KR20120124043A - Induction heating roller device - Google Patents

Abstract

PURPOSE: An induced heating roller device is provided to control the corrosion of a roller main body by providing cooling medium in a gap part of a pipe shape which is formed between a roller main body and an induced heating tool. CONSTITUTION: An induced heating tool(3) is arranged inside a roller main body which is supported to be rotated. A cooling tool(8) provides cooling medium to a gap part formed between the roller main body and the induced heating tool. A liquid medium displacing tool(9) discharges fluid cooling medium remaining in the inner side of the roller main body to outside the roller main body. The liquid medium displacing tool comprises a liquid medium discharge pipe which is extended to the outside the roller main body. The liquid medium displacing tool comprises an absorption pump which absorbs the fluid cooling medium from an absorption port. [Reference numerals] (821) Air; (831) Water; (AA) Shaft direction; (BB) Remaining water

Description

Induction heating roller device {INDUCTION HEATING ROLLER DEVICE}

The present invention relates to an induction heating roller device, and more particularly to an induction heating roller device having excellent cooling performance.

Conventionally, for example, rotation is performed in a continuous heat treatment process of a sheet material such as a plastic film, paper, cloth, nonwoven fabric, synthetic fiber, metal foil, or a continuous material such as a web material or a wire material. An induction heating mechanism is used in which an induction heating mechanism is arranged inside the roller body, thereby generating a heat generated by the induction current in the peripheral wall of the roller body.

In recent years, there has been a request to change the heating temperature by the roller body accompanying changing the type of the continuous material in a short time. Moreover, if the temperature of the roller body does not fall below a fixed temperature from the viewpoint of safety hygiene after the completion of the stretching treatment step, the worker cannot fall from the position. From such a thing, it is necessary to cool a roller main body in a short time as possible.

In addition, the induction heating roller device may be used not only for heating the continuous material but also for cooling, and it is necessary to give the induction heating roller device a cooling function.

As described above, the induction heating roller device has a cooling function. As shown in Patent Literature 1, a plurality of cooling medium passages are provided in the circumferential wall of the roller body along the central axis direction and at equal intervals in the circumferential direction. It is considered to cool the roller body by circulating the cooling medium in the cooling medium passage.

However, in order to circulate the cooling medium in the cooling medium passage, it is necessary to supply the cooling medium from the outside through the shaft portion (journal portion) provided integrally with the roller body or the end thereof, and the roller body or the journal portion thereof is a rotating body. A rotary seal mechanism called a rotary joint or a mechanical seal is required. In this case, since all of the contact seal mechanisms are used, the problem of leakage of the cooling medium is inevitable with the progress of wear of the seal portion, thermal degradation, or chemical degradation. In order to avoid such a problem, it is necessary to periodically repair or replace the rotary seal mechanism. Naturally, the induction heating roller device must be stopped for such repair or replacement, and the cost of repair or replacement is incurred.

On the other hand, as the structure which does not use a contact seal mechanism, as shown in patent document 2, the refrigerant introduction mechanism which introduces a cooling medium in the inside of a roller main body, and the cooling medium introduce | transduced by the said refrigerant introduction mechanism are used as a roller body. Equipped with a refrigerant dispersing mechanism dispersed in the form of water droplets toward the inner circumferential wall, the roller body is cooled by latent heat of vaporization (heat of vaporization) when the scattered cooling medium is in contact with the inner circumferential wall of the roller body I can think of doing. The refrigerant dispersing mechanism has a discharge tube provided extending from one end to the other end of the inner circumferential wall of the roller body along the axial direction and disperses the cooling medium in a droplet form from the discharge port provided on the side wall of the discharge tube. . With such a configuration, by providing the refrigerant introduction mechanism and the dispersion mechanism in a part of the induction heating mechanism held in a stopped state inside the roller body, the rotary seal mechanism is not necessary at all, and the leakage of the cooling medium, maintenance, The trouble of exchange is prevented.

However, since the cooling medium is directly distributed on the inner circumferential wall of the roller body, impurities or non-evaporation components contained in the cooling medium are deposited on the inner circumferential wall of the roller body.

Specifically, for example, when the refrigerant is water, impurities such as calcium carbonate components or non-evaporation components deposit on the inner circumferential wall of the roller body, or the roller body corrodes or causes rust at the site for the dissolved chlorine component. For example, if the cooling medium is an organic oil, pyrolyzed carbides are deposited on the inner circumferential wall of the roller body. In addition, when the cooling medium contains chemically corrosive components, the inner circumferential wall of the scattered roller body is corroded and the thickness thereof becomes thin.

In addition, since the discharge pipe of the refrigerant dispersing mechanism is configured so that the cooling medium is spread through the minute holes, dust or the like contained in the cooling medium may be blocked by the minute holes and the dispersing mechanism may be clogged. There is a problem in that it is necessary to disassemble and replace the discharge pipe.

Moreover, in the induction heating roller device, the use of the continuous material as a heating roller for the purpose of heating and the use of the cooling material for the purpose of cooling the continuous material may occur alternately. In this case, in the case of using as a heating roller after being used as a cooling roller, the cooling medium remaining in the discharge pipe of the refrigerant dispersing mechanism is heated by heat transfer from the roller body, which may cause boiling in some cases. There is.

[Patent Document 1] Japanese Patent Application Laid-Open No. 2000-353588 [Patent Document 2] Japanese Patent Application Laid-Open No. 2003-269442

Under such circumstances, the inventors of the present invention contemplate distributing a cooling medium in a mist state between the roller body and the induction heating mechanism.

However, when the cooling medium in the mist state is supplied between the roller body and the induction heating roller device, it has been found that a problem occurs that the liquid cooling medium remains inside the roller body. When the remaining liquid cooling medium comes into contact with the induction coil of the induction heating mechanism, problems such as deterioration of insulation of the induction coil may occur, or the induction heating mechanism may be corroded.

Therefore, the present invention has been made to solve the above problems at once, and there is no need to provide a rotary seal mechanism on the roller body, while cooling the roller body while suppressing corrosion of the roller body, and in addition, the liquid cooling medium in the roller body. The main aim is to prevent the residue from remaining.

That is, the induction heating roller device according to the present invention, between the roller body rotatably supported, the induction heating mechanism disposed inside the roller body, and induction heating of the roller body, between the roller body and the induction heating mechanism A cooling mechanism for distributing an intangible cooling medium in a substantially cylindrical gap formed in the cylindrical body, and a liquid medium discharge mechanism for discharging the liquid cooling medium remaining inside the roller body to the outside of the roller body. Characterized in having a.

In this case, by introducing a free cooling medium into the roller body, the latent heat of vaporization when the free cooling medium contacts the inner circumferential wall of the roller body and evaporates and the sensible heat when the free cooling medium rises in temperature at the gap portion. (Iii) and latent heat at the time of vaporization evaporation can cool the roller body and the induction heating mechanism. In addition, since a free cooling medium is used, the cooling medium in contact with the roller body can be reduced, and corrosion of the inner wall of the roller body, deposition of impurities, and the like can be suppressed. In addition, since the liquid cooling medium remaining inside the roller body is discharged, the liquid cooling medium gathers inside the roller body so that the liquid cooling medium is in contact with the induction coil of the induction heating mechanism and the insulation deteriorates. This can solve problems such as corrosion of the instrument.

The liquid medium discharge mechanism is provided with a suction port in the lower portion of the gap portion and the liquid medium discharge pipe extending to the outside of the roller body, and provided on the liquid medium discharge pipe outside the roller body to suck the liquid cooling medium from the suction port It is preferable to have a suction pump. In this case, the liquid cooling medium remaining in the roller body can be discharged by the suction pump provided outside the roller body, and the structure inside the roller body can be simplified.

It is preferable that the suction pump sucks the liquid cooling medium from the suction port while the free cooling medium is passed through the clearance portion by the cooling mechanism.

The liquid medium discharge mechanism includes a liquid level sensor for detecting the liquid level of the liquid cooling medium remaining in the gap portion, and the liquid level of the liquid cooling medium has become a predetermined level or more by a detection signal obtained by the liquid level sensor. In this case, it is preferable that the suction pump sucks the liquid cooling medium from the suction port.

According to the present invention configured as described above, the roller body is cooled by supplying a free-form cooling medium to a substantially cylindrical gap formed between the roller body and the induction heating mechanism. Thus, a rotary seal mechanism is provided on the roller body. It is not necessary to do this, and the roller body can be cooled while suppressing corrosion of the roller body.

1 is a cross-sectional view of an induction heating roller device according to an embodiment of the present invention.
2 is a view showing the arrangement of the liquid medium discharge pipe and the temperature sensor of the same embodiment;
3 is a sectional view of an induction heating roller device according to a modified embodiment;

EMBODIMENT OF THE INVENTION Below, one Embodiment of the induction heating roller apparatus which concerns on this invention is described with reference to drawings.

The induction heating roller device 100 according to the present embodiment is, for example, in a continuous heat treatment step of a continuous material such as a sheet material or web material such as plastic film, paper, cloth, nonwoven fabric, synthetic fiber, metal foil, wire (thread) material, or the like. It is used.

Specifically, as shown in FIG. 1, the roller body 2 is rotatably supported, and the induction heating mechanism 3 accommodated in the roller body 2 is provided.

The journal 41 is attached to both ends of the roller main body 2 via seal members S1, such as an O-ring. The seal member S1 prevents leakage of the below-mentioned free or liquid cooling medium to the outside. Moreover, the journal 41 is comprised integrally with the hollow drive shaft 42, The drive shaft 42 is rotatably supported by the base 52 via the bearing 51, such as a roller bearing. . And the roller main body 2 is comprised so that it may rotate by the drive force supplied from the exterior, for example by rotation drive mechanisms (not shown), such as a motor.

The induction heating mechanism 3 is composed of a cylindrical iron core 31 having a cylindrical shape, and an induction coil 32 wound around the outer circumferential surface of the cylindrical iron core 31. Support shafts 6 are attached to both ends of the cylindrical iron core 31, respectively. The support shaft 6 is inserted into the drive shaft 42, respectively, and is rotatably supported with respect to the drive shaft 42 via a bearing 7 such as a roller bearing. As a result, the induction heating mechanism 3 is kept stationary with respect to the roller body 2 inside the rotating roller body 2. A lead wire L2 is connected to the induction coil 32, and an AC power supply V for applying an AC voltage is connected to the lead wire L2. In addition, a seal mechanism S2 such as an oil seal or a labyrinth seal is provided between the outer surface of the support shaft 6 and the inner surface of the drive shaft 42 to prevent the free cooling medium from leaking to the outside. It consists.

When an AC voltage is applied to the induction coil 32 by the induction heating mechanism 3, an alternating magnetic flux is generated, and the alternating magnetic flux passes through the side circumferential wall 21 of the roller body 2. . This passage generates an induced current in the roller body 2, and the roller body 2 generates Joule heat by the induced current.

However, the induction heating roller device 100 of the present embodiment discharges the cooling mechanism 8 for cooling the roller body 2 and the induction heating mechanism 3 and the liquid cooling medium remaining in the roller body 2. A liquid medium discharge mechanism 9 is provided.

As shown in FIG. 1, the cooling mechanism 8 has an axial direction of a substantially tubular clearance X formed between the roller body 2 and the induction heating mechanism 3 with an intangible cooling medium. The roller body 2 and the induction heating mechanism 3 are cooled by introducing them from one end and discharging the cooling medium from the other end in the axial direction X to the outside of the roller body 2. In addition, an axial direction is a paper left-right direction, as shown by the arrow of FIG.

Specifically, it is a mist generating device 81 for generating a free cooling medium, a compressed air supply circuit 82 for supplying compressed air to the mist generating device 81, and water as a cooling medium in the mist generating device 81. A cooling medium supplying circuit (83) for supplying the cooling medium; A cooling medium deriving passage 85 is provided for drawing the cooling medium passing through the part X to the outside from the other end in the axial direction.

The clearance part X has airtightness, and is mainly a rough cylindrical clearance X1 and roller body 2 formed by the inner peripheral wall surface of the roller body 2 and the outer peripheral surface of the induction heating mechanism 3. It consists of a roughly annular clearance X2 formed by the inner surface of the journal 41 provided in the both ends, and the axial cross section of the induction heating mechanism 3.

The mist generating device 81 mixes the compressed air from the compressed air supply circuit 82 with the water from the cooling medium supply circuit 83 to generate a free (mist state) cooling medium. This free cooling medium has a particle diameter such that it does not evaporate and evaporate immediately after being injected, and also a particle diameter such that it does not liquefy by falling due to gravity or colliding with a wall at the bent portion of the flow path during transport with air. . Specifically, the free cooling medium has a particle diameter in the range of 30 ~ 100㎛.

The compressed air supply circuit 82 includes a compressed air source 821, a compressed air pipe 822 having one end connected to the compressed air source 821, and the other end connected to a mist generating device 81, and the compressed air. It is provided on the piping 822, and is provided with the opening-closing valve 823 which controls supply and stop of compressed air to the mist generating apparatus 81. As shown in FIG.

The cooling medium supply circuit 83 includes a water storage tank 831, a cooling medium pipe 832 having one end connected to the water storage tank 831, and the other end connected to the mist generating device 81, and the cooling. A mist generating apparatus provided on the medium pipe 832 and provided downstream of the flow regulating valve 833 for adjusting the flow rate of the cooling medium supplied to the mist generating apparatus 81 and the flow regulating valve 833. An on / off valve 834 for controlling the supply and stop of the cooling medium to the 81 is provided.

The flow regulating valve 833 provided on the cooling medium pipe 832 receives a detection signal of the temperature sensor 2T embedded in the circumferential wall of the roller body 2 and applies a voltage applied to the induction coil 32. The controlling unit C detects a temperature signal indicating the circumferential wall temperature of the roller body 2 as a current signal through the amplifier A, and adjusts the flow rate of the cooling medium. Thereby, it is comprised so that the supply amount of a free cooling medium may be adjusted steplessly according to the circumferential wall temperature of the roller main body 2, and the cooling rate and cooling performance of the roller main body 2 can be adjusted easily. Can be. In addition, the detection signal from the temperature sensor 2T is output to the control unit C by the rotary transformer 10.

The cooling medium introduction passage 84 includes a pipe 84T and a cylindrical iron core 31 provided inside the support shaft 6 (hereinafter referred to as 6B) provided at the other end of the induction heating mechanism 3. It is comprised by the hole provided in the support shaft 6 provided hereafter (this support shaft shall be 6 A hereafter). Specifically, the cooling medium introduction passage 84 extends from the other supporting shaft 6B to the proximal end of the supporting shaft 6A through the inside of the induction heating mechanism 3, and supports the supporting shaft 6A. The opening on the downstream side of the cooling medium introduction passage 84 communicates with one end in the axial direction of the gap X by the through hole 61H at the base end portion of the gap. Moreover, the discharge port 81s of the mist generating apparatus 81 is mounted in the pipe 84T so that the discharge port 81s of the mist generating apparatus 81 may face the inside of the pipe 84T. Thus, the mist generating apparatus 81 is provided in the position which can be easily attached or detached from the induction heating roller apparatus 100 at the time of a problem such as clogging. In addition, the pipe 84T and the mist generating device 81 are detachably attached via a seal structure (not shown).

The cooling medium introduction passage 84 communicates with the gap X through the plurality of through holes 61H at the proximal end of the support shaft 6A (the end on the side of the induction heating mechanism 3). The through hole 61H forms an opening on the downstream side of the cooling medium introduction path 84. 61H of these through-holes are arrange | positioned at the axial end part (gap X2 in this embodiment) of clearance part X, and are formed in multiple radial intervals in the radial direction from support shaft 6A. .

The cooling medium derivation passage 85 is constituted by a cooling medium derivation tube 85T provided along the inside of the support shaft 6 provided at the other end of the induction heating mechanism 3. The cooling medium lead pipe 85T is provided by being inserted into the hollow portion formed along the central axis in the support shaft 6B, and is provided at the proximal end of the support shaft 6B (the end on the side of the induction heating mechanism 3). The opening is opened toward the portion X, and the opening is an upstream opening of the cooling medium lead-out passage 85. And this upstream opening is arrange | positioned at the other axial end part (gap X2 in this embodiment) of clearance part X. As shown in FIG. Moreover, the lead wire L2 connected to the induction coil 32 mentioned above is also provided in the hollow part of the support shaft 6B.

Moreover, the pressure reduction device 86 which pressure-reduces the clearance part X on the cooling medium lead-out pipe 85T outside the support shaft 6B is provided. The decompression device 86 depressurizes the inside of the gap X by sucking air from the upstream side of the cooling medium discharge pipe 85T and discharging it to the outside. As a result, the gap X is depressurized, whereby the free cooling medium introduced into the gap X easily evaporates, the roller body 2 is easily cooled, and the vaporized cooling medium is rolled. Condensation on the inner circumferential wall of the main body 2 and the induction heating mechanism 3 can be made difficult. In addition, the decompression device 86 is configured such that the free cooling medium passes the gap X at a predetermined flow rate. Specifically, when the flow rate of the free-form cooling medium in the gap portion X is 0.3 m / s or more, high thermal conductivity can be obtained, and the cooling efficiency of the roller body can be largely structured.

In addition, since the free cooling medium is supplied to the gap portion X as described above, the member surface forming the gap portion X, specifically, the inner circumferential wall surface of the roller body 2, the inner surface of the journal 41, and the like. Antirust treatment is performed on the outer circumferential surface of the support shaft 6. In addition, on the outer circumferential surface of the induction heating mechanism 3, the waterproof membrane F is provided over the entire surface in order to prevent electrical failure caused by the cooling medium. This waterproof film F is necessary when condensation is concerned in the relationship between the dew point temperature determined by the mist concentration inside the roller body 2 and the induction heating mechanism 3 during the cooling operation. When it is clear that the temperature of (3) is more than the said dew point temperature, it can omit.

Next, the liquid medium discharge mechanism 9 will be described.

The liquid medium discharge mechanism 9 discharges the liquid cooling medium (hereinafter also referred to as residual water) remaining inside the roller body 2 to the outside of the roller body 2, and discharges the liquid cooling medium. A liquid medium discharge pipe 91, a suction pump 92 provided on the liquid medium discharge pipe 91, a liquid level sensor 93 for detecting a liquid level of the liquid cooling medium in the roller body 2; And a pump control unit 94 for controlling the suction pump 92 by the detection signal from the liquid level sensor 93.

The liquid medium discharge pipe 91 is provided so that the suction port 91a, which is a front end opening, is disposed below the gap portion X and extends to the outside of the roller body 2. Specifically, as shown in FIG. 1, the liquid medium discharge pipe 91 is introduced into one end portion of the gap X in the axial direction (gap X2 in the present embodiment) from one support shaft 6A. As shown in FIG. 2, the suction port 91a is disposed at the lowermost end of the gap portion X, and the lower end of the outer peripheral surface of the induction heating mechanism 3 and the inner circumference of the roller body 2 at the lowermost end thereof. It is arranged between the bottom of the face. As shown in FIG. 1, the liquid medium discharge pipe 91 passes through one support shaft 6A and the cylindrical iron core 31 and the other support shaft 6B to the outside of the roller body 2. It is provided to extend.

The suction pump 92 is provided on the liquid medium discharge pipe 91 outside the roller body 2 to suck residual water from the suction port 91a, and is controlled by the pump controller 94 described later.

The liquid level sensor 93 is introduced from the other support shaft 6B to the other end in the axial direction of the gap X (gap X2 in the present embodiment), and as shown in FIG. 2, the gap part ( It is arrange | positioned at the lowest end of X), and detects the liquid level of the residual water between the lower end of the outer peripheral surface of the induction heating mechanism 3, and the lower end of the inner peripheral surface of the roller body 2 in the said lowest end. Specifically, the liquid level sensor 93 detects the liquid level of the residual water having a height that does not contact the induction coil 32 of the induction heating mechanism 3 inside the roller body 2. As the liquid level sensor 93, for example, a float type, an ultrasonic type, a capacitive type, an optical type or a pressure type one may be used.

When the pump control part 94 consists of a relay circuit, for example, and it determines with the detection signal from the said liquid level sensor 93 that the liquid level of the residual water in the roller main body 2 is more than a predetermined upper limit, The start signal is output to the suction pump 92 to start the suction pump 92. In addition, a predetermined upper limit here is the liquid level set in the range in which the residual water does not contact the induction coil 32 of the induction heating mechanism 3. Moreover, when the control part 94 starts the suction pump 92, stops the suction pump 92 after a predetermined time, or when the detection signal obtained by the liquid level sensor 93 becomes below a predetermined lower limit, It is considered to stop the suction pump 92 or the like. In addition, a predetermined | prescribed lower limit here is a grade which remains substantially in the roller main body 2, for example.

<Effect of this embodiment>

According to the induction heating roller device 100 according to the present embodiment configured as described above, by introducing the free cooling medium into the roller body 2, the free cooling medium contacts the inner circumferential wall of the roller body 2 to evaporate. The roller body 2 and the induction heating mechanism 3 can be cooled by the latent heat of evaporation at the time and the latent heat at the time of temperature rise in the roller body 2 and the latent heat at the time of vaporization evaporation. Then, the free cooling medium is introduced from the axial end of the substantially cylindrical gap portion X formed between the roller body 2 and the induction heating mechanism 3, and the gap portion X is formed. By discharging the cooling medium from the axial end to the outside of the roller body 2, the free cooling medium can be spread widely throughout the gap portion X. In addition, since the free cooling medium is used, the cooling medium in contact with the roller body 2 can be reduced, and corrosion of the inner wall of the roller body 2, deposition of impurities, and the like can be suppressed.

In addition, when the liquid level sensor 93 reaches a predetermined upper limit value, the suction pump is started to discharge the liquid cooling medium remaining in the roller body 2, so that the liquid inside the roller body 2 is discharged. The cooling medium may be collected to solve a problem such that the liquid cooling medium is in contact with the induction coil 32 of the induction heating mechanism 3 and the insulation deterioration.

<Other modified embodiments>

The present invention is not limited to the above-described embodiments.

For example, in the above embodiment, the liquid level of the remaining liquid cooling medium is detected using a liquid level sensor to control the start timing of the suction pump. However, as shown in FIG. 3, the liquid level sensor may be configured without using the liquid level sensor. In other words, the liquid cooling medium may be sucked from the suction port 91a of the liquid medium discharge pipe 91 at all times while the free cooling medium is passed through the gap X by the cooling mechanism 8. In this way, the configuration of the liquid level sensor can be omitted. In addition, since the liquid cooling medium is discharged at all times, the induction coil can be prevented from coming into contact with the liquid cooling medium.

Moreover, in the said embodiment, the suction port 91a of the liquid medium discharge pipe 91 is arrange | positioned in the clearance gap X2 of an axial direction end part from the viewpoint of an arrangement space, and the liquid level sensor in the clearance gap X2 of the other end part of an axial direction. Although 93 is arrange | positioned, you may arrange them in the same clearance gap X2.

In the said embodiment, although the case where it applied to the induction heating roller apparatus of both support types was demonstrated, it can also apply to what is called a letter-type induction heating roller apparatus.

In addition, in the above embodiment, the free cooling medium is supplied to the gap, but the pipe is provided inside the induction heating mechanism, and the induction heating mechanism is preferentially cooled by circulating the free cooling medium in the pipe. You may comprise so that it may be possible. As a result, it is possible to prevent deterioration of the performance of the electric wire and the iron core constituting the induction coil.

Furthermore, in the above embodiment, the free cooling medium is introduced from the axial one end of the crevice and discharged from the other end of the crevice, but is introduced from the axial one end of the crevice and from the same axial one end. You may discharge it.

In addition, this invention is not limited to the said embodiment, Needless to say that various deformation | transformation is possible in the range which does not deviate from the meaning.

100 ... Induction heating roller device 2. Roller body
3…. Induction heating mechanism X. Crevice
8 … Cooling mechanism 9... Liquid medium discharge mechanism
91 ... Liquid medium discharge pipe 91a... Suction port
92. Suction pump 93... Liquid level sensor

Claims (4)

A roller body rotatably supported,
An induction heating mechanism disposed in the roller body and configured to induce heat generation of the roller body;
A cooling mechanism for distributing a free-form cooling medium in a substantially cylindrical gap formed between the roller body and the induction heating mechanism;
And a liquid medium discharge mechanism for discharging the liquid cooling medium remaining in the roller body to the outside of the roller body. The method according to claim 1,
The liquid medium discharge mechanism is provided with a suction port in the lower portion of the gap portion and the liquid medium discharge pipe extending to the outside of the roller body, and provided on the liquid medium discharge pipe outside the roller body to suck the liquid cooling medium from the suction port Induction heating roller device having a suction pump. The method according to claim 2,
And the suction pump draws a liquid cooling medium from the suction port while the suction pump distributes a free cooling medium to the gap by the cooling mechanism. The method according to claim 2,
The liquid medium discharge mechanism is provided with a liquid level sensor for detecting the liquid level of the liquid cooling medium remaining in the gap portion,
And the suction pump sucks the liquid cooling medium from the suction port when the liquid level of the liquid cooling medium becomes a predetermined value or more due to the detection signal obtained by the liquid level sensor.

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