4. It is possible to improve the pressure balance around 1. Moreover, since both the solenoid valve A5 and the solenoid valve B6 are operated by the electromagnetic force of the electromagnetic coil 28, they can start the compressor 1 faster than a differential pressure valve or the like.

Since it operates almost simultaneously with the stoppage, there is no risk of a reduction in effectiveness due to delays in opening and closing the valve, and the power consumption of the electromagnetic coil is almost zero, as the energization to the electromagnetic coil 28 is 2 to 3 pulses every few minutes. . In other words, the difference in human power is L [equal to zero as with valves, etc., and the operation is quick and stable as a solenoid valve, so a 1-minute operating force can be obtained, so refrigerant leakage can be reduced, and an efficient power saving effect can be obtained. be able to.

Furthermore, a broken coil 2 for valve switching is attached to the solenoid valve A5 and the solenoid valve B6.
8 and a permanent magnet 27 for maintaining the operating state, and the electromagnetic coil 28 and the current limiting element 9 are connected so that the electromagnetic valve A5 and the electromagnetic valve B6 have opposite polarities.
Compressor 1 due to one current limiting element R・9 and solenoid valve A5 and solenoid valve B6 opening and closing oppositely, so one is always open and the product side of compressor 1 is idle. There is no risk of abnormal temperature rise, etc., and the solenoid valve A5 and the solenoid valve B6 have the same structure, and the wiring of the solenoid coil 28 and the current limiting element 9 is reversed, and the five parts can be used in common. This is advantageous in terms of compatibility of solenoid valves, etc. Furthermore, it has great effects such as no electromagnetic noise due to intermittent energization.

[Brief explanation of the drawing]

FIG. 1 is a refrigeration cycle diagram of the present invention, FIG. 2 is an electric circuit diagram of a solenoid valve section for controlling the refrigeration cycle, and FIG. 3 is a sectional view showing an embodiment of the solenoid valve structure of the present invention. 1. Condenser (number, 2. Condenser, 3. Capillary tube, 4. Evaporator, 5.-Solenoid valve A, 6.-- Solenoid valve B, 5) --- Current control Elusive R-527...Magne 7
1-12 Death...Electric (δ coil.

Claims (1)

[Claims] 1 A compressor (1), a condenser (2), a capillary tube (3), an evaporator (4), and a solenoid valve A (5) are connected in series,
In a refrigeration cycle in which solenoid valve B (6) is connected in parallel with rTE compressor (1), solenoid valve A (5), solenoid valve B (6), and compressor 1 shallow (1) are electrically connected in parallel. At the same time, a current control element (9) is connected in series with solenoid valve A (5) and solenoid valve B (6), and solenoid valve A (5) and solenoid valve B (
Refrigeration cycle control (multi-piece) characterized by intermittent energization control in 6). 2 Solenoid valves A and B (5, 6) are equipped with solenoid coils for valve switching (
28) and a permanent magnet (27) for maintaining the operating state, and the electromagnetic coil (28) is connected to the current limiting element (9) so that the electromagnetic valve A (5) and the electromagnetic valve B (6) are connected to each other. 1 connected so as to have opposite polarity/1: ,7. A refrigeration cycle system 1al1 mechanism according to claim 1. 3. The refrigeration cycle control mechanism according to claims 1 and 2, wherein the solenoid valve A (5) and the solenoid valve B (6) have the same structure.