A large cooking stove

Abstract

The present invention belongs to the technical field of waste heat utilization of stoves, and specifically relates to a large pot stove for cooking. The present invention includes a frame and a furnace; the furnace includes a furnace wall and a furnace bottom; an outer shell whose shape is adapted to the shape of the furnace is provided outside the furnace, and there is an insulation space between the outer shell and the furnace for accommodating insulation materials; the large pot stove for cooking also includes a heat reflection plate, the heat reflection plate includes a cone plate with a trumpet-shaped shape with a larger diameter at the top and a smaller diameter at the bottom, the small-diameter end of the cone plate constitutes a matching end for the burner to extend into, and the large-diameter end of the cone plate is placed on the inner wall of the furnace wall from top to bottom, thereby dividing the furnace into an upper cavity and a lower cavity; a smoke inlet is opened through the surface of the cone plate, and a smoke exhaust pipe connected to the smoke inlet sequentially passes through the furnace and the outer shell. The present invention can effectively improve the combustion thermal efficiency of the stove, and greatly extend the actual service life of the furnace, and simultaneously has the characteristics of energy saving, long life and easy repair and maintenance.

Description

Technical Field

[0001] The invention belongs to the technical field of stove waste heat utilization, and in particular relates to a large cooking stove. Background Art

[0002] There are a large number of large-pot stoves on the Chinese market, and they are widely used in canteens of government agencies, enterprises, institutions and schools. At present, most of the large-pot stoves on the market still use the traditional single-layer furnace structure, and such furnaces are mostly made of refractory bricks; although such refractory brick furnaces are relatively low in cost, they have the disadvantages of being easy to burst, poor heat reflection characteristics, high maintenance rate, and low or even no waste heat utilization, which need to be solved urgently. Summary of the invention

[0003] The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art and provide a large-pot stove for cooking, which can effectively improve the combustion thermal efficiency of the stove and greatly extend the actual service life of the furnace, and simultaneously have the characteristics of energy saving, long life and easy repair and maintenance.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A large pot stove for cooking, comprising a frame and a furnace arranged on the frame for heating pots; characterized in that: the furnace comprises a funnel-shaped furnace wall with a larger diameter at the top and a smaller diameter at the bottom, and a barrel-shaped furnace bottom arranged at the bottom end of the furnace wall with an inner diameter matching the diameter of the small-diameter end of the furnace wall, and the barrel bottom surface of the furnace bottom is penetrated by a matching hole for the burner to be inserted from bottom to top; an outer shell body with a shape matching the shape of the furnace is provided outside the furnace, and an insulation space for accommodating insulation material exists between the outer shell body and the furnace; the large pot stove for cooking also includes a heat reflecting plate, the heat reflecting plate comprises a trumpet-shaped cone plate with a larger diameter at the top and a smaller diameter at the bottom, the small-diameter end of the cone plate constitutes a matching end for the burner to be inserted, and the large-diameter end of the cone plate is placed on the inner wall of the furnace wall from top to bottom, thereby dividing the furnace into an upper cavity and a lower cavity; a smoke inlet is penetrated at the surface of the cone plate, and a smoke exhaust pipe connected to the smoke inlet passes through the furnace and the outer shell in sequence.

[0006] Preferably, a heat exchange winding is coaxially arranged in the heat preservation space; a heat exchange furnace ring for placing cookware is arranged around the top opening of the furnace wall, and the heat exchange furnace ring and the heat exchange winding are both connected to a water supply tank.

[0007] Preferably, the heat reflection plate also includes a plate bottom that is in the shape of a cylinder with an opening facing upward, the bottom diameter of the cone plate is smaller than the inner diameter of the plate bottom, and the top diameter is larger than the inner diameter of the plate bottom; holes for the burner head to pass through are also arranged at the plate bottom; the annular cavity formed by the plate bottom and the cone plate constitutes a flue for smoke to pass through, a smoke exhaust port is arranged at the plate bottom, and a smoke exhaust pipe connected to the flue extends outward from the smoke exhaust port and passes through the furnace.

[0008] Preferably, the large cooking stove also includes a waste heat utilization component for performing heat exchange operations on the smoke at the smoke exhaust port, the waste heat utilization component includes a water exchange water tank and an inlet pipe, a heat exchange jacket, a heat exchange coil and an exhaust gas exhaust pipe arranged in sequence along the smoke travel path; the heat exchange jacket is located in the cavity of the water exchange water tank, one end of the inlet pipe is connected to the exhaust pipe, and the other end passes through the water exchange water tank and is connected to the inlet of the heat exchange jacket; the heat exchange jacket is coaxially arranged with the heat exchange coil, and the outlet of the heat exchange jacket is connected to the inlet of the heat exchange coil; the outlet of the heat exchange coil is connected to the exhaust gas exhaust pipe.

[0009] Preferably, the heat exchange jacket is in the shape of a cup with an opening facing upward, and a through hole with a diameter smaller than the diameter of the cup mouth of the heat exchange jacket is penetrated at the bottom of the cup of the heat exchange jacket, so that the top cup mouth and the through hole at the bottom of the heat exchange jacket are combined to form a through-shaped guide cavity for the circulation of water in the heat exchange water tank.

[0010] Preferably, the outer wall of the heat exchange water tank is in the shape of a two-stage stepped shaft that is thick at the top and thin at the bottom. The heat exchange coil is coaxially coiled in the tank cavity where the large diameter section of the heat exchange water tank is located. A water-wrapped tube that is connected to its own tank cavity radially extends from the small diameter section of the heat exchange water tank. The inlet pipe is coaxially arranged in the water-wrapped tube. A cigarette box is arranged on the top outer wall of the heat exchange jacket, and the box cavity of the cigarette box is connected to the sleeve cavity of the heat exchange jacket. The cigarette box constitutes the outlet of the heat exchange jacket.

[0011] Preferably, the waste heat utilization component also includes a steam exhaust pipe connected to the top outlet of the water exchange water tank; the exhaust gas exhaust pipe first coaxially extends vertically upward through the tube cavity of the steam exhaust pipe, then horizontally penetrates the tube wall of the steam exhaust pipe and penetrates into the tank cavity of the water replenishment tank located next to it, and then passes through the water replenishment tank to form a waste outlet, and the water replenishment tank and the water bag pipe are connected to each other through the water replenishment pipeline.

[0012] Preferably, a steam box is arranged above the heat exchange water tank, and the bottom surface of the steam box and the top surface of the heat exchange water tank are connected to each other through a return pipe and the steam exhaust pipe. The steam exhaust pipe is used to draw steam out of the heat exchange water tank and introduce it into the steam box, and then discharge it to external equipment through the steam outlet of the steam box. The return pipe is used to return condensed water in the steam box to the heat exchange water tank.

[0013] Preferably, a water vapor separation baffle is provided on the connecting hole in the steam box through which the top end of the steam exhaust pipe can pass; the water vapor separation baffle is fixed on one side of the connecting hole, and the water vapor separation baffle first extends vertically upward and then extends horizontally to directly above the connecting hole; the steam outlet is located above or behind the water vapor separation baffle; in the vertical direction, the connecting hole is located within the projection range of the water vapor separation baffle.

[0014] Preferably, the waste heat utilization component also includes an explosion-proof pipe that passes through the heat exchange water tank from bottom to top and is connected to the heat exchange sleeve cavity, and an explosion-proof valve is arranged at the explosion-proof pipe; the explosion-proof valve includes a horizontal rotating shaft arranged at a side wall of the explosion-proof pipe orifice, and a port sealing plate is hinged on the horizontal rotating shaft; one end of the explosion-proof pipe orifice that is closed from bottom to top by the port sealing plate under the hinged action of the horizontal rotating shaft is the closed end, and the other end is the counterweight end, and a counterweight block is arranged at the counterweight end of the port sealing plate.

[0015] The beneficial effects of the present invention are:

[0016] 1) Through the above scheme, on the one hand, the design of the heat preservation space effectively reduces the surface temperature of the stove, and while obtaining a higher waste heat utilization efficiency, reduces the heat emission of the stove, effectively prolongs the service life of the stove equipment, and can also prevent the chef from being scalded by high temperature. Compared with the traditional stove, in order to cool down the stove when the stove is running, it takes a long time to pass tap water to flood the stove table to achieve the purpose of cooling the stove equipment, generally 0.3 tons to 0.5 tons of tap water are consumed per hour. The above design of the present invention can also avoid wasting a large amount of tap water, which also makes the present invention have the characteristics of energy saving and emission reduction. On the other hand, the heat reflection plate relies on gravity to overlap from top to bottom, so as to isolate the furnace wall to form an upper and lower chamber structure; when working, the heat energy is concentrated in the upper chamber, and the smoke is then guided out through the smoke inlet, which not only further improves the combustion thermal efficiency of the stove through the heat reflection of the heat reflection plate, but also realizes its easy maintenance function through the natural overlap assembly of the heat reflection plate, achieving multiple goals at one stroke.

[0017] 2) In actual design, the heat exchange furnace ring is arranged at the top mouth of the entire furnace, which can play the function of cooperating with the cooker to close the furnace; the heat exchange winding is buried in the insulation material, thereby realizing the further collection and utilization of thermal energy.

[0018] 3) In actual design, the bottom of the plate and the cone plate cooperate to form a combined heat reflector plate, which not only ensures the formation of the flue and realizes the surrounding heating effect of the high-heat flue gas, but also reduces the manufacturing cost and effectively improves its cost performance. In addition, the cone plate itself can be regarded as both a part of the cylinder cavity of the heat reflector plate and the top surface of the heat reflector plate. In this way, when the cone plate extends outward along its own cone surface and passes over the barrel mouth of the bottom of the plate, the cone plate can naturally rest on the furnace wall, thereby ensuring the maximization of thermal efficiency while achieving a simple assembly effect.

[0019] 4) The purpose of designing the waste heat utilization component is naturally to maximize the utilization of waste heat. In other words, theoretically, the lower the heat of the flue gas discharged from the exhaust pipe to the external environment, the better. At this time, the heat absorption design of the cooking stove is crucial. Its heat absorption design is also the fundamental reason why the heat exchange effects produced by different heat exchange components vary greatly.

[0020] The present invention abandons the traditional simple and inefficient "water-in-air" or "air-in-water" heat exchange structure, and instead adopts the layout of the inlet pipe, heat exchange sleeve, heat exchange coil and exhaust gas exhaust pipe along the line to form the flue gas travel path, and on the travel path, the heat exchange water tank and the heat exchange coil are arranged in sequence from near to far, so as to utilize the multi-stage "water-in-air" method with higher heat exchange efficiency, while meeting the normal heating needs of the stove, maximize the purpose of high-efficiency utilization of the waste heat in the stove, and finally make the water between the heat exchange sleeve and the heat exchange water tank be heated to form hot water. After absorbing heat through the above-mentioned "water-in-air" method, the temperature at the outlet of the exhaust gas exhaust pipe is sufficient to meet the actual discharge requirements. Through the above-mentioned structure, the high-temperature waste heat of the flue gas discharged through the furnace will be largely absorbed by the water in the hot water tank and produce hot water or steam, and the produced hot water or steam will then be led out through the water supply and drainage pipe or the steam outlet, which obviously effectively improves the waste heat utilization efficiency of the existing stove.

[0021] 5) The heat exchange jacket can be a conventional hollow tube structure, or a "water-in-air" structure such as a heat sink or a coil. During actual operation, the water fills the heat exchange water tank. The present invention preferably adopts a cup-shaped structure with a hole at the bottom, so that when the high-temperature flue gas passes through the heat exchange jacket, it will drive the water in the heat exchange water tank to produce a sharp temperature change. Under the constraint of the heat exchange jacket, the heated hot water can surround the outer wall of the heat exchange jacket to produce a circulation effect, which can greatly improve the efficiency of water heating. In addition, the aperture of the through hole should be smaller than the cup mouth of the heat exchange jacket, so that when the water passes through the through hole from bottom to top, a flow limiting phenomenon will occur, which makes the cup cavity of the heat exchange jacket form a water boiling structure similar to a pot to a certain extent, with a larger contact area, and presents a surrounding and enveloping heating effect of the high-temperature flue gas on the water in the cup structure, thereby further improving the heat exchange efficiency. At the same time, the water with a lower temperature flowing through the through hole from bottom to top will automatically replenish water in the cup structure.

[0022] 6) A water-enclosed pipe is also extended from the hot water tank, so that when the flue gas is just led out from the furnace wall, it is further covered by the "water-enclosed air" structure of the water-enclosed pipe and heat exchange is carried out. On the other hand, even if the water in the hot water tank has boiled, the flue gas is cooled down by the heat exchange jacket and the heat exchange coil in sequence, and is still absorbed by the steam-water mixture gushing upward from the exhaust gas discharge pipe in the vertical section. After the flue gas enters the heat exchange structure in the water supply tank from the vertical section of the exhaust gas discharge pipe, it is again absorbed by the cold water in the water supply tank, and finally a low-temperature exhaust effect is achieved. As for the water supply tank, its own function is to replenish water into the aforementioned box body. After preliminary heating through the exhaust gas discharge pipe, the water supply tank can directly provide hot water.

[0023] In addition, it should be noted that the water outlet path at the water supply tank is to first enter the water bag pipe, and then enter the corresponding water exchange tank or even the steam exhaust pipe in sequence. That is, the water supply path of the water supply tank just constitutes the flue gas cooling path from hot to cold, and at the same time ensures that the hottest flue gas is just matched with the water with the lowest relative temperature, thereby ensuring the maximization of heat exchange in the flue gas, and the effect is extremely significant.

[0024] 7) When the heat exchange water tank is used alone, the present invention has the function of heating water by utilizing waste heat, so that corresponding hot water can be supplied. When a steam discharge pipe and a steam tank are added, the present invention can also realize an additional steam collection function. When the steam tank is used, it is ensured that the steam can be discharged to the external equipment along the steam outlet, and the steam-water separation can be ensured through the return pipe and the water vapor separation baffle, and the separated hot water flows back to the heat exchange water tank through the return pipe.

[0025] 8) The explosion-proof valve can form a "seesaw"-like balanced torque system at the mouth of the explosion-proof pipe. When the stove is not in use and is burning normally, the resistance torque formed by the counterweight end of the port seal will keep the port seal closed; however, when the furnace wall explodes, the suddenly increased flue gas pressure will be transmitted to the heat exchange water tank and push open the port seal, thereby instantly releasing the high pressure through the "green channel" to play a safety protection function. After the pressure relief is completed, the port seal is closed, thereby playing an explosion-proof role. Another purpose of this design is sewage discharge: when the flue gas temperature in the heat exchange sleeve is lower than its dew point temperature, condensation will occur. Since there are still a small amount of acidic substances in the flue gas, such as: NO x , CO2, etc., so the condensed water is weakly acidic. The design of the present invention facilitates the acidic condensed water to slide to the port sealing plate due to gravity. A small amount of water will leak out from the gap between the port and the sealing plate. When there is a lot of condensed water, it will accumulate in the vertical pipe at the upper end of the port. When it reaches a sufficient height, the torque generated by its pressure will be sufficient to overcome the resistance torque of the torque system and push the sealing plate open, thereby achieving the purpose of sewage discharge. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the structure of the present invention after the waste heat utilization component is removed;

[0027] Figure 2 It is a structural assembly diagram of the present invention;

[0028] Figure 3 and Figure 4 It is a structural schematic diagram of the waste heat utilization component of the hot water type embodiment;

[0029] Figure 5 and Figure 6 It is a schematic structural diagram of the waste heat utilization component of the steam type embodiment.

[0030] The actual correspondence between the reference numerals and component names of the present invention is as follows:

[0031] 10-Heat reflective disk

[0032] 11- cone plate 11a- smoke inlet 12- bottom plate 12a- smoke outlet 13- smoke exhaust pipe

[0033] 20-frame 21-outer shell 31-furnace wall 32-furnace bottom

[0034] 40-heat exchange winding 50-heat exchange furnace ring

[0035] 61-water supply tank 62a-inlet pipe 62b-heat exchange jacket 62c-heat exchange coil

[0036] 62d-waste exhaust pipe 62e-waste outlet 62f-cigarette box 62g-through hole

[0037] 63-heating water tank 63a-water pipe

[0038] 64-steam exhaust pipe 65-steam box 65a-water vapor separation baffle 65b-steam outlet

[0039] 66-Return pipe 67-Supplementary water pipe

[0040] 68-explosion-proof valve 68a-horizontal rotation axis 68b-port sealing plate 68c-counterweight DETAILED DESCRIPTION

[0041] For ease of understanding, here we combine Figure 1-6 The specific structure and working mode of the present invention are further described as follows:

[0042] The waste heat utilization assembly of the present invention has the following types depending on the difference of the on-site application objects: Figure 1-4 The hot water type heat exchanger shown and Figure 5-6 There are two specific implementation categories of steam-type heat exchangers shown. As the name implies, the hot water-type heat exchanger is used to realize the design function of converting waste heat into hot water, while the steam-type heat exchanger further realizes the design purpose of converting waste heat into steam. For the steam-type heat exchanger, compared with the hot water-type heat exchanger, more steam discharge pipes 64, return pipes 66 and even water vapor separation baffles 65a are added, so the structure is relatively more complicated.

[0043] The following combination Figure 1-4 The specific embodiment of the present invention is described as follows using a hot water heat exchanger:

[0044] The specific embodiment structure of the present invention refers to Figure 5-6As shown, its main structure is composed of a heat exchange furnace ring 50, a heat reflection plate 10, a furnace, an outer shell 21, a heat exchange winding 40 and corresponding waste heat utilization components. Figure 1-2 As shown, they are all made of high-temperature resistant metal materials and are in an inverted cone shape; a matching gap is formed by the cooperation of the two, and the matching gap forms an insulation space that can be filled with heat exchange windings 40 and insulation materials. The furnace can be regarded as being formed by the furnace wall 31 constituting the upper furnace and the furnace bottom 32 constituting the lower furnace. The upper furnace and the lower furnace are separated by a concave structure cone-shaped high-temperature resistant heat reflection plate 10, the upper edge of which overlaps the inner wall of the upper furnace to minimize the high-temperature flue gas from directly penetrating into the lower furnace through the overlapping gap; the lower part is connected to the outer wall of the furnace head. The concave surface of the cone plate 11 at the heat reflector 10 is provided with a plurality of through holes for passing hot flue gas, thereby forming a smoke inlet 11a; the lower furnace is surrounded by a barrel-shaped furnace bottom 32, the upper edge of the furnace bottom 32 extends upward and connects with the lower edge of the conical inner wall of the upper furnace, and the burner passes through from top to bottom and is fixed to the furnace bottom 32 by threads or bolts. In addition, the upper furnace, that is, the furnace wall 31, can be tilted at the six o'clock position to provide a hole for installing a fire-watching tube.

[0045] Obviously, the present invention has the characteristics of ingenious structure, easy manufacturing, effective improvement of thermal efficiency of large stoves, high waste heat utilization efficiency, low heat loss and easy repair and maintenance. The component in the furnace that bears high temperature is the heat reflection plate 10, which is made of high temperature resistant and corrosion resistant metal material, and is easy to disassemble and assemble, and is extremely convenient to use and maintain.

[0046] Furthermore, the heat reflective plate 10 can be further provided with a plate bottom 12, that is, it is finally formed by the cooperation of the cone plate 11 and the plate bottom 12. More specifically, during operation, the heat reflective plate 10 and the burner head, the heat exchange furnace ring 50, and the cookware form a relatively closed combustion zone cavity, and the cone plate 11 is also provided with a plurality of smoke inlets 11a for passing hot smoke. The upper edge of the heat reflective plate 10 and the furnace wall 31 naturally rely on gravity to rest; or the positional relationship relative to the furnace wall 31 is maintained by the supporting force applied by the plate bottom 12. A large smoke exhaust port 12a is provided on the bottom surface of the plate bottom 12 of the heat reflective plate 10 to extend outward to form a smoke exhaust pipe 13, which is used to guide the high-temperature smoke into the corresponding structure at the rear of the stove.

[0047] It can be seen that the above-mentioned furnace design can ensure that when the pot is placed flat on the heat exchange furnace ring 50, the flame generated by the combustion at the burner head will spray upward along the center of the pot bottom, so as to achieve the effect of no bias and uniform firepower; this design can effectively reduce the space of the cavity in the high-temperature combustion zone of the furnace, reduce heat loss, and at the same time, after the concave reflection surface, that is, the cone plate 11, is burned red, it can better reflect the heat to the lower part of the pot in the form of infrared rays. When the hot flue gas enters the annular flue in the heat reflection plate 10 from the cavity in the high-temperature combustion zone through the smoke inlet 11a opened on the cone plate 11, it will heat the bottom 12 and the cone plate 11, and the heat in the furnace will transfer the heat to the heat exchange winding 40 wrapped in the insulation material by thermal radiation. The design of the insulation space effectively reduces the surface temperature of the stove, and while obtaining a higher waste heat utilization efficiency, it reduces the heat emission of the stove, effectively prolongs the service life of the stove equipment, and can also prevent the chef from being scalded by high temperature. Compared with the traditional stove, in order to cool down the stove, tap water needs to be poured over the stove surface for a long time to cool down the stove equipment, which generally consumes 0.3 tons to 0.5 tons of tap water per hour, the above design of the present invention can avoid wasting a lot of tap water. The independent heat reflection plate 10 can also effectively avoid the disadvantage of being difficult to repair after the furnace is burned, and the replacement of the heat reflection plate 10 is also more convenient.

[0048] Furthermore, for a hot water type heat exchanger, it is composed of a heat exchange assembly and a water supply tank 61; of course, in the case where the cooling water of the heat exchanger is pumped in by an external water pump, the water supply tank 61 may not be specially designed. The heat exchange assembly includes an internal smoke chamber and an external water chamber made of corrosion-resistant and high-temperature resistant metal materials. The internal smoke chamber includes an inlet pipe 62a, a heat exchange jacket 62b, a heat exchange coil 62c and an exhaust gas exhaust pipe 62d; Figure 3-4 As shown, the inlet pipe 62a is connected to the exhaust pipe 13 at the heat reflector plate 10 to receive high-temperature smoke. In order to increase the heat exchange surface area, the heat exchange sleeve 62b can form a long cylindrical water cup structure extending downward. The bottom of the cylindrical water cup structure is at the bottom, close to the bottom of the heat exchange water tank 63, and the upper edge of the cup mouth is fixedly connected to the top plate of the heat exchange water tank 63 through a fixing member. The water in the cup is connected to the water in the external water cavity, and a through hole 62g is arranged through the bottom of the cup; the external water cavity includes a water bag pipe 63a and a heat exchange water tank 63.

[0049] When working, Figure 3-6As shown, the high-temperature flue gas is input from the exhaust port 12a of the furnace to the heat exchange jacket 62b through the inlet pipe 62a. The heat carried by the high-temperature flue gas is first heat-exchanged with the water in the water-wrapped tube 63a. The hot flue gas that has been initially cooled enters the lower part of the heat exchange water tank 63. When it flows through the gap formed by the heat exchange water tank 63 and the cylindrical water cup-shaped heat exchange jacket 62b, it heat-exchanges with the water outside the heat exchange water tank 63 and inside the heat exchange jacket 62b. The hot flue gas that has been further cooled then enters the heat exchange coil 62c. The heat exchange coil 62c is a high-temperature and corrosion-resistant metal coil with a multi-turn spiral structure. Its inlet is installed on a small smoke collecting boss protruding outward in the middle of the heat exchange water tank 63, and its outlet is installed on the side wall of the smoke collecting box 62f located above the heat exchange water tank 63. The smoke collecting box 62f is a flat cavity structure, and the water replenishment level of the entire heat exchange water tank 63 is slightly higher than the smoke collecting box 62f. The first vertical pipe section of the exhaust gas exhaust pipe 62d is installed on the upper part of the smoke collecting box 62f, and the exhaust gas exhaust pipe 62d passes through the top plate of the water exchange tank 63 and enters the steam exhaust pipe 64. The low-temperature flue gas flows from the smoke collecting box 62f into the steam exhaust pipe 64, and flows laterally at a certain height into the horizontal pipe section of the exhaust gas exhaust pipe 62d installed in the water supply tank 61. The water inlet of the water supply tank 61 is connected to the tap water, and the water outlet is connected to the water bag pipe 63a through the water supply pipeline 67.

[0050] The water supply tank 61 is composed of a liquid level gauge for controlling the water level and water inlet, and the second vertical pipe section of the exhaust gas discharge pipe 62d in the water supply tank 61. The metal float at the liquid level gauge is used to control the final water level of the equipment. The structure of the exhaust gas discharge pipe 62d located in the water supply tank 61 is a thin-walled metal pipe or thin-walled metal pipe bundle that is resistant to high temperature and corrosion. After the flue gas enters the exhaust gas discharge pipe 62d in the water supply tank 61, it further exchanges heat with the low-temperature tap water in the water supply tank 61, and is finally discharged into the atmosphere from the exhaust outlet 62e.

[0051] In addition, the present invention also has the following Figure 3-6The explosion-proof pipe or sewage outlet with an explosion-proof valve is shown. The specific principle is: a high-temperature and corrosion-resistant metal pipe penetrates the bottom surface of the heat exchange water tank 63 and the bottom surface of the heat exchange sleeve 62b, and extends to the external atmosphere. A horizontal rotating shaft 68a, a port sealing plate 68b, and a counterweight 68c are fixedly installed on one side of the port. Through the horizontal rotating shaft 68a, the counterweight 68c and the port sealing plate 68b can be combined to form a "seesaw" type balanced torque system. When the stove is not in use and is burning normally, the resistance torque formed by the counterweight end of the port sealing plate 68b will keep the port sealing plate 68b closed; however, when a deflagration occurs in the furnace, the suddenly increased flue gas pressure will be transmitted to the heat exchange water tank 63 and push open the port sealing plate 68b, thereby achieving a pressure relief effect. After the pressure relief is completed, the port sealing plate 68b is closed, thereby playing an explosion-proof role. Another purpose of this design is to discharge waste: when the flue gas temperature in the heat exchange jacket 62b is lower than its dew point temperature, condensation will occur. Since there are still a small amount of acidic substances in the flue gas, such as NO x , CO2, etc., so the condensed water is weakly acidic. The design of the present invention facilitates the acidic condensed water to slide to the port sealing plate 68b due to gravity. A small amount of water will leak out from the gap between the port and the sealing plate 68b. When there is a lot of condensed water, it will accumulate in the vertical pipe at the upper end of the port. When it reaches a sufficient height, the torque generated by its pressure will be sufficient to overcome the resistance torque of the torque system and push the sealing plate 68b open, thereby achieving the function of sewage discharge.

[0052] As a steam type heat exchanger with a more complex structure, it is composed of a heat exchange assembly, a steam box 65 and a water supply tank 61. The heat exchange assembly includes an internal smoke chamber and an external water chamber made of corrosion-resistant and high-temperature resistant metal materials. Similarly, the internal smoke chamber includes an inlet pipe 62a, a heat exchange jacket 62b, a heat exchange coil 62c and an exhaust gas exhaust pipe 62d; Figure 5-6 As shown, the inlet pipe 62a is connected to the smoke exhaust pipe 13 at the heat reflector plate to receive the high-temperature smoke. Similarly, in order to increase the heat exchange surface area, the heat exchange sleeve 62b can form a long cylindrical water cup structure extending downward; the bottom of the cylindrical water cup structure is at the bottom, close to the bottom of the heat exchange water tank 63, the upper edge of the cup mouth is fixedly connected to the top plate of the heat exchange water tank 63 through a fixing member, the water in the cup is connected to the water in the external water cavity, and a through hole 62g is arranged through the bottom of the cup. The external water cavity includes a water bag pipe 63a, a heat exchange water tank 63, and a steam exhaust pipe 64. When a steam-type heat exchanger is used, the upper end of the steam exhaust pipe 64 needs to be connected to the steam box 65, and the steam box 65 includes a water vapor separation baffle 65a, a return pipe 66, and a steam outlet 65b. The steam-water mixture generated in the external water cavity gushes upward into the steam box 65 through the gap between the steam discharge pipe 64 and the exhaust gas discharge pipe 62d, and the sprayed steam-water mixture is blocked by the water vapor separation baffle 65a. Figure 5-6As shown, the water vapor separation baffle 65a is arranged in an inverted "L" shape, and the baffle of the upper transverse section is located directly above the steam discharge pipe 64, and the projected size is larger than the diameter of the steam discharge pipe 64. After the steam-water mixture hits the water vapor separation baffle 65a, the kinetic energy of the water is reduced and the water rebounds and falls down and converges to the return water pipe 66 installed on the steam box 65 away from the steam outlet 65b. Figure 6 It can be seen that the return pipe 66 is connected to the lower part of the steam box 65 at the top and to the heat exchange water box 63 at the bottom. The top of the steam box 65 is provided with a steam outlet 65b, a pressure relief valve and a pressure gauge.

[0053] Of course, it will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0054] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0055] The techniques, shapes, and structural parts not described in detail in the present invention are all well-known techniques.

Claims

1. A large cooking stove, comprising a frame (20) and a furnace arranged on the frame (20) for heating a pot; characterized in that: The furnace comprises a furnace wall (31) in the shape of a funnel with a larger diameter at the top and a smaller diameter at the bottom, and a cylindrical furnace bottom (32) arranged at the bottom end of the furnace wall (31) and having an inner diameter matching the diameter of the small diameter end of the furnace wall (31). The bottom surface of the furnace bottom (32) is penetrated by a matching hole for the burner to be inserted from bottom to top. The furnace is covered with an outer shell (21) having an outer shape matching the furnace, and an insulation space for accommodating insulation materials exists between the outer shell (21) and the furnace. The large cooking stove also comprises The heat reflection plate (10) comprises a cone plate (11) in the shape of a trumpet with a larger diameter at the top and a smaller diameter at the bottom, the small diameter end of the cone plate (11) forming a mating end for the furnace head to extend into, and the large diameter end of the cone plate (11) rests on the inner wall of the furnace wall (31) from top to bottom, thereby dividing the furnace into an upper cavity and a lower cavity; a smoke inlet (11a) is provided through the surface of the cone plate (11), and a smoke exhaust pipe (13) connected to the smoke inlet (11a) passes through the furnace and the outer shell (21) in sequence; A heat exchange winding (40) is coaxially arranged in the heat preservation space; The heat reflection plate (10) further comprises a plate bottom (12) in the shape of a cylinder with an opening facing upwards; the bottom diameter of the cone plate (11) is smaller than the inner diameter of the plate bottom (12) and the top diameter is larger than the inner diameter of the plate bottom (12); a hole for the furnace head to pass through is also arranged at the plate bottom (12); the annular cavity formed by the plate bottom (12) and the cone plate (11) constitutes a flue for the flue gas to pass through; a smoke exhaust port (12a) is arranged at the plate bottom (12); a smoke exhaust pipe (13) connected to the flue extends outward from the smoke exhaust port (12a) and penetrates the furnace.

2. A large cooking stove according to claim 1, characterized in that: A heat exchange furnace ring (50) for placing pots is arranged around the top opening of the furnace wall (31), and the heat exchange furnace ring (50) and the heat exchange winding (40) are both connected to a water supply tank (61).

3. A large cooking stove according to claim 1 or 2, characterized in that: The large cooking stove also includes a waste heat utilization component for performing heat exchange operations on the smoke at the smoke exhaust port (12a), the waste heat utilization component including a heat exchange water tank (63) and an inlet pipe (62a), a heat exchange sleeve (62b), a heat exchange coil (62c) and an exhaust gas exhaust pipe (62d) arranged in sequence along the smoke travel path; the heat exchange sleeve (62b) is located in the cavity of the heat exchange water tank (63), one end of the inlet pipe (62a) is connected to the smoke exhaust pipe (13), and the other end passes through the heat exchange water tank (63) and is connected to the inlet of the heat exchange sleeve (62b); the heat exchange sleeve (62b) and the heat exchange coil (62c) are coaxially arranged, and the outlet of the heat exchange sleeve (62b) is connected to the inlet of the heat exchange coil (62c); the outlet of the heat exchange coil (62c) is connected to the exhaust gas exhaust pipe (62d).

4. A large cooking stove according to claim 3, characterized in that: The heat exchange jacket (62b) is in the shape of a cup with an opening facing upward, and a through hole (62g) having a smaller diameter than the cup mouth of the heat exchange jacket (62b) is provided at the bottom of the cup of the heat exchange jacket (62b), so that the top cup mouth of the heat exchange jacket (62b) and the through hole (62g) at the bottom are combined to form a through-shaped guide cavity through which water in the heat exchange water tank (63) can circulate.

5. A large cooking stove according to claim 4, characterized in that: The outer wall of the heat exchange water tank (63) is in the shape of a two-stage stepped shaft that is thick at the top and thin at the bottom. The heat exchange coil (62c) is coaxially coiled in the tank cavity where the large diameter section of the heat exchange water tank (63) is located. A water pipe (63a) that is connected to the tank cavity of the heat exchange water tank (63) extends radially from the small diameter section of the heat exchange water tank (63). The inlet pipe (62a) is coaxially arranged in the water pipe (63a). A smoke collecting box (62f) is arranged at the top outer wall of the heat exchange jacket (62b). The box cavity of the smoke collecting box (62f) is connected to the jacket cavity of the heat exchange jacket (62b). The smoke collecting box (62f) constitutes the outlet of the heat exchange jacket (62b).

6. A large cooking stove according to claim 5, characterized in that: The waste heat utilization component also includes a steam exhaust pipe (64) connected to the top outlet of the heat exchange water tank (63); the waste gas exhaust pipe (62d) first coaxially extends vertically upward through the tube cavity of the steam exhaust pipe (64), then horizontally penetrates the tube wall of the steam exhaust pipe (64) and penetrates into the box cavity of the water replenishment tank (61) located on the side, and then passes out of the water replenishment tank (61) to form a waste outlet (62e); the water replenishment tank (61) and the water bag pipe (63a) are connected to each other through the water replenishment pipeline (67).

7. A large cooking stove according to claim 6, characterized in that: A steam box (65) is arranged above the heat exchange water tank (63). The bottom surface of the steam box (65) and the top surface of the heat exchange water tank (63) are connected to each other through a return pipe (66) and the steam exhaust pipe (64). The steam exhaust pipe (64) is used to draw steam from the heat exchange water tank (63) and introduce it into the steam box (65), and then discharge it to external equipment through the steam outlet of the steam box (65). The return pipe (66) is used to return condensed water in the steam box (65) to the heat exchange water tank (63).

8. The large cooking stove according to claim 7, characterized in that: A water vapor separation baffle (65a) is provided on the connecting hole in the steam box (65) through which the top end of the steam exhaust pipe (64) can pass; the water vapor separation baffle (65a) is fixed on one side of the connecting hole, and the water vapor separation baffle (65a) first extends vertically upward and then extends horizontally to the top of the connecting hole; the steam outlet (65b) is located above or behind the water vapor separation baffle (65a); in the vertical direction, the connecting hole is located within the projection range of the water vapor separation baffle (65a).

9. The large cooking stove according to claim 3, characterized in that: The waste heat utilization component also includes an explosion-proof pipe that passes through the heat exchange water tank (63) from bottom to top and then connects to the sleeve cavity of the heat exchange sleeve (62b), and an explosion-proof valve (68) is arranged at the explosion-proof pipe; the explosion-proof valve (68) includes a horizontal rotation axis (68a) arranged at a side wall of the pipe mouth of the explosion-proof pipe, and a port sealing plate (68b) is hinged on the horizontal rotation axis (68a); one end of the port sealing plate (68b) that closes the pipe mouth of the explosion-proof pipe from bottom to top under the hinged action of the horizontal rotation axis is the closed end, and the other end is the counterweight end, and a counterweight block (68c) is arranged at the counterweight end of the port sealing plate (68b).

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