A cavity sealing device suitable for inductive heating within a closed cavity

Abstract

The application discloses a cavity sealing device suitable for inductive heating in a closed cavity, which comprises a ceramic substrate, the ceramic substrate is sealingly connected with the closed cavity, a first pipe and a second pipe are respectively arranged on the left side and the right side of the ceramic substrate, a gap is formed between the two pipes and the ceramic substrate to form a cavity, and the first pipe and the second pipe are respectively provided with a first sealing ring, a second sealing ring and a third sealing ring, the end of the first pipe is provided with an elastic structure which is in contact with the second pipe, the first pipe and the second pipe are further connected with a fastener, and the first pipe and the second pipe are both split conical structures which are hollow and communicated, the inner diameter of the second pipe is matched with the outer diameter of the first pipe; during operation, the conical structure is pressed to compress the edge sealing gasket to strengthen the sealing through the pressure difference between the inside and the outside of the closed cavity, the closed cavity can adapt to the case that the pressure in the cavity is less than or greater than the atmospheric pressure outside, the current conduction is ensured, the circumferential sealing ring ensures the flow of cooling water in the pipeline, the ceramic substrate is made of non-conductive ceramic material and can realize overall sealing, and the problem that the existing sealing device can only be used in a single pressure field is effectively solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of mechanical manufacturing, in particular to a mechanical sealing device. BACKGROUND

[0002] Induction heating refers to the heating by the electric resistance heat generated by the eddy current in the part under the action of the magnetic field generated by the alternating current as the heat source when the conductive part is close to the time-varying magnetic field. Some parts to be heated are chemically active at high temperature, and need to be processed in a sealed cavity by isolating oxygen, carbon dioxide, hydrogen or other related gases, or by filling a specific gas to maintain a certain gas atmosphere. The internal pressure of the cavity is different in different processing occasions, which may be lower than the atmospheric pressure to achieve a certain degree of negative pressure relative to the outside world, or may be higher than the atmospheric pressure to achieve a certain degree of positive pressure relative to the outside world.

[0003] The alternating current required for induction heating needs to be generated by a specific device. Due to the large size, the need for cooling and other factors, this device cannot be placed in a sealed cavity in most cases, so it is necessary to introduce the current generated by the device into the cavity through a certain conduction device. In addition, the whole heating system needs to be cooled by cooling water, so water flow is needed. This device cannot damage the sealing of the cavity while realizing the conduction of current and the circulation of water flow during operation.

[0004] The cavity is generally made of a material that is chemically stable in air or a protective gas that can be filled, and has sufficient strength to withstand the pressure difference to maintain the stability of the structure. The material of the cavity is mostly metal material, and certain measures need to be taken to isolate and avoid heating the metal cavity during induction heating. Ceramic material can be used as an isolation material due to its high strength and non-conductivity.

[0005] The common sealing device that is pressed by a fastener through a single flange and a sealing ring has the problem that it can only be used in one pressure situation: the gas pressure in the cavity is greater than or less than the atmospheric pressure. SUMMARY

[0006] To solve the above problems, the present application discloses a cavity sealing device suitable for induction heating in a sealed cavity.

[0007] The specific technical solution is as follows:

[0008] A cavity sealing device suitable for inductive heating in a closed cavity, comprising a ceramic substrate, the ceramic substrate and the closed cavity are connected by a metal seal, the left and right sides of the ceramic substrate are respectively provided with a first pipe and a second pipe, the first pipe is connected with a heating power supply, the second pipe is connected with a heating ring, there is a gap between the first pipe and the second pipe and the ceramic substrate to form a cavity, and the first pipe and the second pipe are provided with a first sealing ring, a second sealing ring and a third sealing ring, and the end of the first pipe is provided with an elastic structure which also contacts the second pipe.

[0009] The first sealing ring is located between the first pipe and the closed cavity, the second sealing ring is located between the second pipe and the closed cavity, and the third sealing ring is located at the part where the first pipe is inserted into the second pipe.

[0010] The first pipe and the second pipe are provided with fasteners above and below

[0011] The first pipe and the second pipe are in a split structure, and the first pipe and the second pipe are hollow and communicate with each other to form a channel.

[0012] The first pipe and the second pipe are both in a conical structure, and the two ends of the first pipe and the second pipe are both in a cylindrical structure, and the middle section is provided with a conical body structure.

[0013] The inner diameter of the pipeline of the second pipe and the outer diameter of the corresponding part of the first pipe are matched.

[0014] The advantages of the present application are:

[0015] 1. The conical structure of the sealing device in the closed cavity is pressed against the edge sealing ring by the pressure difference between the inside and outside of the closed cavity, which strengthens the sealing based on the original sealing and further reduces the leakage probability.

[0016] 2. When the internal pressure of the cavity is less than the external atmospheric pressure, the reinforced sealing can be realized, and when the internal pressure of the cavity is greater than the external atmospheric pressure, the reinforced sealing can also be realized.

[0017] 3. The end of the conical structure on one side is a structure with a certain elasticity, which ensures that the components in the device always maintain contact during axial movement and ensures the conduction of current.

[0018] 4. The end of the pipe on one side is inserted into the other side, and the circumferential sealing is realized by the annular sealing ring, which ensures that the cooling water flows in the pipeline without spilling.

[0019] 5. The substrate is a non-conductive ceramic material, which can be connected with other parts of the cavity through metal bolts to realize overall sealing. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a schematic cross-sectional view of the sealing device as a whole.

[0021] Figure 2 A schematic view of the connection of the first pipe and the second pipe;

[0022] Figure 3 A schematic view of the structure of the first pipe;

[0023] Figure 4 A schematic view of the implementation of the device. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0025] A cavity sealing device suitable for inductive heating in a sealed cavity, comprising a ceramic substrate 1, the ceramic substrate 1 is sealingly connected with the sealed cavity, the left and right sides of the ceramic substrate 1 are respectively provided with a first pipe 2 and a second pipe 6, the first pipe 2 is connected with a heating power supply 8, the second pipe is connected with a heating coil 12, there is a gap between the first pipe 2 and the second pipe 6 and the ceramic substrate to form a cavity, the first pipe 2 and the second pipe 6 are provided with a first sealing ring 3, a second sealing ring 5 and a third sealing ring 7, the end of the first pipe is provided with an elastic structure 14, and the elastic structure 14 also contacts the second pipe.

[0026] The first sealing ring 3 is located between the first pipe 2 and the sealed cavity, the second sealing ring 5 is located between the second pipe 6 and the sealed cavity, and the third sealing ring 7 is located at the part of the first pipe 2 inserted into the second pipe 6.

[0027] The first pipe 2 and the second pipe 6 are provided with fasteners 4 above and below.

[0028] The first pipe 2 and the second pipe 6 are in a split structure, and the first pipe 2 and the second pipe 6 are hollow inside and communicate with each other to form a channel.

[0029] The first pipe 2 and the second pipe 6 are both in a conical structure, and the two ends of the first pipe 2 and the second pipe 6 are both in a cylindrical structure, and the middle section is provided with a conical body structure.

[0030] The inner diameter of the pipeline of the second pipe 6 and the outer diameter of the pipeline corresponding to the first pipe 2 are matched with each other.

[0031] The working principle of the present application is that the sealing device is installed on the closed cavity 11 by metal fasteners, the first pipe is connected to the induction heating power supply 8, and the second pipe is connected to the heating coil 12. The tubular titanium alloy to be heated 13 is placed in the heating coil 12. As shown in the figure, 9 is a sealing port, and 10 is a sealing bolt;

[0032] The fastener 4 can be a bolt or other workpiece that can rotate spirally, for example, the pre-tightening bolt in the figure provides a certain amount of pre-tightening force, which does not completely compress the sealing ring, and provides a running space for the differential pressure driven reinforced sealing;

[0033] Negative pressure state (when vacuumizing)

[0034] When the closed cavity is vacuumized to 1×10 -3 Pa, the gas pressure is less than the external atmospheric pressure to form a negative pressure environment. At this time, a pressure difference is generated due to the atmospheric pressure of the gas in the cavity. Under the action of this pressure difference, the conical structure of the second pipe moves to the right, so that the second sealing ring is relaxed, and the internal sealing structure is temporarily disabled. At the same time, the gas in the cavity enters the closed cavity and is drawn out. There is also a pressure difference between the left and right of the external conical structure of the first pipe. Under the action of this pressure difference, the external conical structure moves to the left, compresses the first sealing ring, and thus realizes reinforced sealing. Through such structural design and pressure difference action, the sealing performance of the device under negative pressure state is ensured.

[0035] After heating experiment, the temperature is heated to 1000℃ and kept for 5 minutes, and the titanium alloy pipe does not oxidize, which indicates that there is no gas leakage and the sealing is stable, verifying the effectiveness and reliability of the sealing device under negative pressure state.

[0036] Positive pressure state (when filling argon)

[0037] When the closed cavity is filled with 1.2×105 Pa of argon as a protective gas, the pressure directly acts on the conical structure of the second pipe, pushing it to move to the left and compressing the second sealing ring to achieve reinforced sealing. This automatic reinforced sealing method using the change of cavity pressure effectively meets the sealing demand under positive pressure environment.

[0038] Similarly, after heating experiment to 1000℃ and keeping for 5 minutes, the titanium alloy pipe does not oxidize, which indicates that there is no gas leakage and the sealing is stable. And there is no water leakage phenomenon during the heating process, which indicates that the circumferential sealing ring can move axially with the pipe and always maintain the sealing of water between the pipe and the pipe, and the circumferential sealing is good, which further reflects that the device not only has good gas sealing under positive pressure state, but also can effectively ensure the sealing of cooling water, so as to ensure the normal operation and stability of the whole device during the heating process.

Claims

1. A chamber sealing device suitable for use in inductively heating a sealed chamber, characterized by: The application relates to a ceramic substrate and a sealed cavity, the left and right sides of the ceramic substrate are respectively provided with a first pipe and a second pipe, the first pipe is connected with a heating power supply, the second pipe is connected with a heating ring, gaps exist between the first pipe and the second pipe and the ceramic substrate to form a cavity, first, second and third sealing rings are arranged on the first pipe and the second pipe, the end of the first pipe is provided with an elastic structure, and the elastic structure also contacts the second pipe. The first sealing ring is located between the conical body of the first pipe and the sealed cavity, the second sealing ring is located between the conical body of the second pipe and the sealed cavity, and the third sealing ring is located at the part where the first pipe is inserted into the second pipe.

2. A chamber sealing device suitable for induction heating within a sealed chamber according to claim 1, characterized in that: Fasteners are arranged above and below the first pipe and the second pipe.

3. A chamber sealing device suitable for induction heating within a sealed chamber according to claim 1, characterized in that: The first pipe and the second pipe are in a split structure, and the first pipe and the second pipe are hollow and communicate with each other to form a channel.

4. A chamber sealing arrangement suitable for induction heating within a sealed chamber according to claim 3, characterised in that: The first pipe and the second pipe are both in a conical structure, and the two ends of the first pipe and the second pipe are both in a cylindrical structure, and the middle section is provided with a conical body structure.

5. A chamber sealing arrangement suitable for induction heating within a sealed chamber according to claim 4, characterised in that: The inner diameter of the pipeline of the second pipe and the outer diameter of the pipeline corresponding to the first pipe are matched.

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