A spiral quick freezer anti-cold-running water blowing device and a control method thereof

Abstract

The application belongs to the technical field of refrigeration machinery, and particularly relates to a spiral quick freezer anti-cold-leakage water blowing device and a control method thereof. The existing spiral quick freezer anti-cold-leakage structure has poor anti-cold-leakage effect. The spiral quick freezer anti-cold-leakage water blowing device is arranged in a cold storage, the cold storage comprises a feeding port, a storage body and a discharging port which are sequentially connected, a conveying assembly is arranged in the cold storage, and the conveying assembly sequentially passes through the feeding port, the storage body and the discharging port. A first air duct is arranged outside the feeding port, a second air duct is arranged outside the discharging port, the first air duct is communicated with a air supply assembly, the second air duct is communicated with the air supply assembly, a plurality of first air supply ports are arranged on the first air duct, a plurality of second air supply ports are arranged on the second air duct, the first air supply ports and the second air supply ports are oppositely arranged relative to the conveying assembly, and air of the first air supply ports and air of the second air supply ports are blown to the conveying assembly to form an air curtain. The air curtain temperature, humidity and air volume are automatically adjusted.

Description

Technical Field

[0001] This application belongs to the field of refrigeration machinery technology, and in particular relates to a device for preventing cold water leakage in a spiral quick-freezing machine and its control method. Background Technology

[0002] A spiral freezer is a large-scale freezing equipment mainly used for freezing fish and other aquatic products. Fish are fed into the freezer via a conveyor belt, and after freezing, they are discharged via the same conveyor belt. To prevent friction between the conveyor belt and the freezer structure, a certain gap is left at the bottom of the conveyor belt at the inlet and outlet; however, a larger gap is required at the top of the conveyor belt to prevent friction between the fish and the freezer structure.

[0003] Since the temperature inside the freezer is typically -40℃ to -50℃, while the ambient temperature is around 20℃, this significant temperature difference results in substantial loss of cold air at the inlet and outlet. This cold air loss from the inlet and outlet places an additional heat load on the spiral freezer, causing temperature fluctuations within the freezer. The wasted cold air used to cool the fish also contributes to the system's low cooling efficiency. Simultaneously, the inflow of high-humidity outside air through the inlet and outlet increases the water vapor content inside the freezer. When this humid air flows through the evaporator, it accelerates surface frost formation. Once the frost reaches a certain level, the refrigeration system's energy efficiency drops significantly.

[0004] Therefore, setting up anti-cold-leakage structures at the inlet and outlet to reduce heat and mass transfer between the outside air and the air inside the storage can effectively improve the stability of temperature and humidity maintenance inside the storage.

[0005] Furthermore, in actual production, fish may carry a significant amount of moisture when entering the storage tank. This moisture significantly increases the water vapor content, causing frost to form on the evaporator. Simultaneously, the moisture on the fish's surface freezes rapidly, forming a thick ice layer that obstructs internal cooling, preventing the core temperature from dropping to -18°C and resulting in substandard quality of the quick-frozen product. Excessive freezing can also cause the fish to stick to the conveyor belt. To address these issues, a water-blowing nozzle is installed in the anti-cold-leakage structure at the feed inlet to effectively control the amount of water carried by the fish, preventing both excessive moisture leading to freezing and insufficient moisture causing dehydration.

[0006] The existing anti-cold-leakage structure of spiral quick-freezing machines has low reliability and poor anti-cold-leakage effect. Summary of the Invention

[0007] 1. Technical problems to be solved

[0008] In view of the problems of low reliability and poor cold leakage prevention effect of the existing anti-cold leakage structure of spiral quick-freezing machine, this application provides a cold leakage prevention water blowing device and its control method for spiral quick-freezing machine.

[0009] 2. Technical Solution

[0010] To achieve the above objectives, this application provides a cold water blowing device for preventing cold water leakage in a spiral quick-freezing machine. The device is installed inside a cold storage room, which includes a feed inlet, a storage body, and a discharge outlet connected in sequence. A conveying assembly is installed inside the cold storage room, passing sequentially through the feed inlet, the storage body, and the discharge outlet. A first air duct is provided outside the feed inlet, and a second air duct is provided outside the discharge outlet. The first air duct is connected to an air supply assembly, and the second air duct is connected to the air supply assembly. A plurality of first air outlets are provided on the first air duct, and a plurality of second air outlets are provided on the second air duct. The first air outlets and the second air outlets are positioned opposite each other. Air from the first air outlets blows towards the conveying assembly to form an air curtain, and air from the second air outlets blows towards the conveying assembly to form an air curtain.

[0011] Another embodiment provided in this application is as follows: the air supply assembly includes a motor, a fan, a surface cooler and an electric heater connected in sequence, the electric heater is connected to the first air duct and the electric heater is connected to the second air duct.

[0012] Another embodiment provided in this application is as follows: the first air duct includes a first air inlet, the second air duct includes a second air inlet, the electric heater is connected to the first air inlet, and the electric heater is connected to the second air inlet.

[0013] Another embodiment provided in this application is as follows: a temperature and humidity sensor is provided in the first air inlet, and the temperature and humidity sensor is provided in the second air inlet. The temperature and humidity sensor is used to collect the temperature and humidity of the supplied air. The temperature and humidity sensor is connected to the controller, the electric heater is connected to the controller, and the surface cooler is connected to the controller.

[0014] Another embodiment provided by this application is as follows: The first air duct includes an upper air duct, a first side air duct, a lower air duct, and a second side air duct that are connected in sequence. The upper air duct and the lower air duct are connected through a connecting port. An air outlet is provided at the end of the first side air duct and at the end of the second side air duct. A return air outlet is provided on the first side air duct and on the second side air duct. The first air supply outlet includes an upper air supply outlet and a lower air supply outlet. The upper air supply outlet is provided on the upper air duct and the lower air supply outlet is provided on the lower air duct. The upper air supply outlet is disposed opposite to one side of the conveying component, and the lower air supply outlet is disposed opposite to the other side of the conveying component.

[0015] Another embodiment provided in this application is: the upper air outlet and the lower air outlet are arranged alternately to form a multi-layered air curtain labyrinth in the axial direction.

[0016] Another embodiment provided in this application is: the first air outlet is a long and narrow slit, and the second air outlet is a long and narrow slit, used to form a high-speed airflow perpendicular to the conveyor belt.

[0017] Another embodiment provided in this application is: the upper air outlet includes an inclined air outlet, the inclined air outlet is disposed at the end of the upper air duct, and the air curtain formed by the inclined air outlet has an angle with the conveying component.

[0018] This application also provides a control method for the anti-cold water blowing device of the spiral quick-freezing machine, comprising the following steps: after the spiral quick-freezing machine is started, the air curtain automatically opens and initially operates according to the default parameters; after inputting the feeding speed m, the air curtain reads the ambient temperature Tou and the temperature Tin inside the silo, and sets the air curtain parameters according to the ambient temperature Tou and the temperature Tin inside the silo, and the air curtain parameters are automatically adjusted in real time according to the ambient temperature Tou and the temperature Tin inside the silo.

[0019] Another implementation method provided in this application is as follows: The real-time automatic adjustment includes calculating the required air curtain temperature T, air curtain humidity H, and air curtain velocity v based on the ambient temperature Tout and the temperature Tin inside the freezer. The air curtain temperature T, humidity H, and velocity v are then used as set values ​​to begin automatic parameter adjustment. After all measured values ​​reach the set values, the ambient temperature Tout and the temperature Tin inside the freezer are periodically read and compared with the previous temperature value to determine if there has been a change. If there is no change, the air curtain continues to operate with the existing parameters. If the temperature changes, it may be due to a change in operating conditions or the freezer being shut down, so the system continues to determine whether the freezer is shut down. If the freezer is shut down, the air curtain system is turned off. If the freezer is not shut down, the ambient temperature Tout and the temperature Tin inside the freezer are read again, and the required air curtain temperature T, humidity H, and velocity v are calculated based on the new temperature parameters, initiating a new round of automatic parameter adjustment.

[0020] 3. Beneficial effects

[0021] Compared with the prior art, the beneficial effects of the anti-cold water blowing device and its control method for spiral quick-freezing machines provided in this application are as follows:

[0022] The anti-cold-leakage water blowing device for spiral quick-freezing machines provided in this application is an anti-cold-leakage water blowing device for spiral quick-freezing machines. By adding a water blowing function to the anti-cold-leakage device, the purpose of preventing cold leakage and blowing water can be achieved simultaneously through the same device.

[0023] The anti-cold water blowing device for the spiral quick-freezing machine provided in this application adopts a multi-layer air curtain labyrinth structure. This non-contact sealing can effectively avoid friction problems; the multi-layer labyrinth arrangement can minimize cold loss.

[0024] The anti-cold water blowing device for the spiral freezer provided in this application has an open circulation system in which the air curtain can automatically adjust the temperature, humidity and air volume of the air curtain to match the operating status of the spiral freezer.

[0025] The spiral quick-freezing machine anti-cold-running water blowing device provided in this application has a high-speed air outlet at the top of the feed inlet to blow water, control the moisture carried on the surface of the fish, prevent surface freezing and conveyor belt sticking, and help maintain stable temperature and humidity in the storage.

[0026] The anti-cold water blowing device for the spiral quick-freezing machine provided in this application has a non-contact sealing air curtain, which effectively avoids the friction problem of solid seals and will not affect the conveyor belt and fish, thus having high reliability. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the anti-cold water blowing device for the spiral quick-freezing machine of this application;

[0028] Figure 2 This is a partial structural schematic diagram of the anti-cold water blowing device for the spiral quick-freezing machine of this application;

[0029] Figure 3 This is a schematic diagram of the air curtain control method of this application. Detailed Implementation

[0030] In the following, specific embodiments of this application will be described in detail with reference to the accompanying drawings. Based on these detailed descriptions, those skilled in the art will be able to clearly understand and implement this application. Without departing from the principles of this application, features from various embodiments can be combined to obtain new implementations, or certain features from some embodiments can be substituted to obtain other preferred implementations.

[0031] See Figures 1-3 This application provides a cold water blowing device to prevent cold water leakage in a spiral quick-freezing machine. The device is installed inside a cold storage room, which includes a feed inlet, a storage body 8, and a discharge outlet connected in sequence. A conveying component 7 is installed inside the cold storage room, passing through the feed inlet, the storage body 8, and the discharge outlet in sequence. A first air duct 1 is provided outside the feed inlet, and a second air duct 6 is provided outside the discharge outlet. The first air duct 1 is connected to an air supply component, and the second air duct 6 is connected to the air supply component. A plurality of first air outlets are provided on the first air duct 1, and a plurality of second air outlets are provided on the second air duct 6. The first air outlets are positioned opposite to the conveying component 7, and the second air outlets are positioned opposite to the conveying component 7. The air from the first air outlets blows towards the conveying component 7 to form an air curtain, and the air from the second air outlets blows towards the conveying component 7 to form an air curtain.

[0032] The conveyor component 7 here is a conveyor belt.

[0033] After the air from the air supply component enters the first air duct 1 or the second air duct 6, it flows inside the air duct. Since there are air outlets on the air duct, the air blows through the air outlets to the conveyor belt to form an air curtain, which blows the items on the conveyor belt. Since the items are wet, the water is blown away.

[0034] Furthermore, the air supply assembly includes a motor 2, a fan 3, a surface cooler 4, and an electric heater 5 connected in sequence. The electric heater 5 is connected to the first air duct 1, and the electric heater 5 is connected to the second air duct 6. The motor 2 drives the fan 3 to operate, drawing in air from the outside and sending it into the surface cooler 4. The frequency of the motor 5 is continuously adjustable, thereby controlling the speed of the fan 4 to be continuously adjustable, and thus controlling the airflow speed at the air outlet by adjusting the motor frequency. The air delivered by the fan 3 enters the surface cooler 4 for cooling and dehumidification, and the dehumidified air is then sent to the electric heater 5. The surface temperature of the surface cooler 3 is continuously controllable, and the surface temperature is adjusted according to the humidity of the supplied air. The air cooled and dehumidified by the surface cooler 4 flows through the electric heater 5, and the air temperature rises back to the set temperature. One path is sent into the first air duct 1 through a pipe, and the other path is sent into the second air duct 6 through a pipe. The input power of the electric heater 5 is continuously adjustable, and the input power is adjusted according to the supplied air temperature.

[0035] Furthermore, the first air duct 1 includes a first air inlet 101, the second air duct 6 includes a second air inlet, the electric heater 5 is connected to the first air inlet 101, and the electric heater 5 is connected to the second air inlet.

[0036] Furthermore, a temperature and humidity sensor is installed inside the first air inlet 101 and the second air inlet. The temperature and humidity sensor is used to collect the temperature and humidity of the supplied air. The temperature and humidity sensor is connected to the controller, and the electric heater 5 is connected to the controller.

[0037] Further, the first air duct 1 includes an upper air duct 103, a first side air duct 109, a lower air duct 105, and a second side air duct connected in sequence. The upper air duct 103 and the lower air duct 105 are connected through a connecting port 104. An air outlet 110 is provided at the end of the first side air duct 109 and the end of the second side air duct. A return air inlet is provided on the first side air duct 109 and the second side air duct. The first air supply outlet includes an upper air supply outlet 102 and a lower air supply outlet 106. The upper air supply outlet 102 is provided on the upper air duct 103 and the lower air supply outlet 106 is provided on the lower air duct 105. The upper air supply outlet 102 is disposed opposite to one side of the conveying component 7, and the lower air supply outlet 106 is disposed opposite to the other side of the conveying component 7.

[0038] Temperature and humidity controlled air enters the air duct 1 through the air inlet 101, flows along the upper air duct 103 to the upper and lower air duct connection 104, and then enters the lower air duct 105. Multiple upper air outlets 102 are provided in the upper air duct 103 to form an air curtain above the conveyor belt. An upper return air outlet 107 is provided on the side and connects to the side air duct 109 for the return air of the upper air curtain. Multiple lower air outlets 106 are provided in the lower air duct 105 to form an air curtain below the conveyor belt. A lower return air outlet 108 is provided on the side and connects to the side air duct 109 for the return air of the lower air curtain. The return air from the upper return air outlet 107 and the lower return air outlet 108 flows out along the side air duct 109. An air outlet 110 is provided at the end of the side air duct 109.

[0039] Furthermore, the upper air outlet 102 and the lower air outlet 106 are arranged alternately to form a multi-layered air curtain labyrinth in the axial direction. The feed inlet air duct 1 has multiple upper air outlets 102 and lower air outlets 106, with each outlet being a narrow, elongated slit. These outlets are arranged alternately to form a multi-layered air curtain labyrinth in the axial direction. The air within the upper air duct 103, lower air duct 105, and side air duct 109 surrounds the feed inlet air duct 1, forming an air insulation layer in the radial direction. The axial and radial cold air blockage works together to achieve optimal cold loss prevention.

[0040] Furthermore, the first air outlet is a long, narrow slit, and the second air outlet is a long, narrow slit.

[0041] Furthermore, the upper air outlet includes an inclined air outlet, which is disposed at the end of the upper air duct, and the air curtain formed by the inclined air outlet has an angle with the conveying component.

[0042] The air outlet closest to the air inlet 101 in the upper air outlet 102 has a certain angle with the vertical direction. This air outlet serves as a water blowing outlet, with a high wind speed and low humidity. It is used to blow away the moisture carried on the surface of the fish and reduce the wet film content on the surface of the fish.

[0043] This application also provides a control method for the anti-cold water blowing device of the spiral quick-freezing machine, including the following steps: S101: After the spiral quick-freezing machine is turned on, the air curtain system is automatically turned on and initially operates according to the default parameters.

[0044] S102: After the operator inputs the feeding speed m, the air curtain system begins to read the ambient temperature Tout and the temperature Tin inside the silo.

[0045] S103: Calculate and set the required air curtain temperature T, air curtain humidity H, and air curtain velocity v based on three parameters: feeding speed m, ambient temperature Tout, and silo temperature Tin.

[0046] To prevent icing during the water blowing process, the air curtain temperature should be higher than 0℃. Take T = max{0℃, kTout + (1-k)Tin}, and optionally, take parameter k = 0.5.

[0047] To carry as much moisture as possible, the humidity of the air curtain should be as low as possible; alternatively, H = 10%.

[0048] The air curtain velocity is calculated based on the conservation of water mass. Assuming that the air curtain reaches saturation after passing over the fish's body surface, and that the water vapor content carried by the air curtain accounts for 'a' of the water content on the fish's body surface, we can choose to take a = 0.8. Then, v = am / (Sρd), where a is the proportion of water carried by the air curtain to the water content on the fish's body surface, m is the feeding velocity, S is the total area of ​​the air duct outlet, ρ is the air density, and d is the saturated moisture content corresponding to temperature T.

[0049] The system will automatically adjust the parameters according to the above settings, in the order of wind speed, humidity, and temperature of the air curtain.

[0050] S104: For air curtain speed, the motor frequency is adjusted according to the deviation between the measured value vc and the set value v, thereby changing the fan speed and achieving the purpose of adjusting the air supply speed.

[0051] For air curtain humidity, the surface temperature of the surface cooler is adjusted according to the deviation between the measured value Hc and the set value H, thereby changing the amount of water vapor condensed when passing through the surface cooler, and thus achieving the purpose of regulating the supply air humidity.

[0052] For air curtain temperature, the input power of the electric heater is adjusted according to the deviation between the measured value Tc and the set value T, so as to regulate the supply air temperature.

[0053] The adjustment and control are based on the following formula:

[0054]

[0055] In the formula: a, b, c are set parameters, which can be selected as a = 5.0, b = 2.0, c = 12.0. Different values ​​can be selected for the parameters when controlling the temperature, humidity, and wind speed of the air curtain; e(t) is the deviation between the set value and the measured value of the control quantity, and u(t) is the adjustment value of the output quantity. For air curtain temperature control, e(t) = T - Tc, u(t) is the adjustment amount of the electric heater power; for air curtain humidity control, e(t) = H - Hc, u(t) is the adjustment amount of the surface cooler temperature; for air curtain wind speed control, e(t) = v - vc, u(t) is the adjustment amount of the motor frequency.

[0056] S105: When the measured values ​​of wind speed, humidity and temperature of the air curtain all reach the set values, the ambient temperature Tout and the temperature inside the air chamber Tin are read periodically and compared with the temperature values ​​of the previous moment to determine whether there is a change. If there is no change, the air curtain system maintains the existing parameters and continues to operate, repeating S105; if there is a change, proceed to S106.

[0057] S106: Determine if the freezer is off. If the freezer is off, shut down the air curtain system and end the control. If the freezer is not off, proceed to S103, reread the ambient temperature Tout and the temperature Tin inside the freezer, calculate the required air curtain temperature T, humidity H, and wind speed v based on the new temperature parameters, and start a new round of automatic parameter adjustment.

[0058] Example

[0059] The first air duct 1 and the second air duct 6 are installed on the silo body 8. The conveyor belt extends from the inside of the silo body 8 to the outside. The motor 2 drives the fan 3 to operate. The air volume and the outlet air speed can be controlled by adjusting the fan speed. The air first passes through the surface cooler 4 to reduce the temperature below the dew point to remove some water vapor. Then it passes through the electric heater 5 to raise the temperature. The temperature and humidity of the air are regulated by controlling the temperature of the surface cooler 4 and the power of the electric heater 5. Then it is sent into the feed inlet air duct 1 and the discharge outlet air duct 6, forming a multi-layered air curtain labyrinth through the air duct outlet.

[0060] Temperature and humidity controlled air enters the air duct 1 through the air inlet 101, flows along the upper air duct 103 to the upper and lower air duct connection 104, and then enters the lower air duct 105. Multiple upper air outlets 102 are provided in the upper air duct 103 to form an air curtain above the conveyor belt. An upper return air outlet 107 is provided on the side and connects to the side air duct 109 for the return air of the upper air curtain. Multiple lower air outlets 106 are provided in the lower air duct 105 to form an air curtain below the conveyor belt. A lower return air outlet 108 is provided on the side and connects to the side air duct 109 for the return air of the lower air curtain. The return air from the upper return air outlet 107 and the lower return air outlet 108 flows out along the side air duct 109. An air outlet 110 is provided at the end of the side air duct 109. The air in the upper air duct 103, lower air duct 105, and side air duct 109 acts as a heat insulation layer, effectively reducing radial cooling loss; the upper air supply outlet 102, lower air supply outlet 106, upper return air outlet 107, and lower return air outlet 108 form an alternating multi-layered air curtain, effectively reducing axial cooling loss.

[0061] The arrangement of the multi-layered air curtain labyrinth minimizes axial cold leakage; the flow path is set in the interlayer of the air duct, and the low thermal conductivity of air is used to form an insulation layer, which reduces radial cold leakage. This forms both axial and radial cold blockage, achieving the best anti-cold leakage effect.

[0062] The air curtain control employs an independent open-loop circulation system, which automatically adjusts the air curtain's temperature, humidity, and airflow according to the control strategy, synchronously matching the operating status of the spiral freezer and adapting to different feed rates and heat loads. Controlling the air curtain temperature between the freezer temperature and ambient temperature effectively reduces cold loss at the inlet and outlet, while pre-cooling the fish. Controlling the air curtain humidity between the freezer humidity and ambient humidity removes excess moisture from the fish surface, preventing dehydration due to insufficient moisture and preventing condensation of humid air near the inlet and outlet. Controlling the air curtain speed creates an effective jet, ensuring its airtightness. When the feed rate increases or the temperature difference between inside and outside the freezer widens, the air curtain speed automatically increases to enhance insulation.

[0063] A high-speed air vent is installed at the top of the feed inlet to blow water, control the moisture carried on the surface of the fish, prevent surface freezing and conveyor belt sticking, and at the same time help maintain stable temperature and humidity inside the storage.

[0064] The anti-cold water blowing device for spiral quick-freezing machines described in this application can be widely used in frozen products; the fish mentioned here is just an example.

[0065] Although this application has been described above with reference to specific embodiments, those skilled in the art will understand that many modifications can be made to the configurations and details disclosed in this application within the principles and scope of the disclosure. The scope of protection of this application is determined by the appended claims, and the claims are intended to cover all modifications included in the literal meaning or scope of equivalents of the technical features in the claims.

Claims

1. A cold water leakage prevention device for a spiral quick-freezing machine, wherein the cold water leakage prevention device is installed inside a cold storage, characterized in that: The cold storage includes a feed inlet, a storage body, and a discharge outlet connected in sequence. A conveying assembly is installed inside the cold storage, passing through the feed inlet, the storage body, and the discharge outlet in sequence. A first air duct is provided outside the feed inlet, and a second air duct is provided outside the discharge outlet. The first air duct is connected to an air supply assembly, and the second air duct is connected to the air supply assembly. A plurality of first air outlets are provided on the first air duct, and a plurality of second air outlets are provided on the second air duct. The first air outlets are positioned opposite to the conveying assembly, and the second air outlets are positioned opposite to the conveying assembly. The air from the first air outlets blows toward the conveying assembly to form an air curtain, and the air from the second air outlets blows toward the conveying assembly to form an air curtain. The first air duct includes an upper air duct, a first side air duct, a lower air duct, and a second side air duct that are connected in sequence. The upper air duct and the lower air duct are connected by a connecting port. An air outlet is provided at the end of the first side air duct and at the end of the second side air duct. A return air inlet is provided on the first side air duct and the second side air duct. The first air supply outlet includes an upper air supply outlet and a lower air supply outlet. The upper air supply outlet is provided on the upper air duct and the lower air supply outlet is provided on the lower air duct. The upper air supply outlet is disposed opposite to one side of the conveying component, and the lower air supply outlet is disposed opposite to the other side of the conveying component.

2. The anti-cold water blowing device for a spiral quick-freezing machine as described in claim 1, characterized in that: The air supply assembly includes a motor, a fan, a surface cooler, and an electric heater connected in sequence. The electric heater is connected to the first air duct and the electric heater is connected to the second air duct.

3. The anti-cold water blowing device for a spiral quick-freezing machine as described in claim 2, characterized in that: The first air duct includes a first air inlet, the second air duct includes a second air inlet, the electric heater is connected to the first air inlet, and the electric heater is connected to the second air inlet.

4. The anti-cold water blowing device for a spiral quick-freezing machine as described in claim 3, characterized in that: A temperature and humidity sensor is installed in the first air inlet and the second air inlet. The temperature and humidity sensor is used to collect the temperature and humidity of the supplied air. The temperature and humidity sensor is connected to the controller. The electric heater is connected to the controller. The surface cooler is connected to the controller.

5. The anti-cold water blowing device for a spiral quick-freezing machine as described in claim 1, characterized in that: The upper and lower air outlets are arranged alternately to form a multi-layered air curtain labyrinth in the axial direction.

6. The anti-cold water blowing device for a spiral quick-freezing machine as described in claim 5, characterized in that: The first air outlet is a long, narrow slit, and the second air outlet is a long, narrow slit, used to form a high-speed airflow perpendicular to the conveyor belt.

7. The anti-cold water blowing device for a spiral quick-freezing machine as described in claim 5, characterized in that: The upper air outlet includes an inclined air outlet, which is located at the end of the upper air duct, and the air curtain formed by the inclined air outlet has an angle with the conveying component.

8. A control method for the anti-cold water blowing device of the spiral quick-freezing machine according to any one of claims 1 to 7, characterized in that: The process includes the following steps: After the spiral quick-freezing machine is turned on, the air curtain automatically opens and initially operates according to the default parameters; after inputting the feeding speed m, the air curtain reads the ambient temperature Tou and the temperature Tin inside the refrigeration chamber, sets the air curtain parameters according to the ambient temperature Tou and the temperature Tin inside the refrigeration chamber, and the air curtain parameters are automatically adjusted in real time according to the ambient temperature Tou and the temperature Tin inside the refrigeration chamber.

9. The control method for the anti-cold water blowing device of the spiral quick-freezing machine as described in claim 8, characterized in that: The real-time automatic adjustment includes calculating the required air curtain temperature T, air curtain humidity H, and air curtain velocity v based on the ambient temperature Tout and the temperature Tin inside the freezer. The air curtain temperature T, humidity H, and velocity v are then used as set values ​​to begin automatic parameter adjustment. After all measured values ​​reach the set values, the ambient temperature Tout and the freezer temperature Tin are periodically read and compared with the previous temperature value to determine if there has been a change. If there is no change, the air curtain continues to operate with the existing parameters. If the temperature changes, it may indicate a change in operating conditions or shutdown of the freezer, thus requiring further assessment of whether the freezer is shut down. If the freezer is shut down, the air curtain system is turned off. If the freezer is not shut down, the ambient temperature Tout and the freezer temperature Tin are read again, and the required air curtain temperature T, humidity H, and velocity v are calculated based on the new temperature parameters, initiating a new round of automatic parameter adjustment.

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