JPH0835738A - Constant-temperature controller and constant-temperature controlling method - Google Patents

Abstract

PURPOSE:To provide a constant-temperature controller and a method of controlling at a constant temperature in which stable constant-temperature water can be supplied immediately after a load to be a constant temperature is operated. CONSTITUTION:The constant-temperature controller comprises temperature detecting means 5 for detecting a temperature in a heat storage tank 4 to output a temperature detection signal ST, discriminating means 8 for discriminating whether a load 6 is during operating or not, and control means 8 for controlling a heat pump type refrigerator 3 to hold the temperature in the tank to a first set temperature higher than a predetermined temperature when the load 6 is not operated and the temperature in the tank is higher than a predetermined temperature and controlling a heat pump 3 to hold the temperature in the tank to a second set temperature lower than the predetermined temperature when the temperature in the tank is lower than the predetermined temperature of the constant-temperature water as the load 6 is not operated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a constant temperature controller,
It is especially used in processing machines such as laser processing machines, electrolytic machine tools, high-frequency heating devices, and resin molding machines. It exchanges heat with brine (Brine) to generate constant temperature water, and circulates this constant temperature water. The present invention relates to a constant temperature control device that keeps the temperature of a load such as a jig constant.

[0002]

2. Description of the Related Art As a conventional constant temperature control device, Japanese Patent Application Laid-Open No.
The one described in Japanese Patent Publication No. 34212 is mentioned.

This thermostatic controller is provided with a thermostatic bath, and cools the brine by circulating the brine in the thermostatic bath with a heat pump chiller.

Further, the brine is circulated between the constant temperature bath and the load of the jig portion of the processing machine, and the temperature of the brine is kept constant to keep the load temperature constant.

[0005]

In such a constant temperature control device, since the operation is started at the same time when the operation of the load is started, the temperature of the constant temperature water is maintained immediately after the start of the operation of the constant temperature control device. When it is used in a processing device that is not stable and requires high processing accuracy, there is a problem in that the accuracy decreases.

Therefore, an object of the present invention is to provide a constant temperature control device and a constant temperature control method capable of supplying stable constant temperature water immediately after the operation of a load to be kept constant temperature.

[0007]

In order to solve the above-mentioned problems, the invention according to claim 1 circulates a primary system heat medium cooled or heated by a heat pump type refrigerating apparatus to make the temperature inside the heat storage tank predetermined. Temperature control, heat exchange with the heat medium is performed via this heat storage tank to generate constant temperature water of the secondary system, and constant temperature control is performed to circulate the constant temperature water to control the temperature of the load constant. In the device, temperature detecting means for detecting a temperature inside the heat storage tank and outputting a temperature detection signal, judging means for judging whether or not the load is operating, and based on the temperature detection signal and the judgment signal In the case where the load is not operating and the bath temperature is higher than the predetermined temperature, the bath temperature should be kept at the first set temperature higher than the predetermined temperature. Controls the heat pump device Both wherein when load the chamber temperature even if it is not running is lower than a predetermined temperature of the constant-temperature water, the predetermined lower than the temperature second
And control means for controlling the heat pump device so as to maintain the temperature in the bath at the set temperature.

According to a second aspect of the present invention, the temperature inside the heat storage tank is maintained at a predetermined temperature by circulating the primary system heat medium cooled or heated by the heat pump type refrigerating device, and the heat storage tank is used to store the temperature inside the tank. In the constant temperature control method of generating constant temperature water of the secondary system by exchanging heat with the heat medium and controlling the temperature of the load to be constant by circulating the constant temperature water, the temperature inside the heat storage tank is detected. When the load is not operating based on a temperature detection step, a determination step of determining whether or not the load is operating, and a bath internal temperature detected by the temperature detection step and a determination result of the determination step When the temperature inside the tank is higher than the predetermined temperature, while controlling the heat pump type refrigerating device to maintain the temperature inside the tank at a first set temperature higher than the predetermined temperature, The load is moving If not, and if the temperature in the bath is lower than the predetermined temperature of the constant temperature water, the heat pump device is provided to maintain the temperature in the bath at a second set temperature lower than the predetermined temperature. And a control step for controlling.

[0009]

According to the first aspect of the invention, the temperature detecting means detects the temperature inside the heat storage tank and outputs a temperature detection signal to the control means. Further, the determining means determines whether or not the load is operating.

Based on these, the control means, based on the temperature detection signal and the discrimination signal, when the load is not operating and the temperature inside the tank is higher than the predetermined temperature, the control means is higher than the predetermined temperature. The heat pump device is controlled to maintain the temperature in the bath at the first set temperature, and when the load is not operating and the temperature in the bath is lower than the predetermined temperature of the constant temperature water, the predetermined temperature is set. The heat pump device is controlled so as to maintain the temperature in the bath at the second set temperature lower than the above.

According to the second aspect of the invention, the temperature detecting step detects the temperature inside the heat storage tank, and the determining step determines whether or not the load is operating.

Based on these, the control process is based on the temperature inside the tank detected by the temperature detection process and the judgment result of the judgment process when the load is not operating and the temperature inside the tank is higher than the predetermined temperature. In addition to controlling the heat pump device to maintain the temperature inside the tank at the first set temperature higher than the predetermined temperature, the temperature inside the tank is lower than the predetermined temperature of the constant temperature water when the load is not operating. Is also low,
The heat pump device is controlled so as to maintain the temperature inside the bath at the second set temperature lower than the predetermined temperature.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will now be described with reference to the drawings.

FIG. 1 shows a schematic block diagram of the constant temperature controller.

The constant temperature control device 1 comprises a primary pump 2 for circulating brine as a heat medium, a heat pump type refrigerating device (heat pump chiller) 3 for cooling or heating the circulating brine, and water. Filled with water, the heat storage tank 4 that exchanges heat with the brine to store heat, the cold water temperature sensor 5 that detects the temperature inside the heat storage tank 4 and outputs the temperature detection signal ST, and the temperature of the load 6 are constant. Heat storage tank 4
Secondary-side pump 7 that circulates the internal water (constant temperature water) and load 6
A controller 8 that functions as a determination unit that determines whether or not is operating and controls the entire constant temperature controller 1
And are provided.

Next, the operation will be described with reference to FIGS. In this case, the load is not operated from 10 pm to 8 am. The set temperature (target temperature) of the constant temperature water is 20 ° C., and the first set temperature is 21 ° C. when the temperature of the water in the heat storage tank 4 is higher than the set temperature of the constant temperature water = 20 ° C. When the temperature of the water is lower than the set temperature of the constant temperature water = 20 ° C., the second set temperature is 19 ° C., and the allowable error of each set temperature is ± 0.5 ° C.

First, the control unit 8 determines whether or not the current time is between 10 pm and 7:59 am, that is, whether or not the current time belongs to a time zone in which the load does not operate (step). S1).

When the current time is not between 10 pm and 7:59 am (step S1; No), that is,
If the current time belongs to the time zone in which the load operates, the process proceeds to step S9.

When it is determined in step S1 that the current time is between 10 pm and 7:59 am (step S1; Yes), that is, if the current time belongs to a time zone during which the load does not operate. Determines whether the water temperature T0 in the heat storage tank 4 is higher than 20 ° C. based on the temperature detection signal ST from the cold water temperature sensor 5 (step S2).

When the water temperature in the heat storage tank 4 is higher than 20 ° C. (step S2; Yes), the control device 8 sets the operation mode to the pre-cooling mode (step S3), and again the temperature from the cold water temperature sensor 5 is set. The heat storage tank 4 based on the detection signal ST
It is determined whether the water temperature T1 therein is higher than 21.5 ° C. (= 21 ° C. + 0.5 ° C.) (step S4).

When the water temperature T1 in the heat storage tank 4 is lower than 21.5 ° C. (step S4; No), the control device 8 enters the standby state and repeats the process of step S4.

When the water temperature T1 in the heat storage tank 4 is higher than 21.5 ° C. according to the determination in step S4 (step S; Ye
In s), the controller 8 starts the cooling operation (step S5), and when the temperature in the heat storage tank 4 reaches 21.5 ° C., the compressor of the heat pump chiller 3 and the primary side pump 2 are operated (turned on). ), The temperature in the heat storage tank 4 is 20.5 ° C. (= 21
(° C-0.5 ° C), the compressor and the primary pump 2 are stopped (turned off), and the temperature in the heat storage tank 4 is changed to 21 ° C ± 0.5 ° C.
Control (see FIG. 4A).

In the determination in step S2, the water temperature is 20
When the temperature is lower than ℃ (step S2; No), the controller 8 sets the operation mode to the preheat mode (step S2).
6) Again, based on the temperature detection signal ST from the cold water temperature sensor 5, the water temperature T2 in the heat storage tank 4 is 19.5 ° C (= 19 ° C-
It is determined whether the temperature is lower than 0.5 ° C (step S).
7).

When the water temperature T2 in the heat storage tank 4 is higher than 19.5 ° C. (step S7; No), the controller 8 goes into a standby state and repeats the process of step S7.

If the water temperature T2 in the heat storage tank 4 is lower than 19.5 ° C. by the determination in step S7 (step S7; Y
es), the control device 8 starts the heating operation (step S8), and when the temperature in the heat storage tank 4 reaches 18.5 ° C., the compressor of the heat pump chiller 3 and the primary side pump 2 are operated (turned on). ), The temperature in the heat storage tank 4 is 19.5 ° C. (= 1
9 ° C. + 0.5 ° C.), the compressor and the primary-side pump 2 are stopped (turned off), and the temperature in the heat storage tank 4 is set to 19 ° C. ± 0.5.
The temperature is controlled to be 0 ° C. (see FIG. 4C).

When it is determined in step S1 that the current time is not between 10 pm and 7:59 am (step S1; No), that is, if the current time belongs to the time zone in which the load operates. It is determined whether or not the load has started the operation (operation) (step S9), and when the load is not operating (step S9; No), the control device 8
Stands by and repeats the process of step S9.

When it is determined in step S9 that the load has started to operate (operation) (step S9; Yes), the controller 8 operates the secondary pump 7 and the temperature from the cold water temperature sensor 5. Based on the detection signal ST, it is determined whether the water temperature T3 in the heat storage tank 4 is higher than 20.5 ° C (= 20 ° C (set temperature of constant temperature water) + 0.5 ° C) (step S10).

When the water temperature T3 in the heat storage tank 4 is lower than 20.5 ° C. (step S10; No), the controller 8
The standby state is entered, and the process of step S10 is repeated.

If the water temperature in the heat storage tank 4 is higher than 20.5 ° C. by the determination in step S10 (step S10; Y
In es), the control device 8 starts the cooling operation (step S11), and when the temperature in the heat storage tank 4 reaches 20.5 ° C., the compressor of the heat pump chiller 3 and the primary side pump 2 are operated (turned off). ), The temperature in the heat storage tank 4 is 19.5 ° C (=
20 ° C-0.5 ° C) Compressor and primary side pump 2
Is stopped (turned on), and the temperature in the heat storage tank 4 is set to 20 ° C. ± 0.
The temperature is controlled to 5 ° C. (see FIG. 4B).

As described above, according to this embodiment,
Since the pre-cooling operation and pre-heating operation are performed during the time when the load is not operating, it is possible to immediately supply constant temperature water with stable temperature even when the load operation of the processing machine etc. starts, improving the processing accuracy. it can.

Further, fine control can be performed based on whether or not the load is in operation, or the water temperature difference in the heat storage tank based on the difference in outside air temperature due to the difference in summer, winter, etc. The power can be reduced further.

Furthermore, since the precooling operation and the preheating operation are performed by using the nighttime electric power whose electric charge is low, the running cost can be reduced.

[0033]

According to the first aspect of the invention, the control means controls the inside of the tank when the load is not operating based on the temperature detection signal output by the temperature detection means and the determination of the determination means. When the temperature is higher than the predetermined temperature, the heat pump type refrigerating apparatus is controlled to keep the temperature inside the tank at the first set temperature higher than the predetermined temperature, and the load is not operating. When the temperature inside the tank is lower than the predetermined temperature of the constant temperature water, the heat pump device is controlled so as to maintain the temperature inside the tank at the second set temperature lower than the predetermined temperature. Stable constant temperature water can be supplied, the load operation accuracy, etc. can be improved, and fine grained control can be performed based on the water temperature in the heat storage tank based on the difference in outside temperature due to differences in summer, winter, etc. To do Yellow, power consumption can be further reduced.

According to the second aspect of the present invention, the control step is based on the temperature inside the tank detected by the temperature detecting step and the temperature inside the tank based on the judgment result of the judgment step. Is higher than the predetermined temperature, the heat pump device is controlled to keep the temperature inside the tank at the first set temperature higher than the predetermined temperature, and the temperature inside the tank is not when the load is not operating. When the temperature of the constant temperature water is lower than the predetermined temperature, the heat pump device is controlled to maintain the temperature in the tank at the second set temperature lower than the predetermined temperature, so that the constant temperature water that is stable even when the load starts to operate. Can be supplied to improve the load operation accuracy, etc., and fine control can be performed based on the water temperature in the heat storage tank based on the difference in outside temperature due to the difference in summer, winter, etc. , Power consumption It can be further reduced.

[Brief description of drawings]

FIG. 1 is a schematic configuration block diagram of a constant temperature control device.

FIG. 2 is a processing flowchart of a constant temperature control device.

FIG. 3 is an operation explanatory diagram of a constant temperature control device.

[Explanation of symbols]

 1 Constant Temperature Controller 2 Primary Pump 3 Heat Pump Chiller (Heat Pump Refrigerator) 4 Heat Storage Tank 5 Cold Water Temperature Sensor 6 Load 7 Secondary Pump 8 Controller ST Temperature Detection Signal

Claims (2)

[Claims] 1. A primary system heat medium cooled or heated by a heat pump type refrigerating apparatus is circulated to maintain a temperature inside the heat storage tank at a predetermined temperature, and heat exchange with the heat medium is performed via the heat storage tank. In the constant temperature control device for generating a secondary system constant temperature water and controlling the temperature of the load to be constant by circulating the constant temperature water, the temperature inside the heat storage tank is detected and a temperature detection signal is output. Temperature detecting means, determining means for determining whether or not the load is operating, and based on the temperature detection signal and the determination signal, the case where the load is not operating and the bath temperature is the When the temperature is higher than the predetermined temperature, the heat pump device is controlled to keep the temperature inside the bath at the first set temperature higher than the predetermined temperature, and the load is not operating. The temperature inside the tank When the temperature of the constant temperature water is lower than a predetermined temperature, control means for controlling the heat pump device to keep the temperature inside the bath at a second set temperature lower than the predetermined temperature is provided. Characteristic constant temperature controller. 2. A primary system heat medium cooled or heated by a heat pump type refrigerating apparatus is circulated to maintain a temperature inside the heat storage tank at a predetermined temperature, and heat is exchanged with the heat medium via the heat storage tank. In the constant temperature control method of generating a secondary system of constant temperature water and controlling the temperature of the load to be constant by circulating the constant temperature water, a temperature detecting step of detecting a temperature inside the heat storage tank, Based on the determination step of determining whether or not the load is operating, and the temperature inside the tank detected by the temperature detection step and the determination result of the determination step, when the load is not operating and the inside of the tank When the temperature is higher than the predetermined temperature, the heat pump device is controlled to maintain the temperature inside the bath at a first set temperature higher than the predetermined temperature, and the load is not operating. And before When the internal temperature of the storage tank is lower than a predetermined temperature of the constant temperature water, a control step of controlling the heat pump device to maintain the internal temperature of the bath at a second set temperature lower than the predetermined temperature, A constant temperature control method comprising: