Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
  • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
  • F25D17/00—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
  • F25D17/04—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection
  • F25D17/042—Air treating means within refrigerated spaces
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
  • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
  • F25D2317/00—Details or arrangements for circulating cooling fluids; Details or arrangements for circulating gas, e.g. air, within refrigerated spaces, not provided for in other groups of this subclass
  • F25D2317/04—Treating air flowing to refrigeration compartments
  • F25D2317/043—Treating air flowing to refrigeration compartments by creating a vacuum in a storage compartment

Definitions

• This invention relates to a vacuum system and is primarily concerned with a vacuum refresh system having control methods for home appliances, especially electric refrigerators.
• the length of the shelf life of the food is not only determined by the temperature and humidity, but is also influenced by factors such as oxygen content and airborne bacteria in the environment of the food storage. In order to achieve an even longer shelf life of the food, it is desirable to provide a storage environment with low oxygen content and low bacterial load, such as a vacuum fresh food can.
• FIG. ZL03245813.4 discloses a vacuum keeping system installed in the refrigerated storage room of an electric refrigerator, as shown in Figure 1 ( Figure 1 according to Annex Figure 1 of the specification of Chinese Patent No. ZL03245813.4).
• This vacuum refreshment system comprises a fruit and vegetable can 3, which is mounted in the cold storage room of the refrigerator.
• the fruit and vegetable can is successively via a suction nozzle 4, a guide tube 2, a
• the vacuum pump 1 is connected to an evacuation controller 16.
• the control valve for the air supply 8 is a check valve. After the vacuum pump 1 stops its operation, this check valve prevents the ingress of outside air into the guide tube 2 and the fruit and vegetable can 3, thereby maintaining the vacuum seal of the system. However, since the fruit and vegetable can 3 and the guide tube 2 via a
• Suction nozzle 4 are connected to each other, it is hardly avoidable between the two that there is a gap at which a leak occurs.
• the vacuum pump 1 After the vacuum pump 1 has stopped its operation, the outside air can enter through the gap in the fruit and vegetable can 3, resulting in a gradual reduction of the vacuum level of the fruit and vegetable can 3, whereby the entire system loses the vacuum seal.
• the gap between the fruit and vegetable can 3 and the guide tube 2 is very small during evacuation, it is hardly avoidable for the user to open the fruit and vegetable can 3 when opening the refrigerator and performing other actions. resulting in a separation of fruit and vegetable can 3 and guide tube 2, resulting in a loss of the vacuum seal for the fruit and vegetable can 3 result.
• the object of this invention is to provide an improved vacuum refueling system.
• This evacuation system will be able to automatically realize the vacuum seal for the can after evacuation.
• a further object of this invention is to provide a control method for a vacuum refueling system.
• a vacuum refueling system of a method of this invention comprises a can having over a suction device and a ventilation device has, and a
• Suction pipe One end of the suction pipe is connected to a vacuum pump, and the other end is separably connected to the suction device of the can via a connecting piece. Also included are a vacuum gauge for measuring the vacuum level and a controller for controlling the vacuum holding system, and a switching device connected to the suction pipe. This switching device is during the evacuation of the can by the vacuum pump via the suction pipe in the closed position and prevents the ingress of outside air into the suction pipe. Upon completion of the evacuation by the vacuum pump, it is in the open position to direct air into the already evacuated exhaust pipe.
• the described switching device is a check valve.
• the described vacuum gauge is a vacuum sensor connected to the suction tube.
• the described control device comprises a circuit board and a control panel, the described control panel comprising a push-button start and a push-button warning.
• This invention also provides a control method for a vacuum keeping system, which vacuum keeping system comprises a can having a suction device and a ventilation device, and a suction pipe. One end of the suction pipe is connected to a device for evacuation and the other end is separable via a connecting piece with connected to the suction device of the box. It also includes one
• Vacuum measuring device and a control device.
• This control method includes the following steps:
• Control device starts the evacuation device which starts evacuating the can
• Vacuum gauge measures the vacuum level of the system and provides feedback to the controller
• the control device stops the evacuation device in accordance with the feedback from the vacuum gauge device
• the described switching device is a check valve.
• the described vacuum gauge device is a vacuum sensor connected to the exhaust duct.
• the described device for evacuation is a vacuum pump.
• the described control device comprises a circuit board and a control panel, the described control panel comprising a push-button start and a push-button warning.
• the efficiency of this invention consists in the following: by the attachment of a
• the outside air can be passed after the evacuation of the vacuum system in the suction pipe. Due to the pressure difference between the suction pipe and the evacuated can, the automatic sealing of the can is realized and prevents leakage caused by the vacuum level of the can.
• Fig. 1 shows the scheme of a vacuum system of a commercial refrigerator.
• Fig. 2 shows the scheme of the vacuum refueling system of one method of this invention.
• Fig. 3 shows the flow chart for the control method of the vacuum keeping system of this invention.
• Fig. 4 shows the spatial scheme of the can of the vacuum refill system of one method of this invention.
• the vacuum refueling system of one embodiment of this invention includes a can 20 with one end of the can 20 provided with a vent 21 and the other end with a vent 22.
• the ventilation device 21 and the suction device 22 may be non-return valves.
• the can 20 is connected to this exhaust duct 24 via a connection device 23, which is mounted on one end of the can 20 and on one end of the suction duct 24, respectively.
• the suction pipe 24 may be a copper pipe or a plastic pipe. Its nature must give the pipeline a very good airtightness.
• the other end of the exhaust duct 24 is connected to the evacuation device 26, for example a vacuum pump. In order to reduce the noise during the operation of the evacuation device 26, a noise removal device 27 is mounted on the vacuum pump.
• a four-way connector 31 is attached. This four-way connector is connected to the switching device 25 and the vacuum gauge 29.
• Procedure is in the switching device 25 is a check valve.
• this check valve When this check valve is in the closed position, the outside air is prevented from entering the suction pipe 24.
• this check valve is in the open position, the outside air is passed into the suction pipe 24 at a certain flow rate. In this
• the vacuum gauge 29 is a vacuum sensor that can measure changes in the vacuum level in the exhaust conduit 24.
• the changes in the vacuum level in the evacuation conduit 24 due to the connection of the evacuation conduit 24 and can 20 to changes in the vacuum level in the evacuation conduit 24 are the changes in the vacuum level in the can 20.
• the vacuum refresh system also has a control device.
• This control device includes a circuit board 28 and a control panel 32.
• the circuit board 28 is connected to the switching device 25, the evacuation device 26, the vacuum gauge 29, and the control panel 32, receives feedback signals from these devices, and issues appropriate commands.
• a push-button start 32 and a push-button warning 34 are attached on the control panel 32.
• the role of the push button Start 32 is to start the evacuation device.
• the role of the push button warning 34 is to
• the steps of the vacuum control system control method of this invention are as follows: First, the user on the switchboard 32 actuates the pushbutton Start 32 and starts the process of evacuation.
• the circuit board 28 judges the position of the switching device 25. When the switching device 25 is in the open position, the circuit board 28 gives the command to switch the switching device to the closed position. Subsequently, the circuit board 28 gives the command to start the evacuation device 26, which begins with the evacuation of the can 20 via the suction pipe 24.
• the vacuum gauge 29 continuously measures the vacuum level in the suction duct 24 and reports the measured values to the circuit board 28.
• the control card 28 issues a command indicating the operation of the apparatus Evacuation 26 is maintained. After a certain time, when the vacuum level in the exhaust duct 24 has reached the set value set previously, the circuit board 28 issues a command that stops the operation of the evacuation device 26. Last, after stopping the operation of the evacuation device 26, the circuit board 28 issues a command which switches the switching device 25 from the closed position to the open position and introduces the outside air into the exhaust pipe 24 at a certain flow rate. This completes the process of evacuation.
• the can 20 includes a base 204 and a lid 202 which closes the base 204.
• the ventilation device 21 and the suction device 22 are respectively attached to the two ends of the lid 202.
• the connecting device 23 on the cover 202 is connected to the suction device 22.
• the switching device 25 flows open position the outside air in the suction pipe 24 and over the
• Extractor 22 is described in detail in another Chinese patent application for an invention of this Applicant entitled "Vacuum Refresh Box and Home Appliances Using This Vacuum Refractory Box", for which reason a further description will be omitted here. Since the vacuum seal point of the can 20 is the location of the aspirator 22 on the lid 202, even if there is a leak or slack at the location of the connector 23, the air may only enter the connector 23 and the aspirator tubing 24 but not in the can 20. The vacuum seal of the can 20 is not affected by the occurrence of leaks on the connector 23 and on the suction pipe 24.
• the vacuum refreshment system of this invention may be used individually, may also be mounted in household electrical appliances and used as an accessory. In particular, it can be installed in household electric refrigerators or in freezers.
• the can 20 can be used in the cold storage room of the refrigerator.
• the suction pipe 24 can be sunk in the foam layer of the box of the refrigerator.
• the connecting piece 23 connected to the suction pipe 24 can be mounted on the inner wall of the cold storage room.
• the control panel 32 may be mounted on the door of the refrigerator or the inner wall of the cold storage room to allow easy operation by the user.
• the switching device 25 of the procedure in Figure 2 of this invention may be a check valve.
• it can also be another commercially available switching device, as long as the function can be realized to initiate the open air in the open position and seal the suction pipe 24 in the closed position.
• the position of the vacuum gauge 29, for example it may be connected to the exhaust pipe 24 or may be mounted on the can 20 as long as the function of realizing the changes in the vacuum level of the vacuum system can be realized.

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• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Physics & Mathematics (AREA)
• Mechanical Engineering (AREA)
• Thermal Sciences (AREA)
• General Engineering & Computer Science (AREA)
• Cold Air Circulating Systems And Constructional Details In Refrigerators (AREA)
• Devices That Are Associated With Refrigeration Equipment (AREA)
• Vacuum Packaging (AREA)

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Citations (7)

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• 2007
  • 2007-06-28 CN CN2007100247574A patent/CN101331970B/zh active Active
• 2008
  • 2008-06-18 EP EP08761155.4A patent/EP2162690B1/de active Active
  • 2008-06-18 WO PCT/EP2008/057701 patent/WO2009000724A1/de active Application Filing
  • 2008-06-18 CN CN200880022439A patent/CN101688724A/zh active Pending
  • 2008-06-18 RU RU2010101157/13A patent/RU2470239C2/ru not_active IP Right Cessation

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