Refrigeration equipment negative pressure fresh-keeping and air pressure balancing device and control method thereof

Abstract

The application discloses a refrigeration equipment negative pressure fresh-keeping and air pressure balancing device and a control method thereof, and relates to the technical field of refrigeration equipment. The device comprises a box body, a negative pressure fresh-keeping bin, a negative pressure vacuum pump and a double-channel exhaust valve. An air pressure sensor and a control module are arranged in the box body for monitoring air pressure. The negative pressure vacuum pump is used for extracting gas in the negative pressure fresh-keeping bin. The negative pressure vacuum pump is connected with the double-channel exhaust valve. The air inlet of the double-channel exhaust valve is communicated with the negative pressure fresh-keeping bin. The exhaust outlet one of the double-channel exhaust valve is communicated with the inside of the box body. The exhaust outlet two of the double-channel exhaust valve is communicated with the outside of the box body. The negative pressure vacuum pump, the double-channel exhaust valve and the air pressure sensor are electrically connected with the control module. The control module is used for collecting and processing data from the air pressure sensor, and controlling the start and stop of the negative pressure vacuum pump and the opening direction of the exhaust outlet of the double-channel exhaust valve according to the data. The application can realize the control of air pressure balance inside and outside the box body through a system, and saves time and effort.

Description

Technical Field

[0001] This invention relates to the field of refrigeration equipment technology, specifically to a negative pressure preservation and air pressure balance device for refrigeration equipment and its control method. Background Technology

[0002] With the continuous development of refrigeration technology, the temperatures that refrigeration equipment such as refrigerators and freezers can reach are getting lower and lower. However, an unavoidable problem is that when the door of the refrigeration equipment is opened, hot air from outside will enter the cabinet. After the door is closed, the temperature of the hot air gradually decreases under the action of the compressor. Due to the thermal expansion and contraction of air and the fact that the cabinet is a sealed space, the air pressure inside the cabinet will be lower than the air pressure outside the cabinet. This causes the problem of difficulty in opening the door. Moreover, the lower the temperature inside the cabinet, the more prominent this problem becomes, resulting in a poor user experience.

[0003] Meanwhile, in order to meet the needs of high-end users for food preservation and storage, the demand for negative pressure preservation or vacuum preservation is increasing. Currently, the products on the market separate the door opening method, air pressure balancing device and negative pressure preservation storage control method of the cryogenic equipment. They have not integrated the technology to form a unified working system, and cannot meet the functions of controlling the air pressure balance inside and outside the box and the preservation and storage of negative pressure chambers. Summary of the Invention

[0004] The first technical problem to be solved by this invention is to provide a negative pressure preservation and air pressure balancing device for refrigeration equipment, which extracts the gas in the negative pressure preservation chamber into the box body, so that the pressure difference between the inside and outside of the box body is kept at a small level, while also providing the function of negative pressure preservation. The same device achieves two different functions, improves the preservation effect, makes it convenient to open the door, and saves time and effort.

[0005] This invention includes a housing, inside which are a negative pressure preservation chamber, a negative pressure vacuum pump, and a dual-channel exhaust valve. It also includes a pressure sensor for monitoring air pressure and a control module. The negative pressure vacuum pump is used to extract gas from the negative pressure preservation chamber. The negative pressure vacuum pump is connected to the dual-channel exhaust valve, whose inlet is connected to the negative pressure preservation chamber, and whose exhaust port 1 is connected to the interior of the housing, while its exhaust port 2 is connected to the exterior of the housing. The negative pressure vacuum pump, the dual-channel exhaust valve, and the pressure sensor are electrically connected to the control module. The control module collects and processes data from the pressure sensor and controls the start and stop of the negative pressure vacuum pump and the opening direction of the dual-channel exhaust valve's outlet based on the data.

[0006] With the above structure, a negative pressure vacuum pump is installed inside the negative pressure preservation chamber. A dual-channel exhaust valve is connected to the vacuum pump. The inlet of the dual-channel exhaust valve is connected to the negative pressure preservation chamber, the exhaust port one is connected to the inside of the chamber, and the exhaust port two is connected to the outside of the chamber. The control module judges the air pressure inside and outside the chamber based on the collected values ​​from the air pressure sensor. When the pressure difference between the inside and outside of the chamber exceeds 100 Pa for 5 consecutive minutes, the negative pressure vacuum pump inside the negative pressure preservation chamber starts working, and the dual-channel exhaust valve opens the chamber. The inward-facing vent allows the negative pressure vacuum pump to draw gas from the negative pressure preservation compartment into the main body of the chamber until the pressure difference between the inside and outside of the chamber is less than 100Pa, facilitating user access to open the door. After the negative pressure vacuum pump draws gas out of the chamber, it maintains a negative pressure environment, extending the food preservation time. When the pressure difference between the inside and outside of the chamber is less than 100Pa and further depressurization of the chamber is required, the negative pressure vacuum pump continues to operate, and the dual-channel exhaust valve opens to connect with the outside, venting gas to the outside of the chamber.

[0007] Preferably, the pressure sensor includes a negative pressure compartment pressure sensor located inside the negative pressure preservation compartment, an internal pressure sensor located inside the refrigeration equipment, and an external pressure sensor located outside the equipment. The pressure sensor is used to monitor the pressure in the negative pressure preservation compartment, inside the refrigeration equipment, and outside the refrigeration equipment, and to feed it back to the control module.

[0008] Preferably, a one-way valve is installed at the air inlet.

[0009] Preferably, the negative pressure preservation chamber is also equipped with a pressure relief valve for depressurizing the negative pressure preservation chamber, and the pressure relief valve is electrically connected to the control module.

[0010] Preferably, the system also includes a display terminal, which is a liquid crystal touch screen, and the display terminal is connected to the control module.

[0011] Preferably, it also includes a wireless port that can connect to a mobile phone, enabling remote control of the refrigeration equipment via the mobile phone.

[0012] In summary, the present invention has the following beneficial effects:

[0013] 1) The gas inside the negative pressure preservation compartment is drawn into the cabinet through a negative pressure vacuum pump, which reduces the pressure difference between the inside and outside of the cabinet. The pressure balance mode reduces the difficulty of opening the cabinet door, saves effort, improves the user experience, and at the same time reduces mechanical damage to the cabinet itself and extends the service life of the machinery.

[0014] 2) The gas inside the negative pressure preservation chamber is extracted by a negative pressure vacuum pump, which reduces the air pressure inside the negative pressure preservation chamber and improves the preservation effect.

[0015] 3) The exhaust channels of the dual-channel exhaust valve can be selected. Different exhaust channels can be selected under different air pressure conditions to complete the negative pressure preservation function at any time.

[0016] The second technical problem to be solved by the present invention is to provide a control method for a negative pressure preservation and air pressure balance device for refrigeration equipment. Through a system, the control of air pressure balance inside and outside the cabinet can be realized, and the negative pressure preservation function of the refrigeration equipment can also be controlled. It is convenient to use and provides a good user experience.

[0017] Specifically, the steps include the following:

[0018] S1: When the door is closed and the power is on, the air pressure sensor collects air pressure values, and the control module calculates the pressure difference between the inside and outside of the chamber. It determines whether the pressure difference between the inside and outside of the chamber is greater than 100Pa for 5 consecutive minutes. If so, the negative pressure vacuum pump starts to work, and the dual-channel exhaust valve opens the exhaust channel in the direction of the inside of the chamber, allowing gas to enter the chamber. If not, it enters the negative pressure preservation chamber control mode.

[0019] S2: The control module determines whether the air pressure inside the negative pressure preservation chamber is higher than the system preset value P0. If so, the negative pressure vacuum pump starts to work, and the dual-channel exhaust valve opens the exhaust channel outside the chamber, allowing the gas to be discharged outside the chamber. If not, the negative pressure vacuum pump stops working.

[0020] In summary, the present invention has the following beneficial effects:

[0021] The control module receives data from the pressure sensor to precisely control the air pressure inside and outside the chamber, reducing errors and making the control more accurate. When the pressure difference between the inside and outside of the chamber exceeds 100Pa for 5 consecutive minutes, the control module controls the dual-channel exhaust valve to open exhaust port one, which connects to the inside of the chamber. This allows gas drawn from the negative pressure preservation chamber to enter the chamber, increasing the pressure inside until the pressure difference with the outside is kept at a low level, facilitating door opening. At the same time, the pressure inside the negative pressure preservation chamber decreases, resulting in better preservation. When it is necessary to further depressurize the negative pressure preservation chamber, the control module controls the dual-channel exhaust valve to open exhaust port two, which connects to the outside of the chamber, allowing gas to escape to the outside. Using the same system, negative pressure preservation and air pressure balance control are combined, resulting in a simple structure, ease of use, and a good user experience. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the installation of a negative pressure preservation and air pressure balance device for a refrigeration equipment according to the present invention;

[0023] Figure 2 A schematic diagram of a negative pressure vacuum pump and a dual-channel exhaust valve;

[0024] Figure 3This is a schematic diagram of the working process of the control method of the negative pressure preservation and air pressure balance device for refrigeration equipment according to the present invention. Detailed Implementation

[0025] The invention will now be further described with reference to the accompanying drawings.

[0026] The orientations mentioned in this specification refer to the orientations of the negative pressure preservation and air pressure balance device and its control method for refrigeration equipment under normal operation, and do not limit the orientations during storage and transportation. They only represent relative positional relationships and do not represent absolute positional relationships.

[0027] like Figures 1 to 2 As shown, a negative pressure preservation and air pressure balance device for refrigeration equipment includes a housing 1, inside which is a negative pressure preservation chamber 4, a negative pressure vacuum pump 2, and a dual-channel exhaust valve 3. It also includes an air pressure sensor for monitoring air pressure and a control module. The negative pressure vacuum pump 2 is used to extract gas from the negative pressure preservation chamber 4 to either the inside or outside of the housing 1, maintaining air pressure balance inside and outside the housing 1 for easy door opening. Simultaneously, it maintains a negative pressure state inside the negative pressure preservation chamber 4, extending the food preservation time. The negative pressure vacuum pump 2 is equipped with a dual-channel exhaust valve 3. The air inlet 9 is connected to the negative pressure preservation chamber 4, the exhaust port 10 of the dual-channel exhaust valve 3 is connected to the inside of the chamber 1, and the exhaust port 11 of the dual-channel exhaust valve 3 is connected to the outside of the chamber 1; the dual-channel exhaust valve 3 is used to control the gas extracted by the negative pressure vacuum pump 2 and discharge it to the inside or outside of the chamber 1; the negative pressure vacuum pump 2, the dual-channel exhaust valve 3 and the air pressure sensor are electrically connected to the control module; the control module is used to collect and process the data from the air pressure sensor, and control the start and stop of the negative pressure vacuum pump 2 and the opening direction of the exhaust port of the dual-channel exhaust valve 3 according to the value.

[0028] Furthermore, the pressure sensors include a negative pressure chamber pressure sensor 5 located inside the negative pressure preservation chamber 4, a box-type pressure sensor 6 located inside the refrigeration equipment, and an external box-type pressure sensor 7 located outside the box, which are used to monitor the pressure inside the negative pressure preservation chamber 4, the refrigeration equipment box 1, and the refrigeration equipment box 1, respectively, and feed the pressure back to the control module.

[0029] Furthermore, the air inlet 9 is equipped with a one-way valve 12, which is used to prevent gas from flowing back into the negative pressure preservation chamber 4.

[0030] Furthermore, the negative pressure preservation chamber 4 also includes a pressure relief valve 8, which is connected to the control module. When it is necessary to open the negative pressure preservation chamber 4, the pressure relief valve 8 is controlled by the control module to release the pressure in the negative pressure preservation chamber 4. When the air pressure inside the negative pressure preservation chamber 4 is the same as that outside, the negative pressure preservation chamber 4 can be opened to take out and put in items.

[0031] Furthermore, it also includes a display terminal, which is an LCD touch screen. The display terminal is connected to the control module. The internal temperature and air pressure of the refrigeration equipment can be observed through the display terminal. The temperature can also be set through the LCD touch screen, and the opening of the pressure relief valve 8 can be controlled.

[0032] Furthermore, it also includes a wireless port that can connect to a mobile phone, enabling remote control of the cooling equipment via the mobile phone.

[0033] like Figure 3 As shown, a control method for a negative pressure preservation and air pressure balance device in a refrigeration equipment includes the following steps:

[0034] S1: When the door is closed and the power is on, the air pressure sensor collects air pressure values. The control module calculates the pressure difference between the inside and outside of the chamber 1 and determines whether the pressure difference between the inside and outside of the chamber 1 is greater than 100Pa for 5 consecutive minutes. If so, the negative pressure vacuum pump 2 starts to work, and the dual-channel exhaust valve 3 opens the exhaust channel in the direction of the inside of the chamber 1, and the gas enters the chamber 1. If not, the negative pressure preservation chamber 4 control mode is entered.

[0035] S2: The control module determines whether the air pressure value inside the negative pressure preservation chamber 4 is higher than the system preset value P0. If so, the negative pressure vacuum pump 2 starts to work. At this time, the dual-channel exhaust valve 3 opens the exhaust channel in the direction of the outer side of the chamber 1, and the gas is discharged outside the chamber 1. If not, the negative pressure vacuum pump 2 stops working.

[0036] The control module controls the pressure difference between the inside and outside of chamber 1 as follows: It collects air pressure data from the internal and external air pressure sensors of chamber 1 in real time, compares the same set of data, and continues collecting the next set of data when the difference is less than or equal to 100 Pa; when the difference is greater than 100 Pa, a timer starts counting and continues collecting air pressure data from the internal and external air pressure sensors of chamber 1, and continues comparing the data. When the difference is greater than 100 Pa for 5 consecutive minutes, the timer stops and resets to zero, and simultaneously, the negative pressure vacuum pump 2 starts working, with dual-channel exhaust... When valve 3 opens the exhaust port 10, which is connected to the inside of the chamber 1, the gas in the negative pressure preservation chamber 4 is drawn into the chamber 1, and the air pressure inside the chamber 1 gradually rises, thus completing one air pressure balancing cycle. The control module continues to collect air pressure data from the air pressure sensors inside and outside the chamber 1 and enters the next cycle. Until the difference is less than or equal to 100Pa, the timer stops and is reset to zero, and the pressure difference inside and outside the chamber 1 is maintained at less than 100Pa, making it convenient for the user to open the door. At the same time, the control module enters the negative pressure preservation chamber 4 control mode.

[0037] The air pressure sensor inside the negative pressure preservation chamber 4 collects the air pressure value inside the chamber and transmits the value to the control module. The control module determines whether the air pressure value inside the negative pressure preservation chamber 4 is higher than the system preset value P0. If so, the negative pressure vacuum pump 2 starts to work, and the dual-channel exhaust valve 3 opens the exhaust port 11 connected to the outside of the chamber 1, drawing the gas inside the negative pressure preservation chamber 4 out of the chamber 1. The air pressure inside the negative pressure preservation chamber 4 gradually decreases, and the air pressure inside the negative pressure preservation chamber 4 continues to be monitored. This completes one cycle. When the air pressure value inside the negative pressure preservation chamber 4 is detected to be lower than the system preset value P0, the negative pressure vacuum pump 2 stops working. At this time, the air pressure value inside the negative pressure preservation chamber 4 is maintained below the system preset value P0 to ensure that the negative pressure preservation chamber 4 has a good preservation effect.

[0038] Of course, the above description is not intended to limit the present invention, and the present invention is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A control method for a negative pressure preservation and air pressure balance device in a refrigeration equipment, characterized in that: The negative pressure preservation and air pressure balance device includes a housing (1), which contains a negative pressure preservation chamber (4), a negative pressure vacuum pump (2), and a dual-channel exhaust valve (3). It also includes an air pressure sensor for monitoring air pressure and a control module. The negative pressure vacuum pump (2) is used to extract gas from the negative pressure preservation chamber (4). The negative pressure vacuum pump (2) is connected to the dual-channel exhaust valve (3). The air inlet (9) of the dual-channel exhaust valve (3) is connected to the negative pressure preservation chamber (4). The first exhaust port (10) of the dual-channel exhaust valve (3) is connected to the inside of the housing (1), and the second exhaust port (11) of the dual-channel exhaust valve (3) is connected to the outside of the housing (1). The negative pressure vacuum pump (2), the dual-channel exhaust valve (3) and the pressure sensor are electrically connected to the control module respectively; the control module is used to collect and process data from the pressure sensor, and control the start and stop of the negative pressure vacuum pump (2) and the opening direction of the outlet of the dual-channel exhaust valve (3) according to the value; the pressure sensor includes a negative pressure chamber pressure sensor (5) installed in the negative pressure preservation chamber (4), a box body pressure sensor (6) installed inside the refrigeration equipment, and a box body pressure sensor (7) installed outside the box body (1). The pressure sensor is used to monitor the pressure in the negative pressure preservation chamber (4), inside the refrigeration equipment box body (1) and outside the refrigeration equipment box body (1), and feed it back to the control module; The control method for the negative pressure preservation and air pressure balance device includes the following steps: S1: When the door is closed and the power is on, the air pressure sensor collects the air pressure value. The control module calculates the pressure difference between the inside and outside of the box (1) and determines whether the pressure difference between the inside and outside of the box (1) is greater than 100Pa for 5 consecutive minutes. If so, the negative pressure vacuum pump (2) starts to work, and the dual-channel exhaust valve (3) opens the exhaust channel in the direction of the box (1) so that the gas enters the box (1). If not, the negative pressure preservation chamber (4) control mode S2 is entered. S2: The control module determines whether the air pressure value inside the negative pressure preservation chamber (4) is higher than the system preset value P0. If so, the negative pressure vacuum pump (2) starts to work. At this time, the dual-channel exhaust valve (3) opens the exhaust channel in the direction of the box (1) and the gas is discharged outside the box (1). If not, the negative pressure vacuum pump (2) stops working.

2. The control method for a negative pressure preservation and pressure balance device for refrigeration equipment as described in claim 1, characterized in that: The air inlet (9) is equipped with a one-way valve (12).

3. The control method for a negative pressure preservation and pressure balance device for refrigeration equipment as described in claim 1, characterized in that: The negative pressure preservation chamber (4) is also equipped with a pressure relief valve (8) for relieving pressure in the negative pressure preservation chamber (4), and the pressure relief valve (8) is electrically connected to the control module.

4. The control method for a negative pressure preservation and pressure balance device for refrigeration equipment as described in claim 1, characterized in that: It also includes a display terminal, which is a liquid crystal touch screen, and the display terminal is connected to the control module.

5. The control method for a negative pressure preservation and air pressure balance device for refrigeration equipment as described in claim 1, characterized in that: It also includes a wireless port that can connect to a mobile phone, enabling remote control of the cooling equipment via the mobile phone.

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