JP2002122370A - Heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchanger which can prevent the temperature irregularity by suppressing the pressure fluctuation within a heat-exchanging chamber. SOLUTION: Executers 5 and 6 are arranged within the heat exchanging chamber 11 within a roll 1. A cooling fluid supply pipe 2 is connected to the inlet side of the ejectors 5 and 6, and a fluid discharge pipe 4 is connected to the outlet side. Suction pipes 18 and 19 are attached to the suction parts 14 and 15 of the ejectors 5 and 6. Vapor which is supplied to the heat- exchanging chamber 11 and is evaporated is sucked immediately in the pipe 19, and the residual cooling fluid is sucked in the pipe 18.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchange apparatus for heating or cooling a heat exchange chamber at a relatively low temperature with a suction means at a low pressure.

[0002]

2. Description of the Related Art As a conventional heat exchange device, for example, a rotary cooling device disclosed in JP-A-6-238677 has been used. It comprises a roll having a rotating part, a coolant supply part for supplying a coolant to the inside of the roll, and a coolant discharge part comprising a siphon pipe and suction means for discharging the coolant from the inside, and the roll By evaporating the cooling liquid inside, the object to be cooled is vaporized and cooled with a large heat transfer rate, and the occurrence of cooling unevenness can be prevented.

[0003]

However, even with the above-mentioned conventional heat exchanger, there has been a problem that it is not possible to reliably prevent uneven cooling. This is because, when the vaporized vapor of the cooling liquid inside the roll is sucked by the suction means through the siphon pipe and the cooling liquid discharge pipe, the amount of vaporized vapor generated fluctuates due to the small diameter of these pipes. If it increases, the pipeline resistance will increase, and it will not be possible to reliably suck the increased amount of vaporized steam.
The pressure inside the roll fluctuates, and as a result, the temperature inside the roll as the heat exchange chamber fluctuates, causing uneven cooling.

[0004] In view of this situation, the main problems of the present invention are:
Provided is a heat exchange device capable of suppressing pressure fluctuation in a heat exchange chamber and preventing temperature unevenness by minimizing a pipe resistance from a heat exchange chamber to a suction unit without increasing a pipe diameter. It is.

[0005]

The invention according to claim 1 is
A heat exchange chamber is connected to a fluid supply pipe for supplying a heat exchange fluid to the heat exchange chamber, and at least one of the suction means is connected to the heat exchange chamber. The suction means is formed by at least an ejector, and the ejector is disposed in the heat exchange chamber. In addition, the heat exchange device has an inlet of the ejector connected to a heat exchange fluid supply pipe and an outlet of the ejector connected to a heat exchange fluid discharge pipe.

By disposing the ejector in the heat exchange chamber, there is no need to connect the heat exchange chamber and the ejector as suction means by a siphon tube or a communication line, and the line resistance between the two is minimized. Things.

[0007] Since the inlet side of the ejector is connected to the heat exchange fluid supply pipe and the outlet side of the ejector is connected to the heat exchange fluid discharge pipe, the fluid in the heat exchange chamber sucked by the ejector flows from the inlet of the ejector. While flowing down to the outlet, it is mixed with the heat exchange fluid and discharged from the fluid discharge pipe.

[0008] When the fluid in the heat exchange chamber is vaporized vapor of cooling water, the vaporized vapor sucked into the ejector is mixed with the cooling water as the heat exchange fluid and condenses, and the volume is reduced to reduce the volume of the fluid discharge pipe. From the heat exchange chamber.

The large-volume steam is condensed and discharged as small-volume cooling water to the outside of the heat exchange chamber without being discharged from the inside of the heat exchange chamber, thereby connecting the inside and outside of the heat exchange chamber. There is no need to make the pipe diameter large, and the pipe resistance can be made small,
Pressure fluctuation in the heat exchange chamber can be suppressed to prevent temperature unevenness.

According to a second aspect of the present invention, in carrying out the first aspect of the invention, a cooling fluid such as cooling water or a refrigerant is supplied as a heat exchange fluid to be supplied to the heat exchange chamber.

[0011] By using a cooling fluid as the heat exchange fluid, the object to be heat exchanged can be cooled.

According to a third aspect of the present invention, a heating fluid such as steam or a heat medium is supplied as a heat exchange fluid in the first embodiment.

By using a heating fluid as the heat exchange fluid, it is possible to heat the heat exchange target.

According to a fourth aspect of the present invention, in implementing the invention according to any one of the first to third aspects, at least one of the suction portions of the ejector disposed in the heat exchange chamber is provided near the inside of the heat exchange chamber. It is the one that opens to.

Since the suction section of the ejector is opened near the inside of the heat exchange chamber, the fluid inside the heat exchange chamber is sucked by the suction section of the ejector, and excessive fluid stays inside the heat exchange chamber. There is no.

When evaporative cooling is performed by supplying cooling water into the heat exchange chamber, the evaporative cooling temperature can be maintained at a predetermined constant value without excessive cooling water staying inside the heat exchange chamber. it can.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In this embodiment, an example is shown in which a roll 1 is used as a heat exchange device. In FIG. 1, a rotatable roll 1, a cooling fluid supply pipe 2 as a heat exchange fluid supply pipe, a fluid discharge pipe 4, ejectors 5 and 6 disposed inside the roll 1, and a fluid discharge pipe 4 A heat exchange device is constituted by the tank 7 and the fluid pump 8 disposed between the pipes 2.

The roll 1 has a hollow cylindrical shape and is provided with rotary joints 9 and 10 at the left and right central portions. The rolls 1 are arranged so that the rolls 1 can rotate continuously about the rotary joints 9 and 10. The heat exchange object (not shown) contacts the outer surface of the roll 1 and exchanges heat.

The inside of the hollow cylindrical roll 1 is connected to the heat exchange chamber 1.
Ejectors 5 and 6 are arranged as 1. Ejector 5, 6
Is composed of suction units 14 and 15 having nozzles (not shown) and diffusers 16 and 17. The suction portions 14 and 15 as the inlet sides of the ejectors 5 and 6 are connected to the cooling fluid supply pipe 2 as the heat exchange fluid supply pipe via the communication pipe 13 and the heat exchange fluid jetting section 12.

Pipes 18 and 19 are attached to the suction sections 14 and 15 of the ejectors 5 and 6, respectively. The lower end opening 20 of the pipe 18 is disposed inside the heat exchange chamber 11 with a slight gap. On the other hand, the upper openings 21 and 22 of the pipe 19
Is disposed inside the heat exchange chamber 11 and away from the inner periphery of the heat exchange chamber 11.

The diffusers 16, 17 of the ejectors 5, 6
Is connected to the fluid discharge pipe 4 via the communication pipe 23. The fluid discharge pipe 4 is connected to a suction portion 2 of a fluid pump 8 through a tank 7.
Connect to 4. The discharge part 25 of the fluid pump 8 communicates with the cooling fluid supply pipe 2 and connects to the ejectors 5 and 6.

In the upper part of the tank 7, a cooling fluid supply pipe 26
And the overflow pipe 27 is connected.
The fluid pump 8 sucks the fluid in the tank 7 and discharges the fluid to the cooling fluid supply pipe 2.

The heat exchange fluid injection section 12 disposed between the cooling fluid supply pipe 2 and the ejectors 5 and 6 has a hollow cylindrical shape and is provided with a number of fluid injection nozzles 28 on the outer periphery. Fluid accumulated inside the heat exchange fluid jetting unit 12 flows from the nozzle 28 to the heat exchange chamber 1.
1 is injected inside.

When cooling the object to be cooled (not shown) on the outer surface of the roll 1, the fluid pump 8 is driven while rotating the roll 1, and the heat exchange fluid jetting unit 1 is supplied from the cooling fluid supply pipe 2.
The cooling fluid is supplied into the roll 1 through two nozzles 28.

The remaining cooling fluid of the heat exchange fluid injection unit 12 is supplied to the ejectors 5 and 6 and generates suction at the suction units 14 and 15. Since this suction force is determined by the temperature of the cooling fluid flowing down in the ejectors 5, 6, the suction force can be adjusted by appropriately controlling the fluid temperature. By setting the fluid temperature to 100 ° C. or higher, the pressure can be set to a pressure higher than the atmospheric pressure, or by setting the fluid temperature to 100 ° C. or lower, the pressure can be reduced to the atmospheric pressure or lower.

The internal pressure of the heat exchange chamber 11 is
6 is almost equal to the pressure generated. When the internal pressure of the heat exchange chamber 11 is reduced to the atmospheric pressure or less, the supplied cooling fluid takes away the heat of the object to be cooled and evaporates immediately, thereby causing the object to be cooled to a temperature of 100 ° C. or less. Cooled.

The steam vaporized by removing heat is mainly discharged from the ejector 6.
Is sucked into the suction unit 15 from the pipe 19, and is mixed with the cooling fluid to become a liquid and reaches the tank 7. On the other hand, the cooling fluid located inside the heat exchange chamber 11 without being vaporized is sucked from the pipe 18 of the ejector 5 and reaches the tank 7.

By disposing the lower end opening 20 of the pipe 8 at a small distance on the inner periphery of the roll 1, the film thickness of the cooling fluid inside the heat exchange chamber 11 is made equal to this distance and constant. The cooling temperature of the entire roll 1 can be maintained uniform.

Next, another embodiment is shown in FIG. FIG. 1
The same reference numerals are given to the same members. In FIG. 2, a heating fluid supply pipe 3 as a heat exchange fluid supply pipe communicates with a heating fluid source (not shown) such as steam through an automatic control valve 29 and a valve 30. The heating fluid supply pipe 3 is connected to the suction part 32 of the ejector 31 via the communication pipe 13.

A heating fluid injection pipe 34 is attached to the communication pipe 13 via an opening adjustment valve 33. The heating fluid, such as steam, supplied from the heating fluid supply pipe 3 is injected into the heat exchange chamber 11 with the amount adjusted by the valve 33.

The suction portion 32 of the ejector 31 has a pipe 36
And the lower end opening thereof is arranged at a slight distance from the inner periphery of the roll 1. Diffuser 35 of ejector 31
Is connected to the discharge pipe 4 via the communication pipe 23.

When the object to be heat-exchanged is heated by the roll 1, for example, steam is adjusted to a desired pressure or temperature from the heating fluid supply pipe 3 and supplied to the heat exchange chamber 11 from the injection pipe 34. Can be. The steam deprived of heat by heating is condensed and condensed, and accumulates at the bottom of the heat exchange chamber 11.

The remainder of the steam supplied from the communication line 13 is supplied to the ejector 31 to generate suction, and the pipe 36
And the inside of the heat exchange chamber 11 is maintained at a reduced pressure below a predetermined atmospheric pressure. Therefore, as in the case of the cooling shown in FIG. 1, the inside of the roll 1 can be kept in a reduced pressure state, and the low-temperature heating of 100 ° C. or less can be performed by the reduced pressure steam.

In the present embodiment, a heat exchange fluid injection section 12 for injecting a cooling fluid into the heat exchange chamber 11 is connected to a communication pipe 13.
Although the example shown in FIG. 3 was shown, it is also possible to provide an injection hole in the communication pipe 13 to perform injection. Further, this injection hole can be provided in the communication pipe 23 on the outlet side of the ejectors 5 and 6.

In this embodiment, the ejectors 5
The pipes 18, 19 and 36 provided in
Although the example of the book is shown, a plurality of books can be provided.

In this embodiment shown in FIG. 1, an example is shown in which the tank 7 and the fluid pump 8 are used. However, if a cooling fluid of a predetermined temperature can be supplied to the ejectors 5, 6, the tank 7 and the fluid pump 8 can be used. The pump 8 is not always necessary.

It is also possible to arrange an indirect heat exchanger in place of the tank 7 and adjust the temperature of the cooling fluid supplied to the ejectors 5 and 6 as appropriate.

In this embodiment, the temperature at which the heat or cooling heat exchange is performed is set to 100 ° C. or less.
By setting the pressure generated in the ejectors 5, 6, 31 to be equal to or higher than the atmospheric pressure, the heat exchange temperature can be set to 100 ° C. or higher.

[0039]

According to the present invention, by arranging an ejector as a suction means in a heat exchange chamber, the pipe resistance from the heat exchange chamber to the suction means can be made substantially zero.
Pressure fluctuation in the heat exchange chamber can be suppressed to prevent temperature unevenness.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional configuration diagram showing an embodiment of a heat exchange device of the present invention.

FIG. 2 is a partial sectional configuration view showing another embodiment of the heat exchange device of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Roll 2 Cooling fluid supply pipe 3 Heating fluid supply pipe 4 Heat exchange fluid discharge pipe 5,6,31 Ejector 8 Fluid pump 11 Heat exchange chamber 13 Communication pipeline 14,15,32 Suction unit 18,19,36 Pipe 23 Communication Pipe line 34 Heated fluid injection pipe

Claims (4)

[Claims] A heat exchange chamber for exchanging heat with an object to be heat-exchanged, a fluid supply pipe for supplying a heat exchange fluid to the heat exchange chamber, and the heat exchange chamber communicating with a suction means; Is formed by at least an ejector, the ejector is arranged in a heat exchange chamber, an inlet side of the ejector is connected to a heat exchange fluid supply pipe, and an outlet side of the ejector is connected to a heat exchange fluid discharge pipe. Heat exchange equipment. 2. The heat exchange device according to claim 1, wherein a cooling fluid such as cooling water or a refrigerant is supplied as the heat exchange fluid. 3. The heat exchange device according to claim 1, wherein a heating fluid such as steam or a heat medium is supplied as the heat exchange fluid. 4. The heat exchange apparatus according to claim 1, wherein at least one of the suction portions of the ejector disposed in the heat exchange chamber is opened near the inside of the heat exchange chamber.