Vacuum sealing device for vacuum high-pressure gas quenching furnace

Abstract

The utility model discloses a vacuum sealing device for a vacuum high-pressure gas quenching furnace. The vacuum sealing device comprises a sealing flange seat, a flange cover, a furnace shell flange, a dynamic sealing assembly and a static sealing assembly, the furnace shell flange is arranged on the vacuum high-pressure gas quenching furnace body, and the flange cover is arranged on the furnace shell flange; a flange base extending section is formed at the bottom of the sealing flange base and penetrates through the flange cover, the sealing flange base is located above the flange cover, and the flange cover is in static sealing connection with the flange base extending section and the furnace shell flange through a static sealing assembly. The cylinder piston rod assembly is arranged on the sealing flange seat, penetrates through the sealing flange seat, the flange seat extension section, the flange cover and the furnace shell flange and then is inserted into the vacuum high-pressure gas quenching furnace body; the hot zone cabin cover is connected with the cylinder piston rod assembly; the air cylinder piston rod assembly is in dynamic sealing connection with the flange base extension section through the dynamic sealing assembly. The utility model relates to the technical field of vacuum furnaces, and can solve the problem of poor dynamic sealing effect of an O-shaped sealing ring between a cylinder piston rod and a furnace body in the prior art.

Description

Technical Field

[0001] The utility model relates to the technical field of vacuum furnaces, in particular to a vacuum sealing device for a vacuum high-pressure gas quenching furnace. Background Art

[0002] For the horizontal vacuum high-pressure gas quenching furnace, the hot zone hatch is in a closed state during the heating stage. When the heating process section ends and enters the rapid cooling stage, the hot zone hatch needs to be opened. The opening and closing of the hot zone hatch is achieved by the reciprocating motion of the cylinder piston rod installed on the furnace shell.

[0003] Since the vacuum high-pressure gas quenching furnace requires that when the furnace is in a high-pressure or high-vacuum state, each sealing device must be reliably sealed and must not leak, the cylinder piston rod and the furnace body are sealed by an O-ring in the prior art. The cylinder piston rod reciprocates in a straight line, and there is a dynamic seal between the cylinder piston rod and the furnace body, but the traditional O-ring is only suitable for static sealing. For frequent dynamic sealing, the sealing effect of the O-ring will be greatly reduced or even fail after long-term use, affecting the sealing effect of the vacuum high-pressure gas quenching furnace. Therefore, it is necessary to provide a vacuum sealing device for a vacuum high-pressure gas quenching furnace, which can solve the problem of poor dynamic sealing effect of the O-ring between the cylinder piston rod and the furnace body in the prior art. Summary of the invention

[0004] The utility model aims to provide a vacuum sealing device for a vacuum high-pressure gas quenching furnace, which can solve the problem of poor dynamic sealing effect of an O-type sealing ring between a cylinder piston rod and a furnace body in the prior art.

[0005] The utility model is achieved in this way:

[0006] A vacuum sealing device for a vacuum high-pressure gas quenching furnace comprises a sealing flange seat, a flange cover, a furnace shell flange, a dynamic sealing assembly and a static sealing assembly; the furnace shell flange is welded and installed at the opening and closing opening of the hot zone hatch cover of the vacuum high-pressure gas quenching furnace body, and the flange cover is fixedly installed on the furnace shell flange; a flange seat extension section is formed at the bottom of the sealing flange seat, and a through hole for the flange seat extension section to penetrate and install is formed on the flange cover, the sealing flange seat is located above the flange cover, and the flange cover is statically sealed and connected to the flange seat extension section and the furnace shell flange through the static sealing assembly; the cylinder piston rod assembly is installed on the sealing flange seat and penetrates the sealing flange seat, the flange seat extension section, the flange cover, and the furnace shell flange in sequence, and is then inserted into the vacuum high-pressure gas quenching furnace body, the hot zone hatch cover is located in the vacuum high-pressure gas quenching furnace body and is connected to the cylinder piston rod assembly; the dynamic sealing assembly is arranged in the flange seat extension section, so that the cylinder piston rod assembly is dynamically sealed and connected to the flange seat extension section through the dynamic sealing assembly.

[0007] The dynamic seal assembly includes a piston rod seal and a lip seal, both of which are sealed between the cylinder piston rod assembly and the inner wall of the flange seat extension section, and piston rod seals are provided above and below the lip seal.

[0008] The lip-shaped sealing rings are provided with two lip-shaped sealing rings at intervals, and the two lip-shaped sealing rings are both located between the two piston rod sealing rings, and the two lip-shaped sealing rings are installed in opposite directions.

[0009] A retaining ring is arranged on the top of the flange seat extension section, and the retaining ring is located above an upper piston rod sealing ring.

[0010] The static sealing assembly includes a first O-ring and a second O-ring. The inner wall of the through hole of the flange cover is statically sealed to the outer wall of the flange seat extension section through the first O-ring, and the bottom surface of the flange cover is statically sealed to the top surface of the furnace shell flange through the second O-ring.

[0011] The sealing flange seat, flange cover and furnace shell flange are all formed with a plurality of screw holes. The flange cover is fixedly connected to the furnace shell flange via a first connecting bolt and a first nut. The sealing flange seat, flange cover and furnace shell flange are fixedly connected via a second connecting bolt and a second nut.

[0012] The cylinder piston rod assembly comprises a cylinder body, a cylinder piston rod, a pin shaft and a joint; the cylinder body is mounted on a sealing flange seat, one end of the cylinder piston rod is arranged in the cylinder body, and the other end of the piston rod sequentially penetrates the sealing flange seat, the flange seat extension section, the flange cover, and the furnace shell flange and is then inserted into the vacuum high-pressure gas quenching furnace body; the cylinder piston rod is dynamically sealedly connected to the flange seat extension section through a dynamic sealing assembly, and the hot zone hatch cover is connected to the other end of the piston rod through a joint via a pin shaft.

[0013] A cylinder front end cover flange is arranged at the bottom of the cylinder body, and the cylinder front end cover flange is fixedly mounted on the sealing flange seat by bolts.

[0014] The cylinder body, the sealing flange seat, the dynamic sealing component, the static sealing component, the flange cover, the furnace shell flange, the cylinder front end cover flange and the cylinder piston rod are coaxially arranged.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] 1. The utility model is provided with a dynamic sealing assembly and a static sealing assembly, and the dynamic sealing of the cylinder piston rod in the flange seat extension section is ensured by two piston rod sealing rings and a lip sealing ring, thereby ensuring reliable vacuum sealing when the cylinder piston rod performs linear reciprocating motion for a long time. At the same time, the static sealing connection between the flange cover and the flange seat extension section and the furnace shell flange is ensured by the first O-ring and the second O-ring, and the high pressure and high vacuum sealing requirements in the vacuum high pressure gas quenching furnace are met by combining dynamic sealing and static sealing.

[0017] 2. Since the utility model is provided with a dynamic sealing assembly, the two lip seals are installed in opposite directions, which can realize bidirectional sealing of positive pressure and negative pressure when the cylinder piston rod moves linearly and reciprocatingly; at the same time, the piston rod seal is limited by the retaining ring, which is beneficial to improving the dynamic sealing effect of the dynamic sealing assembly.

[0018] 3. The utility model is provided with a sealing flange seat, a flange cover and a furnace shell flange. The furnace shell flange is fixed on the furnace body of the vacuum high-pressure gas quenching furnace. The sealing flange seat is used to install the cylinder body. The sealing flange seat and its flange seat extension section, the flange cover and the furnace shell flange provide a sealed space for the installation and movement of the cylinder piston rod. Even if the dynamic sealing component fails, the high pressure and high vacuum sealing state in the vacuum high-pressure gas quenching furnace can be guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The utility model is a cross-sectional view of a vacuum sealing device for a vacuum high-pressure gas quenching furnace.

[0020] In the figure, cylinder body 1, sealing flange seat 2, retaining ring 3, piston rod sealing ring 4, lip sealing ring 5, first O-ring 6, second O-ring 7, flange cover 8, furnace shell flange 9, first connecting bolt 10, first nut 11, bolt 12, second connecting bolt 13, second nut 14, cylinder front end cover flange 15, vacuum high-pressure gas quenching furnace body 17, cylinder piston rod 18, hot zone hatch 19, pin 20, flange seat extension section 21, and joint 22. DETAILED DESCRIPTION

[0021] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments.

[0022] Please see attached Figure 1A vacuum sealing device for a vacuum high-pressure gas quenching furnace comprises a sealing flange seat 2, a flange cover 8, a furnace shell flange 9, a dynamic sealing assembly and a static sealing assembly; the furnace shell flange 9 is welded and installed at the opening and closing opening of the hot zone hatch 19 of the vacuum high-pressure gas quenching furnace body 17, and the flange cover 8 is fixedly installed on the furnace shell flange 9; a flange seat extension section 21 is formed at the bottom of the sealing flange seat 2, and a through hole for the flange seat extension section 21 to penetrate and install is formed on the flange cover 8, so that the sealing flange seat 2 is located above the flange cover 8, and the flange cover 8 is fixedly installed on the furnace shell flange 9 through the static sealing assembly. The sealing assembly is statically sealed with the flange seat extension section 21 and the furnace shell flange 9; the cylinder piston rod assembly is installed on the sealing flange seat 2 and sequentially penetrates the sealing flange seat 2, the flange seat extension section 21, the flange cover 8, and the furnace shell flange 9 and is inserted into the vacuum high-pressure gas quenching furnace body 17; the hot zone hatch 19 is located in the vacuum high-pressure gas quenching furnace body 17 and is connected to the cylinder piston rod assembly; the dynamic sealing assembly is arranged in the flange seat extension section 21, so that the cylinder piston rod assembly is dynamically sealed with the flange seat extension section 21 through the dynamic sealing assembly.

[0023] The moving part of the cylinder piston rod assembly is placed in the sealing flange seat 2, the flange cover 8, and the furnace shell flange 9, and the dynamic sealing assembly provides dynamic sealing protection for the cylinder piston rod assembly during the linear reciprocating motion relative to the flange seat extension section 21, and the static sealing assembly provides static sealing protection between the flange cover 8 and the sealing flange seat 2 and the furnace shell flange 9. Compared with the dynamic sealing method of the traditional O-ring, the dynamic seal + static seal of the utility model can greatly improve the reliability of the vacuum seal, realize the sealing effect of the cylinder piston rod assembly during long-term linear reciprocating motion, and meet the requirements of the vacuum high-pressure gas quenching furnace for high pressure and high vacuum sealing in the furnace.

[0024] Preferably, the flange seat extension section 21 can be integrally formed with the sealing flange seat 2, and the sealing flange seat 2, the flange seat extension section 21, the flange cover 8, and the furnace shell flange 9 are used for installing the cylinder piston rod assembly on the vacuum high-pressure gas quenching furnace body 17.

[0025] The cylinder piston rod assembly drives the hot zone hatch cover 19 to make linear reciprocating motion, so that the process of opening or closing the hot zone hatch cover 19 on the vacuum high-pressure gas quenching furnace body 17 is the same as the opening and closing process of the hot zone hatch cover in the prior art, which will not be repeated here.

[0026] The dynamic sealing assembly includes a piston rod sealing ring 4 and a lip sealing ring 5, both of which are sealed between the cylinder piston rod assembly and the inner wall of the flange seat extension section 21, and piston rod sealing rings 4 are provided above and below the lip sealing ring 5.

[0027] The piston rod seal ring 4 and the lip seal ring 5 provide multiple dynamic seal protections for the linear reciprocating motion of the cylinder piston rod assembly, thereby improving the dynamic seal reliability of the cylinder piston rod assembly. Compared with the traditional O-ring seal, it has higher sealing reliability and durability.

[0028] Preferably, the piston rod sealing ring 4 and the lip sealing ring 5 can be made of high-temperature resistant rubber material, and the sizes of the piston rod sealing ring 4 and the lip sealing ring 5 can be adaptively adjusted according to actual installation requirements to ensure that the piston rod sealing ring 4 and the lip sealing ring 5 are tightly sealed between the outer wall of the cylinder piston rod 18 and the inner wall of the flange seat extension section 21.

[0029] The lip seal rings 5 ​​are provided with two lip seal rings 5 ​​at intervals, and the two lip seal rings 5 ​​are both located between the two piston rod seal rings 4, and the two lip seal rings 5 ​​are installed in opposite directions.

[0030] By means of the two lip seal rings 5 ​​installed in opposite directions, bidirectional sealing of positive pressure and negative pressure can be achieved, thereby further improving the sealing effect of high pressure and high vacuum in the vacuum high pressure gas quenching furnace.

[0031] A retaining ring 3 is provided on the top of the flange seat extension section 21 , and the retaining ring 3 is located above a piston rod sealing ring 4 above.

[0032] The retaining ring 3 can provide a limit for the piston rod sealing ring 4 to prevent the piston rod sealing ring 4 from moving upward and falling out of the flange seat extension section 21 .

[0033] The static sealing assembly includes a first O-ring 6 and a second O-ring 7. The inner wall of the through hole of the flange cover 8 is statically sealed to the outer wall of the flange seat extension section 21 through the first O-ring 6, and the bottom surface of the flange cover 8 is statically sealed to the top surface of the furnace shell flange 9 through the second O-ring 7.

[0034] The flange cover 8 and the flange seat extension 21 are statically sealed by the first O-ring 6, and the flange cover 8 and the furnace shell flange 9 are statically sealed by the second O-ring 7, which ensures the sealed installation of the sealing flange seat 2, the flange cover 8 and the furnace shell flange 9 with the vacuum high-pressure gas quenching furnace body 17. At the same time, the flange seat extension 21, the flange cover 8 and the furnace shell flange 9 provide a sealed movement space for the moving part of the cylinder piston assembly, and even if the dynamic sealing assembly fails, the reliable seal between the cylinder piston assembly and the vacuum high-pressure gas quenching furnace body 17 can be ensured.

[0035] The sealing flange seat 2, flange cover 8 and furnace shell flange 9 are all formed with a plurality of screw holes. The flange cover 8 is fixedly connected to the furnace shell flange 9 via a first connecting bolt 10 through a first nut 11. The sealing flange seat 2, flange cover 8 and furnace shell flange 9 are fixedly connected via a second connecting bolt 13 through a second nut 14.

[0036] The number and position of the screw holes on the sealing flange seat 2, the flange cover 8 and the furnace shell flange 9 can be adaptively adjusted according to actual connection requirements. Preferably, the second connecting bolt 13 is longer and can be used to simultaneously connect the sealing flange seat 2, the flange cover 8 and the furnace shell flange 9. The first connecting bolt 10 is shorter and can be used to connect the flange cover 8 and the furnace shell flange 9, which is convenient for disassembly, replacement and maintenance.

[0037] The cylinder piston rod assembly comprises a cylinder body 1, a cylinder piston rod 18, a pin 20 and a joint 22; the cylinder body 1 is mounted on a sealing flange seat 2, one end of the cylinder piston rod 18 is arranged in the cylinder body 1, and the other end of the cylinder piston rod 18 sequentially passes through the sealing flange seat 2, the flange seat extension section 21, the flange cover 8, and the furnace shell flange 9 and is then inserted into the vacuum high-pressure gas quenching furnace body 17; the cylinder piston rod 18 is dynamically sealedly connected to the flange seat extension section 21 through a dynamic sealing assembly, and the hot zone hatch cover 19 is connected to the other end of the piston rod 18 through a pin 20 through a joint 22.

[0038] Preferably, the joint 22 can adopt a Y-type joint according to the actual installation and movement requirements of the hot zone hatch 19. The air pressure change of the cylinder body 1 provides power for the cylinder piston rod 18, which is used to control the cylinder piston rod 18 to make linear reciprocating motion. While the cylinder piston rod 18 drives the hot zone hatch 19 to move synchronously, the opening and closing actions on the vacuum high-pressure gas quenching furnace body 17 are realized through the rotation of the joint 22 and the pin shaft 20.

[0039] A cylinder front end cover flange 15 is provided at the bottom of the cylinder body 1 , and the cylinder front end cover flange 15 is fixedly mounted on the sealing flange seat 2 by bolts 12 .

[0040] The cylinder body 1 is connected to the sealing flange seat 2 via the cylinder front end cover flange 15 , and the flange connection ensures the reliability and sealing of the connection part, thereby further ensuring the sealing of the movement process of the cylinder piston rod 18 .

[0041] The cylinder body 1, the sealing flange seat 2, the retaining ring 3 of the dynamic sealing assembly, the piston rod sealing ring and the lip sealing ring 5, the first O-ring 6 of the static sealing assembly, the flange cover 8, the furnace shell flange 9, the cylinder front end cover flange 15 and the cylinder piston rod 18 are coaxially arranged to ensure the dynamic sealing effect of the cylinder piston rod 18 and the static sealing effect of the flange cover 8.

[0042] Please see attached Figure 1 , the working process and working principle of the utility model are:

[0043] When the cylinder body 1 controls the cylinder piston rod 18 to extend and retract, the cylinder piston rod 18 performs linear reciprocating motion in the flange seat extension section 21, and dynamic sealing between the cylinder piston rod 18 and the flange seat extension section 21 can be achieved through two piston rod sealing rings 4 and two lip sealing rings 5.

[0044] The two piston rod seals 4 and the two lip seals 5 can provide four dynamic seals during the long-term and frequent movement of the cylinder piston rod 18, thereby improving the reliability of the dynamic seal. Even if the dynamic seal fails after long-term use, the static sealing performance provided by the first O-ring 6 between the flange seat extension 21 and the flange cover 8 and the second O-ring 7 between the flange cover 8 and the furnace shell flange 9 can ensure the sealing between the cylinder piston assembly and the vacuum high-pressure gas quenching furnace body 17, thereby meeting the use requirements of high vacuum and high pressure without leakage in the vacuum high-pressure gas quenching furnace body 17.

[0045] The above are only preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A vacuum sealing device for a vacuum high-pressure gas quenching furnace, characterized in that: The invention comprises a sealing flange seat (2), a flange cover (8), a furnace shell flange (9), a dynamic sealing assembly and a static sealing assembly; the furnace shell flange (9) is welded and installed at the opening and closing opening of the hot zone hatch cover (19) of the furnace body (17) of a vacuum high-pressure gas quenching furnace, and the flange cover (8) is fixedly installed on the furnace shell flange (9); a flange seat extension section (21) is formed at the bottom of the sealing flange seat (2), and a through hole for the flange seat extension section (21) to penetrate and install is formed on the flange cover (8); the sealing flange seat (2) is located above the flange cover (8), and the flange cover (8) is connected to the flange through the static sealing assembly. The flange seat extension section (21) and the furnace shell flange (9) are statically sealed; the cylinder piston rod assembly is installed on the sealing flange seat (2) and sequentially penetrates the sealing flange seat (2), the flange seat extension section (21), the flange cover (8), and the furnace shell flange (9) before being inserted into the vacuum high-pressure gas quenching furnace body (17); the hot zone hatch (19) is located in the vacuum high-pressure gas quenching furnace body (17) and is connected to the cylinder piston rod assembly; the dynamic sealing assembly is arranged in the flange seat extension section (21), so that the cylinder piston rod assembly is dynamically sealed with the flange seat extension section (21) through the dynamic sealing assembly.

2. The vacuum sealing device for a vacuum high pressure gas quenching furnace according to claim 1, characterized in that: The dynamic sealing assembly comprises a piston rod sealing ring (4) and a lip sealing ring (5), wherein the piston rod sealing ring (4) and the lip sealing ring (5) are both sealingly arranged between the cylinder piston rod assembly and the inner wall of the flange seat extension section (21), and the piston rod sealing ring (4) is arranged above and below the lip sealing ring (5).

3. The vacuum sealing device for a vacuum high pressure gas quenching furnace according to claim 2, characterized in that: The lip-shaped sealing rings (5) are provided with two lip-shaped sealing rings (5) at intervals, the two lip-shaped sealing rings (5) are both located between the two piston rod sealing rings (4), and the two lip-shaped sealing rings (5) are installed in opposite directions.

4. The vacuum sealing device for a vacuum high pressure gas quenching furnace according to claim 2, characterized in that: A retaining ring (3) is provided at the top of the flange seat extension section (21), and the retaining ring (3) is located above an upper piston rod sealing ring (4).

5. The vacuum sealing device for a vacuum high pressure gas quenching furnace according to claim 1, characterized in that: The static sealing assembly comprises a first O-ring (6) and a second O-ring (7); the inner wall of the through hole of the flange cover (8) is statically sealed to the outer wall of the flange seat extension section (21) via the first O-ring (6); the bottom surface of the flange cover (8) is statically sealed to the top surface of the furnace shell flange (9) via the second O-ring (7).

6. The vacuum sealing device for a vacuum high pressure gas quenching furnace according to claim 1, characterized in that: A plurality of screw holes are formed on the sealing flange seat (2), the flange cover (8) and the furnace shell flange (9); the flange cover (8) is fixedly connected to the furnace shell flange (9) via a first connecting bolt (10) and a first nut (11); and the sealing flange seat (2), the flange cover (8) and the furnace shell flange (9) are fixedly connected via a second connecting bolt (13) and a second nut (14).

7. The vacuum sealing device for a vacuum high pressure gas quenching furnace according to claim 2, characterized in that: The cylinder piston rod assembly comprises a cylinder body (1), a cylinder piston rod (18), a pin (20) and a joint (22); the cylinder body (1) is mounted on a sealing flange seat (2), one end of the cylinder piston rod (18) is arranged in the cylinder body (1), and the other end of the cylinder piston rod (18) sequentially passes through the sealing flange seat (2), the flange seat extension section (21), the flange cover (8), and the furnace shell flange (9) and is then inserted into the vacuum high-pressure gas quenching furnace body (17); the cylinder piston rod (18) is dynamically sealedly connected to the flange seat extension section (21) through a dynamic sealing assembly, and the hot zone hatch cover (19) is connected to the other end of the piston rod (18) through a joint (22) and the pin (20).

8. The vacuum sealing device for a vacuum high pressure gas quenching furnace according to claim 7, characterized in that: A cylinder front end cover flange (15) is provided at the bottom of the cylinder body (1), and the cylinder front end cover flange (15) is fixedly mounted on the sealing flange seat (2) by bolts (12).

9. The vacuum sealing device for a vacuum high pressure gas quenching furnace according to claim 7, characterized in that: The cylinder body (1), the sealing flange seat (2), the dynamic sealing assembly, the static sealing assembly, the flange cover (8), the furnace shell flange (9), the cylinder front end cover flange (15) and the cylinder piston rod (18) are coaxially arranged.

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