High-temperature-resistant vacuum flange

Abstract

The utility model discloses a high-temperature-resistant vacuum flange, relates to the field of flanges, and aims to solve the problems that in the prior art, an existing vacuum flange is sealed only by pressing a sealing ring through an upper flange and a lower flange, but the sealing ring is prone to deformation in a high-temperature environment for a long time, and then sealing failure is caused. The lower end of the upper flange is connected with a lower flange, rectangular-section annular limiting grooves are formed in the inner side end faces of the upper flange and the lower flange correspondingly, and trapezoidal-section annular limiting grooves are formed in the positions, on the inner sides of the rectangular-section annular limiting grooves, of the inner side end faces of the upper flange and the lower flange correspondingly. A first sealing ring is jointly arranged in the two rectangular-section annular limiting grooves, a second sealing ring is jointly arranged in the two trapezoidal-section annular limiting grooves, an isosceles-trapezoid-shaped sealing ring is fixedly arranged on the inner side of the second sealing ring, and the sealing rings are automatically adjusted in form under the action of pressure by means of the change of pressure in a pipeline. Tighter attachment is achieved, and the sealing effect is enhanced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of flange, concretely to a high temperature resistant vacuum flange. BACKGROUND

[0002] Flange is an important component for connecting equipment or pipelines, usually made of metal, with a circular disc structure. Its main function is to connect two or more pipelines, equipment or components, to ensure that they are tightly and firmly combined, thereby preventing fluid leakage. Flange connection has the advantages of convenient disassembly, high strength, good sealing, etc., and is widely used in petroleum, chemical, power, metallurgy and other industrial fields. In practical application, flange is usually used with fasteners such as bolts and nuts, and the flange surface is tightly combined by tightening the bolts to achieve sealing effect. Therefore, flange is an indispensable key component in industrial equipment connection, which is of great significance to ensure the safety and stability of industrial production.

[0003] For example, the authorized announcement number CN220688327U, a high sealing vacuum flange, relates to the field of flange technology, including upper flange, the bottom of the upper flange is provided with lower flange, the upper flange and lower flange are provided with sealing device between, the upper flange and lower flange are provided with fixed device periphery, the top of the upper flange is provided with upper pipeline, the upper pipeline extends to the inside of the upper flange, the bottom of the lower flange is provided with lower pipeline, the lower pipeline extends to the inside of the lower flange, the sealing device includes first limit ring and second limit ring, the outer side wall of the first limit ring and the second limit ring corresponding is provided with limit recess, the sealing ring is provided between the two limit recesses, the fixed device includes first fixed plate and second fixed plate, the first fixed plate and the second fixed plate are provided with threaded hole near the corner, compared with the existing high sealing vacuum flange, the protection and practicability of high sealing vacuum flange are improved.

[0004] The existing vacuum flange only seals by pressing the sealing ring between the upper and lower flanges, but the sealing ring is prone to deformation in a high temperature environment for a long time, which leads to sealing failure. Therefore, there is an urgent need to develop a high temperature resistant vacuum flange to help people solve the existing problems. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a high temperature resistant vacuum flange to solve the problem that the existing vacuum flange only seals by pressing the sealing ring between the upper and lower flanges, but the sealing ring is prone to deformation in a high temperature environment for a long time, which leads to sealing failure.

[0006] To achieve the above object, the utility model provides the following technical scheme: A kind of high-temperature resistant vacuum flange, including upper flange and lower flange, the lower end of the upper flange is connected with lower flange, the inner side end face of the upper flange and lower flange is all provided with rectangular cross section annular limit slot, the inner side end face of the upper flange and lower flange is all provided with trapezoidal cross section annular limit slot in rectangular cross section annular limit slot inside, the upper flange and lower flange are connected to make two rectangular cross section annular limit slots and two trapezoidal cross section annular limit slots between alignment and fold, two the rectangular cross section annular limit slot inside is commonly provided with first sealing ring, two the trapezoidal cross section annular limit slot inside is commonly provided with second sealing ring, the inside of the second sealing ring is fixedly provided with isosceles trapezoidal sealing ring.

[0007] Preferably, the upper end of the upper flange is fixedly connected with first pipeline, the lower end of the lower flange is fixedly connected with second pipeline, one side between the two trapezoidal cross section annular limit slots is provided with annular notch, the two trapezoidal cross section annular limit slots are communicated with the inside of first pipeline and second pipeline through annular notch.

[0008] Preferably, the upper flange and lower flange are fixedly connected by a plurality of bolts.

[0009] Preferably, one side of the first pipeline is provided with through hole, the outside of the through hole is fixedly connected with connecting column, the inside of the connecting column is provided with detection rod, one end of the detection rod extends to the inside of first pipeline through the through hole and is fixedly connected with detection head.

[0010] Preferably, the other end of the detection rod extends out one side end face of connecting column and is fixedly connected with connecting plate, the third sealing ring is arranged between the connecting plate and one side end face of connecting column.

[0011] Preferably, the detection rod and connecting column are fixedly connected by screw after passing through connecting plate and third sealing ring in sequence and being inserted into the inside of connecting column.

[0012] Preferably, the detection rod is connected with air pressure detection device after passing through connecting plate.

[0013] Compared with prior art, the utility model has the beneficial effects that:

[0014] (1) in the utility model, by adopting double-layer sealing structure, including the first sealing ring in rectangular cross section annular limit slot and the second sealing ring in trapezoidal cross section annular limit slot and the isosceles trapezoidal sealing ring in its inside, effectively improve the sealing stability and reliability of flange in high temperature environment, significantly reduce the risk of fluid leakage.

[0015] (2) The utility model discloses a pressure change inside the pipeline is utilized, whether vacuum state or conveying state can be through annular gap and conduction to the pressure inside the sealing groove to sealing ring under the pressure action automatic adjustment form, realize more closely fit, to further enhance the sealing effect.

[0016] (3) The utility model discloses a detection rod and detection head real -time monitoring pipeline internal pressure change, provide the powerful guarantee for the stability and safety of flange connection, simultaneously, this design is convenient for the potential leakage problem of timely discovery and processing, improve the whole system's operating efficiency and security. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is the front view of a high temperature resistant vacuum flange of the utility model;

[0018] Figure 2 It is the main sectional view of the utility model;

[0019] Figure 3 It is the side sectional view of the utility model;

[0020] Figure 4 It is the A detail enlarged view of the utility model;

[0021] Figure 5 It is the B detail enlarged view of the utility model.

[0022] In the drawing: 1, upper flange;101, first pipeline;102, through -hole;103, connecting column;2, lower flange;201, rectangular cross section annular limit slot;202, trapezoidal cross section annular limit slot;203, annular gap;204, first sealing ring;205, bolt;206, second pipeline 206;3, second sealing ring;301, isosceles trapezoidal sealing ring;4, detection rod;401, detection head;402, connecting plate;403, third sealing ring;404, screw;405, air pressure detection device. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the utility model will be apparently and completely described with reference to the drawings in the embodiments of the utility model, and obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments.

[0024] Please refer to Figures 1-5The utility model provides an embodiment: a kind of high temperature resistant vacuum flange, including upper flange 1 and lower flange 2, lower flange 2 is connected to the lower end of upper flange 1, and upper flange 1 and lower flange 2 are fixedly connected by multiple bolts 205 between, and the inside end face of upper flange 1 and lower flange 2 is all provided with rectangular cross section annular limit slot 201, and the inside end face of upper flange 1 and lower flange 2 is all provided with trapezoidal cross section annular limit slot 202 in the inside of rectangular cross section annular limit slot 201, after upper flange 1 and lower flange 2 are connected, the alignment of two rectangular cross section annular limit slots 201 and the alignment of two trapezoidal cross section annular limit slots 202 are folded, first sealing ring 204 is commonly arranged in the inside of two rectangular cross section annular limit slots 201, and the primary sealing between upper flange 1 and lower flange 2 is carried out by first sealing ring 204, second sealing ring 3 is commonly arranged in the inside of two trapezoidal cross section annular limit slots 202, and isosceles trapezoidal sealing ring 301 is fixedly arranged in the inside of second sealing ring 3, first pipeline 101 is fixedly connected to the upper end of upper flange 1, second pipeline 206 is fixedly connected to the lower end of lower flange 2, annular gap 203 is arranged between two trapezoidal cross section annular limit slots 202, and two trapezoidal cross section annular limit slots 202 are communicated with the inside of first pipeline 101 and second pipeline 206 by annular gap 203, the secondary sealing between upper flange 1 and lower flange 2 is carried out by second sealing ring 3, when being in vacuum environment in the inside of first pipeline 101 and second pipeline 206, vacuum is conducted to the inside of two trapezoidal cross section annular limit slots 202 by annular gap 203, so that isosceles trapezoidal sealing ring 301 is contracted under the action of vacuum, when contracting, two inclined planes of isosceles trapezoidal sealing ring 301 respectively extrude the inclined plane in the inside of two trapezoidal cross section annular limit slots 202 to realize further sealing, when being in conveying state in the inside of first pipeline 101 and second pipeline 206, conveying pressure is conducted to the inside of two trapezoidal cross section annular limit slots 202 by annular gap 203, so that second sealing ring 3 is expanded under the action of conveying pressure, and then the gap between the outside end face of second sealing ring 3 and the vertical side end face of two trapezoidal cross section annular limit slots 202 is fitted to realize further sealing.

[0025] Please refer to Figure 2 And Figure 5The first pipeline 101 is provided with a through hole 102 on one side, a connecting column 103 is fixedly connected outside the through hole 102, a detection rod 4 is arranged in the connecting column 103, the detection rod 4 is fixedly connected with a detection head 401 extending into the first pipeline 101 through the through hole 102 on one end, a connecting plate 402 is fixedly connected on the other end of the detection rod 4 extending out of the side end face of the connecting column 103, a third sealing ring 403 is arranged between the connecting plate 402 and the side end face of the connecting column 103, the connecting plate 402 and the connecting column 103 are sealed through the third sealing ring 403, the detection rod 4 and the connecting column 103 are fixedly connected through a screw 404 inserted into the connecting column 103 after the screw 404 passes through the connecting plate 402 and the third sealing ring 403 in sequence, and a gas pressure detection device 405 is connected to the detection rod 4 after the detection rod 4 passes through the connecting plate 402, so that the gas pressure detection device 405 can monitor the pressure in the first pipeline 101 in real time through the detection head 401 connected to the detection rod 4.

[0026] Working principle: in use, first of all, the upper flange 1 and the lower flange 2 are tightly connected through the bolt 205, at this time, the first sealing ring 204 is located between the two rectangular cross-section annular limiting grooves 201 to provide primary sealing. At the same time, the second sealing ring 3 and the isosceles trapezoidal sealing ring 301 inside the second sealing ring 3 are located between the two trapezoidal cross-section annular limiting grooves 202 to form secondary sealing. When the first pipeline 101 and the second pipeline 206 are in a vacuum environment, the vacuum state is conducted to the inside of the trapezoidal cross-section annular limiting groove 202 through the annular gap 203, so that the isosceles trapezoidal sealing ring 301 shrinks under the action of the vacuum to tightly fit the inclined surface of the trapezoidal cross-section annular limiting groove 202, further enhancing the sealing effect. On the contrary, in the conveying state, the internal pressure of the pipeline is also conducted to the trapezoidal cross-section annular limiting groove 202 through the annular gap 203, so that the second sealing ring 3 expands under the action of the pressure, and the outer side end face of the second sealing ring 3 tightly fits the vertical side end face of the trapezoidal cross-section annular limiting groove 202 to ensure the sealing property. In addition, the gas pressure detection device 405 monitors the pressure change in the first pipeline 101 in real time through the detection rod 4 and the detection head 401 to ensure the stability and safety of the flange connection, effectively solving the problem that the sealing ring is prone to deformation in a high-temperature environment for a long time, resulting in sealing failure.

[0027] It is obvious for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and the present application can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be regarded as limiting the claims.

Claims

1. A high-temperature-resistant vacuum flange comprising an upper flange (1) and a lower flange (2), characterized in that: The lower flange (2) is connected to the lower end of the upper flange (1), rectangular cross-section annular limiting grooves (201) are arranged on the inner end faces of the upper flange (1) and the lower flange (2), trapezoidal cross-section annular limiting grooves (202) are arranged on the inner end faces of the upper flange (1) and the lower flange (2) and inside the rectangular cross-section annular limiting grooves (201), the upper flange (1) and the lower flange (2) are connected to align and fold the two rectangular cross-section annular limiting grooves (201) and the two trapezoidal cross-section annular limiting grooves (202), the first sealing ring (204) is arranged inside the two rectangular cross-section annular limiting grooves (201), the second sealing ring (3) is arranged inside the two trapezoidal cross-section annular limiting grooves (202), and the isosceles trapezoidal sealing ring (301) is fixedly arranged inside the second sealing ring (3).

2. The high-temperature-resistant vacuum flange according to claim 1, characterized in that: The first pipeline (101) is fixedly connected to the upper end of the upper flange (1), the second pipeline (206) is fixedly connected to the lower end of the lower flange (2), the annular notch (203) is arranged on one side between the two trapezoidal cross-section annular limiting grooves (202), and the two trapezoidal cross-section annular limiting grooves (202) are in communication with the interiors of the first pipeline (101) and the second pipeline (206) through the annular notch (203).

3. The high-temperature-resistant vacuum flange according to claim 1, characterized in that: The upper flange (1) and the lower flange (2) are fixedly connected through a plurality of bolts (205).

4. The high-temperature-resistant vacuum flange according to claim 2, characterized in that: The through hole (102) is arranged on one side of the first pipeline (101), the connecting column (103) is fixedly connected to the outside of the through hole (102), the detection rod (4) is arranged in the connecting column (103), and the detection head (401) is fixedly connected to one end of the detection rod (4) extending to the interior of the first pipeline (101) through the through hole (102).

5. The high-temperature-resistant vacuum flange according to claim 4, characterized in that: The other end of the detection rod (4) extends out of the side end face of the connecting column (103) and is fixedly connected with the connecting plate (402), and the third sealing ring (403) is arranged between the connecting plate (402) and the side end face of the connecting column (103).

6. The high-temperature-resistant vacuum flange according to claim 5, characterized in that: The detection rod (4) and the connecting column (103) are fixedly connected through the screw (404) inserted into the interior of the connecting column (103) after sequentially penetrating the connecting plate (402) and the third sealing ring (403).

7. The high-temperature-resistant vacuum flange according to claim 6, characterized in that: The air pressure detection device (405) is connected to one end of the detection rod (4) penetrating the connecting plate (402).

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