WO1984003138A1

WO1984003138A1 - Defrosting apparatus for gas cooling device

Info

Publication number: WO1984003138A1
Application number: PCT/JP1984/000031
Authority: WO
Inventors: Takashi Yamamoto; Kesao Katsuyama; Ryoji Kobayashi
Original assignee: Orion Machinery Co Ltd
Priority date: 1983-02-03
Filing date: 1984-02-01
Publication date: 1984-08-16

Abstract

A defrosting apparatus removes frost formed on an evaporator (26) of a refrigerant circuit consisting of a compressor, a condensor, a pressure-reducing mechanism, and the evaporator connected in sequence. The gas flow path of the apparatus is divided into a plurality of branch flow paths (21) by partition plates (22). Each branch flow path is provided with an opening/closing means (23) which opens and closes it. When frost has formed on one evaporator (26) within one branch flow path, that branch flow path (21) is closed by the corresponding opening/closing means (23), and the evaporator (26) with frost thereon is defrosted by heating means, thereby enabling highly-accurate temperature control without the need of suspending the operation of the cooling device.

Description

Defrosting device for fine gas cooling device Technical field

In this paper, cooling is performed by providing an evaporator in the refrigerant passage formed by connecting a compressor, a condenser, a decompression mechanism, and an evaporator in the gas flow path. Evaporator of gas cooling device The present invention relates to a device for removing frost formed on the surface of an evaporator.

Background technology

In general, when moisture contained in a gas such as air frosts on the fins of the evaporator, the heat exchange efficiency decreases, and the gas does not fall to a predetermined temperature, and the time required to carry the compressed paste is long. However, problems such as large power consumption occur. For this reason, in the past, the following method was used for tanning.

Figure 1 shows the first prior art example, where 1 is a compressor 2, a condenser 3, a pressure reducing mechanism consisting of a capillar tube 4, a vaporizer 5, a compressor-a condenser and a pressure reducing mechanism, and a vaporizer. The evaporator 5 is provided in the gas flow path 8, which is a refrigerant circuit composed of a hot gas bypass pipe 7 that communicates with other devices via an electromagnetic valve 6. Reference numeral 9 is a temperature detector mounted on the fin surface of the cooler, and 10 is a defrost controller that controls the blower 11 and the solenoid valve 6 by the signal of the temperature detector 9.

In the first conventional example configured as described above, if frost forms on the evaporator 5, heat exchange with gas is not performed. Therefore, the surface of the evaporator will be at a lower temperature than it would be if normal exchange was performed normally. Then, when it is confirmed that the temperature becomes lower than that set by the temperature detector 9 provided on the surface of the evaporator 5, the solenoid valve 6 is opened by the defrost controller 10 and the blower 11 is turned on. Be stopped. With these, the high-temperature refrigerant discharged from the compressor 2 flows into the evaporator 5 and defrosts. Then, when the surface of the evaporator 5 reaches the set temperature on the high temperature side, the solenoid valve 6 is closed and the blower 11 is carried to restart the normal cooling operation.

Although the first conventional example that operates as described above has the advantage that the number of parts is small and the structure is simple, it is impossible to keep the cooling air temperature constant because the cooling operation stops during defrosting. There was also a limit to the temperature at which cooling was possible.

Next, the second conventional technique will be described with reference to FIG. 2. In this conventional example, the gas passage is divided into two, two refrigerant passages are also provided, and each evaporator has its own gas passage. However, the compressors 2a and 2b, the condensers 3a and 3b, the pressure reducing mechanisms 4a and 4b, and the vaporizers 5a and 5b are provided in the gas flow paths 8a and 8b divided into two parts. 12a and 12b are dampers whose opening and closing are controlled by the defrosting controller 10, and 13a and 13b are electric heaters which are also controlled by the defrosting controller 10.

In the second prior art example configured as described above, two refrigerant surface passages are alternately transported. That is, when one is being cooled, the other compressor 2b is stopped and the gas flow path 8b is closed by the damper 12b. By turning on the electric heater 13b, the evaporator 5b is defrosted.

In the second prior art example that operates as described above, the temperature of the cooling gas fluctuates when the gas flow path is switched, making it impossible to adjust the temperature with high accuracy. Since it was necessary, both the equipment price and operating cost were high. In view of the above-mentioned drawbacks of the conventional defroster, it is an object of the present invention to provide a defroster for a gas cooler having a high cooling temperature accuracy and a low operating cost.

Further, since the present invention is configured so that the gas passage is partitioned by a plurality of partition plates, it is an object of the present invention to defrost without stopping the operation of the cooling device.

Disclosure of the invention

That is, the present invention relates to a gas cooling device in which a vaporizer of a refrigerant circuit configured by connecting a compressor, a condenser, a decompression mechanism, and an vaporizer is provided in a gas flow path. The body flow path is divided into a large number of branch flow paths, and an opening / closing means for closing and opening each branch flow path is provided, and an evaporator connected after branching the refrigerant circuit into each of the branch flow paths, A means for heating the evaporator and a temperature detector for detecting the temperature of each evaporator are provided, and one branch flow path among the plurality of branch flow paths described above is always opened / closed by the opening / closing means. Is closed, and the evaporator in the closed branch flow passage is defrosted by operating the heating means to complete defrosting. After that, the dividing channel is opened by the opening / closing means.

Therefore, the apparatus of the present invention is provided with a large number of 0-division flow paths, and even if one of the branch flow paths is being defrosted, the evaporators in the other diversion flow paths are controlled so that the cooling operation is performed. Highly accurate temperature control is possible without stopping.

Brief description of the drawings

FIGS. 1 and 2 are explanatory views of the prior art, and FIGS. 3 to 8 show the working lines of the apparatus according to the present invention, and FIGS. 3, 4, and 6 are respectively Front views showing the first, second, and third embodiments, FIG. 5 is a timing chart of the first and second embodiments, and FIG. 7 is a side view showing the branched flow passage of FIG. FIG. 8 is a timing chart showing the function of the defrost controller of the third embodiment.

BEST MODE FOR CARRYING OUT THE INVENTION

In order to explain this investigation in detail, description will be given below with reference to the drawings shown in FIGS. 3 to 8.

In FIG. 3, reference numeral 20 denotes a gas flow passage that is divided into a large number of branch flow passages 21a to 21f by partition plates 22a to 22e in the gas cooling section, and 23 denotes a stepper motor or the like at the center. An opening / closing means is provided which has a rotation driving unit 24 composed of an electric motor and a closing plate 25 at the tip end thereof, and which can be rotated and can close each of the dividing flow passages 21. 26a to 26f are evaporators that are divided into a large number by the flow divider 27 and are provided in the dividing flow passages 21a to 21f via the solenoid valves 28a to 28f, respectively, and each of them is used to detect the degree of refraction. Heaters 29a to 29f and heaters 30a to 30f consisting of electric heaters

After passing through the evaporator, the

It becomes one refrigerant pipe. 32 is the signal sent from the temperature detector

Drive unit 24, solenoid valves 28a to 28f, heating

This is a defrost controller that controls the devices 30a to 30f.

The operating condition is explained by the timing chart shown in Fig. 5.

If exposed, frost will form on the fin surface of the evaporator 26a, for example.

When the surface temperature of the evaporator 26a drops below Ta,

The signal from the frost controller 32 closes the solenoid valve 28a to cool it.

In addition to stopping the cooling, the heater 30a is energized to start defrosting, and a signal is sent to the rotation driving unit 24 of the opening / closing means 23 to close the windshield.

Rotate 25 to a position that covers the branch channel 21a.

Ventilation to the branch channel 21a is blocked by the closing means 25.

Defrosting is performed quickly and the surface temperature of the evaporator 26a

Solenoid valve 28a opens when T reaches the preset Tb.

Power supply to the heater 30a is stopped. Repeat the above process

After returning, the surface temperature fell below the preset Ta.

Defrost the evaporator intermittently.

In Fig. 4, the opening / closing means 40 is provided at the inlet of each branch flow passage 21a to 21f, and 40 is provided in each branch flow passage.

The opening and closing means 41, 42 are solenoids for opening and closing the opening and closing means.

It is a coil and a spring, and other structures are shown in Fig. 3.

Is the same as that shown in.

In FIG. 6, 20 is divided into a large number by partition plates 22a to 22e.

It is a gas passage that is partitioned into branch flow paths 21a to 21f,

AT10 As shown in the side view of FIG. 7, the dividing flow passages 21a to 21f are divided into an inlet side and an outlet side by a partition plate 36 in a direction orthogonal to the partition plates 22a to 22e, and the evaporator is provided on the inlet side. 26a to 26f are provided. 23 has a rotary drive unit 24 composed of an electric motor such as a stepping motor in the central portion and a closing plate 25 at the tip end thereof for rotation and opening / closing capable of closing each of the branch flow passages 21a to 21f. The opening / closing plate 25 is divided into an inlet side and an outlet side, but simultaneously opens and closes.

The evaporators 26a to 26f are branched into a large number by the flow divider 27 and are provided in the branch flow passages 21a to 21f via the check valves 34a to 34f, respectively, and are equipped with temperature detectors 29a to 29f, respectively. After passing through the vaporizers 26a to 26f and the solenoid valves 33a to 33f, the header 31 serves as one refrigerant distribution again.

Reference numeral 37 denotes a hot gas bypass pipe, which passes from the compressor 2 to the header 38, and is connected to each of the vaporizers 26a to 26f provided in each of the above-mentioned distribution channels 21a to 21f, and to each solenoid valve 39a. ˜39f are connected, and after passing through the evaporators 26a to 26f, they are returned to the refrigerant channel via the check valves 35a to 35f and the header 40.

Reference numeral 32 is a defrost controller that controls the rotation drive unit 24 and solenoid valves 39a to 39f and 33a to 33f based on signals sent from the temperature detectors 29a to 29ί.

To describe the operating states of the solenoid valves 39a to 39f and 33a to 33f, all solenoid valves 39a to 39f are turned off, solenoid valves 33a to 33f are turned on, and the temperature detection is performed during normal cooling operation. If a signal indicating that the temperature of the evaporator has dropped is sent from any of the intellectual devices 29a to 29f, the solenoid valve 39 to the corresponding evaporator turns on, hot gas flows in, and the solenoid valve 33 turns off. Hot gas enters the evaporator and causes frost.

If defrosting is performed and the temperature of the evaporator rises above the specified temperature, and the signal is sent from the temperature detector 29 to the defrosting controller 32, the solenoid valve 39 corresponding to that command will be sent. Is turned off, the hot gas is shut off, the refrigerant is supplied to the evaporator through the check valve 34, and the solenoid valve 33 is turned on. If this is done sequentially for evaporators with frost, defrosting is always performed in one evaporator, but the steam generator 26 provided in the other branch passage 21 continues to operate. is there.

Further, in the present paper, the defrosting device having the above-mentioned structure can be used to perform other operations. Rotating intermittently, the closing plate 25 is rotated at a predetermined time, and therefore, one of the multiple branch flow passages 21a to 21f is always connected to the inlet and outlet of one branch flow passage 21. It should be closed.

Then, in this case, the solenoid valve 39 leading to the evaporator 26 in the closed branch flow passage 21 is turned on, the solenoid valve 33 is turned off, and the hot gas bypass pipe 37 is turned on by the timer gas command 37 in accordance with the instruction of the timer. Hot hot gas enters evaporator 26 for defrosting. After defrosting is completed, the temperature sensor 29 will display the temperature of the evaporator 26 concerned. Signal to the Frost Controller 32 that the

Solenoid valve 39 is turned off, solenoid valve 33 is turned on, and the refrigerant is

It enters the evaporator 26 and is cooled. And predetermined

This branch flow path is

The closing plate of the opening / closing means that has closed the

The entrance and exit are closed, and they are moved in sequence. Na

Oh, the specified time to work the opening and closing means by the timer,

Sufficient defrost and time for subsequent cooling

Of course.

Industrial availability

As described above, the device according to the present invention is capable of continuous operation and

It is useful for gas cooling equipment that requires cooling temperature accuracy.

is there.

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Claims

The scope of the claims

(1) In a gas cooling device provided with an evaporator of a refrigerant channel formed by connecting a compression nozzle, a condenser, a decompression mechanism, and an evaporator in the gas channel, Is divided into a large number of branch channels, and an opening / closing means for closing and opening each branch channel is provided, and an evaporator connected to each of the branch channels after branching the refrigerant circuit, and an evaporator. And a temperature detector for detecting the temperature of each vaporizer are provided, and one branch flow path among the aforementioned multiple branch flow paths is always closed by the opening / closing means. The evaporator in the closed branch flow passage is defrosted by operating the heating means so that the branch flow passage is opened by the opening / closing means after the defrosting is completed. The removal of the gas cooling device characterized by

(2) The defroster for a gas cooling device according to claim 1, wherein the opening / closing means is configured to open and close the inlet of each branch passage.

(3) The defroster for a gas cooling device according to claim 1, wherein the opening / closing means is configured to open and close the inlet and outlet of each branch passage.

(4) The defroster for a gas cooling device according to claim 2 or 3, wherein the means for heating the evaporator comprises a heater such as a heater.

E) means for heating the evaporator and the evaporator, And a compressor and a hot gas by-pass pipe that forms a closed circuit via a solenoid valve, the defrosting device for a gas cooling device according to claim 2 or 3.