Energy-saving variable airflow cooking drying furnace

Abstract

The invention discloses an energy-saving variable airflow cooking drying furnace which comprises a furnace body, an air direction adjusting mechanism, a pneumatic air inlet valve, a circulating fan, an exhaust fan, a heat exchanger, an air outlet pipe and an air baffle, a plurality of cavities arranged in the front-back direction are formed in the furnace body, and the circulating fan is further installed at the top of each cavity; an output shaft of the circulating fan is downwards connected with a centrifugal impeller; the centrifugal impeller is positioned below the top plate of the furnace body; the wind shield is arranged below the centrifugal impeller, and a positive pressure cavity is defined by the wind shield and the top plate of the furnace body; side plates are arranged at the left end and the right end of the wind shield respectively, and vertical air channels are formed between the side plates and the side wall of the furnace body; the air direction adjusting mechanism comprises a rotatable baffle, and the baffle is installed below the side plate through a hinge assembly and arranged corresponding to the ventilation opening, so that the equipment can dynamically switch different air flow circulation modes according to the process requirements of different products in the production process.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of drying furnace, in particular to an energy-saving variable air flow cooking and drying furnace. BACKGROUND

[0002] In the food industry, drying furnace is a widely used core equipment. For a long time, hot air circulation type drying furnace has become the industry mainstream because of its uniform heating and accurate temperature control. However, the internal air flow organization mode is always the core technical difficulty affecting the comprehensive performance of the equipment.

[0003] The existing equipment is mainly constructed around three air flow modes: one is vertical air flow mode (air supply on both sides and air return in the middle), which has short air flow path and small resistance, and is suitable for hanging products, but it is easy to cause uneven air flow penetration and air return blockage for multi-layer flat materials, which limits its application range; two is horizontal air flow mode (left air supply and right air return or right air supply and left air return), which is suitable for flat products, but it depends on complex air baffle structure to realize air flow distribution, which not only increases the manufacturing cost and cleaning difficulty, but also easily forms a health hazard, and it is difficult to effectively increase the loading layers due to structural limitations, which restricts the equipment capacity; three is double-motor double-channel structure, which realizes more flexible air flow combination through two independent systems, but has the significant shortcomings of high equipment complexity, large energy consumption, large floor area and strict requirements for workshop space, which makes its application cost high and the application scene limited.

[0004] In summary, the existing technologies have obvious limitations, or the mode is single and the application product is narrow, or the structure is complex and the cost is high, and it is easy to form a health dead angle, or the space utilization rate is low. Therefore, a new type of solution is needed, which has adjustable air flow mode, simplified structure, energy saving and high efficiency, good health and high space utilization rate. SUMMARY

[0005] To solve the above technical problems, the present application relates to an energy-saving variable air flow cooking and drying furnace, which has a simple and reliable structure, effectively solves the above technical problems, and is suitable for popularization and use. In order to achieve the above purpose, the present application realizes the following technical scheme: An energy-saving variable air flow cooking and drying furnace, comprising a furnace body, a wind direction adjusting mechanism, a pneumatic air inlet valve, a circulating fan, an exhaust fan, a heat exchanger, an air outlet pipe and a wind shield, The furnace body is internally provided with a plurality of chambers arranged in the front-rear direction, the top of each chamber is provided with the pneumatic air inlet valve and the air outlet, and each air outlet is connected to a main pipe through a branch pipe, and the main pipe is connected with the exhaust fan; The top of each chamber is also provided with a circulating fan, the output shaft of the circulating fan is connected downwardly with a centrifugal impeller, the centrifugal impeller is located below the top plate of the furnace body; the baffle is arranged below the centrifugal impeller and between the top plate of the furnace body to form a positive pressure chamber; the left and right ends of the baffle are respectively provided with side plates, and the side plates and the side walls of the furnace body form vertical air ducts therebetween; The baffle is provided with an air return opening below the centrifugal impeller, and the heat exchanger is arranged below the air return opening; The air outlet pipe is arranged below the vertical air duct, the air outlet of the air outlet pipe is provided with an air outlet plate with an air outlet hole, and the side of the air outlet pipe facing the center of the furnace body is provided with a ventilation opening; the air direction adjusting mechanism comprises a baffle that can be rotated, the baffle is installed below the side plate through a hinge assembly, and the baffle is arranged corresponding to the ventilation opening; The baffle has two working positions, the first working position is to rotate upward to cover the bottom outlet of the vertical air duct, and the second working position is to rotate downward to close the ventilation opening; By controlling the working positions of the left and right baffles, three air circulation modes can be realized, When the left and right baffles are both in the second working position, a double-vertical air flow mode of air outlet on both sides and air return in the middle is formed; When the left baffle is in the first working position and the right baffle is in the second working position, a mixed air flow circulation mode of air outlet on the right side vertical air duct, air return in the middle and air return on the left side through the ventilation opening is formed; When the left baffle is in the second working position and the right baffle is in the first working position, a mixed air flow circulation mode of air outlet on the left side vertical air duct, air return in the middle and air return on the right side through the ventilation opening is formed.

[0006] On the basis of the above scheme and as a preferred scheme of the above scheme: further comprising an air equalization and guide assembly, the air equalization and guide assembly is arranged below the heat exchanger and between the air outlet pipes on both sides, the air equalization and guide assembly comprises a partition plate, a guide plate and a middle support plate, a plurality of partition plates are arranged in the horizontal direction at equal intervals, two groups of guide plates are arranged above the partition plates and symmetrically on the left and right sides, a gap is left between the two groups of guide plates to form a converging air opening, and the middle support plate is arranged above the guide plates and directly above the converging air opening.

[0007] On the basis of the above scheme and as a preferred scheme of the above scheme: the air direction adjusting mechanism further comprises an adjusting push rod and a pneumatic cylinder, the cylinder body of the pneumatic cylinder is butted against the top plate of the furnace body, the piston rod of the pneumatic cylinder is connected downwardly to one end of the adjusting push rod, and the other end of the adjusting push rod is connected to the baffle.

[0008] On the basis of the above scheme and as a preferred scheme of the above scheme: the bottom of the chamber is provided with an arc-shaped corner.

[0009] Compared with the prior art, the application has the advantages of being innovative and beneficial, and the application can dynamically switch different air flow circulation modes according to the process requirements of different products in the production process by virtue of the real-time adjustable air flow guiding mechanism, effectively breaking through the limitation of the traditional vertical air flow mode in processing multilayer materials due to poor return air, avoiding the dependence of the horizontal air flow mode on the complex air baffle structure and the cleaning difficulty and cost problem caused by the dependence, and without the need of using a high-energy-consumption and high-cost double-motor double-channel system. Finally, the application realizes efficient and flexible multi-category processing capacity on a single device, significantly improves the device applicability, energy utilization efficiency and health protection level, and has significant practical value and economy. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1 is a schematic diagram of the external three-dimensional structure of the device; Figure 2 is a schematic diagram of the baffle; Figure 3 is a schematic diagram of the air equalizing and guiding assembly; Figure 4 is a schematic diagram of the first mode operation; Figure 5 is a schematic diagram of the second mode operation; Figure 6 is a schematic diagram of the third mode operation; Figure 7 is a schematic diagram of the valve control. DETAILED DESCRIPTION

[0011] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme in the embodiments will be described clearly and completely in combination with the drawings in the embodiments. However, the following specific embodiments and examples are only for the purpose of illustration, and are not a limitation on the present application.

[0012] In the description of the present application, it should be understood that the terms “longitudinal”, “transverse”, “upper”, “lower”, “front”, “rear”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inner”, “outer” and the like indicate the orientation or positional relationship based on the drawings shown, and are only for the purpose of facilitating the description of the present application, and are not indicative or implied that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. Figure 1 The directions or positional relationships shown are only for the purpose of facilitating the description of the present application, and are not indicative or implied that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0013] In the description of the present application, the terms “first”, “second” and the like are only for the purpose of description, and cannot be understood as indicative or implied of relative importance or implied indication of the number of technical features indicated.

[0014] To solve the long-standing technical bottlenecks of traditional drying equipment in air flow organization, energy consumption, hygiene and cleaning, and product adaptability, as shown in Figures 1-7 An energy-saving variable air flow cooking and drying furnace is designed, which comprises a furnace body 1, a wind direction adjusting mechanism, an air inlet valve 2, a circulating fan 3, an exhaust fan 4, a heat exchanger 5, an air outlet pipe 6 and a wind baffle 7, The furnace body 1 is internally provided with a plurality of chambers arranged in the front-rear direction, which allows multiple chambers to work simultaneously and facilitates flexible configuration and adjustment of the number of chambers according to production capacity requirements. Each chamber is a complete and fully functional processing unit that integrates the corresponding key components.

[0015] The top of each chamber is also provided with the circulating fan 3, and the output shaft of the circulating fan 3 is connected downward with a centrifugal impeller 8. The centrifugal impeller 8 is located below the top plate of the furnace body 1. The centrifugal impeller 8 is selected for its excellent performance in generating static pressure, which can effectively overcome system resistance and force air into or suck air into a specific flow channel. The wind baffle 7 is arranged below the centrifugal impeller 8 and between the top plate of the furnace body 1 to form a positive pressure chamber 9. When the impeller rotates, air is first forced into this chamber, making it a high-pressure air source. The left and right ends of the wind baffle 7 are respectively provided with side plates 10, which form vertical air ducts 11 between the side plates 10 and the side walls of the furnace body 1. The airflow in the positive pressure chamber 9 is distributed to the two vertical air ducts 11 under the action of pressure.

[0016] In addition, the top of each chamber is provided with the air inlet valve 2 and the air outlet, and each air outlet is connected to a main pipe 13 through a branch pipe 12. The main pipe 13 is connected to the exhaust fan 4, and the collective exhaust system is responsible for efficiently and uniformly exhausting the humid and hot waste gas generated in multiple chambers outside the furnace. Each air inlet valve 2 is responsible for accurately supplementing fresh dry air into the corresponding chamber when needed. The opening of the air inlet valve and the operation of the exhaust fan 4 are adjusted by the control system. Not only can the humidity in the furnace be accurately controlled to ensure drying efficiency, but also the stability and balance of the pressure in the furnace can be maintained while exhausting, avoiding airflow turbulence and heat loss caused by pressure fluctuations. This is complementary to the adjustable airflow mode inside, and together they form a complete, efficient and controllable hot air circulation environment.

[0017] The wind baffle 7 is provided with an air return port corresponding to the position directly below the centrifugal impeller 8, and the heat exchanger 5 is arranged below the air return port. The efficient heat exchanger 5 is arranged in the negative pressure backflow area, has high heat exchange efficiency and fast heating speed.

[0018] The air outlet pipe 6 is arranged below the vertical air duct 11, and the air outlet thereof is provided with an air outlet plate 14 with air outlet holes, and the air outlet pipe 6 is provided with a ventilation opening 15 on the side thereof facing the center of the furnace body 1, and the air direction adjusting mechanism comprises a rotatable baffle 16 which is arranged below the side plate 10 through a hinge assembly and is arranged corresponding to the ventilation opening 15; The baffle 16 has two working positions, a first working position in which the baffle 16 is rotated upward to cover the bottom outlet of the vertical air duct 11, and a second working position in which the baffle 16 is rotated downward to close the ventilation opening 15; By controlling the working positions of the left and right baffles 16, three air circulation modes can be realized, The first mode is a double-vertical air flow mode in which the left and right baffles 16 are both in the second working position, air is driven by the circulation fan 3, and the air flow is distributed to the left and right vertical air ducts 11 in the positive pressure chamber 9 and flows downward unobstructed, reaches the bottom, passes through the air outlet holes in the air outlet plate 14, and blows into the two sides of the furnace in a relatively vertical direction, then the two air flows meet at the center of the working area (the area of the smoking car carrying products) at the bottom of the furnace and flow upward together, under the action of negative pressure, the air flow passes through the product layer and is finally sucked back to the negative pressure chamber through the air return opening in the center of the baffle 7, and after being heated by the heat exchanger 5, a complete circulation is completed. This mode has a symmetrical and smooth air flow path, small system resistance, and is very suitable for processing of hanging products, and can ensure uniform heating of the products around.

[0019] The second mode is a mixed air flow circulation mode in which the left baffle 16 is in the first working position and the right baffle 16 is in the second working position, the air flow in the positive pressure chamber 9 cannot enter the left vertical air duct 11 which has been closed, and all enters the right vertical air duct 11, the air flow blows out from the air outlet holes on the right side, penetrates the working area of the furnace, and thereafter, most of the air flow is directly "short-circuited" and sucked back from the left side under the action of negative pressure, without the need for forced flow to the leftmost side, the ventilation opening 15 of the air outlet pipe 6 on the left side is opened due to the lifting of the baffle 16 and forms a direct passage with the negative pressure chamber, and at the same time, the air flow in the middle of the furnace still flows back upward through the conventional path, thus forming an asymmetric air flow field in which the right side is mainly air supplied and the left side and the middle are jointly air returned. In the traditional vertical air flow, the resistance increases when penetrating through multiple layers of materials, which easily leads to insufficient air flow for the upper products and poor heating and drying effect. The present mode creates a low-resistance air return shortcut, significantly enhances the driving force of the air flow passing through the product layer, ensures that each layer of product can obtain sufficient hot air exchange, solves the industry problem of insufficient penetration, and completely eliminates the dependence on the difficult-to-clean air grid structure of the traditional horizontal air flow.

[0020] The third mode is a mixed air flow circulation mode formed by the left vertical air duct 11, the middle return air and the right return air through the air vent 15 when the left baffle 16 is in the second working position and the right baffle 16 is in the first working position. The effect is exactly the same as mode two, but the wind direction is simply reversed.

[0021] The core innovation of the scheme is to break through the limitation of fixing only one air flow mode in the past, and to realize dynamic and seamless switching of different air flow circulation modes according to the real-time needs of the processing product type during the working process through a set of ingenious and reliable mechanical structure, so as to integrate the advantages of various traditional furnace types on a single device, successfully avoid the inherent defects, abandon the double-motor double-channel scheme with high energy consumption, and realize the complex air flow organization only with one circulating fan 3.

[0022] The complex air flow organization effect that can only be realized by the double-motor double-channel scheme with high energy consumption and high cost in the past is realized. It abandons the redundant drive system and complex air duct design of the latter, and only uses one circulating fan 3 and its impeller as the only power source to realize intelligent redistribution of the air flow path by adjusting the opening and closing state of the downstream air duct. This not only greatly reduces the manufacturing cost, complexity and failure rate of the device, but also significantly reduces energy consumption from the source, realizing the perfect unity of high performance, high flexibility and low cost, low energy consumption.

[0023] It is further preferred in the embodiment that the air flow uniformity guide assembly is arranged below the heat exchanger 5 and between the two outflow pipes 6 on the sides, and the air flow uniformity guide assembly comprises a partition plate 17, a guide plate 18 and a middle support plate 19. The partition plates 17 are arranged uniformly in the transverse direction. The two groups of guide plates 18 are arranged above the partition plates 17 and symmetrically on the left and right sides, and a gap is left between the two groups of guide plates 18 to form a confluence air vent. The middle support plate 19 is arranged above the guide plates 18 and directly above the confluence air vent. The transverse uniform arrangement of the partition plates 17 first divides the large area of the furnace bottom into multiple regular flow channels, effectively eliminating the problem of uneven air distribution in a wide area. The guide plates 18 guide the rising air flow to smoothly and naturally converge to the center area of the furnace chamber. This assembly significantly improves the uniformity, stability and orderliness of the air flow return path.

[0024] Further preferably in the embodiment, the air direction adjusting mechanism further comprises an adjusting push rod 20 and a cylinder 21, the cylinder body of the cylinder 21 is in abutment with the top plate of the furnace body 1, the piston rod of the cylinder 21 is connected with one end of the adjusting push rod 20 downward, the other end of the adjusting push rod 20 is connected with the baffle 16, the linear motion of the cylinder 21 is converted into the required rotary motion of the baffle 16 through the push rod, the structure is simple and reliable, the transmission efficiency is high, the baffle 16 can be accurately and quickly switched between two preset stations, so that the operator does not need to open the furnace door or perform any manual operation during the production process, the conversion of the air flow mode can be completed through one key of the control system, and the automation degree and operation convenience of the equipment are greatly improved.

[0025] Further preferably in the embodiment, the bottom of the chamber is provided with an arc-shaped corner 22, which can greatly improve the flowability of the air flow in the corner area, the arc-shaped corner 22 realizes smooth transition of the flow line, guides the air flow to smoothly flow along the wall surface, eliminates air flow blockage, and is convenient for cleaning.

[0026] The intelligent control system of the equipment is the core of realizing efficient and accurate processing. An operator can pre-set a complete process curve in the human-machine interface, including parameters such as the process name, duration, target temperature, target humidity, air flow mode and air speed of each stage. After setting is completed, the system main control unit (such as PLC) will automatically analyze and execute the process program.

[0027] As shown in Figure 7 During operation, the control system will adjust the rotating speed of the circulating fan in real time and accurately according to the air speed percentage set for the current process through the frequency converter, so as to realize linear control of the air outlet power. At the same time, the left and right pneumatic damper executing mechanisms will switch in the mode sequence of “left and right air outlet simultaneously → only left air outlet → left and right air outlet simultaneously → only right air outlet” according to the preset program, and the duration of each switching is independently settable. The system strictly calls these parameters in sequence according to the circulation number and from top to bottom and from left to right. The intelligent control strategy of multiple parameters working together can form a very uniform, stable and highly matched hot air and humidity environment in the chamber with the current product processing demand, which effectively eliminates the temperature dead angle and humidity stratification, ensures the uniformity of product processing, and thus exhibits great advantages over traditional equipment in improving the processing quality, shortening the processing cycle, improving the energy utilization efficiency, etc., and significantly improves the processing quality and energy efficiency.

[0028] The above embodiments are only preferred embodiments of the present application, and do not limit the protection scope of the present application, therefore: equivalent changes made by those skilled in the art according to the structure, shape and principle of the present application should be covered within the protection scope of the present application.

Claims

1. An energy-saving variable airflow cooking and drying oven, characterized in that: This includes the furnace body, air direction adjustment mechanism, pneumatic air inlet valve, circulating fan, exhaust fan, heat exchanger, air outlet duct, and baffle plate. The furnace body has multiple chambers arranged in a front-to-back direction. Each chamber has a pneumatic air inlet valve and an air outlet at its top. Each air outlet is connected to a main pipe through a branch pipe, and the main pipe is connected to the exhaust fan. Each chamber is also equipped with a circulating fan at the top, and the output shaft of the circulating fan is connected to a centrifugal impeller facing downwards. The centrifugal impeller is located below the top plate of the furnace body. The baffle plate is set below the centrifugal impeller and forms a positive pressure chamber with the top plate of the furnace body. Side plates are respectively provided at the left and right ends of the baffle plate, and a vertical air duct is formed between the side plates and the side wall of the furnace body. The baffle plate is provided with a return air inlet directly below the centrifugal impeller, and the heat exchanger is located below the return air inlet. The air outlet pipe is located below the vertical air duct, and its air outlet is equipped with an air outlet plate with air outlet holes. The air outlet pipe has a ventilation opening on the side facing the center of the furnace body. The airflow adjustment mechanism includes a rotatable baffle, which is mounted below the side panel via a hinge assembly and is positioned corresponding to the vent. The baffle has two working positions: the first working position is to rotate upward to cover the bottom outlet of the vertical air duct, and the second working position is to rotate downward to close the vent. By controlling the working positions of the left and right side baffles, three airflow circulation modes can be achieved. When both the left and right baffles are in the second working position, a dual vertical airflow pattern is formed with air outlets on both sides and air return in the middle. When the left baffle is in the first working position and the right baffle is in the second working position, a mixed airflow circulation mode is formed, consisting of air outlet from the right vertical air duct, return air in the middle, and return air from the left through the ventilation opening. When the left baffle is in the second working position and the right baffle is in the first working position, a mixed airflow circulation pattern is formed, consisting of air outlet from the left vertical duct, return air in the middle, and return air through the vent on the right.

2. The energy-saving variable airflow cooking and drying oven according to claim 1, characterized in that: It also includes an air distribution and flow guiding component, which is located below the heat exchanger and between the air outlet pipes on both sides. The air distribution and flow guiding component includes a partition, a guide plate, and a central support plate. Several partitions are evenly spaced laterally, and two sets of guide plates are arranged above the partitions and symmetrically arranged on the left and right. A gap is left between the two sets of guide plates to form a converging air outlet. The central support plate is arranged above the guide plates and directly above the converging air outlet.

3. The energy-saving variable airflow cooking and drying oven according to claim 1, characterized in that: The wind direction adjustment mechanism also includes an adjustment push rod and a cylinder. The cylinder body is connected to the top plate of the furnace body, the piston rod of the cylinder is connected downward to one end of the adjustment push rod, and the other end of the adjustment push rod is connected to a baffle.

4. The energy-saving variable airflow cooking and drying oven according to claim 1, characterized in that: The bottom of the chamber has an arc-shaped corner.

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