JPS594858A - Refrigeration cycle device - 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 [Technical Field of the Invention] The present invention relates to a refrigeration cycle device having a function of preventing scattering of defrosting water after defrosting is completed.

[Technical background of the invention]

Generally, examples of refrigeration cycle devices used in refrigerated showcases and refrigerators include those shown in FIG. 1(,)(b). 2 is an internal unit that includes an evaporator 2, an evaporator fan 3, a drain tray 4 for receiving water droplets generated in the evaporator 2,
It has a vibro for heating the drain plate attached to the drain plate 4. Reference numeral 6 denotes an outside unit, which includes a compressor 7, a condenser 8, a condenser fan 9, and the like. However,
Compressor 7, dryer 10. Pressure reducing device such as expansion valve 11
, evaporator 2, and accumulator 12 are sequentially communicated with each other, thereby forming a refrigeration cycle. Further, a hot gas pump circuit 14 is provided between the refrigerant discharge port of the compressor 1 and the refrigerant inlet port of the evaporator 2 via a solenoid valve 13 and the drain plate heating pipe 5.

A thermonunch 16 for termination of registration is attached to the refrigerant outlet pipe of the evaporator 2, and a thermo switch 16 for fan delay is attached to the refrigerant outlet pipe of the evaporator 2.

FIG. 2 shows a control circuit of such a refrigeration cycle device. 20 is a three-phase AC power supply, and the R, S, and T phases of this power supply 20 are connected to a drive motor (hereinafter referred to as compressor motor) 7M for the compressor 7 via a contactor contact 30m and an overload relay 21. is connected. Further, an operation indicator lamp 23 is connected to the R and T phases of the power supply 20 via operation switches 22m and 22b. This lamp 23 is connected to a discharge display lamp 24 and a discharge resistor 2 through a relay contact 32h.
Parallel circuit with 5, high voltage nutte 26 and overload relay contact (manual return type), ) Ja'! i = Parallel circuit of abnormality display lamp 27 and abnormality notification buzzer 28, high pressure switch 26, overload relay contact 211L
, and an electromagnetic contactor 30 via a thermostat 29 for temperature adjustment.
．． A defrosting timer 31, a parallel circuit between the solenoid valve 13 and the relay 32 via a timer contact 31h and a relay contact 33m, a timer contact 31as, a relay contact 33a1, a relay contact 33b, and the defrosting termination thermoswitch 15. A relay 33 and a relay 34 are connected through a parallel circuit with the fan delay thermoswitch 16 and a relay 34, respectively. Therefore, the relay contact 3 is connected to the operation switch 22a.
4 a + J 2 b via the evaporator fan 3
One end of the drive motor (hereinafter referred to as fan motor) 3M is connected, and the other end of this fan motor 3M is connected to the power supply 200.
Connected to R phase. Furthermore, a crankcase heater 35 of the compressor 7 is connected to the R and T phases of the power source 20 via a contactor contact 30b. Further, one end of the fan motor 9M of the condenser fan 9 is connected to the T phase of the power supply 20 via the relay contact 32a, and the other end of the fan motor 9M is connected to the R similar line of the compressor motor circuit. Ru.

In addition, each electrical device in this control circuit is actually stored and wired in the electrical parts box and control box, respectively, and the wiring between the electrical parts box and the control box is subject to product decommissioning. At times, the terminals provided in the electrical parts box ■, ■, ■, ■, ■, ■
.

Connections 5 are made between ■, ■, ◎ and terminals ■, ■, ■, ■, ■, ■ provided on the control box.

Therefore, when the operation switches 22a, 22b are turned on, the electromagnetic contactor 30 is activated, the compressor 7 starts operating, and the condenser fan 9 starts operating. In this way, the cooling operation is first started. However, in this case, since the temperature of the refrigerant inlet pipe of the evaporator 2 is still 0° C. or higher, the fan delay thermoswitch 16 is turned on, and the evaporator fan 3 is not operated by the operation of the relay 34. Thereafter, when the temperature of the refrigerant inlet pipe of the evaporator 2 falls below 0°C, the fan delay thermoswitch J6 is turned off, the operation of the relay 34 is stopped, and the operation of the evaporator fan 3 is started. Cold air is blown into the refrigerator for the first time.

On the other hand, the defrosting timer 31 is operating at the same time as the operation switches 22 m and 22 b are turned on, and the other timer 31 a
When the O timer contact 31a, which is turned on periodically for a certain period of time, is turned on, the solenoid valve 13 is opened and the hot gas bypass circuit 14 is opened, and high temperature gas refrigerant is supplied to the evaporator 2, and the relay 32 is turned on. operates and contacts 32b.

, 92c is turned on, the operation of the fan 3.9 is stopped. In this way, the cooling operation is interrupted and the defrosting operation is started. When the defrosting operation is performed, first, the temperature of the refrigerant inlet pipe of the evaporator 2 becomes 0° C. or higher, and the fan delay thermostat is turned on. Furthermore, as defrosting progresses, the temperature of the refrigerant outlet pipe of the evaporator 2 also rises, and when the temperature rises to about 7°C to 10°C, the defrosting termination thermoswitch 15 is turned on. When the thermonunch 15 is turned on, the relay 33 is activated, and when the contact 33ta is turned on, the electromagnetic valve 13 is closed and the relay 32 is deactivated. When the magnetic valve 13 closes, the hot bypass circuit 14 is cut off, and when the relay 32 stops operating, the condenser fan 9 starts operating. In this way, the defrosting operation is completed and the cooling operation is restarted. However, in this case, the temperature of the refrigerant inlet pipe of the evaporator 2 does not immediately drop below 0°C, and the fan delay switch 16 remains on, so the relay 34 remains in operation. Even if the relay 32 stops operating and the contact 32b turns off, the evaporator fan 3 will not operate. Therefore, problems such as defrosting water scattering into the refrigerator are prevented. Thereafter, when the temperature of the refrigerant inlet pipe of the evaporator 2 drops to 0° C. or lower, the fan delay thermoswitch 16 is turned off and the operation of the relay 34 is stopped, thereby stopping the operation of the evaporator fan 3. It is restarted and cold air is blown into the refrigerator for the first time.

[Problems with background technology]

Incidentally, in such refrigeration cycle equipment, the timing for restarting the evaporator fan based on prevention is determined by a dedicated thermoswitch, but the number of thermoswitches is directly linked to cost and failure rate. Well, there was room for improvement in that regard.

[Purpose of the invention]

This invention was made in view of the above circumstances, and its purpose is to adjust the timing of defrosting completion and the restart timing of the evaporator fan based on the prevention of defrosting water scattering to one time.
It is an object of the present invention to provide a refrigeration cycle device that can be obtained with one thermoswitch, thereby making it possible to reduce costs and failure rates.

[Summary of Full Day and Moon]

The present invention provides a thermoswitch that senses the temperature of refrigerant flowing into an evaporator and the temperature of refrigerant flowing out from the evaporator, and has an operating point and a return point different from each other with respect to the sensed temperature. The operating point and the return point are the defrosting end timing and the evaporator fan opening timing, respectively.

[Example of registration]

Hereinafter, all 101 embodiments will be explained with reference to the drawings. In this case, the same parts as in FIGS. 1(,)(b) and 2 are designated by the same reference numerals, and detailed explanation thereof will be omitted.

As shown in FIGS. 3(a) and 3(b), the evaporator 2 has a refrigerant inlet and a refrigerant outlet arranged side by side. Thus, the refrigerant inlet pipe A and the refrigerant outlet pipe B are arranged close to each other, and the thermoswitch 40 is placed in contact with both pipes.
is provided. This thermoswitch 40 senses the temperature of the refrigerant flowing into the temperature ramp evaporator 2 of pipe A and the temperature of the refrigerant flowing out from the temperature ramp evaporator 2 of pipe B.
Different operating (on) points for the sensed temperature 1.
and return (off) point t! It has a sensing temperature of 1. ℃ (for example, 30℃), it turns on, and from that state the sensed temperature becomes t! It turns on when the temperature drops to .degree. C. (for example, 20.degree. C.).

Thus, the control circuit is constructed as shown in FIG.

That is, instead of the fan delay thermoswitch 16, the thermoswitch 40 is inserted into the energizing path for the relay 34. Also, instead of the defrosting termination thermo switch 15, the relay contact 34b of the relay 34 is connected to the relay contact 33.
b in parallel.

Next, the operation of the above configuration will be explained with reference to FIG.

1. When you turn on the operation switches 22m and 22b,
When the electromagnetic contactor 30 operates and the compressor 7 starts operating, the condenser fan 9 starts operating. In this way, the cooling operation is started, but at this time, since the temperature of the refrigerant inlet pipe A of the evaporator 2 is around room temperature V, the temperature sensed by the thermoswitch 40 is higher than t,°C. The thermo switch 40 is turned on, the relay 34 is operated, and the contact 34h is turned on, so that the evaporator 7-an 3 is not operated. After that, the refrigerant inflow schedule of the evaporator 2]A
Even if the temperature of t! When the temperature drops below CJ5, the thermo switch 40 is turned off, the relay 34 stops operating, and the evaporator fan 3 starts operating, and cold air is forced into the refrigerator for the first time.

On the other hand, the defrosting timer 3 is operating at the same time as the operation switches 22a and 22b are turned on, and the timer contact 31a is periodically turned on for a certain period of time.

When the timer contact 91a turns on, the i&valve 13 opens and the hot gas bypass circuit 14 becomes conductive, supplying high-temperature refrigerant to the evaporator 2, and the relay 32 operates and contacts 32b and When 32c is turned on, the operation of Sifan 3.9 is stopped. In this way, the cooling operation is in the middle FIJ1, and the defrosting operation is started. When the defrosting operation is performed, the temperature of the pipe A rises, and as the defrosting progresses, the temperature of the pipe B also rises, and when the temperature sensed by the thermo switch 40 exceeds tI°C, the thermostat Switch 40 is turned on. When the thermo switch 40 is turned on, the relay 34 is operated and the contacts 34a and 34b are turned on, and when the contact 94b is turned on, the relay 33 is turned on.
works.

When the relay 33 operates, the contacts 33h and 33b turn on, and when the contact 33a turns on, the solenoid valve 13 closes and the relay 32 stops operating. By closing the solenoid valve 13, the hot 1724792 circuit 14 is cut off. When the relay 32 stops operating, the contact 32b.

32c is turned off, and the operation of the condenser fan 9 is restarted by turning off the contact 32c. In this way, the defrosting operation is completed (11 hours after the start of defrosting), and the cooling operation is restarted. However, in this case, the temperature sensed by the thermoswitch 40 does not fall below t2°C, so the thermoswitch 40 remains on and the relay 34 operates.
Even if the contact point 92b is turned off, the evaporator fan 3 will not operate. Therefore, the defrosting water generated by the defrosting operation does not scatter into the refrigerator. After a certain period of time (12 hours after the end of defrosting), the temperature sensed by the thermoswitch 40 drops to below t.degree. C., which turns off the thermoswitch 40 and stops the operation of the relay 34.

When the relay 34 stops operating, the contact 34a.

34b is turned off, and the contact 34a is turned off to restart the operation of the evaporator fan 3, and cool air is blown into the refrigerator for the first time. In this case, even if the contact 34b is turned off, the operation of the relay 33 is self-maintained by the contact 33b being turned on, so the desizing operation will not be restarted even if the defrost timer 3 is within the time safe. .

When the cooling operation is restarted, the defrosting timer 31 starts the defrosting operation again, and the above operation is repeated.
7ru.

In this way, a thermoswitch 40f is provided which senses the temperature of the refrigerant inlet pipe A and the refrigerant outlet pipe B of the evaporator 2, and has a different operating point and return point with respect to the sensed temperature. Since the operating point is set at the end of removal from the register, and the return point is set at the time when the evaporator fan 3 resumes operation based on the prevention of all defrosting water scattering, only one thermoswitch is required, which reduces costs and failure rate. Needle pricks. Moreover, the operating point tI°C of the thermoswitch 40 is, for example, 30°C, and the return point t3°C is, for example, 20°C.
℃, and controls at a higher temperature than conventional thermoswitches 15 and 16, so malfunctions will not occur even if there is a short-term temperature change due to the opening of the door inside the refrigerator, etc. It never happens.

Note that this invention is not limited to the above embodiments, and can be applied not only to refrigerated showcases and refrigerators, but also to air conditioners, and can be modified and implemented in various ways without changing the gist. be.

〔Effect of the invention〕

As described above, according to the present invention, the defrosting end timing and the restart timing of the evaporator fan based on the prevention of defrosting water scattering can be obtained with a single thermoswitch. It is possible to provide a patented Yaykle device characterized by rate reduction.

[Brief explanation of the drawing]

Figure 1 (a) (b) ld: Shows an example of a conventional device. (a) is a schematic diagram of the external appearance, (b) is a concrete diagram of the configuration of (,), and Figure 2 is a diagram of the first Figure 3(a) shows an embodiment of the present invention, (a) is a block diagram, and (b) is a block diagram of a sub-circuit. ), and Figure 4 shows the control of the same sister example (b).
FIG. 5 is a diagram showing temperature changes for explaining the operation of the same embodiment. 2...Evaporator, 3...Evaporator fan, 7...Compressor, 8...Na condenser, 74...Hot subainocess circuit, A...Refrigerant inlet pipe, B...・Refrigerant outlet piping, 40...Thermoswitch. Applicant's agent Suzue Takehiko Figure 1 (a) Figure 2 Figure 3 (a) (b) Δ Figure 4 Figure 5 Procedural amendment document Showa 1947 August-8 Patent Office Director Kazuo Wakasugi 1, Indication of the case, Patent Application No. 112989/1989 2, Name of the invention Refrigeration cycle device 3, Relationship with the Nagisa case to be amended Patent applicant (307) Tokyo Shibaura Electric Co., Ltd. 4, Attorney Person 7, Contents of the amendment (1) Between the 18th and 19th lines of page 7 in the specification section, it is stated that ``In addition, as related to such a refrigeration cycle device, Japanese Utility Model Publication No. 55-10857 and Jikko 55-
A technique disclosed in Japanese Patent No. 36770 is known. ” Add the sentence. (2) 1 in the first line of page 8 of the booklet (Jikko Sho 55-
10857, Utility Model Publication No. 55-36770, etc.)" is deleted.

Claims (1)

[Claims] A refrigeration cycle consisting of a compressor, a condenser, a pressure reducing device, an evaporator, etc. connected in sequence, and a hot spring provided between the refrigerant discharge port of the compressor and the refrigerant inlet of the evaporator run through a spinosuos circuit. In a refrigerating cycle system in which H is removed from the evaporator by making the evaporator bypass circuit conductive and stopping the operation of the evaporator fan installed near the evaporator, the hot water flows into the evaporator. A thermoswitch that senses the temperature of the refrigerant flowing out from the evaporator and the temperature of the refrigerant flowing out from the evaporator, and has a different operating point and return point with respect to the sensed temperature, and a thermoswitch that detects the operating point and return point of the thermoswitch, respectively. 1. A refrigeration cycle apparatus, comprising: a control means for determining an end timing and a restart timing of the evaporator fan.