CN108332483A - A kind of frostless direct cooling refrigerator of novel energy-conserving and control method - Google Patents

Abstract

The invention provides a novel energy-saving frost-free direct-cooling refrigerator, which includes a nitrogen generating unit, a wind energy storage system and a controller. The nitrogen generating unit includes a tuyere, a nitrogen generator and a nitrogen storage tank. The wind energy storage system includes a freezer bellows. , refrigerating room air box, fan, refrigerating room air outlet, freezing room air outlet, refrigerating room air curtain device, freezing room air curtain device and corresponding air duct system, nitrogen tank, refrigerating room air box and freezing room air box are respectively equipped with pressure sensors , the refrigerator and the freezer are equipped with temperature sensors and humidity sensors, and the nitrogen generating unit and the wind energy storage system are respectively controlled by the controller. The present invention also provides a new energy-saving frost-free direct-cooling refrigerator control method. According to the monitoring of temperature, humidity and pressure, the controller adjusts the working mode of the system to form an air curtain on the refrigerator door and form a certain high pressure on the refrigerator body. , increase the partial pressure of water vapor, prevent the refrigerator from frosting, ensure the normal and efficient operation of the direct cooling refrigerator and achieve the purpose of energy saving at the same time.

Description

A new type of energy-saving frost-free direct cooling refrigerator and its control method

technical field

The invention relates to the technical field of refrigeration, in particular to a novel energy-saving frost-free direct-cooling refrigerator and a control method.

Background technique

With the development of the economy, refrigerators are the necessities of family life.

In terms of existing refrigerators, they are mainly divided into two categories, one is air-cooled refrigerators, and the other is direct-cooled refrigerators. From the perspective of fresh-keeping effect, the direct-cooling refrigerator has a good fresh-keeping effect due to the natural convection formed in the cabinet, which reduces the temperature of food and water loss; from the perspective of product quality, the technology of direct-cooling refrigerators is more mature, and the relative failure rate is lower ;From the perspective of frosting, direct cooling refrigerators need to be cleaned regularly, while air-cooling refrigerators have a defrosting cycle, resulting in large temperature fluctuations in the cabinet. In summary, we can know that the main problem of direct cooling refrigerators is concentrated on frosting aspect.

The reasons for frosting in direct cooling refrigerators are:

(1) The air in the box contains excessive moisture. The source of moisture is mainly from two aspects: first, when the refrigerator is opened, the interaction between the box and the outside air, the outside air carries moisture into the box, and second, The moisture contained in the food stored in the refrigerator evaporates into the box;

(2) The partial pressure of water vapor in the air inside the box is low. During the cooling process of the refrigerator, there is moisture in the box, and the partial pressure of water vapor is low. In the process of temperature drop, the content of water vapor will reach supersaturation, resulting in condensation Frost.

It can be seen that the problem of resolving the frosting of the direct cooling refrigerator is: to reduce the moisture content in the box, it is necessary to reduce the air interaction between the box and the outside world, and to reduce the moisture brought in by the food in the box. The partial pressure of water vapor in the box prevents it from condensing into frost. Accordingly, the present invention proposes a novel energy-saving frost-free direct-cooling refrigerator and a control method thereof.

Contents of the invention

One of the technical problems to be solved by the present invention is to provide a new type of energy-saving frost-free direct cooling refrigerator, which can effectively prevent condensation in the box and save energy at the same time.

One of the technical problems to be solved by the present invention is achieved in this way: a new type of energy-saving frost-free direct-cooling refrigerator, including a nitrogen-generating unit, a wind energy storage system and a controller;

The nitrogen making unit includes a fresh air outlet, a nitrogen generator and a nitrogen storage tank connected in sequence through an air duct, the new air outlet is installed on the back of the refrigerator, and a first pressure sensor is arranged in the nitrogen storage tank;

The wind energy storage system includes a freezer air box, a refrigerator air box, a fan, a refrigerator air outlet, a freezer air outlet, an air curtain device for a refrigerator, an air curtain device for a freezer, and a corresponding air duct system. In the refrigerating chamber of the refrigerator, the air outlet of the freezing chamber is arranged in the freezing chamber of the refrigerator, the air box of the refrigerating chamber is installed between the insulation layer of the refrigerator and the refrigerating chamber, and the air box of the freezing chamber is installed between the insulation layer of the refrigerator and the freezing chamber , the refrigerating room air box is connected to the refrigerating room air curtain device, the freezing room air box is connected to the freezing room air curtain device, the refrigerating room air box is provided with a second pressure sensor, and the refrigerating room air box is provided with a third pressure sensor. A pressure sensor, a first temperature sensor and a first humidity sensor are provided in the refrigerating chamber, a second temperature sensor and a second humidity sensor are provided in the refrigerating chamber, and external locking devices are respectively provided on the refrigerating chamber door and the freezing chamber door ;

The output end of the nitrogen storage tank is provided with a first air volume regulating valve, the first air volume regulating valve is connected to the second air volume regulating valve through the air pipe, and the second air volume regulating valve is connected to the air inlet of the fan through the air pipe, The air inlet of the fan is connected to the air outlet of the refrigerating chamber through the third air volume regulating valve, and is connected to the air outlet of the freezing chamber through the fourth air volume regulating valve. The air volume regulating valve is connected to the air box of the freezer, connected to the air box of the refrigerating room through the sixth air volume regulating valve, connected to the air outlet of the refrigerating room through the seventh air volume regulating valve, and connected to the air outlet of the freezing room through the eighth air volume regulating valve;

The first pressure sensor, the second pressure sensor, the third pressure sensor, the first temperature sensor, the second temperature sensor, the first humidity sensor, the second humidity sensor, the first air volume regulating valve, the second air volume regulating valve, the The third air volume regulating valve, the fourth air volume regulating valve, the fifth air volume regulating valve, the sixth air volume regulating valve, the seventh air volume regulating valve, the eighth air volume regulating valve, the power supply of the fan and the power supply of the nitrogen generator are respectively connected to the controller, controlled by the controller.

Further, single or multiple air curtain devices for the refrigerating room are evenly distributed on the lintel of the refrigerating room, and single or multiple air curtain devices for the freezing room are evenly distributed on the lintel of the freezing room.

Further, the fan is installed between the refrigerator compartment and the freezer compartment.

Further, the air box of the refrigerating room forms an L-shaped surrounding layer outside the refrigerating room, and the air box of the freezing room forms an L-shaped surrounding layer outside the freezing room.

Further, the air box of the refrigerating room forms a U-shaped surrounding layer outside the refrigerating room, and the air box of the freezing room forms a U-shaped surrounding layer outside the freezing room.

The second technical problem to be solved by the present invention is to provide a control method for a new type of energy-saving frost-free direct-cooling refrigerator, which can effectively prevent condensation in the cabinet and save energy at the same time.

The second technical problem to be solved by the present invention is achieved in the following way: a control method for a novel energy-saving frost-free direct-cooling refrigerator needs to provide the above-mentioned novel energy-saving frost-free direct-cooling refrigerator, and the method includes the following steps:

Step 1. Set the temperature range of the refrigerating room to tc1~tc2, and the relative humidity of the refrigerating room The pressure range of the refrigerating room is Pc1～Pc2, the pressure range of the bellows of the refrigerating room is Pcx1～Pcx3～Pcx2, the temperature range of the freezing room is td1～td2, and the relative humidity of the freezing room is The pressure range in the freezing chamber is Pd1~Pd2, the pressure range in the bellows in the freezing chamber is Pdx1~Pdx3~Pdx2, and the pressure range in the nitrogen storage tank is Pg1~Pg2;

Step 2. Set the operating mode: start-up preparation mode, operating conditions of the refrigerator compartment and operating conditions of the freezer compartment;

Step 3. After the initial power-on, enter the start-up preparation mode: the controller turns on the power of the nitrogen generator, generates nitrogen and stores it in the nitrogen storage tank, and when the first pressure sensor detects that the pressure in the nitrogen storage tank reaches Pg2, the nitrogen generator is turned off Then the controller turns on the power of the fan, opens the first air volume regulating valve, the second air volume regulating valve, the fifth air volume regulating valve and the sixth air volume regulating valve, and closes the rest of the air volume regulating valves, the air curtain device and The air curtain device in the freezing room, under the action of the fan, the nitrogen in the nitrogen storage tank is pressed into the air box of the freezing room and the air box of the refrigerator room. When the first pressure sensor detects that the pressure in the nitrogen storage tank is less than or equal to Pg1, the controller turns on the nitrogen generator. The power supply of the machine supplies nitrogen to the nitrogen storage tank until the pressure in the tank is equal to Pg2; when the third pressure sensor detects that the pressure in the air box of the freezer is greater than or equal to Pdx2, the controller closes the fifth air volume regulating valve; When the pressure in the bellows of the refrigerator compartment is greater than or equal to Pcx2, the controller closes the sixth air volume regulating valve. The air volume regulating valve, the second air volume regulating valve, the fifth air volume regulating valve and the sixth air volume regulating valve, the start-up preparation mode ends;

Step 4, the operating conditions of the refrigerator: including steps 4.1 to 4.4;

Step 4.1. When the door of the refrigerator room is opened, the controller turns on the air curtain device of the refrigerator room. The air in the bellows of the refrigerator room passes through the air curtain device to form an air curtain on the door of the refrigerator room to prevent the heat and humidity exchange between the refrigerator room and the surrounding environment. The second pressure sensor detects When the pressure of the bellows in the refrigerating room is less than or equal to Pcx1, the controller turns on the power of the fan, opens the first air volume regulating valve, the second air volume regulating valve and the sixth air volume regulating valve, and closes the rest of the air volume regulating valves. Under the action of the fan, The nitrogen in the nitrogen storage tank is compressed into the air box of the refrigerating room. When the pressure in the air box of the refrigerating room is greater than or equal to Pcx3, the controller turns off the power supply of the fan, the first air volume regulating valve, the second air volume regulating valve and the sixth air volume regulating valve, and it works like this , until the refrigerator door is closed, the controller turns off the air curtain device in the refrigerator, the power supply of the fan, the first air volume regulating valve, the second air volume regulating valve and the sixth air volume regulating valve, and enters step 4.2; when the second pressure sensor detects the When the pressure of the bellows is greater than Pcx1, enter step 4.2;

Step 4.2, the first humidity sensor continuously monitors the humidity in the refrigerating room, when the humidity in the refrigerating room is greater than or equal to , the controller turns on the power of the fan, opens the third air volume regulating valve and the sixth air volume regulating valve, and sucks the air in the refrigerating room into the air box of the refrigerating room, until the pressure in the air box of the refrigerating room is equal to Pcx2, the controller closes the third The air volume regulating valve and the sixth air volume regulating valve, open the first air volume regulating valve, the second air volume regulating valve and the seventh air volume regulating valve, and under the action of the fan, press the nitrogen in the nitrogen storage tank into the refrigerator until it reaches When the pressure is equal to Pc2, the controller closes the first air volume regulating valve, the second air volume regulating valve, the seventh air volume regulating valve and the power supply of the fan; when the humidity of the refrigerating room is less than , the controller opens the first air volume regulating valve, the second air volume regulating valve, and the seventh air volume regulating valve, and under the action of the fan, the nitrogen in the nitrogen storage tank is compressed into the refrigerator until the pressure in the refrigerator is equal to Pc2. The device closes the power supply of the first air volume regulating valve, the second air volume regulating valve, the seventh air volume regulating valve and the fan;

Step 4.3. The first temperature sensor continuously monitors the temperature in the refrigerating chamber. When the temperature in the refrigerating chamber is greater than or equal to tc2, the controller turns on the original refrigeration system of the direct cooling refrigerator to realize cooling. When the temperature in the refrigerating chamber is less than or equal to tc1, The controller stops the original refrigeration system of the direct-cooling refrigerator, and proceeds to step 4.4;

Step 4.4. The second pressure sensor detects the pressure of the air box of the refrigerating room in real time. When the pressure in the air box of the refrigerating room is less than or equal to Pcx1, the controller turns on the power supply of the fan, opens the first air volume regulating valve, the second air volume regulating valve and the sixth air volume regulating valve. Air volume control valve, close the rest of the air volume control valves, under the action of the fan, press the nitrogen in the nitrogen storage tank into the air box of the refrigerator room, when the pressure in the air box of the refrigerator room is greater than or equal to Pcx3, the controller turns off the power of the fan, the first The air volume regulating valve, the second air volume regulating valve and the sixth air volume regulating valve work in this way;

Step 5. Operating conditions of the freezer:

Step 5.1, open the freezer door, the controller turns on the freezer air curtain device, the air in the freezer bellows passes through the air curtain device to form an air curtain on the freezer door to prevent the heat and humidity exchange between the freezer and the surrounding environment, and the third pressure sensor detects the freezing temperature. When the pressure in the freezer air box is less than or equal to Pdx1, the controller turns on the power of the fan, opens the first air volume regulating valve, the second air volume regulating valve and the fifth air volume regulating valve, and closes the rest of the air volume regulating valves. Under the action of the fan, pressurize the nitrogen in the nitrogen storage tank into the air box of the freezer. When the pressure in the air box of the freezer is greater than or equal to Pdx3, the controller turns off the power supply of the fan, the first air volume regulating valve, the second air volume regulating valve and the second air volume regulating valve. Five air volume regulating valves, work like this until the freezer door is closed, the controller closes the freezer air curtain device, the power supply of the fan, the first air volume regulating valve, the second air volume regulating valve and the fifth air volume regulating valve, and enters step 5.2, when When the third pressure sensor detects that the pressure of the freezer bellows is greater than Pdx1, directly enter step 5.2;

Step 5.2, the second humidity sensor continuously monitors the humidity in the freezing chamber, when the humidity in the freezing chamber is greater than or equal to , the controller turns on the power of the fan, opens the fourth air volume regulating valve and the fifth air volume regulating valve, and sucks the air in the freezing room into the freezing room bellows, until the pressure in the freezing room bellows is equal to Pdx2, the controller closes the fourth The air volume regulating valve and the fifth air volume regulating valve, open the first air volume regulating valve, the second air volume regulating valve and the eighth air volume regulating valve, and under the action of the fan, press the nitrogen in the nitrogen storage tank into the freezer until it reaches the freezing point. When the pressure is equal to Pd2, the controller closes the first air volume regulating valve, the second air volume regulating valve, the eighth air volume regulating valve and the power supply of the fan; when the humidity of the freezer is less than , the controller opens the first air volume regulating valve, the second air volume regulating valve and the eighth air volume regulating valve, and under the action of the fan, the nitrogen in the nitrogen storage tank is compressed into the freezing chamber until the pressure in the freezing chamber is equal to Pd2. The device closes the power supply of the first air volume regulating valve, the second air volume regulating valve, the eighth air volume regulating valve and the fan;

Step 5.3. The second temperature sensor continuously monitors the temperature in the freezing chamber. When the temperature in the freezing chamber is greater than or equal to td2, the controller turns on the original refrigeration system of the direct cooling refrigerator to realize cooling. When the temperature in the freezing chamber is less than or equal to td1, the controller Stop the original refrigeration system of the direct cooling refrigerator and proceed to step 5.4;

Step 5.4. The third pressure sensor detects the pressure of the freezer bellows in real time. When the pressure in the freezer bellows is less than or equal to Pdx1, the controller turns on the power of the fans, opens the first air volume regulating valve, the second air volume regulating valve, the second The fifth air volume regulating valve and the eighth air volume regulating valve close the rest of the air volume regulating valves, and under the action of the fan, the nitrogen in the nitrogen storage tank is compressed into the freezer bellows. When the pressure in the freezer bellows is greater than or equal to Pdx3, the controller Turn off the power supply of the blower fan, the first air volume regulating valve, the second air volume regulating valve, the fifth air volume regulating valve and the eighth air volume regulating valve, so work.

The present invention has the following advantages:

1. On the basis of conventional direct-cooling refrigerators, a nitrogen-generating unit and a wind energy storage system are added to automatically monitor the temperature, humidity, and pressure, and adjust the working mode of the system through the controller to form an air curtain on the refrigerator door and form an air curtain on the refrigerator body. A certain high pressure increases the partial pressure of water vapor, so that the refrigerator does not frost, and can ensure the normal and efficient operation of the direct cooling refrigerator;

2. Fill the refrigerator with nitrogen to enhance the freshness preservation effect of the refrigerator;

3. The control device can be controlled manually or automatically, with strong applicability;

4. The nitrogen storage tank is used to reduce the opening frequency and running time of the nitrogen generator, so as to achieve the purpose of energy saving.

Description of drawings

The present invention will be further described below in conjunction with the embodiments with reference to the accompanying drawings.

Fig. 1 is a structural schematic diagram of a novel energy-saving frost-free direct cooling refrigerator of the present invention.

Fig. 2 is a flow chart of the implementation of the control method of a novel energy-saving frost-free direct cooling refrigerator according to the present invention.

Explanation of reference numbers:

11-compressor, 12-condenser, 13-dry filter, 14,-refrigerated capillary, 15-refrigerated evaporator, 16-solenoid valve, 17-freezer capillary, 18-freezer evaporator, 21-new Tuyere, 22-nitrogen generator, 23-nitrogen storage tank, 24-first pressure sensor, 30-freezer, 31-freezer air box, 32-freezer air outlet, 33-freezer air curtain device, 34-third Pressure sensor, 35-second temperature sensor, 36-second humidity sensor, 40-refrigerated room, 41-refrigerated room air box, 42-refrigerated room air outlet, 43-refrigerated room air curtain, 44-second pressure sensor, 45- The first temperature sensor, 46-the first humidity sensor, 50-the fan, 51-the first air volume regulating valve, 52-the second air volume regulating valve, 53-the third air volume regulating valve, 54-the fourth air volume regulating valve, 55- The fifth air volume regulating valve, 56 - the sixth air volume regulating valve, 57 - the seventh air volume regulating valve, 58 - the eighth air volume regulating valve, 60 - the controller.

Detailed ways

As shown in Figure 1, a novel energy-saving frost-free direct-cooling refrigerator of the present invention is an improvement carried out on conventional direct-cooling refrigerators. The refrigeration system of conventional direct-cooling refrigerators includes a compressor 11, a condenser 12, and a drying filter. 13. Refrigeration capillary 14, refrigerating chamber evaporator 15, solenoid valve 16, freezing chamber capillary 17, freezing chamber evaporator 18 and refrigerant pipeline system, the suction port of the compressor 11 is connected with the freezing chamber evaporator 15, After the exhaust port is connected to the condenser 12, it is then connected to the dry filter 13. After the outlet of the dry filter 13 is connected to the solenoid valve 16, it is divided into two branches. Chamber evaporator 15 is connected, and the other branch is connected to freezing chamber capillary tube 17 and then connected to freezing chamber evaporator 18 after being collected with the previous branch, and then connected to the suction pipe of compressor 11. The direct frost refrigerator also includes a nitrogen generating unit, a wind energy storage system and a controller 60;

The nitrogen making unit includes a fresh air outlet 21, a nitrogen generator 22, and a nitrogen storage tank 23 connected in sequence through an air duct. The fresh air outlet 21 is installed on the back of the refrigerator, and the nitrogen storage tank 23 is provided with a first pressure sensor 24 ;

The wind energy storage system includes a freezer bellows 31, a freezer bellows 41, a fan 50, a freezer air outlet 42, a freezer air outlet 32, a refrigerator air curtain device 43, a freezer air curtain device 33 and a corresponding air duct system, The refrigerating room tuyere 42 is set in the refrigerating room 40 of the refrigerator, the freezing room tuyere 32 is set in the freezing room 30 of the refrigerator, and the refrigerating room air box 41 is installed between the insulation layer (not shown) and the refrigerating room of the refrigerator. Between 40, the freezer air box 31 is installed between the insulation layer (not shown) of the refrigerator and the freezer 30, and the refrigerator air box 41 is connected with the refrigerator air curtain device 43, which is the refrigerator air curtain device 43 Provide an air source, the freezer air box 31 is connected to the freezer air curtain device 33 to provide an air source for the freezer air curtain device 33, the refrigerator air box 41 is provided with a second pressure sensor 44, the freezer air box 31 is provided with a third pressure sensor 34, the refrigerator compartment 40 is provided with a first temperature sensor 45 and a first humidity sensor 46, and the freezer compartment 30 is provided with a second temperature sensor 35 and a second humidity sensor 36, The refrigerating chamber door and the freezing chamber door are respectively provided with external locking devices (not shown), which are used to lock the refrigerating chamber door and the freezing chamber door of the refrigerator to prevent the refrigerator door from being automatically opened under the action of the pressure difference. ;

The output end of the nitrogen storage tank 23 is provided with a first air volume regulating valve 51, the first air volume regulating valve 51 is connected with the second air volume regulating valve 52 through the air pipe, and the second air volume regulating valve 52 is connected with the fan through the air pipe. The air inlet of the fan 50 is connected to the air inlet of the fan 50. The air inlet of the fan 50 is connected to the refrigerator compartment air outlet 42 through the third air volume regulating valve 53, and is connected to the freezing chamber air outlet 32 through the fourth air volume regulating valve 54. The air outlet of the fan 50 is connected to the air outlet of the refrigerator compartment. On the air passage between the freezer bellows 31, the fifth air volume regulating valve 55 is connected to the freezer bellows 31, the sixth air volume regulating valve 56 is connected to the refrigerating room bellows 41, and the seventh air volume regulating valve 57 is connected to the refrigerating room air outlet 42. connected, and connected with the freezing chamber tuyere 32 through the eighth air volume regulating valve 58;

The first pressure sensor 24, the second pressure sensor 44, the third pressure sensor 34, the first temperature sensor 46, the second temperature sensor 36, the first humidity sensor 45, the second humidity sensor 35, the first air volume regulating valve 51 , the second air volume regulating valve 52, the third air volume regulating valve 53, the fourth air volume regulating valve 54, the fifth air volume regulating valve 55, the sixth air volume regulating valve 56, the seventh air volume regulating valve 57, the eighth air volume regulating valve 58, The power supply of the fan 50 and the nitrogen generator 22 are respectively connected to the controller 60 and controlled by the controller 60 .

Preferably, one or more air curtain devices 43 for the refrigerating room are evenly distributed on the lintel of the refrigerating room 40 , and one or more air curtain devices 33 for the freezing room are evenly distributed on the lintel of the freezing room 30 .

Preferably, the fan 50 is installed between the refrigerating chamber 40 and the freezing chamber 30, and has a compact structure and reduces extra space.

In one embodiment, the air box 41 of the refrigerating room forms an L-shaped surrounding layer outside the refrigerating room 40, and the air box 31 of the freezing room forms an L-shaped surrounding layer outside the freezing room 30, forming a structure that half surrounds the box body to improve heat preservation. Effect.

In another embodiment, the air box 41 of the refrigerating room forms a U-shaped surrounding layer outside the refrigerating room 40 , and the air box 31 of the freezing room forms a U-shaped surrounding layer outside the freezing room 30 to further improve the heat preservation effect.

As shown in Fig. 2, the control method of a novel energy-saving frost-free direct-cooling refrigerator of the present invention needs to provide the above-mentioned novel energy-saving frost-free direct-cooling refrigerator, and the method includes the following steps:

Step 1. Set the temperature range of the refrigerating room 40 as tc1-tc2 (for example, 4°C-8°C), and the relative humidity of the refrigerating room 40 (E.g ), the pressure range in the refrigerator compartment 40 is Pc1～Pc2 (for example, 1.0atm～1.3atm), and the pressure range in the bellows 41 for the refrigerator compartment is Pcx1～Pcx3～Pcx2 (for example, 1.2atm～1.6atm～1.8atm), that is, three The stalls are easy to control, Pcx1<Pcx3<Pcx2, the temperature range of the freezer 30 is td1~td2 (for example -24°C~-4°C), and the relative humidity of the freezer 30 (E.g ), the pressure range in the freezer 30 is Pd1～Pd2 (such as 1.0atm～1.3atm), the pressure range in the freezer bellows 31 is Pdx1～Pdx3～Pdx2 (such as 1.2atm～1.6atm～1.8atm), and the nitrogen storage tank 23 The internal pressure range is Pg1～Pg2 (such as 1.3atm～1.8atm), that is, three gears are set for easy control, Pdx1<Pdx3<Pdx2;

Step 2. Set the operating mode: start-up preparation mode, operating conditions of the refrigerator compartment and operating conditions of the freezer compartment;

Step 3. After the initial power-on, enter the start-up preparation mode: the controller 60 turns on the power supply of the nitrogen generator 22, generates nitrogen and stores it in the nitrogen storage tank 23, and the first pressure sensor 24 detects that the pressure in the nitrogen storage tank 23 reaches Pg2 (1.8atm), close the power supply of nitrogen generator 22, then controller 60 opens the power supply of fan 50, opens the first air volume regulating valve 51, the second air volume regulating valve 52, the fifth air volume regulating valve 55 and the sixth air volume regulating valve. Valve 56 closes the rest of the air volume regulating valve, the air curtain device 43 in the refrigerating room and the air curtain device 33 in the refrigerating room. When the first pressure sensor 24 detects that the pressure in the nitrogen storage tank 23 is less than or equal to Pg1 (1.3 atm), the controller 60 connects the power supply of the nitrogen generator 22 to replenish nitrogen in the nitrogen storage tank 23 until the pressure in the tank is equal to Pg2 (1.8 atm). atm); when the third pressure sensor 34 detects that the pressure in the freezer air box 31 is greater than or equal to Pdx2 (1.8atm), the controller 60 closes the fifth air volume regulating valve 55; When it is equal to Pcx2 (1.8atm), the controller 60 closes the sixth air volume regulating valve 56, and when it is detected that the pressure in the freezer air box 31 is greater than or equal to Pdx2 (1.8atm) and the pressure in the refrigerator air box 41 is greater than or equal to Pcx2 (1.8atm) , the controller 60 turns off the power supply of the fan 50, the first air volume regulating valve 51, the second air volume regulating valve 52, the fifth air volume regulating valve 55 and the sixth air volume regulating valve 56, and the start-up preparation mode ends;

Step 4, the operating conditions of the refrigerator: including steps 4.1 to 4.4;

Step 4.1. When the door of the refrigerator room is opened, the controller 60 turns on the air curtain device 43 of the refrigerator room, and the air in the bellows 41 of the refrigerator room passes through the air curtain device 43 to form an air curtain on the door of the refrigerator room to prevent the heat and humidity exchange between the refrigerator room and the surrounding environment. When the second pressure sensor 44 detects that the pressure of the air box 41 in the refrigerator compartment is less than or equal to Pcx1 (1.2atm), the controller 60 turns on the power of the fan 50, and opens the first air volume regulating valve 51, the second air volume regulating valve 52 and the sixth air volume regulating valve. 56. Close the remaining air volume regulating valves. Under the action of the fan 50, the nitrogen in the nitrogen storage tank 23 is compressed into the air box 41 of the refrigerating room. When the pressure in the air box 41 of the refrigerating room is greater than or equal to Pcx3 (1.6 atm), the controller 60 is closed The power supply of fan 50, the first air volume regulating valve 51, the second air volume regulating valve 52 and the sixth air volume regulating valve 56 work like this until the door of the refrigerator compartment is closed, and the controller 60 closes the power supply of the refrigerator compartment air curtain device 43 and fan 50 , the first air volume regulating valve 51, the second air volume regulating valve 52 and the sixth air volume regulating valve 56, enter step 4.2; when the second pressure sensor detects that the pressure of the refrigerator compartment air box is greater than Pcx1 (1.2atm), enter step 4.2;

Step 4.2, the first humidity sensor 46 continuously monitors the humidity in the refrigerating room 40, when the humidity in the refrigerating room 40 is greater than or equal to (60%), the controller 60 turns on the power supply of the blower fan 50, opens the third air volume regulating valve 53 and the sixth air volume regulating valve 56, and sucks the air in the refrigerating room 40 into the refrigerating room air box 41 until the refrigerating room air box 41 When the internal pressure is equal to Pcx2 (1.8atm), the controller 60 closes the third air volume regulating valve 53 and the sixth air volume regulating valve 56, and opens the first air volume regulating valve 51, the second air volume regulating valve 52 and the seventh air volume regulating valve 57 , under the action of the fan 50, the nitrogen in the nitrogen storage tank 23 is pressed into the refrigerator compartment 40 until the pressure in the refrigerator compartment 40 is equal to Pc2 (1.3atm), the controller 60 closes the first air volume regulating valve 51, the second air volume Regulating valve 52, the seventh air volume regulating valve 57 and the power supply of fan 50; when the humidity of refrigerating room 40 is less than (60%), the controller 60 opens the first air volume regulating valve 51, the second air volume regulating valve 52 and the seventh air volume regulating valve 57, and under the action of the fan 50, the nitrogen in the nitrogen storage tank 23 is pressed into the refrigerator compartment 40. When the pressure in the refrigerating chamber 40 is equal to Pc2 (1.3atm), the controller 60 closes the power supply of the first air volume regulating valve 51, the second air volume regulating valve 52, the seventh air volume regulating valve 57 and the fan 50;

Step 4.3. The first temperature sensor 45 continuously monitors the temperature in the refrigerator compartment 40. When the temperature in the refrigerator compartment is greater than or equal to tc2 (8°C), the controller 60 turns on the original refrigeration system of the direct-cooling refrigerator to achieve refrigeration. When the indoor temperature is less than or equal to tc1 (4°C), the controller stops the original refrigeration system of the direct cooling refrigerator and enters step 4.4;

Step 4.4: The temperature in the refrigerator compartment 40 decreases. Due to the structural characteristics of the refrigerator compartment bellows 41, the air temperature in the refrigerator compartment bellows 41 also decreases, and the pressure of the refrigerator compartment bellows 41 also decreases. The second pressure sensor 44 detects the temperature of the refrigerator in real time. When the pressure in the air box 41 of the refrigerating room is less than or equal to Pcx1 (1.2atm), the controller 60 turns on the power supply of the fan 50, opens the first air volume regulating valve 51, the second air volume regulating valve 52 and the sixth air volume regulating valve. valve 56, close the remaining air volume regulating valves, under the action of fan 50, press the nitrogen in the nitrogen storage tank 23 into the air box 41 of the refrigerating room, when the pressure in the air box 41 of the refrigerating room is greater than or equal to Pcx3 (1.6 atm), the controller 60 turn off the power supply of fan 50, the first air volume regulating valve 51, the second air volume regulating valve 52 and the sixth air volume regulating valve 56, so work;

Step 5, the operating conditions of the freezer, including steps 5.1 to 5.4;

Step 5.1, open the freezer door, the controller 60 opens the freezer air curtain device 33, the air in the freezer bellows 31 passes through the air curtain device 33 to form an air curtain on the freezer door to prevent the heat and moisture exchange between the freezer and the surrounding environment, the third The pressure sensor 34 detects the pressure of the freezer bellows 31. When the pressure in the freezer bellows 31 is less than or equal to Pdx1 (1.2 atm), the controller 60 turns on the power of the fan 50, and opens the first air volume regulating valve 51 and the second air volume regulating valve. 52 and the fifth air volume regulating valve 55, close the rest of the air volume regulating valves, under the effect of fan 50, the nitrogen in the nitrogen storage tank 23 is pressed into the freezer bellows 31, and the pressure in the freezer bellows 31 is greater than or equal to Pdx3 (1.6 atm), the controller 60 turns off the power supply of the fan 50, the first air volume regulating valve 51, the second air volume regulating valve 52 and the fifth air volume regulating valve 55, and works like this until the freezer door is closed, and the controller 60 closes the freezer air. The power supply of the curtain device 33, the fan 50, the first air volume regulating valve 51, the second air volume regulating valve 52 and the fifth air volume regulating valve 55, enter step 5.2, when the third pressure sensor detects that the pressure of the freezer air box is greater than Pdx1 (1.2 atm ) and go directly to step 5.2;

Step 5.2, the second humidity sensor 36 continuously monitors the humidity in the freezing chamber 30, when the humidity in the freezing chamber 30 is greater than or equal to (40%), the controller 60 connects the power supply of the fan 50, opens the fourth air volume regulating valve 54 and the fifth air volume regulating valve 55, and the air in the freezing chamber 30 is sucked into the freezing chamber bellows 31 until the freezing chamber bellows 31 When the internal pressure is equal to Pdx2 (1.8 atm), the controller 60 closes the fourth air volume regulating valve 54 and the fifth air volume regulating valve 55, and opens the first air volume regulating valve 51, the second air volume regulating valve 52 and the eighth air volume regulating valve 58 , under the action of the fan 50, the nitrogen in the nitrogen storage tank 23 is pressed into the freezer 30 until the pressure in the freezer 30 is equal to Pd2 (1.3atm), the controller 60 closes the first air volume regulating valve 51, the second air volume Regulating valve 52, the eighth air volume regulating valve 58 and the power supply of blower fan 50; When freezing chamber 30 humidity is less than (40%), the controller 60 opens the first air volume regulating valve 51, the second air volume regulating valve 52 and the eighth air volume regulating valve 58, and under the action of the fan 50, the nitrogen in the nitrogen storage tank 23 is pressed into the freezing chamber 30. When the pressure in the freezing chamber 30 is equal to Pd2 (1.3 atm), the controller 60 closes the power supply of the first air volume regulating valve 51, the second air volume regulating valve 52, the eighth air volume regulating valve 58 and the fan 50;

Step 5.3, the second temperature sensor 35 continuously monitors the temperature in the freezing chamber 30, and when the temperature in the freezing chamber 30 is greater than or equal to td2 (-4°C), the controller 60 turns on the original refrigeration system of the direct cooling refrigerator to realize refrigeration , when the temperature in the freezing chamber is less than or equal to td1 (-24°C), the controller 60 stops the original refrigeration system of the direct cooling refrigerator, and enters step 5.4;

Step 5.4, the temperature in the freezer compartment 30 decreases. Due to the structural characteristics of the freezer compartment bellows 31, the temperature of the air in the freezer compartment bellows 31 also decreases, and the pressure of the freezer compartment bellows 31 also decreases. The third pressure sensor 34 detects the freezing temperature in real time. When the pressure in the air box 31 of the freezing room is less than or equal to Pdx1 (1.2 atm), the controller 60 turns on the power supply of the fan 50, opens the first air volume regulating valve 51, the second air volume regulating valve 52, and the fifth air volume Regulating valve 55 and the eighth air volume regulating valve 58, close the remaining air volume regulating valves, under the action of fan 50, press the nitrogen in the nitrogen storage tank 23 into the freezer bellows 31, and the pressure in the freezer bellows 31 is greater than or equal to Pdx3 (1.6atm), controller 60 closes the power supply of blower fan 50, the first air volume control valve 51, the second air volume control valve 52, the fifth air volume control valve 55 and the eighth air volume control valve 58, and works like this.

The device of the invention is easy to operate, and can automatically monitor the temperature, humidity and pressure, adjust the working mode of the system through the controller, form an air curtain on the refrigerator door body, and form a certain high pressure on the refrigerator body to increase the partial pressure of water vapor, so that The refrigerator does not frost; the device and method of the invention are reliable and can ensure the normal and efficient operation of the direct cooling refrigerator; the invention fills the refrigerator with nitrogen to enhance the freshness preservation effect of the refrigerator; the control device of the invention can be controlled manually At the same time, the present invention utilizes the nitrogen storage tank to reduce the opening frequency and running time of the nitrogen generator, so as to achieve the purpose of energy saving.

Although the specific embodiments of the present invention have been described above, those skilled in the art should understand that the specific embodiments we have described are only illustrative, rather than used to limit the scope of the present invention. Equivalent modifications and changes made by skilled personnel in accordance with the spirit of the present invention shall fall within the protection scope of the claims of the present invention.

Claims (6)

1. A new type of energy-saving frost-free direct-cooling refrigerator, characterized in that it includes a nitrogen-generating unit, a wind energy storage system and a controller; The nitrogen making unit includes a fresh air outlet, a nitrogen generator and a nitrogen storage tank connected in sequence through an air duct, the new air outlet is installed on the back of the refrigerator, and a first pressure sensor is arranged in the nitrogen storage tank; The wind energy storage system includes a freezer air box, a refrigerator air box, a fan, a refrigerator air outlet, a freezer air outlet, an air curtain device for a refrigerator, an air curtain device for a freezer, and a corresponding air duct system. In the refrigerating chamber of the refrigerator, the air outlet of the freezing chamber is arranged in the freezing chamber of the refrigerator, the air box of the refrigerating chamber is installed between the insulation layer of the refrigerator and the refrigerating chamber, and the air box of the freezing chamber is installed between the insulation layer of the refrigerator and the freezing chamber , the refrigerating room air box is connected to the refrigerating room air curtain device, the freezing room air box is connected to the freezing room air curtain device, the refrigerating room air box is provided with a second pressure sensor, and the refrigerating room air box is provided with a third pressure sensor. A pressure sensor, a first temperature sensor and a first humidity sensor are provided in the refrigerating chamber, a second temperature sensor and a second humidity sensor are provided in the refrigerating chamber, and external locking devices are respectively provided on the refrigerating chamber door and the freezing chamber door ; The output end of the nitrogen storage tank is provided with a first air volume regulating valve, the first air volume regulating valve is connected to the second air volume regulating valve through the air pipe, and the second air volume regulating valve is connected to the air inlet of the fan through the air pipe, The air inlet of the fan is connected to the air outlet of the refrigerating chamber through the third air volume regulating valve, and is connected to the air outlet of the freezing chamber through the fourth air volume regulating valve. The air volume regulating valve is connected to the air box of the freezer, connected to the air box of the refrigerating room through the sixth air volume regulating valve, connected to the air outlet of the refrigerating room through the seventh air volume regulating valve, and connected to the air outlet of the freezing room through the eighth air volume regulating valve; The first pressure sensor, the second pressure sensor, the third pressure sensor, the first temperature sensor, the second temperature sensor, the first humidity sensor, the second humidity sensor, the first air volume regulating valve, the second air volume regulating valve, the The third air volume regulating valve, the fourth air volume regulating valve, the fifth air volume regulating valve, the sixth air volume regulating valve, the seventh air volume regulating valve, the eighth air volume regulating valve, the power supply of the fan and the power supply of the nitrogen generator are respectively connected to the controller, controlled by the controller. 2. A new type of energy-saving frost-free direct-cooling refrigerator according to claim 1, characterized in that: the air curtain device in the refrigerating room is single or multiple evenly distributed on the lintel of the refrigerating room, and the air curtain device in the freezing room Single or multiple evenly distributed on the lintel of the freezer. 3. A new type of energy-saving frost-free direct cooling refrigerator according to claim 1, wherein the fan is installed between the refrigerator compartment and the freezer compartment. 4. A new type of energy-saving frost-free direct cooling refrigerator according to claim 1, characterized in that: the air box of the refrigerating room forms an L-shaped surrounding layer outside the refrigerating room, and the air box of the freezing room forms an L-shaped surrounding layer outside the refrigerating room . 5. A new type of energy-saving frost-free direct cooling refrigerator according to claim 1, characterized in that: the air box of the refrigerating room forms a U-shaped surrounding layer outside the refrigerating room, and the air box in the freezing room forms a U-shaped surrounding layer outside the refrigerating room . 6. A new energy-saving frost-free direct-cooling refrigerator control method, characterized in that: a new energy-saving frost-free direct-cooling refrigerator as described in any one of claims 1-5 is required, and the method includes the following steps: Step 1. Set the temperature range of the refrigerating room to tc1~tc2, and the relative humidity of the refrigerating room The pressure range of the refrigerating room is Pc1～Pc2, the pressure range of the bellows of the refrigerating room is Pcx1～Pcx3～Pcx2, the temperature range of the freezing room is td1～td2, and the relative humidity of the freezing room is The pressure range in the freezing chamber is Pd1~Pd2, the pressure range in the bellows in the freezing chamber is Pdx1~Pdx3~Pdx2, and the pressure range in the nitrogen storage tank is Pg1~Pg2; Step 2. Set the operating mode: start-up preparation mode, operating conditions of the refrigerator compartment and operating conditions of the freezer compartment; Step 3. After the initial power-on, enter the start-up preparation mode: the controller turns on the power of the nitrogen generator, generates nitrogen and stores it in the nitrogen storage tank, and when the first pressure sensor detects that the pressure in the nitrogen storage tank reaches Pg2, the nitrogen generator is turned off Then the controller turns on the power of the fan, opens the first air volume regulating valve, the second air volume regulating valve, the fifth air volume regulating valve and the sixth air volume regulating valve, and closes the rest of the air volume regulating valves, the air curtain device and The air curtain device in the freezing room, under the action of the fan, the nitrogen in the nitrogen storage tank is pressed into the air box of the freezing room and the air box of the refrigerator room. When the first pressure sensor detects that the pressure in the nitrogen storage tank is less than or equal to Pg1, the controller turns on the nitrogen generator. The power supply of the machine supplies nitrogen to the nitrogen storage tank until the pressure in the tank is equal to Pg2; when the third pressure sensor detects that the pressure in the air box of the freezer is greater than or equal to Pdx2, the controller closes the fifth air volume regulating valve; When the pressure in the bellows of the refrigerator compartment is greater than or equal to Pcx2, the controller closes the sixth air volume regulating valve. The air volume regulating valve, the second air volume regulating valve, the fifth air volume regulating valve and the sixth air volume regulating valve, the start-up preparation mode ends; Step 4, the operating conditions of the refrigerator: including steps 4.1 to 4.4; Step 4.1. When the door of the refrigerator room is opened, the controller turns on the air curtain device of the refrigerator room. The air in the bellows of the refrigerator room passes through the air curtain device to form an air curtain on the door of the refrigerator room to prevent the heat and humidity exchange between the refrigerator room and the surrounding environment. The second pressure sensor detects When the pressure of the bellows in the refrigerating room is less than or equal to Pcx1, the controller turns on the power of the fan, opens the first air volume regulating valve, the second air volume regulating valve and the sixth air volume regulating valve, and closes the rest of the air volume regulating valves. Under the action of the fan, The nitrogen in the nitrogen storage tank is compressed into the air box of the refrigerating room. When the pressure in the air box of the refrigerating room is greater than or equal to Pcx3, the controller turns off the power supply of the fan, the first air volume regulating valve, the second air volume regulating valve and the sixth air volume regulating valve, and it works like this , until the refrigerator door is closed, the controller turns off the air curtain device in the refrigerator, the power supply of the fan, the first air volume regulating valve, the second air volume regulating valve and the sixth air volume regulating valve, and enters step 4.2; when the second pressure sensor detects the When the pressure of the bellows is greater than Pcx1, enter step 4.2; Step 4.2, the first humidity sensor continuously monitors the humidity in the refrigerating room, when the humidity in the refrigerating room is greater than or equal to , the controller turns on the power of the fan, opens the third air volume regulating valve and the sixth air volume regulating valve, and sucks the air in the refrigerating room into the air box of the refrigerating room, until the pressure in the air box of the refrigerating room is equal to Pcx2, the controller closes the third The air volume regulating valve and the sixth air volume regulating valve, open the first air volume regulating valve, the second air volume regulating valve and the seventh air volume regulating valve, and under the action of the fan, press the nitrogen in the nitrogen storage tank into the refrigerator until it reaches When the pressure is equal to Pc2, the controller closes the first air volume regulating valve, the second air volume regulating valve, the seventh air volume regulating valve and the power supply of the fan; when the humidity of the refrigerating room is less than , the controller opens the first air volume regulating valve, the second air volume regulating valve, and the seventh air volume regulating valve, and under the action of the fan, the nitrogen in the nitrogen storage tank is compressed into the refrigerator until the pressure in the refrigerator is equal to Pc2. The device closes the power supply of the first air volume regulating valve, the second air volume regulating valve, the seventh air volume regulating valve and the fan; Step 4.3. The first temperature sensor continuously monitors the temperature in the refrigerating chamber. When the temperature in the refrigerating chamber is greater than or equal to tc2, the controller turns on the original refrigeration system of the direct cooling refrigerator to realize cooling. When the temperature in the refrigerating chamber is less than or equal to tc1, The controller stops the original refrigeration system of the direct-cooling refrigerator, and proceeds to step 4.4; Step 4.4. The second pressure sensor detects the pressure of the air box of the refrigerating room in real time. When the pressure in the air box of the refrigerating room is less than or equal to Pcx1, the controller turns on the power supply of the fan, opens the first air volume regulating valve, the second air volume regulating valve and the sixth air volume regulating valve. Air volume control valve, close the rest of the air volume control valves, under the action of the fan, press the nitrogen in the nitrogen storage tank into the air box of the refrigerator room, when the pressure in the air box of the refrigerator room is greater than or equal to Pcx3, the controller turns off the power of the fan, the first The air volume regulating valve, the second air volume regulating valve and the sixth air volume regulating valve work in this way; Step 5. Operating conditions of the freezer: Step 5.1, open the freezer door, the controller turns on the freezer air curtain device, the air in the freezer bellows passes through the air curtain device to form an air curtain on the freezer door to prevent the heat and humidity exchange between the freezer and the surrounding environment, and the third pressure sensor detects the freezing temperature. When the pressure in the freezer air box is less than or equal to Pdx1, the controller turns on the power of the fan, opens the first air volume regulating valve, the second air volume regulating valve and the fifth air volume regulating valve, and closes the rest of the air volume regulating valves. Under the action of the fan, pressurize the nitrogen in the nitrogen storage tank into the air box of the freezer. When the pressure in the air box of the freezer is greater than or equal to Pdx3, the controller turns off the power supply of the fan, the first air volume regulating valve, the second air volume regulating valve and the second air volume regulating valve. Five air volume regulating valves, work like this until the freezer door is closed, the controller closes the freezer air curtain device, the power supply of the fan, the first air volume regulating valve, the second air volume regulating valve and the fifth air volume regulating valve, and enters step 5.2, when When the third pressure sensor detects that the pressure of the freezer bellows is greater than Pdx1, directly enter step 5.2; Step 5.2, the second humidity sensor continuously monitors the humidity in the freezing chamber, when the humidity in the freezing chamber is greater than or equal to , the controller turns on the power of the fan, opens the fourth air volume regulating valve and the fifth air volume regulating valve, and sucks the air in the freezing room into the freezing room bellows, until the pressure in the freezing room bellows is equal to Pdx2, the controller closes the fourth The air volume regulating valve and the fifth air volume regulating valve, open the first air volume regulating valve, the second air volume regulating valve and the eighth air volume regulating valve, and under the action of the fan, press the nitrogen in the nitrogen storage tank into the freezer until it reaches the freezing point. When the pressure is equal to Pd2, the controller closes the first air volume regulating valve, the second air volume regulating valve, the eighth air volume regulating valve and the power supply of the fan; when the humidity of the freezer is less than , the controller opens the first air volume regulating valve, the second air volume regulating valve and the eighth air volume regulating valve, and under the action of the fan, the nitrogen in the nitrogen storage tank is compressed into the freezing chamber until the pressure in the freezing chamber is equal to Pd2. The device closes the power supply of the first air volume regulating valve, the second air volume regulating valve, the eighth air volume regulating valve and the fan; Step 5.3. The second temperature sensor continuously monitors the temperature in the freezing chamber. When the temperature in the freezing chamber is greater than or equal to td2, the controller turns on the original refrigeration system of the direct cooling refrigerator to realize refrigeration. When the temperature in the freezing chamber is less than or equal to td1, The controller stops the original refrigeration system of the direct-cooling refrigerator, and proceeds to step 5.4; Step 5.4. The third pressure sensor detects the pressure of the freezer bellows in real time. When the pressure in the freezer bellows is less than or equal to Pdx1, the controller turns on the power of the fans, opens the first air volume regulating valve, the second air volume regulating valve, the second The fifth air volume regulating valve and the eighth air volume regulating valve close the rest of the air volume regulating valves, and under the action of the fan, the nitrogen in the nitrogen storage tank is compressed into the freezer bellows. When the pressure in the freezer bellows is greater than or equal to Pdx3, the controller Turn off the power supply of the blower fan, the first air volume regulating valve, the second air volume regulating valve, the fifth air volume regulating valve and the eighth air volume regulating valve, so work.