JPH0447583Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an improvement in a solvent direct cooling device for a washing machine to prevent clouding from occurring in a washing tank of a washing machine.

(Prior art) A cleaning machine is equipped with a solvent that suppresses the temperature rise of the solvent solution in the cleaning tank, re-liquefies the evaporated gas of the solvent, and separates moisture from the solvent condensate produced by the re-liquefaction. Cooling equipment is provided as an essential measure. Conventionally, such cooling devices include direct solvent cooling devices for washing machines that suppress the temperature increase of the solvent liquid, reliquefy the evaporated solvent gas, and separate water from the solvent condensate by circulating cooled Freon as a refrigerant. It is used.

FIG. 2 is a block diagram of a conventional solvent direct cooling device for a washing machine, in which a high-pressure refrigerant liquid L1 generated in a refrigerator 1 is transferred to a low-pressure low-temperature solvent liquid L2 by an expansion valve V2.
It also becomes a low-pressure low-temperature refrigerant liquid L3 by the expansion valve V3. The low-pressure low-temperature refrigerant liquid L2 is turned into a solvent condensate YC by cooling and re-liquefying the solvent evaporated gas YG in the solvent evaporative gas cooler 2, and also becomes a low-pressure low-temperature refrigerant liquid L4. Low pressure low temperature refrigerant liquid L4
is the water separation cooler 4 of the solvent condensate water separator 14
The water in the solvent condensate YC is precipitated by cooling the solvent condensate YC. The low-pressure low-temperature refrigerant liquid L4 becomes refrigerant evaporated gas G through heat exchange in the water separation cooler 4 and returns to the refrigerator 1.

The low-pressure low-temperature refrigerant liquid L3 enters the solvent liquid cooler 3 of the solvent liquid cooling tank 12, cools the solvent liquid by exchanging heat with the solvent liquid, and returns to the refrigerator 1 as a refrigerant evaporated gas G. The above-mentioned adjustment of the expansion valves V2 and V3 in the refrigerant circulation path is performed based on the temperature of the refrigerant evaporated gas G. The solvent solution for cleaning the object to be cleaned 10 in the cleaning tank 11 overflows and enters the steam tank 13, where it is heated and evaporated to become solvent evaporation gas YG. The solvent evaporation gas
YG is reliquefied by exchanging heat with the low-pressure low-temperature refrigerant liquid L2 by the above-mentioned solvent evaporative gas cooler 2, and is collected in the solvent condensate water separator 14 as a solvent condensate YC. The solvent condensate YC is converted into a low-pressure low-temperature refrigerant liquid L by the water separation cooler 4 described above.
By exchanging heat with 4, moisture is precipitated and separated, and returned to the solvent liquid cooling tank 12 as returned solvent liquid YR. The solvent liquid cooling tank 12 is a returning solvent liquid.
Overflow solvent solution by overflowing the solvent which increases by accepting YR
It is sent to the cleaning tank 11 as YF. Since the overflow solvent liquid YF is cooled by heat exchange with the low-pressure low-temperature refrigerant liquid L3 by the above-mentioned solvent liquid cooler 3, the temperature increase of the solvent liquid in the cleaning tank 11 is suppressed.

(Problems to be solved by the invention) In the conventional solvent direct cooling device for washing machines described above, when a high boiling point solvent is used, it is necessary to increase the cooling capacity. The temperature of the refrigerant liquid flowing into the cooler 4 drops to about 5°C. On the other hand, a solvent with a high boiling point, such as trichlorethylene, can dissolve about 0.04% water at 30°C, but only about 0.014% at 5°C.

Therefore, when the solvent condensate YC at 30°C is lowered to 5°C by heat exchange with the water separation cooler 4, approximately 0.026% water will precipitate, but the entire amount of this precipitated water will be absorbed into the solvent condensate. Since it is difficult to separate with the capacity of the water separator 14, the remaining moisture mixes with the solvent condensate in the solvent condensate water separator 14, making the solvent condensate cloudy. This cloudiness is carried into the solvent liquid cooling tank 12 by the returned solvent liquid YR.

Furthermore, when the above-mentioned phenomenon occurs in the solvent condensate water separator 14 in the solvent liquid cooling tank 12, approximately
The precipitated water of 0.026% mixes with the solvent solution, causing the solvent solution to become cloudy. The cloudiness that occurs in the above two places is
The above-mentioned water, which is brought into the cleaning tank 11 by the overflow solvent liquid YF and which makes the state of the object 10 being cleaned invisible and forms cloudiness, generates fine particle marks on the surface of the object 10 to be cleaned. This causes the problem that the desired clean surface cannot be obtained.

The purpose of this invention is to measure the temperature of solvent evaporation gas that is easily captured during solvent circulation, and to adjust the cooling capacity based on the measured value. Anti-clouding solvent direct cooling device for washing machines that suppresses water analysis from the solvent and prevents clouding in the solvent by minimizing the temperature difference between the The goal is to provide the following.

(Means for solving the problems) The present invention has the following means configuration to achieve the above object. That is, the clouding prevention type solvent direct cooling device for a washing machine of the present invention is a direct cooling device for cooling a solvent for a washing machine, and includes a solvent evaporation gas temperature sensor for measuring the temperature of the solvent evaporation gas; a refrigerant evaporated gas temperature sensor for measuring the temperature of the solvent; upon receiving the temperature data from the two temperature sensors, when the washer starts operating, the main power supply is turned off until the solvent evaporated gas temperature reaches a preset temperature; For cooling systems with on-off control, the main power is turned off, and for cooling systems with expansion valve control, the opening degree of the expansion valve is set to suppress the cooling capacity, and the temperature of the solvent evaporated gas is After reaching the preset temperature, the cooling system will operate normally, but if the difference between the temperature of the solvent evaporated gas and the temperature of the refrigerant evaporated gas exceeds a predetermined value based on the water analysis output amount, the main power will be turned off. In the case of an on-off control cooling device, the main power is turned off, and in the case of an expansion valve control cooling device, the opening degree of the expansion valve is set to suppress the cooling capacity, and the temperature difference is set to the predetermined value. A washing machine characterized by comprising: a cooling capacity control unit that controls to turn on the main power or set the opening degree of the expansion valve so that the normal cooling capacity is exhibited when the following conditions are reached: This is a direct cooling device for solvents that prevents clouding.

(Function) Hereinafter, the function of the clouding prevention type solvent direct cooling device for a washing machine having the above-mentioned means configuration will be explained.

The clouding prevention type solvent direct cooling device for washing machines of the present invention has a solvent evaporative gas temperature sensor that measures the temperature of the evaporative gas of the solvent, and the measured value is sent to the cooling capacity control unit that adjusts the cooling capacity. Ru.

The cooling capacity can be controlled by controlling the temperature of the low-temperature refrigerant liquid by turning off or disconnecting the main power supply of the cooling system, and by adjusting the opening degree of the expansion valve that generates the low-temperature refrigerant liquid in the operating cooling system. and the flow rate may be determined.

In the former case, the cooling device is not operated at the same time as the washer starts operating, but the cooling capacity control unit operates the cooling device when the measured value of the solvent evaporative gas temperature sensor reaches a predetermined value. Circulate the refrigerant.

Therefore, the water separation cooler of the solvent condensate water separator and the solvent liquid cooler of the solvent liquid cooling tank gradually become low temperature after the temperature of the solvent is raised, and the temperature difference between the solvent and refrigerant is large and the temperature difference between the solvent and the refrigerant is large. Since no significant cooling is performed, precipitation of moisture from the solvent can be suppressed.

In addition, after the cooling device starts operating, the cooling capacity control unit grasps the value of the refrigerant evaporative gas temperature measured for the cooling device operation together with the measured value of the solvent evaporative gas temperature sensor, and When the difference in values exceeds a predetermined value, the cooling device is stopped, and when the difference falls below a predetermined value, the cooling device is activated. Therefore, the temperature difference between the solvent and the refrigerant in the solvent condensate water separator and the solvent liquid cooling tank can be reduced within a range that does not impede cooling of the solvent, and precipitation of moisture from the solvent can be suppressed.

In the latter case, the cooling capacity control unit adjusts the opening degree of the expansion valve described above, but when the washer starts operating, the cooling capacity is suppressed until the measured value of the solvent evaporation gas temperature sensor reaches a predetermined value. The opening degree of the expansion valve is set so that After the cooling device exhibits its normal cooling capacity, an expansion valve is installed to suppress the cooling capacity when the difference between the measured value of the refrigerant evaporative gas temperature and the measured value of the solvent evaporative gas temperature sensor exceeds a predetermined value. The opening degree of the expansion valve is set so that the normal cooling capacity is exhibited when the opening degree becomes below a predetermined value. Therefore, since the solvent is not rapidly cooled when the washing machine starts operating, and the solvent is not cooled while the temperature difference between the solvent and the refrigerant remains large, precipitation of moisture from the solvent can be suppressed.

As explained above, in the anti-clouding solvent direct cooling device for washing machines of the present invention, the cooling capacity control section operates/stops the cooling device or generates a low-temperature refrigerant liquid based on the measured value of the solvent evaporation gas temperature sensor. By commanding the opening degree of the expansion valve, the cooling capacity is adjusted so that an excessive temperature difference does not occur between the solvent and the refrigerant, which suppresses the separation of water in the solvent and prevents cleaning due to the precipitation of water. Can prevent cloudiness in the tank.

(Example) Hereinafter, an example of the anti-clouding solvent direct cooling device for a washing machine according to the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of a clouding prevention type solvent direct cooling device for a washing machine according to an embodiment of the present invention, and a in the figure is a
This is an example of a configuration in which the cooling capacity control section adjusts the cooling capacity of the cooling device by instructing the operation/stop of the refrigerator that constitutes the cooling device. This is a configuration example in which the cooling capacity of the cooling device is adjusted by commanding the opening degree setting of the expansion valve.

In a above, the high-pressure refrigerant liquid L1 generated by the refrigerator 1 becomes the low-pressure low-temperature refrigerant liquid L2 by the expansion valve V2 and flows into the solvent evaporative gas cooler 2, and the expansion valve V3
As a result, it becomes a low-pressure low-temperature refrigerant liquid L3 and flows into the solvent liquid cooler 3. The low-pressure low-temperature refrigerant liquid L4 flowing out from the solvent evaporative gas cooler 2 is transferred to the solvent evaporative gas cooler 2.
The water separation cooler 4 of the solvent condensate water separator 14 that separates water in the solvent condensate re-liquefied by
The refrigerant becomes evaporated gas G. The refrigerant evaporated gas G is converted into a low-pressure low-temperature refrigerant liquid L in the solvent liquid cooler 3.
3 is combined with the transformed refrigerant evaporated gas G to form refrigerator 1.
Return to The measured value of the solvent evaporative gas temperature sensor 2T is entered into the switch control panel 1CS installed in the refrigerator 1, and when the above measurement value reaches a predetermined value, the switch control panel 1CS is sent to start operation of the washing machine. is switch 1
By instructing S to close, the main power source 1P of the refrigerator is connected to the refrigerator 1, and the refrigerator 1 is operated.

Furthermore, after the refrigerator 1 starts operating, the switch control panel 1CS grasps the measured value of the refrigerant evaporative gas temperature together with the measured value of the solvent evaporative gas temperature sensor 2T,
When the difference between the above two measured values exceeds a predetermined value, the refrigerator main power supply 1P is commanded to open the switch 1S.
is disconnected from the refrigerator 1 to stop the refrigerator 1. When the difference between the two measured values becomes equal to or less than a predetermined value, the main power source 1P of the refrigerator is connected to the refrigerator 1 to operate the refrigerator 1 by instructing the switch 1S to close.

In Fig. 1b, the solvent evaporated gas temperature sensor 2T
The expansion valve control board 1CV takes in the measured value of , and the expansion valve control board 1CV controls the opening of the expansion valve V2 based on the above measured value and the difference between the above measured value and the measured value of the refrigerant evaporated gas temperature. A command for setting the opening degree is sent to the expansion valve opening degree setting motor 1M.

The expansion valve opening setting motor 1M rotates the expansion valve opening setting shaft 1R in response to the above command, and sets the opening of the expansion valve V2 to a value commanded by the expansion valve control panel 1CV. The set value of the expansion valve opening commanded by the expansion valve control panel 1CV when the washer starts operation is a low-pressure, low-temperature setting that only has a suppressed cooling capacity until the measured value of the solvent evaporation gas temperature sensor reaches a predetermined value. This is the opening degree value that generates the refrigerant liquid L2, and is the opening degree value that generates the low-pressure low-temperature refrigerant liquid L2 that exhibits normal performance when the above measured value reaches a predetermined value.

In addition, after the cooling system has achieved its normal cooling capacity, the expansion valve opening setting commanded by the expansion valve control panel 1CV is determined by the difference between the measured value of the solvent evaporative gas temperature sensor and the measured value of the refrigerant evaporative gas temperature. When it exceeds a predetermined value, it is an opening value that produces a low-pressure low-temperature refrigerant liquid L2 that does not have the suppressed cooling ability, and when the above difference is less than a predetermined value, it is a low-pressure low-temperature refrigerant that exhibits a normal cooling ability. This is the opening degree value that generates the liquid L2.

(Effects of the invention) As explained above, in the anti-clouding solvent direct cooling device for washing machines of the present invention, the cooling capacity control section controls whether the cooling device starts or stops or changes to low temperature based on the measured value of the solvent evaporation gas temperature sensor. By commanding the opening degree adjustment of the expansion valve that generates the refrigerant liquid, the cooling capacity is adjusted so that an excessive temperature difference does not occur between the solvent and the refrigerant. Therefore, the washing machine equipped with the clouding prevention type solvent direct cooling device for washing machines of the present invention, which suppresses the water analysis and precipitation in the solvent and prevents clouding in the washing tank due to the precipitation of water, does not require high boiling point solvents. When using it, you can clearly see the condition of the object being cleaned, and
This method has the advantage that it is easy to obtain the desired clean surface because traces of moisture particles can be almost completely eliminated from the surface of the object to be cleaned.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an anti-clouding type solvent direct cooling device for a washing machine according to an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional solvent direct cooling device for a washing machine. 1... Refrigerator, 1CS... Switch control panel, 1CV
...Expansion valve control panel, 1M...Expansion valve opening setting motor, 1P...Freezer main power supply, 1R...Expansion valve opening setting axis, 1S...Switch switch, 2...Solvent evaporative gas cooler , 2T...Solvent evaporation gas temperature sensor, 3...
...Solvent liquid cooler, 4...Water separation cooler, 10...
...Object to be cleaned, 11...Cleaning tank, 12...Solvent liquid cooling tank, 13...Steam tank, 14...Solvent condensate water separator, G...Refrigerant evaporation gas, L1...High pressure refrigerant liquid, L2 , L3, L4...Low pressure low temperature refrigerant liquid, V
2, V3...Expansion valve, YC...Solvent condensate, YF...
...Overflow solvent liquid, YG...Solvent evaporation gas,
YR... Return solvent liquid.

Claims (1)

[Scope of utility model registration request] In a direct cooling device for cooling a solvent for a washing machine, a solvent evaporative gas temperature sensor for measuring the temperature of the solvent evaporative gas; a refrigerant evaporative gas temperature sensor for measuring the temperature of the refrigerant evaporative gas; Upon receiving the temperature data from the temperature sensor, when the washer starts operating, the main power is turned off in the case of a cooling device with main power on/off control until the solvent evaporated gas temperature reaches a preset temperature. In the case of an expansion valve-controlled cooling system, the opening degree of the expansion valve is set to suppress the cooling capacity, and the cooling system is operated normally after the solvent evaporated gas temperature reaches a preset temperature. However, if the difference between the temperature of the solvent evaporation gas and the temperature of the refrigerant evaporation gas exceeds a predetermined value based on the amount of water analyzed, the main power is turned off in the case of a cooling system with main power on/off control, and the expansion is stopped. In the case of a valve-controlled cooling device, the opening degree of the expansion valve is set to suppress the cooling capacity, and when the temperature difference becomes less than the predetermined value,
A cooling capacity control unit that controls turning on the main power supply or setting the opening degree of an expansion valve so as to exhibit normal cooling capacity; Cooling system.