An automatic pressure relief device for an empty biscuit baking box

Abstract

This utility model relates to the field of food processing equipment and discloses an automatic pressure relief device for an empty cake baking box. It includes: a baking box body, with an inner baking liner inside; a door rotatably connected to one side of the outer wall of the baking box near the inner baking liner; and heating elements and baking racks installed inside the inner baking liner. It also includes a pressure relief mechanism, comprising an exhaust pipe connected to the internal space of the inner baking liner and an intake pipe connected to the outside air, each equipped with a first / second solenoid valve and an exhaust fan at the outlet. The control system uses a timing unit and a temperature sensor for coordinated control. This utility model achieves precise, unmanned pressure relief operation, replacing the traditional manual door opening method. It can automatically exhaust and cool according to a preset program, solving the problem of cakes bursting due to inaccurate manual operation, thus ensuring baking quality and significantly improving product yield and stability.

Description

Technical Field

[0001] This utility model relates to the field of food processing equipment, and in particular to an automatic pressure relief device for an empty cake baking box. Background Technology

[0002] In the baking industry, the shaping quality of many hollow pastries (such as biscuits) is extremely sensitive to the dynamic changes in internal pressure and temperature. During baking, the moisture inside the dough rapidly vaporizes, generating a large amount of high-temperature steam, causing the dough to expand and form a hollow structure. Precisely controlling the pressure release during this process is a key technological step to ensure the final product has a full shape and does not crack. Therefore, targeted improvements to the functionality of baking ovens have significant practical application value.

[0003] Currently, the production of these empty cookies typically uses general-purpose or semi-customized industrial baking ovens. The core structure of these ovens usually includes a baking cavity heated by heating elements and baking racks for holding baking trays. The process mainly involves placing the pre-treated dough into the oven, which has reached a predetermined temperature, for baking. To prevent the dough from bursting due to excessive internal steam pressure at high temperatures, the existing method involves the operator manually opening the oven door at specific points in the baking cycle for brief ventilation and cooling. Once some steam has escaped and the internal pressure has decreased, the door is closed to continue baking.

[0004] However, the aforementioned pressure relief method, which relies entirely on manual intervention, has significant drawbacks in actual production. The core issue lies in the difficulty of guaranteeing the accuracy and consistency of the pressure relief process. First, the timing of opening the door for pressure relief depends entirely on the operator's experience or observation of the external timing unit, which easily introduces time errors. Second, the duration of each door opening is also manually controlled; even slight deviations in duration can lead to significant differences in temperature and pressure changes inside the oven, resulting in either insufficient pressure relief or excessive cooling. This operational uncertainty and instability directly leads to fluctuations in product quality, with large differences in yield between batches, frequently resulting in problems such as dough bursting, poor shaping, or inconsistent taste. This not only affects production efficiency but also causes unnecessary waste of raw materials. Therefore, an automatic pressure relief device for empty cake baking ovens is proposed to solve these problems. Summary of the Invention

[0005] To overcome the above shortcomings, this utility model provides an automatic pressure relief device for empty cake baking boxes, aiming to improve the existing manual door opening pressure relief method. Because the timing and duration of pressure relief are difficult to control precisely, the pressure relief effect is unstable. This arbitrary operation easily leads to problems such as cake dough bursting, low yield, and batch-to-batch quality fluctuations.

[0006] To achieve the above objectives, this utility model provides the following technical solution: an automatic pressure relief device for an empty cake baking box, comprising a baking box body, an inner baking liner inside the baking box body, a heating element and a support frame inside the inner baking liner, a door hinged to one side of the baking box body, the door sealing the opening of the inner baking liner when closed, and a pressure relief system comprising:

[0007] The exhaust pipe connected to the baking liner has an exhaust fan connected to its outlet end, and a first solenoid valve is connected in series on the pipe.

[0008] An air intake pipe connects the external environment to the internal space of the baking liner, and a second solenoid valve is connected in series on the pipe;

[0009] In addition, a temperature sensor is installed inside the baking liner to monitor the baking temperature, a timing unit is installed outside the baking oven to record time, and a controller is electrically connected to the timing unit, the temperature sensor, the first solenoid valve, the second solenoid valve, the exhaust fan, and the heating element. The controller is configured to perform the following timing control: when the timing unit reaches a preset pressure relief time point, the power supply to the heating element is cut off, the first solenoid valve and the second solenoid valve are opened, and the exhaust fan is started for ventilation; when the temperature sensor detects a value that drops to a set threshold, the exhaust fan is turned off, the first solenoid valve and the second solenoid valve are closed, and the heating element is restarted.

[0010] As a further description of the above technical solution: a buffer cavity is formed between the baking box body and the baking liner, a plurality of vent holes are provided through the side wall of the baking liner, a collection port communicating with the buffer cavity is provided inside the baking box body, and the exhaust pipe is connected to the collection port.

[0011] As a further description of the above technical solution: the collecting port is provided with a conical guide shroud, with its large-diameter end facing the buffer chamber and its small-diameter end connected to the exhaust pipe, for collecting gas and introducing it into the exhaust pipe.

[0012] As a further description of the above technical solution: the exhaust pipe and the intake pipe are arranged parallel to each other inside the housing, and their outer walls are fixed to the inner wall of the housing through heat-conducting ribs to form a heat exchange module.

[0013] As a further description of the above technical solution: the exhaust pipe and the intake pipe are arranged in a continuous S-shaped meandering pattern inside the housing.

[0014] As a further description of the above technical solution: the intake pipe is disposed between the upper and lower layers of the exhaust pipe.

[0015] As a further description of the above technical solution: the exhaust fan is installed at the bottom of the baking oven, and the baking oven has heat dissipation holes corresponding to the exhaust fan.

[0016] This utility model has the following beneficial effects:

[0017] 1. This utility model utilizes an automated control system comprised of a timing unit, a temperature sensor, a first solenoid valve, a second solenoid valve, and an exhaust fan to achieve precise and unmanned operation of the depressurization step during the baking of empty cakes. It completely replaces the traditional, laborious operation that relies on manual experience to open the oven door, avoiding problems such as cake bursting or underbaking caused by inaccurate door opening times, inconsistent durations, or forgotten steps. The device can automatically perform degassing, cooling, and depressurization at the most precise time points according to a preset program, and automatically closes and resumes baking after the temperature drops to a safe set value, ensuring the baking quality of the empty cakes and thus improving the product yield and stability.

[0018] 2. In this invention, by utilizing an exhaust fan to actively ventilate the baking chamber, compared to traditional natural heat dissipation after opening the door, the gas exchange speed is faster, and the time required for depressurization and cooling is shorter, thus shortening the baking interruption window and improving overall production efficiency. More importantly, by placing the exhaust pipe and the intake pipe side by side within the shell and connecting them with heat-conducting fins, a heat exchange function is achieved. When the high-temperature exhaust gas is drawn away, it can effectively preheat the incoming cold external air, reducing energy consumption when restoring the baking temperature, thereby achieving energy saving and consumption reduction. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of an automatic pressure relief device for an empty cake baking box proposed in this utility model.

[0020] Figure 2 This is a schematic diagram of the baking liner of an automatic pressure relief device for an empty cake baking box proposed in this utility model.

[0021] Figure 3 This is a schematic diagram of the conical air guide shroud of an automatic pressure relief device for an empty cake baking box proposed in this utility model.

[0022] Figure 4 This is a schematic diagram of the air inlet pipe section of an automatic pressure relief device for an empty cake baking box proposed in this utility model.

[0023] Figure 5 This is a schematic diagram of the exhaust pipe section of an automatic pressure relief device for an empty cake baking box proposed in this utility model.

[0024] Legend:

[0025] 1. Baking oven body; 2. Oven door; 3. Baking liner; 4. Baking rack; 5. Heating element; 6. Temperature sensor; 7. Timing unit; 8. Buffer chamber; 9. Collection port; 10. Conical air guide; 11. Exhaust pipe; 12. First solenoid valve; 13. Intake pipe; 14. Second solenoid valve; 15. Exhaust fan; 16. Shell; 17. Heat dissipation holes; 18. Vent holes; 19. Heat-conducting fins. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] Reference Figures 1-5 One embodiment of this utility model provides: an automatic pressure relief device for an empty cake baking box, comprising:

[0028] Baking box 1, the interior of baking box 1 is provided with baking liner 3 as the actual baking area, baking box 1 has a door 2 for sealing the baking space connected to the opening of baking liner 3 on one side of the outer wall of baking box 1. Baking liner 3 is provided with heating element 5 as heat source and baking rack 4 for holding the products to be baked.

[0029] It also includes a pressure relief mechanism for automatically performing pressure relief and cooling. The pressure relief mechanism includes: an exhaust pipe 11 that is directly connected to the internal space of the baking liner 3 and is used to exhaust high-temperature gas, and an intake pipe 13 that is connected to the outside ambient air and is used to replenish cold air.

[0030] A first solenoid valve 12 and a second solenoid valve 14 are respectively installed on the exhaust pipe 11 and the intake pipe 13 to precisely control the opening and closing of the channels.

[0031] Its air intake end is connected to the exhaust pipe 11 to provide active suction power and accelerate the gas discharge of the exhaust fan 15;

[0032] In addition, a temperature sensor 6 is installed inside the baking liner 3 to provide real-time feedback on the temperature of the baking zone, and a timing unit 7 is installed outside the baking chamber 1 to accurately record the baking process time; the timing unit 7, the temperature sensor 6, the first solenoid valve 12, the second solenoid valve 14, the exhaust fan 15 and the heating element 5 are electrically connected through a controller to form a closed-loop control system, which automatically coordinates and executes exhaust and pressure relief operations according to the preset time program and temperature threshold parameters.

[0033] Specifically, the baking process is precisely timed by the timing unit 7. When the preset pressure relief time is reached, the system automatically pauses the operation of the heating element 5 and activates the pressure relief mechanism. At this time, the first solenoid valve 12 and the second solenoid valve 14 open simultaneously, and the exhaust fan 15 starts, actively and quickly extracting the high-temperature and high-pressure gas in the baking chamber 3 through the exhaust pipe 11, while simultaneously drawing in outside cold air through the intake pipe 13, achieving rapid gas replacement and cooling. The temperature sensor 6 monitors the temperature inside the chamber in real time during this process. Once the temperature drops to the preset safety value, it immediately triggers a command to close the two solenoid valves and stop the fan, resuming the operation of the heating element 5. The temperature sensor 6 and the timing unit 7 used in this application are existing technologies, and their working principles will not be elaborated further here.

[0034] Reference Figures 1-5 A buffer cavity 8, serving as a gas buffer and distribution area, is formed between the baking chamber 1 and the baking liner 3. Multiple vent holes 18 for evenly discharging gas are provided through the wall of the baking liner 3. A centralized outlet 9, connected to the buffer cavity 8, is located inside the baking chamber 1. The inlet end of the exhaust pipe 11 is connected to this outlet 9. This structure forms an orderly and unobstructed specific airflow channel from the baking liner 3 to the exhaust pipe 11. A conical guide shroud 10 for efficiently collecting airflow is provided below the outlet 9. The conical guide shroud 10, with its converging structure, can collect the gas discharged from the outlet 9 without loss and smoothly guide it into the exhaust pipe 11, avoiding airflow turbulence and leakage. The exhaust pipe 11 and the intake pipe 13 are both integrated inside a housing 16 for constructing a heat exchange system. Multiple heat-conducting ribs 19, which provide heat transfer and support, connect the outer walls of the exhaust pipe 11 and the intake pipe 13. A fixed connection is formed to create a compact counter-current heat exchange unit. To enhance heat exchange, the exhaust pipe 11 and the intake pipe 13 are arranged in a continuous S-shaped meandering pattern inside the housing 16. This design aims to effectively increase the heat exchange path and improve heat exchange efficiency. To optimize the heat exchange layout, the intake pipe 13 is located in the middle of the upper and lower pipes of the exhaust pipe 11, so that the incoming cold air can be surrounded and enveloped by the exhaust hot airflow to the greatest extent to achieve the best heat exchange effect. The exhaust fan 15 is installed at the bottom of the baking chamber 1, which facilitates the stability of the overall structure. The baking chamber 1 is provided with corresponding heat dissipation holes 17 around the exhaust fan 15 for effective air cooling of the fan motor to ensure its long-term stable operation. To ensure the accuracy of control, the detection end of the temperature sensor 6 is specially inserted into the baking liner 3 to ensure that it can directly and in real time monitor the most accurate temperature of the baking area and provide accurate feedback signals to the control system.

[0035] Specifically, the combination of buffer chamber 8, vent 18, and conical guide shroud 10 provides a clear and efficient path for the exhaust of high-temperature gas. Secondly, the exhaust pipe 11 and intake pipe 13, arranged in a continuous S-shape, are integrated into the housing 16 via heat-conducting ribs 19, forming a highly efficient waste heat recovery device. While the exhaust high-temperature gas is drawn away by the exhaust fan 15, its heat is used to preheat the incoming cold air, significantly reducing energy consumption when the equipment returns to baking temperature.

[0036] Working principle: When using this empty cake baking box to make empty cakes, first, place the empty cake to be baked on the baking rack 4 of the baking liner 3, close the door 2, set the total baking time and pressure release trigger time. After the equipment is started, the heating element 5 starts to work and heats up the baking liner 3. At this time, the first solenoid valve 12 and the second solenoid valve 14 are both closed, and the exhaust fan 15 does not work.

[0037] Secondly, when the timing unit 7 reaches the preset first pressure relief time point, the controller will issue a command to pause the heating of the heating element 5. At the same time, the first solenoid valve 12 and the second solenoid valve 14 are automatically opened, the exhaust fan 15 is started, and the exhaust fan 15 generates a strong suction force to quickly draw the high-temperature and high-pressure water vapor and hot air in the baking liner 3 into the exhaust pipe 11 through the vent 18, buffer chamber 8, collection port 9 and conical guide shroud 10. Meanwhile, the ambient temperature air is replenished into the baking chamber 1 through the opened second solenoid valve 14 and the air intake pipe 13.

[0038] Finally, during the exhaust and intake process, the exhaust pipe 11 and intake pipe 13 located in the housing 16 exchange heat through the heat-conducting fins 19. The exhaust hot air preheats the incoming cold air. The temperature sensor 6 installed in the baking liner 3 monitors the internal temperature changes in real time. When the temperature drops rapidly to the preset safe temperature threshold, the temperature sensor 6 will send a signal, and the control system will immediately close the first solenoid valve 12 and the second solenoid valve 14 and stop the operation of the exhaust fan 15. Subsequently, the heating element 5 will restart, and the equipment will return to the normal baking state until the next pressure relief cycle or the end of baking.

[0039] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An automatic pressure relief device for an empty cake baking box, comprising a baking box body (1), wherein a baking liner (3) is provided inside the baking box body (1), a heating element (5) and a support frame (4) are provided inside the baking liner (3), and a door (2) is hinged to one side of the baking box body (1), wherein the door (2) seals the opening of the baking liner (3) when closed, characterized in that, It also includes a pressure relief system, which comprises: The exhaust pipe (11) connected to the baking liner (3) has an exhaust fan (15) connected to its outlet end, and a first solenoid valve (12) is connected in series on the pipe. An air intake pipe (13) connects the external environment to the internal space of the baking liner (3), and a second solenoid valve (14) is connected in series on the pipe. In addition, a temperature sensor (6) is installed inside the baking liner (3) to monitor the baking temperature, a timing unit (7) is installed outside the baking box (1) to record time, and a controller is electrically connected to the timing unit (7), the temperature sensor (6), the first solenoid valve (12), the second solenoid valve (14), the exhaust fan (15) and the heating element (5). The controller is configured to perform the following timing control: when the timing unit (7) reaches the preset pressure relief time point, the power supply to the heating element (5) is cut off, the first solenoid valve (12) and the second solenoid valve (14) are opened, and the exhaust fan (15) is started for ventilation; when the temperature sensor (6) detects a value that drops to a set threshold, the exhaust fan (15) is turned off, the first solenoid valve (12) and the second solenoid valve (14) are turned off, and the heating element (5) is restarted.

2. The automatic pressure relief device for an empty cake baking box according to claim 1, characterized in that: A buffer cavity (8) is formed between the baking box body (1) and the baking liner (3). Multiple ventilation holes (18) are provided through the side wall of the baking liner (3). The interior of the baking box body (1) is provided with a collection port (9) that communicates with the buffer cavity (8). The exhaust pipe (11) is connected to the collection port (9).

3. The automatic pressure relief device for an empty cake baking box according to claim 2, characterized in that: The collecting port (9) is provided with a conical guide shroud (10), with its large-diameter end facing the buffer chamber (8) and its small-diameter end connected to the exhaust pipe (11), for collecting gas and introducing it into the exhaust pipe (11).

4. The automatic pressure relief device for an empty cake baking box according to claim 1, characterized in that: The exhaust pipe (11) and the intake pipe (13) are arranged in parallel inside the housing (16), and their outer walls are fixed to the inner wall of the housing (16) by heat-conducting ribs (19) to form a heat exchange module.

5. An automatic pressure relief device for an empty cake baking box according to claim 4, characterized in that: The exhaust pipe (11) and the intake pipe (13) are arranged in a continuous S-shaped meandering pattern inside the housing (16).

6. An automatic pressure relief device for an empty cake baking box according to claim 4, characterized in that: The intake pipe (13) is located between the upper and lower layers of the exhaust pipe (11).

7. An automatic pressure relief device for an empty cake baking box according to claim 1, characterized in that: The exhaust fan (15) is installed at the bottom of the baking box (1), and the baking box (1) has heat dissipation holes (17) corresponding to the exhaust fan (15).

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