Inflatable sealing ring structure

Abstract

The utility model relates to the technical field of vacuum furnace sealing, in particular to an inflatable sealing ring structure which comprises a locking ring, a sealing ring and a protection assembly. The locking ring and the furnace door flange are respectively provided with an inclined iron A and an inclined iron B which are matched with each other; after the locking ring rotates, the inclined iron A and the inclined iron B are clamped through an inclined surface, so that the furnace door flange is close to the furnace body flange; an annular sealing groove is formed in a furnace body flange, a sealing ring with a V-shaped cross section is arranged in the annular sealing groove, a hole channel is formed in the sealing groove and connected with an external protection assembly through a gas pipe, and the protection assembly is used for nitrogen protection on a workpiece when the sealing ring leaks gas. The sealing ring is of a V-shaped structure, after the furnace door is closed and locked, the sealing ring is filled with high-purity nitrogen, the whole sealing face and the furnace door are evenly compressed through air pressure, and reliable sealing is guaranteed. And if the vacuum furnace is in operation, the sealing ring is suddenly aged and cracked, nitrogen in the sealing ring can enter the vacuum furnace, and product oxidation cannot be caused.

Description

Technical Field

[0001] The utility model relates to the technical field of vacuum furnace sealing, in particular to an air expansion type sealing ring structure. Background Art

[0002] At present, vacuum furnace doors and furnace body flanges use O-rings, lip-shaped sealing rings, etc. The sealing rings are pressed tightly against the furnace door to ensure sealing performance. Over time, the rubber rings will cause cracks. After cracking, air may enter the vacuum furnace seal and oxidize the products in the furnace. Utility Model Content

[0003] In order to solve the above technical problems, the utility model provides an inflatable sealing ring structure.

[0004] The specific technical solutions are as follows:

[0005] An inflatable sealing ring structure is used for sealing between a furnace door flange and a furnace body flange of a vacuum furnace. The sealing ring structure comprises a locking ring, a sealing ring and a protection component. The locking ring is annular and wrapped around the furnace door flange and the furnace body flange. The locking ring and the furnace door flange are respectively provided with mutually matching oblique irons A and oblique irons B. After the locking ring is rotated, the oblique irons A and B are engaged through inclined surfaces to make the furnace door flange and the furnace body flange close to each other. An annular sealing groove is provided inwardly on the end surface of one side where the furnace body flange abuts against the furnace door flange, and a sealing ring is built in. The cross section of the sealing ring is V-shaped, and the V-shaped opening faces the inside of the sealing groove. A channel is provided in the sealing groove, which is connected to an external protection component through an air pipe. The protection component is used for nitrogen protection of the workpiece when the sealing ring leaks.

[0006] The protection component includes a pressure sensor, an electromagnetic reversing valve, a pressure reducing valve and a nitrogen source connected in sequence. The pressure reducing valve is used to adjust the gas pressure, and the pressure sensor is used to display the pressure in the sealing ring and control the switch of the electromagnetic reversing valve to realize the inflation and deflation of the sealing ring.

[0007] The oblique iron A and the oblique iron B are respectively arranged on the end faces of the locking ring and the furnace door flange that are opposite to each other, and are arranged at intervals on the circumference. After the locking ring rotates, the oblique iron A and the oblique iron B are clamped together.

[0008] The rotation of the locking ring is achieved by a cylinder installed on the furnace body.

[0009] Compared with the prior art, the utility model has the following beneficial technical effects:

[0010] The sealing ring of the utility model adopts a V-shaped structure. After the furnace door is closed and locked, high-purity nitrogen is filled into the sealing ring. The pressure can be adjusted. The general pressure is 0.5MPa. The entire sealing surface and the furnace door are evenly pressed by air pressure to ensure reliable sealing. At the same time, if the vacuum furnace is in operation and the sealing ring suddenly ages and cracks, the nitrogen in the sealing ring will enter the vacuum furnace, and will not cause product oxidation. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a cross-sectional schematic diagram of the sealing ring structure of the utility model;

[0012] Figure 2 for Figure 1 A local enlarged schematic diagram of the middle A;

[0013] Figure 3 Schematic diagram of the positions of the inclined iron A and the inclined iron B before the furnace door is closed and locked;

[0014] Figure 4 Schematic diagram of the positions of inclined iron A and inclined iron B after the furnace door is closed and locked;

[0015] In the figure, 1. furnace door flange; 2. locking ring; 3. oblique iron A; 4. oblique iron B; 5. furnace body flange; 6. sealing groove; 7. sealing ring; 8. channel; 9. pressure sensor; 10. air pipe; 11. solenoid reversing valve; 12. pressure reducing valve; 13. nitrogen source; 14. cylinder. DETAILED DESCRIPTION

[0016] The present invention will be described in detail below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited by the accompanying drawings.

[0017] Figure 1 It is a cross-sectional schematic diagram of the sealing ring structure of the utility model. Figure 2 for Figure 1A partial enlarged schematic diagram of the center A is shown in the figure: the inflatable sealing ring structure of the utility model is used for sealing between the furnace door flange 1 and the furnace body flange 5 of the vacuum furnace. The sealing ring structure includes a locking ring 2, a sealing ring 7 and a protective component; the locking ring 2 is annular and wrapped around the furnace door flange 1 and the furnace body flange 5. The locking ring 2 and the furnace door flange 1 are respectively equipped with mutually matching oblique irons A3 and oblique irons B4. After the locking ring 2 is rotated by the cylinder 14 installed on the furnace body, the oblique irons A3 and oblique irons B4 are engaged through the inclined surfaces to make the furnace door flange 2 close to the furnace body flange 5; the furnace body flange 5 abuts against the furnace door flange 1 An annular sealing groove 6 is provided inwardly on one end surface of the sealing ring 7, and a sealing ring 7 is built in; the cross section of the sealing ring 7 is V-shaped, and the opening of the V-shape is facing the inside of the sealing groove 6; a channel 8 is provided in the sealing groove 6, which is connected to an external protection component through an air pipe 10, and the protection component is used for nitrogen protection of the workpiece when the sealing ring 2 leaks. The protection component includes a pressure sensor 9, an electromagnetic reversing valve 11, a pressure reducing valve 12 and a nitrogen source 13 connected in sequence, the pressure reducing valve 12 is used to adjust the gas pressure, and the pressure sensor 9 is used to display the pressure in the sealing ring 7, and at the same time control the switch of the electromagnetic reversing valve 11 to realize the inflation and deflation of the sealing ring 7.

[0018] Figure 3 Schematic diagram of the positions of inclined iron A and inclined iron B before the furnace door is closed and locked. Figure 4 Schematic diagram of the positions of the bevel iron A and the bevel iron B after the furnace door is closed and locked. As shown in the figure, the bevel iron A3 and the bevel iron B4 are respectively arranged on the opposite end faces of the locking ring 2 and the furnace door flange 1, and are arranged at intervals on the circumference. After the locking ring 2 is rotated, the bevel iron A3 and the bevel iron B4 are engaged together.

[0019] Used as follows:

[0020] After the furnace door is closed, the locking ring 2 is driven to rotate by the cylinder 14. After the locking ring 2 rotates, the inclined iron A3 and the inclined iron B4 are engaged through the inclined surface to make the furnace door flange 1 and the furnace body flange 5 close to each other. The nitrogen source 13 passes through the pressure reducing valve 12 and the electromagnetic reversing valve 11. After the nitrogen pressure reaches the set pressure of the pressure sensor 9, the electromagnetic reversing valve 11 is closed, that is, nitrogen is filled into the sealing ring 7, and the sealing ring 7 is in close contact with the sealing groove 6 of the furnace door flange 1 and the furnace body flange 5, which plays a sealing role. If the sealing ring 7 is aged, the gas entering the vacuum chamber is nitrogen, which plays a protective role on the workpiece.

[0021] Before opening the furnace door, the pressure in the sealing ring 7 is released to atmospheric pressure through the electromagnetic reversing valve 11 (detected by the pressure sensor 9), and the locking ring 2 is rotated to open the furnace door through the furnace door handle.

Claims

1. An inflatable sealing ring structure, used for sealing between a door flange (1) and a furnace body flange (5) of a vacuum furnace, characterized in that: The sealing ring (7) structure comprises a locking ring (2), a sealing ring (7) and a protection component; the locking ring (2) is annular and wrapped around the furnace door flange (1) and the furnace body flange (5); the locking ring (2) and the furnace door flange (1) are respectively provided with a bevel iron A (3) and a bevel iron B (4) that match each other; after the locking ring (2) is rotated, the bevel iron A (3) and the bevel iron B (4) are engaged through the bevel surface so that the furnace door flange (1) and the furnace body flange (5) are close to each other; an annular sealing groove (6) is provided inwardly on the end surface of one side where the furnace body flange (5) abuts against the furnace door flange (1), and the sealing ring (7) is built in; the cross section of the sealing ring (7) is V-shaped, and the opening of the V-shape faces the inner side of the sealing groove (6); a channel (8) is provided in the sealing groove (6), which is connected to an external protection component through an air pipe (10); the protection component is used for nitrogen protection of the workpiece when the sealing ring (7) leaks.

2. The inflatable sealing ring structure according to claim 1, characterized in that: The protection component comprises a pressure sensor (9), an electromagnetic reversing valve (11), a pressure reducing valve (12) and a nitrogen source (13) which are connected in sequence. The pressure reducing valve (12) is used to adjust the gas pressure. The pressure sensor (9) is used to display the pressure in the sealing ring (7) and simultaneously controls the switch of the electromagnetic reversing valve (11) to realize the inflation and deflation of the sealing ring (7).

3. The inflatable sealing ring structure according to claim 1, characterized in that: The inclined iron A (3) and the inclined iron B (4) are respectively arranged on the opposite end faces of the locking ring (2) and the furnace door flange (1), and are arranged at intervals on the circumference. After the locking ring (2) rotates, the inclined iron A (3) and the inclined iron B (4) are locked together.

4. The inflatable sealing ring structure according to claim 1, characterized in that: The rotation of the locking ring (2) is achieved by a cylinder (14) installed on the furnace body.

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