Bio-fuel heating type special frying pot for spicy potato shred

Abstract

The application discloses a kind of biological fuel heating formula special frying pan of hot and spicy potato shred, it is related to food frying processing equipment technical field.The present application aims at solving the technical problems that existing hot and spicy potato shred processing equipment open fire heating is easy to contaminate oil product food material, electric heating energy consumption cost is high, oil temperature is uneven, residue cleaning is complicated, cannot adapt to biological fuel stable heating.The device includes the kettle body with funnel-shaped cavity, support, heat preservation plate, the first heating pipe is arranged in the kettle body, two groups of matrix type second heating pipe and exhaust pipe are communicated, the kettle body is formed with three-stage communication cavity and inclined guide surface, the communication cavity is equipped with sealed closed assembly, pipeline adopts gradually decreasing flow area structure.The present application relies on biological fuel indirect heat exchange to realize heat source and oil product complete isolation, power boosting exhaust, heat exchange is uniform, and heat loss is low.

Description

Technical Field

[0001] This invention belongs to the field of frying equipment technology, and specifically relates to a special fryer for spicy shredded potatoes heated by biofuel. Background Technology

[0002] In the field of spicy shredded potatoes processing, the frying equipment used in the industry is mostly general-purpose fryers, which mainly rely on traditional fuel open flame heating or electric heating to complete the frying process.

[0003] Traditional open-flame heating systems using coal or firewood generate waste residue, dust, and fumes during combustion. The fumes directly contact the frying oil, easily causing impurities to mix into the oil and adhere to the surface of the potato shreds. This not only accelerates oil oxidation and deterioration, shortening the oil's shelf life, but also affects the color, texture, and flavor consistency of the spicy potato shreds. Furthermore, the combustion residue requires frequent shutdowns for cleaning, resulting in poor production continuity, and the smoke and dust pollute the production environment, failing to meet food hygiene standards. While electric heating frying equipment avoids smoke and waste pollution, offering a higher level of cleanliness, its high heating power and continuous energy consumption make it uneconomical for large-scale, batch production of spicy potato shreds, as electricity costs remain consistently high. This makes it difficult to meet the demands of low-cost, large-scale production.

[0004] Solid biomass fuels offer advantages such as complete combustion, low residue, low smoke production, and low heating costs, overcoming the shortcomings of the two heating methods mentioned above. However, currently, there is no dedicated frying equipment for spicy shredded potatoes that is compatible with solid biomass fuel heating. Traditional general-purpose fryers cannot match the heating characteristics of solid biomass fuels and generally lack a heat-conducting heating structure that isolates the heat source from the frying oil, resulting in oil smoke and impurities on the heat source side potentially contaminating the oil and affecting product quality. Therefore, there is a need for a frying equipment that can precisely adapt to the frying process of spicy shredded potatoes, employs an isolated heat-conducting structure, and uses solid biomass fuel for heating. Summary of the Invention

[0005] The present invention aims to provide a special deep fryer for spicy shredded potatoes heated by biofuel, mainly to fill the technological gap in the existing spicy shredded potato frying equipment that lacks an isolated heat-conducting structure suitable for solid biofuel.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: A biofuel-heated deep fryer for spicy shredded potatoes includes a pot body, which comprises a pot shell and heating tubes; the pot shell is rectangular in shape, and the heating tubes are multiple and inserted inside the pot body.

[0007] Preferably, it also includes an exhaust pipe, and the heating pipe includes a first heating pipe and a second heating pipe, the first heating pipe is connected to the second heating pipe, the exhaust pipe is connected to the second heating pipe, the two ends of the first heating pipe pass through and connect to both sides of the pot body, and the first heating pipe is connected to the biofuel chamber; the high-temperature hot gas generated by the combustion of biofuel is introduced into the first heating pipe, the two ends of the second heating pipe pass through and connect to both sides of the pot body, the hot gas is introduced into the second heating pipe through the first heating pipe, and the cooking oil in the pot is heated by heat conduction through the pipe wall to achieve heat source isolation from oil, and to prevent oil fumes and impurities from mixing into the oil. The high-temperature hot gas generated by the combustion of biofuel in the biofuel chamber flows through the first heating pipe and the second heating pipe in sequence, and heats the oil in the pot by heat conduction through the pipe wall; the low-temperature exhaust gas after heat exchange is finally discharged to the outside through the square exhaust port of the exhaust pipe to achieve centralized emission of flue gas.

[0008] Preferably, there are multiple second heating tubes, which are divided into two groups. The pot body is recessed inward between the hot air outlet side of the first heating tube and the end of the second heating tube adjacent to the first heating tube to form a second connecting cavity. The pot body parts of the two groups of second heating tubes near the hot air inlet side of the first heating tube are recessed inward to form a first connecting cavity. The pot body between the other group of second heating tubes away from the first heating tube and the exhaust pipe is recessed inward to form a third connecting cavity.

[0009] Preferably, there is one first heating tube and multiple second heating tubes and exhaust pipes; the multiple second heating tubes are arranged in a matrix and divided into two groups; the total cross-sectional area of ​​each group of second heating tubes is smaller than the cross-sectional area of ​​the first heating tube, and the total cross-sectional area of ​​the multiple exhaust pipes is smaller than the cross-sectional area of ​​a single group of second heating tubes; by gradually reducing the flow cross-sectional area, the flue gas flow pressure is increased and the exhaust gas discharge speed is accelerated.

[0010] Preferably, there are eighteen second heating tubes, and the eighteen second heating tubes are arranged in a specific pattern. The exhaust pipes are arranged in a matrix-like, even pattern, and there are six exhaust pipes in total. Matrix arrangement.

[0011] Preferably, the lower two sides of the pot shell converge from the outside to the inside, forming a funnel-shaped cavity structure, which facilitates the sedimentation and collection of residue.

[0012] Preferably, an oil drain port is provided on the side of the pot shell.

[0013] Preferably, the first connecting cavity, the second connecting cavity, and the third connecting cavity form a downward-sloping guide surface inside the pot body, which facilitates the residue to slide down to the bottom of the pot body.

[0014] Preferably, the pot body further includes a first sealing plate, a second sealing plate, and a third sealing plate. Connectors are provided at the four corners of the interior of the first connecting cavity, the second connecting cavity, and the third connecting cavity. The first sealing plate is installed on the connector of the first connecting cavity, the second sealing plate is installed on the connector of the second connecting cavity, and the third sealing plate is installed on the connector of the third connecting cavity.

[0015] Preferably, it also includes a support frame and an insulation board, with the support frame welded to the outside of the pot body and the insulation board covering the outside of the pot body.

[0016] The beneficial effects of this invention are as follows: 1. This invention constructs an integrated internal heat exchange heating structure by inserting multiple heating tubes inside a rectangular pot, replacing the traditional external open flame heating or external electric heating universal equipment structure. It effectively solves the technical problems of traditional general-purpose fryers being simple in structure, lacking a dedicated heat exchange structure, and unable to adapt to the special potato shred frying process. The overall structure has a high degree of integration and a compact layout, enabling uniform heat exchange throughout the pot, providing basic structural support for the stable frying of spicy potato shreds. At the same time, the overall structure of the equipment is robust and adaptable to the basic working conditions of biofuel heating, effectively making up for the industry shortcomings of traditional equipment structures being incompatible with biofuel heating and having poor adaptability.

[0017] 2. This invention utilizes a recessed molding structure with three sets of built-in connecting cavities to achieve a smooth transition and connection between multiple sets of second heating tubes, the first heating tube, and the exhaust pipe. This effectively solves the technical problems of uneven flue gas distribution, disordered flow, and numerous heat exchange dead zones in multi-pipe heat exchange structures. It can buffer, rectify, divide, and merge high-temperature flue gas, ensuring uniform flue gas flow through each heating tube set. This eliminates localized temperature differences within the pot, completely avoiding quality defects such as burnt or undercooked areas in spicy potato shreds, and significantly improving the consistency of batch-processed product quality.

[0018] 3. This invention forms a mechanical pressurized exhaust structure by setting up a progressively decreasing cross-sectional area of ​​the pipeline flow path. It eliminates the need for additional power equipment such as fans, effectively solving the technical problems of waste gas retention, poor flow, backflow, and reduced heat exchange efficiency during the heat exchange process of biofuel flue gas. Relying on fluid mechanics principles, it automatically increases the flow pressure and velocity of the flue gas, achieving rapid pumping out of the waste gas and ensuring long-term, efficient, and stable operation of the heat exchange circuit. It features zero power loss, low failure rate, further reducing equipment maintenance and electricity costs, and is suitable for long-term continuous batch processing conditions.

[0019] 4. This invention employs a precise layout of eighteen second heating tubes arranged in a 3×6 matrix and six exhaust pipes arranged in a 2×3 matrix. This effectively solves the problems of messy heat exchange tube arrangement, uneven heat exchange area, and disordered exhaust in traditional fryers. It maximizes the utilization of the internal space of the fryer, achieving uniform heat exchange throughout the entire area and a constant and balanced oil temperature. At the same time, the matrix-style exhaust distribution is uniform, with low exhaust resistance and high smoke extraction efficiency, further improving the overall heat exchange efficiency and operational stability of the equipment, and adapting to the standardized, large-scale frying needs of spicy shredded potatoes. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention patent; Figure 2 This is a schematic diagram of the overall structure on the other side of the present invention patent; Figure 3 This is a schematic diagram of the structure of the other side of the pot body of this invention patent; Figure 4 This is a schematic diagram of the other side of the pot body of the present invention. Figure 5 This is a cross-sectional view of the pot body of this invention patent; The reference numerals in the accompanying drawings include: 100, bracket; 200, insulation plate; 300, pot body; 301, pot shell; 302, oil drain port; 303, first heating tube; 304, second heating tube; 305, exhaust port; 306, exhaust pipe; 307, first connecting cavity; 308, connector; 309, inclined guide surface; 310, first sealing plate; 311, second connecting cavity; 312, third connecting cavity; 313, second sealing plate; 314, third sealing plate. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] In the description of this invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "top surface," "bottom surface," "inner," "outer," "inner side," and "outer side," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0024] In the description of this invention, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. Where the terms "first," "second," and "third" are used for descriptive purposes and to distinguish technical features, they should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the sequential relationship of the indicated technical features.

[0025] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" 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 communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. The embodiments of this invention will now be described according to its overall structure.

[0026] The following is in conjunction with the appendix of this invention. Figures 1 to 5 The invention, along with the complete technical solutions described in the claims, provides a detailed, complete, and rigorous explanation of the specific embodiments, overall assembly structure, positional relationships of various components, precise connection and assembly relationships, working principle, proprietary process adaptation logic, and comprehensive beneficial technical effects of the invention. This invention addresses the technical shortcomings and industry pain points of existing spicy potato shreds frying equipment through targeted structural innovation. It solves numerous technical defects such as severe pollution from traditional open-flame frying equipment, excessively high energy consumption costs of electric heating equipment, incompatibility of general-purpose frying equipment with biofuel heating characteristics, uneven oil temperature, cumbersome residue cleaning, and difficulty in standardizing product quality. It is a dedicated biofuel-heated frying equipment designed for the batch, standardized, high-quality, and low-cost production of spicy potato shreds, possessing extremely high industry applicability and promotional value.

[0027] This invention discloses a biofuel-heated deep fryer for spicy shredded potatoes. The whole machine is an integrated structure, mainly composed of eight core parts: a bottom support and protection structure, an external heat insulation structure, a core pot body frying heat exchange structure, a biofuel flue gas heat exchange component, a three-stage flue gas connecting and guiding cavity structure, a sealing and plugging component, a centralized exhaust gas component, and a residue collection and sewage discharge structure. Specific sub-components include a bracket (100), a heat insulation plate (200), a pot body (300), a pot shell (301), an oil drain (302), a first heating tube (303), a second heating tube (304), an exhaust port (305), an exhaust pipe (306), a first connecting cavity (307), a connector (308), an inclined guide surface (309), a first sealing plate (310), a second connecting cavity (311), a third connecting cavity (312), a second sealing plate (313), and a third sealing plate (314). It is also equipped with an external biofuel combustion chamber to form a complete closed-loop heating and heat exchange system. The core innovation of this invention is the use of indirect heat exchange technology in high-temperature flue gas pipelines for biofuels. This completely achieves physical isolation between the combustion heat source and the frying oil, eliminating the inherent defects of traditional direct open flame heating and electric heating rod immersion in oil. Combined with a step-by-step variable diameter pressurized exhaust structure, a funnel-shaped residue settling structure, and a fully enclosed insulation structure, it is fully adapted to the frying process characteristics of spicy potato shreds. This solves a series of industry problems such as easy blackening, inconsistent taste, rapid oil loss, high processing costs, and a dirty and messy production environment when processing spicy potato shreds with traditional equipment.

[0028] The external support and insulation structure of the whole machine serves as the basic protection and energy-saving component of the equipment. It mainly includes a bracket (100) and an insulation board (200) to provide support and heat insulation for the pot body structure. The bracket (100) is the load-bearing support structure of the whole machine. It is made of high-strength carbon steel metal profile and is integrally welded by full welding process. The whole structure is a square frame-type hollow structure. The bracket (100) is fixedly welded to the four sides of the bottom of the outer side of the pot body (300). It is completely attached to the bottom outer wall of the pot shell (301) without gaps or looseness, so as to realize the suspended installation of the pot body (300).

[0029] The insulation board (200) is an energy-saving and heat-insulating structure for the equipment. It is made of high-temperature resistant and flame-retardant insulation material and has the characteristics of low thermal conductivity, high temperature resistance, flame retardancy, waterproofness, and resistance to aging. The insulation board (200) is fully covered and fixed to all the outer walls of the pot body (300) by a close-fitting and wrapping method, including the four sides of the pot shell (301) and the upper edge connection position, with no exposed metal shell area and no dead corners for heat preservation. During the continuous frying operation of the equipment, the cooking oil in the pot is maintained in the exclusive frying temperature range of spicy potato shreds for a long time. The metal shell of the pot shell has strong thermal conductivity and is very easy to lose a lot of heat to the external environment, resulting in oil temperature fluctuations, increased heating energy consumption, and aggravated biofuel consumption. The present invention, through the fully wrapped insulation board (200) structure, can effectively block the conduction, radiation, and convection loss of high temperature heat inside the pot body, and minimize ineffective heat loss. On the one hand, it can continuously stabilize the frying temperature inside the pot, avoiding fluctuations in oil temperature caused by changes in ambient temperature and prolonged operation. This ensures that the frying temperature and time are consistent for each batch of spicy potato shreds, achieving uniformity in product color, crispness, and flavor. On the other hand, it significantly improves the thermal utilization rate of biofuels, reduces ineffective consumption of biofuels, further lowers the production cost of mass-producing spicy potato shreds, and improves the economic benefits for small and medium-sized processing businesses. Simultaneously, the insulation plate can insulate the pot surface from high temperatures, preventing burns to workers during operation, improving equipment safety, and effectively reducing thermal noise during operation, thus optimizing the production environment.

[0030] The pot shell (301) adopts a composite structure design that is wider at the top and narrower at the bottom. The upper part is a standard rectangular open cavity structure with a cavity volume designed with precise proportions to meet the needs of single-batch frying of large quantities of spicy potato shreds. The open structure facilitates automated frying machines for feeding, turning, and scooping operations, making it suitable for the normalized batch production mode of small processing plants. Starting from the middle of the pot shell (301), the two side plates smoothly converge from top to bottom and from the outside to the inside, forming a regular funnel-shaped cavity structure at the bottom of the pot shell (301). The transition surface is smooth and fluid, which enables automatic sedimentation of residue.

[0031] In the actual frying process of spicy shredded potatoes, the starch, scraps, and waste adhering to the surface of the potato shreds will fall into the oil layer during high-temperature frying. In traditional flat-bottomed fryers, the residue will be suspended and dispersed throughout the oil layer, continuously heated at high temperatures, and will easily carbonize and turn black quickly. This not only directly contaminates the cooking oil, accelerates its oxidation and deterioration, and shortens the oil replacement cycle, increasing production material costs, but the carbonized residue will also adhere to the surface of the potato shreds, causing the finished product to turn black, taste bitter, and contain too many impurities, seriously affecting the appearance and flavor of the spicy shredded potatoes, and failing to meet the production requirements of standardized specialty snacks. The funnel-shaped bottom structure utilizes the principle of gravity settling, so that the starch residue and potato shred scraps falling from the oil layer are not affected by the oil flow disturbance. They can continuously converge and settle towards the bottom center of the pot along the smooth, inclined wall of the funnel. Most of the residue can be concentrated in the bottom area of ​​the funnel, effectively preventing the residue from being suspended in the middle and upper core frying oil layer. This reduces the probability of high-temperature carbonization of residue, significantly slows down the oxidation and deterioration of edible oil, extends the service life of the oil, reduces the frequency of waste oil replacement, and lowers production consumable costs; at the same time, it ensures that the upper frying oil layer is clean and transparent. In addition, the concentrated sedimentation of residue does not require repeated manual retrieval; staff only need to periodically clean the bottom of the pot, greatly reducing the intensity of manual maintenance and improving production continuity and efficiency.

[0032] A circular oil drain port (302) is provided through the lower side wall of the pot shell (301), near the top of the funnel cavity. The oil drain port (302) is equipped with a matching sealing plug, which keeps it sealed during operation to prevent oil leakage. As a waste oil discharge channel, the oil drain port (302) is located at the lowest oil storage reference level of the pot body, ensuring that waste oil and residual oil in the pot are completely drained without any residual oil accumulation, thus preventing the long-term accumulation and deterioration of residual waste oil from contaminating the newly changed oil. When the equipment completes mass production and needs to change the oil or clean the equipment, the waste oil in the pot can be quickly and thoroughly discharged by simply opening the oil drain port plug.

[0033] This invention abandons the traditional structure of oil-immersed electric heating tubes and direct open flame heating, and innovatively adopts a two-stage tube indirect heat exchange structure of a single main heating tube and multiple matrix-type auxiliary heating tubes. The heating heat exchange assembly includes one first heating tube (303) and eighteen second heating tubes (304). All heating tubes are high-temperature resistant seamless metal heat exchange tubes with high thermal conductivity, strong heat resistance, and are not easy to rust, making them suitable for continuous heat exchange of high-temperature flue gas from biofuels. The entire heating assembly is completely arranged in the lower middle part of the oil cavity inside the pot shell (301), and is completely immersed in the edible oil throughout the process. It does not come into contact with the outside air or combustion smoke, and heat is transferred only through the tube walls, thus completely achieving physical isolation between the heat source flue gas and the frying edible oil.

[0034] The first heating tube (303) is the main heat inlet pipe, with a diameter larger than that of the second heating tube (304). It horizontally penetrates the left and right side walls of the pot body (300). Both ends of the tube are welded and sealed to the pot shell wall to ensure no flue gas leakage or oil leakage at the connection. The outer air inlet end of the first heating tube (303) is sealed and connected to the flue gas outlet of the external biofuel chamber. The assembly connection is sealed with a sealing gasket to ensure that the high-temperature flue gas generated by combustion inside the biofuel chamber can be completely, without loss or leakage, introduced into the first heating tube (303). As a primary heat exchange and flue gas diversion channel, the first heating tube (303) plays a core role in preliminary heat exchange and uniform delivery of high-temperature flue gas. After the high-temperature flue gas enters the tube, it quickly transfers heat to the surrounding oil through the tube wall, achieving the initial heating of the oil in the pot.

[0035] There are a total of eighteen secondary heating tubes (304), which are secondary auxiliary heat exchange pipelines. The eighteen secondary heating tubes (304) are arranged in parallel in the oil cavity inside the pot body (300) according to a strict 3×6 matrix uniform arrangement rule. The overall distribution is uniform and the spacing is consistent, which can maximize the use of the internal space of the pot body to increase the heat exchange area. The eighteen secondary heating tubes (304) are equally divided into two groups of independent heat exchange pipelines, and the two groups of pipelines are symmetrically distributed. Both ends of all secondary heating tubes (304) also penetrate through the two side walls of the pot body (300) and are welded and sealed to ensure the continuity of the tube body and the overall sealing performance. Compared to a single-tube heat exchange structure, the multi-matrix second heating tube layout of this invention significantly increases the contact area between the heat exchange tube wall and the cooking oil, doubling the heat exchange efficiency. It can quickly raise the oil temperature in the pot to the exclusive frying temperature for spicy shredded potatoes, while maintaining a constant oil temperature throughout the entire process. This completely solves the temperature difference problem of local high and low temperatures in traditional equipment, ensuring that the frying speed and doneness of the shredded potatoes in all areas of the pot are completely consistent, eliminating quality defects such as undercooked or burnt potatoes.

[0036] The entire system forms a complete, closed-loop, and directional flue gas heat exchange path. The specific flow sequence is as follows: high-temperature flue gas is generated by the full combustion of biofuel in the biofuel chamber → it is sealed and introduced into the first heating tube (303) to complete the first-stage heat exchange → the flue gas is transported to the second connecting chamber (311) to complete rectification and diversion → it is evenly introduced into one of the second heating tubes (304) to complete the second-stage area heat exchange → the flue gas is collected in the first connecting chamber (307) to complete the merging and diversion → it is transported to the third connecting chamber (312) to complete the waste gas collection → it is diverted to multiple exhaust pipes (306) → and uniformly discharged to the external environment. During the entire flow heat exchange process, the high-temperature flue gas is always sealed inside the pipes and connecting chambers and flows directionally. It does not come into any contact with the cooking oil and spicy potato shreds in the pot. The oil is heated only through the heat conduction effect of the metal pipe wall. This isolated heat exchange structure eliminates the problems of combustion dust, oil fumes, and sulfur impurities mixed into the oil and adhering to the food in the traditional open flame heating method.

[0037] To achieve smooth transfer, uniform diversion, and directional flow of flue gas between the first heating tube and the two sets of second heating tubes, the present invention provides a three-stage flue gas transition cavity structure consisting of a first connecting cavity (307), a second connecting cavity (311), and a third connecting cavity (312) by integrally recessing the main body plate of the pot shell (301) at the pipeline transition position inside the pot body (300). The three-stage cavity is integrally formed with the pot shell.

[0038] The first connecting cavity (307) is formed in the pot body area on the side of the two sets of second heating tubes (304) near the hot gas inlet of the first heating tube (303). It is formed by the inward indentation of the pot shell plate to form a regular transition cavity. Its core function is to uniformly collect and rectify the flue gas after it has passed through the second heating tube, thereby further improving the overall heat exchange uniformity inside the pot.

[0039] The second connecting cavity (311) is formed in the pot body between the hot gas outlet side of the first heating tube (303) and the end of a set of second heating tubes (304) adjacent to that side. It is used to receive the high-temperature flue gas output from the first heating tube, buffer, rectify and evenly distribute the high-speed flowing high-temperature flue gas, so that the high-temperature flue gas can be smoothly and evenly distributed into the interior of the first set of second heating tubes, ensuring the stable and efficient operation of the secondary heat exchange system.

[0040] The third connecting cavity (312) is formed at the docking position of another set of second heating tubes (304) and exhaust pipes (306) that are far away from the first heating tube (303). Its core function is to collect all the low-temperature exhaust gas after heat exchange, collect it uniformly and distribute it to each exhaust pipe, so as to achieve rapid exhaust gas discharge.

[0041] Meanwhile, the inner walls of all the three-level connecting cavities form a downward-sloping guide surface (309) inside the pot. The guide surface allows the starch residue and potato shreds that fall off in the oil layer to continuously converge and settle towards the bottom of the pot along the smooth inclined wall. Most of the residue can be concentrated in the bottom area of ​​the funnel, effectively preventing the residue from being suspended in the middle and upper core frying oil layer.

[0042] Addressing the technical challenges of poor flue gas flow, waste gas retention, flue gas backflow, and reduced heat exchange efficiency in traditional heat exchange equipment, this invention precisely matches the cross-sectional area of ​​each level of pipeline to form a gradient-narrowing structure. Utilizing Bernoulli's principle of fluid mechanics, it achieves automatic pressurization and exhaust without power, significantly simplifying the equipment structure and reducing equipment failure rate and maintenance costs.

[0043] The single first heating tube (303) has the largest flow cross-sectional area, serving as the initial flow channel for flue gas. Among the two sets of second heating tubes (304), the total flow cross-sectional area of ​​each set of second heating tubes is strictly smaller than that of the first heating tube (303), achieving the first reduction in diameter and pressurization. The total flow cross-sectional area of ​​the multiple exhaust pipes (306) is strictly smaller than that of a single set of second heating tubes (304), achieving the second reduction in diameter and pressurization, forming a gradient flow structure of "large cross-section flue gas inlet - medium cross-section heat exchange - small cross-section flue gas exhaust".

[0044] According to fluid mechanics principles, when gas flows through a closed pipeline, the smaller the cross-sectional area, the faster the fluid velocity and the greater the dynamic pressure. During operation, the high-temperature flue gas generated by biofuel combustion first flows at a low and stable speed within the large-section first heating tube, completing initial heat exchange and ensuring sufficient heat release. Subsequently, the flue gas enters the second heating tube group with a reduced cross-sectional area, where the flue gas velocity and pressure increase simultaneously, accelerating the secondary heat exchange rate and improving heat exchange uniformity. Finally, the flue gas enters the exhaust pipe group with an even smaller cross-sectional area, where the velocity and pressure reach their peak, forming a continuous suction and pushing force that quickly exhausts the cooled waste gas after heat exchange. This structure creates a full-process directional negative pressure suction effect, effectively preventing waste gas from stagnating and accumulating inside the pipeline, high-temperature heat buildup, and backflow of flue gas into the biofuel chamber, ensuring that the entire flue gas heat exchange circuit is always in a highly efficient, stable, and unidirectional flow state.

[0045] To ensure the airtightness of the three-stage connecting cavity and ensure that the flue gas flows completely along the preset pipeline, the main components include connectors (308), first sealing plate (310), second sealing plate (313), and third sealing plate (314). All components are made of high-temperature resistant and high-strength metal materials, which are suitable for long-term high-temperature working environments, are not easily deformed or aged, and have long-lasting and stable sealing performance.

[0046] Metal connectors (308) are symmetrically fixed at the four corners of the first connecting cavity (307), the second connecting cavity (311), and the third connecting cavity (312). The connectors (308) are integrally fixed to the inner wall of the cavity by welding, which is firm and stable under force, and provides precise installation positioning and load-bearing support points for the sealing plate. The first sealing plate (310), the second sealing plate (313), and the third sealing plate (314) are sealing plates that are completely matched with the opening size of each connecting cavity. They are respectively installed and fixed on the connectors (308) of the first connecting cavity (307), the second connecting cavity (311), and the third connecting cavity (312) by bolt fastening. High temperature resistant sealing gaskets are added between the sealing plates and the cavity openings to achieve a complete fit and seal without any gaps or dead corners for air penetration.

[0047] This sealing structure can completely block the outer opening of the three-stage connecting cavity, so that the three-stage connecting cavity, heating pipe and exhaust pipe form a closed integrated flue gas circulation loop, forcing the high-temperature flue gas to flow only along the preset pipeline and cavity channel, and completely preventing the high-temperature flue gas from leaking out from the cavity opening gap.

[0048] The exhaust assembly of this invention consists of six exhaust pipes (306), which is the core structure for centralized exhaust gas discharge of the equipment. The six exhaust pipes (306) are evenly arranged in a 2×3 matrix, and the overall air inlet end is uniformly connected and fixed at the air outlet end of the third connecting cavity (312), completely communicating with the third connecting cavity and sealing the connection to prevent exhaust gas leakage. During the operation of the equipment, all the low-temperature exhaust gas that has completed heat exchange is uniformly collected inside the third connecting cavity (312), and evenly distributed and synchronously discharged outward through the six exhaust pipes arranged in a matrix. Compared with a single large-diameter exhaust pipe, the exhaust gas distribution effect of the multi-pipe matrix exhaust structure is better, and the exhaust pressure is more uniform. It can effectively avoid the problems of high exhaust resistance, exhaust gas accumulation, and excessive local pressure in a single pipe exhaust, and further improve the flue gas flow rate and exhaust stability.

[0049] The foregoing description of specific exemplary embodiments of the present invention is for illustrative and explanatory purposes. These descriptions are not intended to limit the invention to the precise forms disclosed, and it is obvious that many changes and variations can be made based on the above teachings. Although embodiments of the invention have been shown and described, these specific embodiments are merely explanations of the invention and are not intended to limit it. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. The purpose of selecting and describing exemplary embodiments is to explain the specific principles of the invention and its practical application, so that those skilled in the art, after reading this specification, can make modifications, substitutions, variations, and various choices and changes to the embodiments as needed without departing from the principles and spirit of the invention, provided that such modifications, substitutions, variations, and choices and changes are within the scope of the claims of the invention and are protected by patent law.

Claims

1. A biofuel-heated deep fryer specifically for spicy shredded potatoes, characterized in that, It includes a pot body (300), which includes a pot shell (301) and heating tubes; the pot shell (301) is rectangular in shape, and the heating tubes are multiple and pass through the interior of the pot body (300).

2. The biofuel-heated deep fryer for spicy shredded potatoes according to claim 1, characterized in that, It also includes an exhaust pipe (306). The heating pipe includes a first heating pipe (303) and a second heating pipe (304). The first heating pipe (303) is connected to the second heating pipe (304), and the exhaust pipe (306) is connected to the second heating pipe (304). The first heating pipe (303) extends through and connects to both sides of the pot body (300) at both ends, and is connected to the biofuel compartment. The high-temperature hot gas generated by the combustion of biofuel is introduced into the first heating pipe (303), and the second heating pipe (304) extends through and connects to both ends of the pot body. (300) On both sides, hot air is introduced into the second heating pipe (304) through the first heating pipe (303). The edible oil in the pot (300) is heated by heat conduction through the pipe wall to achieve heat source isolation from oil, and to prevent oil smoke and impurities from mixing into the oil. The high-temperature hot air generated by the combustion of biofuel in the biofuel chamber flows through the first heating pipe (303) and the second heating pipe (304) in sequence. The oil in the pot (300) is heated by heat conduction through the pipe wall. After the heat exchange is completed, the low-temperature exhaust gas is finally discharged to the outside through the exhaust pipe (306) to achieve centralized emission of flue gas.

3. The biofuel-heated deep fryer for spicy shredded potatoes according to claim 2, characterized in that, The second heating tube (304) is provided in multiple units, and the multiple second heating tubes (304) are divided into two groups; the pot body (300) is recessed inward on the hot air outlet side of the first heating tube (303) and between the end of a group of second heating tubes (304) adjacent to the first heating tube (303) to form a second connecting cavity (311); the pot body (300) of the two groups of second heating tubes (304) near the hot air inlet side of the first heating tube (303) is recessed inward to form a first connecting cavity (307); the pot body (300) between the other group of second heating tubes (304) away from the first heating tube (303) and the exhaust pipe (306) is recessed inward to form a third connecting cavity (312).

4. The biofuel-heated deep fryer for spicy shredded potatoes according to claim 2, characterized in that, The first heating tube (303) is one, and the second heating tube (304) and the exhaust pipe (306) are multiple; the multiple second heating tubes (304) are arranged in a matrix and divided into two groups; the total cross-sectional area of ​​each group of second heating tubes (304) is smaller than the cross-sectional area of ​​the first heating tube (303), and the total cross-sectional area of ​​the multiple exhaust pipes (306) is smaller than the cross-sectional area of ​​a single group of second heating tubes (304); by gradually reducing the flow cross-sectional area, the flue gas flow pressure is increased and the exhaust gas discharge speed is accelerated.

5. A biofuel-heated deep fryer for spicy shredded potatoes according to claim 2, characterized in that, There are eighteen second heating tubes (304), and the eighteen second heating tubes (304) are arranged in a 3-dimensional pattern. The exhaust pipes (306) are arranged in a matrix evenly, and there are six exhaust pipes (306) in a 2-axis configuration.

3. Matrix arrangement.

6. The biofuel-heated deep fryer for spicy shredded potatoes according to claim 1, characterized in that, The lower two sides of the pot shell (301) converge from the outside to the inside to form a funnel-shaped cavity structure, which facilitates the sedimentation and collection of residue.

7. The biofuel-heated deep fryer for spicy shredded potatoes according to claim 1, characterized in that, The pot shell (301) is provided with an oil drain port (302) on its side.

8. The biofuel-heated deep fryer for spicy shredded potatoes according to claim 3, characterized in that, The first connecting cavity (307), the second connecting cavity (311) and the third connecting cavity (312) form a downwardly inclined guide surface (309) inside the pot body (300).

9. A biofuel-heated deep fryer for spicy shredded potatoes according to claim 3, characterized in that, The pot body (300) also includes a first sealing plate (310), a second sealing plate (313) and a third sealing plate (314). Connectors (308) are provided at the four corners of the interior of the first connecting cavity (307), the second connecting cavity (311) and the third connecting cavity (312). The first sealing plate (310) is installed on the connector (308) of the first connecting cavity (307), the second sealing plate (313) is installed on the connector (308) of the second connecting cavity (311), and the third sealing plate (314) is installed on the connector (308) of the third connecting cavity (312).

10. A biofuel-heated deep fryer for spicy shredded potatoes according to claim 9, characterized in that, It also includes a support (100) and an insulation board (200), the support (100) being welded to the outside of the pot body (300) and the insulation board (200) covering the outside of the pot body (300).

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