A comprehensive gas heating test device with high airtightness, vibration resistance, heat resistance, stress and deformation

Abstract

The present invention proposes a comprehensive gas heating test device with high airtightness, vibration resistance, heat resistance, stress and deformation, including a front airtight chamber, a bellows, a test piece, a rear airtight chamber and an electromagnetic induction heating device; the air intake pipe and the exhaust pipe are fixed in the airtight chamber by welding and sealing sleeves respectively, and the bellows is connected to the test piece by a flange. The airtight chamber mainly plays the role of gas rectification and pipeline diameter reduction. Under the premise of ensuring airtightness, the air supply connecting pipe at one end is fixed for ventilation. The other end of the air supply connecting pipe is connected to the test piece. The low-temperature end is usually a bellows with a flange or bayonet. The other end of the bellows is connected to the test heating section, providing a relatively free end constraint for the heating section, reducing the vibration and local constraint of the test piece caused by gas flow, and reducing the concentration effect of stress at the low-temperature constraint. After the gas is heated by the electromagnetic induction device in the heating section, it is discharged through the rear airtight chamber.

Description

Technical Field

[0001] The present invention relates to the technical field of high-temperature and high-pressure gas testing, and in particular to a comprehensive gas heating testing device with high airtightness, vibration resistance, heat resistance, stress and deformation. Background Art

[0002] In recent years, people have grown dissatisfied with low- and room-temperature testing and have begun designing test equipment and circuits for high-temperature environments. However, existing equipment and high-constraint connection methods are unable to withstand the thermal stresses that materials experience in high-temperature environments. In similar high-temperature tests, high-temperature, high-pressure gas must be continuously introduced. When the equipment is heated, the inconsistent temperature changes between its surface and inner layers create a temperature difference, which leads to uneven volume expansion and thermal stress. When the stress exceeds the elastic limit of the material, it can cause deformation or even rupture. After the equipment cools, it is subjected to cooling thermal stress during the cooling process. Repeated high-intensity thermal stress can cause serious damage to the equipment and create safety hazards. If a low-constraint connection method is used to reduce the harm of thermal stress, poor sealing will occur. Summary of the Invention

[0003] In order to overcome the problems existing in the above-mentioned prior art, the purpose of the present invention is to provide a comprehensive gas heating test device with high airtightness, vibration resistance, heat resistance, stress and deformation, which can provide relatively free end constraints for the heating section while ensuring airtightness, reduce the vibration and local constraint of the test piece caused by gas flow, and reduce the concentration effect of stress at the low-temperature constraint.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0005] A comprehensive gas heating test device with high airtightness, vibration resistance, heat resistance, stress and deformation, comprises a front airtight chamber 1, a bellows 2, a test piece 3, a rear airtight chamber 5 and an electromagnetic induction heating device 4; the bellows 2 is connected between the outlet of the front airtight chamber 1 and two adjacent test pieces 3, and the two sides of the bellows 2 are normal circular tubes to connect the front airtight chamber 1 and the test piece 3. The outlet of the last test piece is connected to the rear airtight chamber 5. An electromagnetic induction heating device 4 is arranged around each test piece 3. The zoned arrangement of the electromagnetic induction heating device 4 can apply different heating powers to different positions of the test piece to simulate the actual power distribution change process of the heating section; alternating current generates an alternating magnetic field through the electromagnetic induction coil, which excites the tube wall of the test piece 3 to generate alternating current and heat, thereby heating the gas; the inlet of the front airtight chamber 1 is connected to the air intake channel, and the rear airtight chamber 5 is connected to the exhaust channel; thermocouple temperature measurement areas are set in the front airtight chamber 1 and the rear airtight chamber 5.

[0006] Preferably, the outside of the test piece 3 surrounded by the electromagnetic induction heating device 4 is coated with high-temperature resistant insulating material to protect the electromagnetic induction heating device 4 from being burned; if a high-power electromagnetic induction heating device is used, a water cooling circuit is provided in the electromagnetic induction heating device to connect to an external water cooling device.

[0007] Preferably, the air inlet pipe end of the bellows 2 is fixed to the front airtight chamber 1 through a graphite sealing ferrule 6, and the outlet end of the last test piece is fixed to the rear airtight chamber 5 through a graphite sealing ferrule 6. The front airtight chamber 1 and the rear airtight chamber 5 are respectively fixed with the air inlet channel and the air outlet channel by welding to ensure air tightness.

[0008] Preferably, the electromagnetic induction heating device 4 is an electromagnetic induction copper coil.

[0009] Preferably, the front airtight chamber 1 and the rear airtight chamber 5 are both columnar.

[0010] Preferably, the bellows 2 and the test piece 3 are connected by a flange.

[0011] The advantages of the present invention are: first, compared with direct connection, the present invention adopts an airtight chamber connection. Due to the existence of the airtight chamber, under the premise of ensuring airtightness, the inlets and outlets of different pipe diameters can be well connected, and the effect of gas rectification is played. Secondly, a section of bellows is used for connection with the heating test piece. Due to the micro-compressibility of the bellows, the vibration and local constraint of the test piece caused by gas flow can be weakened, and the concentration effect of stress at the low-temperature constraint can be reduced. Finally, since the electromagnetic induction heating device used has the characteristic of being partitioned, different powers can be applied to different positions of the test piece to simulate the actual power distribution change process of the heating section. Electromagnetic induction heating solves the problem of low efficiency of the resistive heating method. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 Schematic diagram of the overall structure of the test device of the present invention;

[0013] Figure 2 This is a schematic diagram of the connection between the airtight chamber structure and the bellows of the present invention;

[0014] Figure 3 It is a cross-sectional view of the test device of the present invention.

[0015] The components in the accompanying drawings are marked as follows: 1-front airtight chamber, 2-bellows, 3-test piece, 4-electromagnetic heating device, 5-rear airtight chamber, 6-graphite sealing ferrule. DETAILED DESCRIPTION

[0016] like Figure 1 and Figure 3As shown, the present invention is a comprehensive gas heating test device with high airtightness, vibration resistance, heat resistance, stress and deformation, including a front airtight chamber 1, a bellows 2, a test piece 3, a rear airtight chamber 5 and an electromagnetic induction heating device 4. In this embodiment, the front airtight chamber 1 and the rear airtight chamber 5 are cylindrical and are provided with thermocouple temperature measurement areas. The bellows 2 is connected to the outlet of the front airtight chamber 1 and between two adjacent test pieces 3. The two sides of the bellows are normal circular tubes to connect the front airtight chamber 1 and the test piece 3. The outlet of the last test piece is connected to the rear airtight chamber 5. An electromagnetic induction heating device 4 is arranged around each test piece 3. The partitioned arrangement of the electromagnetic induction heating device 4 can apply different heating powers to different positions of the test piece to simulate the actual power distribution change process of the heating section; the alternating current generates an alternating magnetic field through the electromagnetic induction coil, which excites the tube wall of the test piece 3 to generate alternating current and heat, thereby heating the gas; the inlet of the front airtight chamber 1 is connected to the air intake channel, and the rear airtight chamber 5 is connected to the exhaust channel.

[0017] The key to the present invention is that a section of bellows 2 is connected between the front airtight chamber 1 and the test piece 3, and between each test piece 3. Due to the micro-compressibility of the bellows, it can provide relatively free end constraints for the heating section, reduce the vibration of the test piece and the local constraint caused by gas flow, and reduce the concentration effect of stress at the low-temperature constraint.

[0018] The specific installation method is as follows: the air inlet channel is fixed to the interior of the front airtight chamber 1 by welding, the bellows 2 is fixed to the interior of the front airtight chamber 1 by a graphite sealing ferrule 6, the front end of the test piece 3 is connected to the bellows 2 by a flange, the electromagnetic induction heating device 4 is wrapped around the test piece 3, the rear end is connected to the rear airtight chamber 5 and fixed by a graphite sealing ferrule 6, the exhaust channel is welded inside the rear airtight chamber 5, and the inner diameter of the pipe can be freely selected. The airtight chamber is provided with an area for installing thermocouples to measure the inlet and outlet medium temperatures. The medium gas enters the front airtight chamber 1 from the air inlet channel, is rectified in the airtight chamber, enters the test piece 3 through the bellows 2, is heated by the electromagnetic induction heating device 4, and then enters the rear airtight chamber 5 for rectification and discharge.

[0019] Figure 2 The figure shows the specific connection method between the front airtight chamber and the bellows. Normal round tubes are connected to both sides of the bellows. The front end is fixed in the front airtight chamber through a graphite sealing sleeve 6, and the rear end is connected to the test piece through a flange.

[0020] The specific implementation method is as follows: after the installation is completed, the medium used is first introduced to expel the internal air, and then the electromagnetic induction heating device is put into use to generate a magnetic field inside the pipe wall to generate heat, and the power of the electromagnetic induction heating device is adjusted according to actual needs to heat the medium to the required temperature.

[0021] Application Example 1

[0022] Through simulations, the present invention employed a tungsten tube with a diameter of 3 mm, a wall thickness of 1.5 mm, and a length of 1 m as the test piece. The medium used was helium. The helium inlet flow rate was 0.4 g / s, the inlet temperature was 600 K, and the electromagnetic induction heating device provided 3000 W of gas heating power with a cosine power input shape. CFD calculations revealed a total outlet temperature of 1934.8 K, a total outlet pressure of 1 MPa, and an internal pressure drop of 0.07 MPa. Theoretically, the test section experienced a maximum thermal stress of 22.6 MPa, occurring on the inner wall of the tube, well below the yield limit of the test material.

[0023] Application Example 2

[0024] Through simulations, the present invention employed an ODS steel pipe with a diameter of 6 mm, a wall thickness of 1 mm, and a length of 1 m as the test piece. The medium used was nitrogen. The nitrogen inlet flow rate was 20 g / s, the inlet temperature was 600 K, and the electromagnetic induction heating device provided a gas heating power of 20,613 W, with a cosine power input shape. CFD calculations revealed an outlet total temperature of 1,490.5 K, an outlet total pressure of 1.8 MPa, and an internal pressure drop of 0.2 MPa. Theoretically, the test section exhibited a maximum thermal stress of 163.12 MPa, occurring on the inner wall of the pipe and below the yield limit of the test material.

[0025] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention's description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A comprehensive gas heating test device with high airtightness, vibration resistance, heat resistance, stress and deformation, characterized by: The invention comprises a front airtight chamber (1), a bellows (2), a test piece (3), a rear airtight chamber (5) and an electromagnetic induction heating device (4); the bellows (2) is connected to the outlet of the front airtight chamber (1) and between two adjacent test pieces (3); both sides of the bellows (2) are normal circular tubes so as to connect the front airtight chamber (1) and the test piece (3); the outlet of the last test piece is connected to the rear airtight chamber (5); an electromagnetic induction heating device (4) is arranged around each test piece (3); and the partitioned arrangement of the electromagnetic induction heating device (4) can apply different heating powers to different positions of the test piece to simulate the actual power distribution change process of the heating section; The alternating current generates an alternating magnetic field through the electromagnetic induction coil, which excites the tube wall of the test piece (3) to generate alternating current and heat, thereby heating the gas; the inlet of the front airtight chamber (1) is connected to the air intake channel, and the rear airtight chamber (5) is connected to the exhaust channel; the front airtight chamber (1) and the rear airtight chamber (5) are provided with thermocouple temperature measurement areas; The inlet pipe end of the bellows (2) is fixed to the front airtight chamber (1) via a graphite sealing ferrule (6), and the outlet end of the last test piece is fixed to the rear airtight chamber (5) via a graphite sealing ferrule (6). The front airtight chamber (1) and the rear airtight chamber (5) respectively fix the inlet channel and the outlet channel in a welding manner to ensure airtightness; The front airtight chamber (1) and the rear airtight chamber (5) are both columnar.

2. A comprehensive gas heating test device with high airtightness, vibration resistance, heat resistance, stress and deformation according to claim 1, characterized in that: The outside of the test piece (3) surrounded by the electromagnetic induction heating device (4) is coated with a high temperature resistant insulating material to protect the electromagnetic induction heating device (4) from being burned out; if a high power electromagnetic induction heating device is used, a water cooling circuit is provided inside the electromagnetic induction heating device and connected to an external water cooling device.

3. A comprehensive gas heating test device with high airtightness, vibration resistance, heat resistance, stress and deformation according to claim 1, characterized in that: The electromagnetic induction heating device (4) is an electromagnetic induction copper coil.

4. A comprehensive gas heating test device with high airtightness, vibration resistance, heat resistance, stress and deformation according to claim 1, characterized in that: The bellows (2) and the test piece (3) are connected by a flange.

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