Air jacket insulation explosion-proof oven

Abstract

The invention discloses an air jacket heat-insulating explosion-proof oven. The oven comprises a heating system, the heating system comprises a liquid phase circulation loop and a gas phase circulation loop, the liquid phase circulation loop comprises a heater, a pump and a heat exchanger, and the gas phase circulation loop comprises a heat exchanger, a fan and a jacket liner. The explosion-proof oven achieves significant energy saving, improves the stability and safety of the oven, and realizes unattended operation.

Description

Technical Field

[0001] The invention belongs to a product for baking, drying or temperature testing flammable and explosive articles in the industrial and scientific research fields, and relates to an explosion-proof oven, in particular to an air jacket insulation explosion-proof oven. Background Art

[0002] In production and scientific research, it is often necessary to carry out high-temperature baking, drying or testing of flammable and explosive items. An explosion-proof oven is a known device that can be applied to this test. At present, an explosion-proof oven usually includes a heating tube (or steam tube) immersed in a liquid heat-conducting medium (oil or water), which relies on the temperature of the medium to increase and then transfer the heat to the working room for indirect heating. However, this type of oven has the disadvantages of long temperature stabilization time, high energy consumption, and easy pollution and aging of the working medium. In addition, according to safety requirements, when flammable and explosive items are powered on and work continuously, the intensity of manual work is very high, and stability and safety become key issues affecting the application of such ovens. Therefore, it is urgent to develop an explosion-proof oven with improved heating performance, stability and / or safety. Summary of the invention

[0003] In order to improve the above technical problems, the present invention provides an explosion-proof oven, which includes a heating system, the heating system includes a liquid phase circulation loop and a gas phase circulation loop, the liquid phase circulation loop includes a heater, a pump and a heat exchanger, and the gas phase circulation loop includes a heat exchanger, a fan and a jacket liner.

[0004] According to an embodiment of the present invention, the liquid phase circulation loop may contain a liquid phase heat transfer medium, and the liquid phase heat transfer medium may be oil or water, preferably heat transfer oil or heat carrier oil.

[0005] According to an embodiment of the present invention, in the liquid phase circulation loop, the heater, pump and heat exchanger constitute a circulation loop. Those skilled in the art should understand that there is no special limitation on the specific position of the pump in the liquid phase circulation loop, and it can be set as needed, as long as it can make the liquid phase heat transfer medium circulate in the liquid phase circulation loop, especially between the heater and the heat exchanger; preferably, the pump is set as close to the heat exchanger and the heater as possible to reduce the heat loss of the pipeline. As an example, the liquid phase circulation loop includes a heater, a pump and a heat exchanger connected in sequence to form a loop. Furthermore, the outlet of the heater is connected to the inlet of the pump, the outlet of the pump is connected to the liquid inlet of the heat exchanger, and the liquid outlet of the heat exchanger is connected to the inlet of the heater.

[0006] According to an embodiment of the present invention, the heater may be an explosion-proof heater, for example, the heater is a shell and tube heater. Preferably, the shell and tube heater has a cylindrical structure, which can ensure that all heating media completely flow through the surface of the heater. Preferably, the power of the heater can be 70-130kW, for example 80-110kW, and as an example, the power of the heater is 90kW.

[0007] According to an embodiment of the present invention, the pump may be a water pump or an oil pump, for example, an explosion-proof high-temperature oil pump may be selected.

[0008] According to an embodiment of the present invention, in the gas phase circulation loop, the heat exchanger, the fan and the jacket liner constitute a circulation loop. Those skilled in the art should understand that there is no special limitation on the specific position of the fan in the gas phase circulation loop, and it can be set as needed, as long as it can make the gas circulate in the gas phase circulation loop, especially between the heat exchanger and the jacket liner; preferably, the fan is set as close to the heat exchanger and the jacket liner as possible to reduce the heat loss of the pipeline. As an example, the gas phase circulation loop includes a heat exchanger, a jacket liner and a fan connected in sequence to form a loop. Furthermore, the air outlet of the heat exchanger is connected to the air inlet of the jacket liner, the air outlet of the jacket liner is connected to the air inlet of the fan, and the air outlet of the fan is connected to the air inlet of the heat exchanger.

[0009] According to an embodiment of the present invention, the heat exchangers in the liquid phase circulation loop and the gas phase circulation loop may be the same or different. When the heat exchangers are the same, it means that the liquid phase circulation loop and the gas phase circulation loop share a heat exchanger. Preferably, when the liquid phase circulation loop and the gas phase circulation loop share a heat exchanger, they respectively form a closed loop with the heat exchanger. When the heat exchangers are different, the heating system may include an additional heat exchanger to achieve heat exchange between different heat exchangers.

[0010] According to the embodiment of the present invention, the heat exchanger completes the function of transferring the heat energy of the liquid medium to the gas medium. The liquid medium obtains heat energy through the heater, and flows through the internal pipe of the heat exchanger through a liquid phase closed loop under the action of the pump; the gas phase medium (air) flows through the surface of the internal pipe of the heat exchanger under the action of the fan, obtains heat energy and heats up, and also forms a gas phase closed loop with the inner liner of the studio jacket, transferring heat to the aluminum plate, and the heat of the aluminum plate heats up the studio through radiation conduction.

[0011] According to an embodiment of the present invention, the heat exchanger includes a liquid phase pipeline and a gas phase pipeline, the liquid phase pipeline is arranged in the gas phase pipeline, and the liquid phase pipeline is preferably a finned tube, such as a finned tube with a diameter of 20-30 mm. As an example, the liquid phase tube is a finned tube with a diameter of 22 mm. Further, the material of the finned tube can be aluminum. Further, the inlet of the liquid phase pipeline is connected to the outlet of the pump, the outlet of the liquid phase pipeline is connected to the inlet of the heater, the inlet of the gas phase pipeline is connected to the air outlet of the fan, and the outlet of the gas phase pipeline is connected to the jacket liner. Further, the heat exchange area of ​​the heat exchanger can be 300-400m 2 , for example 320-380m 2 As an example, the heat exchange area can be 330m 2 、350m 2 、360m 2 Furthermore, the ratio of the heat exchange area of ​​the heat exchanger to the inner volume (i.e., the working chamber volume) can be 0.2-0.4m 2 / L, for example 0.24-0.35m 2 / L, as an example, the ratio can be 0.25m 2 / L, 0.3m 2 / L.

[0012] According to an embodiment of the present invention, the jacket liner includes an inner liner and a jacket located outside the inner liner. Preferably, the jacket includes 2 or more layers of metal plates. Preferably, the metal plates are not in direct contact with each other, for example, they are arranged at intervals to form a cavity. Preferably, the distance between the two metal plates can be selected in the range of 40-60mm according to the volume of the studio, for example, the distance between the two metal plates can be 40mm, 50mm, 60mm.

[0013] According to an embodiment of the present invention, the cavity between the metal plates is an air duct.

[0014] According to an embodiment of the present invention, a fixing component and / or a supporting component may be provided on the metal plate to form a cavity or an air duct. As an example, the fixing component and / or the supporting component may be a metal component, and its material may be the same as or different from that of the metal plate.

[0015] According to an embodiment of the present invention, the air inlet of the jacket liner is connected to the air duct. For example, it is arranged so that the hot air output by the heat exchanger enters the air duct.

[0016] According to a preferred embodiment of the present invention, the metal plate can be an aluminum plate or other metal materials, such as carbon steel, etc., preferably an aluminum plate.

[0017] According to a preferred embodiment of the present invention, at least a portion of the jacket may be disposed along the outer surface of the inner liner. For example, the jacket is disposed on the wall of the inner liner. Preferably, the jacket covers the left and right side walls of the inner liner and contacts the outer surface of the inner liner. The jacket may or may not contact the outer surface of the inner liner. For example, the metal plate of the jacket close to the inner liner may or may not contact the outer surface of the inner liner. As an example, the outer surface of the inner liner may be the outer surface of its upper wall, lower wall, left side wall and / or right side wall, preferably the outer surface of the left side wall and / or right side wall.

[0018] According to a preferred embodiment of the present invention, when the metal plate close to the inner liner is not in contact with the outer surface of the inner liner, the metal plate close to the inner liner and the outer surface of the inner liner may also form a cavity or an air duct. Those skilled in the art should understand that in this case, a fixing component and / or a supporting component may be further provided on the metal plate and / or the inner liner to form a cavity or an air duct. At the same time, in order to ensure the realization of the working room temperature technical indicators, the cavity or jacket formed in the inner liner wall is in a U-shaped state, and the size and path of the air duct are formed through sufficient experiments.

[0019] According to a preferred embodiment of the present invention, one, two or more through holes may be provided on the wall of the inner liner close to the jacket (eg, the left wall and / or the right wall) to communicate with the cavity and the air duct in the jacket.

[0020] According to an embodiment of the present invention, the heating system may further include a power support, and the heater, fan and pump may be arranged inside the power support, that is, the power support is a support for centrally and layeredly installing various functional components (heater, heat exchanger, pump, fan), thereby realizing product integration under the premise of compact structure, safety and convenience.

[0021] According to an embodiment of the present invention, a damper is provided on one side of the power support, and the damper is used to open and close the airflow in the gas phase circulation loop: the damper is fully open during normal operation; it is closed when it is necessary to shut down and keep warm, cutting off the heat dissipation path and enhancing the heat preservation effect. Furthermore, a switch can be provided on the damper or at other locations to control the opening and closing of the damper.

[0022] According to an embodiment of the present invention, an air inlet and an air outlet are arranged on the inner liner of the jacket, the air inlet is connected to the outlet of the fan, and the air outlet is connected to the gas phase pipeline of the heat exchanger.

[0023] According to an embodiment of the present invention, the heater may be disposed above the power support.

[0024] According to an embodiment of the present invention, a liquid phase heat transfer medium storage tank (such as a subsidiary oil tank) can be arranged above the heater to replenish the liquid phase heat transfer medium as needed. Preferably, a liquid level protection meter can be connected to the subsidiary oil tank to monitor the liquid level in the subsidiary oil tank; at the same time, the temperature of the liquid surface (surface in contact with the air) of the heating medium (heat transfer oil) is ensured not to be too high during operation to prevent the medium from aging.

[0025] According to an embodiment of the present invention, the heating system comprises a box body, and the jacket liner is arranged inside the box body.

[0026] According to an embodiment of the present invention, a first through hole and a second through hole are provided on the upper portion of the box body, and a third through hole and a fourth through hole are provided on the upper portion of the jacket liner. Preferably, the first through hole and the third through hole are connected by a first connecting pipe. Preferably, the second through hole and the fourth through hole are connected by a second connecting pipe.

[0027] According to an embodiment of the present invention, an explosion-proof membrane may be provided on the first through hole. When the pressure in the box exceeds the safety threshold, the explosion-proof membrane will be broken first to ensure the safety of the box. The second through hole is used as a test hole for setting a sensor to detect parameters in the box. For example, a temperature sensor may be provided to detect the temperature inside the box during operation.

[0028] According to an embodiment of the present invention, a heat-insulating layer may be further provided in the interlayer of the outer wall of the explosion-proof oven.

[0029] According to an embodiment of the present invention, the insulation material used for the insulation layer can be selected according to the maximum design operating temperature of the oven, for example, selected from materials such as ultra-fine glass wool and / or phenolic insulation board.

[0030] According to an embodiment of the present invention, the box body may be provided with a box door. Preferably, the box door may be provided with an observation window to observe the condition of the sample in the oven.

[0031] According to an embodiment of the present invention, the explosion-proof oven may further include a control system, and the control system is arranged on the outer surface of the box body. Preferably, the control system includes a power supply circuit and a PLC central controller electrically connected to the power supply circuit, and the power supply circuit includes a load switch, a contactor and a solid-state relay, etc. Further, the control system may also include a human-machine interface. The temperature value is set according to work needs, and the temperature input sensor is placed at the air inlet position of the inner tank. The power of the explosion-proof heater is controlled through the SCR output to achieve the purpose of temperature control. The PLC central controller is used to manage and control the display instruments, actuators (SCR, control valves, etc.) of each level of temperature, and the switch electrical appliances of the power supply circuit.

[0032] According to an embodiment of the present invention, the PLC system controller is electrically connected to the heat exchanger, heater, pump, and fan. Preferably, the damper and auxiliary oil tank are both electrically connected to the PLC system controller.

[0033] If there is no special limitation in this specification, such as the connection between the box door and the box body, the connection between the box body and the jacket liner, etc., connection methods known to those skilled in the art may be used.

[0034] Beneficial effects:

[0035] The explosion-proof oven of the present invention unexpectedly greatly reduces the use of liquid phase heat conducting medium, and only 1 / 10 of the amount used in existing ovens is required to achieve the oven function. In addition, the required heating power is reduced by more than 40%, which significantly reduces energy consumption. In addition, using the explosion-proof oven of the present invention, the time required to reach a stable temperature in the jacket liner can be shortened by 50%, and the insulation time reaches more than 14 hours. Furthermore, the uniformity of the oven temperature is ±2% and the fluctuation is ±0.5°C. To this end, the explosion-proof oven achieves significant energy saving while improving the stability and safety of the oven, and realizes unattended operation.

[0036] Furthermore, the explosion-proof oven of the present invention uses two independent closed-loop cycles to achieve efficient heating of the inner tank, while avoiding possible contamination caused by direct contact of the heat transfer oil with the inner tank, thereby reducing the weight of the oven to the maximum extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 1 is a working principle diagram of the explosion-proof oven described in Example 1 of the present invention.

[0038] Figure 2 It is a front view of the explosion-proof oven described in Example 1 of the present invention.

[0039] Figure 3 It is a side view of the explosion-proof oven described in Example 1 of the present invention.

[0040] Figure 4 1 is a top view of the explosion-proof oven described in Example 1 of the present invention.

[0041] Figure 5 It is a schematic diagram of the explosion structure of the explosion-proof oven described in Example 1 of the present invention.

[0042] Figure 6 yes Figure 5 Schematic diagram of the structure of the aluminum jacket liner.

[0043] Figure markings: 1-box door, 2-box body, 3-control system, 4-aluminum jacket liner, 5-power support, 6-shell and tube heater, 7-heat exchanger, 8-fan, 9-oil pump, 10-auxiliary oil tank, 11-first through hole, 12-second through hole, 13-third through hole, 14-fourth through hole, 15-explosion-proof membrane, 16-damper, 17-insulation layer, 18-liquid level protection meter, 19-aluminum liner, 20-jacket, 21-air duct, 22-first connecting pipe, 23-second connecting pipe, 24-explosion-proof membrane, 25-air inlet, 26-air outlet. DETAILED DESCRIPTION

[0044] The technical scheme of the present invention will be further described in detail below in conjunction with specific embodiments. It should be understood that the following embodiments are only exemplary descriptions and explanations of the present invention and should not be construed as limiting the scope of protection of the present invention. All technologies implemented based on the above content of the present invention are included in the scope that the present invention is intended to protect.

[0045] Unless otherwise specified, the raw materials and reagents used in the following examples are commercially available or can be prepared by known methods.

[0046] Parts Information:

[0047] Fan: CY type, Mitsukoshi Electric Co., Ltd.

[0048] Oil pump: WG type, Huizhou Ward Hardware & Electrical Co., Ltd.

[0049] Heat exchanger: The liquid phase end is made of φ22 finned aluminum tubes, with a heat exchange area of ​​330m 2 .

[0050] Shell and tube heater: rated power 90kW.

[0051] PLC central controller: Siemens S7-200;

[0052] Heat transfer oil: Great Wall 320.

[0053] Example 1

[0054] like Figure 2-5 The explosion-proof oven shown includes a heating system and a control system. The heating system includes: a box body 2, a box door 1 installed on the box body 2, an aluminum jacket liner 4 located inside the box body 2, a power support 5 located behind the box body 2, and a heat exchanger 7, a fan 8 and an oil pump 9 arranged inside the power support 5, a shell and tube heater 6 arranged above the power support 5, an auxiliary oil tank 10 located above the shell and tube heater 6, and a damper 16 located on one side of the power support 5. A liquid level protection meter 18 is connected to the auxiliary oil tank 10.

[0055] like Figure 1As shown, the heating system includes two circulation loops: a liquid phase circulation loop and a gas phase circulation loop. The liquid phase circulation loop is composed of a shell and tube heater 6, an oil pump 9 and a heat exchanger 7 connected in sequence, and the gas phase circulation loop is composed of a heat exchanger 7, an aluminum jacket liner 4 and a fan 8 connected in sequence. Among them, the oil pump is an explosion-proof oil pump, the fan is an explosion-proof fan, the shell and tube heater is an explosion-proof shell and tube heater, and the shell and tube heater has a cylindrical structure.

[0056] like Figure 6 As shown, the aluminum jacket liner 4 is composed of an aluminum liner (volume 1.3m 3 )19 and a jacket 20 located outside the inner liner 19, the jacket 20 is composed of three layers of aluminum plates and an air duct 21 formed between the plates, and the spacing between the plates is 40mm. The hot air output by the heat exchanger 17 enters the air duct 21. Fixing members and supporting members are arranged between the plates to reinforce and separate the metal plates. A number of air holes are arranged on the left and right walls of the inner liner 19. An air inlet 25 and an air outlet 26 are arranged on the aluminum jacket inner liner 4, the air inlet 25 is connected to the outlet of the fan 8, and the air outlet 26 is connected to the gas phase duct of the heat exchanger 17. The cavity formed in the inner liner wall and the jacket are U-shaped.

[0057] The upper part of the box body 2 is provided with a first through hole 11 and a second through hole 12, and the upper part of the aluminum jacket liner 4 is provided with a third through hole 13 and a fourth through hole 14. The positions of the first through hole 11 and the third through hole 13 correspond to each other and are connected by a first connecting pipe 22. The positions of the second through hole 12 and the fourth through hole 14 correspond to each other and are connected by a second connecting pipe 23. An explosion-proof membrane 15 is provided on the first through hole 11. The second through hole 12 is used as a test hole for setting a temperature sensor to detect the temperature inside the oven when it is working.

[0058] The explosion-proof oven further comprises a heat-insulating layer 17, which is arranged in an interlayer inside the outer wall of the box body. The heat-insulating material used for the heat-insulating layer is ultra-fine glass wool.

[0059] The control system 3 of the explosion-proof oven is arranged on one side of the box body 2. The control system 3 includes a power supply circuit and a PLC central controller electrically connected to the power supply circuit. The power supply circuit includes a load switch, a contactor, and a solid-state relay. The control system also includes a human-machine interface. The temperature value is set according to the work needs. The temperature input sensor is placed at the air inlet of the inner tank. The power of the explosion-proof heater is controlled through the SCR output to achieve the purpose of temperature control. The PLC central controller is electrically connected to the heat exchanger, heater, oil pump, fan, damper and auxiliary oil tank respectively, and also manages and controls the display instruments, actuators (SCR, control valves) of each level of temperature, and the switch electrical appliances of the power supply circuit.

[0060] Example 2

[0061] The explosion-proof oven of Example 1 is used to dry the sample (millet of the same volume is selected as the simulated sample according to the characteristics of the explosive). After the heat transfer oil is rapidly heated by the shell and tube heater, it is forced to circulate into the fin tube in the heat exchanger by the oil pump. The circulating airflow flows through the fins under the strong push of the fan to be heated, and enters the jacket circulation duct for continuous closed-loop circulation.

[0062] The cylindrical structure of the shell and tube heater ensures that all the heating medium can flow completely through the surface of the heater, thereby greatly reducing the amount of liquid phase heat transfer medium used (only 1 / 10 of the amount used in existing oven products), greatly reducing the required heating power, and greatly improving the heating efficiency (test sample 1.3m 3 The power of the studio heater is reduced by 40%); the application of the jacketed multi-layer aluminum plate structure fully utilizes the physical characteristics of metal aluminum, which absorbs heat quickly and has a large heat capacity. The studio heating time is shortened by 50%, and the energy storage is high after power failure, achieving long-term energy-free insulation. The time for the studio to reach stability is shortened from 3 hours to 1.5 hours, and the studio temperature uniformity and fluctuation indicators are also improved. Among them, the temperature indicators (uniformity and fluctuation) are tested in accordance with the requirements of the enterprise standard QB1106-2012 "Technical Conditions for Explosion-proof Drying Ovens". According to the aforementioned test model prototype, it is fully in line with the standard requirements after testing.

[0063] Test process: In the studio, 9 temperature sensors are arranged for 9-point testing, 1 of which is placed at the geometric center of the studio, and the other 8 are arranged at the corners of the studio, and the distance is 1 / 6 of the corresponding side length. The matching multi-point patrol temperature detector records the test results for analysis, monitoring the heating time, fluctuation and uniformity. Among them, the heating time refers to the time taken by the studio to rise from 35°C to 150°C; the fluctuation and uniformity indicators are that after the studio reaches the set temperature and keeps the temperature constant for 2 hours, the values ​​of each temperature point are read in turn at intervals of 1min, for a total of 30 sets of data, and the absolute value of the difference between the maximum and minimum values ​​of the test point temperature is taken, and the ± sign is added as the temperature fluctuation of the test point; the average value of the 30 sets of data at the 9 test points is taken as the reference temperature value of the studio, and the maximum absolute value of the difference between the 30 average values ​​of the 9 test points and the reference temperature is calculated, and the ± sign is added as the temperature uniformity.

[0064] Test results: (1) Heating time: The explosion-proof oven of Example 1 only takes 45 minutes to reach the set temperature of 150°C, which is significantly shorter than the 3-4h heating time of the prior art explosion-proof oven. Further tests show that the working room of the explosion-proof oven of Example 1 can be stabilized at a constant temperature of 30 minutes, which is 50% shorter than the time required to reach a stable temperature in the prior art, and the heat preservation time reaches more than 14 hours.

[0065] (2) Uniformity and Fluctuation: The temperature uniformity of the explosion-proof oven of Example 1 was ±2% and the fluctuation was ±0.5°C.

[0066] The explosion-proof oven used in the prior art uses an electric heater immersed in heat transfer oil, and relies on oil temperature conduction to heat the working room. In order to obtain long-term heat preservation, the designer is forced to increase the amount of heat transfer oil. For example, the explosion-proof oven with a 1300L working room in Example 1 needs to keep 420L of heat transfer oil in the oil jacket. However, the present invention uses a shell and tube heater and a heat exchanger, and only needs to pour 38L of heat transfer oil to meet the requirements, which greatly shortens the heat capacity of the liquid medium, obtains an extremely short heating time, improves thermal efficiency, and reduces energy consumption.

[0067] In summary, the explosion-proof oven not only achieves significant energy saving, but also improves the stability and safety of the oven and realizes unmanned operation.

[0068] Furthermore, the explosion-proof oven of the present invention uses two independent closed-loop cycles to achieve efficient heating of the inner tank, while avoiding possible contamination caused by direct contact of the heat transfer oil with the inner tank, thereby reducing the weight of the oven to the maximum extent.

[0069] The above is an explanation of the embodiments of the present invention. However, the present invention is not limited to the above embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An explosion-proof oven, It is characterized in that The explosion-proof oven comprises a heating system, the heating system comprises a liquid phase circulation loop and a gas phase circulation loop, the liquid phase circulation loop comprises a heater, a pump and a heat exchanger connected in sequence to form a loop, and the gas phase circulation loop comprises a heat exchanger, a fan and a jacket liner connected in sequence to form a loop; The heat exchanger comprises a liquid phase pipeline and a gas phase pipeline, wherein the liquid phase pipeline is arranged in the gas phase pipeline and is a finned tube; the inlet of the liquid phase pipeline is connected to the outlet of the pump, the outlet of the liquid phase pipeline is connected to the inlet of the heater, the inlet of the gas phase pipeline is connected to the outlet of the fan, and the outlet of the gas phase pipeline is connected to the jacket liner; The heater is a shell and tube heater having a cylindrical structure; The jacket inner liner includes an inner liner and a jacket located outside the inner liner; the jacket includes more than two layers of metal plates, the metal plates are not in direct contact with each other to form a cavity, and the cavity between the metal plates is an air duct; an air inlet and an air outlet are arranged on the jacket inner liner, the air outlet of the jacket inner liner is connected to the inlet of the fan, and the air inlet of the jacket inner liner is connected to the gas phase pipeline of the heat exchanger, and the hot air output by the heat exchanger enters the air duct; The metal plate is an aluminum plate or a carbon steel plate.

2. The explosion-proof oven according to claim 1, It is characterized in that The liquid phase circulation loop contains a liquid phase heat transfer medium, and the liquid phase heat transfer medium is oil or water.

3. The explosion-proof oven according to claim 1, It is characterized in that The metal plate is provided with fixing components and / or supporting components to form an air duct.

4. The explosion-proof oven according to claim 1, It is characterized in that At least a portion of the jacket is disposed along the outer surface of the liner; And / or, one or more through holes are provided on the wall of the inner tank close to the jacket to communicate with the air duct.

5. The explosion-proof oven according to claim 1, It is characterized in that The heating system further comprises a power support, and the heater, the fan and the pump are arranged inside the power support.

6. The explosion-proof oven according to claim 5, It is characterized in that A damper is arranged on one side of the power support; And / or, a liquid phase heat transfer medium storage tank is arranged above the heater.

7. The explosion-proof oven according to claim 1, It is characterized in that The heating system further comprises a power support, and the heater is arranged above the power support; And / or, a liquid phase heat transfer medium storage tank is arranged above the heater.

8. The explosion-proof oven according to claim 1, It is characterized in that The heating system comprises a box, and the jacket liner is arranged inside the box; A first through hole and a second through hole are arranged on the upper part of the box body, and a third through hole and a fourth through hole are arranged on the upper part of the jacket liner; the first through hole and the third through hole are connected by a first connecting pipe, and the second through hole and the fourth through hole are connected by a second connecting pipe.

9. The explosion-proof oven according to claim 8, It is characterized in that An explosion-proof membrane is arranged on the first through hole; and the second through hole is used as a test hole for arranging a sensor.

10. The explosion-proof oven according to claim 8, It is characterized in that A heat preservation layer is arranged in the interlayer of the outer wall of the box body; And / or, a box door is arranged on the box body.

11. The explosion-proof oven according to claim 10, It is characterized in that The material of the thermal insulation layer is selected from ultra-fine glass wool and / or phenolic insulation board.

12. The explosion-proof oven according to claim 8, It is characterized in that The explosion-proof oven further comprises a control system, which is arranged on the outer surface of the oven body.

13. The explosion-proof oven according to claim 12, It is characterized in that The control system includes a power supply circuit and a PLC central controller electrically connected to the power supply circuit, wherein the power supply circuit includes a load switch, a contactor and a solid-state relay; The PLC central controller is electrically connected to the heat exchanger, heater, pump and fan.

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