JP4488866B2 - Sealing device for jacket chamber for heat roller - Google Patents

Description

  The present invention relates to a sealing device for a jacket chamber for a heat roller.

  For example, a so-called induction heating roller in which an alternating magnetic flux generating mechanism in which an induction coil or an induction coil is wound around an iron core is installed in the hollow of the roller body and Joule heat is generated by the alternating magnetic flux generated by the alternating magnetic flux generating mechanism is well known. . Such an induction heat generating roller has a property that a large amount of heat is generated in the central portion of one induction coil in the longitudinal direction, and the amount of heat generation decreases as it goes to the end portion. Therefore, the surface temperature in the longitudinal direction of the roller is low. It becomes uniform. In order to eliminate this non-uniformity, a jacket chamber is provided along the longitudinal direction on the peripheral wall of the roller body, and an appropriate amount of heat medium such as water is injected into the jacket chamber, and then the jacket chamber is sealed. If it does in this way, a heat carrier will take heat at the location with much calorific value, and it will vaporize, and the vaporized heat medium will move to the place where calorific value is small, will release heat, and will liquefy. By this latent heat movement, the surface temperature in the longitudinal direction of the roller body is made uniform.

  When the jacket chamber enclosing the gas-liquid two-phase heat medium is provided in this way, when the roller body is abnormally heated, the gas-liquid two-phase heat medium enclosed in the jacket chamber becomes high temperature, and the jacket chamber The internal pressure is abnormally increased, and the jacket chamber and thus the roller body may be damaged or explode due to the pressure. In order to prevent this possibility, it is necessary to release the sealing of the jacket chamber when the pressure inside the jacket chamber exceeds a predetermined pressure.

  FIG. 7 shows an example of an induction heating roller device provided with a sealing device for releasing the sealing of the jacket chamber. In FIG. 7, reference numeral 1 denotes a cantilever type roller body, to which a shaft 2 is connected. The bearing 4 is supported by the fixed frame 3 so as to be rotatable. A fixed platen 5 is fixed to the fixed frame 3 with screws 6, and the fixed platen 5 is disposed so as to face the opening surface of the roller body 1 so as to cover it.

  An alternating magnetic flux generating mechanism 8 including an induction coil 7 coaxial with the roller body 1 is supported on the fixed platen 5. The illustrated alternating magnetic flux generation mechanism 8 is an example in which an iron core is not used, but when an iron core is used, it is also supported by the fixed platen 5. When the induction coil 7 is excited by an AC power supply via the lead wire 9, a current is induced in the peripheral wall 1A of the roller body 1, and the peripheral wall 1A generates Joule heat by this current.

  The temperature of the peripheral wall 1 </ b> A is detected by temperature sensors 11 and 12. The voltage induced corresponding to the temperature detected by the temperature sensor 11 is led to the outside via the lead 13, and the voltage induced corresponding to the temperature detected by the temperature sensor 12 is led to the outside via the rotary transformer 14. The The surface temperature of the peripheral wall 1A is maintained at a desired value by adjusting the excitation voltage of the induction coil 7 according to the detected temperature in this way. A plurality of airtight jacket chambers 15 are installed in the thick part of the peripheral wall 1A, and a gas-liquid two-phase heat medium is sealed therein. By moving the latent heat due to the phase change of the heat medium, the entire area of the peripheral wall 1A is soaked to obtain a uniform temperature distribution.

  The jacket chamber 15 is provided with a communication hole that communicates with the outside air that includes a small-diameter sealing hole 16 communicating with the jacket chamber 15 and a large-diameter screw hole 25 contiguous to the sealing hole 16 and concentric with the sealing hole 16. In the illustrated example, the communication hole is provided so as to open at the opening edge of the roller body 1. The opening surface of the screw hole 25 faces the fixed platen 5 through a gap, and the sealing device 19 shown in an enlarged manner in FIG. 8 is provided in the screw hole 25. The sealing device 19 includes a spherical valve 17 made of metal such as steel, and a screw 18 to which the valve 17 is fixed. The valve 17 has a through hole 20 passing through the center thereof. A pin 21 made of, for example, copper is inserted into 20 so as to penetrate the pin. A minute gap 20A between the pin 21 and the inner peripheral surface of the through hole 20 is filled with a soluble metal 22 such as solder that becomes molten at a predetermined temperature. When the soluble metal 22 is in a low temperature state below a predetermined value and in a solid state, the pin 21 is fixed inside the through hole 20.

The screw 18 is formed with a hole 23 having substantially the same diameter as the through hole 20 of the valve 17 and a screw tightening hole 24 continuous therewith, and the end of the pin 21 is inserted into the hole 23. The valve 17 and the screw 18 are fixed with, for example, an adhesive while the pin 21 is inserted. The hole 23 is formed at the center of the screw 18, and the pin 21 is inserted into the hole 23 to fix the valve 17 to the screw 18. After that, the screw 18 is screwed so that the valve 17 can be pressed against the edge 16A of the opening of the sealing hole 16 (hereinafter referred to as a sealing port) as a valve seat. Thereby, the sealing hole 16 is reliably sealed. Further, when the inside of the jacket chamber 15 becomes in an abnormally high temperature state, the soluble metal melts, and the pin 21 is extracted from the valve 17 by the internal pressure of the jacket chamber 15, thereby releasing the sealing of the jacket chamber 15.
Japanese Patent Publication No. 5-86638 JP 2002-208470 A

In the sealing device configured as described above, the through-hole 20 of the spherical valve 17 and the through-hole 23 of the screw 18 are aligned so that the valve 17 is attached to the end face of the screw 18 and screwed into the screw hole 25. The valve 17 is pressed against the end edge 16A of the sealing port and sealed. Therefore, when the through hole 20 of the valve 17 is eccentrically attached to the screw 18, the valve 17 cannot be sealed with a uniform contact pressure with respect to the sealing port edge 16A of the sealing hole 16, Further, the rotational force at the time of tightening with the screw 18 is transmitted to the valve 17 through the line contact surface, the rotational force is also generated in the valve 17 itself, slipping occurs at the sealing port edge 16A of the sealing hole 16, and the sealing port end. There was a problem that the edge 16A was damaged, and as a result, the heat medium in the jacket chamber 15 leaked.

  A problem to be solved by the present invention is a spherical valve having a through hole filled with a soluble metal that is in a molten state when the inside of the jacket chamber is in an abnormally high temperature state, and a screw for screwing and fixing the valve. In the sealing device in which the sealing port of the jacket chamber is sealed with a valve, the valve can be easily installed with uniform contact pressure at the end of the sealing port of the jacket chamber, and this problem is solved. Is a point.

  The present invention includes a spherical valve having a through-hole filled with a soluble metal that is in a molten state at a predetermined temperature, and a screw that fastens and fixes the spherical valve, and is formed in the peripheral wall of the heat roller body. One of the through holes of the spherical valve is applied to an opening communicating with the outside of the jacket chamber formed by injecting a two-phase heat medium, and the jacket chamber is screwed and fixed to the heat roller body with the screw. A sealing device for a heat roller jacket chamber, wherein the spherical valve and the screw are brought into contact with each other at a point separated from the other hole of the through hole of the spherical valve. To do.

  In the invention, the spherical valve is placed in contact with the edge of the sealing port in a state where the hole of the through hole of the spherical valve faces the sealing port of the jacket chamber, and the valve is fixed by tightening with a screw. At that time, there is no line contact between the hole of the through hole of the valve and the screw, and the screw and the spherical surface of the valve are in contact at one point. Therefore, the rotational force of the screw is not transmitted to the valve, and Damage due to rotation can be prevented, and the spherical valve applied to the sealing port maintains the installed state and is not eccentric, which ensures that the jacket chamber is kept sealed at normal temperature. In addition, when the jacket chamber reaches an abnormally high temperature, the soluble metal filled in the through hole of the valve is melted, and the pressure in the jacket chamber is released to the outside through the through hole of the valve, so that the sealing can be reliably released.

  For the purpose of enabling easy and reliable installation of the valve with uniform contact pressure at the edge of the sealing port of the jacket chamber, the hole of the through hole of the spherical valve is removed from the contact surface of the screw, and the spherical valve This was realized by contacting the spherical surface of the screw and the end face of the screw.

  1A and 1B are diagrams showing a configuration of a sealing device for a jacket chamber for a heat roller according to an embodiment of the present invention, wherein FIG. 1A is a sectional view of the sealing device, and FIG. 1B is a plan view of a screw. In addition, the same code | symbol is attached | subjected to the part which is the same as that of the conventional sealing device shown in FIG. 8, and respond | corresponds. In FIG. 1, reference numeral 1 denotes a heat roller main body having a heating source such as an induction coil in a hollow similar to the induction heat roller apparatus shown in FIG. 7, and 15 denotes a heat roller main body 1 in the thick portion of the peripheral wall of the heat roller main body 1. A jacket chamber formed by a drill or the like along the longitudinal direction, 16 is a small-diameter sealing hole communicating with the jacket chamber 15, and 25 is a large-diameter screw hole contiguous to the sealing hole 16 and concentric with the sealing hole 16. The chamber 15 communicates with the outside air via the sealing hole 16 and the screw hole 25.

  Reference numeral 30 denotes a spherical valve made of metal such as steel, and the spherical valve 30 has a hole 30A extending in a radius and a hole 30B communicating with the hole 30A and extending in a diameter, that is, a through hole opening at three positions of a spherical surface branched in a substantially T shape. A hole is formed, and a soluble metal 22 that melts at a predetermined temperature such as solder is hermetically filled in the through hole. Reference numeral 31 denotes a screw, and the end surface of the screw 31 that comes into contact with the spherical valve 30 is flat (may be a curved surface), and the peripheral wall thereof communicates with the space 25 in which the spherical valve 30 is disposed and the outside. A concave groove 31 </ b> A that forms a passage is formed, and a screw tightening hole 31 </ b> B is formed on the opposite end surface that contacts the valve 30.

  Note that this communication passage is a passage that discharges abnormal pressure in the jacket chamber 15, and in this example, the groove 31 A is formed on the outer peripheral surface of the screw 31. Alternatively, as shown in FIG. 2, a part of the peripheral wall of the screw 31 may be cut off in a planar shape to form a communication path. Further, as shown in FIG. 3, a through hole 31C extending from the outer peripheral end of the end face of the screw 31 to the screw tightening hole 31B may be formed, and this through hole 31C may be used as a communication path. Further, as shown in FIG. Alternatively, a communication hole 31D for communicating the space 25 in which the spherical valve 30 is disposed in the heat roller body 1 and the outside may be formed, and the communication hole 31C may be used as a communication path. That is, it is sufficient if the hole 31 and the like that form the communication path do not come into contact with each other when the screw 31 and the spherical valve 30 are in contact with each other.

  Then, after injecting an appropriate amount of water or the like, which is a gas-liquid two-phase heat medium, into the jacket chamber 15, the hole of the hole 30 </ b> A extending to the radius of the spherical valve 30 is opposed to the sealing hole of the sealing hole 16. The valve 31 is screwed and fixed by pressing the screw 31 into the screw hole 25 and pressing the end face of the screw 31 against the spherical surface of the valve 31. At the time of fixing, there is no line contact between the end edge of the through hole of the valve 30 and the end face of the screw 31, and the end face of the screw 31 and the spherical surface of the valve 30 are in contact at one point. Without being transmitted to the valve, the valve 30 can always be sealed with a uniform contact pressure with respect to the sealing port edge 16A.

  When the temperature in the jacket chamber 15 is a normal temperature (below the melting temperature of the soluble metal 22) due to this sealing, the soluble metal 22 is not melted and the jacket chamber 15 is maintained in a sealed state and sealed in the jacket chamber 15. The gas-liquid two-phase heat medium achieves the temperature equalization function by the transfer of latent heat. When the temperature in the jacket chamber 15 rises abnormally, the soluble metal 22 filled in the through hole of the valve 30 is melted to open the through hole, and the pressure in the jacket chamber 15 is increased to the hole 30A extending to the radius of the valve 30. It is discharged to the outside through the hole 30B extending in diameter and the concave groove 31A of the screw 31 in this embodiment.

  In the above embodiment, the through hole of the valve 30 is formed by the hole 30A extending in the radius and the hole 30B communicating with the hole 30A and extending in the diameter, but the configuration of the through hole of the valve 30 is the through hole of the valve. It is sufficient if the hole opening edge and the end face of the screw are not in contact with each other. For example, a Y-shaped or diagonally straight through-hole may be used.

  By the way, the soluble metal filled in the through hole of the valve may be eroded by the heat medium vapor in the jacket chamber, and the through hole of the valve may be opened early. In order to prevent early opening due to this erosion, an obstructing member having an appropriate shape such as a rod shape or a spherical shape made of copper may be inserted into the through hole of the valve. FIG. 5 shows an example in which a rod-shaped obstacle member (hereinafter referred to as a pin) is inserted into the valve through-hole (FIG. 4 is also an example in which a pin is inserted), and FIG. 6 shows a spherical shape in the valve through-hole. This is an example in which an obstacle member (hereinafter referred to as a ball) is inserted. 5 and 6, the same reference numerals are given to the same portions as those of the sealing device of the embodiment shown in FIG.

  In the example shown in FIG. 5, a pin 32 extending across the diameter is inserted into the hole 30 </ b> B extending to the diameter in the spherical valve 30 having a through hole including a hole 30 </ b> A extending in the radius and a hole 30 </ b> B communicating with the hole 30 </ b> A and extending in the diameter. Then, a soluble metal 22 such as solder is hermetically filled in a narrow space between the inner wall of the hole 30A extending in the radius and the inner wall of the hole 30B extending in the diameter and the outer wall of the pin 32. In this case, even when the soluble metal 22 in the hole 30A extending in the radius is eroded, the soluble metal 22 in the narrow space between the inner wall of the hole 30B extending in the diameter and the outer wall of the pin 32 is hardly eroded, and the through hole of the valve Opening early can be prevented. Note that the pin 32 is usually fixed by the soluble metal 22, and when the temperature in the jacket chamber rises abnormally, the soluble metal 22 filled in the through hole of the valve 30 melts, and the pressure in the jacket chamber extends to the radius of the valve 30. It is discharged to the outside through the hole 30A, the space between the inner wall of the hole 30B extending in diameter and the outer wall of the pin 32, and the groove 31A of the screw 31.

  In the example shown in FIG. 6, a spherical valve 30 having a through hole composed of a hole 30 </ b> A extending in a radius and a hole 30 </ b> B communicating with the hole 30 </ b> A and extending in a diameter, and an end of the hole 30 </ b> A extending in a radius facing the sealing port of the jacket chamber. The ball 33 is inserted into the ball and the ball is fixed with the soluble metal 22. In this case, the space between the inner wall of the hole 30A extending in the radius and the ball 33 is narrow, and the soluble metal 22 is hardly eroded. The shape of the ball 33 may be polygonal, but when the temperature in the jacket chamber rises abnormally, the soluble metal 22 filled in the through hole of the valve 30 melts, and the ball pressure is released by releasing the vapor pressure in the jacket chamber. 33 is pushed in. Even at that time, in order to ensure a cross section through which the steam passes, a space 30C in which the ball 33 is located is formed at the end of the hole 30A extending in the radius.

  The present invention is not applied only to the cantilever induction heating roller shown in FIG. 7, but also to a so-called both-supporting induction heating roller that supports the roller body at both ends thereof. Needless to say, the present invention can also be applied to a heating or heat removal roller using a heating source as a heater or a heat transfer fluid.

It is sectional drawing which shows the structure of the sealing device which concerns on the Example of this invention. It is a top view which shows the other example of a screw. They are the top view (a) and sectional drawing (b) which show the other example of a screw | thread. It is sectional drawing which shows the other example of a communicating path. It is sectional drawing which shows the other structure of a valve. It is sectional drawing which shows other structure of a valve. It is sectional drawing of an induction heating roller apparatus. It is sectional drawing which shows the structure of the conventional sealing device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Heat roller body 15 Jacket chamber 16 Enclosure hole 16A Enclosure opening edge 22 Soluble metal 25 Screw hole 30 Globe valve 30A Radial hole 30B Diameter hole 31 Screw 31A, 31C, 31D Communication path 32 Pin 33 Ball

Claims (5)

  Gas-liquid two-phase heat formed in the peripheral wall of the heat roller body, having a spherical valve having a through-hole filled with a soluble metal that is in a molten state at a predetermined temperature, and a screw for screwing and fixing the spherical valve One opening of the through hole of the spherical valve is applied to the opening communicating with the outside of the jacket chamber formed by injecting the medium, and the jacket chamber is sealed by screwing and fixing the heat roller body with the screw. A thermal roller jacket chamber comprising: the spherical valve and the screw, which are in contact with each other at a point separated from the other hole of the through hole of the spherical valve. Chamber sealing device.   2. The sealing device for a jacket chamber for a heat roller according to claim 1, further comprising a communication passage that communicates the space in which the spherical valve is disposed with the outside.   2. The sealing device for a jacket chamber for a heat roller according to claim 1, wherein a plurality of other holes of the through hole of the spherical valve are formed.   2. An appropriately shaped metal obstruction member is inserted into the through hole of the spherical valve, and the obstruction member is fixed with a soluble metal filled in the through hole of the spherical valve. 3. A sealing device for a jacket chamber for a heat roller according to 3.   The jacket for a heat roller according to claim 4, wherein a hollow is formed in the through hole of the spherical valve for retracting a metal obstruction member inserted into the through hole when the soluble metal is melted. Chamber sealing device.

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