JP2010094855A - Temperature controller - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a temperature controller for controlling high temperature using a rise of internal pressure of piping by cubical expansion of water, without using a booster pump. <P>SOLUTION: A temperature controller 11 is provided with a control unit 30 for controlling drive of a circulation pump 13, controlling energization of a heating unit 14, and controlling opening and closing of a water supply valve 18, water discharge valve 19, and a cooling-water solenoid valve 26. The control unit 30 is provide with: a control function to open the water supply valve 18 and water discharge valve 19 to discharge air in a circulation circuit 15 to the exterior; a control function to close the water discharge valve 19 while to open the water supply valve 18 to control heating of a heating medium in the circulation circuit 15 by the heating unit 14 under pressure of pressurized supply water (tap water pressure); and a control function to control heating of the heating medium in the circulation circuit 15 by the heating unit 14, under higher pressure than the pressure of the pressurized supply water (tap water pressure) in which the circulation circuit 15 is controlled to a closed circuit by closing the water supply valve 18 and water discharge valve 19. An accumulator 23 for pressure accumulation to reduce a pressure change in the piping is installed in front of the water discharge valve 19. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a temperature controller using pressurized supply water as a heat medium.

Water boils at 100 ° C. under atmospheric pressure (0.1001325 MPa (abs)). In a temperature controller using water as a medium,
When the medium temperature is 100 ° C. or less, temperature adjustment is performed by medium circulation under atmospheric pressure.

  When the medium temperature exceeds 100 ° C., tap water introduced into the circulation circuit 3 through the water supply pipe 2 connected to the tap water supply port 1 is used as a heat medium as shown in the piping system diagram of FIG. While circulating with the circulation pump 4, a temperature controller that supplies the tap water heated by the heating device 5 to the temperature adjuster 6 is used to utilize the supply pressure from the outside such as tap water pressure, By applying a pressure equal to or higher than the saturated vapor pressure of water to the suction side, the temperature can be adjusted in a region exceeding 100 ° C. For example, at 120 ° C., the temperature can be adjusted by adding 0.19849 MPa (abs).

  However, the supply pressure of tap water or the like is generally about 0.3 MPaG (gauge pressure), and under this pressure, the temperature can be raised to 144 ° C., but further temperature adjustment is necessary. In such a case, as shown in the piping system diagram of FIG. 8, a water pressure exceeding the saturated steam pressure at the target temperature is obtained using a temperature controller to which a hot water tank 7 and a booster pump (a booster pump or a booster pump) 8 are added. Need to supply.

Also, a high-temperature heat medium circulation system such as a high-temperature water tank and pump and a low-temperature heat medium circulation system such as a low-temperature water tank and pump are provided, and the heat medium supplied to the mold is divided into a high-temperature water cycle and a low-temperature water cycle. There is also a mold temperature control device that can be switched between (see, for example, Patent Document 1 or 2).
Japanese Patent Laying-Open No. 2005-225042 (pages 11-14, FIGS. 9-13) JP 2006-110905 A (page 8-10, FIGS. 1-4)

  Since the temperature controller shown in FIG. 8 and the mold temperature controller described in Patent Document 1 or 2 require at least two types of pumps that are always driven or cycle driven, they are shown in FIG. Compared to a temperature controller, there is a problem that the cost of at least one pump and its accompanying parts is increased and the power consumption of the pump is increased.

  This invention is made in view of such a point, and provides the temperature regulator which can adjust high temperature temperature without using a pressure | voltage rise pump using the raise of the pressure in piping by volume expansion of water. Objective.

  According to the first aspect of the present invention, there is provided a circulation circuit that circulates a heat medium through a temperature adjusting body by a circulation pump and is heated by a heating device, and a water supply pipe that supplies pressurized circulation water as the heat medium to the circulation circuit A water supply valve that controls the opening and closing of the passage, a drain valve that discharges the heat medium from the circulation circuit to the outside, and a heating device that heats the heat medium in the circulation circuit by opening the water supply valve and closing the drain valve and applying pressurized water And a controller for controlling heating of the heat medium in the circulation circuit by a heating device under a pressure higher than the pressurized supply water pressure that controls the circulation circuit to be closed by closing the water supply valve and the drain valve. It is.

  According to a second aspect of the present invention, in the temperature controller according to the first aspect, an accumulator for accumulating pressure that relaxes a pressure change in the circulation circuit is provided.

  According to a third aspect of the present invention, the drain valve and the accumulator in the temperature controller according to the second aspect are provided in a pipe line that discharges water that has made a round in the circulation circuit from a water supply location that receives the water supply in the circulation circuit. It is what was done.

  According to a fourth aspect of the present invention, in the temperature regulator according to the second or third aspect, when the pressure in the circulation circuit provided in the water supply pipe becomes equal to or lower than the set pressure, the pressure regulator is replenished. And an auxiliary pump that stops.

  According to a fifth aspect of the present invention, there is provided a cooling heat exchanger provided in a circulation circuit, in which the temperature controlled body in the temperature controller according to any one of the first to fourth aspects is a mold for an injection molding machine. And a cooling water pipe for supplying cooling water to the cooling heat exchanger, and a cooling water solenoid valve for opening and closing the cooling water pipe based on a command from the control device.

  According to the invention described in claim 1, the control device opens the water supply valve and closes the drain valve, and controls the heating medium in the circulation circuit to be heated under the pressurized supply water pressure. The first stage water temperature exceeding 100 ° C. can be obtained by applying a pressure higher than the saturated steam pressure of water to the pressure supply water pressure higher than the pressurized supply water pressure which closed the water supply valve and drain valve and controlled the circulation circuit to a closed circuit. Under the control of the heating medium in the circulation circuit, the increase in the pressure in the pipe due to the volume expansion of the water is utilized, so that the temperature higher than the first stage water temperature can be obtained without using a conventional booster pump. A two-stage water temperature can be easily obtained.

  According to the invention described in claim 2, since a rapid pressure rise when the circulation circuit is controlled to a closed circuit is relieved by the accumulator and a gentle pressure rise can be obtained, Temperature control can be facilitated.

  According to the invention described in claim 3, since the drain valve discharges the water that has made one round in the circulation circuit to the outside, the air in the circulation circuit can be efficiently discharged to the outside at the start of operation, and the accumulator Water in the circulation circuit that has risen excessively and cannot be accumulated is immediately discharged to the outside by opening the drain valve provided in the accumulator installation pipeline, and the pressure in the circulation circuit can be maintained appropriately. .

  According to the invention described in claim 4, when there is a lot of leakage from the valve or the pipe, and the pressure sealed in the circulation circuit is insufficient even with the accumulated pressure in the accumulator, the auxiliary pump operates. Thus, the pressure drop in the circulation circuit can be compensated. Since this auxiliary pump does not operate at all times, the pump life can be extended and the power consumption of the pump can be saved as compared with the conventional booster pump.

  According to the invention described in claim 5, the cooling water conduit for supplying the cooling water to the cooling heat exchanger, while ensuring the mold temperature necessary for injection molding by the mold for the injection molding machine, Since the opening / closing control is performed by the cooling water solenoid valve based on a command from the control device, a cooling temperature required for mold opening and product removal after injection molding can be secured.

  Hereinafter, the present invention will be described in detail with reference to one embodiment shown in FIGS. 1 to 5 and another embodiment shown in FIG.

  A temperature controller 11 shown in the piping system diagram of FIG. 1 circulates pressurized supply water, that is, tap water, as a heat medium, circulated by a circulation pump 13 through a temperature controlled body 12 and heated by a heating device 14. A water supply valve 18 for controlling the opening and closing of a water supply pipe 17 for supplying pressurized supply water of the heat medium to the circulation circuit 15 from a water supply port 16, and a drain valve 19 for discharging the heat medium from the circulation circuit 15 to the outside. I have.

  In this circulation circuit 15, a pipeline 22 is drawn from the upstream side of the water supply location 21 that receives the water supply, and the drainage that discharges the water that has made a circuit in the circulation circuit 15 from the upstream side of the water supply location 21 to the outside in this pipeline 22 A valve 19 is provided, and an accumulator 23 for accumulating pressure that relaxes the pressure change in the pipe is installed in front of the drain valve 19.

  The temperature-adjusted body 12 is, for example, a mold for an injection molding machine, and a cooling heat exchanger 24 is provided in the circulation circuit 15 as a mold cooling means necessary for a cooling process of injection molding. A cooling water pipe 25 for supplying tap water as cooling water to the exchanger 24 is provided, and a cooling water electromagnetic valve 26 for opening and closing the cooling water pipe 25 is installed.

  The cooling water pipe 25 is communicated with the drain outlet 28 via the drain pipe 27. A drain valve 19 is connected to the drain pipe line 27 through an orifice 29.

  The temperature controller 11 includes a control device 30 that controls and drives the circulation pump 13, controls energization of the heating device 14, and controls opening and closing of the water supply valve 18, the drain valve 19, and the cooling water electromagnetic valve 26. The control device 30 and each control object controlled thereby are connected by wiring (not shown).

  The control device 30 opens the water supply valve 18 and the drain valve 19 to discharge the air in the circulation circuit 15 to the outside, and opens the water supply valve 18 and closes the drain valve 19 to pressurize the supply water pressure (tap water pressure). ) Under the control function to control the heating medium in the circulation circuit 15 by the heating device 14 under the pressure supply water pressure (tap water pressure) that closed the water supply valve 18 and drain valve 19 and controlled the circulation circuit 15 to the closed circuit And a control function for controlling heating of the heat medium in the circulation circuit 15 by the heating device 14 under high pressure.

  The circulation circuit 15 receives hot water as a heat medium whose temperature is adjusted from the heat medium return side pipe 31 via the circulation pump 13, the cooling heat exchanger 24, the heating device 14, and the heat medium discharge side pipe 32. A heat medium circulation path is formed which sends the heat medium to the adjusting body 12 and returns the heat medium from the temperature adjusted body 12 to the heat medium return side pipe 31.

  The heat medium return side pipe 31 is provided with a pressure gauge 33 for displaying the suction side pressure of the heat medium, the circulation pump 13 is connected with an electric motor 34 for driving the pump, and the heating device 14 is provided with a heater in the tank 35. 36 and a temperature sensor 37 for detecting the heater temperature. The heat medium discharge side pipe 32 includes a pressure gauge 38 for displaying the discharge side pressure of the heat medium, a pressure sensor 39 for detecting the pressure of the heat medium, and a heat sensor. A temperature sensor 40 for detecting the temperature of the medium is provided.

  A temperature sensor 37 for detecting the heater temperature, a pressure sensor 39 for detecting the medium pressure, and a temperature sensor 40 for detecting the medium temperature are connected to the input terminal of the control device 30, and the water supply valve 18, the drain valve 19, and the cooling water The electromagnetic valve 26, the electric motor 34 for driving the pump, and the heater 36 are connected to the output terminal of the control device 30.

  A manual on-off valve 41 and a pipe joint 42 are provided in the pipe between the temperature controller 11 and the temperature-controlled body 12, and the manual on-off valve 41 is fully opened after the pipe joint 42 is connected. keep.

  Next, the operation of the embodiment shown in FIG. 1 will be described.

  First, at the start of operation, when the water supply valve 18 and the drain valve 19 are opened, the water supplied into the water supply pipe 17 from the water supply port 16 passes from the middle of the heat medium return side pipe 31 via the water supply valve 18 to the circulation circuit. 15, and is supplied to the temperature-controlled body 12 by the circulation pump 13 through the cooling heat exchanger 24 and the heating device 14. The waste water from the temperature controlled body 12 is branched from the middle of the heat medium return side pipe 31 and is discharged to the outside through the drain valve 19 together with the air in the pipe of the circulation circuit 15 from the drain port 28.

  After the air in the piping of the circulation circuit 15 has been completely exhausted, the tap water pressure equal to or higher than the saturated vapor pressure of water is applied to the suction side of the circulation pump 13 by closing the drain valve 19, and the water in the circulation circuit 15 is drained. Since it can heat with the heater 36, pressurizing, the water temperature of about 120 degreeC can be obtained. This hot water is supplied to the temperature-controlled body 12 by the circulation pump 13, and the temperature-controlled body 12 is heated.

  Further, the water supply valve 18 is closed, and the pressure supplied from the water supply port 16 in the piping of the circulation circuit 15 is sealed. The sealed water is sucked into the circulation pump 13 from the heat medium return side pipe 31 and discharged from the circulation pump 13, and the cooling heat exchanger 24, the heating device 14, the heat medium discharge side pipe 32, and the temperature-adjusted body 12 are connected. A closed circuit that circulates is formed.

  In this way, the water in the closed circuit formed by closing the water supply valve 18 and the drain valve 19 is heated by the heating device 14 to increase the pressure using the increase in the pressure in the pipe due to the volume expansion of the water. The water temperature can be raised to about 150 ° C. to 160 ° C. by increasing the water pressure without using a pump.

  The temperature adjustment is performed by the heater 36 for heating control and the cooling water solenoid valve 26 for cooling control. That is, when the cooling water solenoid valve 26 is opened, the cooling water is passed through the cooling heat exchanger 24, and the circulating water in the circulation circuit 15 is indirectly cooled.

  The accumulator 23 absorbs pressure more than necessary caused by thermal expansion during heating of the medium, and accumulates in the accumulator 23. The accumulator 23 accumulates pressure to prevent a sudden (steep) pressure rise in the circulation circuit 15 and to maintain the pressure in the pipe for a long time even if a slight leak from the valve or pipe occurs. Is possible. The excessively increased water pressure that cannot be accumulated in the accumulator 23 is discharged to the outside through the drain outlet by opening the drain valve 19.

  In the case of rapidly cooling the temperature-controlled body 12, the energization output to the heater 36 is turned off, and the circulating pump 13 is operated. Indirect cooling.

  Next, an experimental example in which the water supply valve 18 and the drain valve 19 are opened and closed to allow the cooling water to flow directly will be described with reference to FIGS.

(1) Experiments to increase the pressure in the pipe The relationship between the temperature (x) and the volume (y) of the water is obtained from the relationship between the temperature and density of the water (see, for example, the 1992 scientific chronology) (see Fig. 2). ). From the graph of the relationship between water temperature and volume, the following approximate expression is obtained.

y = 4 × 10 ⁻⁶ x ² + 4 × 10 ⁻⁵ x + 1

  In the actual machine test having the configuration shown in FIG. 1, the water supply valve 18 and the drain valve 19 are opened, and water is passed through the piping of the circulation circuit 15. The air in the pipe is completely discharged from the drain port 28 while the circulation pump 13 is operated, and then the drain valve 19 is closed. Next, the water supply valve 18 is closed, and the pressure supplied from the water supply port 16 in the piping of the circulation circuit 15 is sealed. FIG. 3 shows the result of measuring the relationship between the circulating water temperature and the pressure in the piping by energizing and driving the heater 36 to increase the temperature.

  The relationship between the volume of water (A, B) and the pressure in the pipe (C, D) shown in the following Table 1 is obtained from the measurement result shown in FIG. 3 as “No accumulator”. The water volume A and the pipe internal pressure C are reference values when the measured water temperature is 27 ° C., and the water volume B and the pipe internal pressure D are those when the measured water temperature is 28 ° C. or higher.

  From the relationship between the water volume (A, B) shown in Table 1 and the pipe internal pressure (C, D), the water volume difference (X = B−A) shown in FIG. 4 and the pipe internal pressure difference are shown. A measurement graph representing the relationship with (Y = D−C) is obtained. The following approximate expression is obtained from the measurement graph shown in FIG.

Y = 0.1791X ² + 0.167X

  In FIG. 4, since X = B−A and Y = D−C, the following approximate expression is obtained by converting into an expression for obtaining the pipe internal pressure D [MPaG].

D = 0.1791 (B−A) ² +0.167 (B−A) + C

(2) Experiments for accumulating increased pipe pressure
From the experimental result of (1), it is possible to seal a high pressure in the pipe with a slight rise in water temperature, but since the sealing pressure becomes too high with respect to the adjustment temperature, it is in front of the drain valve 19 of the heat medium return side pipe 31. An accumulator 23 was attached, and an experiment was conducted to confirm whether excess pressure could be accumulated.

  Using the accumulator 23 volumes of 100 mL and 300 mL, the circulating water temperature was raised in the same manner as in the actual machine test in (1), with a total of 4 types of sealed gas pressures of 0.8 MPaG and 0.4 MPaG being filled. The result of measuring the internal pressure and comparing it with the case without accumulator 23 is shown in FIG.

  Further, the relationship between the amount of accumulated water in the pipe and the pressure in the pipe is measured, and the result compared with the case without the accumulator is shown in FIG.

  As a result, by using the accumulator 23, it was confirmed that a sudden (steep) pressure rise or drop was suppressed in the process of raising the circulating water temperature, and pressure was accumulated. (See FIGS. 3 and 5).

  Next, the effect of the embodiment shown in FIG. 1 will be described.

  The control device 30 opens the water supply valve 18 of the water supply pipe line 17 and closes the drain valve 19 to control the heating medium in the circulation circuit 15 under a pressurized supply water pressure (tap water pressure) to exceed 100 ° C. The first stage water temperature can be obtained, and the heat medium in the circulation circuit 15 can be supplied at a pressure higher than the pressurized supply water pressure (tap water pressure) obtained by closing the water supply valve 18 and the drain valve 19 and controlling the circulation circuit 15 to the closed circuit. By controlling the heating, it is possible to easily obtain a second stage water temperature that is higher than the first stage water temperature without using a conventional booster pump by utilizing the increase in the pressure in the pipe due to the volume expansion of water. it can.

  Further, since the booster pump 8 and its accompanying parts as shown in FIG. 8 are not required, the cost can be reduced, and the power consumption of the pump used for the operation of the conventional booster pump 8 can be saved. Furthermore, since the frequency of opening and closing the water supply valve 18 and the drain valve 19 can be suppressed, the life of these valves can be extended.

  In addition, since the accumulator 23 moderates a sudden (steep) pressure rise when the circulation circuit 15 is controlled to a closed circuit, a moderate pressure rise can be obtained. Therefore, temperature control when heating the heating device 14 is controlled. Can be made easier.

  Furthermore, since the drain valve 19 discharges the water that has made a round in the circulation circuit 15 to the outside, the air in the circulation circuit 15 can be efficiently discharged to the outside at the start of operation, and it cannot be accumulated in the accumulator 23 excessively. The water in the circulation circuit 15 whose pressure has increased can be immediately discharged to the outside from the drain port 28 by opening the drain valve 19 provided in the installation pipe line of the accumulator 23, and the pressure in the pipe can be maintained appropriately.

  When the temperature adjusting body 12 is an injection molding machine mold, the mold temperature required for injection molding can be secured by the injection molding machine mold, and the cooling heat exchanger 24 is cooled. Since the cooling water pipe 25 for supplying water is controlled to open and close by the cooling water electromagnetic valve 26 based on a command from the control device 30, a cooling temperature required for mold opening after injection molding and product removal can be secured.

  Next, another embodiment shown in FIG. 6 will be described. In addition, the same code | symbol is attached | subjected to the part similar to one Embodiment shown by FIG. 1, and the description is abbreviate | omitted.

  6, in addition to the configuration of the temperature controller 11 shown in FIG. 1, an auxiliary pump 51 is provided in the water supply pipe 17, and an electric motor 52 for driving the pump is connected to the auxiliary pump 51. In addition, a bypass passage 53 that bypasses the auxiliary pump 51 is provided, a check valve 54 is provided in the bypass passage 53, and a pipe 56 that passes through the relief valve 55 from the discharge side of the auxiliary pump 51 to the drain pipe 27 is further provided. Is provided.

  The auxiliary pump 51 is activated by the control device 30 so as to start when the pressure in the pipe becomes equal to or lower than the set pressure and to stop when the pressure in the circulation circuit 15 is replenished. In many cases, when the pressure sealed in the circulation circuit 15 is insufficient even when the pressure accumulated in the accumulator 23 is insufficient and the pressure drops, the auxiliary pump 51 provided between the water supply port 16 and the water supply valve 18 is activated, and the piping The internal pressure drop can be compensated.

  When the auxiliary pump 51 is stopped, pressurized supply water is supplied from the water supply port 16 to the water supply valve 18 via the check valve 54 in the bypass passage 53, and replenishment by the auxiliary pump 51 is supercharged. In this case, the supercharge is discharged from the relief valve 55 through the pipe 56 to the outside.

  The auxiliary pump 51 does not always operate, but starts when the pressure in the pipe falls below the set pressure due to leakage from the valve or pipe, and becomes an intermittent operation that stops when the pressure in the circulation circuit 15 is replenished. Therefore, the pump life can be extended as compared with the conventional booster pump shown in FIG. 8, and the pump power consumption can be saved.

  The temperature controller of the present invention can be used for molds for injection molding machines, boilers, semiconductor manufacturing, and the like.

It is a piping system diagram showing one embodiment of a temperature controller according to the present invention. It is a graph which shows the temperature and volume relationship of the water of a temperature controller same as the above. It is a graph which shows the relationship between the circulating water temperature of a temperature controller same as the above, and the pressure in piping. It is a graph which shows the relationship between the volume difference of the water of a temperature controller same as the above, and the pressure difference in piping. It is a graph which shows the relationship between the amount of accumulation water in piping of a temperature controller same as the above, and the pressure in piping. It is a piping system diagram which shows other embodiment of the temperature controller which concerns on this invention. It is a piping system diagram which shows an example of the conventional temperature controller. It is a piping system diagram which shows the other example of the conventional temperature controller.

Explanation of symbols

11 Temperature controller
12 Temperature controlled body
13 Circulation pump
14 Heating device
15 Circulation circuit
17 Water supply pipeline
18 Water supply valve
19 Drain valve
21 Water supply points
22 pipeline
23 Accumulator
24 Heat exchanger for cooling
25 Cooling water pipeline
26 Cooling water solenoid valve
30 Control unit
51 Auxiliary pump

Claims (5)

A circulation circuit that circulates the heat medium through a temperature-controlled body by a circulation pump and that is heated by a heating device;
A water supply valve for controlling opening and closing of a water supply line for supplying pressurized supply water as a heat medium to the circulation circuit;
A drain valve for discharging the heat medium from the circulation circuit to the outside;
Opening the water supply valve and closing the drain valve and controlling the heating medium in the circulation circuit with a heating device under pressurized supply water pressure, and controlling the circulation circuit to a closed circuit by closing the water supply valve and the drain valve And a controller that controls heating of the heat medium in the circulation circuit by a heating device at a pressure higher than water pressure. The temperature controller according to claim 1, further comprising an accumulator for accumulating to relieve a pressure change in the circulation circuit. The temperature regulator according to claim 2, wherein the drain valve and the accumulator are provided in a pipe line that discharges water that has made one round in the circulation circuit from a water supply point that receives water in the circulation circuit. The temperature control according to claim 2 or 3, further comprising an auxiliary pump provided in the water supply pipe and started when the pressure in the circulation circuit becomes lower than a set pressure and stopped when the pressure in the circulation circuit is replenished. Machine. The temperature controlled body is a mold for an injection molding machine,
A heat exchanger for cooling provided in the circulation circuit;
A cooling water conduit for supplying cooling water to the cooling heat exchanger;
The temperature regulator according to any one of claims 1 to 4, further comprising: a cooling water solenoid valve that controls opening and closing of the cooling water pipe line based on a command from a control device.

Images