JPH0471A - Differential pressure seal device - Google Patents

Abstract

PURPOSE:To minimize gas passing through a minute gap formed between a guide roll and a sealing attachment so as to facilitate manufacture by sealing the gap with a seal member except the passage of a long-sized belt. CONSTITUTION:A long-sized thin belt 1 is carried through a minute gap 10 between a guide roll 8 and a sealing attachment 9 of a difference pressure seal device 7 provided at the boundary between space regions 2, 4 having pres sure difference. In this case the minute gaps 10a, 10b are sealed with seal members 12a, 12b, 12c except a passage 11 of the belt 1. The gas circulation sectional area of the gap 10 is thus decreased to reduce the gas passing through the device 7 and thereby to dispense with an extreme improvement in the work ing accuracy and mounting accuracy of seal faces 13a, 13b of the sealing attach ment 9, resulting in easiness in production and assembly.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention provides a method for transporting a long ribbon such as a steel plate across a spatial region with a pressure difference such as an atmospheric pressure region and a vacuum pressure region. The present invention relates to a differential pressure seal device provided for maintaining the pressure difference.

(Prior Art) Conventionally, a differential pressure sealing device for maintaining a pressure difference as described above has a single guide roll that winds and guides a long ribbon around the boundary of a spatial region where there is a pressure difference, and a single guide roll that guides the long thin ribbon. The long ribbon is continuously passed through a minute gap formed between the guide roll and the sealing attachment, restricting the passage of gas and reducing the pressure difference between the spatial regions. I try to maintain
(Patent Application No. 121016/1982).

(Problem to be Solved by the Invention) The conventional differential pressure sealing device described above has the advantage of being able to maintain a high differential pressure simply by winding a long ribbon around a guide roll, but the passage path of the long ribbon The amount of gas that passes through the small gap between the guide roll outside the component and the sealing attachment is so large that it cannot be ignored, and it is necessary to install a vacuum pump with a large displacement to maintain the differential pressure. However, the sealing surface of the sealing attachment must be machined with high precision, the sealing attachment must be mounted with high precision, and the gap between the sealing surface and the long ribbon must be made small. There were problems such as poor manufacturability. This gap needs to be about 0.2 to 0.7 mm, considering that the temperature of the long ribbon may be raised to about 100 to 400°C.

An object of the present invention is to provide a differential pressure sealing device that allows a small amount of gas to pass through a minute gap between a guide roll and a sealing attachment and is easy to manufacture.

(Means for Solving the Problems) The present invention includes a single guide roll that winds and guides a long thin ribbon around the boundary of a spatial region where there is a pressure difference, and a single guide roll that extends around the outer periphery of the guide roll approximately halfway around. A differential pressure sealing device constituted by a surrounding sealing attachment is provided to guide the continuous passage of the elongated ribbon while maintaining the pressure difference, and a sealing device is provided between the guide roll and the sealing attachment. The above object is achieved by closing the formed minute gap with a sealing material, leaving a passage for the long ribbon.

(Function) A differential pressure sealing device is provided, for example, at the boundary between an atmospheric pressure space region and a vacuum pressure space region, and a long ribbon is wound around a guide roll to separate the atmospheric pressure space region from the vacuum pressure space region. pass to. Approximately half of the outer periphery of the guide roll is surrounded by a sealing attachment with a small gap between the guide roll and the guide roll.
The periphery of the long ribbon passing through the gap is sealed, and the differential pressure in the rain space area is maintained.

The gap is formed, for example, along both sides of the long thin strip, and also on the surface opposite to the winding surface of the long thin strip in the axial direction of the guide roll, excluding the passing path of the long thin strip. Seal with sealing material provided along the As a result, the gas flow cross-sectional area of the gap is reduced, the amount of gas passing through the differential pressure sealing device is reduced, and it is not necessary to extremely increase the machining accuracy and installation accuracy of the sealing surface of the sealing attachment, which improves manufacturing efficiency. will improve.

(Embodiment) An embodiment of the present invention will be described based on the drawings. In FIG. 1, reference numeral (1) indicates a vacuum chamber (3) constituting a vacuum pressure space region (2) and an atmospheric pressure space region. (4) shows a long ribbon such as a steel plate that is conveyed across the rain space area (2).
) (3), a plurality of differential pressure chambers (5) each having a vacuum exhaust port (6) connected to a vacuum pump are arranged in series, and the partition walls (5a) (5b) of each differential pressure chamber (5) ) (5c) (
5d) are each provided with a differential pressure sealing device (7) for sealing the periphery of the long ribbon (1) being conveyed, and the space area (2) is
(4) Maintain the differential pressure between. In the vacuum chamber (3), a long ribbon (1) of, for example, a steel plate is subjected to surface treatment by dry grating.

The differential pressure sealing device (7) consists of a single guide roll (8)
And, there is a minute gap (10a) <10 at two locations on the upper surface and lower surface of the outer periphery of the guide roll (8) over approximately half the circumference thereof.
b) a sealing attachment (9) having sealing surfaces (13a) and (13b) surrounding the sealing surface;
The long ribbon (1) is wound and guided around the guide roll (8).

The above configuration is approximately the same as that of a conventional differential pressure sealing device, but in the present invention, as shown in FIGS. 2 to 4, a long ribbon ( 1) Passing route part (
11) and close it with a sealing material (12), leaving the small gap (
The amount of gas flowing through the differential pressure sealing device (7) is reduced by reducing the cross-sectional area of the sealing attachment (9).
Sealing material (12a) (
12b), and the long ribbon (1) of the guide roll (8) is provided.
) is wound around the guide roll (8) other than the passing route portion (11) by providing an axial sealing material (12e) of the guide roll (8) in contact with the location opposite to the location where the guide roll (8) is wound. and the sealing attachment (9), reducing the cross-sectional area of the micro-gap (LOA) between the lower micro-gap (LOA)
10b) was closed.

The sealing material (12a) (12b) has a notch (14) formed on the side of the sealing attachment (9).
It is fixed with a holding plate (15), and the sealing material (12c
) was fixed to the back of the sealing attachment (9) with a holding plate (IB).

To explain its operation, a spatial region with a pressure difference (2)
(4) The long ribbon (1) is conveyed through the minute gap (10) between the guide roll (8) of the differential pressure sealing device (7) and the sealing attachment (9) provided at the boundary between the two. However, the minute gap (10) is filled with sealing material (12a) (12b) (
12c), the gas flow cross-sectional area of the gap (10) is reduced, the amount of gas passing through the differential pressure sealing device (7) is reduced, and the sealing attachment (
9) It is not necessary to extremely increase the machining accuracy and mounting accuracy of the sealing surfaces (13a) and (13b), making manufacturing and assembly easier.

In the conventional case, consideration was given to machining accuracy and installation accuracy so that the gap size of the minute gap (10b) was narrower than the gap size of the minute gap (10a), but in the case of the present invention, such consideration was taken. is no longer necessary, and the amount of gas passing through can be made about 60% stronger than in the conventional case.

(Effects of the Invention) As described above, in the present invention, the minute gap formed between the guide roll and the sealing attachment of the differential pressure sealing device is filled with the sealing material while leaving a passage for the long ribbon. This reduces the amount of gas that passes through the minute gap, and it can be done efficiently using a small vacuum pump to ensure the pressure difference.The equipment is inexpensive, reduces operating costs, and reduces the need for sealing attachments. Since there is no need to increase the processing accuracy of the sealing surface or the accuracy of its attachment, manufacturing and assembly are facilitated.

[Brief explanation of the drawing]

Fig. 1 is an overall side view of an embodiment of the present invention, Fig. 2 is an enlarged perspective view of essential parts, and Figs. 3 and 4 are cross-sectional views taken along the ■-■ line and IV-IV line of Fig. 2, respectively. It is. (1)...Long ribbon (2) (4)...Space area (7)...Differential pressure sealing device (8)...Guide roll (9)...Sealing attachment (10) (1
0a) (fob) - Minute gap (11)...Passing path section (12) (12a) (12b) (12e) -...Sealing material patent application Same as above Agent Kawasaki Steel Co., Ltd. Japan Vacuum Technology Co., Ltd. Kitamura Kingai 3 people

Claims (1)

[Claims] A differential pressure sealing device is provided at the boundary of a spatial region where there is a pressure difference, which is composed of a single guide roll that winds and guides a long ribbon, and a sealing attachment that surrounds approximately half the outer circumference of the guide roll. In a device that guides the continuous passage of the long ribbon while maintaining the pressure difference, the minute gap formed between the guide roll and the sealing attachment is A differential pressure sealing device characterized in that a passage passage portion is left and is closed with a sealing material.