JPS61141019A - Liquid temperature controller - Google Patents

Abstract

PURPOSE:To attain the quick and optional control of the liquid temperature by performing the switch control with the supply control of the liquid so that the liquid pass through both large and small tanks or only the small tank. CONSTITUTION:A liquid temperature controller 100 is connected to a heat exchanger 200 set in an artificial heart/lung circuit via a liquid feed pipe 133 and a liquid absorbing pipe 134. a controller 101 contains a liquid feed temperature setting part 101a and a cooling water tank temperature setting part 101b together with a liquid feed pump 102, a water tank 110 for heating means, water tank 120 for cooling means, solenoid valves 131-132, etc. The tank 120 always stores a prescribed amount of liquid, and the excessive liquid flows into the tank 110 over a barrier. Then the liquid is supplied to the tank 110 in a control mode for rise of the liquid temperature and then to the tank 120 in a control mode for fall of the liquid temperature by means of solenoids 131 and 132 respectively. Thus the temperature of the liquid supplied to the controller 101 is always kept at a prescribed level.

Description

DETAILED DESCRIPTION OF THE INVENTION ■Background of the Invention (1) Technical Field The present invention relates to a liquid temperature control device for controlling the temperature of a liquid serving as a heat medium.

(2) Prior art and its problems Conventionally, 1. The mainstream of 8-medium liquid control devices whose purpose is to indirectly control blood temperature by supplying liquid at an arbitrary temperature to a heat exchanger in an artificial heart-lung circuit. has two types of tanks: a cold water tank with a built-in water cooling or refrigerator, and a hot water tank with a built-in heater.
Cooling or heating is performed by switching the connection of the water supply circuit, but since the cold water tank does not have the ability to raise the temperature and the hot water tank does not have the ability to lower the temperature, errors may occur due to incorrect temperature settings, re-cooling, or re-cooling. The problem is that when the cold water temperature is lower than necessary, such as during heating after cooling, or when the hot water temperature is high, it is not possible to increase the cold water temperature or lower the hot water temperature. In addition, one tank has a cooler,
Some devices have a built-in heater and can freely raise or lower the temperature at any desired temperature, but they have the disadvantage that it takes time to switch from cooling to heating and from heating to cooling. Ta.

■0 Purpose of the Invention The present invention was made to solve the problems of the prior art described above.
Another object of the present invention is to provide a liquid temperature control device that can repeatedly raise and lower the temperature.

A liquid temperature control device of the present invention that achieves the above object includes a cooling means having a water tank for cooling the liquid.

A heating means having a water tank for heating a liquid, and a liquid supply control means for selectively supplying the liquid to the cooling means and the heating means, wherein the water tank of the cooling means and the water tank of the An8 means have a liquid storage capacity of one of them and the other. The small paddle is equipped with a liquid sending means for sending out the liquid, and the small paddle is connected so that the liquid can flow only from one tank with a large storage capacity to the other tank with a small storage capacity. ,
The liquid supply control means supplies force to the water tank of the heating means when controlling the temperature rise of the liquid so that the temperature of the liquid sent out from the small tank of the front handle is at a predetermined temperature, and when controlling the liquid temperature drop to the water tank of the cooling means. This is achieved by a liquid temperature control S device that is characterized by supplying .

Further, the liquid storage capacity of the water tank of the cooling means is larger than the liquid storage capacity of the water tank of the heating means, and the water tank of the heating means is achieved by a liquid temperature control device equipped with a liquid feeding means.

Furthermore, the liquid storage capacity of the water tank of the heating means is larger than the liquid storage capacity of the water tank of the cooling means, and the water tank of the cooling means is achieved by a liquid temperature control device equipped with a liquid feeding means.

Further, the heating means is provided with a heat generation source, the cooling means is provided with a heat absorption source, and the temperature of each liquid tank is achieved by a liquid temperature control device that controls the heat generation source and heat absorption source capacities ffjJ.

In addition, the ratio of the liquid storage capacity of the water tank of the cooling means and the water tank of the heating means is 2 to 6 times the liquid temperature control! 1 device.

(1) Detailed Description of the Invention Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

Embodiment 1" Figure 1 is a block diagram of an embodiment according to the present invention.
00 is a liquid temperature control device made of wood, and 200 is a heat exchanger provided in the artificial heart-lung circuit, both of which are connected by a liquid sending pipe 133 and a liquid suction pipe 134. In the liquid temperature control device 100, reference numeral 101 denotes a control device that controls the entirety of this embodiment, and the control device 10
1 includes a liquid feeding temperature setting section 101a and a cooling water tank temperature setting section 101b, which can arbitrarily set the temperature of the liquid in the water 4fillO of the heating means and the water 41!120 of the cooling means, respectively. 102 is a liquid sending pump for sending liquid at a predetermined temperature to the heat exchanger 200, 110 is a water tank as a heating means, and a liquid sending temperature detection sensor (hereinafter referred to as SR) 1 is installed inside.
11 and a heater (one built-in each of I Kw and 0.5 Kw) 112 are provided. Reference numeral 120 denotes a water tank as a cooling means, in which a cold water temperature detection sensor (hereinafter referred to as Sc), 121, and an evaporator coil 122a for absorbing heat from a refrigerator 122 are arranged. Further, 131 and 132 are electromagnetic valves.

In the L configuration, the heating water tank 110 has an internal volume of about 2 cm, the cooling water tank 120 separated from the heating water tank 110 by a partition wall has an internal volume of about 8 cm, and the refrigerator 122 has an internal volume of about 8 cm.
is a small hermetic refrigerator with a nominal output of 600W.

The suction port of the liquid pump 102 is connected to the heating water tank 110.
, and the liquid sending vibrator 133 is sent from the liquid sending pump 102.
The liquid sent to the heat exchanger 200 via the liquid suction pipe 1
34, it is converted into the device of this embodiment. This liquid-absorbing vibe 1
34 is the cooling water 4 (jl120
The liquid from the heat exchanger 200 will be sent to either of these tanks. The cooling water tank has a predetermined amount (
In the embodiment, the liquid 81) is always stored, and when the liquid is supplied from the water supply pipe, the pricking liquid is connected so that it flows (overflows) over the partition wall into the heating water tank.

The temperature WRM'1 control by the m control device 101 will be explained below with reference to the flowchart of FIG.

Read the liquid feeding temperature Ts from S, l11 in the heating water tank 110 with maj, sx, and then set this liquid feeding temperature Ts and the liquid feeding temperature setting knob VOR (101
a) Compare the target temperature Ts given by
Check whether the liquid feeding temperature Ts is higher than the set temperature Ts' by 1°C or more, and if it is not higher than the set temperature Ts', proceed to step S3, open the solenoid valve VH131, and if ffl<S4, the solenoid, FpVc1
32e Close. Therefore, the liquid forms a circular circuit of the heating water tank 110 → liquid sending pump 102 → liquid sending pipe 133 → heat exchanger 200 → liquid sending pipe 134 → solenoid valve VH 131 → heating water tank 110.

Then, at <55, the liquid feeding temperature Ts changes to the set temperature Ts.
It is checked whether the temperature is lower by 0.2°C or more, and if the temperature is lower by 0.2°C or more, the heater 112 is controlled in step S6 by time-division proportional control with a proportional band width of 0.2°C and a cycle of about 3 seconds. 0.2 in S5
If the temperature is not lower than ℃, the heater 112 is turned off.
It can be stabilized within ±0.2°C of s'. Then, both S6 and S7 proceed to 312.

In S2 described in L, the liquid sending temperature Ts is 1”0 lower than the set temperature TS.
If it is higher than that, proceed to SlO, open the solenoid valve Vc132, and close the solenoid valve VH131 at Sll. Therefore, the liquid is transferred from the heating water tank 110 to the liquid sending pipe 133 to the heat exchanger 200.
→Liquid suction pipe 134→Electric & 1ffV c l 32-”
Cooling water fi120 → (overflow) → heating water tank 11
A loop circuit returning to 0 is formed. Then, the process proceeds from Sll to the above-mentioned S7.

When proceeding to 512 from S6 or S7, the control device 101 reads the cooling water tank temperature Tc from 5c121 in the cooling water tank 120, and sets the cooling water tank temperature Tc of 411 m degrees Tc read in the continuation <513 and the cooling water tank liquid temperature of the m control device 100. Knob VOc (10
l Compare the set temperature Tc' set in b), and
If C>TC゛, turn on the refrigerator 122 at 514,
If Tc>Tc, the process proceeds to 515 and the refrigerator 122
Turn off. These controls reduce the hysteresis to approximately 0.2
The refrigerator 122 is controlled to be turned on and off within a temperature range of .degree. Note that the control of the heat generation source and the power supply source is not limited to on/off, and may be controlled by one power such as by an inverter or the like.

Then, after the processing interval T of 314 or 515, return to Sl again,
Continue temperature control.

In the control system as described above, it is clear that by maintaining the cold water temperature slightly lower than the required minimum water temperature that can be predicted in advance, arbitrary and rapid control of the liquid feeding temperature can be realized. That is, when heating, in the case of a conventional one-tank system, the total volume of normal water is about 101, due to limitations due to the physical size of the built-in cooling coil, etc.
In this embodiment, there are two pieces of water to be heated, and if a heater of the same capacity is used, the water can be heated five times faster. The heating rate for 2 fL of water alone is approximately 10.7° C./min using a 1500 W heater, and the time required to heat from 5° C. to 40° C. is approximately 3 minutes 20 seconds. Also,
During cooling, the cold water temperature in the cooling water tank is 1 higher than the target water supply temperature.
If the required amount of cold water is kept low, the target water supply temperature will be reached immediately by mixing the necessary amount of cold water with hot water.

Also, if the capacity of the water pump is 151/min, 10
The water goes through one cycle in about 45 seconds, and the hot water and cold water are completely mixed, so in this case, the target water supply temperature can be reached in several tens of seconds. In order to lower the temperature to the target water supply temperature by only mixing cold water and hot water, it is necessary that not only the temperature of the cold water is sufficiently low, but also that the cooling water tank volume Vc is sufficiently large compared to the heating water tank volume aVH.

Table 1 shows the lowest temperature that can be reached by mixing alone when the heating water tank volume is 2M and the hot water temperature is 40°C, for each cooling water tank volume and cold water temperature in the table.

Table 1 As can be easily understood from the above explanation, in the case of the cooling water tank 120 of the heating water tank 110. The water temperature can be lowered to 20°C. On the other hand, in the case of the conventional single-tank type, the capacity of the refrigerator is 1100K.
Cal/hr = 10L; 2L of water from 40℃
The time required to lower the temperature to 0° C. is approximately 11 minutes.

An example of the experimental results in this example is shown in FIG.

As shown in FIG. 3, according to this embodiment, arbitrary and rapid liquid feeding temperature control is realized. (In this experiment, the blood side of the heat exchanger 200 was in an unloaded state.) As is clear from the above experimental results, in this example, when the liquid circulates only through the heating water tank, the In some cases, heat generation due to pressure loss in the liquid delivery circuit and water temperature rise due to heat absorption from the surroundings become so large that they cannot be ignored. At this time, at the switching point Ts+l''C of the solenoid valve for the water supply temperature, a quasi-stable state occurs in which cold water repeatedly enters and stops, resulting in a temperature fluctuation of about ±1°C, but this degree of temperature fluctuation is completely unacceptable for χ. When there is no problem and Ts is very close to Ts, for example, when Ts -1<Ts<Ts'+1,
If we add a mechanism that allows the liquid in the cooling water tank to flow into the heating water tank at a very small flow rate that cancels out the temperature rise due to heat absorption from the surroundings, etc., the heat generation caused by pump circulation will be necessary. Through control, Ts is always within ±0.
It is clear that it can be kept within 2°C. The following may be considered as such a mechanism.

■Use a needle valve for flow rate adjustment as Vc132, and use Ts
> Fully open at Ts' + 1.

Ts -1 (partial opening with small flow rate when Ts<Ts'+1, It is completely closed when Ts<　Ts'-1.

■A bypass circuit is provided in parallel with Vc132 using a very small capacity solenoid valve 132B.

It is opened when Ts'-1<Ts<Ts'+1.

Here, the amount of heat received by the liquid due to actions other than the heater, such as heat absorption from the surroundings, is 20 to 5, as can be seen from the experimental results in Figure 3.
It is about 0 Kcal/hr and 50 Kcal/hr
It can be easily calculated that approximately 80 cc of cold water needs to be mixed in per minute to cancel out the amount of heat (if the difference in water temperature between the two types is 10°C)
in the case of).

L second embodiment J Next, a configuration example of another embodiment according to the present invention is shown in FIG.

The liquid temperature control device shown in FIG. 4 is a modification of the liquid temperature control device shown in FIG. The first one is a two-boat solenoid valve Vc132 and a three-point solenoid valve.
This is an example in which switching is performed by switching VH'131 corresponding to VH131 shown in the figure.

Here, during cooling, open the solenoid valve Vc132, and open the solenoid valve VH'
131' is controlled so that the liquid from the cooling water tank 120 flows into the liquid feeding pump 120, and the liquid flows into the liquid feeding pump 102.
→Heating water tank 110 →Liquid sending pipe 133 →Heat exchanger 2
00→Liquid suction pipe 134→Electricity 19Vc132+Cooling water tank 120→Solenoid valve VH131→Liquid sending pump 102 - forms a circuit that circulates.

In addition, during heating, the liquid sending pump 102→heating water tank 11O゛→liquid sending pipe 133→heat exchanger 200→liquid suction pipe 13
4→Solenoid valve VH'131→Liquid pump 102, forming a single circuit.

It is clear that by using the following configuration, it is possible to achieve exactly the same functionality as the embodiment shown in FIG. 1 above.

In the above two examples, the liquid feeding circuit is switched manually by comparing the set temperature and the liquid feeding temperature, but a simpler implementation method is to manually switch only the liquid feeding circuit. It is clear that the above methods are also effective without impairing the effects of the present invention.

In the above embodiment, the cooling water tank has a larger liquid storage capacity than the heating water tank, and the heating water tank is equipped with a liquid feeding means. A case in which a means is provided is also included within the scope of the present invention and is also effective.

The cooling device incorporated in the cooling water tank is generally a compressor-type refrigeration cycle using a refrigerant such as ammonia or chlorofluorocarbon gas, but an electronic cooling device can also be used conveniently.

Although the paddles of the heating means and the cooling means are referred to as water tanks, the liquid used in the present invention is not limited to water, and any known liquid heat medium is included within the technical scope of the present invention.

■1 Specific Effects of the Invention As explained above, according to the present invention, by controlling the liquid supply so that the liquid passes through both the large tank and the small tank or only the small tank, the liquid can be quickly and repeatedly The liquid temperature can be controlled to any desired temperature.

Further, according to a preferred embodiment of the present invention, efficient liquid temperature control can be performed by making the capacity of the water tank of the heating means larger than the capacity of the water tank of the cooling means.

Furthermore, according to a preferred embodiment of the present invention, the capacity of the water tank of the cooling means is made larger than the capacity of the water tank of the heat generating means, and the water tank of the cooling means is provided with a liquid feeding means, thereby achieving a considerably more efficient Liquid temperature can be controlled.

In addition, the water tank for the heating means is a liquid tank equipped with a heat generation source, and the water tank for the cooling means is a 1M water tank equipped with a suction means. By controlling the capacity by turning on/off the heat generating means and the heat absorbing means while closing the tank, it is possible to provide a small and efficient liquid temperature control device.

Still further, in accordance with another preferred embodiment of the present invention, the volume of the large paddle is 2 to 6 times larger than the volume of the small tank, thereby controlling the rise and fall of the liquid temperature very quickly and efficiently. can do well.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of an embodiment according to the present invention, FIG. 2 is a temperature control flowchart of this embodiment, and FIG. It is a block diagram of an Example. In the figure, 100, 100...liquid temperature control device, 101...control device, 101a...liquid feeding temperature setting section, 101b...cooling water tank liquid temperature setting section, 102...
・Liquid pump, 110.110'...Heating water tank, 12
0.120... Cooling water tank, 122... Freezer,
131.131. 132,150... Solenoid valve, 15
1... Pump, 200... Heat exchanger.

Claims (5)

[Claims] (1) A cooling means having a water tank for cooling the liquid, a heating means having a water tank for heating the liquid, and a liquid supply control means for selectively supplying the liquid to the cooling means and the heating means, the water tank of the cooling means and the water tanks of the heating means, one of which has a larger liquid storage capacity than the other, and is connected so that liquid can flow only from one tank with a large storage capacity to the other tank with a small storage capacity. ,
The small tank is equipped with a liquid sending means for sending out the liquid, and the liquid supply control means controls the heating means when controlling the temperature rise of the liquid so that the temperature of the liquid sent from the small tank is at a predetermined temperature. A liquid temperature control device characterized in that the liquid temperature is supplied to a water tank, and the liquid temperature control device is supplied to the water tank of the cooling means during liquid temperature reduction control. (2) The liquid storage capacity of the water tank of the cooling means is larger than the liquid storage capacity of the water tank of the heating means, and the water tank of the heating means is provided with a liquid feeding means. Liquid temperature control device. (3) The liquid storage capacity of the water tank of the heating means is larger than the liquid storage capacity of the water tank of the cooling means, and the water tank of the cooling means is provided with a liquid feeding means. Liquid temperature control device. (4) The heating means includes a heat generating source, the cooling means includes a heat absorbing source, and the temperature of each liquid tank is controlled by the capabilities of the heat generating source and the heat absorbing source. The liquid temperature control device according to any one of the above. (5) Liquid temperature control according to any one of claims 1 to 4, characterized in that the ratio of liquid storage volumes of the water tank of the cooling means and the water tank of the heating means is 2 to 6 times. Device.