Roasting furnace heating device

Abstract

The utility model provides a roasting furnace heating device, which belongs to the technical field of roasting furnace equipment and comprises a furnace body in the middle of a rotary kiln roasting furnace, a combustion chamber is arranged on the surface of the furnace body and comprises a heat preservation chamber arranged at the top of the furnace body and a heating chamber arranged at the bottom of the furnace body, and the heating chamber and the heat preservation chamber are detachably mounted. First heat preservation plates are arranged at the front end and the rear end of the interior of the heat preservation cavity, a second heat preservation plate is arranged on the top wall of the interior of the heat preservation cavity, a combustion groove is formed in the bottom of the interior of the heating cavity, and a plurality of combustors are arranged on one face of the heating cavity. The top wall of the combustion chamber is subjected to heat preservation through the second heat preservation plate, so that the whole combustion chamber is subjected to the heat preservation effect, when heat energy generated by the heating chamber flows upwards, the heat dissipation speed of the heat preservation chamber can be reduced, the heat gathering effect is achieved, and heat energy consumption of the combustion chamber is reduced.

Description

Technical Field

[0001] This utility model relates to the technical field of roasting furnace equipment, specifically to a roasting furnace heating device. Background Technology

[0002] A calcining furnace, as a high-temperature processing device, is mainly used to complete a certain chemical reaction or heat treatment process under conditions below the melting temperature of the material. It is an important component of furnace charge preparation and is widely used in smelting, carbon product manufacturing, and other fields.

[0003] In related technologies, in order to ensure uniform heating inside the roasting furnace, an inclined drum-type furnace body is used, and lifting plates are installed inside the furnace body. Most roasting furnace heating devices install a combustion chamber on the outside of the furnace body, and the bottom of the furnace body is heated by a burner installed at the bottom of the combustion chamber. The material lifted by the lifting plates continuously contacts the bottom of the furnace body, thereby achieving uniform heating of the material.

[0004] However, most existing combustion chambers are welded and fixed, and the top of the combustion chamber is relatively open, which causes the heat generated at the bottom to dissipate quickly, resulting in excessive heat consumption of the combustion chamber. To solve the above problems, a roasting furnace heating device is proposed. Utility Model Content

[0005] In view of this, the present invention provides a heating device for a roasting furnace. The present invention uses a first insulation plate in the insulation chamber to insulate the front and rear ends of the combustion chamber, and a second insulation plate to insulate the top wall of the combustion chamber, so that the entire combustion chamber is insulated. When the heat generated in the heating chamber flows upward, the insulation chamber can reduce its heat dissipation rate, thereby achieving the effect of heat concentration and reducing the heat consumption of the combustion chamber.

[0006] To solve the above-mentioned technical problems, this utility model provides a heating device for a roasting furnace, including a furnace body in the middle of a rotary kiln roasting furnace, a combustion chamber provided on the surface of the furnace body, the combustion chamber including a heat preservation chamber provided at the top of the furnace body and a heating chamber provided at the bottom of the furnace body, the heating chamber and the heat preservation chamber being detachably installed, the heat preservation chamber penetrating the furnace body along the axial direction, a first heat preservation plate being provided at both the front and rear ends of the heat preservation chamber, a second heat preservation plate being provided on the top wall of the heat preservation chamber, a combustion groove being provided at the bottom of the heating chamber, and multiple burners being provided on one side of the heating chamber, the flame nozzles of the burners corresponding to the bottom of the furnace body.

[0007] The furnace body is equipped with a feed end cap to seal the feed end of the furnace body, and a discharge end cap to seal the discharge end of the furnace body.

[0008] The feed head is equipped with a feed inlet at one end, which is used to connect to the equipment that conveys materials to the furnace body. The top of the feed head is equipped with an exhaust pipe, which is used to discharge the exhaust gas in the furnace to maintain the air quality in the furnace and thus stabilize the combustion efficiency. The top of the exhaust pipe is equipped with an exhaust valve, which is used to control the opening and closing of the exhaust pipe.

[0009] One end of the discharge head is equipped with a discharge port, which is used to connect to the equipment for collecting materials in the furnace. A temperature detection device is installed at the top of the discharge head to detect the real-time temperature inside the furnace. A material sampling device is installed at the bottom of the discharge head to take out the material being roasted, thereby analyzing the current roasting state of the material.

[0010] The temperature detection device includes a temperature measuring pipe that passes through the discharge head. The temperature measuring pipe is used to transfer heat inside the furnace, so as to facilitate detection by the probe of the infrared temperature detector. The temperature measuring pipe is located inside the furnace body and is arranged along the axial direction of the furnace body. An infrared temperature detector is installed at the end of the temperature measuring pipe away from the furnace body. The infrared temperature detector is used to detect the temperature of the temperature measuring pipe, thereby measuring the real-time temperature inside the furnace.

[0011] The material sampling device includes an outer tube passing through the discharge head, which is used to wrap the inner tube and also to temporarily receive roasted materials. The inner tube is sleeved inside the outer tube and is used to finally receive roasted materials. The outer tube has a slot along the axial direction of the furnace body to facilitate the flow of materials lifted by the lifting plates in the roasting furnace. The slot extends through the upper and lower surfaces of the outer tube. The inner tube has multiple feeding ports on its surface to receive materials passing through the slots. Partitions are set between the feeding ports to separate them, thereby facilitating the simultaneous extraction of materials from different sections of the furnace during roasting. A handle is set at the end of the inner tube away from the furnace body to facilitate the rotation of the inner tube.

[0012] The bottom of the insulation chamber is equipped with a plug-in frame, which is used to connect and fix the insulation chamber to the receiving groove. The top wall of the heating chamber is equipped with a receiving groove, which is used to receive the plug-in frame, thereby connecting the insulation chamber and the heating chamber. The plug-in frame and the receiving groove are sealed together.

[0013] In summary, compared with the prior art, this application includes at least one of the following beneficial technical effects:

[0014] 1. The combustion chamber is insulated at both ends by the first insulation board in the insulation chamber and at the top wall by the second insulation board, so that the entire combustion chamber is insulated. When the heat generated in the heating chamber flows upward, the insulation chamber can reduce its heat dissipation rate, thereby achieving the effect of heat concentration and reducing the heat consumption of the combustion chamber.

[0015] 2. When it is necessary to repair the burner or heating device, the plug-in frame and the receiving groove can be separated, thereby separating the heating chamber and the insulation chamber. The heating chamber can be replaced with an electric heating device and moved to the bottom of the insulation chamber for continued use. The split design also makes it convenient and quick to repair the equipment in the heating chamber.

[0016] 3. When material needs to be removed, rotate the inner tube inside the outer tube so that the material removal port on the inner tube corresponds to the slot at the top of the outer tube. The material lifted by the lifting plate enters the material removal port through the slot on the outer tube and then enters the inner tube. The material removal port is used to receive the material passing through the slot. The material removal port is divided into sections by the partitions set inside the inner tube, which makes it convenient to remove the material from different sections of the furnace at the same time during roasting, so as to more accurately analyze the roasting state. Attached Figure Description

[0017] Figure 1 This is a cross-sectional view of the main body of this utility model;

[0018] Figure 2 This utility model Figure 1 A magnified view of part A;

[0019] Figure 3 This is a cross-sectional view of the main body of this utility model;

[0020] Figure 4 This is a side sectional view of the present invention;

[0021] Figure 5 This is a front view structural diagram of the present utility model;

[0022] Figure 6 This is a schematic diagram of the assembly structure of this utility model.

[0023] Explanation of reference numerals in the attached drawings: 100, furnace body; 101, combustion chamber; 102, insulation chamber; 103, heating chamber; 104, receiving groove; 105, first insulation board; 106, second insulation board; 107, combustion groove; 108, burner; 109, plug-in frame; 200, feed end cap; 201, discharge end cap; 202, feed interface; 203, discharge interface; 204, exhaust pipe; 205, exhaust valve; 300, temperature detection device; 301, temperature measuring pipe; 302, infrared temperature detector; 400, material sampling device; 401, outer pipe; 402, inner pipe; 403, slot; 404, material inlet; 405, partition block; 406, handle. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the following will be described in conjunction with the accompanying drawings of the embodiments of this utility model. Figure 1-6The technical solutions of the embodiments of this utility model are clearly and completely described below. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of this utility model are within the protection scope of this utility model.

[0025] like Figure 1-6 As shown: This embodiment provides a roasting furnace heating device, including a furnace body 100 in the middle of a rotary kiln roasting furnace. Roller drive devices are provided at both ends of the rotary kiln roasting furnace to drive the furnace body 100 to rotate. A combustion chamber 101 is provided on the surface of the furnace body 100, located on the outer surface of the furnace body 100. The combustion chamber 101 is used to heat the outside of the furnace body 100, thereby roasting the material inside the furnace body 100. The combustion chamber 101 includes a heat-insulating chamber 102 provided at the top of the furnace body 100, which is used to heat the material inside the furnace body 100. The heat generated in the heating chamber 103 is insulated to reduce the heat dissipation rate of the combustion chamber 101, thereby stabilizing the heating temperature of the roasting furnace. The heating chamber 103, located at the bottom of the furnace body 100, is used to install a burner 108 or other heating equipment. The heating chamber 103 heats the bottom of the furnace body 100. The heating chamber 103 and the insulation chamber 102 are detachably installed. The insulation chamber 102 extends axially through the furnace body 100. First insulation plates 105 are installed at both the front and rear ends of the insulation chamber 102. The surfaces of the heating plate 105 and the second insulation plate 106 can be coated with RLHY-1201 fire-resistant and heat-insulating coating. Both the first insulation plate 105 and the second insulation plate 106 can be made of carbon-silicon-aluminum composite board. The first insulation plate 105 is used to insulate the front and rear sides of the insulation chamber 102. The second insulation plate 106 is provided on the top wall of the insulation chamber 102. The second insulation plate 106 is used to insulate the top of the insulation chamber 102. A combustion groove 107 is provided at the bottom of the heating chamber 103. The high-temperature gas generated by combustion in the combustion groove 107 is transferred to the furnace through the combustion groove 107. The material is dried, heated, and reacted to meet the requirements of the roasting process. Multiple burners 108 are installed on one side of the heating chamber 103. The burners 108 generate high-temperature gas by burning fuel (such as coal, oil, gas, etc.) to provide a stable and controllable heat source for the rotary kiln. This is of great significance for ensuring the uniformity and stability of the material temperature in the rotary kiln and ensuring the smooth progress of the production process. The burner 108's flame pipe corresponds to the bottom of the furnace body 100. The bottom of the burner 108 is provided with a support frame that is connected and fixed to the outer wall of the heating chamber 103.

[0026] In use, the first insulation plate 105 in the insulation chamber 102 insulates the front and rear ends of the combustion chamber 101, and the second insulation plate 106 insulates the top wall of the combustion chamber 101, so that the entire combustion chamber 101 is insulated. When the heat generated by the heating chamber 103 flows upward, the insulation chamber 102 can reduce its heat dissipation rate, thereby achieving the effect of heat accumulation and reducing the heat consumption of the combustion chamber 101.

[0027] This embodiment provides a heating device for a roasting furnace.

[0028] like Figure 1 , 3 As shown in Figure 5: The feed end of the furnace body 100 is equipped with a feed head 200. The feed head 200 is connected to the feed end of the furnace body 100 by a flange seal. The feed head 200 is used to seal the feed end of the furnace body 100. The connection is sealed with high-temperature and corrosion-resistant sealing materials such as graphite gaskets and metal spiral wound films to enhance the sealing effect. A support frame can also be added to the bottom of the feed head 200 to improve its stability during operation. The discharge end of the furnace body 100... A discharge end cap 201 is provided, which is connected to the discharge end of the furnace body 100 by a flange seal. The discharge end cap 201 is used to seal the discharge end of the furnace body 100. The connection is sealed with high temperature and corrosion resistant sealing materials such as graphite gaskets and metal spiral wound film to enhance the sealing effect. A support frame can also be added to the bottom of the discharge end cap 201 to improve its stability during operation. The discharge end cap 201 is used to seal the discharge end of the furnace body 100.

[0029] The effect is as follows: the feed end cap 200 is used to seal the feed end of the furnace body 100, thereby preventing the heat from the feed end of the furnace body 100 from being lost too quickly; the discharge end cap 201 is used to seal the discharge end of the furnace body 100, thereby preventing the heat from the discharge end of the furnace body 100 from being lost too quickly.

[0030] like Figure 1 , 3 As shown in Figure 5: One end of the feed head 200 is provided with a feed interface 202, which passes through the feed head 200 and is connected to the feeding equipment. The feeding equipment can be a screw conveyor, cantilever conveyor, or other equipment. The feed interface 202 is used to connect with the equipment that supplies materials to the furnace body 100. The top of the feed head 200 is provided with an exhaust pipe 204, which is welded to the feed head 200. The exhaust pipe 204 is used to discharge waste gas from the furnace to maintain the air quality inside the furnace and thus stabilize the combustion efficiency. The top of the exhaust pipe 204 is provided with an exhaust valve 205. The exhaust valve 205 and the feed head 200 can be connected by a thread or by a flange seal. The exhaust valve 205 is used to control the opening and closing of the exhaust pipe 204.

[0031] Its functions are as follows: the feed port 202 is used to connect the equipment for conveying materials to the furnace body 100; the exhaust pipe 204 is used to discharge the waste gas in the furnace to maintain the air quality in the furnace; and the exhaust valve 205 is used to control the opening and closing of the exhaust pipe 204.

[0032] like Figure 1 , 3 As shown in Figure 5: One end of the discharge head 201 is provided with a discharge interface 203, which passes through the discharge head 201 and is connected to the material discharge equipment. The discharge interface 203 is used to connect to the equipment for collecting materials in the furnace body 100. A temperature detection device 300 is provided on the upper part of the discharge head 201. The discharge head 201 and the temperature detection device 300 are sealed together. The temperature detection device 300 is used to detect the real-time temperature inside the furnace. A material sampling device 400 is provided on the lower part of the discharge head 201. The material sampling device 400 is used to take out the material being roasted, so as to analyze the current roasting state of the material.

[0033] Its effects are as follows: the discharge port 203 is used to connect to the equipment for collecting materials in the furnace body 100, so as to facilitate the discharge of materials after roasting; the temperature detection device 300 is used to detect the real-time temperature in the furnace, so as to facilitate the operator to analyze whether the temperature of the material to be roasted meets the standard; and the material sampling device 400 is used to take out the material being roasted, so as to analyze the current roasting status of the material.

[0034] like Figure 1 , 3 As shown in Figure 4: The temperature detection device 300 includes a temperature measuring pipe 301 that passes through the discharge head 201. The temperature measuring pipe 301 is a hollow steel pipe. The temperature measuring pipe 301 is welded to the discharge head 201. The temperature measuring pipe 301 is used to transfer heat inside the furnace, so as to facilitate detection by the probe of the infrared temperature detector 302. The temperature measuring pipe 301 is located inside the furnace body 100 and is arranged along the axial direction of the furnace body 100. An infrared temperature detector 302 is installed at the end of the temperature measuring pipe 301 away from the furnace body 100. The probe of the infrared temperature detector 302 is made of high temperature resistant material. The connection between the infrared temperature detector 302 and the temperature measuring pipe 301 is sealed with a high temperature resistant and corrosion resistant material. The infrared temperature detector 302 is used to detect the temperature of the temperature measuring pipe 301, thereby measuring the real-time temperature inside the furnace.

[0035] Its effect is as follows: the temperature detection device 300 detects the real-time temperature inside the temperature measuring pipe 301 through the infrared temperature detector 302 set at the tail of the discharge end cap 201, thereby reflecting the temperature value inside the furnace body 100.

[0036] like Figure 1 , 2As shown in Figures 4 and 6: The material sampling device 400 includes an outer tube 401 that passes through the discharge head 201. The outer tube 401 is welded and fixed to the discharge head 201. A plug is provided at one end of the outer tube 401 facing the inside of the furnace body 100, and an opening is provided at the other end of the outer tube 401 facing the discharge head 201. The opening passes through the discharge head 201. The outer tube 401 is used to wrap the inner tube 402 and is also used to temporarily receive roasted materials. The inner tube 402 is sleeved inside the outer tube 401, and the inner tube 402 can be installed inside the outer tube 401. The inner tube 402 rotates to ultimately receive the roasting material. The outer tube 401 has a slot 403 along the axial direction of the furnace body 100. The length of the slot 403 is consistent with the combined length of the lifting plates inside the furnace body 100, ensuring that the lifted material can enter the slot 403 of the outer tube 401. The slot 403 facilitates the flow of material lifted by the lifting plates inside the roasting furnace. The slot 403 penetrates both the upper and lower surfaces of the outer tube 401. The surface of the inner tube 402 has multiple material outlets 404. When not picking up material, the material outlets 404 are offset from the slots 403, thereby achieving... The outer tube 401 is sealed to prevent material from entering the inner tube 402. When material needs to be removed, the inner tube 402 is rotated so that the material removal port 404 on the inner tube 402 corresponds to the slot 403 at the top of the outer tube 401. Material lifted by the lifting plate then enters the material removal port 404 through the slot 403 on the outer tube 401 and thus into the inner tube 402. The material removal port 404 is used to receive material passing through the slot 403. A partition 405 is provided between the material removal ports 404, and the partition 405 is welded and fixed to the inner wall of the inner tube 402. Block 405 is used to divide the feeding port 404, so that the feeding port 404 on the inner tube 402 is segmented, which makes it convenient to take out the material from different sections of the furnace during roasting at the same time, so as to analyze the roasting state more accurately. A handle 406 is provided at the end of the inner tube 402 away from the furnace body 100. One end of the handle 406 is welded to the inner tube 402 or fixed by thread connection, and the other end of the handle 406 is provided with a rotating handle. The rotating handle can be made of heat-insulating material. The handle 406 makes it convenient to rotate the inner tube 402.

[0037] The effect is as follows: When no material is being taken out, the material inlet 404 is offset from the slot 403, thereby sealing the outer tube 401 to prevent material from entering the inner tube 402 from the outer tube 401. When material needs to be taken out, the inner tube 402 is rotated so that the material inlet 404 on the inner tube 402 corresponds to the slot 403 at the top of the outer tube 401. Thus, the material lifted by the lifting plate enters the material inlet 404 through the slot 403 on the outer tube 401 and then enters the inner tube 402. The material inlet 404 is used to receive the material passing through the slot 403. The material inlet 404 is segmented by the partition 405 set in the inner tube 402, which facilitates the simultaneous removal of material from different segments in the furnace during roasting, thereby enabling more accurate analysis of the roasting state.

[0038] like Figure 1 , 3 As shown in Figures 4 and 5: A plug-in frame 109 is provided at the bottom of the heat-insulating chamber 102. The plug-in frame 109 is welded and fixed to the heat-insulating chamber 102. The plug-in frame 109 has a square hollow design. The hollow area inside is the same size as the bottom of the heat-insulating chamber 102. The plug-in frame 109 is used to connect and fix the heat-insulating chamber 102 to the receiving groove 104. A receiving groove 104 is provided on the top wall of the heating chamber 103. The heating chamber 103 is welded and fixed to the receiving groove 104. The groove opening 403 of the receiving groove 104 faces upward. The groove opening 403 on the receiving groove 104 fits precisely with the plug-in frame 109. The receiving groove 104 is used to receive the plug-in frame 109. The bottom of the heating chamber 103 is covered with heat-insulating material around its perimeter, thereby reducing the heat dissipation rate of the heating chamber 103, thus connecting the heat-insulating chamber 102 and the heating chamber 103. The plug-in frame 109 and the receiving groove 104 are sealed together.

[0039] Its effects are as follows: the plug-in frame 109 and the receiving groove 104 can facilitate the detachable connection between the heating chamber 103 and the insulation chamber 102, thereby facilitating the replacement of the heating source in the heating chamber 103, and also facilitating the inspection and maintenance of the heating equipment in the heating chamber 103. When it is necessary to replace the electric heating energy, the heating chamber 103 and the insulation chamber 102 can be separated, the heating chamber 103 can be taken out, and the burner 108 in the heating chamber 103 can be replaced with an electric heating plate.

[0040] Working principle: The combustion chamber 101 is insulated at both ends by the first insulation plate 105 in the insulation chamber 102, and the top wall of the combustion chamber 101 is insulated by the second insulation plate 106, thus the entire combustion chamber 101 is insulated. When the heat generated in the heating chamber 103 flows upward, the insulation chamber 102 can reduce its heat dissipation rate, thereby achieving a heat concentration effect and reducing the heat consumption of the combustion chamber 101. When the burner 108 or heating device needs to be repaired, the plug frame 109 and the receiving groove 104 can be separated, thereby separating the heating chamber 103 from the insulation chamber 102. The heating chamber 103 can then be replaced with an electric heating device and moved to the insulation chamber. The section below 102 continues to be used. The split design also allows for convenient and quick maintenance of the equipment in the heating chamber 103. When material needs to be removed, the inner tube 402 inside the outer tube 401 is rotated so that the material removal port 404 on the inner tube 402 corresponds to the slot 403 at the top of the outer tube 401. Thus, the material lifted by the lifting plate enters the material removal port 404 through the slot 403 on the outer tube 401 and then enters the inner tube 402. The material removal port 404 is used to receive the material passing through the slot 403. The material removal port 404 is segmented by the partition 405 set inside the inner tube 402, which makes it convenient to remove the material from different sections that are being roasted in the furnace at the same time, so as to more accurately analyze the roasting state.

[0041] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0042] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A heating device for a roaster, comprising a furnace body (100) in the middle of a rotary kiln roaster, characterized in that: The furnace body (100) is provided with a combustion chamber (101), which comprises a heat preservation chamber (102) arranged at the top of the furnace body (100), a heating chamber (103) arranged at the bottom of the furnace body (100), the heating chamber (103) is detachably mounted with the heat preservation chamber (102), the heat preservation chamber (102) is provided with the furnace body (100) along the axial direction, the heat preservation chamber (102) is provided with first heat preservation plates (105) at the front and rear ends, the top wall of the heat preservation chamber (102) is provided with a second heat preservation plate (106), the bottom of the heating chamber (103) is provided with a combustion groove (107), one side of the heating chamber (103) is provided with a plurality of combustion machines (108), and the flame jet pipe of the combustion machine (108) corresponds to the bottom of the furnace body (100).

2. A heating device for a roaster as claimed in claim 1, characterised in that: The feeding end of the furnace body (100) is provided with a feeding head (200), and the discharging end of the furnace body (100) is provided with a discharging head (201).

3. A furnace heating device as claimed in claim 2, characterized in that: One end of the feeding head (200) is provided with a feeding interface (202), the top of the feeding head (200) is provided with an air outlet pipe (204), and the top of the air outlet pipe (204) is provided with an air outlet valve (205).

4. A furnace heating device as claimed in claim 3, characterized in that: One end of the discharging head (201) is provided with a discharging interface (203), the upper part of the discharging head (201) is provided with a temperature detection device (300), and the lower part of the discharging head (201) is provided with a material sampling device (400).

5. A furnace heating device as claimed in claim 4, characterized in that: The temperature detection device (300) comprises a temperature measuring pipeline (301) penetrating through the discharging head (201), the temperature measuring pipeline (301) is located in the furnace body (100), the temperature measuring pipeline (301) is arranged along the axial direction of the furnace body (100), and the temperature measuring pipeline (301) is provided with an infrared temperature detector (302) away from the furnace body (100).

6. A furnace heating device as claimed in claim 5, characterized in that: The material sampling device (400) comprises an outer tube (401) penetrating through the discharging head (201), an inner tube (402) is sleeved in the outer tube (401), the outer tube (401) is provided with a notch (403) along the axial direction of the furnace body (100), the notch (403) penetrates through the upper and lower surfaces of the outer tube (401), the surface of the inner tube (402) is provided with a plurality of material taking openings (404), the material taking openings (404) are provided with a partition block (405), and the inner tube (402) is provided with a handle (406) away from the furnace body (100).

7. A furnace heating device as claimed in claim 6, characterized in that: The heat preservation chamber (102) is provided with a plug-in frame (109) at the bottom, the heating chamber (103) is provided with a receiving groove (104) at the top wall, and the plug-in frame (109) is in sealing cooperation with the receiving groove (104).

Images