JP2009063220A - Temperature adjusting device for cooling water - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a temperature adjusting device capable of easily precisely adjusting a temperature of cooling water by continuing an operation of a compressor even in a state that an inverter keeps a rotational frequency of the compressor at a prescribed rotational frequency. <P>SOLUTION: In this temperature adjusting device of cooling water comprising the compressor 10, a first heat exchanger 12 and a second heat exchanger 14 exchanging heat between a cold medium and the cooling water, a control portion 30 is disposed to control a first control valve 28a disposed in the first bypass pipe 26a and a second control valve 28b disposed in the second bypass pipe 26b, so that in a cooling cycle, the cold medium divided to a first bypass pipe 26a without cooled, of the cold medium compressed by the compressor 10 is mixed with the cooled cold medium to adjust a temperature of the cold medium supplied to the second heat exchanger 14, and in a heating cycle, a part of the cold medium compressed by the compressor 10 is divided to the second bypass pipe 26b and bypasses the second heat exchanger 14 to adjust the amount of cold medium supplied to the second heat exchanger 14. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a cooling water temperature adjusting device, and more particularly to a cooling water temperature adjusting device that adjusts the temperature of cooling water used in an industrial machine or the like to a predetermined temperature.

As a temperature adjustment device for cooling water that cools LSIs of large computers that are widely used as industrial machines, a temperature adjustment device shown in FIG. 7 is proposed in Patent Document 1 below.
The temperature adjustment device shown in FIG. 7 is used as a temperature adjustment device for an LSI mounted in a room 102 that is air-conditioned by an air conditioner 100.
In such a temperature adjusting device, as shown in FIG. 7A, a cooling water flow path 104 provided with a pump 103 for circulating cooling water for cooling an LSI, a compressor 106 for compressing a cooling medium, a cooling medium and a room The first heat exchanger 108 that performs heat exchange with the air 102 and the cooling medium flow path 114 provided with the expansion valve 110 and the four-way valve 112 are arranged so as to be able to exchange heat via the second heat exchanger 116. To form a heat pump cycle.
Further, the compressor 106 is provided with an inverter 118 that controls the rotation speed of the compressor 106. The inverter 118 controls the rotational speed of the compressor 106 based on the cooling water temperature measured by the temperature sensor 120 provided on the outlet side of the second heat exchanger 116 in the cooling water flow path 104, and 2 Cooling water temperature on the outlet side of the heat exchanger 116 is maintained at a predetermined value.
Japanese Patent Laid-Open No. 63-176656

In the second heat exchanger 116, the four-way valve 112 shown in FIG. 7A can be switched between a heating cycle circuit side for heating the cooling water and a cooling cycle circuit side for cooling the cooling water.
At the position of the four-way valve 112 shown in FIG. 7A, the position is switched to the heating cycle circuit side for heating the cooling water. On the heating cycle circuit side, the cooling medium compressed by the compressor 106 is supplied to the second heat exchanger 116 to heat the cooling water. In this way, the cooling medium that has dissipated heat by heating the cooling water in the second heat exchanger 116 is expanded and cooled in an adiabatic manner by the expansion valve 110, and then heat-exchanged with room air in the first heat exchanger 108. Then, after the temperature is raised, it is supplied again to the compressor 106.
When the cooling water temperature measured by the temperature sensor 120 in the cooling water flow path 104 becomes higher than the set value, as shown in FIG. 7B, the cooling cycle circuit side that cools the cooling water by the four-way valve 112 Can be switched to.
7B, on the cooling cycle circuit side for cooling the cooling water, the cooling medium compressed by the compressor 106 is radiated and cooled by the first heat exchanger 108, and then expanded adiabatically by the expansion valve 110. After further cooling, it is supplied to the second heat exchanger 116 to cool the cooling water. The cooling medium heated by cooling the cooling water is compressed again by the compressor 106.

In the temperature adjusting device shown in FIG. 7, the temperature sensor 120 provided on the outlet side of the second heat exchanger 116 in the cooling water flow path 104 also on the heating cycle circuit side or the cooling cycle circuit side switched by the four-way valve 112. The inverter 118 controls the rotation speed of the compressor 106 based on the cooling water temperature measured in step 1, and can maintain the cooling water temperature on the outlet side of the second heat exchanger 116 in the cooling water channel 104 at a predetermined value.
By the way, as shown in FIG. 8, the control of the rotation speed of the compressor 106 by the inverter 118 is performed using the cooling water temperature measured by the temperature sensor 120 provided on the outlet side of the second heat exchanger 116 in the cooling water flow path 104. Control is performed so that the rotational speed of the compressor 106 decreases as the temperature difference from the set temperature becomes smaller.
However, when the rotational speed of the compressor 106 is reduced to a predetermined rotational speed, the inverter 118 sets the rotational speed of the compressor 106 to the predetermined rotational speed even if the temperature difference between the temperature measured by the temperature sensor 120 and the set temperature is further reduced. To maintain. This is because when the rotational speed of the compressor 106 is decreased below a predetermined rotational speed, the compressor 106 may become unstable.
Therefore, in a state where the rotation speed of the compressor 106 is maintained at a predetermined rotation speed (shaded area shown in FIG. 8), the temperature of the cooling water cannot be adjusted by changing the rotation speed of the compressor 106, and the precise temperature of the cooling water It cannot be adjusted.
For this reason, in order to adjust the temperature of the cooling water at the shaded portion shown in FIG. 8, it is conceivable to control the compressor 106 on and off based on the temperature difference between the temperature measured by the temperature sensor 120 and the set temperature.
However, frequently turning on and off the compressor 106 is a problem in terms of maintenance of the compressor 106, and the fluctuation given to the system is large.

Further, as shown in FIG. 9, by providing the auxiliary heater 200 in the cooling water flow path 104, it is possible to precisely adjust the temperature of the cooling water.
That is, when the cooling water is switched to the cooling cycle circuit side and the rotation speed of the compressor 106 is maintained at a predetermined rotation speed (the hatched portion on the cooling side shown in FIG. 8), the temperature of the cooling water is adjusted. For this purpose, excess cooling heat added to the cooling water by the compressor 106 rotating at a predetermined number of revolutions can be removed by heating the auxiliary heater 200, and the cooling water can be brought close to the set temperature.
On the other hand, when the cooling water is switched to the heating cycle circuit side and the rotation speed of the compressor 106 is maintained at a predetermined rotation speed (the hatched portion on the cooling side shown in FIG. 8), the temperature of the cooling water is adjusted. In this case, the cooling water can be brought close to the set temperature by stopping the compressor 106 and supplementing the insufficient amount of heat with the auxiliary heater 200.
However, as shown in FIG. 9, there is still a concern that the system may become unstable due to ON / OFF of the compressor 106 even in the temperature adjusting device provided with the auxiliary heater 200, and the cooling water is heated while being cooled. From the viewpoint of energy saving, it is not preferable.
Therefore, the problem of the present invention is that when the rotation speed of the compressor is reduced to a predetermined rotation speed, the inverter maintains the rotation speed of the compressor at the predetermined rotation speed, and the precise temperature of the cooling water is adjusted by adjusting the rotation speed of the compressor. Solves the problem of the conventional cooling water temperature control device, which is difficult to control, and reduces the compressor speed even when the compressor speed is reduced to the specified speed and the inverter maintains the compressor speed at the specified speed. It is an object of the present invention to provide a temperature adjusting device that can easily perform precise temperature adjustment of cooling water by continuing the operation of the machine and can save energy.

As a result of studying to solve the above-mentioned problems, the present inventors are on the side of the cooling water heating cycle circuit shown in FIG. 7A, and the inverter maintains the rotation speed of the compressor at a predetermined rotation speed. In the case (when located in the shaded portion on the heating side shown in FIG. 8), the second heat exchanger 116 bypasses a part of the cooling medium compressed by the compressor 106 to generate the second heat. It has been found that the supply amount of the cooling medium supplied to the exchanger 116 can be adjusted.
Further, in the cooling cycle circuit side of the cooling water shown in FIG. 7B, when the inverter maintains the rotation speed of the compressor at a predetermined rotation speed (located in the hatched portion on the cooling side shown in FIG. 8). A portion of the cooling medium compressed by the compressor 106 bypasses the first heat exchanger 108 and the expansion valve 110 and passes through the first heat exchanger 108 and the expansion valve 110. Knowing that the temperature of the cooling medium supplied to the second heat exchanger 116 can be adjusted by mixing with the cooled cooling medium, the present invention has been achieved.

That is, the present invention includes a compressor that compresses a cooling medium, a first heat exchanger that heats or cools the cooling medium, a second heat exchanger that performs heat exchange between the cooling medium and cooling water, An expansion valve that adiabatically expands the cooling medium, and the rotational speed of the compressor is controlled based on a temperature difference between the temperature of the cooling water and a set temperature, and when the rotational speed is reduced to a predetermined rotational speed, An inverter that maintains the rotational speed of the compressor at the predetermined rotational speed, and a cooling medium that has been compressed by the compressor and cooled by the first heat exchanger is adiabatically expanded and cooled by the expansion valve. A cooling cycle circuit for cooling water supplied to the second heat exchanger, and a cooling medium that heats and dissipates the cooling water by the second heat exchanger that is compressed and supplied by the compressor. A cooling water heating cycle circuit that expands and cools and then supplies the temperature to the first heat exchanger to raise the temperature; A cooling water temperature adjusting device provided with a switching four-way valve, the first control valve disposed in a first bypass pipe bypassing the first heat exchanger and the expansion valve, and the second heat exchanger And a second control valve disposed in a second bypass pipe that bypasses the four-way valve, the four-way valve is switched to the cooling cycle circuit side, and the rotational speed of the compressor has reached a predetermined rotational speed. When adjusting the temperature of the cooling water, the cooling medium compressed by the compressor is cooled by passing through the first heat exchanger and the expansion valve. The temperature of the cooling medium supplied to the second heat exchanger is adjusted by mixing with another cooling medium, the four-way valve is switched to the heating cycle circuit side, and the rotational speed of the compressor is a predetermined rotational speed. The temperature of the cooling water is adjusted when the temperature reaches The first control valve so that a part of the cooling medium compressed by the compressor is diverted to the second bypass pipe and the amount of the cooling medium supplied to the second heat exchanger is adjusted. And the control part which controls the opening degree of a 2nd control valve based on the temperature difference of the temperature of cooling water and preset temperature is provided in the temperature control apparatus of the cooling water characterized by the above-mentioned.
In the present invention, the operation of the temperature adjustment device can be stabilized by using the second bypass pipe as a bypass pipe that bypasses the second heat exchanger and the expansion valve.

  The present invention also includes a compressor that compresses the cooling medium, a first heat exchanger that heats or cools the cooling medium, a second heat exchanger that performs heat exchange between the cooling medium and cooling water, An expansion valve that adiabatically expands the cooling medium, and the rotational speed of the compressor is controlled based on a temperature difference between the temperature of the cooling water and a set temperature, and when the rotational speed is reduced to a predetermined rotational speed, An inverter that maintains the rotational speed of the compressor at the predetermined rotational speed, and a cooling medium that has been compressed by the compressor and cooled by the first heat exchanger is adiabatically expanded and cooled by the expansion valve. A cooling cycle circuit for cooling water supplied to the second heat exchanger, and a cooling medium that heats and dissipates the cooling water by the second heat exchanger that is compressed and supplied by the compressor. Turn off the cooling water heating cycle circuit that expands and cools, then supplies to the first heat exchanger and heats up A cooling water temperature adjusting device provided with a four-way valve to be replaced, wherein a first control valve is disposed in a first bypass pipe that bypasses the first heat exchanger and the expansion valve, and the four-way valve is cooled. When the temperature of the cooling water is adjusted when the rotation speed of the compressor reaches a predetermined rotation speed when switched to the cycle circuit side, the first bypass pipe among the cooling medium compressed by the compressor So that the temperature of the cooling medium supplied to the second heat exchanger is adjusted by mixing the cooling medium divided into the first heat exchanger and the other cooling medium cooled by passing through the expansion valve. When controlling the temperature of the cooling water when the first control valve is controlled and the four-way valve is switched to the heating cycle circuit side and the rotation speed of the compressor reaches a predetermined rotation speed, To switch the valve to the cooling cycle circuit side, It is also the temperature adjustment device of the cooling water, characterized in that the control unit for controlling the heating cycle circuit side of the serial four-way valve on the basis of the switching to the cooling cycle side to the rotational speed of the compressor is provided.

In these inventions, by providing an expansion valve in each of the cooling cycle circuit and the heating cycle circuit, the direction of inflow and outflow of the cooling medium to the expansion valve is constant, and the structure of the expansion valve is simplified. it can.
Moreover, as a 1st heat exchanger, it can also be used as a heat pump which absorbs the temperature of external air by using the heat exchanger provided with the fan which blows external air toward the piping through which a cooling medium passes. it can.
Furthermore, in the first heat exchanger, even if the four-way valve is switched to the heating cycle circuit side or the cooling cycle circuit side, by arranging the piping and the control valve so that the cooling medium is supplied from the same direction, The supply direction of the cooling medium to the first heat exchanger is constant, and the structure of the first heat exchanger can be simplified.

In the cooling water temperature adjusting device (first temperature adjusting device) according to the present invention, when the four-way valve is switched to the cooling water heating cycle circuit side, the inverter maintains the rotation speed of the compressor at a predetermined rotation speed. When the temperature of the cooling water is adjusted in the case where the cooling water is temperature-adjusted (when located in the shaded portion on the heating side shown in FIG. 8), the cooling medium compressed by the compressor passes through the second bypass pipe. By adjusting the amount of the cooling medium that bypasses the second heat exchanger with the second control valve, the supply amount of the cooling medium supplied to the second heat exchanger can be adjusted, and the cooling water that passes through the second heat exchanger Can adjust the temperature.
On the other hand, in the first temperature adjusting device, when the four-way valve is switched to the cooling water cooling cycle circuit side, the inverter maintains the rotational speed of the compressor at a predetermined rotational speed (shown in FIG. 8). The first bypass that bypasses the first heat exchanger and the expansion valve in the cooling medium compressed by the compressor when the temperature of the cooling water is adjusted when the cooling water is temperature-adjusted) The temperature of the cooling medium supplied to the second heat exchanger can be adjusted by mixing the cooling medium divided into the pipe with the cooling medium cooled by passing through the first heat exchanger and the expansion valve.
Further, in the temperature adjustment device (second temperature adjustment device) according to the present invention in which only the first bypass pipe provided with the first control valve is provided, the four-way valve is switched to the cooling water heating cycle circuit side. When the inverter maintains the compressor speed at a predetermined speed (when it is located in the shaded area on the heating side shown in FIG. 8), Of the cooling medium compressed by the compressor and mixed with the cooling medium cooled by passing through the first heat exchanger and the expansion valve. Then, the temperature of the cooling medium supplied to the second heat exchanger is adjusted.
In such a second temperature control device, when the four-way valve is switched to the cooling water cooling cycle circuit side and the inverter maintains the rotational speed of the compressor at a predetermined rotational speed (the diagonal line on the cooling side shown in FIG. 8). When the temperature of the cooling water is adjusted in the case of the first heat exchanger and the expansion valve among the cooling medium compressed by the compressor, as in the case of the first temperature adjustment device. The temperature of the cooling medium supplied to the second heat exchanger is adjusted by mixing the cooling medium divided into the first bypass pipe that bypasses the cooling medium with the cooling medium that has passed through the first heat exchanger and the expansion valve and is cooled. Can be adjusted.
As a result, according to the cooling water temperature adjusting device according to the present invention, even when the cooling water temperature adjusting device is located in the shaded area shown in FIG. It is possible to precisely adjust the cooling water temperature without installing an auxiliary heater or the like, and to save energy.

FIG. 1 shows an outline of a cooling water temperature adjusting device (first temperature adjusting device) according to the present invention. In the cooling water temperature adjusting device shown in FIG. 1, the four-way valve 24 switches to the cooling cycle circuit side. The cooling cycle circuit is provided with a compressor 10 whose rotation speed is controlled by an inverter 18, a first heat exchanger 12, a second heat exchanger 14, and expansion valves 16a and 16b.
The second heat exchanger 14 is supplied with cooling water and a heated or cooled cooling medium, and heat exchange between the cooling medium and the cooling water is performed so that the cooling water is adjusted to a predetermined temperature. The cooling water returned from the user and stored in the storage tank 20 is supplied to the second heat exchanger 14 by the liquid feed pump 22, adjusted to a predetermined temperature, and supplied to the user.
The first heat exchanger 12 is a heat exchanger provided with a fan 12a that blows external air toward a pipe through which a cooling medium passes.
In the first temperature adjusting device shown in FIG. 1, the cooling medium compressed by the compressor 10 and cooled by the first heat exchanger 12 is adiabatically expanded by the expansion valve 16a and cooled, and then the second heat The cooling cycle circuit of the cooling water supplied to the exchanger 14 and the cooling medium that is compressed by the compressor 10 and supplied to the second heat exchanger 14 to heat the cooling water and dissipate the heat are expanded adiabatically by the expansion valve 16b. A four-way valve 24 that switches between a cooling water heating cycle circuit that cools and then supplies the first heat exchanger 12 and raises the temperature is provided. On the downstream side of each of the expansion valves 16a and 16b, check valves 17a and 17b are provided to prevent the cooling medium that has been adiabatically expanded and cooled from flowing backward.

Further, in the cooling water temperature adjusting apparatus shown in FIG. 1, a part of the cooling medium from the compressor 10 is transferred to the first bypass pipe 26a that bypasses the first heat exchanger 12, the expansion valve 16a and the check valve 17a. A first control valve 28a provided, and a second control valve 28b provided in a second bypass pipe 26b that bypasses the second heat exchanger 14, the expansion valve 16b, and the check valve 17b are provided. .
The expansion valves 16 a and 16 b, the inverter 18, the four-way valve 24, the first control valve 28 a and the second control valve 28 b provided in the cooling water temperature adjusting device shown in FIG. 1 are controlled by the control unit 30. Cooling water temperature data measured by a temperature sensor 34 provided in a pipe through which the cooling water whose temperature is adjusted by the second heat exchanger 14 is passed is transmitted to the control unit 30.
The compressor 10 is supplied with a cooling medium stored in the accumulator 32.

In the cooling water temperature adjusting device shown in FIG. 1, the heating load of the user's industrial machine or the like is large, and the cooling water is switched to the cooling cycle circuit side by the four-way valve 24 to cool the cooling water. In this cooling cycle circuit, the cooling medium compressed by the compressor 10 passes through the four-way valve 24 and is cooled by the first heat exchanger 12, and then is adiabatically expanded by the expansion valve 16a and further cooled. It is supplied to the second heat exchanger 14. In the second heat exchanger 14, the cooling medium that has absorbed the heat by cooling the cooling water passes through the four-way valve 24, is temporarily stored in the accumulator 32, and is supplied to the compressor 10.
As shown in FIG. 1, in the temperature adjustment device switched to the cooling cycle circuit side, the control unit 30 is connected via the inverter 18 based on the temperature difference between the temperature data of the cooling water from the temperature sensor 34 and the set temperature. The rotation speed of the compressor 10 is controlled. For this reason, for example, the rotation speed of the compressor 10 is increased as the temperature difference between the temperature data of the cooling water and the set temperature is larger (as the heat load from the user is larger). On the other hand, the smaller the temperature difference between the temperature data of the cooling water and the set temperature (the smaller the heat load from the user), the lower the rotational speed of the compressor 10.
However, when the rotational speed of the compressor 10 decreases to a predetermined rotational speed, the inverter 18 controls the compressor 10 to maintain the rotational speed of the compressor 10 at the predetermined rotational speed, as shown in FIG. As described above, when the temperature of the cooling water is adjusted in a state where the rotation speed of the compressor 10 is maintained at the predetermined rotation speed (when the cooling water is located in the hatched portion on the cooling side shown in FIG. 8), the compressor 10 The number of rotations becomes higher than the necessary number of rotations, and the cooling water is excessively cooled by the second heat exchanger 14.

In this case, the control unit 30 opens the first control valve 28a of the first bypass pipe 26a, adjusts the opening degree, and among the cooling medium compressed by the compressor 10, the cooling medium that is divided into the first bypass pipe 26a. Is mixed with another cooling medium cooled by passing through the first heat exchanger 12 and the expansion valve 16a, and the temperature of the cooling medium supplied to the second heat exchanger 14 is adjusted. For this reason, the cooling water is adjusted to a predetermined temperature without being excessively cooled by the second heat exchanger 14.
On the other hand, when an industrial machine or the like as a user is started in winter, the cooling water for cooling the industrial machine or the like may be too low to be heated. In this case, the four-way valve 24 is switched to the heating cycle circuit side by the switching signal from the control unit 30 as shown in FIG. In this heating cycle circuit, the cooling medium compressed by the compressor 10 is supplied to the second heat exchanger 14 to heat the cooling water to dissipate heat, and then is expanded adiabatically by the expansion valve 16b and cooled. . The cooled cooling medium is supplied to the first heat exchanger 12, and is heated and heated from the indoor air flow blown by the fan 12 a, and then temporarily stored in the accumulator 32 and re-supplied to the compressor 10. The

As shown in FIG. 2, in the temperature adjustment device switched to the heating cycle circuit side, the control unit 30 is connected via the inverter 18 based on the temperature difference between the temperature data of the cooling water from the temperature sensor 34 and the set temperature. The rotation speed of the compressor 10 is controlled. For this reason, for example, the rotational speed of the compressor 10 is increased as the temperature difference between the temperature data of the cooling water and the set temperature is larger (the cooling water from the user is lower in temperature). On the other hand, the smaller the temperature difference between the temperature data of the cooling water and the set temperature (the higher the temperature of the cooling water from the user), the lower the rotational speed of the compressor 10.
However, when the rotational speed of the compressor 10 decreases to a predetermined rotational speed, the inverter 18 controls the compressor 10 to maintain the rotational speed of the compressor 10 at the predetermined rotational speed, as shown in FIG. As described above, when the temperature of the cooling water is adjusted in a state where the rotation speed of the compressor 10 is maintained at the predetermined rotation speed (when the cooling water is positioned in the shaded portion on the heating side shown in FIG. 8), the compressor 10 The number of rotations becomes higher than the necessary number of rotations, and the cooling water is excessively heated in the second heat exchanger 14.
In this case, the control unit 30 opens the second control valve 28b of the second bypass pipe 26a, adjusts the opening degree, and diverts a part of the cooling medium compressed by the compressor 10 to the second bypass pipe 26b. The amount of the cooling medium supplied to the second heat exchanger 14 is adjusted. For this reason, the cooling water is adjusted to a predetermined temperature without being excessively heated by the second heat exchanger 14.
The cooling medium that has passed through the second bypass pipe 26b is condensed after passing through the second heat exchanger 14 and is condensed through the expansion valve 16b and the check valve 17b to be adiabatically expanded and merged. Then, after being supplied to the first heat exchanger 12 and absorbing heat from the indoor air flow blown by the fan 12a, the temperature is raised and then temporarily stored in the accumulator 32 and re-supplied to the compressor 10.

As described above, in the temperature control apparatus shown in FIGS. 1 and 2, in the cooling cycle circuit side and the heating cycle side circuit, the region where the rotation speed of the compressor 10 decreases to the predetermined rotation speed and is maintained at the predetermined rotation speed. Even inside (within the shaded area shown in FIG. 8), the compressor 10 can be continuously operated to adjust the temperature of the cooling water. For this reason, the system fluctuation | variation accompanying ON-OFF of the compressor 10 can be eliminated from the viewpoint of the maintenance of the compressor 10 as well.
In addition, since it is not necessary to use a preheater or the like for adjusting the temperature of the cooling water in the shaded area shown in FIG. 8, energy saving can be achieved.
By the way, in the temperature control apparatus shown in FIG.1 and FIG.2, the supply direction of the cooling medium to the 1st heat exchanger 12 is reversed in the cooling cycle circuit side and the heating cycle circuit side. For this reason, when the structure of the first heat exchanger 12 is complicated, as shown in FIG. 3, the first heat exchanger 12 includes a four-way valve 24 and a heating cycle circuit side and a cooling cycle circuit side. It is preferable to arrange the piping and the control valve so that the cooling medium is supplied from the same direction even if the operation is switched.

The pipe 36 from the four-way valve 24, the expansion valve 16b, and the check valve are arranged on one side of the first heat exchanger 12 so that one side of the first heat exchanger 12 shown in FIG. The piping 36 from 17b is connected. The first bypass pipe 26a is connected to the pipe 36, and a control valve 42 is provided.
In addition, a pipe 40 is provided to connect the other side of the first heat exchanger 12 to the expansion valve 16a and the check valve 17a so that the other side of the first heat exchanger 12 becomes the outlet side of the cooling medium. ing.
Furthermore, a pipe 44 that connects the pipe 40 and the pipe 36 is provided, and a control valve 46 is provided in the middle of the pipe 44. The pipe 44 is connected between the control valve 42 and the first bypass pipe 26a.
As shown in FIG. 3, when the four-way valve 24 is switched to the heating cycle circuit side, the cooling medium that has passed through the expansion valve 16 b and the check valve 17 b is closed by closing the control valve 42 and opening the control valve 46. , Is supplied from one side of the first heat exchanger 12 and flows out from the other side.
On the other hand, when the four-way valve 24 is switched to the cooling cycle circuit side, the cooling medium that has passed through the four-way valve 24 is opened on one side of the first heat exchanger 12 by opening the control valve 42 and closing the control valve 46. From the other side.
As described above, in the temperature adjusting device shown in FIG. 3, even if the four-way valve 24 is switched to the cooling cycle circuit side or the heating cycle circuit side, the supply / outflow direction of the cooling medium to the first heat exchanger 12 is constant. can do.

1 to 3 described above, the first bypass pipe 26a provided with the first control valve 28a and the second bypass pipe 26b provided with the second control valve 28b are provided. Although provided, only the first bypass pipe 26a provided with the first control valve 28a may be provided as in the temperature control device shown in FIGS.
The configuration of the temperature adjusting device shown in FIGS. 4 and 5 is different from the temperature adjusting device shown in FIGS. 1 to 3 in that the second bypass pipe 26b provided with the second control valve 28b is not provided. Since they are only different, the same members as those of the temperature adjusting device shown in FIGS. 4 and 5 are designated by the same reference numerals, and detailed description thereof is omitted.
Further, in the temperature adjusting device shown in FIG. 4, the four-way valve 24 is switched to the cooling cycle circuit side, and its operation is similar to that of the temperature adjusting device shown in FIG. Based on the temperature difference from the set temperature, the control unit 30 controls the rotational speed of the compressor 10 via the inverter 18. For this reason, for example, the rotation speed of the compressor 10 is increased as the temperature difference between the temperature data of the cooling water and the set temperature is larger (as the heat load from the user is larger). On the other hand, the smaller the temperature difference between the temperature data of the cooling water and the set temperature (the smaller the heat load from the user), the lower the rotational speed of the compressor 10.
On the other hand, when the rotational speed of the compressor 10 is reduced to a predetermined rotational speed and the temperature of the cooling water is adjusted in a state where the rotational speed of the compressor 10 is maintained at the predetermined rotational speed as shown in FIG. 8), the control unit 30 opens the first control valve 28a of the first bypass pipe 26a, adjusts the opening degree, and the cooling medium compressed by the compressor 10 Among them, the cooling medium that has been divided into the first bypass pipe 26a is mixed with the other cooling medium that has been cooled by passing through the first heat exchanger 12 and the expansion valve 16a, and is supplied to the second heat exchanger 14. Adjust the temperature of the medium. For this reason, the cooling water is adjusted to a predetermined temperature without being excessively cooled by the second heat exchanger 14.

On the other hand, as shown in FIG. 5, when the four-way valve 24 is switched to the heating cycle circuit side, the rotational speed of the compressor 10 is reduced to a predetermined rotational speed, and the rotational speed of the compressor 10 is set to the predetermined rotational speed. In the case where the temperature of the cooling water is adjusted in a state where it is maintained (when it is located in the shaded portion on the heating side shown in FIG. 8), the temperature adjusting device shown in FIG. Absent. For this reason, the control unit 30 issues a switching signal for switching the four-way valve 24 to the cooling cycle circuit side.
As described above, even with the temperature adjusting device in the state shown in FIG. 4 in which the four-way valve 24 is switched to the cooling cycle circuit side, the cooling water can be heated (in the case of the left portion of the one-dot chain line shown in FIG. 6). ). In this case, the 1st control valve 28a arrange | positioned at the 1st bypass piping 26a is opened, and the 1st heat exchanger removes the cooling medium which shunted to the 1st bypass piping 26a among the cooling media discharged from the compressor 10. 12 and the other cooling medium cooled by passing through the expansion valve 16 a and adjusting the temperature of the cooling medium supplied to the second heat exchanger 14. At this time, by adjusting the opening degree of the first control valve 28a of the first bypass pipe 26a, the temperature of the cooling medium supplied to the second heat exchanger 14 is a temperature at which the cooling water is not excessively heated. Can be adjusted.
In the case of the portion on the right side of the alternate long and short dash line shown in FIG. 6, the temperature of the cooling medium supplied to the second heat exchanger 14 is adjusted by adjusting the opening of the first control valve 28a of the first bypass pipe 26a. Can be adjusted to a temperature at which the cooling water is not excessively cooled.

In the temperature adjusting device shown in FIGS. 1 to 5 described above, the expansion valves 16a and 16b are provided in each of the cooling cycle circuit and the heating cycle circuit. However, like the temperature adjusting device shown in FIG. One expansion valve that can be shared by both circuits may be provided. However, in this case, since the cooling medium supply direction to the expansion valve is reversed between the cooling cycle circuit and the heating cycle circuit, it is important to use an expansion valve whose flow resistance does not differ depending on the supply direction of the cooling medium. It is.
Moreover, in the temperature control apparatus shown in FIGS. 1-5, although the heat exchanger provided with the fan 12a which blows external air toward the piping through which a cooling medium passes is used as the 1st heat exchanger 12, it is You may use the heat exchanger of the system which surrounds piping which a medium passes with other liquid media, such as water.

It is an example of the temperature control apparatus of the cooling water which concerns on this invention, Comprising: It is the schematic for demonstrating the state switched to the cooling cycle circuit side. It is the schematic for demonstrating the state by which the temperature adjustment apparatus of the cooling water shown in FIG. 1 is switched to the heating cycle circuit side. FIG. 3 is a schematic diagram for explaining a state in which the cooling water temperature adjusting device shown in FIGS. 1 and 2 is improved and switched to the heating cycle circuit side. It is the schematic for demonstrating the state switched to the cooling cycle circuit side which is another example of the temperature control apparatus of the cooling water which concerns on this invention. It is the schematic for demonstrating the state by which the temperature adjustment apparatus of the cooling water shown in FIG. 4 is switched to the heating cycle circuit side. FIG. 6 is an explanatory diagram for explaining the relationship between the temperature difference from the set temperature of the cooling water and the rotational speed of the compressor in the cooling water temperature adjusting device shown in FIGS. 4 and 5. It is the schematic for demonstrating the conventional temperature control apparatus of cooling water. It is explanatory drawing explaining the relationship between the temperature difference with the preset temperature of a cooling water, and the rotation speed of a compressor. It is the schematic for demonstrating the temperature control apparatus of the improved cooling water.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Compressor 12 1st heat exchanger 14 2nd heat exchanger 16a, 16b Expansion valve 17a, 17b Check valve 18 Inverter 20 Storage tank 22 Liquid feed pump 24 Four way valve 26a 1st bypass piping 26b 2nd bypass piping 28a 1st 1 control valve 28b 2nd control valve 30 control part 32 accumulator 34 temperature sensor 36, 40, 44 piping 42, 46 control valve

Claims (6)

A compressor that compresses the cooling medium, a first heat exchanger that heats or cools the cooling medium, a second heat exchanger that performs heat exchange between the cooling medium and cooling water, and the cooling medium The number of rotations of the compressor is controlled based on a temperature difference between the expansion valve and the temperature of the cooling water and a set temperature, and when the number of rotations decreases to a predetermined number of rotations, the number of rotations of the compressor is reduced. An inverter that maintains the predetermined number of revolutions,
The cooling medium compressed by the compressor and cooled by the first heat exchanger is adiabatically expanded and cooled by the expansion valve and then cooled and supplied to the second heat exchanger, and the compression cycle circuit Cooling medium that is heated by the second heat exchanger that is compressed and supplied by the machine and that dissipates the cooling medium is adiabatically expanded and cooled by the expansion valve, and then is supplied to the first heat exchanger and the temperature is raised. A temperature adjusting device for cooling water provided with a four-way valve for switching between a water heating cycle circuit,
A first control valve disposed in a first bypass pipe that bypasses the first heat exchanger and the expansion valve; a second control valve disposed in a second bypass pipe that bypasses the second heat exchanger; Is provided,
When the four-way valve is switched to the cooling cycle circuit side and the rotation speed of the compressor reaches a predetermined rotation speed, the temperature of the cooling water is adjusted when the temperature of the cooling water is adjusted. Among them, the cooling medium that has been divided into the first bypass pipe is mixed with the other cooling medium that has been cooled by passing through the first heat exchanger and the expansion valve, and is supplied to the second heat exchanger. Adjust the temperature of
In addition, when the four-way valve is switched to the heating cycle circuit side and the rotation speed of the compressor has reached a predetermined rotation speed, when the temperature of the cooling water is adjusted, the cooling medium compressed by the compressor Part of the first control valve and the second control valve are adjusted to the temperature of the cooling water so as to adjust the amount of the cooling medium supplied to the second heat exchanger. And a control unit for controlling the temperature based on a temperature difference between the temperature and the set temperature.   The temperature adjustment device for cooling water according to claim 1, wherein the second bypass pipe is a bypass pipe that bypasses the second heat exchanger and the expansion valve. A compressor that compresses the cooling medium, a first heat exchanger that heats or cools the cooling medium, a second heat exchanger that performs heat exchange between the cooling medium and cooling water, and the cooling medium The number of rotations of the compressor is controlled based on a temperature difference between the expansion valve and the temperature of the cooling water and a set temperature, and when the number of rotations decreases to a predetermined number of rotations, the number of rotations of the compressor is reduced. An inverter that maintains the predetermined number of revolutions,
The cooling medium compressed by the compressor and cooled by the first heat exchanger is adiabatically expanded and cooled by the expansion valve and then cooled and supplied to the second heat exchanger, and the compression cycle circuit Cooling medium that is heated by the second heat exchanger that is compressed and supplied by the machine and that dissipates the cooling medium is adiabatically expanded and cooled by the expansion valve, and then is supplied to the first heat exchanger and the temperature is raised. A temperature adjusting device for cooling water provided with a four-way valve for switching between a water heating cycle circuit,
A first control valve is disposed in a first bypass pipe that bypasses the first heat exchanger and the expansion valve;
When the four-way valve is switched to the cooling cycle circuit side and the rotation speed of the compressor reaches a predetermined rotation speed, when the temperature of the cooling water is adjusted, among the cooling medium compressed by the compressor, The temperature of the cooling medium supplied to the second heat exchanger by mixing the cooling medium divided into the first bypass pipe with the other cooling medium cooled by passing through the first heat exchanger and the expansion valve. Controlling the first control valve to adjust
And when the said four-way valve is switched to the heating cycle circuit side and the rotation speed of the said compressor reaches | attains predetermined rotation speed, when adjusting the temperature of the said cooling water, the said four-way valve is switched to the cooling cycle circuit side And a controller for controlling the switching of the four-way valve from the heating cycle circuit side to the cooling cycle side based on the rotational speed of the compressor.   The temperature adjustment apparatus for cooling water according to any one of claims 1 to 3, wherein an expansion valve is provided in each of the cooling cycle circuit and the heating cycle circuit.   The temperature adjustment apparatus for cooling water according to any one of claims 1 to 4, wherein the first heat exchanger is provided with a fan that blows external air toward a pipe through which the cooling medium passes.   The first heat exchanger is provided with a piping and a control valve so that the cooling medium is supplied from the same direction even when the four-way valve is switched to the heating cycle circuit side or the cooling cycle circuit side. The temperature adjustment apparatus of the cooling water as described in any one of -5.

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