JPH0454501Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a device that individually controls the temperature of multiple zones having different target temperatures.

BACKGROUND ART Conventionally, as a single zone temperature control device, for example, one described in Japanese Utility Model Application Publication No. 59-94816 is known. In this system, a closed temperature-controlled water circulation circuit is connected to the barrel of the extrusion molding machine, which is the temperature-controlled zone, and a heater and an air-cooling radiator are connected in series to the circulation circuit to control the temperature of the water. becomes lower than the lower limit set temperature,
The heater is operated to raise the temperature, and when the temperature-controlled water temperature becomes higher than the upper limit setting temperature, the radiator fan motor is operated to lower the temperature. By the way, if you want to use such a single-zone temperature control device to individually control the temperature of multiple zones with different target temperatures, connect the single-zone temperature control device described above to each zone. Must.

However, if this is done, a heater and a radiator are required for each zone, which causes problems in that the overall size of the device increases and the equipment cost increases. Moreover, since the temperature-controlled water radiates heat and is cooled when passing through the radiator even when the radiator is not in operation, there is a problem in that heat radiation loss occurs.

Problems to be Solved by the Invention This invention solves the conventional problems of increasing the size of the entire device, increasing equipment costs, and causing heat radiation loss.

Means to solve the problem This problem is caused by a multi-zone temperature control device that individually controls the temperature of multiple zones with different target temperatures, and which does not heat or cool the zones connected to each zone. When the first passage of the closed circuit through which the temperature control fluid circulates and the corresponding zones provided in the middle of each first passage become lower than the target temperature,
a heater for heating a temperature fluid in the passage; a second passage having both ends branched in the same number of branches as the first passage; and a second passage having both ends connected to the first passage; An on-off valve is provided at each branched end and opens when the temperature of the corresponding zone becomes higher than a target temperature, and an on-off valve is provided at the center of the second passage to cool the temperature regulating fluid flowing into the second passage. Return to the first passage 1
This can be solved by providing separate cooling means.

Operation When all zones are at their respective target temperatures, none of the heaters and cooling means are operated manually, all on-off valves are closed, and the temperature control fluid is in each first passage. circulating inside.
Next, when the temperature of any zone becomes lower than the target temperature, only the heater corresponding to that zone is operated to heat the temperature regulating fluid, thereby heating the zone. The heater is then deactivated when the zone reaches the target temperature. On the other hand, when the temperature of any zone becomes higher than the target temperature, the on-off valve corresponding to that zone is opened, and the temperature regulating fluid circulating in that zone flows into the second passage from the first passage. The temperature regulating fluid that has flowed into the second passage is cooled by the cooling means and then returned to the first passage. This cools the zone. Then, when the zone reaches the target temperature, the on-off valve is closed. As described above, this invention requires only one cooling means no matter how many zones there are, so the entire device becomes smaller and the equipment costs are reduced. Moreover, only when a given zone becomes higher than the target temperature, the on-off valve corresponding to that zone opens and the temperature regulating fluid flows into the cooling means, so the temperature regulating fluid is not constantly cooled. There is no heat loss due to heat radiation.

Embodiment Hereinafter, an embodiment of this invention will be described based on the drawings.

In the drawings, 1 indicates a plurality of zones, for example three, namely a head zone A, a cylinder and hopper zone B, and a screw zone C;
The extrusion molding machine is divided into two zones, and the three zones improve the quality of the extruded product, such as the cross-sectional shape and dimensions of the treaded rubber, by adjusting the rubber temperature according to the flow of the rubber in the extrusion molding machine 1. In order to improve the discharge capacity, each temperature is controlled to be a different target temperature. For example, head zone A is
At 90±2℃, cylinder and hopper zone B
is controlled to be 80±2°C, and screw zone C is controlled to be 70±2°C. 11a is the head zone A
is the first path of the closed circuit connected to the
A temperature fluid that heats and cools the head zone A and adjusts it to a target temperature is circulated within the passage 11a. A circulation pump 1 is provided in the middle of the first passage 11a.
2a and a heater 13a serving as a heater for heating the temperature control fluid are provided in series. Also, the first passage 11 between the pump 12a and the head zone A
A is provided with a side temperature pair 14a, for example a thermocouple, which measures the temperature of the head zone A by measuring the temperature of the temperature control fluid, and the measurement signal from this side temperature body 14a is the target temperature of the head zone A. is sent to a preset temperature controller 15a. When the temperature of the head zone A, that is, the temperature measured by the thermometer 14a, becomes lower than the target temperature, the temperature controller 15a sends a signal to the heater 13a and activates the heater 13a to heat the temperature regulating fluid. On the other hand, when the temperature of head zone A becomes higher than the target temperature, a signal to open the on-off valve, which will be described later, is sent to open the on-off valve. On the other hand, the first passage 11a between the heater 13a and the head zone A is provided with a sense bee 16a for preventing heating and a flow rate control valve 17a consisting of, for example, a stop valve. The first passage 11a and the bomb 12 described above
a, heater 13a, side heating body 14a, temperature controller 1
5a, sense bee 16a and flow control valve 17a
constitutes a temperature control means 18a for controlling the temperature of the head zone A as a whole. Furthermore, the cylinder, hopper zone B, and screw zone C are also provided with temperature control means 18b and 18c for individually controlling the temperature, and the configuration of each temperature control means 18b and 18c is the same as that of the temperature control means 18a. Although the structure is the same as that of , a detailed explanation will be omitted and each part will be shown in the drawing with the symbols b and c replaced. 21 is a second passage, and one end of this second passage 21 is connected to the first passages 11a, 11
b, 11c, that is, three, and the tip of each branching portion 22a, 22b, 22c is connected to the first passage 11 between the pump 12a, 12b, 12c and the temperature sensing element 14a, 14b, 14c.
a, 11b, and 11c, respectively.
On the other hand, the other end of the second passage 21 is also branched into three parts, and the tip of each branch part 23a, 23b, 23c is located between the tip of the branch part 22a, 22b, 22c and the pohemp 12a, 12b, 12c. 1
They are connected to passages 11a, 11b, and 11c, respectively. As a result, the second passage 21 is
This becomes a common bypass passage for passages 11a, 11b, and 11C. The branching portions 22a, 22
Flow control valves 24a, 24b, 24c, which are stop valves, for example, and on/off valves 25a, 25b, 2, which are, for example, electromagnetic valves, are opened and closed by temperature controllers 15a, 15b, 15c, respectively.
5c are provided in series. 26 is the second passage 2
1 cooling means provided in the center of the
This cooling means 26 cools the temperature regulating fluid that has flowed into the second passage 21 and returns it to the first passage. This cooling means 2
6 has a tank 27, and in this tank 27,
In order to prevent overshoot during cooling, a temperature regulating fluid for cooling is stored, which is maintained at a predetermined temperature that is, for example, 5 to 10 degrees Celsius lower than the minimum target temperature. In this way, since the tank 27 is provided in the control device, it becomes a buffer when a leak occurs in the circuit, and flexibility can be provided for repair. On the outlet side of the tank 27, there is a pump 2 that is constantly operating.
8 are connected in series, and an air-cooled cooler 29 is connected in series to the inlet side of the tank 27. 30 is a bypass passage whose both ends are connected to the central part of the second passage 21;
are connected in parallel to tank 27, pump 28 and cooler 29. As a result, the temperature regulating fluid in the tank 27 is constantly circulated through the bypass passage 30 by the operation of the pump. A restrictor 31 made of, for example, a needle valve is provided in the middle of the bypass passage 30 to prevent heating. 3
Reference numeral 2 denotes a bypass path which is connected in parallel to the cooler 29 and has a throttle 33 formed of, for example, a needle valve in the middle. Reference numeral 34 denotes a temperature measuring element, for example, a thermocouple type, which measures the temperature of the temperature regulating fluid in the tank 27, and a temperature measurement signal from this temperature measuring element 34 is sent to a temperature controller 35, which has been set at the predetermined temperature in advance. It will be done.
When the temperature of the temperature regulating fluid in the tank 27 becomes higher than a predetermined temperature, the temperature controller 35 sends a signal to the cooler 29 to rotate the fan and cool the circulating temperature regulating fluid.

Next, the operation of one embodiment of this invention will be explained.

When each zone A, B, C is at the target temperature, no signal is sent from the temperature controllers 15a, 15b, 15c, and the heaters 13a, 13b, 1
3c does not operate, and on-off valves 25a, 25b, 2
5c is closed. At this time, pump 12
a, 12b, 12c are in operation, the temperature regulating fluid at the target temperature flows through the first passages 11a, 11b, 11c.
circulating inside.

Further, when the head zone A is lower than the target temperature, such as at the start of extrusion, the temperature measuring element 14a measures the temperature of the temperature regulating fluid and sends it to the temperature controller 15a. A signal to activate the heater 13a is sent to the heater 13a. Thereby, the heater 13a heats the temperature regulating fluid in the first passage 11a to the target temperature. Then, when the head zone A reaches the target temperature, the operation of the heater 13a is stopped. Note that when the temperature of another zone becomes lower than the target temperature of the zone, the temperature control means is activated to perform temperature control in the same manner as described above.

Furthermore, when the temperature of the temperature control fluid in the head zone A becomes higher than the target temperature due to rubber heat generation in the cylinder and hopper zone B, the temperature measuring element 14a sends the measurement result to the temperature controller 15a,
Open the on-off valve 25a. As a result, a portion of the return fluid from the head zone A flows into the tank 27 from the first passage 11a through the branch portion 22a, mixes with the fluid in the tank 27 that has been cooled to a predetermined temperature, and is cooled. The temperature fluid cooled to approximately a predetermined temperature in this way is transferred to the branch portion 23
a and is returned to the first passage 11a again. As a result, the low-temperature temperature regulating fluid is mixed with the temperature regulating fluid in the first passage 11a, the temperature is lowered, and the head zone A is cooled. When the head zone A reaches the target temperature, the on-off valve 25a is closed. When the temperature inside the tank 27 becomes higher than a predetermined temperature due to the inflow of such high-temperature fluid, the temperature measurement 34 sends the measurement result to the temperature controller 35, and the fan of the cooler 29 is rotated. As a result, the temperature control fluid in the tank 27 is circulated through the bypass passage 30 and the cooler 2
9, the temperature is lowered to a predetermined temperature. In this way, the temperature control fluid in the tank 27 is always maintained at a predetermined temperature. Note that when the temperature of another zone becomes higher than the target temperature of that zone, the same operation as described above is performed and temperature control is performed.

Note that this invention can also be applied, for example, to a case where the temperature of heating rolls divided into a plurality of stages is individually controlled to different target temperatures. In such a case, control becomes easier if two or three zones in which the temperatures of the temperature regulating fluids are similar are integrated and controlled. Also, in this idea,
For example, only an air-cooled cooler may be used as the cooling means. Furthermore, in this invention, the second passage may be connected to the first passage in parallel to the heater. Further, in this invention, the number of zones may be 2 or 4 or more.

Effects of the invention As explained above, according to this invention, the entire device is downsized and the equipment cost is reduced.
Furthermore, no heat radiation loss occurs.

[Brief explanation of the drawing]

The drawing is a circuit diagram showing an embodiment of this invention. 11a, 11b, 11c...first passage, 13
a, 13b, 13c... Heater, 21... Second passage, 22a, 22b, 22c, 23a, 23b,
23c...branching part, 25a, 25b, 25c
...Opening/closing valve, 26...Cooling means, A, B, C...
zone.

Claims (1)

[Claims for Utility Model Registration] (1) A multi-zone temperature control device that individually controls the temperature of multiple zones with different target temperatures,
Connected to each zone and heats each zone,
a closed-circuit first passage through which a temperature-controlled fluid to be cooled circulates; a heater provided in the middle of each first passage to heat the temperature-controlled fluid in the first passage when the temperature of the corresponding zone becomes lower than a target temperature; , a second passage in which both ends are branched in the same number as the first passage, and both ends of these branches are respectively connected to the first passage; and a zone provided at each branched end of the second passage and corresponding thereto. an on-off valve that opens when the temperature becomes higher than the target temperature; and a second valve provided in the center of the second passage.
1. A multi-zone temperature control device comprising: one cooling means for cooling the temperature control fluid that has flowed into the passage and returning it to the first passage. (2) The cooling means includes a tank in which temperature control fluid for cooling is stored, a pump connected in series to the tank, a cooler connected in series to the tank, and a tank, pump, and cooler. and a bypass passage connected in parallel to the tank, and when the temperature of the temperature regulating fluid in the tank is detected and the temperature of the temperature regulating fluid reaches a predetermined temperature or higher, the temperature regulating fluid is circulated through the bypass passage and cooled by a cooler. A temperature control device for multiple zones according to claim 1, comprising: a temperature measuring body configured to be cooled;