Negative pressure refrigeration apparatus and pressure control method

Abstract

The present application relates to the technical field of refrigeration equipment, and provides a negative pressure refrigeration equipment, which comprises a box body, a negative pressure storage bin is arranged in the box body, the negative pressure storage bin is connected with a vacuum pump, the vacuum pump is connected with a branch exhaust valve, and the branch exhaust valve is provided with an inner exhaust channel and an outer exhaust channel which can be alternately connected and can exhaust air into the box body and exhaust air out of the box body. In this way, the present application can reduce the pressure difference between the inside and outside of the box by exhausting the gas in the negative pressure storage bin into the box, and can achieve the preservation storage of the goods by reaching a certain vacuum degree in the negative pressure storage bin. The present application also provides a pressure control method, which can realize the linkage adjustment of the vacuum degree of the negative pressure storage bin and the pressure in the box, and can improve the preservation capacity while reducing the pressure difference between the inside and outside of the box.

Description

Technical Field

[0001] This invention belongs to the field of refrigeration equipment technology, and particularly relates to a negative pressure refrigeration device and a pressure control method. Background Technology

[0002] When a refrigerator or freezer door is closed for an extended period, a pressure difference develops between the inside and outside, making it difficult to open. This is especially true with advancements in refrigeration technology, leading to the widespread availability of -40°C deep-freeze refrigerators, which further widen the pressure difference and increase the difficulty of opening the door.

[0003] The current solution is to introduce outside air into the refrigeration unit to balance the pressure difference between the inside and outside. However, the outside air temperature is high, and in deep-cooling conditions, a large influx of outside air causes the internal temperature to rise, increasing power consumption. Traditional power-assisted door handles, while improving opening force, cause mechanical wear to the cabinet over long-term use.

[0004] Furthermore, if the refrigeration equipment is in a state of large pressure difference between the inside and outside for a long time, it will cause problems such as door deformation or damage to the sealing structure.

[0005] In conclusion, the existing technology obviously has inconveniences and defects in practical use, so it is necessary to improve it. Summary of the Invention

[0006] To address the aforementioned shortcomings, this invention primarily provides a negative pressure refrigeration device, solving the technical problem of refrigeration equipment operating under excessive internal and external pressure differences for extended periods.

[0007] To address the aforementioned problems, the present invention provides a negative pressure refrigeration device, comprising a housing, wherein a negative pressure storage compartment is provided within the housing; the negative pressure storage compartment is connected to a vacuum pump.

[0008] The vacuum pump is connected to a branch exhaust valve; the branch exhaust valve has an internal exhaust channel that can be alternately opened to exhaust gas into the box and an external exhaust channel that exhausts gas into the box.

[0009] According to the negative pressure refrigeration equipment of the present invention, the vacuum pump and the branch exhaust valve are both located inside the housing; the housing is provided with an external exhaust pipe connected to the external exhaust channel; the exhaust end of the external exhaust pipe extends to the outside of the housing.

[0010] According to the negative pressure refrigeration equipment of the present invention, a one-way valve is provided on the wall or inside the negative pressure storage chamber, and the one-way valve is connected to a vacuum.

[0011] According to the negative pressure refrigeration equipment of the present invention, the valve body of the branch exhaust valve is provided with an air pipe channel; the valve body is also provided with an internal exhaust channel and an external exhaust channel, both of which are connected to the air pipe channel.

[0012] A vent pipe connected to a vacuum pump is slidably installed inside the vent pipe channel; two air outlets are opened on the side wall of the vent pipe, corresponding to the inner exhaust channel and the outer exhaust channel respectively; as the vent pipe slides inside the vent pipe channel, the inner exhaust channel and the outer exhaust channel alternately connect with the corresponding air outlets.

[0013] According to the negative pressure refrigeration device of the present invention, an electromagnet is provided at the top of the air pipe channel, and a magnetic suction head is provided at the end of the air pipe facing the electromagnet.

[0014] According to the negative pressure refrigeration device of the present invention, a guide groove is provided on the side wall of the air pipe channel, and a guide block correspondingly provided on the magnetic suction head is slidably engaged with the guide groove.

[0015] According to the negative pressure refrigeration equipment of the present invention, a pressure relief valve is provided on the wall of the negative pressure storage compartment.

[0016] According to the negative pressure refrigeration device of the present invention, the refrigeration device is a refrigerator or freezer.

[0017] According to the negative pressure refrigeration equipment of the present invention, an external pressure sensor and an internal pressure sensor are respectively provided on the outside and inside of the box; an internal pressure sensor is provided in the negative pressure storage compartment.

[0018] A pressure control method for pressure control of the aforementioned negative pressure refrigeration equipment includes: detecting the external atmospheric pressure, the pressure inside the chamber, and the pressure inside the negative pressure storage compartment; and selecting the following steps based on the detected values ​​and the following conditions:

[0019] Condition S1: When the pressure inside the negative pressure storage chamber exceeds the preset value, the vacuum pump starts to extract the gas from the negative pressure storage chamber.

[0020] Condition S2: When the pressure inside the negative pressure storage compartment reaches or falls below the preset value, the vacuum pump stops.

[0021] When condition S1 is met:

[0022] When the pressure difference between the chamber and the external atmospheric pressure exceeds the preset value, or when the operating time exceeds the preset value for a predetermined duration, the internal exhaust channel of the branch exhaust valve is opened and the external exhaust channel is closed; the gas extracted from the vacuum pump is sent into the chamber.

[0023] When the pressure difference between the chamber and the external atmospheric pressure reaches zero, the external exhaust duct of the branch exhaust valve is opened and the internal exhaust duct is closed; the vacuum pump discharges the extracted gas into the external atmosphere through the external exhaust duct.

[0024] When condition S2 is met:

[0025] When the pressure difference between the chamber and the external atmospheric pressure exceeds the preset value, or when the operating time exceeds the preset value for a predetermined duration, the external exhaust duct of the branch exhaust valve is opened.

[0026] When the pressure difference between the chamber and the external atmospheric pressure is lower than the preset value or reaches zero, the external exhaust duct of the branch exhaust valve closes and the internal exhaust duct opens.

[0027] In summary, this invention provides a negative pressure refrigeration device that reduces the pressure difference between the inside and outside of the container by extracting gas from the negative pressure storage chamber and releasing it into the main body of the container. Simultaneously, a certain degree of vacuum is achieved within the negative pressure storage chamber, thus enabling the preservation and storage of goods. This invention also provides a pressure control method that achieves coordinated adjustment between the vacuum level of the negative pressure storage chamber and the pressure inside the container, improving preservation capabilities while reducing the pressure difference between the inside and outside of the container. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of the present invention;

[0029] Figure 2 yes Figure 1 Schematic diagram of the structure of region A in the middle;

[0030] Figure 3 This is a schematic diagram of the working state of the branch exhaust valve of the present invention;

[0031] Figure 4 yes Figure 3 Schematic diagram of the structure of region B in the middle;

[0032] Figure 5 This is a schematic diagram of the working state of the branch exhaust valve of the present invention;

[0033] In the diagram: 1-Box body, 11-Negative pressure storage compartment, 12-External air pressure sensor, 13-Internal air pressure sensor, 14-Internal air pressure sensor, 15-External exhaust pipe; 2-Vacuum pump, 21-One-way valve; 3-Diverter exhaust valve, 31-Internal exhaust duct, 32-External exhaust duct, 33-Ventilation pipe, 331-Air outlet, 332-Magnetic head, 333-Guide block; 34-Electromagnet, 35-Guide groove. Detailed Implementation

[0034] See Figure 1 This invention provides a negative pressure refrigeration device, including a housing 1, wherein a negative pressure storage compartment 11 is provided inside the housing 1; see also Figure 2 The negative pressure storage chamber 11 is connected to a vacuum pump 2; the vacuum pump 2 draws gas from the negative pressure storage chamber 11 to achieve a certain vacuum level, which meets the requirements for freshness preservation.

[0035] The vacuum pump 2 is connected to the branch exhaust valve 3; see also Figure 3 The branch exhaust valve 3 has an internal exhaust channel 31 for exhausting into the housing 1 and an external exhaust channel 32 for exhausting out of the housing 1; the internal exhaust channel 31 and the external exhaust channel 32 can be alternately connected;

[0036] The gas drawn from the negative pressure storage chamber 11 can be discharged into the interior of the cabinet 1 through the internal exhaust duct 31; this reduces the pressure difference between the inside and outside of the cabinet, keeping the refrigeration equipment in a state of internal and external pressure balance, and preventing deformation and damage caused by pressure differences. The gas drawn from the negative pressure storage chamber 11 is a low-temperature gas, which will not cause the temperature inside the cabinet to rise, thus avoiding increased energy consumption.

[0037] Excess gas can be discharged into the atmosphere through the external exhaust duct 32 to avoid situations where the pressure inside the chamber is greater than the pressure outside the chamber, resulting in poor sealing or the door opening automatically.

[0038] This invention reduces the pressure difference between the inside and outside of the box by extracting the gas from the negative pressure storage chamber 11 and releasing it into the box, while achieving a certain degree of vacuum in the negative pressure storage chamber 11, thus achieving the preservation and storage of items.

[0039] Even better, the negative pressure storage compartment 11 is equipped with a one-way valve 21 on the wall or inside the compartment, and the one-way valve 21 is connected to the vacuum pump 2; to prevent the gas inside the compartment from being sucked in under negative pressure conditions, thus avoiding an increase in the vacuum level.

[0040] Furthermore, the vacuum pump 2 and the branch exhaust valve 3 are both located inside the housing 1; the extracted low-temperature gas is directly discharged into the housing 1 without causing temperature fluctuations; the housing 1 is provided with an external exhaust pipe 15 connected to the external exhaust channel 32; the outlet end of the external exhaust pipe 15 extends to the outside of the housing 1.

[0041] See Figure 3 and Figure 4 As one embodiment of the branch exhaust valve 3, the branch exhaust valve 3 has an air pipe channel in its valve body; the valve body also has an inner exhaust channel 31 and an outer exhaust channel 32, both of which are connected to the air pipe channel.

[0042] A vent pipe 33 connected to the vacuum pump 2 is slidably disposed within the vent passage; two vent holes 331 are provided on the side wall of the vent pipe 33; the two vent holes 331 respectively face the inner exhaust passage 31 or the outer exhaust passage 32; combined with Figure 5 As the ventilator 33 slides within the ventilator channel, the internal exhaust channel 31 and the external exhaust channel 32 alternately connect with the corresponding exhaust port 331, thus achieving controllable switching of the exhaust passage.

[0043] In one embodiment, an electromagnet 34 is provided at the top of the tracheal passage, and a magnetic suction head 332 is provided at the end of the ventilation tube 33 facing the electromagnet 34; by controlling the magnitude of the current in the coil of the electromagnet 34, the sliding direction and movement range of the ventilation tube 33 in the tracheal passage are controlled.

[0044] See Figure 4 Even better, a guide groove 35 is provided on the side wall of the air duct, and a guide block 333 is provided on the magnetic suction head 332 to slide in cooperation with the guide groove 35; the cooperation between the guide block 333 and the guide groove 35 prevents the air duct 33 from rotating, which would cause the air outlet 331 to be misaligned with the inner exhaust channel 31 or the outer exhaust channel 32.

[0045] The present invention can set the length of the guide groove 35. When the electromagnet 34 and the magnetic head 332 are attracted, the guide block 333 abuts against the upper inner wall of the guide groove 35, and the internal exhaust channel 31 is connected to the corresponding air outlet 331.

[0046] When the electromagnet 34 separates from the magnetic head 332, the vent pipe 33 slides down under the action of gravity, and the guide block 333 abuts against the lower inner wall of the guide groove 35. At this time, the external exhaust channel 32 is connected to the air outlet 331.

[0047] By using the guide groove 35 to limit the working position of the vent pipe 33, the stability and accuracy of the exhaust channel switching control are improved.

[0048] As one embodiment, the outer and inner sides of the housing 1 are respectively equipped with an external air pressure sensor 12 and an internal air pressure sensor 13; this allows for control of the airway switching of the branch exhaust valve 3 based on the specific value of the pressure difference between the inside and outside of the housing. An internal air pressure sensor 14 is installed inside the negative pressure storage compartment 11; this detects the pressure value inside the negative pressure storage compartment 11 and controls the start and stop of the vacuum pump 2, achieving precise control.

[0049] Even better, the negative pressure storage compartment 11 is equipped with a pressure relief valve on its wall; pressing the pressure relief valve allows gas to enter the negative pressure storage compartment 11, making it easy to open.

[0050] When the vacuum level in the negative pressure storage chamber 11 meets the preset requirements and the pressure in the chamber 1 is low, the external exhaust duct 32 of the branch exhaust valve 3 is opened, and the vacuum pump 2 stops working. External gas enters the vacuum pump 2 through the external exhaust duct 32 and enters the chamber 1 through the internal channel of the vacuum pump 2 to balance the internal and external pressure difference.

[0051] The refrigeration equipment of the present invention is a refrigerator or freezer.

[0052] The present invention also provides a pressure control method, comprising:

[0053] Detect the external atmospheric pressure, the pressure inside box 1, and the pressure inside negative pressure storage compartment 11; based on the detected values, perform the following steps;

[0054] Condition S1: When the pressure inside the negative pressure storage chamber 11 exceeds a preset value, the vacuum pump 2 is activated to extract the gas from the negative pressure storage chamber 11; the preset pressure value inside the negative pressure storage chamber 11 of the present invention is 50 Pa.

[0055] Condition S2: When the pressure inside the negative pressure storage chamber 11 reaches or falls below the preset value, the vacuum pump 2 stops.

[0056] When condition S1 is satisfied:

[0057] When the pressure difference between the chamber 1 and the external atmospheric pressure exceeds the preset value, such as exceeding 100Pa; or exceeds the preset value for a predetermined time, such as reaching or exceeding 5 minutes, the internal exhaust channel 31 of the branch exhaust valve 3 is opened and the external exhaust channel 32 is closed; the gas extracted from the vacuum pump 2 is sent into the chamber 1.

[0058] When the pressure difference between the chamber 1 and the external atmospheric pressure reaches zero, the external exhaust duct 32 of the branch exhaust valve 3 is opened and the internal exhaust duct 31 is closed; the vacuum pump 2 discharges the extracted gas into the external atmosphere through the external exhaust duct 32.

[0059] When condition S2 is satisfied:

[0060] When the pressure difference between the chamber 1 and the external atmospheric pressure exceeds the preset value, or exceeds the preset value for a predetermined time, the external exhaust duct 32 of the branch exhaust valve 3 is opened; external gas enters the vacuum pump 2 through the external exhaust duct 32 and enters the chamber 1 through the internal channel of the vacuum pump 2.

[0061] When the pressure difference between the chamber 1 and the external atmospheric pressure is lower than the preset value or reaches zero, the external exhaust passage 32 of the branch exhaust valve 3 is closed, and the internal exhaust passage 31 is opened.

[0062] The pressure control method of this invention realizes the linkage adjustment between the vacuum degree of the negative pressure storage compartment and the internal pressure of the compartment, thereby improving the preservation ability while reducing the pressure difference between the inside and outside of the compartment.

[0063] In summary, this invention provides a negative pressure refrigeration device that reduces the pressure difference between the inside and outside of the container by extracting gas from the negative pressure storage chamber and releasing it into the main body of the container. Simultaneously, a certain degree of vacuum is achieved within the negative pressure storage chamber, thus enabling the preservation and storage of goods. This invention also provides a pressure control method that achieves coordinated adjustment between the vacuum level of the negative pressure storage chamber and the pressure inside the container, improving preservation capabilities while reducing the pressure difference between the inside and outside of the container.

[0064] Of course, the present invention may have other various embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and modifications according to the present invention, but these corresponding changes and modifications should all fall within the protection scope of the appended claims.

Claims

1. A pressure control method for a negative pressure refrigeration device, characterized in that, The negative pressure refrigeration equipment includes a housing, and a negative pressure storage compartment is provided inside the housing; the negative pressure storage compartment is connected to a vacuum pump; The vacuum pump is connected to a branch exhaust valve; the branch exhaust valve has an internal exhaust channel that can be alternately opened to exhaust air into the box outside the negative pressure storage compartment and an external exhaust channel that exhausts air into the box outside. The vacuum pump and branch exhaust valve are both located inside the housing; the housing is equipped with an external exhaust pipe that connects to the external exhaust channel; the outlet end of the external exhaust pipe extends to the outside of the housing. The valve body of the branch exhaust valve is provided with an air pipe channel; the valve body is also provided with an internal exhaust channel and an external exhaust channel, both of which are connected to the air pipe channel. A vent pipe connected to a vacuum pump is slidably provided inside the vent pipe channel; an air outlet corresponding to the internal exhaust channel and an air outlet corresponding to the external exhaust channel are opened on the side wall of the vent pipe. As the ventilation tube slides within the tracheal passage, the internal and external exhaust channels alternately connect with the corresponding air outlets. An electromagnet is provided at the top of the tracheal passage, and a magnetic suction head is provided at the end of the ventilator facing the electromagnet. A guide groove is provided on the side wall of the air duct, and a guide block is provided on the magnetic suction head to slide in cooperation with the guide groove; an external air pressure sensor and an internal air pressure sensor are respectively provided on the outside and inside of the box; an internal air pressure sensor is provided in the negative pressure storage compartment. The pressure control method includes: detecting the external atmospheric pressure, the pressure inside the box outside the negative pressure storage compartment, and the pressure inside the negative pressure storage compartment; and selecting the following steps based on the detected values ​​and the following conditions: Condition S1: When the pressure inside the negative pressure storage chamber exceeds the preset value, the vacuum pump starts to extract the gas from the negative pressure storage chamber. Condition S2: When the pressure inside the negative pressure storage compartment reaches or falls below the preset value, the vacuum pump stops. When condition S1 is met: When the pressure difference between the box inside the negative pressure storage chamber and the external atmospheric pressure exceeds the preset value, the internal exhaust channel of the branch exhaust valve is opened and the external exhaust channel is closed; the gas extracted from the vacuum pump is sent into the box outside the negative pressure storage chamber. When the pressure difference between the box inside the negative pressure storage compartment and the external atmospheric pressure reaches zero, the external exhaust duct of the branch exhaust valve is opened and the internal exhaust duct is closed; the vacuum pump discharges the extracted gas into the external atmosphere through the external exhaust duct. When condition S2 is met: When the pressure difference between the chamber and the external atmospheric pressure exceeds the preset value, the external exhaust duct of the branch exhaust valve is opened; When the pressure difference between the box inside the negative pressure storage compartment and the external atmospheric pressure is lower than the preset value or reaches zero, the external exhaust duct of the branch exhaust valve is closed, and the internal exhaust duct is opened.

2. The pressure control method for the negative pressure refrigeration equipment as described in claim 1, characterized in that, The negative pressure storage chamber is equipped with a one-way valve on its wall or inside, and the one-way valve is connected to a vacuum pump.

3. The pressure control method for the negative pressure refrigeration equipment as described in claim 1, characterized in that, The negative pressure storage compartment is equipped with a pressure relief valve on its wall.

4. The pressure control method for the negative pressure refrigeration equipment as described in claim 1, characterized in that, The refrigeration equipment is a refrigerator or freezer.

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