KR20010075995A - Apparatus for circulating constant temperature fluid - Google Patents

Abstract

PURPOSE: Provided is a thermostatic circulatory water tank which can maintain water temperature constant, decrease power consumption considerably and extend the expected life span of a freezing system by decreasing its load placed on a compressor. CONSTITUTION: A thermostatic circulatory water tank is composed of the followings: (a) a thermostatic tank containing water; (b) a heater for increasing water temperature in the thermostatic tank; (c) a freezing system including a cooling evaporation pipe which is installed within the thermostatic tank and lowers water temperature according to the evaporation of liquid coolant, a compressor compressing coolant via the cooling evaporation pipe and a condenser for excluding heat of the coolant out; (d) a circulatory pump for circulating the water contained in the thermostatic tank out.

Description

Apparatus for circulating constant temperature fluid

The present invention relates to a constant temperature water tank, and more particularly, to a constant temperature water tank capable of extending the life by reducing the load applied to the compressor and enabling temperature control in a wider area.

The constant temperature circulation tank is widely used for the purpose of maintaining a specific temperature in a laboratory.

1 is a configuration diagram of a conventional constant temperature circulating water tank, Figure 2 is a graph showing the load of the compressor for each temperature in the constant temperature circulating water tank of FIG. As shown, the constant temperature circulating water tank includes an insulated thermostat 1, a heater 2 for raising the water temperature, a refrigeration system for lowering the water temperature, a sensor 3 for measuring the water temperature, and a thermostat. It includes a circulation pump (4) for circulating the water contained in (1) to the outside. The circulation pump 4 has a circulation fan 4a submerged in water, and water is circulated through the pipes 4b and 4c connected to an external experimental device (not shown) as the circulation fan 4a is rotated. do. The thermostat 1 is used to cool high temperature water at room temperature, and is provided with a cooling tube 6 through which cooling water is circulated and a valve 7 for selectively blocking the inflow and outflow of cooling water into the cooling tube 6. . The heater 2, the sensor 3, and the circulation pump 4 as described above are controlled by the controller 5.

The refrigeration system, the endothermic evaporation tube 10 which absorbs the surrounding heat by gasifying the liquid refrigerant submerged in the liquid state, and the high-temperature low-pressure refrigerant gas via the endothermic evaporation tube (10) high pressure gas And a condenser 12 for discharging the heat of the refrigerant to outside air as the heat of condensation while changing the high pressure and high temperature refrigerant gas into a high pressure liquid. In addition, a capillary tube 14 or an expansion valve is provided between the condenser 12 and the cooling evaporation pipe 10 to lower the pressure so that the high pressure refrigerant liquid flowing into the cooling evaporation pipe 10 is easily evaporated. In addition, a cooling motor 13 having a cooling fan forcibly circulating air is provided at the rear of the condenser 12 to promote cooling of the condenser 12.

In the constant temperature circulation tank of this structure, the refrigeration system and the heater 2 must be operated simultaneously in order to keep the water temperature constant. This is because the temperature control is not easy due to the characteristics of the refrigeration system, the water temperature can be kept constant only if the refrigeration system is continuously operated to give an amount of heat to compensate for this while maintaining an endothermic state. On the other hand, when the water temperature dropped rapidly from high temperature to room temperature, the cooling water such as tap water was forcibly returned to the cooling tube 6 to lower the water temperature.

However, as the temperature increases, the refrigerant gas increases in proportion to volume, heat content, and endothermic amount. Therefore, when the ambient temperature is a high temperature, when the liquid refrigerant evaporates in the cooling evaporation pipe 10, the volume and heat content of the evaporated refrigerant gas is large, so that the refrigerant gas of high temperature and low pressure flows into the compressor 11, In the process of making the low-pressure refrigerant gas to a high pressure, the temperature of the refrigerant rises excessively and acts as an overload to the compressor (11). Therefore, the life of the compressor 11 is shortened and the amount of power consumed is increased.

In addition, since the endotherm of the heat in the cooling evaporation tube 10 is excessively absorbed, the ambient water temperature dropped sharply, and in order to compensate for the endothermic amount, a large amount of electric power must be supplied to the heater 2, and to cool the high temperature refrigerant The condenser 10 has to be released a lot of heat, so the temperature of the laboratory has increased a lot.

In addition, in the low temperature region C, since the volume and the heat content of the refrigerant gas evaporated in the cooling evaporation tube 10 are small, it is difficult to cool the self-heating of the compressor 11, and the suction is small compared to the capacity of the compressor 11. Since it shows calories, rapid cooling is not achieved. In this state, a light load is applied to the compressor.

In addition, the region in which the load applied to the compressor is appropriate is a middle temperature region, and the width of the actual middle temperature region has a problem that the range of appropriate control can be narrowed because the electrical load of the compressor and the temperature of the compressor must be kept under appropriate conditions.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a constant temperature circulating water tank capable of reducing the load applied to the compressor to increase the service life and controlling the temperature in a wider area.

1 is a configuration diagram of a conventional constant temperature circulation tank,

Figure 2 is a graph showing the load of the compressor for each temperature in the constant temperature circulation tank of Figure 1,

3 is a configuration diagram of a first embodiment of a constant temperature circulation tank according to the present invention,

4 is a cross-sectional view of the tubular nozzle employed in FIG.

5 is a graph showing the load of the compressor for each temperature in the constant temperature purified water tank of FIG.

Figure 6 is a block diagram of a second embodiment of the constant temperature circulation tank according to the present invention.

<Explanation of symbols for the main parts of the drawings>

21 ... Thermostat 22 ... Heater

23 ... sensor 24 ... circulation motor

24a ... circulation fan 25 ... control unit

30 ... Cooling evaporator 31 ... Compressor

32 ... condenser 33 ... cooling motor

34 ... Siri R1 ... inlet pipe

R2 ... outlet pipe

35, 37, 39, 41, 42 ... 1, 2, 3, 4, 5 pipe nozzle

36, 38, 40, 43 ... 1, 2, 3, 4 solenoid valve

44 ... auxiliary cooling pipe 45 ... valve

46, 48, 50, 52 ... 1, 2, 3, 4 Diaphragm Type Needle Valve

In order to achieve the above object, the constant temperature circulating water tank according to the present invention, the constant temperature bath 21 is water; A heater 22 for raising the water temperature of the thermostat 21; A cooling evaporation pipe (30) installed inside the thermostat (21) to lower the water temperature as the liquid refrigerant evaporates, a compressor (31) for compressing the refrigerant via the cooling evaporation pipe (30), and the compressor A refrigeration system having a condenser 32 for dissipating heat of the refrigerant via 31 to the outside; In the constant temperature circulating water tank including a circulation pump 45 for circulating the water contained in the thermostat 21, the refrigeration system, the refrigerant flowing out of the condenser 32 directly to the compressor (31) And a bypass valve for guiding and at least one refrigerant flow amount adjusting means connected between the cooling evaporation pipe 30 and the condenser 32 to adjust the flow rate of the refrigerant.

Here, the refrigerant flow amount adjusting means is composed of a tubular nozzle (35) 37 and a solenoid valve (36) (38) connected in series with the tubular nozzle, or a diaphragm provided with a stepping motor Type needle valves 46 and 48.

In addition, the cooling evaporation pipe 30 further comprises a refrigerant evaporation pressure adjusting means connected between the compressor and the compressor 31 to adjust the evaporation pressure of the refrigerant. At this time, the refrigerant evaporation pressure adjusting means, the pipe nozzle (39) for inducing high-pressure evaporation of the refrigerant, and the pipe nozzle (41) and the solenoid valve (40) connected in series in parallel with the pipe nozzle. It is a diaphragm type needle valve 50 configured or provided with a stepping motor.

In addition, the bypass valve is a diaphragm needle valve 52 composed of a tubular nozzle 42 for allowing a constant flow of refrigerant, and a solenoid valve 43 connected in series with the tubular nozzle, or provided with a stepping motor. .

Hereinafter, a preferred embodiment of the constant temperature circulation tank according to the present invention.

3 is a configuration diagram of a first embodiment of a constant temperature circulating water tank according to the present invention, FIG. 4 is a cross-sectional view of the tubular nozzle employed in FIG. 3, and FIG. 5 shows a load of a compressor for each temperature in the constant temperature circulating water tank of FIG. One graph. As shown, the constant temperature circulating water tank includes a constant temperature tank 21 in which water is accommodated, a heater 22 for increasing the water temperature of the constant temperature tank 21, a refrigerating system for lowering the temperature of the constant temperature tank, and a lowering of the water temperature. It consists of a cooling means for making, a sensor 23 for measuring the water temperature, and a circulation motor 24 for circulating the water of the thermostat 21 to the outside. These components are controlled by the controller 25.

The thermostat 21 is insulated and there is no heat exchange with the outside.

The circulation motor 24 is for forcibly circulating water, which maintains a constant water temperature, by the heater 22 and the cooling system or the cooling means to an external experimental equipment (not shown). The circulation motor 24 has a circulation fan 24a submerged in water, and water is circulated through the pipes 24b and 24c connected to an external experimental device as the circulation fan 24a is rotated.

The sensor 23 generates a signal corresponding to the measured temperature, and when the signal is transmitted to the controller 25, the controller 25 controls the heater 22, the refrigerating system and the cooling means based on the signal.

The refrigeration system is installed in the thermostat 21 while being connected to the compressor 31 and the condenser 32 installed between the inlet pipe R1 and the outlet pipe R2 and the inlet pipe R1 and the outlet pipe R2. And it has a cooling evaporation pipe 30 to lower the water temperature of the water as the liquid refrigerant evaporates. The compressor 31 compresses the incoming high temperature low pressure refrigerant gas into a high pressure gas, and the condenser 32 discharges the heat of the refrigerant to the outside air as the heat of condensation while changing the high pressure high temperature refrigerant gas into a high pressure liquid. The high pressure liquid refrigerant via the condenser 32 flows into the cooling evaporation pipe 30 through the inflow pipe R1.

At this time, a cooling motor 33 having a cooling fan is installed at the rear of the condenser 32 to circulate air to the condenser 32, and the condenser 32 has a sire 34 for concentrating the flow of air. Is installed.

In the inlet pipe R1 between the cooling evaporation pipe 30 and the condenser 32, two refrigerant flow amount adjusting means for adjusting the flow amount of the refrigerant passing therethrough are provided in parallel. The refrigerant flow amount adjusting means includes first and second pipe nozzles 35 and 37 and a first and second solenoid valve 36 connected in series with each of the first and second pipe nozzles 35 and 37 to constantly flow the refrigerant. 38). The first and second pipe nozzles 35 and 37 may have different diameters, so that the amount of refrigerant flowing may be different.

In the outlet pipe R2 between the cooling evaporation pipe 30 and the compressor 31, the evaporation pressure of the refrigerant is controlled to adjust the evaporation pressure of the liquid refrigerant and thus the evaporation temperature of the refrigerant in the cooling evaporation pipe 30. Means are installed. The refrigerant evaporation pressure adjusting means includes a third pipe nozzle (39) for inducing high-pressure evaporation of the refrigerant, a fourth pipe nozzle (41) connected in series in parallel with the third pipe nozzle (39) and It consists of a fourth solenoid valve 40.

And between the inlet pipe (R1) and the outlet pipe (R2), the refrigerant flowing out of the condenser 32 and the high-temperature refrigerant gas via the cooling evaporation pipe 30 is mixed to guide the compressor (31) A valve is installed, and the bypass valve includes a fifth pipe nozzle 42 and a fifth solenoid valve 43 connected in series.

The first, second, third, fourth and fifth pipe nozzles mentioned above have the same structure, and the first pipe nozzle 35 is illustrated in FIG. 5. As shown, the first tube nozzle 35 has a structure in which a through hole 35b is formed in the tube body 35a. The resistance of the refrigerant passing through the tubular nozzle 35 depends on the inner diameter D and the length L. Therefore, the size of the pipe nozzle 35 is appropriately set in accordance with the capacity and use of the air conditioning system. In the present embodiment, the tubular nozzle is about 0.3 mm to 2 mm in inner diameter d, and the length L is 0.5 mm to 30 mm. However, not only the above-described tube nozzle but also a capillary tube can also achieve the same effect as the present invention.

Since the first, second, fourth and fifth solenoid valves 36, 38, 40 and 43 all have the same structure and are generally used, detailed description thereof will be omitted.

The bypass valve prevents excessive overload of the compressor. That is, when the high temperature refrigerant gas via the cooling evaporation pipe 30 directly flows into the compressor 31, the compressor 31 may be damaged due to an overload in the process of compressing the high temperature refrigerant gas. Therefore, it is necessary to lower the temperature of the refrigerant gas flowing into the compressor 31, and for this purpose, the refrigerant gas cooled by the condenser 32 is a high temperature refrigerant via the cooling evaporation pipe 30 in the outlet pipe R2. Proper mixing with the gas lowers the temperature so that the compressor 31 is introduced. Therefore, overload due to high temperature can be prevented, thereby preventing damage to the compressor 31.

The cooling means is used to cool the high temperature water temperature to room temperature, and the auxiliary cooling pipe 44 through which the cooling water is circulated and the valve 45 for selectively blocking the inflow and outflow of the cooling water into the auxiliary cooling pipe 44. Have Such a valve 45 is preferably a solenoid valve operated by the control unit 25.

Next, the operation of the constant temperature circulation tank of such a structure will be described with reference to FIG.

1) When the water temperature is constant in the high temperature range-follow the α line

In order to maintain the water temperature at a high temperature, the cooling evaporation pipe 30 has a small amount of heat absorption and the heater 22 has to heat a small amount. However, when the refrigerant evaporates at a high temperature in the cooling evaporation pipe 30, the volume and heat content of the refrigerant gas increases, thereby excessively absorbing the surrounding heat, thereby excessively increasing the temperature of the refrigerant gas. When the refrigerant gas having an excessive temperature flows into the compressor 31, an overload is applied to shorten the life of the compressor 31. In addition, since the cooling evaporation pipe 30 excessively absorbs the surrounding heat due to the large heat content, the water temperature is drastically lowered, and power consumption is required because a large amount of power must be supplied to the heater 22 to compensate for the drop in the water temperature. Will increase.

Therefore, it is necessary to reduce the endothermic amount of the cooling evaporation pipe 30 to prevent a sudden drop in the water temperature. To do this, one of the first solenoid valve 36 and the second solenoid valve 38 is closed to reduce the amount of refrigerant flowing into the cooling evaporation pipe 30, and the third solenoid valve 40 is closed to close the evaporation pressure of the refrigerant. By increasing the high temperature evaporation is induced. Then, the endothermic slope according to the temperature is in the state along the α line of the graph shown in Fig. 5, the cooling evaporation tube 30 absorbs only a relatively small amount of heat around, so only the light load is applied to the compressor 31. do.

In addition, by absorbing only a small amount of ambient heat, it is possible to reduce the amount of power applied to the heater 22 to prevent a sudden drop in the water temperature and compensate for this. At this time, as the refrigerant flows little by little through the third pipe nozzle 39, it is possible to prevent a sudden drop in temperature, and by adjusting the third solenoid valve 40, induces stepwise evaporation of the liquid refrigerant and thus cooling evaporation. The distribution of temperature and endothermic amount was improved throughout the tube.

2) When the water temperature is constant in the middle temperature range-follow the β, γ line

At this time, one of the first solenoid valve 36 or the second solenoid valve 38 is opened, and the third solenoid valve 40 is opened. Then, since the third solenoid valve 40 is opened while the amount of refrigerant flowing into the cooling evaporation pipe 30 is reduced, natural evaporation is induced. Then, the endothermic slope according to the temperature is in a state along the β or γ line of the graph shown in Fig. 5, the cooling evaporation pipe 30 absorbs the heat of the surroundings appropriately, so that the compressor 31 has only a suitable load or a light load. This is applied to prevent overload.

At this time, the load of the compressor 31 is adjusted by adjusting the flow of the refrigerant flowing into the cooling evaporation pipe 30 due to the adoption of two refrigerant flow rate adjusting means (first and second pipe valves and first and second solenoid valves). As a result, the middle temperature range is wider than that of the conventional constant temperature circulation tank.

3) When the water temperature is constant in the low temperature region-follow the θ line

At this time, all of the first, second and third solenoid valves 36, 38 and 40 are opened. Then, the amount of refrigerant flowing into the cooling evaporation pipe 30 becomes the maximum and the low temperature evaporation is achieved by opening the third solenoid valve 40. Then, the endothermic amount gradient according to the temperature is in a state along the θ line of the graph shown in FIG. 5, and the endothermic capacity of the cooling evaporation pipe 30 is increased. Therefore, although there is a difficulty in cooling the non-quickness of cooling caused by the small endothermic amount in the constant temperature circulating water tank or the heat generated by the compressor 31 itself, in the present invention, the cooling evaporation pipe 30 maintains sufficient endothermic capacity even at low temperatures. While cooling can be performed quickly, the heat generated by the compressor 30 can be cooled sufficiently.

4) When controlling temperature rapidly from high temperature to room temperature,

When the water temperature drops sharply from high temperature to room temperature, the cooling water such as tap water is forcibly returned to the auxiliary cooling pipe 44 to lower the water temperature, and then, the refrigeration system is operated to control the temperature.

On the other hand, the bypass valve is suitable for mixing the refrigerant gas of the high temperature via the cooling evaporation pipe 30 and the refrigerant gas cooled in the condenser 32 to lower the temperature to flow into the compressor 31 to prevent damage of the compressor 31. prevent.

Figure 6 is a block diagram of a second embodiment of the constant temperature circulating water tank according to the present invention. Here, the same reference numerals as in Fig. 4 indicate the same members having the same function.

The difference from the first embodiment is that the refrigerant flow amount adjusting means, the refrigerant evaporation pressure adjusting means, and the bypass valve are diaphragm type needle valves 46, 48, 50 and 52 provided with a stepping motor. Since the diaphragm type needle valve is a very general valve for regulating the flow of refrigerant by an applied power source, a detailed description thereof is omitted, and the constant temperature circulating water tank employing the air conditioning system having such a structure has the same operation as that described in the first embodiment. Since the description is similar, the detailed description is omitted.

Although the present invention has been described with reference to one embodiment shown in the drawings, this is merely illustrative, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. .

As described above, the constant temperature circulating water tank according to the present invention maintains the water temperature at a high temperature as well as at a low temperature while greatly reducing power consumption by employing a refrigerant flow rate adjusting means, a refrigerant evaporation pressure means, a bypass valve and a cooling means. In addition to reducing, the load applied to the compressor can be reduced to extend the life of the refrigeration system.

Claims (8)

A thermostat 21 in which water is accommodated; A heater 22 for raising the water temperature of the thermostat 21; A cooling evaporation tube (30) installed inside the thermostat (21) to lower the water temperature as the liquid refrigerant evaporates, a compressor (31) for compressing the refrigerant via the cooling evaporation tube (30), and the compressor A refrigeration system having a condenser 32 for dissipating heat of the refrigerant via 31 to the outside; In the constant temperature circulating water tank comprising a; circulation pump 45 for circulating the water contained in the thermostat 21 to the outside, The refrigeration system, the bypass valve for guiding the refrigerant flowing out of the condenser 32 directly to the compressor 31; Constant temperature circulating water tank characterized in that it comprises at least one refrigerant flow rate control means connected in parallel as being connected between the cooling evaporation pipe (30) and the condenser (32) to control the flow rate of the refrigerant. According to claim 1, wherein the refrigerant flow rate adjusting means, A constant temperature circulating water tank comprising a tubular nozzle (35) (37) for constant flow of refrigerant, and a solenoid valve (36) (38) connected in series with the tubular nozzle. The method of claim 2, The refrigerant flow rate adjusting means is a constant temperature circulating water tank, characterized in that the diaphragm needle valve (46) (48) provided with a stepping motor. The constant temperature circulating water tank according to claim 1, further comprising a refrigerant evaporation pressure adjusting means connected between the cooling evaporation pipe (30) and the compressor (31) to adjust the evaporation pressure of the refrigerant. The method of claim 4, wherein the refrigerant evaporation pressure adjusting means, Pipe nozzle (39) for inducing high-pressure evaporation of the refrigerant, a constant temperature circulating water tank comprising a pipe nozzle (41) and a solenoid valve (40) connected in series in parallel with the pipe nozzle. The method of claim 5, The refrigerant evaporation pressure adjusting means is a constant temperature circulation tank, characterized in that the diaphragm type needle valve (50) is provided with a stepping motor. The method of claim 1, The bypass valve is a constant temperature circulation tank, characterized in that consisting of a tubular nozzle (42) for constantly flowing the refrigerant, and a solenoid valve (43) connected in series with the tubular nozzle. The method of claim 1, The bypass valve is a constant temperature circulating water tank, characterized in that the diaphragm type needle valve 52 is installed with a stepping motor.