Method for operating a cold store regulating double air curtain system

Abstract

The application discloses a kind of cold storage regulating double air curtain system operation method, operation method is in the first temperature probe, second temperature probe and third temperature probe respectively corresponding setting in refrigeration room, back cage and through hall, the blowing angle is determined by temperature difference, according to the height H and width L2 of the goods obtained from the warehouse by infrared sensor determine the blowing height and air supply speed of first air supply port, second air supply port.The application obtains the heat exchange energy caused by temperature probe acquisition temperature difference and air flow, ensure the start condition of circulating fan;Based on the width and height of the goods obtained from the warehouse by infrared sensor, according to the width and height of the goods obtained from the warehouse, the blowing height, blowing angle and blowing speed are flexibly adjusted, the heat exchange between back cage, refrigeration room and back cage, through hall is maximally reduced, and then the loss amount of refrigeration room cold in the process of entering the warehouse is reduced, the energy utilization efficiency of cold storage is improved.

Description

Technical Field

[0001] This invention relates to the field of cold storage, and in particular to a method for operating a cold storage adjustable double air curtain system. Background Technology

[0002] Large cold storage facilities typically experience frequent loading and unloading of goods. The temperature difference between the refrigerated compartments and the passageways is generally over 20 degrees Celsius. To reduce heat exchange between these compartments during loading and unloading, a cooling room is usually installed inside the cold storage facility. This cooling room is connected to the refrigerated compartments by a door, and another door connects it to the passageways. One or more air curtain machines are installed at each door, forming an air curtain to block heat exchange between the refrigerated compartments and the outside environment. However, existing air curtain systems only offer automatic start / stop control and cannot automatically adjust airflow speed, height, and angle, thus affecting insulation effectiveness. Summary of the Invention

[0003] In view of this, the present invention proposes an operation method for a cold storage adjustable double air curtain system.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] The operating method of the cold storage adjustable double air curtain system of the present invention is as follows: a first temperature probe, a second temperature probe, and a third temperature probe are respectively installed in the cold storage room, the refrigeration room, and the passageway. The signal output terminals of the first temperature probe, the second temperature probe, and the third temperature probe are connected to the signal input terminal of the controller. The controller processes the received temperature signals and calculates the temperature values ​​of the cold storage room, the refrigeration room, and the passageway, which are denoted as T1, T2, and T3, respectively.

[0006] The opening and closing status of the two warehouse doors is monitored by the position switch on the return room. When the two warehouse doors are open, there is heat exchange between the cold storage room and the return room, and between the return room and the passageway. The heat exchange energy caused by the opening of the warehouse doors is calculated based on the temperature values ​​T1, T2 and T3. The heat exchange energy between the cold storage room and the return room is W1, and the heat exchange energy between the return room and the passageway is W2. If W1 + W2 ≥ the rated energy consumption W3 of the circulating fan, the circulating fan is started. If W1 + W2 < W3, the circulating fan is not started.

[0007] The air outlet corresponding to the door between the recycling room and the cold storage room is designated as the first air outlet, and the air outlet corresponding to the door between the recycling room and the passageway is designated as the second air outlet. The air supply angles θ1 and θ2 of the first and second air outlets respectively satisfy the following formulas: θ1 = 80 + K1(T2 - T1), θ2 = 80 + K1(T3 - T2); K1 in both formulas is the air supply angle coefficient, which takes a value of 0.5 to 0.8.

[0008] The height H and width L2 of the outgoing goods are acquired using a first infrared sensor and transmitted to the controller. The controller determines the blowing height of the first and second air outlets based on the height H of the outgoing goods; and determines the airflow velocity of each air outlet based on the width L1 of the return storage area and the width L2 of the outgoing goods.

[0009] V = V 1 + K 2 (L1-L2) / 2;

[0010] In the formula, V 1 The wind speed at the maximum width of the outbound goods is taken as 2.5m / s to 3.0m / s; L1 is the width of the return storage area; L2 is the width of the outbound goods. K 2 The wind speed coefficient is 1 m / s to 1.5 m / s.

[0011] The beneficial effects are: This invention uses a temperature probe to obtain the heat exchange energy caused by temperature difference and air flow, ensuring the start-up of the circulating fan; it uses an infrared sensor to obtain the width and height of the outgoing goods, and flexibly adjusts the air supply height, air supply angle and air supply speed according to the width and height of the outgoing goods, minimizing the heat exchange between the return room and the cold storage room, and between the return room and the passageway, thereby reducing the loss of cold air in the cold storage room during the process of entering the cold storage and improving the energy utilization efficiency of the cold storage.

[0012] Preferably, there are three or more first and second air outlets from bottom to top. In actual operation, due to the different heights of the air outlets, the air curtain height can be divided into multiple levels. Taking three first air outlets as an example: when the height of the outgoing goods is within 1.4m, the lowest first air outlet is opened sequentially; when the height of the outgoing goods is between 1.4m and 1.8m, the two lower first air outlets are opened; when the height of the outgoing goods is greater than 1.8m, all three first air outlets can be opened to ensure the air insulation effect. Attached Figure Description

[0013] Figure 1 This is a diagram showing the positional relationship between the cold storage room, the reheating room, and the passageway in this invention. Detailed Implementation

[0014] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. These embodiments are implemented based on the technical solution of the present invention, and detailed implementation methods and specific operation processes are given. However, the scope of protection of the present invention is not limited to the following embodiments.

[0015] It should be noted that, in the description of this invention, relational terms such as “first” and “second” are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0016] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected" and "linked" 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 connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0017] like Figure 1 As shown, this invention proposes an operation method for a cold storage adjustable double air curtain system. This method involves installing a first temperature probe 4, a second temperature probe 5, and a third temperature probe 6 in the cold storage room 1, the return room 2, and the passageway 3, respectively. The signal output terminals of the first temperature probe 4, the second temperature probe 5, and the third temperature probe 6 are connected to the signal input terminal of a controller. The controller processes the received temperature signals to calculate the temperature values ​​of the cold storage room 1, the return room 2, and the passageway 3, denoted as T1, T2, and T3, respectively.

[0018] The opening and closing status of the two storage doors is monitored by the position switch on the return storage room 2. When the two storage doors open one after the other, heat exchange occurs between the cold storage room 1 and the return storage room 2, and between the return storage room 2 and the passageway 3. The heat exchange energy caused by the opening of the storage doors is calculated based on the temperature values ​​T1, T2, and T3. The storage door between the cold storage room 1 and the return storage room 2 is called the inner storage door, and the storage door between the return storage room and the passageway is called the outer storage door. The heat exchange energy between the cold storage room 1 and the return storage room 2 is W1, and the heat exchange energy between the return storage room 2 and the passageway 3 is W2. The calculation formula is as follows:

[0019] W1= K 3 ×S1×(T2-T1)×t1, where S1 is the area of ​​the doorway corresponding to the inner warehouse door. t 1 This refers to the opening time of the inner vault door, which is generally controlled within 10 to 20 seconds. K 3 The air heat exchange coefficient is taken as 1 / 3;

[0020] W2= K 3 ×S2×(T3-T2)× t 2 S2 is the area of ​​the doorway corresponding to the outer warehouse door. t2 This refers to the opening time of the outer warehouse door, which is generally controlled within 10 to 20 seconds. K 3 The air heat exchange coefficient is taken as 1 / 3;

[0021] The change in heat exchange energy caused by entering the warehouse is compared with the rated energy consumption (i.e., W3) of the circulating fan 7. If W1 + W2 ≥ the rated energy consumption W3 of the circulating fan, the circulating fan 7 is started to form an air curtain by blowing air through the circulating fan 7; if W1 + W2 < W3, the circulating fan 7 is not started.

[0022] The air outlets corresponding to the inner warehouse door are designated as the first air outlet 8. There are three first air outlets 8 from top to bottom, and each first air outlet 8 has a first valve 9. The air outlets corresponding to the outer warehouse door are designated as the second air outlets 10. There are three second air outlets 10 from top to bottom, and each second air outlet 10 has a second valve 11. The air supply direction of the first air outlets 8 and the second air outlets 10 can be adjusted by an electric actuator. The control input terminal of the electric actuator is connected to the control output terminal of the controller. The controller controls the air supply direction of the first air outlets 8 and the second air outlets 10, where the air supply angle θ1 of the first air outlet is 80° + 10°. K 1 (T2-T1), the air supply angle of the second air outlet θ2=80+ K 1 (T3-T2), K 1 This is the air supply angle coefficient, with a value ranging from 0.5 to 0.8;

[0023] The first infrared sensor 12 acquires the height H and width L2 of the outgoing goods and transmits this information to the controller. The controller determines the blowing height of the first and second air outlets based on the height H of the outgoing goods; and determines the airflow speed of each air outlet based on the width L1 of the return storage area and the width L2 of the outgoing goods.

[0024] V = V 1 + K 2 (L1-L2) / 2;

[0025] In the formula, V 1 The wind speed at the maximum width of the outbound goods is taken as 2.5m / s to 3.0m / s; L1 is the width of the return storage area; L2 is the width of the outbound goods. K 2 This is the wind speed coefficient, with a value ranging from 1 m / s to 1.5 m / s;

[0026] The second infrared sensor 13 is used to scan the outbound goods. After the outbound goods have completely passed through the outer warehouse door, the air supply speed of the second air outlet is adjusted to the lowest speed. After the outer warehouse door is closed, the circulating fan is turned off.

[0027] It should be noted that the present invention is based on Figure 1 The left and right directions are the width directions. The width L1 of the return room is usually greater than the maximum width of the outbound goods, so as to realize the sequential opening of the inner and outer warehouse doors during the inbound and outbound process and avoid simultaneous opening. The maximum width of the outbound goods refers to the total width of the outbound goods, and the width L2 of the outbound goods refers to the width of the part of the outbound goods located in the return room during the outbound process.

[0028] Similarly, upon receiving goods, it is first determined whether to start the circulating fan 7; the height H and width L2 of the goods to be received are obtained using the second infrared sensor 13 and the information is transmitted to the controller. The controller determines the blowing height of the first and second air outlets based on the height H of the goods; the air velocity of each air outlet is determined based on the width L1 of the return storage area and the width L3 of the goods. The calculation of the air velocity at the first and second air outlets during receiving is the same as the calculation of the air velocity during leaving. V’ = V 1 ’ + K 2 (L1-L3) / 2; V 1 ’ The wind speed at the maximum width of the outbound goods is taken as 2.5 m / s to 3.0 m / s; K 2 The value ranges from 1 m / s to 1.5 m / s;

[0029] The first infrared sensor is used to monitor the entry of goods into the warehouse. After the goods have completely passed through the inner warehouse door, the air supply speed of the first air outlet is adjusted to the lowest speed. After the inner warehouse door is completely closed, the circulating fan is turned off.

[0030] The first air outlet 8 and the second air outlet 10 each have three or more outlets from bottom to top, and their installation heights correspond one-to-one. In actual operation, due to the different heights of the air outlets, the air curtain height can be divided into multiple levels. Taking three first air outlets as an example: when the height of the goods (including inbound and outbound goods) is within 1.4m, the lowest first air outlet 8a is opened sequentially; when the height of the goods is between 1.4m and 1.8m, the lower first air outlets 8a and 8b are opened; when the height of the goods is greater than 1.8m, all three first air outlets can be opened (i.e., the first air outlets 8a, 8b, and 8c are all opened).

[0031] This invention uses a temperature probe to obtain the heat exchange energy caused by temperature difference and air flow, ensuring the start-up of the circulating fan; it uses an infrared sensor to obtain the width and height of the outgoing goods, and flexibly adjusts the air supply height, air supply angle and air supply speed according to the width and height of the outgoing goods, so as to minimize the heat exchange between the return room and the cold storage room, and between the return room and the passageway, thereby improving the energy utilization efficiency of the cold storage.

[0032] In this invention, the controller can be a general-purpose processor, a special-purpose processor, a conventional processor, a digital signal processor (DSP), multiple microprocessors, one or more microprocessors associated with a DSP core, a controller, a microcontroller, an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) circuit, any other type of integrated circuit (IC), and a state machine, etc. It can also be a programmable logic controller (PLC), or an industrial control computer with important computer attributes and features.

[0033] Finally, it should be emphasized that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still make modifications to the technical solutions described in the foregoing embodiments without creative effort, or make equivalent substitutions for some of the technical features. Therefore, any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for operating a cold storage adjustable double air curtain system, characterized in that: The operation method is that a first temperature probe, a second temperature probe and a third temperature probe are respectively arranged in the refrigeration room, the cage returning room and the passageway, the signal output ends of the first temperature probe, the second temperature probe and the third temperature probe are connected with the signal input end of the controller, the received temperature signals are processed by the controller, the temperature values of the refrigeration room, the cage returning room and the passageway are calculated and recorded as T1, T2 and T3 respectively; The opening and closing states of the two warehouse doors are monitored according to the in-place switch on the cage returning room, when the two warehouse doors are opened, heat exchange exists between the refrigeration room and the cage returning room and between the cage returning room and the passageway, the heat exchange energy caused by the opening of the warehouse doors is calculated according to the temperature values T1, T2 and T3, the heat exchange energy between the refrigeration room and the cage returning room is W1, the heat exchange energy between the cage returning room and the passageway is W2, if W1+W2≥the rated energy consumption W3 of the circulating fan, the circulating fan is started, if W1+W2 The air outlet corresponding to the door between the recycling room and the cold storage room is designated as the first air outlet, and the air outlet corresponding to the door between the recycling room and the passageway is designated as the second air outlet. The air supply angles θ1 and θ2 of the first and second air outlets respectively satisfy the following formulas: θ1 = 80 + K 1 (T2-T1), θ2=80+ K 1 (T3-T2); in the two formulas K 1 This is the air supply angle coefficient, with a value ranging from 0.5 to 0.8; The height H and the width L2 of the outgoing goods are obtained by the first infrared sensor and the information is transmitted to the controller, the blowing height of the first air supply outlet and the second air supply outlet is determined according to the height H of the outgoing goods, the air supply speed of each air supply outlet is determined according to the width L1 of the cage returning room and the width L2 of the outgoing goods: V = V 1 + K2(L1 - L2) / 2; In the formula, V 1 The wind speed is the wind speed at the maximum width of the outgoing goods, and the value is 2.5 m / s to 3.0 m / s; L1 is the width of the cage; and L2 is the width of the outgoing goods. K 2 The wind speed coefficient is 1 m / s to 1.5 m / s.

2. The method of claim 1, wherein the method further comprises: The first air supply outlet and the second air supply outlet are all three or more than three from bottom to top.

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