JP2016205742A - Cooling system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cooling system capable of accurately controlling a temperature of circulation liquid such as circulation water not only when a load of a heating source of an external connection destination is over a specified amount but also when a load of the heating source of the external connection destination is the specified amount or less.SOLUTION: A cooling system 50 includes a tank 16 for accommodating circulation liquid, and a refrigeration machine circuit 51 having an inverter-type refrigeration machine 1 in which a refrigerant passes, a condenser 3, an expansion valve 5, and an evaporator 7, and cooling the circulation liquid sent from a heating source through the evaporator 7. The refrigeration machine circuit 51 is provided with a bypass circuit 40 for adjusting a flow rate of the refrigerant flowing to an expansion valve 4 side by allowing the refrigerant to pass from a high-pressure refrigeration pipe 4 to a low-pressure refrigeration pipe 8, and a range RH1 of a first cooling capacity of the refrigeration machine circuit 51 in closing the bypass circuit 40, and a range RH2 of a second cooling capacity of the refrigeration machine circuit 51 in opening the bypass circuit, are determined.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a cooling system that includes an inverter-type refrigerator circuit and circulates a cooling-controlled liquid such as a cooling water circulation device that circulates cooling water to cool a heat load connected to the outside.

  A conventional cooling water circulation device 500 shown in FIG. 6 is equipped with an inverter type refrigerator circuit 600 and circulates the cooling water. The cooling water circulation device 500 includes a water tank 116 that stores the circulating fluid WT, an inverter type refrigerator circuit 600 that circulates and cools the circulating fluid WT, and a controller 121.

  The inverter-type refrigerator circuit 600 includes an inverter-type refrigerator 101, an air-cooled condenser 103, an expansion valve 105, and an evaporator 107. The inverter type refrigerator 101 compresses the refrigerant, the condenser 103 condenses the refrigerant, the expansion valve 105 expands the refrigerant, and the evaporator 107 evaporates the refrigerant.

  The circulating fluid WT returns from the external circulation return connecting portion 131 connected to a device that requires cooling of the heat source, and this circulating fluid WT passes through the circulating water return pipe 114, the evaporator 107, and the circulating water return pipe 115. The water tank 116 is entered. The circulating fluid WT in the water tank 116 passes through the circulating water discharge pipe 118, the pump 119, and the circulating water discharge pipe 120, and is supplied from the heat source that is the target for supplying the circulating liquid WT via the external circulation discharge connection portion 132. It is discharged to an apparatus that requires cooling.

  In the cooling water circulation device 500 described above, the temperature control of the circulating water (an example of circulating fluid) is performed by varying the output of the inverter refrigerator 101. The external circulation return connection part 131 and the external circulation discharge connection part 132 are connected to a device that requires cooling of the heat generation source, and the cooling water circulation device 500 cools the heat generation source with the circulating fluid WT controlled to be cooled to a constant temperature. .

  By the inverter control of the conventional inverter type refrigerator 101, the maximum cooling capacity generated by the evaporator 107 is set as the upper limit, and the output of the inverter type refrigerator 101 is lowered to change the cooling capacity until the load amount of the heat source is constant. It is possible to precisely control the temperature of the cooling system.

  Moreover, this kind of cooling water circulation apparatus is disclosed by patent document 1, for example. The cooling water circulation device of Patent Document 1 includes a water tank that stores circulating water, a refrigerator that cools the circulating water, and a heater that heats the circulating water, and in order to appropriately control the temperature fluctuation range of the circulating water, ON / OFF control to turn off the heater, and a second operation mode in which the refrigerator is turned on and precise temperature control of the circulating water is performed using the heater.

JP 2007-40631 A

  However, in the cooling water circulation device 500 equipped with the conventional inverter type refrigerator circuit 600, the circulating fluid WT is controlled by controlling the output of the inverter type refrigerator 101 according to the load amount of the heat source at the external connection destination. Perform precise control at a constant temperature. This precise controllable range is shown as a graph in FIG. In the graph shown in FIG. 7, the vertical axis represents the cooling capacity (W) of the circulating water, and the horizontal axis represents the inverter frequency (Hz) of the inverter type refrigerator 101 of FIG. 6.

  As shown in FIG. 7, the range in which the temperature can be precisely controlled by controlling the output of the inverter type refrigerator 101 of FIG. 6 is the maximum cooling that the load amount of the heat source at the external connection destination is generated in the evaporator 107. The range is from the capacity “a” W to the minimum cooling capacity “b” W of about 40%.

  In addition, when the load amount of the heat source is less than the minimum cooling capacity “b” W, it is not within the range in which the temperature can be precisely controlled by controlling the output of the inverter refrigerator 101. Control was performed by intermittently stopping the operation of the refrigerator 101.

  As described above, in the cooling water circulation device 500 in which the inverter type refrigerator circuit 600 is mounted, the operation of the inverter type refrigerator 101 must be temporarily stopped for a load amount of a heat source less than a certain amount. Therefore, the temperature control of the circulating fluid WT becomes intermittent and unstable.

  Moreover, in the cooling water circulation device of Patent Document 1, in order to perform the first operation mode and the second operation mode using a heater, it is necessary to control the temperature of the circulating water in a complicated manner.

  The present invention has been made in view of the above, and the object of the present invention is not only when the load amount of the heat source at the external connection destination exceeds a certain amount, but also the load amount of the heat source at the external connection destination. An object of the present invention is to provide a cooling system capable of precise temperature control of circulating fluid such as circulating water even in the case of a certain amount or less.

  In order to achieve the above object, a cooling system according to a first aspect of the present invention includes a tank for storing a circulating fluid, an inverter type refrigerator that passes a refrigerant, a condenser, an expansion valve, and an evaporator, and is sent from a heat source. A refrigerating machine circuit that cools the circulating fluid that is passed through the evaporator, and the refrigerating machine circuit includes a high-pressure refrigerating pipe that connects the condenser and the expansion valve, and the evaporator and the A bypass circuit for adjusting the flow rate of the refrigerant flowing to the expansion valve side by passing the refrigerant through a low-pressure refrigeration pipe connecting an inverter type refrigerator is provided, and the refrigerator circuit when the bypass circuit is closed The first cooling capacity range and the second cooling capacity range of the refrigerator circuit when the bypass circuit is opened are set.

  In the cooling system according to claim 1, the range of the first cooling capacity of the refrigerator circuit when the bypass circuit is closed, the range of the second cooling capacity of the refrigerator circuit when the bypass circuit is opened, Is set. As a result, the cooling system is within the range of the first cooling capacity when the load amount of the heat source at the external connection destination exceeds a certain amount, and when the load amount of the heat source at the external connection destination is less than the certain amount. Precise temperature control of the circulating fluid such as circulating water is possible within the range of the second cooling capacity.

  The cooling system according to claim 2, wherein the expansion valve is an electronic expansion valve that controls a flow rate of the refrigerant by adjusting an opening degree based on a temperature of the circulating fluid in the tank. Features.

  In the cooling system according to claim 2, by using an electronic expansion valve in the refrigerator circuit, the cooling system has a first cooling capacity range and a second cooling capacity range, such as circulating water. Precise temperature control of circulating fluid is possible.

  The cooling system according to claim 3, wherein the expansion valve adjusts the flow rate of the refrigerant by adjusting the temperature of the refrigerant sent from the evaporator to the inverter refrigerator through the low-pressure refrigeration pipe. It is a mechanical expansion valve to be controlled.

  In the cooling system according to claim 3, by using a mechanical expansion valve in the refrigerator circuit, the cooling system has a first cooling capacity range and a second cooling capacity range, such as circulating water. Precise temperature control of circulating fluid is possible.

  In the cooling system according to claim 4, an opening / closing operation unit for the refrigerant is disposed in the bypass circuit, and the opening / closing operation unit is provided in the bypass circuit based on a temperature of the circulating liquid in the tank. It is characterized by opening and closing.

  In the cooling system according to claim 4, by using the opening / closing operation unit in the bypass circuit, the cooling system is capable of supplying the circulating fluid such as circulating water in the first cooling capacity range and the second cooling capacity range. Precise temperature control is possible.

  In the cooling system according to claim 5, the bypass circuit includes a bypass refrigeration pipe connecting the high-pressure refrigeration pipe and the low-pressure refrigeration pipe, an electromagnetic valve and a capillary tube provided in the middle of the bypass refrigeration pipe, A range of the first cooling capacity of the refrigerator circuit when the solenoid valve of the bypass circuit is closed and a second cooling capacity of the refrigerator circuit when the solenoid valve of the bypass circuit is opened. The range is set to partially overlap.

  In the cooling system according to claim 5, a range of the first cooling capacity when the solenoid valve of the bypass circuit is closed and a range of the second cooling capacity when the solenoid valve of the bypass circuit is opened are partly. Overlap. Thus, when the solenoid valve is closed and set to the first cooling capacity range, and when the solenoid valve is opened and set to the second cooling capacity range, the temperature of the circulating fluid is within the first cooling capacity range. In the range of the second cooling capacity, it is possible to control precisely and continuously without a break.

  The cooling system according to claim 6, further comprising a coolant circulation path that circulates the circulating fluid from the heat generation source into the tank, and the circulating fluid that passes through the coolant circulation path passes through the coolant circuit. It cools by performing heat exchange with the said refrigerant | coolant in an evaporator.

  In the cooling system according to the sixth aspect, the circulating liquid circulated in the tank can be cooled by exchanging heat in the evaporator by passing through the cooling liquid circulation path.

  According to the present invention, not only when the load amount of the heat source at the external connection destination exceeds a certain amount, but also when the load amount of the heat source at the external connection destination is not more than a certain amount, A cooling system capable of precise temperature control of the circulating fluid.

It is a figure which shows 1st Embodiment of the cooling system of this invention. It is a figure which shows the bypass circuit provided in the cooling system shown in FIG. In the cooling system shown in FIG. 1, it is a figure which shows the example of the range which can control the circulating water WT precisely to a fixed temperature by controlling the output of an inverter type refrigerator. It is a figure which shows 2nd Embodiment of the cooling system of this invention. It is a figure which shows 3rd Embodiment of the cooling system of this invention. It is a figure which shows the cooling water circulation apparatus (cooling system) carrying the conventional inverter type refrigerator machine. FIG. 7 is a diagram showing a range in which the circulating fluid can be precisely controlled to a constant temperature by controlling the output of the inverter type refrigerator in the conventional cooling water circulation device shown in FIG. 6.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention (hereinafter referred to as embodiments) will be described with reference to the drawings.

<First Embodiment>
FIG. 1 is a diagram showing a first embodiment of the cooling system of the present invention. FIG. 2 is a diagram illustrating a bypass circuit provided in the cooling system illustrated in FIG. 1.

  The cooling system 50 shown in FIG. 1 is an inverter type cooling water circulation device using cooling water, for example. The cooling system 50 cools the heat source by supplying circulating water WT having a certain temperature or higher to a device that requires cooling of a heat source (not shown) that is a cooling water supply target. It is a system for performing. The external circulation return connection portion 90 and the external circulation discharge connection portion 91 are connected to a device that requires cooling of the heat source. Circulating water WT is also called cooling water, and is an example of circulating liquid.

  A cooling system 50 shown in FIG. 1 includes a water tank 16 that contains circulating water WT, an inverter-type refrigerator circuit 51, a cooling water circulation path 80, and a controller 21 as a control unit.

  The water tank 16 is a storage tank that stores the circulating water WT. This water tank 16 accommodates circulating water WT returned from a device that requires cooling of an external heat source through an external circulation return connection portion 90 and passing through a cooling water circulation path 80. Thereafter, the circulating water WT is discharged from the external circulation discharge connection portion 91 via the cooling water circulation path 80 to an apparatus that requires cooling of the heat generation source.

  A temperature sensor 17 is disposed at the bottom of the water tank 16. The temperature sensor 17 is temperature detecting means for detecting the temperature of the circulating water WT accommodated in the water tank 16.

  The inverter type refrigerator circuit 51 shown in FIG. 1 will be described.

  The inverter-type refrigerator circuit 51 includes an inverter-type refrigerator 1, a high-pressure refrigeration pipe 2, an air-cooled condenser 3, a high-pressure refrigeration pipe 4, an electronic expansion valve 5, a low-pressure refrigeration pipe 6, an evaporator 7, and a low-pressure refrigeration. It has a pipe 8.

  The inverter refrigerator 1 is arranged between the high-pressure refrigeration pipe 2 and the low-pressure refrigeration pipe 8. The inverter refrigerator 1 performs refrigerant compression, the condenser 3 performs refrigerant condensation, the electronic expansion valve 5 performs refrigerant expansion, and the evaporator 7 evaporates and evaporates the refrigerant.

  The refrigerant pipe 3 t of the condenser 3 is disposed between the high-pressure refrigeration pipe 2 and the high-pressure refrigeration pipe 4. The electronic expansion valve 5 is disposed between the high pressure refrigeration pipe 4 and the low pressure refrigeration pipe 6. The refrigerant pipe 7 a of the evaporator 7 is disposed between the low pressure refrigeration pipe 6 and the low pressure refrigeration pipe 8.

  Next, the bypass circuit 40 shown in FIGS. 1 and 2 will be described.

  FIG. 2 shows the bypass circuit 40 shown in FIG. 1, and the bypass circuit 40 shown in FIGS. 1 and 2 is connected between the high-pressure refrigeration pipe 4 and the low-pressure refrigeration pipe 8. The bypass circuit 40 bypasses the refrigerant from the high-pressure refrigeration pipe 4 side to the low-pressure refrigeration pipe 8 side as necessary, and bypass-refrigeration pipe 9, bypass refrigeration pipe 12, bypass refrigeration pipe 9, and bypass refrigeration. A solenoid valve 10 and a capillary tube 11 are arranged between the pipes 12.

  This bypass circuit 40 is a bypass that directly connects the high pressure refrigeration pipe 4 between the condenser 3 and the electronic expansion valve 5 to the low pressure refrigeration pipe 8 between the evaporator 7 and the inverter type refrigerator 1. It is arranged as a route.

  In the example shown in FIG. 1, proper on / off control (opening / closing control) of the solenoid valve 10 of the bypass circuit 40 is performed according to the temperature of the circulating water WT in the water tank 16 detected by the temperature sensor 17. This is done according to 21 commands. That is, the controller 21 monitors the temperature detection signal A in the tank 16 obtained from the temperature sensor 17, and the controller 21 performs appropriate on / off control (opening) of the electromagnetic valve 10 according to the temperature load in the water tank 16. / Close control).

  Next, the cooling water circulation path 80 shown in FIG. 1 will be described.

  The cooling water circulation path 80 includes a circulating water return pipe 14, a pipe line 7 b of the evaporator 7, a circulating water return pipe 15, a circulating water discharge pipe 18, a pump 19, and a circulating water discharge pipe 20. The circulating water return pipe 14 connects the external circulation return connection part 90 and the pipe line 7 b, and the circulating water return pipe 15 connects the pipe line 7 b and the connection part 16 c of the water tank 16.

  The circulating water discharge pipe 18 connects the connection part 16 d of the water tank 16 and the pump 19, and the circulating water discharge pipe 20 connects the pump 19 and the external circulation discharge connection part 91. The temperature sensor 17 is disposed at the connection portion 16 d of the water tank 16.

  As a result, when the pump 19 is operated according to a command from the controller 21, the circulating water WT returned from the device that requires cooling of the external heat source via the external circulation return connecting portion 90 passes through the circulating water return pipe 14 and the evaporator 7. After being heat-exchanged and cooled, the water is stored in the water tank 16 through the circulating water return pipe 15.

  And the circulating water WT accommodated in the water tank 16 passes through the circulating water discharge pipe 18, the pump 19, and the circulating water discharge pipe 20, and from the external circulation discharge connection part 91 to the apparatus which requires cooling of an external heat source. Thus, it can be discharged at a predetermined temperature.

  Incidentally, as indicated by a broken line in FIG. 1, the temperature sensor 17 detects the temperature of the circulating water WT in the water tank 16 and sends a temperature detection signal A to the controller 21. Thereby, the controller 21 performs the output control of the inverter refrigerator 1 using the power line F in order to change the cooling capacity in the evaporator 7 based on the temperature detection signal A. Thereby, the temperature in the water tank 16 is controlled to be constant.

  The controller 21 controls the operation of the pump 19 using the power line B indicated by a broken line. The controller 21 controls the operation of the electronic expansion valve 5 using the power line C. Based on the temperature detection signal A, the controller 21 performs on / off control (open / close control) of the electromagnetic valve 10 using the power line D. The controller 21 controls the operation of the fan 13 using the power line E.

  Next, an operation example of the cooling system 50 that is the above-described inverter-type cooling water circulation device will be described.

  The inverter type refrigerator 1 shown in FIG. 1 performs refrigerant compression, and the compressed refrigerant discharged from the inverter type refrigerator 1 is sent to the refrigerant line 3t of the condenser 3 through the high pressure refrigeration pipe 2. It is liquefied and condensed in the condenser 3.

  The liquefied and condensed refrigerant is sent to the electronic expansion valve 5 through the high-pressure refrigeration pipe 4 and is expanded by the electronic expansion valve 5. When the expanded refrigerant is sent to the refrigerant pipe 7 a of the evaporator 7 serving as a cooler via the low-pressure refrigeration pipe 6, the refrigerant is evaporated and evaporated in the evaporator 7, whereby the refrigerant and the evaporator 7 Heat exchange is performed with the circulating water WT passing through the pipe line 7b. The heat-exchanged refrigerant is returned to the inverter refrigerator 1 via the low-pressure refrigeration pipe 8.

  On the other hand, in the cooling water circulation path 80 shown in FIG. 1, when the pump 22 operates according to a command from the controller 21, the circulating water WT returned from the external circulation return connection portion 90 passes through the circulating water return pipe 14 and the pipe of the evaporator 7. Pass through the road 7b. Thus, when the circulating water WT passes through the circulating water return pipe 14 and passes through the pipe line 7b of the evaporator 7, the circulating water WT is cooled by exchanging heat with the refrigerant passing through the pipe line 7a. It is accommodated in a water tank 16 through a water return pipe 15.

  The circulating water WT in the water tank 16 is maintained at a certain temperature, and the circulating water WT in the water tank 16 passes through the circulating water discharge pipe 18, the pump 19, and the circulating water discharge pipe 20 to the external circulation discharge connection portion 91. To the device that requires cooling of the external heat source.

  The temperature of the circulating water WT in the water tank 16 is preferably set in the range of −20 ° C. to + 80 ° C., and particularly preferably in the range of + 5 ° C. to + 30 ° C. As the circulating water WT, for example, an antifreeze liquid can be used.

  In the cooling system 50 according to the first embodiment of the present invention shown in FIGS. 1 and 2, the circulating water WT is obtained by controlling the output of the inverter refrigerator 1 according to the load amount of the heat source at the external connection destination. Precise control can be performed at a constant temperature.

  FIG. 3 is a graph showing an example of a range in which the circulating water WT can be precisely controlled to a constant temperature in the inverter-type cooling system 50 shown in FIG. In the graph shown in FIG. 3, the vertical axis represents the circulating fluid cooling capacity (W), and the horizontal axis represents the inverter frequency (Hz) of the inverter refrigerator 1 during operation.

  The heat source at the external connection destination is connected to the external circulation return connection part 90 and the external circulation discharge connection part 91. As illustrated in FIG. 3, the value of the heat load of the heat source at the external connection destination is cooling capacity “a” W (watts) (cooling capacity at the maximum output of the refrigerator 1) to cooling capacity “b” W. In the range of (watts) (cooling capacity at the time of the output of the refrigerator 1), the controller 21 in FIG. 1 changes the state of the electromagnetic valve 10 shown in FIGS. 1 and 2 to the “closed” state (off state). ).

  The range of the cooling capacity “a” W (watts) to the cooling capacity “b” W (watts) is referred to as a first cooling capacity range RH1.

  In the numerical example shown in FIG. 3, the cooling capacity “a” W is 2500 W, and the cooling capacity “b” W is 900 W.

  On the other hand, when the value of the heat load of the heat source at the external connection destination is equal to or less than the cooling capacity “b” W (watts) (cooling capacity when the output of the refrigerator 1 is minimum), as illustrated in FIG. The controller 21 shown in FIG. 1 monitors the temperature of the circulating water WT in the water tank 16 based on the temperature detection signal A, and when the target temperature falls below a predetermined threshold value α ° C., FIG. The controller 21 changes the state of the solenoid valve 10 shown in FIGS. 1 and 2 from the “closed” state (off state) to the “open” state (on state). That is, the electromagnetic valve 10 is opened.

  Thus, by opening the solenoid valve 10 shown in FIGS. 1 and 2, a part of the refrigerant flowing through the high-pressure refrigeration pipe 4 flows to the bypass refrigeration pipe 9 side of the bypass circuit 40. Thereby, the refrigerant | coolant amount which flows into the refrigerant pipe line 7a of the evaporator 7 shown in FIG. 1 reduces.

  As a result, the cooling capacity generated in the evaporator 7 is, as shown in FIG. 3, the cooling capacity “c” W (the cooling capacity when the solenoid valve 10 is “open” and the output of the refrigerator 1 is maximum) to Precise temperature control is possible within the range of the cooling capacity “d” W (the cooling capacity when the solenoid valve 10 is “closed” and the output of the refrigerator 1 is minimum). The range of the cooling capacity “c” W to the cooling capacity “d” W is referred to as a second cooling capacity range RH2.

  In the numerical example shown in FIG. 3, the cooling capacity “c” W is 1000 W, and the cooling capacity “d” W is 100 W.

  In the control of the solenoid valve 10 in the “open” state (on state), when the heat load of the heat source at the external connection destination increases and exceeds the cooling capacity “c” W, the controller 21 Based on the detection signal A, the controller 21 detects an increase in the temperature of the circulating water WT in the water tank 16 and when the temperature becomes equal to or higher than a predetermined threshold value β ° C. with respect to a predetermined target temperature, the controller 21 The valve 10 is again set to the “closed” state (off state), and the bypass circuit 40 is closed.

  By the way, as illustrated in FIG. 3, in the range in which the circulating water WT can be precisely controlled to a constant temperature, the cooling capacity “c” W in the second cooling capacity range RH2 is the same as that in the first cooling capacity range RH1. The cooling capacity “b” is set larger than W. That is, the range of the cooling capacity “a” W to the cooling capacity “b” W in the first cooling capacity range RH1 is the cooling capacity “c” W to the cooling capacity “d” W in the second cooling capacity range RH2. It is set so that a part of the range overlaps.

  Thus, by overlapping a part of the first cooling capacity range RH1 and the second cooling capacity range RH2, in the cooling system 50 shown in FIG. 1, the controller 21 “opens” the electromagnetic valve 10. Even if switching control is performed between the state (on state) and the “closed” state (off state), the circulating water WT is within the range of the cooling capacity “a” W to the cooling capacity “d” W, and the circulating water WT The temperature can be precisely controlled.

  In this way, the controller 21 performs switching control of the solenoid valve 10 of the bypass circuit 40 between the “open” state (on state) and the “closed” state (off state), so that external connection that has been impossible in the past has been impossible. Even when the heat load of the previous heat source is reduced to a certain amount or less (for example, the cooling capacity bW or less), the first cooling capacity range RH1 and the first cooling capacity range RH1 are different from each other. Since the cooling capacity range RH2 of 2 is set, the temperature of the circulating water WT can be precisely controlled.

  Thus, preferably, the temperature of the circulating water WT, which is a liquid, is “a” W to cooling capacity “b” W that is the first cooling capacity range RH1, and the second cooling capacity range RH2. Since “c” W to cooling capacity “d” W are set so as to partially overlap, the temperature of the circulating water WT can be precisely controlled continuously without a break.

  Incidentally, the inner diameter and length of the capillary tube 11 of the bypass circuit 40 shown in FIGS. 1 and 2 are determined so that the cooling capacity “b” W ≦ the cooling capacity “c” W as described above. Accordingly, the first cooling capacity range RH1 and the second cooling capacity range RH2 can be set so as to partially overlap.

  As described above, the cooling system 50 according to the first embodiment of the present invention is not limited to the case where the load amount of the heat source at the external connection destination exceeds a certain amount (for example, the cooling capacity bW). Even when the load amount is a certain amount or less (for example, cooling capacity bW or less), precise temperature control of the circulating fluid such as circulating water is possible.

  Next, a second embodiment and a third embodiment of the present invention will be described. When the location of the second embodiment and the third embodiment of the present invention is the same as the corresponding location of the first embodiment, the same reference numerals are used and the description is used.

Second Embodiment
FIG. 4 shows a cooling system 50A that is an inverter-type cooling water circulation device according to the second embodiment of the present invention.

  In the cooling system 50 shown in FIG. 1, the controller 21 controls the operation of the electronic expansion valve 5.

  On the other hand, in the cooling system 50 </ b> A that is the inverter-type coolant circulation device of the second embodiment shown in FIG. 4, a mechanical expansion valve 5 </ b> B is used instead of the electronic expansion valve 5. When this mechanical expansion valve 5B is used, unlike the case shown in FIG. 1, the power line C is not provided. Instead, a can temperature cylinder 59 is provided at a position in the middle of the low-pressure refrigeration pipe 8. Is provided.

  This can temperature cylinder 59 is installed in the vicinity of the low-pressure refrigeration pipe 8, detects the temperature of the surface of the low-pressure refrigeration pipe 8 as a gas pressure, and transmits the pressure value to the mechanical expansion valve 5B with a capillary.

  The can temperature cylinder 59 adjusts the opening of the mechanical expansion valve 5B by detecting the temperature of the refrigerant passing from the evaporator 7 through the low-pressure refrigeration pipe 8 to the refrigerator 1 as a gas pressure. The can temperature cylinder 59 has a structure in which a dedicated gas is sealed and is connected to the mechanical expansion valve 5B by a capillary tube. The temperature of the can temperature cylinder 59 is detected and the opening of the expansion valve 5B is mechanically detected. Make adjustments.

  In the cooling system 50A of the second embodiment of the present invention, similarly to the cooling system 50 of the first embodiment of the present invention, the temperature of the circulating water WT, which is a liquid, is within the first cooling capacity range RH1 “a The range of “W” to the cooling capacity “b” W and the range of “c” W to the cooling capacity “d” W, which is the second cooling capacity range RH2, are set so as to partially overlap, It can be controlled continuously and precisely without any breaks.

  Therefore, in the cooling system 50A, not only when the load amount of the external connection destination exceeds a certain amount (for example, cooling capacity bW), but also when the load amount of the external connection destination is a certain amount or less (for example, cooling capacity bW or less). Even so, precise temperature control of the circulating fluid such as the circulating water WT is possible.

<Third Embodiment>
FIG. 5 shows a cooling system 50B which is an inverter type cooling water circulation device according to a third embodiment of the present invention.

  In the cooling system 50 shown in FIG. 1, the bypass circuit 40 connects the high-pressure refrigeration pipe 4 to the low-pressure refrigeration pipe 8 and bypasses the refrigerant to bypass the bypass refrigeration pipe 9, the bypass refrigeration pipe 12, and the bypass refrigeration pipe 9. An electromagnetic valve 10 and a capillary tube 11 are disposed between the bypass refrigeration pipe 12.

  In contrast, the cooling system 50B shown in FIG. 5 uses another bypass circuit 40A in place of the bypass circuit 40. The bypass circuit 40 </ b> A includes a bypass refrigeration pipe 9 and an opening / closing operation unit 77 disposed in the bypass refrigeration pipe 9. Based on the temperature detection signal A, the controller 21 sends a control signal to the opening / closing operation unit 77 using the signal line DR. Thereby, when the opening / closing operation part 77 is opened, the refrigerant can be passed through the bypass refrigeration pipe 9 of the bypass circuit 40A, and when the opening / closing operation part 77 is closed, the refrigerant is not passed through the bypass refrigeration pipe 9 of the bypass circuit 40A.

  Also in the cooling system 50B, the temperature of the circulating water WT can be continuously and precisely controlled without a break in the range of the cooling capacity “a” W to the cooling capacity “d” W shown in FIG. That is, the temperature of the circulating water WT, which is a liquid, is “a” W to a cooling capacity “b” W that is the first cooling capacity range RH1, and “c” that is the second cooling capacity range RH2. The range of W to the cooling capacity “d” W can be precisely controlled continuously without a break. The cooling system 50B is of course not only when the load amount of the external connection destination exceeds a certain amount (for example, cooling capacity bW), but also when the load amount of the external connection destination is a certain amount or less (for example, cooling capacity bW or less). However, precise temperature control of the circulating fluid such as the circulating water WT is possible.

  As described above, the cooling system 50 (50A, 50B) of the embodiment of the present invention includes the tank 16 that contains the circulating liquid, the inverter refrigerator 1 that passes the refrigerant, the condenser 3, the expansion valve 5, and the evaporator 7. And a refrigerator circuit 51 that cools the circulating fluid sent from the heat source by passing it through the evaporator 7.

  The refrigerant is passed through the refrigerator circuit 51 from the high-pressure refrigeration pipe 4 that connects the condenser 3 and the expansion valve 5 to the low-pressure refrigeration pipe 8 that connects the evaporator 7 and the inverter-type refrigerator 1. A bypass circuit 40 for adjusting the flow rate of the refrigerant flowing to the side is provided. A range RH1 of the first cooling capacity of the refrigerator circuit 51 when the bypass circuit 40 is closed and a range RH2 of the second cooling capacity of the refrigerator circuit 51 when the bypass circuit is opened are set. Yes.

  Thus, the cooling system is in the first cooling capacity range RH1 when the load amount of the heat source at the external connection destination exceeds a certain amount, and when the load amount of the heat source at the external connection destination is not more than a certain amount. Is in the second cooling capacity range RH2, and precise temperature control of the circulating fluid such as the circulating water WT is possible.

  Since the expansion valve 5 is an electronic expansion valve that controls the flow rate of the refrigerant by adjusting the opening degree based on the temperature of the circulating fluid in the tank 16, the cooling system has a first cooling capacity range RH1. In the second cooling capacity range RH2, precise temperature control of the circulating fluid such as the circulating water WT is possible.

  The expansion valve 5B is a mechanical expansion valve that controls the flow rate of the refrigerant by being adjusted based on the temperature of the refrigerant sent from the evaporator 7 to the inverter-type refrigerator 1 through the low-pressure refrigeration pipe 8. The system enables precise temperature control of the circulating fluid such as the circulating water WT in the first cooling capacity range RH1 and the second cooling capacity range RH2.

  The bypass circuit 40A is provided with a refrigerant opening / closing operation unit 77. The opening / closing operation unit 77 performs opening / closing in the bypass circuit 40A based on the temperature of the circulating fluid in the tank 16, so that the cooling system Precise temperature control of the circulating fluid such as the circulating water WT is possible within the range RH1 of the first cooling capacity and the range RH2 of the second cooling capacity.

  The bypass circuit 40A shown in FIG. 5 includes a bypass refrigeration pipe 9 that connects the high-pressure refrigeration pipe 4 and the low-pressure refrigeration pipe 8, and an opening / closing operation unit 77. The range of the first cooling capacity RH1 of the refrigerator circuit when the opening / closing operation section 77 of the bypass circuit 40A is closed and the second cooling capacity of the refrigerator circuit when the opening / closing operation section 77 of the bypass circuit 40A is opened. The range RH2 is set to partially overlap.

  Thus, when the opening / closing operation unit 77 is closed and set to the first cooling capacity range RH1, and when the opening / closing operation unit 77 is opened and set to the second cooling capacity range RH2, the temperature of the circulating fluid is In the range RH1 of the first cooling capacity and the range RH2 of the second cooling capacity, it is possible to control precisely and continuously without a break.

  A cooling liquid circulation path 80 for circulating the circulating liquid from the heat source into the tank 16 is provided, and the circulating liquid passing through the cooling liquid circulation path 80 exchanges heat with the refrigerant in the evaporator 7 of the refrigerator circuit 51. To be cooled. Thereby, the circulating fluid circulated in the tank 16 can be cooled by exchanging heat in the evaporator 7 by passing through the coolant circulation path 80.

  The present invention has been described with reference to the embodiments. However, each embodiment is an example, and the scope of the invention described in the claims can be variously modified without departing from the scope of the invention. .

  For example, in each embodiment of the present invention, the liquid is exemplified as circulating water, but is not limited to the type of liquid.

DESCRIPTION OF SYMBOLS 1 Inverter type refrigerator 2 High pressure refrigeration piping 3 Condenser 4 High pressure refrigeration piping 5 Expansion valve 6 Low pressure refrigeration piping 7 Evaporator 8 Low pressure refrigeration piping 9 Bypass refrigeration piping 10 Solenoid valve 11 Capillary tube 12 Bypass refrigeration piping 13 Fan 14 Circulating water return Piping (Example of circulating fluid return piping)
15 Circulating water return piping (Example of circulating fluid return piping)
16 Water tank (example of tank)
17 Temperature sensor 18 Circulating water discharge piping (Circulating fluid discharge piping)
19 Pump 20 Circulating water discharge piping (Circulating fluid discharge piping)
21 Controller (control unit)
DESCRIPTION OF SYMBOLS 50 Cooling system 50A Cooling system 50B Cooling system 51 Inverter type refrigerator circuit 77 Opening / closing operation part 80 Cooling water circulation path (coolant circulation path)
WT Circulating water (circulating fluid)
RH1 First cooling capacity range RH2 Second cooling capacity range

Claims (6)

A tank containing the circulating fluid;
An inverter-type refrigerator that passes refrigerant, a condenser, an expansion valve, and an evaporator, and a refrigerator circuit that cools the circulating liquid sent from a heat source by passing through the evaporator,
The refrigerant is passed through the refrigerator circuit from the high-pressure refrigeration pipe connecting the condenser and the expansion valve to the low-pressure refrigeration pipe connecting the evaporator and the inverter-type refrigerator to the expansion valve side. A bypass circuit is provided to change the flow rate of the refrigerant to flow;
The range of the first cooling capacity of the refrigerator circuit when the bypass circuit is closed and the range of the second cooling capacity of the refrigerator circuit when the bypass circuit is opened are set. A cooling system featuring.   The cooling according to claim 1, wherein the expansion valve is an electronic expansion valve that controls the flow rate of the refrigerant by adjusting an opening degree based on a temperature of the circulating fluid in the tank. system.   The expansion valve is a mechanical expansion valve that controls the flow rate of the refrigerant by being adjusted based on the temperature of the refrigerant sent from the evaporator to the inverter refrigerator through the low-pressure refrigeration pipe. The cooling system according to claim 1.   The bypass circuit is provided with an opening / closing operation part for the refrigerant, and the opening / closing operation part opens and closes the bypass circuit based on a temperature of the circulating fluid in the tank. 2. The cooling system according to 1. The bypass circuit includes a bypass refrigeration pipe connecting the high-pressure refrigeration pipe and the low-pressure refrigeration pipe, an electromagnetic valve and a capillary tube provided in the middle of the bypass refrigeration pipe,
Range of the first cooling capacity of the refrigerator circuit when the solenoid valve of the bypass circuit is closed, and the second cooling capacity of the refrigerator circuit when the solenoid valve of the bypass circuit is opened The cooling system according to claim 2 or 3, wherein the range is set so as to partially overlap.   A coolant circulation path for circulating the circulating fluid from the heat generation source into the tank, and the circulating fluid passing through the coolant circulation path exchanges heat with the refrigerant in the evaporator of the refrigerator circuit; The cooling system according to claim 1, wherein the cooling system is cooled by performing.

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