JP2709566B2 - Heating medium heating and cooling device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating and cooling device for heating and cooling a heating medium for heating and cooling a heating plate outside the heating plate.

[0002]

2. Description of the Related Art Conventionally, in hot pressing of a resin plate, a process has been adopted in which a resin plate is pressed and heated by a hot press apparatus, and then cooled. In order to heat the hot press, the heat medium must be heated by a heating source. As the heating source, a steam boiler, an oil boiler, an electric heater, or the like is used.

Here, when a boiler is used as a heating source, so-called security standards for arranging the boiler must be cleared, and a boiler handling engineer must be stationed, which is troublesome. is there. On the other hand, when an electric heater is used, it is not necessary to have a manager such as a boiler handling engineer resident, and since electricity is used as clean energy that does not generate any pollution, it is suitable as a simple type. I have.

[0004]

However, a large amount of heat medium is structurally contained in the conventional heat medium heating / cooling apparatus, and such a large amount of heat medium is heated by an electric heater. So, when I try to send it to the hot press machine,
A large amount of electricity is required, and a solution is demanded from the viewpoint of energy saving. Also, it will take a lot of electricity bill,
A solution is also demanded from the viewpoint of economy.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and it is an object of the present invention to provide a heating medium heating / cooling apparatus which can achieve more energy saving as compared with the prior art. is there.

It is another object of the present invention to provide a heating and cooling device for a heat medium, which can improve the economic efficiency as compared with the prior art.

[0007]

Means for Solving the Problems To solve the problems described above,
Heating medium cooling device according to the present invention
In order to heat and cool the hot plate,
For heating and cooling the heat medium outside the hot plate
In the medium heating / cooling device, the first path through which the heat medium is passed.
Ip and was inserted into this first pipeElectric heater
Is fitted around the outer periphery of the first pipe so that the cooling water can pass therethrough.
And a second pipe.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The construction of an embodiment of a heating and heating device according to the present invention will be described below with reference to the case where the configuration of an embodiment of a heating and cooling device according to the present invention is applied to a hot press device for hot pressing a resin plate. This will be described with reference to FIG.

First, the hot press apparatus 10 shown in FIG.
As shown in FIG. 1, a hot press body 14 having a multi-stage hot plate 12, a heat medium supply system 16 for supplying a heat medium for heating and cooling each heat plate 12, and a heat medium And a heat medium heating / cooling device 18 which is a feature of this embodiment for heating / cooling.

The heat medium supply system 16 includes a first heat medium pipe 20 connecting a heat medium outlet 18A of the heat medium heating / cooling device 18 and a heat medium inlet 14A of the hot press body 14, 14 and a heat medium return port 18B of the heat medium heating / cooling device 18, a second heat medium pipe 22, and a feed pump 24 interposed in the second heat medium pipe 22. And a drive motor 26 for driving the feed pump 24, and a portion of the second conduit 22 between the feed pump 24 and the heat medium outlet 14B to absorb the expansion of the heat medium during heating. And an expansion tank 28 for performing the operation.

Here, the heating medium heating / cooling device 18
As will be described later in detail for heating the heat medium, an electric heater 30 is provided, and a cooling system 32 is provided for cooling the heat medium. The cooling system 32 includes a first cooling water pipe 34 connecting between a cooling water inlet 18C of the heating medium heating / cooling device 18 and a cooling water supply source (not shown);
A second cooling water pipe 36 connected to the cooling water discharge port 18D of the heat medium heating / cooling device 18, a first opening / closing valve 38 provided in the first cooling water pipe 34, and a second cooling water pipe Road 36
And a second on-off valve 40 interposed therebetween.

When the heat medium is changed from the cooling state to the heating state, the first opening / closing valve 38 and the cooling water inlet 18 are used to completely discharge the cooling water from the heat medium cooling device 18.
The first cooling water pipe 34 between C is connected to an air introduction pipe 42 connecting the first cooling water pipe 34 to an air supply source (not shown), and a third on-off valve 44 is provided here. I have. In addition, the second on-off valve 40 and the second between the cooling water discharge port 18D
Is connected to an air discharge port (not shown), and a fourth opening / closing valve 48 is interposed therebetween.

Next, the structure of the heat medium heating / cooling device 18 which is a feature of this embodiment will be described with reference to FIGS.

The heat medium heating / cooling device 18 includes a total of four heating / cooling units 50A to 50D, which are formed in a generally U-shape which is horizontally long in a front view, in two stages vertically and two stages deep. Each of the heating and cooling units 50A to 50D includes a substantially U-shaped first pipe 52 through which a heat medium passes, an electric heater 30 inserted into the first pipe 52, and a first
And a substantially U-shaped second pipe 54 fitted coaxially with the outer periphery of the pipe 52 through which cooling water passes. In addition, these four heating and cooling units 50A
50D are covered in a state where they are completely housed in the heat insulating cover 56. Also, both ends of the first pipe 52
The second pipe 54 is set to protrude outward from both ends thereof.

The first pipe 52 is an arc-shaped elbow connecting the first and second linear portions 52a and 52b and the respective distal ends of the first and second linear portions 52a and 52b to each other. And a portion 52c. The electric heaters 30 are located in the first and second linear portions 52a and 52b of each first pipe 52, respectively, and are substantially coaxial with each other and in a so-called rod shape so as to extend linearly. Is formed. Then, each electric heater 30 is fixed to each end of the first pipe 52, and each base end is further protruded outward, into a terminal box 58 attached adjacent to the heat insulating cover 56. Has been taken out.

A plurality of first steady rests 60 are attached to the outer peripheral surface of each electric heater 30, and these first steady rests 60 are formed so as to contact the inner peripheral surface of the first pipe 52. Thus, the vibration of the electric heater 30 during the flow of the heat medium is prevented. Also, a plurality of second steady rests 6 are provided on the outer peripheral surface of the first pipe 52.
2, the second steady rests 62 are formed so as to abut the inner peripheral surface of the second pipe 54, thereby preventing the first pipe 52 from swinging when the cooling water flows. It has been done.

As shown in FIG. 3, the outer peripheral surface of the projecting end of the first linear portion 52a above the first pipe 52 of each of the heating and cooling units 50A and 50C located above is provided with The one connecting pipes 64 are connected to each other, and the first connecting pipes 64 are connected by the first collecting pipe 66 and then connected to the above-described heat medium outlet 18A. Further, the heating / cooling units 50B, 5 located below
The second connecting pipe 6 is provided on the outer peripheral surface of the protruding end of the second linear portion 52b below each of the first pipes 52D of the first connecting pipe 6D.
8 are connected to each other, and the second connecting pipes 68 are connected by the second collecting pipe 70 and then connected to the above-described heat medium return port 18B.

Here, the lower second heating pipes 52 of the heating / cooling units 50A and 50C located above the second heating pipes 50A and 50C, respectively.
And the protruding end of the first linear portion 52a above the first pipe 52 of each of the heating and cooling units 50B and 50D located directly below the protruding end of the linear portion 52b.
They are connected to each other via a third connecting pipe 72.

Further, as shown in FIG. 4, each of the second pipes 5 of the heating / cooling units 50A and 50C located above
Fourth connecting pipes 74 are connected to the outer peripheral surface of the upper end of the fourth connecting pipes 74. After the fourth connecting pipes 74 are assembled by the third collecting pipe 76, the above-described cooling water outlet 1
8D. A fifth connecting pipe 78 is connected to the outer peripheral surface of the lower end of each of the second pipes 54 of the heating / cooling units 50B and 50D located below, and the fifth connecting pipe 78 is connected to the fourth connecting pipe 78 by the fourth connecting pipe 78. Are collected by the collecting pipe 80, and are connected to the cooling water inlet 18C described above. Here, the lower ends of the respective second pipes 54 of the heating and cooling units 50A and 50C located above and the heating and cooling units 50B and
The upper end of each second pipe 54 of 50D is connected to each other via a sixth connecting pipe 82.

The heating / cooling operation of the heating medium in the heating medium heating / cooling apparatus 18 configured as described above will be described below.

First, in the cooling operation, first, the power supply to the electric heater 30 is cut off, and the third and fourth on-off valves 4 are turned off.
4 and 48 are closed, the first and second on-off valves 3
Release 8,40. In this state, the cooling water from the cooling water supply source (not shown) sequentially flows from the cooling water inlet 18C through the first cooling water pipe 34 through the fourth collecting pipe 80 and the fifth connecting pipe 78. Then, it is introduced into the second pipe 54 and flows therethrough. On the other hand, when the feed pump 24 is driven, the heat medium flowing in the first pipe 52 located in the second pipe 54 is cooled by exchanging heat with the cooling water flowing in the second pipe 54. The heat medium thus cooled is supplied from the heat medium outlet 18A to the first heat medium.
Through the heat medium pipe 20 of the hot press main body 14 from the heat medium inlet 14A. Thus, the hot plate 12 is cooled. The second pipe 5
The cooling water flowing through the inside of the cooling medium 4 and contributing to the cooling of the heat medium is discharged from the cooling water discharge port 18D to the second cooling water pipe 36,
It is discharged from here.

When such a cooling operation is completed, an operation of discharging the cooling water from the heating medium heating / cooling device 18 is executed before a transition to the heating operation.

That is, the third and fourth on-off valves 44 and 48 are opened while the first and second on-off valves 38 and 40 are closed. In this state, compressed air is supplied from an air supply source (not shown) via the air introduction pipe 42. As a result,
The introduced air is introduced into the second pipe 54 from the cooling water inlet 18C via the fourth collecting pipe 80 and the fifth connecting pipe 78 in order. Thereby, the cooling water in the second pipe 54 is supplied to the cooling water outlet 1
From 8D, the cooling water is sequentially passed through the second cooling water pipe 36 and the air discharge pipe 46, and is discharged therefrom. In this way, the cooling water is completely removed from the heating medium cooling device 18.

Thereafter, the third and fourth on-off valves 44, 48
Of these, in a state where only the third on-off valve 44 is closed, each electric heater 30 is energized to generate heat. And by this, by the drive of the feed pump 24, the heat is returned from the second heat medium pipe 22 to the second collecting pipe 70 via the heat medium return port 18 </ b> B, and the second connection pipe 68 is connected via the second connecting pipe 68. The heat medium introduced into the first pipe 52 is heated by the electric heater 30 while flowing through the first pipe 52, and is heated to a predetermined temperature.

The heating medium thus heated is:
The heat medium is introduced into the hot plate 12 of the hot press body 14 from the heat medium inlet 14A through the heat medium outlet 18A through the first heat medium pipe 20. Thus, the hot plate 12 is heated.

In such a heating operation of the heat medium, as described above, the first pipe 52 through which the heat medium flows flows into the first pipe 52.
The electric heater 30 is provided except for the arc-shaped elbow portion 52c. As a result, the heat exchanger has a sufficient heat transfer area, and while a reliable heating operation is achieved,
Since the electric heater 30 is present in the first pipe 52, the cross-sectional area of the first pipe 52 through which the heat medium passes is reduced, so that the built-in amount (storage) of the heat medium in the first pipe 52 is reduced. Volume) becomes smaller. As a result, thermal efficiency is increased, and energy consumption is reduced. In addition, as a result, the electricity bill can be reduced, and the economy is improved.

As described above, in the heating operation and the cooling operation, the heat medium circulates in the same pipelines 20 and 22, so that the flow of the heat medium for heating and cooling the hot plate 12 is performed. There is no need to switch the road, and the configuration is simplified.

Further, the electric heater 30 is disposed in each of the first pipes 52 in a state of being divided into two. For this reason, even if it expands at the time of heat generation, its tip is set as a free end, so that expansion movement is allowed without any problem, and the tolerance for expansion at the time of heat generation is improved, and the design is improved. The degree of freedom of the shape increases.

The present invention is not limited to the configuration of the above-described embodiment, and can be variously modified without departing from the gist of the present invention.

For example, in the above-described embodiment, the first and second straight portions 52 are provided in each first pipe 52.
It has been described that two electric heaters 30 are provided corresponding to a and 52b, respectively. However, the present invention is not limited to such a configuration, and for example, is shown in FIGS. 5 and 6 as modified examples. As described above, a substantially U-shaped sheathed heater 84 set coaxially with the first pipe 52 may be used. With this configuration, the amount of the heat medium contained in the first pipe 52 is smaller than in the above-described embodiment, and the energy saving effect and the economic efficiency are improved.

[0031]

As described in detail above, according to the present invention,
The cross-sectional area of the first pipe through which the heat medium passes is set to be small by the heating means. Thereby, the volume of the heat medium passed through the first pipe is set to be small, so that the energy consumption for heating the heat medium set to have such a small volume can be reduced, and Electricity costs will be reduced.

As described above, according to the present invention, there is provided a heating medium heating / cooling apparatus capable of achieving more energy saving as compared with the prior art.

Further, according to the present invention, there is provided a heating medium heating / cooling apparatus capable of improving the economical efficiency as compared with the related art.

[Brief description of the drawings]

FIG. 1 is a front view schematically showing a configuration of a hot press apparatus to which a configuration of an embodiment of a heating medium heating / cooling apparatus according to the present invention is applied.

FIG. 2 is a front view specifically showing a configuration of the heating medium heating / cooling device shown in FIG.

FIG. 3 is a side sectional view showing a state in which the heat medium heating / cooling device shown in FIG. 2 is cut along line AA.

FIG. 4 is a side sectional view showing the heat medium heating / cooling device shown in FIG. 2 in a state cut along line BB.

FIG. 5 is a front view showing a configuration of a modification of the embodiment.

6 is a side sectional view showing a state in which the heat medium heating / cooling device shown in FIG. 5 is cut along the line CC.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Hot press apparatus 12 Hot plate 14 Hot press body 14A Heat medium inlet 14B Heat medium outlet 16 Heat medium supply system 18 Heat medium heating / cooling device 18A Heat medium outlet 18B Heat medium return port 18C Cooling water inlet 18D Cooling water Outlet 20 First heat medium pipe 22 Second heat medium pipe 24 Feed pump 26 Drive motor 28 Expansion tank 30 Electric heater 32 Cooling system 34 First cooling water pipe 36 Second cooling water pipe 38 First Opening / closing valve 40 second opening / closing valve 42 air introduction pipeline 44 third opening / closing valve 46 air discharge pipeline 48 fourth opening / closing valve 50A to 50D heating / cooling unit 52 first pipe 52a first linear portion 52b first 2 straight section 52c elbow section 54 second pipe 56 heat insulating cover 58 terminal box 60 first steady rest 62 2nd steady rest 64 1st connecting pipe 66 1st collecting pipe 68 2nd connecting pipe 70 2nd collecting pipe 72 3rd connecting pipe 74 4th connecting pipe 76 3rd collecting pipe 78th 5 connecting pipe 80 4th collecting pipe 82 6th connecting pipe 84 sheathed heater

Claims (6)

(57) [Claims] 1. A heating medium heating / cooling device for heating / cooling a heating medium for heating / cooling a heating plate outside of the heating plate, comprising: a first pipe through which a heating medium is passed; A heating medium heating and cooling device, comprising: an electric heater inserted into one pipe; and a second pipe fitted around the first pipe and through which cooling water is passed. 2. The heating medium heating and cooling device according to claim 1, wherein the first and second pipes are each formed in a U-shape. 3. The electric heater is provided inside a straight portion of the U-shaped first pipe, and is substantially the same as the straight portion.
The heating-medium cooling device according to claim 2, wherein the heating-medium heating and cooling device is a rod-shaped electric heater extending in a shaft . 4. The electric heater extends in a U-shape while passing through the first U-shaped pipe substantially coaxially therewith.
The heating medium cooling device according to claim 2, wherein the heating medium is a rod-shaped electric heater. 5. The heating medium heating / cooling apparatus according to claim 4, wherein the electric heater is a sheathed heater. 6. The heating and cooling medium according to claim 1, wherein the first pipe projects outward from both ends of the second pipe. apparatus.