KR102123010B1 - Apparatus for constaning temperature using direct and indirect cooling and method for controling temperatuer using the same - Google Patents

Abstract

According to an embodiment of the present invention, since direct or indirect cooling is controlled to be performed according to the temperature of the fluid in the water tank, constant temperature to prevent overloading of the compressor even when a high temperature fluid exceeding a reference temperature in the water tank is introduced. Provide a device. Direct and indirect cooling constant temperature apparatus according to an embodiment of the present invention, a refrigeration unit having an evaporator, a compressor, a condenser and an expansion valve; The evaporator performing a cooling function is installed therein, the water tank unit for discharging by raising or lowering the temperature of the flowing fluid; A heater installed inside the water tank unit to increase the temperature of the fluid; A bypass pump unit positioned between the evaporator and the condenser and connected in parallel with the expansion valve; And a distribution valve part allowing the refrigerant discharged from the condenser to selectively flow to the expansion valve or the bypass pump part.

Description

Direct and indirect cooling thermostat and temperature control method using the same {APPARATUS FOR CONSTANING TEMPERATURE USING DIRECT AND INDIRECT COOLING AND METHOD FOR CONTROLING TEMPERATUER USING THE SAME}

The present invention relates to a direct and indirect cooling constant temperature device and a temperature control method using the same, and more specifically, according to the temperature of the fluid in the water tank, the direct cooling or indirect cooling is controlled so that the reference temperature in the water tank is controlled. It relates to a constant temperature device that prevents the overload of the compressor even if an excessively high temperature fluid is introduced.

In general, a thermostat refers to a device that allows a substance such as a fluid to always maintain a constant temperature without being affected by external temperatures. According to the temperature control application of the fluid, it is classified into low-temperature and high-temperature use. In the case of low-temperature use, cooling is performed by a refrigerator using heat obtained from the load side. .

A precision temperature control device such as a constant temperature bath can be used in various fields. Recently, as the utilization of the heat pump increases, the use of a thermostat temperature maintenance system used to evaluate the performance of the heat pump to accurately evaluate the performance of the heat pump is increasing. In addition, the thermostat widely used in the field of biotechnology, while maintaining the water contained in the water bath (water bath) at a constant temperature (usually 36.5 ℃), a tray containing a sample container, such as a flask or a test tube containing a culture solution tank The temperature control mechanism is used to keep the temperature of the culture medium constant by heat exchange by conduction by immersing the sample container in the water of the water bath. In addition, it is used in a simulation load test performed in a laboratory.

In the Republic of Korea Patent No. 10-1456877 (invention name: constant temperature bath temperature maintenance system, hereinafter referred to as prior art 1), the heat pump subject to performance evaluation, and the heat pump according to the operation mode change of the heat pump A first constant temperature tank for maintaining and storing a first constant temperature fluid that exchanges heat with a heat pump refrigerant in a first heat exchanger or a second heat exchanger at a predetermined temperature, and a second heat pump according to a change in the operation mode of the heat pump A second constant temperature tank that maintains and stores a second constant temperature fluid that exchanges heat with a heat pump refrigerant in a heat exchanger or a first heat exchanger at a predetermined temperature, and a second constant temperature fluid of the first constant temperature fluid and the second constant temperature tank of the first constant temperature tank A constant temperature fluid heat exchanger that exchanges fluid with each other, a freezer that allows the second constant temperature fluid of the second constant temperature bath to exchange heat with a refrigerant, and a constant temperature bath having a first electric heater that heats the first constant temperature fluid that has passed through the constant temperature fluid heat exchanger. A temperature maintenance system is disclosed.

Korean Registered Patent No. 10-1456877, Korean Registered Patent No. 10-1588388, Korean Registered Patent No. 10-1762264, Korean Registered Patent No. 10-1888553, Korean Registered Patent No. 10-1801647, Korean Application Patent No. 10 -2017-0148149

An object of the present invention for solving the above problems is to perform cooling without damaging the constant temperature device even if a high temperature fluid is introduced into the constant temperature device.

The technical problem to be achieved by the present invention is not limited to the technical problems mentioned above, and other technical problems not mentioned can be clearly understood by a person having ordinary knowledge in the technical field to which the present invention belongs from the following description. There will be.

Configuration of the present invention for achieving the above object, a refrigeration unit having an evaporator, a compressor, a condenser and an expansion valve; The evaporator performing a cooling function is installed therein, the water tank unit for discharging by raising or lowering the temperature of the flowing fluid; A heater installed inside the water tank unit to increase the temperature of the fluid; A bypass pump unit positioned between the evaporator and the condenser and connected in parallel with the expansion valve; And a distribution valve part allowing the refrigerant discharged from the condenser to selectively flow to the expansion valve or the bypass pump part.

In an embodiment of the present invention, the distribution valve unit allows the refrigerant to flow to the expansion valve when the temperature of the fluid in the water tank is below the reference temperature, and when the temperature of the fluid in the water tank exceeds the reference temperature It can be made to flow to the bypass pump.

In an embodiment of the present invention, the reference temperature may be a temperature selected from a temperature range of 45 to 55 degrees (°C).

In an embodiment of the present invention, an indirect cooling piping unit that provides a flow path to the refrigerant flowing out of the evaporator and flowing into the condenser, and a flow path to the refrigerant flowing out of the evaporator and passing through the compressor and then flowing into the condenser. It may further include a direct cooling piping provided.

In an embodiment of the present invention, the indirect cooling valve is coupled to the indirect cooling pipe and opens and closes a flow path of the refrigerant flowing along the indirect cooling pipe, and

A direct cooling valve coupled to the direct cooling pipe and opening and closing a flow path of the refrigerant flowing along the direct cooling pipe may be further included.

In an embodiment of the present invention, when the temperature of the fluid in the water tank is below the reference temperature, the direct cooling valve is opened, the indirect cooling valve is closed, and the temperature of the fluid in the water tank is above the reference temperature The direct cooling valve may be closed and the indirect cooling valve may be opened.

In an embodiment of the present invention, the water tank unit may include a temperature sensor.

In an embodiment of the present invention, the heater may include a heating wire that generates heat by application of electric power.

In an embodiment of the present invention, it is installed between the condenser and the expansion valve, at the same time is installed between the condenser and the bypass pump portion, may further include a receiver tank for temporarily storing the refrigerant.

The configuration of the present invention for achieving the above object, a) setting the reference temperature, and measuring the temperature of the fluid in the water tank portion; b) determining whether the temperature of the fluid in the water tank exceeds the reference temperature; c) When the temperature of the fluid in the water tank part exceeds the reference temperature, the refrigerant discharged from the evaporator sequentially passes through the condenser and the bypass pump part and enters the evaporator to indirectly cool the fluid in the water tank part The step in which it is performed; d) When the temperature of the fluid in the water tank is below a reference temperature, the refrigerant flowing out of the evaporator sequentially passes through the compressor, the condenser and the expansion valve and enters the evaporator, whereby the refrigerant circulates through the refrigerating unit By performing a direct cooling of the fluid in the water tank portion; And e) determining whether the temperature of the fluid in the water tank is equal to the reference temperature.

The effect of the present invention according to the above configuration is controlled according to the temperature of the fluid in the water tank, so that direct cooling or indirect cooling is performed, so that even if a high temperature fluid exceeding the reference temperature in the water tank is introduced, the overload of the compressor This prevents damage to the whole thermostat and increases efficiency.

It should be understood that the effects of the present invention are not limited to the above-described effects, and include all effects that can be deduced from the configuration of the invention described in the detailed description or claims of the present invention.

1 is a schematic diagram of a constant temperature device according to an embodiment of the present invention.
2 is an algorithm flowchart of a temperature control method using a constant temperature device according to an embodiment of the present invention.

Hereinafter, the present invention will be described with reference to the accompanying drawings. However, the present invention may be implemented in various different forms, and thus is not limited to the embodiments described herein. In addition, in order to clearly describe the present invention in the drawings, parts irrelevant to the description are omitted, and like reference numerals are assigned to similar parts throughout the specification.

Throughout the specification, when a part is "connected (connected, contacted, coupled)" with another part, it is not only "directly connected" but also "indirectly connected" with another member in between. "It also includes the case where it is. Also, when a part “includes” a certain component, this means that other components may be further provided instead of excluding other components, unless otherwise stated.

The terms used in this specification are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this specification, terms such as “include” or “have” are intended to indicate that a feature, number, step, operation, component, part, or combination thereof described in the specification exists, and that one or more other features are present. It should be understood that the existence or addition possibilities of fields or numbers, steps, operations, components, parts or combinations thereof are not excluded in advance.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic diagram of a constant temperature device according to an embodiment of the present invention. As shown in Figure 1, the constant temperature device of the present invention, evaporator 630, a compressor 640, a condenser 650 and a refrigeration unit having an expansion valve 310; An evaporator 630 that performs a cooling function is installed therein, and a water tank unit 610 for discharging the temperature of the inflowing fluid by raising or lowering it; A heater 620 installed inside the water tank unit 610 to increase the temperature of the fluid; A bypass pump unit 110 positioned between the evaporator 630 and the condenser 650 and connected in parallel with the expansion valve 310; And a distribution valve unit 200 that allows the refrigerant discharged from the condenser 650 to selectively flow to the expansion valve 310 or the bypass pump unit 110. And, the constant temperature device of the present invention is installed between the condenser 650 and the expansion valve 310, and at the same time is installed between the condenser 650 and the bypass pump unit 110, the receiver tank 660 for temporarily storing the refrigerant ) May be further included. Here, the condenser 650 and the receiver tank 660 may be connected by a receiver pipe 661. The receiver tank 660 may temporarily store the liquefied refrigerant in the condenser 650, so that only the liquid refrigerant flows to the expansion valve 310 or the bypass pump unit 110. Hereinafter, a constant temperature device of the present invention including a receiver tank 660 will be described.

The heater 620 may include a heating wire that generates heat by application of electric power. When the fluid flowing into the water tank unit 610 is lower than the constant temperature set temperature set as the fluid temperature in the water tank unit 610, the heater 620 may heat the fluid in the water tank unit 610 to increase the temperature. Correspondingly, when the temperature of the fluid flowing into the water tank unit 610 is higher than the constant temperature setting temperature, the water tank unit 610 cools the fluid in the water tank unit 610 with the evaporator 630 to decrease the temperature. Can be.

For the above temperature rise or fall, the constant temperature device of the present invention, the refrigeration unit, the heater 620, the bypass pump unit 110, the distribution valve unit 200, the direct cooling valve 520 and indirect cooling below It may include a control unit for controlling the valve 420.

The constant temperature device of the present invention, the first expansion pipe 321 connecting the receiver tank 660 and the expansion valve 310 and the second expansion pipe 322 connecting the expansion valve 310 and the evaporator 630 It may include an expansion pipe portion 320 made. And, the constant temperature device of the present invention, the first pump pipe 121 connecting the receiver tank 660 and the bypass pump unit 110 and the second pump pipe connecting the bypass pump unit 110 and the evaporator 630 It may include a pump piping 120 made of (122).

In addition, the distribution valve unit 200 is coupled to the first expansion pipe 321 and opens and closes the flow path of the refrigerant flowing along the first expansion pipe 321, the first distribution valve 210, and the first pump pipe It may include a second distribution valve 220, which is coupled to the 121 and opens and closes the flow path of the refrigerant flowing along the first pump pipe (121). Here, the first distribution valve 210 and the second distribution valve 220 may be formed of solenoid valves, and the first distribution valve 210 and the second distribution valve 220 may receive control signals from the control unit. have.

The constant temperature device of the present invention, the indirect cooling piping unit 410 providing a flow path to the refrigerant flowing out of the evaporator 630 and flowing into the condenser 650, and the evaporator 630 flowing out through the compressor 640 Next, a direct cooling piping unit 510 providing a flow path to the refrigerant flowing into the condenser 650 may be further included. And, the constant temperature device of the present invention, coupled with the indirect cooling pipe, indirect cooling valve 420 to open and close the flow path of the refrigerant flowing along the indirect cooling pipe, and the direct cooling pipe, and flow along the direct cooling pipe It may further include a direct cooling valve 520 for opening and closing the flow path of the refrigerant. Here, the direct cooling valve 520 and the indirect cooling valve 420 may be formed of a solenoid valve, and the direct cooling valve 520 and the indirect cooling valve 420 may receive a control signal from the control unit. In addition, the direct cooling piping unit 510 includes a first direct cooling pipe 511 connecting the evaporator 630 and the compressor 640, and a second direct cooling connecting the compressor 640 and the condenser 650. It may include a pipe (512).

The distribution valve unit 200 allows the refrigerant to flow to the expansion valve 310 when the temperature of the fluid in the water tank unit 610 is lower than the reference temperature, and when the temperature of the fluid in the water tank unit 610 exceeds the reference temperature It can be made to flow to the bypass pump unit 110. In addition, when the temperature of the fluid in the water tank unit 610 is below the reference temperature, the direct cooling valve 520 is opened, the indirect cooling valve 420 is closed, and the temperature of the fluid in the water tank unit 610 is higher than the reference temperature. The direct cooling valve 520 may be closed and the indirect cooling valve 420 may be opened.

Here, the reference temperature may be a temperature selected from a temperature range of 45 to 55 degrees (°C). And, preferably, the reference temperature can be set to 50 degrees (°C).

When a high temperature (temperature exceeding a reference temperature) fluid flows into the water tank unit 610, and when the high temperature fluid is cooled by the freezing unit, an excessive load may be generated in the compressor 640 of the freezing unit. This excessive load of the compressor 640 may result in damage to the compressor 640 and damage to the entire thermostat.

In order to prevent such damage, the constant temperature device of the present invention, when the temperature of the fluid in the water tank unit 610 is below the reference temperature, forms a flow path so that the refrigerant passes through the compressor 640 and the expansion valve 310 In addition, when the temperature of the fluid in the water tank unit 610 exceeds the reference temperature, a flow path may be formed so that the refrigerant does not pass through the compressor 640 and the expansion valve 310. Details of this will be described in the following temperature control method.

Hereinafter, a temperature control method using the constant temperature device of the present invention will be described. 2 is an algorithm flowchart of a temperature control method using a constant temperature device according to an embodiment of the present invention. 2 is a flowchart for a case where the reference temperature is set to 50°C.

In step S10, a reference temperature is set, and the temperature of the fluid in the water tank unit 610 can be measured. Then, in step S20, it may be determined whether the temperature of the fluid in the water tank unit 610 exceeds the reference temperature. Here, the temperature of the fluid in the water tank unit 610 is transmitted to the control unit in real time, and the control unit may determine whether the temperature of the fluid in the water tank unit 610 is lower than or above the reference temperature. Here, the data for the reference temperature is stored in the control unit, the reference temperature and the temperature of the fluid in the water tank unit 610 can be compared and measured in real time.

When it is determined in the control unit that the temperature of the fluid in the water tank unit 610 exceeds the reference temperature in step S20, step S30 is performed, so that the refrigerant leaked from the evaporator 630 condensers 650 and the bypass pump unit 110. It may be sequentially passed into the evaporator 630 to indirectly cool the fluid in the water tank unit 610. Here, the distribution valve unit 200 allows the refrigerant to flow to the bypass pump unit 110, the direct cooling valve 520 coupled with the direct cooling pipe is closed, and the indirect cooling valve 420 coupled with the indirect cooling pipe is opened. Can be.

Specifically, when the control unit determines that the temperature of the fluid in the water tank unit 610 is higher than the reference temperature, the control unit transmits a control signal to the first distribution valve 210 and the second distribution valve 220, thereby The distribution valve 210 may be opened and the second distribution valve 220 may be closed. In addition, the control unit may transmit a control signal to the direct cooling valve 520 and the indirect cooling valve 420, so that the direct cooling valve 520 is closed and the indirect cooling valve 420 is opened. In addition, the control unit may transmit a control signal to the compressor 640 and the expansion valve 310 so that the compressor 640 stops and the expansion valve 310 stops. In addition, the control unit may transmit the control signal to the bypass pump unit 110 to allow the bypass pump unit 110 to operate.

Accordingly, the refrigerant circulating the constant temperature device of the present invention, after flowing out from the evaporator 630, the indirect cooling pipe 410, the condenser 650, the receiver tank 660, the first pump pipe 121, The bypass pump unit 110 and the second pump piping 122 flow while sequentially passing through, and may be introduced into the evaporator 630 again. And, as described above, bypassing without passing through the compressor 640 and the expansion valve 310 may be referred to as indirect cooling to cool by flowing the refrigerant.

If the controller determines that the temperature of the fluid in the water tank unit 610 is less than or equal to the reference temperature in step S20, step S40 is performed, so that the refrigerant leaked from the evaporator 630 is a compressor 640, a condenser 650, and an expansion valve ( 310) is sequentially passed through the evaporator 630, the refrigerant circulates through the refrigeration unit, and flows into the fluid in the water tank unit 610, whereby direct cooling may be performed. Here, the distribution valve unit 200 allows the refrigerant to flow to the expansion valve 310, the direct cooling valve 520 combined with the direct cooling pipe is opened, and the indirect cooling valve 420 combined with the indirect cooling pipe is closed. Can be.

Specifically, when the control unit determines that the temperature of the fluid in the water tank unit 610 is lower than or equal to the reference temperature, the control unit transmits a control signal to the first distribution valve 210 and the second distribution valve 220, so that the first distribution The valve 210 may be closed and the second distribution valve 220 may be opened. Then, the control unit may transmit a control signal to the direct cooling valve 520 and the indirect cooling valve 420, so that the direct cooling valve 520 is opened and the indirect cooling valve 420 is closed. In addition, the control unit may transmit a control signal to the compressor 640 and the expansion valve 310 so that the compressor 640 operates and the expansion valve 310 operates. In addition, the control unit may transmit the control signal to the bypass pump unit 110 so that the bypass pump unit 110 stops.

Accordingly, the refrigerant circulating the constant temperature device of the present invention, after flowing out from the evaporator 630, the first direct cooling pipe 511, the compressor 640, the second direct cooling pipe 512, the condenser 650 , Flowing through the receiver tank 660, the first expansion pipe 321, the expansion valve 310 and the second expansion pipe 322 sequentially, it may be introduced into the evaporator 630 again. And, as described above, performing cooling according to an existing method may be referred to as direct cooling.

Next, in step S50, it may be determined whether the temperature of the fluid in the water tank unit 610 is equal to the reference temperature. Here, when the control unit determines that the temperature of the fluid in the water tank unit 610 is the same as the reference temperature, temperature control by direct cooling or indirect cooling as described above may be ended. Then, if it is determined that the temperature of the fluid in the water tank unit 610 is not the same as the reference temperature, step S20 may be performed again.

As described above, when the fluid in the water tank unit 610 is determined to be a high temperature exceeding the reference temperature, the refrigerant flows along the flow path in the indirect cooling, and accordingly, indirect cooling of the fluid in the water tank unit 610 is performed. Can be.

In addition, indirect cooling of the high temperature fluid in the water tank unit 610 is performed, so that the high temperature fluid temperature in the water tank unit 610 decreases, or a fluid having a temperature lower than a reference temperature is introduced into the water tank unit 610, When the fluid in the water tank unit 610 is determined to be below the reference temperature, the refrigerant flows along the flow path in direct cooling, and accordingly, direct cooling of the fluid in the water tank unit 610 may be performed.

As such, according to the temperature of the fluid in the water tank unit 610, since the constant temperature device of the present invention is controlled to perform direct cooling or indirect cooling, even if a high temperature fluid exceeding the reference temperature in the water tank unit 610 is introduced, By preventing the overload of the compressor 640, it is possible to prevent damage to the thermostat device of the present invention and increase efficiency.

The above description of the present invention is for illustration only, and those skilled in the art to which the present invention pertains can understand that the present invention can be easily modified into other specific forms without changing the technical spirit or essential features of the present invention. will be. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive. For example, each component described as a single type may be implemented in a distributed manner, and similarly, components described as distributed may be implemented in a combined form.

The scope of the present invention is indicated by the following claims, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts should be interpreted to be included in the scope of the present invention.

110: bypass pump unit 120: pump piping unit
121: first pump piping 122: second pump piping
200: distribution valve 210: first distribution valve
220: second distribution valve 310: expansion valve
320: expansion piping 321: first expansion piping
322: second expansion piping 410: indirect cooling piping
420: indirect cooling valve 510: direct cooling piping
511: 1st direct cooling pipe 512: 2nd direct cooling pipe
520: direct cooling valve 610: water tank
620: heater 630: evaporator
640: compressor 650: condenser
660: receiver tank 661: receiver piping

Claims (10)

A refrigerating unit having an evaporator, a compressor, a condenser and an expansion valve;
The evaporator performing a cooling function is installed therein, the water tank unit for discharging by increasing or decreasing the temperature of the incoming fluid;
A heater installed inside the water tank unit to increase the temperature of the fluid;
A bypass pump unit positioned between the evaporator and the condenser and connected in parallel with the expansion valve;
A distribution valve portion allowing the refrigerant discharged from the condenser to selectively flow to the expansion valve or the bypass pump portion; And
Includes a control unit for determining whether the temperature of the fluid in the water tank portion exceeds the reference temperature;
When the temperature of the fluid in the water tank part exceeds the reference temperature, the refrigerant discharged from the evaporator sequentially passes through the condenser and the bypass pump part and flows into the evaporator to indirectly cool the fluid in the water tank part. And
When the temperature of the fluid in the water tank is below a reference temperature, the refrigerant flowing out of the evaporator passes through the compressor, the condenser and the expansion valve sequentially and enters the evaporator, whereby the refrigerant circulates through the refrigerating unit Direct and indirect cooling constant temperature device, characterized in that direct cooling of the fluid in the water tank portion is performed.
The method according to claim 1,
The distribution valve unit, when the temperature of the fluid in the water tank portion is below the reference temperature, the refrigerant flows to the expansion valve, and when the temperature of the fluid in the water tank portion exceeds the reference temperature, the refrigerant to flow to the bypass pump portion Features direct and indirect cooling constant temperature devices.
The method according to claim 2,
The reference temperature is a direct and indirect cooling constant temperature device, characterized in that the temperature selected from the temperature range of 45 to 55 degrees (℃).
The method according to claim 2,
An indirect cooling piping unit providing a flow path to the refrigerant flowing out of the evaporator and flowing into the condenser, and
Direct and indirect cooling constant temperature device further comprises a direct cooling pipe portion, which flows out of the evaporator, passes through the compressor, and then provides a flow path to the refrigerant flowing into the condenser.
The method according to claim 4,
An indirect cooling valve coupled to the indirect cooling pipe and opening and closing a flow path of the refrigerant flowing along the indirect cooling pipe, and
Direct and indirect cooling constant temperature device, characterized in that it further comprises a direct cooling valve, which is coupled to the direct cooling pipe and opens and closes the flow path of the refrigerant flowing along the direct cooling pipe.
The method according to claim 5,
When the temperature of the fluid in the water tank is below the reference temperature, the direct cooling valve is opened and the indirect cooling valve is closed, and when the temperature of the fluid in the water tank is above the reference temperature, the direct cooling valve is closed and the Direct and indirect cooling constant temperature device characterized in that the indirect cooling valve is opened.
The method according to claim 1,
The water tank unit, a direct and indirect cooling constant temperature device characterized in that it comprises a temperature sensor.
The method according to claim 1,
The heater, the direct and indirect cooling constant temperature apparatus characterized in that it comprises a heating wire that generates heat by the application of electric power.
The method according to claim 1,
Direct and indirect cooling constant temperature device, characterized in that it is installed between the condenser and the expansion valve, at the same time is installed between the condenser and the bypass pump portion, and further comprising a receiver tank for temporarily storing the refrigerant.
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