Sealing mechanism for quick-opening door of autoclave

Abstract

The sealing mechanism comprises a kettle opening, a kettle cover and a hoop enabling the sealing end face of the kettle cover to be tightly attached to the annular end face of the kettle opening, a circular sealing boss capable of being inserted into the kettle opening is arranged on the kettle cover, and the outer circumferential face of the circular sealing boss is in inserted sealing fit with the sealing face of the inner wall of the kettle opening. A first sealing ring groove and a second sealing ring groove are sequentially formed in the outer circumferential face of the circular sealing boss in the direction from the kettle opening to the kettle bottom, an O-shaped sealing ring is installed in the first sealing ring groove, and a spring seal with an opening facing the kettle bottom is installed in the second sealing ring groove. A discharge hole for discharging leaked liquid between the first sealing ring groove and the second sealing ring groove from the kettle cover is also formed in the kettle cover; and a discharge connecting pipe communicated with the discharge hole is arranged on the outer wall of the kettle cover. According to the sealing mechanism, the sealing lip of the spring seal can be fully opened within a short time, the sealing effect is achieved, and liquid leaked before effective sealing is not formed in the spring seal at the initial stage of pressure boosting can be collected in a centralized mode.

Description

Technical Field

[0001] The utility model relates to a sealing mechanism for an autoclave, in particular to a sealing mechanism for an autoclave which adopts a quick-opening door mode for loading and unloading materials. Background Art

[0002] Carbon dioxide foaming, supercritical extraction, and drying require the use of autoclaves, which usually use a quick-opening door structure to seal the autoclave mouth. By setting a sealing ring groove on the autoclave cover and embedding an O-ring in the sealing ring groove, the quick-opening door can be sealed. However, the pressure-bearing capacity of the O-ring is limited, and repeated exposure to high temperature and high pressure will accelerate the aging of the O-ring. The pan-seal is a high-performance seal with a special spring inside a U-shaped Teflon. The appropriate spring force plus the system fluid pressure pushes the sealing lip out and presses tightly against the sealed metal surface to produce a very excellent sealing effect. However, when the pan-seal is used for the quick-opening door seal of the autoclave, there are the following defects: in the initial stage of pressure increase, since the sealing lip requires a certain pressure to fully open and fit tightly with the metal surface to achieve a sealing effect, the sealing lip of the pan-seal has not yet fully opened in the initial stage of pressure increase, and the liquid in the autoclave will leak through the tiny gap between the sealing lip and the metal surface. The leaked liquid will overflow along the contact surface between the autoclave cover and the autoclave mouth, which is not only difficult to collect, but also poses a risk of environmental pollution and is not conducive to safe production. Utility Model Content

[0003] The technical problem to be solved by the utility model is: to overcome the above-mentioned defects of the prior art and provide a sealing mechanism for a high-pressure autoclave quick-opening door, which can fully open the sealing lip of the flood seal in a short time to achieve a sealing effect, and can centrally collect the liquid leaked by the flood seal before an effective seal is formed in the initial stage of pressure increase.

[0004] The technical solution adopted to solve the technical problem: a sealing mechanism for a high-pressure autoclave quick-opening door, comprising a autoclave mouth, a autoclave cover that cooperates with the annular end face of the autoclave mouth to close the autoclave mouth, and a clamp that makes the sealing end face of the autoclave cover tightly fit with the annular end face of the autoclave mouth, a circular sealing boss that can be inserted into the autoclave mouth is provided on the autoclave cover, the outer circumferential surface of the circular sealing boss is plugged and sealed with the sealing surface of the inner wall of the autoclave mouth, a first sealing ring groove and a second sealing ring groove are sequentially opened on the outer circumferential surface of the circular sealing boss along the direction from the autoclave mouth to the autoclave bottom, an O-ring is installed in the first sealing ring groove, a pan-plug seal with an opening toward the autoclave bottom is installed in the second sealing ring groove, a discharge hole is also provided in the autoclave cover for discharging leaked liquid between the first sealing ring groove and the second sealing ring groove from the autoclave cover, and a discharge pipe connected with the discharge hole is provided on the outer wall of the autoclave cover.

[0005] As a further improvement of the present invention: the second sealing ring groove is a stepped ring groove arranged along the outer edge of the end surface of the circular sealing boss.

[0006] As a further improvement of the utility model: a retaining ring is arranged on the end face of the circular sealing boss to prevent the flood seal from falling off, and the retaining ring is fixed on the end face of the circular sealing boss by bolts.

[0007] As a further improvement of the utility model: the inner wall sealing surface of the kettle mouth is a conical sealing surface with an outer end diameter larger than an inner end diameter, and the circular sealing boss is a frustum that seals with the inner wall sealing surface of the kettle mouth.

[0008] As a further improvement of the utility model: a discharge valve is installed at the end of the discharge connecting pipe.

[0009] As a further improvement of the utility model: a discharge ring groove is formed on the outer circumferential surface of the circular sealing boss between the first sealing ring groove and the second sealing ring groove, and the opening of the discharge hole in the kettle is located in the discharge ring groove.

[0010] Beneficial effects: The sealing mechanism of the high-pressure autoclave quick-opening door of the utility model adopts a circular sealing boss that can be inserted into the autoclave mouth on the autoclave cover, the outer circumferential surface of the circular sealing boss is plugged and sealed with the sealing surface of the inner wall of the autoclave mouth, the outer circumferential surface of the circular sealing boss is sequentially provided with a first sealing ring groove and a second sealing ring groove along the direction from the autoclave mouth to the autoclave bottom, an O-ring is installed in the first sealing ring groove, and a pan-plug seal with an opening toward the autoclave bottom is installed in the second sealing ring groove, and a first sealing ring groove and a second sealing ring groove are also provided in the autoclave cover. The leaked liquid between the two is discharged from the discharge hole of the kettle cover, and the outer wall of the kettle cover is provided with a discharge pipe connected to the discharge hole. By setting an O-ring, the leakage formed at the pan-plug seal in the initial stage of pressure increase is prevented from leaking out along the annular contact end surface of the kettle cover and the kettle mouth. By setting the discharge hole in the kettle cover, the disadvantage that the pressure on both sides of the pan-plug seal is the same and it is difficult to open quickly and fully due to the addition of the O-ring can be prevented, so that the sealing mechanism of the utility model can fully open the sealing lip of the pan-plug seal in a short time to achieve the sealing effect. In addition, the discharge pipe can also collect the leaked liquid before the pan-plug seal forms an effective seal in the initial stage of pressure increase. Due to the technical feature that the second sealing ring groove is a stepped ring groove set along the outer edge of the end surface of the circular sealing boss, the installation of the pan-plug seal is more convenient, and the disadvantages of the difficulty of installing the pan-plug seal and the easy damage of the pan-plug seal can be overcome. Due to the technical feature that a retaining ring is installed on the end face of the circular sealing boss to prevent the pan-seal from falling off, and the retaining ring is fixed to the end face of the circular sealing boss by bolts, the pan-seal can be prevented from falling off during the opening and closing process of the quick-opening door without affecting the sealing effect of the pan-seal. Due to the technical feature that the inner wall sealing surface of the kettle mouth is a conical sealing surface with an outer end diameter greater than the inner end diameter, and the circular sealing boss is a cone-shaped cone that seals with the inner wall sealing surface of the kettle mouth, the sealing effect of the kettle mouth and the kettle cover is better. Due to the technical feature that a discharge valve is installed at the end of the discharge pipe, the liquid discharge between the two seals can be conveniently controlled. When the pan-seal is fully opened and the seal is formed, the discharge valve is closed, and the liquid leaked after the pan-seal fails during the pressure relief process in the kettle can be prevented from flowing out through the discharge pipe. Due to the technical feature that a discharge ring groove is provided on the outer circumferential surface of the circular sealing boss between the first sealing ring groove and the second sealing ring groove, and the opening of the discharge hole in the kettle is located in the discharge ring groove, the leaked liquid between the first sealing ring groove and the second sealing ring groove can more easily enter the discharge hole, and in the process of discharging the leaked liquid, the pressure distribution at each point in the circumferential direction of the pan-plug seal is more uniform, and the expansion effect of the sealing lip is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The sealing mechanism of the autoclave quick-opening door of the utility model is further described in detail below in conjunction with the accompanying drawings.

[0012] Figure 1It is an axial cross-sectional view of the sealing mechanism of the autoclave quick-opening door of the utility model;

[0013] Figure 2 It is an enlarged cross-sectional view of a flood seal portion in a sealing mechanism for a high-pressure autoclave quick-opening door of the utility model. DETAILED DESCRIPTION

[0014] like Figure 1 The sealing mechanism of the quick-opening door of the autoclave of the utility model comprises an autoclave mouth 6, an autoclave cover 9 which cooperates with the annular end face 7 of the autoclave mouth to close the autoclave mouth, and a clamp 8 which makes the sealing end face of the autoclave cover tightly fit with the annular end face of the autoclave mouth. The autoclave cover is provided with a circular sealing boss 5 which can be inserted into the autoclave mouth, and the outer circumferential surface of the circular sealing boss is plugged and sealed with the sealing surface 14 of the inner wall of the autoclave mouth.

[0015] like Figure 2 As shown, the first sealing ring groove 15 and the second sealing ring groove 12 are sequentially opened on the outer circumferential surface of the circular sealing boss along the direction from the kettle mouth to the kettle bottom, an O-ring 10 is installed in the first sealing ring groove, and a pan-seal 13 with an opening toward the kettle bottom is installed in the second sealing ring groove. A discharge hole 2 is also provided in the kettle cover to discharge the leaked liquid between the first sealing ring groove and the second sealing ring groove from the kettle cover, one end of the discharge hole is opened on the outer circumferential surface of the circular sealing boss between the first sealing ring groove and the second sealing ring groove, and the other end is opened on the outer end surface of the kettle cover. A discharge pipe 1 connected to the discharge hole is provided on the outer wall of the kettle cover, and a discharge valve is provided at the end of the discharge pipe.

[0016] The second sealing ring groove is a stepped ring groove arranged along the outer edge of the end face of the circular sealing boss. A retaining ring 3 is arranged on the end face of the circular sealing boss to prevent the flood seal from falling off, and the retaining ring is fixed on the end face of the circular sealing boss by bolts 4.

[0017] Preferably, the inner wall sealing surface 14 of the kettle mouth is a conical sealing surface with an outer end diameter larger than an inner end diameter, and the circular sealing boss 5 is a frustum that seals with the inner wall sealing surface of the kettle mouth.

[0018] A discharge ring groove 11 is provided on the outer circumferential surface of the circular sealing boss between the first sealing ring groove and the second sealing ring groove. The opening of the discharge hole in the kettle is located in the discharge ring groove. The leaked liquid between the two sealing ring grooves flows into the discharge ring groove and then discharged, so that the pressure on each point of the flood seal in the circumferential direction is more uniform, which is conducive to the rapid and uniform expansion of the sealing lip and the formation of an effective seal.

[0019] The utility model discloses a sealing mechanism for a high-pressure autoclave quick-opening door. When the pressure in the autoclave is increased, the discharge valve is opened to form a pressure difference on both sides of the flood seal, so that the pressure liquid in the autoclave quickly expands the two sealing lips to form a seal. This overcomes the disadvantage that when there is no discharge hole structure, the pressure on both sides of the flood seal is equal, and the sealing lips are difficult to expand or expand slowly.

Claims

1. A sealing mechanism for a quick-opening door of an autoclave, comprising an autoclave opening, an autoclave cover that cooperates with an annular end face of the autoclave opening to seal the autoclave opening, and a clamp that makes the sealing end face of the autoclave cover fit tightly with the annular end face of the autoclave opening, wherein: The kettle cover is provided with a circular sealing boss which can be inserted into the kettle mouth, the outer circumferential surface of the circular sealing boss is plugged and sealed with the sealing surface of the inner wall of the kettle mouth, a first sealing ring groove and a second sealing ring groove are sequentially opened on the outer circumferential surface of the circular sealing boss along the direction from the kettle mouth to the bottom of the kettle, an O-ring is installed in the first sealing ring groove, a pan-plug seal with an opening toward the bottom of the kettle is installed in the second sealing ring groove, a discharge hole for discharging leaked liquid between the first sealing ring groove and the second sealing ring groove from the kettle cover is also provided in the kettle cover, and a discharge pipe connected with the discharge hole is provided on the outer wall of the kettle cover.

2. The sealing mechanism for the quick-opening door of an autoclave according to claim 1, characterized in that: The second sealing ring groove is a stepped ring groove arranged along the outer edge of the end surface of the circular sealing boss.

3. The sealing mechanism for the quick-opening door of an autoclave according to claim 2 is characterized in that: A retaining ring is arranged on the end surface of the circular sealing boss to prevent the flood seal from falling off, and the retaining ring is fixed on the end surface of the circular sealing boss by bolts.

4. The sealing mechanism for the quick-opening door of an autoclave according to any one of claims 1 to 3, characterized in that: The inner wall sealing surface of the kettle mouth is a conical sealing surface with an outer end diameter larger than an inner end diameter, and the circular sealing boss is a frustum that seals with the inner wall sealing surface of the kettle mouth.

5. The sealing mechanism for the quick-opening door of an autoclave according to claim 4 is characterized in that: A discharge valve is installed at the end of the discharge pipe.

6. The sealing mechanism for the quick-opening door of an autoclave according to claim 5, characterized in that: A discharge ring groove is formed on the outer circumferential surface of the circular sealing boss between the first sealing ring groove and the second sealing ring groove, and the opening of the discharge hole in the kettle is located in the discharge ring groove.

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