Operation method of cold storage adjusting type double-air-curtain system

Abstract

The invention discloses an operation method of an adjustable double-air-curtain system of a refrigeration house, which comprises the following steps of: respectively and correspondingly arranging a first temperature probe, a second temperature probe and a third temperature probe in a refrigeration room, a returning room and a penetrating room, and determining an air supply angle according to a temperature difference; and the blowing height and the blowing speed of the first air supply outlet and the second air supply outlet are determined according to the height H and the width L2 of the warehouse-out goods obtained by the infrared sensor. The temperature probe is used for obtaining heat exchange energy caused by temperature difference and air flow, and the starting condition of the circulating fan is ensured; the width and height of warehouse-out goods are obtained based on the infrared sensor, the air supply height, the air supply angle and the air supply speed are flexibly adjusted according to the width and height of the warehouse-out goods, heat exchange between a cage returning room and a refrigerating room and heat exchange between the cage returning room and a penetrating room are reduced to the maximum extent, and then the loss amount of cooling capacity of the refrigerating room in the warehouse entering process is reduced; the energy utilization efficiency of the refrigeration house is improved.

Description

Technical Field

[0001] The invention relates to the field of cold storage, and in particular to an operation method of a cold storage adjustable double air curtain system. Background Art

[0002] Large cold storages generally have frequent goods in and out, and the temperature difference between the cold storage room and the cold storage hall is generally more than 20 degrees. In order to reduce the heat exchange between the cold storage room and the cold storage hall when loading and unloading goods, a return cage room is usually set up inside the cold storage. There is a warehouse door between the return cage room and the cold storage room, and there is a warehouse door between the return cage room and the hall. One or more air curtain machines are installed at each warehouse door. When the air curtain machine is working, it can form an air curtain to block the heat exchange between the cold storage room and the outside world. However, the existing air curtain system can only realize automatic start and stop control, and cannot realize automatic adjustment of air outlet speed, height and angle, which affects the insulation effect. Summary of the invention

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

[0004] To achieve the above object, the present invention adopts the following technical solutions: The operating method of the cold storage adjustable double air curtain system of the present invention comprises the following steps: a first temperature probe, a second temperature probe and a third temperature probe are respectively arranged in the cold storage room, the cage return room and the hallway, the signal output ends of the first temperature probe, the second temperature probe and the third temperature probe are connected to the signal input end of the controller, the controller processes the received temperature signal, and calculates the temperature values ​​of the cold storage room, the cage return room and the hallway, which are recorded as T1, T2 and T3 respectively; The opening and closing status of the two doors are monitored according to the in-place switch on the cage room. When the two doors are opened, there is heat exchange between the cold storage room and the cage room, and between the cage room and the hall. The heat exchange energy caused by the opening of the doors is calculated according to the temperature values ​​​​T1, T2 and T3. The heat exchange energy between the cold storage room and the cage room is W1, and the heat exchange energy between the cage room and the hall 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; The air outlet corresponding to the door between the cage room and the cold storage room is recorded as the first air outlet, and the air outlet corresponding to the door between the cage room and the hall is recorded as the second air outlet. The air supply angle θ1 of the first air outlet and the air supply angle θ2 of the second air outlet respectively satisfy the following formulas: θ1=80+K1(T2-T1), θ2=80+K1(T3-T2); K1 in the two formulas is the air supply angle coefficient, which is 0.5-0.8; The first infrared sensor is used to obtain the height H and width L2 of the outgoing goods and transmit the information to the controller. The controller determines the blowing height of the first air outlet and the second air outlet according to the height H of the outgoing goods; and determines the air supply speed of each air outlet according to the width L1 of the return cage and the width L2 of the outgoing goods: V = V 1 + K 2 (L1-L2) / 2; In the formula, V 1 is the wind speed at the maximum width of the outbound goods, ranging from 2.5m / s to 3.0m / s; L1 is the width of the return cage; L2 is the width of the outbound goods; K 2 is the wind speed coefficient, ranging from 1m / s to 1.5m / s.

[0005] The beneficial effects are as follows: the present invention obtains the heat exchange energy caused by temperature difference and air flow based on the temperature probe to ensure the startup of the circulation fan; obtains the width and height of the goods leaving the warehouse based on the infrared sensor, and flexibly adjusts the air supply height, air supply angle and air supply speed according to the width and height of the goods leaving the warehouse, thereby minimizing the heat exchange between the return cage room, the cold storage room and between the return cage room and the hallway, thereby reducing the loss of cold air in the cold storage room during the entry into the warehouse and improving the energy utilization efficiency of the cold storage.

[0006] Preferably, the first air outlets and the second air outlets are three or more from bottom to top. In actual operation, due to the different heights of the air outlets, the height of the wind curtain can be divided into multiple levels. For example, when the height of the outgoing goods is within 1.4m, the bottom first air outlet is opened successively; when the height of the outgoing goods is between 1.4m and 1.8m, the two lower first air outlets are opened; when the outgoing goods are greater than 1.8m, all three first air outlets can be opened to ensure the wind-blocking effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is a positional relationship diagram of a cold storage room, a cage return room and a hallway in the present invention. DETAILED DESCRIPTION

[0008] The following is a detailed description of an embodiment of the present invention in conjunction with the accompanying drawings. This embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation method and a specific operation process are given, but the protection scope of the present invention is not limited to the following embodiment.

[0009] It should be noted that, in the description of the present invention, relational terms such as “first” and “second” are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations.

[0010] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected" and "connection" that may appear should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0011] like Figure 1 As shown, the present invention proposes an operation method of a cold storage adjustable double air curtain system, in which a first temperature probe 4, a second temperature probe 5 and a third temperature probe 6 are respectively arranged in a cold storage room 1, a cage room 2 and a hallway 3, and the signal output ends of the first temperature probe 4, the second temperature probe 5 and the third temperature probe 6 are connected to the signal input end of a controller, and the controller processes the received temperature signal to calculate and obtain the temperature values ​​of the cold storage room 1, the cage room 2 and the hallway 3, which are recorded as T1, T2 and T3 respectively. The opening and closing status of the two doors are monitored by the in-place switch on the cage room 2. When the two doors are opened successively, heat exchange occurs between the cold storage room 1 and the cage room 2, and between the cage room 2 and the hall 3. The heat exchange energy caused by the opening of the doors is calculated according to the temperature values ​​T1, T2 and T3. The door between the cold storage room 1 and the cage room 2 is recorded as the inner door, and the door between the cage room and the hall is recorded as the outer door. The heat exchange energy between the cold storage room 1 and the cage room 2 is W1, and the heat exchange energy between the cage room 2 and the hall 3 is W2. The calculation formula is as follows: W1= K 3 ×S1×(T2-T1)×t1, S1 is the door opening area corresponding to the inner door, t 1 It is the opening time of the inner door, which is generally controlled within 10 to 20 seconds; K 3 is the air heat exchange coefficient, take 1 / 3; W2= K 3 ×S2×(T3-T2)× t 2 , S2 is the door opening area corresponding to the outer door, t 2 It is the opening time of the outer door, which is generally controlled within 10 to 20 seconds;K 3 is the air heat exchange coefficient, take 1 / 3; The heat exchange energy change caused by entering the storage is compared with the rated energy consumption of the circulating fan 7 (i.e., W3). If W1+W2≥the rated energy consumption W3 of the circulating fan, the circulating fan 7 is started to form an air curtain through the circulating fan 7; if W1+W2<W3, the circulating fan 7 is not started; The air supply outlet corresponding to the inner door is recorded as the first air supply outlet 8, there are three first air supply outlets 8 from top to bottom and each first air supply outlet 8 has a first valve 9, the air supply outlet corresponding to the outer door is recorded as the second air supply outlet 10, there are three second air supply outlets 10 from top to bottom and each second air supply outlet 10 has a second valve 11, the air supply direction of the first air supply outlet 8 and the second air supply outlet 10 can be adjusted by an electric actuator, the control input end of the electric actuator is connected to the control output end of the controller, and the controller is used to control the air supply direction of the first air supply outlet 8 and the second air supply outlet 10, wherein the air supply angle θ1 of the first air supply outlet is 80+ K 1 (T2-T1), the air supply angle of the second air supply port θ2 = 80 + K 1 (T3-T2), K 1 is the air supply angle coefficient, ranging from 0.5 to 0.8; The first infrared sensor 12 is used to obtain the height H and width L2 of the outgoing goods and transmit the information to the controller. The controller determines the blowing height of the first air outlet and the second air outlet according to the height H of the outgoing goods; and determines the air supply speed of each air outlet according to the width L1 of the return cage and the width L2 of the outgoing goods: V = V 1 + K 2 (L1-L2) / 2; In the formula, V 1 is the wind speed at the maximum width of the outbound goods, ranging from 2.5m / s to 3.0m / s; L1 is the width of the return cage; L2 is the width of the outbound goods; K 2 is the wind speed coefficient, ranging from 1m / s to 1.5m / s; The second infrared sensor 13 is used to scan the outgoing goods. When the outgoing goods have completely passed through the outer door, the air supply speed of the second air supply port is adjusted to the minimum speed. When the outer door is closed, the circulating fan is turned off.

[0012] It should be pointed out that the present invention is based on Figure 1The left and right directions in the figure are the width directions. The width L1 of the return cage is usually larger than the maximum width of the outgoing goods, so that the inner door and the outer door can be opened successively during the in-and-out process to avoid opening them at the same time. The maximum width of the outgoing goods refers to the total width of the outgoing goods, and the width L2 of the outgoing goods refers to the width of the part of the outgoing goods located in the return cage during the out-going process.

[0013] Similarly, when entering the warehouse, first determine whether to start the circulation fan 7; use the second infrared sensor 13 to obtain the height H and width L2 of the goods entering the warehouse and transmit the information to the controller, and the controller determines the blowing height of the first air supply port and the second air supply port according to the height H of the goods entering the warehouse; determine the air supply speed of each air supply port according to the width L1 of the return cage and the width L3 of the goods entering the warehouse. The calculation of the air supply speed at the first air supply port and the second air supply port when entering the warehouse is the same as the calculation of the air supply speed when leaving the warehouse: V’ = V 1 ’ + K 2 (L1-L3) / 2; V 1 ’ The wind speed at the maximum width of the outbound goods is 2.5m / s~3.0m / s; K 2 The value range is 1m / s~1.5m / s; The first infrared sensor is used to monitor the incoming goods. When the incoming goods have completely passed through the inner door, the air supply speed of the first air supply port is adjusted to the minimum speed. When the inner door is completely closed, the circulating fan is turned off.

[0014] There are three or more first air outlets 8 and second air outlets 10 from bottom to top, and the installation heights correspond one to one. In actual operation, due to the different heights of the air outlets, the height of the air curtain can be divided into multiple levels. Take the example of three first air outlets: when the height of the goods (including incoming goods and outgoing goods) is within 1.4m, the first air outlet 8a at the bottom is opened successively; when the height of the goods is between 1.4m and 1.8m, the first air outlet 8a and the first air outlet 8b below are opened; when the height of the goods is greater than 1.8m, all three first air outlets can be opened (that is, the first air outlet 8a, the first air outlet 8b and the first air outlet 8c are all opened).

[0015] The present invention obtains the heat exchange energy caused by temperature difference and air flow based on the temperature probe to ensure the startup of the circulation fan; obtains the width and height of the goods leaving the warehouse based on the infrared sensor, and flexibly adjusts the air supply height, air supply angle and air supply speed according to the width and height of the goods leaving the warehouse, thereby minimizing the heat exchange between the return cage room, the cold storage room and between the return cage room and the hallway, thereby improving the energy utilization efficiency of the cold storage.

[0016] In the present invention, the above-mentioned 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 (i.e., PLC), or an industrial computer with important computer properties and characteristics.

[0017] Finally, it should be emphasized that the above is only 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 aforementioned embodiments, those skilled in the art can still modify the technical solutions recorded in the aforementioned embodiments without creative work, or replace some of the technical features therein with equivalents. Therefore, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An operating method of a cold storage adjustable double air curtain system, characterized in that: The operation method is to respectively set a first temperature probe, a second temperature probe and a third temperature probe in the cold storage room, the cage room and the hall, connect the signal output ends of the first temperature probe, the second temperature probe and the third temperature probe to the signal input end of the controller, and use the controller to process the received temperature signal to calculate the temperature values ​​of the cold storage room, the cage room and the hall, which are recorded as T1, T2 and T3 respectively; The opening and closing status of the two doors are monitored according to the in-place switch on the cage room. When the two doors are opened, there is heat exchange between the cold storage room and the cage room, and between the cage room and the hall. The heat exchange energy caused by the opening of the doors is calculated according to the temperature values ​​​​T1, T2 and T3. The heat exchange energy between the cold storage room and the cage room is W1, and the heat exchange energy between the cage room and the hall 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; The air outlet corresponding to the door between the cage room and the cold storage room is recorded as the first air outlet, and the air outlet corresponding to the door between the cage room and the hall is recorded as the second air outlet. The air supply angle θ1 of the first air outlet and the air supply angle θ2 of the second air outlet respectively satisfy the following formulas: θ1=80+ K 1 (T2-T1),θ2=80+ K 1 (T3-T2); in both formulas K 1 is the air supply angle coefficient, ranging from 0.5 to 0.8; The first infrared sensor is used to obtain the height H and width L2 of the outgoing goods and transmit the information to the controller. The controller determines the blowing height of the first air outlet and the second air outlet according to the height H of the outgoing goods; and determines the air supply speed of each air outlet according to the width L1 of the return cage and the width L2 of the outgoing goods: <h2 style=";text-align:left;direction:ltr"> V <h2 style=";text-align:left;direction:ltr"> =<h2 style=";text-align:left;direction:ltr"> V <h2 style=";text-align:left;direction:ltr"> 1 <h2 style=";text-align:left;direction:ltr"> +K2(L1-L2) / 2; In the formula, V 1 is the wind speed at the maximum width of the outbound goods, ranging from 2.5m / s to 3.0m / s; L1 is the width of the return cage; L2 is the width of the outbound goods; K 2 is the wind speed coefficient, ranging from 1m / s to 1.5m / s.

2. The operating method of the cold storage adjustable double air curtain system according to claim 1 is characterized in that: There are three or more first air outlets and second air outlets from bottom to top.

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