Central vacuum system

Abstract

A central vacuum system, in particular to a household central vacuum system, comprising an outdoor main unit, a fixed piping system, wall inlets, a retractable inflatable hose, a dust collector tank, an air pump, a straight pipe, a handle, a dust suction head, etc. The dust collector tank can separate and store garbage; the retractable inflatable hose is formed by overlapping a plurality of annular film air bags, or is formed by helically winding at least one helical film hose, of which adjacent sides are connected to each other, and the retractable inflatable hose can be extended and retracted by inflating air from an inflatable interface by means of the air pump or by suctioning air by means of a switching valve. The present invention can achieve: no secondary dust pollution, low noise, easy to clean, light handheld part, convenient to move, fast retraction speed of an indoor hose, small size and light weight after retraction, and easy to move, store and transport, and original central vacuum systems can also be updated and modified at minimal cost.

Description

A central vacuum system TECHNICAL FIELD

[0001] The present invention relates to a central vacuum system with a movable suction head, in particular a domestic central vacuum system. BACKGROUND

[0002] The motor, fan and filter in the central vacuum system are arranged outdoors and connected with the suction head through fixed pipes, wall interfaces, hoses, handles and straight pipes to generate negative pressure at the suction head to suck in garbage. The central vacuum system has the advantages of large main machine power, large filter area, small indoor noise, easy cleaning and no secondary dust pollution, but the hose needs to ensure that the suction head can serve any corner of all rooms and has sufficient airflow passage area and can withstand high negative pressure, and also needs to withstand the abrasion caused by high-speed moving garbage. Therefore, the hose is long, thick and heavy, which brings inconvenience to cleaning operation and storage, directly leading many users to abandon the existing domestic central vacuum system and use handheld domestic vacuum cleaners. In order to overcome this shortcoming, US patent US 20020013974A1 and Japanese patent JP2014045931A disclose a telescopic inflatable hose with a spiral spring supported spiral air duct solution, but both solutions do not filter the air entering the inflatable hose, which cannot avoid the phenomenon that some sharp garbage will damage the hose under the driving of high-speed airflow. The two solutions also have two other shortcomings, the first is that when the air in the inflatable hose is sucked out by negative pressure, the air passage at the bending part of the inflatable hose will be unsmooth, leading to time-consuming and laborious contraction of the inflatable hose; the second is that the spiral springs of the inflatable hose will overlap after contraction, leading to a longer length and heavier weight of the contracted inflatable hose. French patent FR2823431A1 discloses an inflatable hose solution without spiral spring support, which also has the phenomena of sharp garbage damaging the hose and unsmooth air passage when the inflatable hose is contracted, and also has the phenomenon of constant axial length after contraction of the inflatable hose, affecting storage. TECHNICAL PROBLEM

[0003] The technical problem to be solved by the present invention is to overcome the shortcomings of the existing central vacuum system that the indoor hose is relatively heavy and inconvenient to move and store, and to provide a central vacuum system with the advantages of no secondary dust pollution, small indoor noise, light indoor hose, easy cleaning, and convenient movement and storage. TECHNICAL SOLUTION

[0004] In order to solve the above technical problems, the present invention is realized by the following technical scheme:

[0005] A central vacuum system includes an outdoor unit, fixed piping, a wall interface, a flexible hose, a straight hose, a handle, and a vacuum head. Its distinguishing feature is that a dust collection bin, capable of separating and storing debris, is located between the vacuum head and the flexible hose. The flexible hose between the wall interface and the dust collection bin is a retractable inflatable hose composed of multiple overlapping annular film airbags. The overlapping annular film airbags have interconnected annular regions on adjacent sides. At least one end of the retractable inflatable hose has an inflation port for inflation or deflation. Each interconnected annular region of the overlapping annular film airbags has vents in the same location. The air vents are connected to form a cavity to create a retractable inflatable hose. The air pump is connected to the inflation port at one end of the airbag via a valve at the handle or dust collection bin, or the air pump is inside the outdoor unit and connected to the inflation port at the other end of the airbag via a valve and inflation hose at the wall interface. The air pump can control the extension and shortening of the overlapping annular film airbag by inflating through the inflation port or by drawing air through switching valves. There are switches on the handle to control the start and stop of the outdoor unit and air pump, as well as switches to control the start, stop and switch of the valves. There is a pressure switch at the outdoor unit or wall interface, which can stop the outdoor unit when the negative pressure is too low.

[0006] A central vacuum system includes an outdoor unit, fixed pipes, a wall interface, a flexible hose, a straight pipe, a handle, and a vacuum head. Its features include: a dust collection bin for separating and storing debris between the vacuum head and the flexible hose; a retractable inflatable hose formed by spirally winding at least one helical membrane hose connected to each other on both sides; both ends of the helical membrane hose are closed, with at least one end having an inflation port for inflation or deflation; vent holes at the same position on the front and back of the interconnected helical regions of the helical membrane hoses; an air pump connected to the inflation port at one end via a valve at the handle or dust collection bin, or the air pump connected to the inflation port at the wall interface via a valve and an inflation hose inside the outdoor unit; the extension and retraction of the helical membrane hose can be controlled by the air pump inflating through the inflation port or by switching the valve; a switch on the handle for controlling the start and stop of the outdoor unit and the air pump, as well as a switch for controlling the start, stop, and switch of the valve; and a pressure switch on the outdoor unit or wall interface to pause the outdoor unit when the negative pressure is too low.

[0007] The retractable inflatable hose has an internal ring-shaped frame of different diameters for support.

[0008] The retractable inflatable hose is supported by a spiral skeleton of different diameters.

[0009] One end of the retractable inflatable hose has a sleeve, and one end of the sleeve has multiple elastic baffles arranged in a ring around the retractable hose. Inside the sleeve is a pressure switch that can control the start and stop of the outdoor unit. The other end of the sleeve has an opening and a short pipe that connects the retractable inflatable hose to the wall interface.

[0010] The air holes of the annular film air bag have the same diameter and are overlapped together, each group of the overlapped air holes is inserted into an air pipe with a diameter slightly larger than the diameter of the air holes, the length of the air pipe is less than the thickness of the overlapped annular film air bags, and all the air pipes are connected with the inflation interface and then connected with the air pump.

[0011] The air holes of the annular film air bag have the same diameter and are overlapped together, each group of the overlapped air holes is inserted into an air pipe with a diameter slightly larger than the diameter of the air holes, the length of the air pipe is less than the thickness of the overlapped annular film air bags, and all the air pipes are connected with the inflation interface and then connected with the air pump.

[0012] The air holes of the annular film air bag have the same diameter and are overlapped together, each group of the overlapped air holes is inserted into an air pipe with a diameter slightly larger than the diameter of the air holes, the length of the air pipe is less than the thickness of the overlapped annular film air bags, and all the air pipes are connected with the inflation interface and then connected with the air pump.

[0013] The air holes of the annular film air bag have the same diameter and are overlapped together, each group of the overlapped air holes is inserted into an air pipe with a diameter slightly larger than the diameter of the air holes, the length of the air pipe is less than the thickness of the overlapped annular film air bags, and all the air pipes are connected with the inflation interface and then connected with the air pump.

[0014] The dust collecting barrel has an opening and a short pipe which can be inserted into the wall interface, the bottom plate of the dust collecting barrel is movable, and the outdoor main machine can suck the garbage in the dust collecting barrel through the opening of the dust collecting barrel and the wall interface. Beneficial effects

[0015] The central dust collection system can realize the following effects after adopting the above technical solutions: no secondary dust pollution, small noise, easy cleaning, light handheld part, convenient movement, fast contraction speed of indoor hose, small volume and light weight after contraction, convenient movement, storage and storage, and can update and reform the original central dust collection system at the minimum cost. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a schematic diagram of a prior art central vacuum system.

[0017] Figure 2 is a schematic diagram of a first embodiment of a central vacuum system.

[0018] Figure 3 is a schematic diagram of a first embodiment of a retractable air hose.

[0019] Figure 4 is a schematic diagram of a second embodiment of a retractable air hose.

[0020] Figure 5 is a schematic diagram of a third embodiment of a retractable air hose.

[0021] Figure 6 is a schematic diagram of a fifth embodiment of a retractable air hose.

[0022] Figure 7 is a schematic diagram of a sixth embodiment of a retractable air hose.

[0023] Figure 8 is a schematic diagram of a seventh embodiment of a retractable air hose.

[0024] Figure 9 is a schematic diagram of an eighth embodiment of a retractable air hose. Best Mode for Carrying Out the Invention

[0025] The eighth embodiment is the best mode for carrying out the invention. Embodiments of the Invention

[0026] The invention will now be described in further detail with reference to the accompanying drawings.

[0027] Figure 1 is a schematic diagram of a prior art central vacuum system. A motor 1, a fan 2, and a filter 3 form a main unit 4, which is usually installed outside. A pipe 5 connects the main unit 4 to a wall interface 6. A hose 7 has one end connected to the wall interface 6 and the other end connected to a suction head 9 through a straight pipe 10. A handle 8 is used to move the suction head 9 and to turn on and off the main unit 4 through a switch in the hose 7 and a contact in the wall interface 6. When the main unit 4 is running, a negative pressure is created at the suction head 9, which sucks in the garbage in the room. The filtered air is discharged from the main unit 4, avoiding secondary dust pollution in the room. The bottom of the filter 3 can store a large amount of filtered garbage, greatly reducing the frequency of garbage cleaning.

[0028] Figure 2 is a schematic diagram of the first embodiment of the central vacuum system, which is different from the existing central vacuum system in that: the telescopic inflatable hose 12 made of thermoplastic film is connected to the wall interface 6 at one end and to the cylindrical dust collecting barrel 11 at the other end, and then connected to the dust collecting head 9 through the straight pipe 10. The dust collecting barrel 11 is a centrifugal cyclone dust collector, and most of the garbage sucked in by the dust collecting head 9, especially some sharp garbage, is separated by centrifugal force and gathered at the bottom of the dust collecting barrel 11. Part of the fine garbage that has not been separated enters the telescopic inflatable hose 12 from the center inlet of the dust collecting barrel 11. A layer of filter screen can be added around the outside of the inlet to ensure that the dust entering the telescopic inflatable hose 12 through the airflow is small in mass and volume, and even if it hits the thermoplastic film at high speed, it will not cause substantial damage. The air filtered by the filter 3 is discharged from the main machine 4. The air pump 13 and the valve can be arranged at the handle 8 or the dust collecting barrel 11 or the side of the wall interface 6, and the air pump 13 is connected to the inflatable interface at one end of the telescopic inflatable hose 12 through the valve and the inflation pipe. Before the dust collection work starts, first open the air pump 13 and the valve, and the telescopic inflatable hose 12 starts to inflate and extend to the maximum length or to a certain pressure, then close the air pump 13 and the valve, and the main machine 4 starts to work. After the dust collection work is completed, first close the main machine 4, then open the air pump 13 and switch the valve so that the air pump 13 can suck air from the inflatable interface and discharge it, and the telescopic inflatable hose 12 gradually shortens until it is completely retracted. In order to avoid accidental blockage of the airflow passage inside the telescopic inflatable hose 12, there is a pressure switch at the main machine 4, the pipeline 5 or the wall interface 6, which detects when the negative pressure is too low and pauses the main machine 4 until the negative pressure returns to normal. There is a switch at the handle 8 to control the start and stop of the air pump 13, and a switch to control the start and stop and switching of the valve, and a switch that can control the start and stop of the main machine 4 through wireless means. There is a pressure switch inside or outside the telescopic inflatable hose 12 that can control the start and stop of the air pump 13 and the pause of the outdoor main machine 4.

[0029] Figure 3 is a schematic diagram of the first embodiment of the inflatable flexible hose 12, which is composed of a plurality of annular air bags 15 overlapped, the two adjacent sides of the overlapped annular air bags 15 are connected to each other by means of glue or heat fusion, forming an annular band c, one or more air holes b are distributed on each layer of annular band c, the position of the air holes b of each layer is the same, all the overlapped annular air bags are connected into a cavity through the air holes b, the annular air bag 15 at least one end has an inflation interface a, before the dust collection work, the inflation interface a is inflated, the cavity is filled with gas through the air holes b and reaches a certain pressure, because the outer surface area of the cavity is larger than the inner surface area, so the airflow channel formed on the inner side can transport negative pressure air containing fine dust; after the dust collection work is completed, the main machine 4 is closed, and the inflation interface a is aspirated, the annular air bag 15 is gradually contracted axially through the air holes b, until it is completely contracted, because the position of the air holes b of each layer is the same, so the airway is always unobstructed during the axial contraction process.

[0030] A large corrugated pipe is embedded with a small corrugated pipe with the same pitch, the diameter of the large corrugated pipe valley is slightly larger than the diameter of the small corrugated pipe peak, the large corrugated pipe valley and the small corrugated pipe peak are connected by several radial ribs, the gap between the ribs is equivalent to the air hole b on the 15 annular band c of the overlapped annular air bag, which can also realize the function of the inflatable flexible hose 12.

[0031] Figure 4 is a schematic diagram of a second embodiment of the telescopic inflatable hose, in which the telescopic inflatable hose 12 needs to be fully inflated to its maximum length before each cleaning operation. If different diameter annular skeletons 16, 17 and 18 are added inside or outside the overlapping part of the annular air bag 15 and inside the annular air bag 15, the annular skeletons 16, 17 and 18 are usually made of thin steel wire or directly use thin plastic rings and are in movable connection with the side wall of the air bag 15 without affecting the telescopic function of the air bag 15. Even if the telescopic inflatable hose 12 is not fully inflated, the annular skeletons 16, 17 and 18 can support the cavity formed by the overlapping of the annular air bag 15 to ensure the smooth flow of the air flow channel formed inside under negative pressure. Thus, the telescopic inflatable hose 12 can be inflated or deflated by the air pump 13 according to the length required by the cleaning operation, reducing the unnecessary length and resistance of the telescopic inflatable hose 12 during the cleaning operation. Moreover, the main machine 4 can work when the air pump 13 is inflating or deflating, and the negative pressure formed inside the cavity by the main machine 4 can help to discharge air or speed up the air suction of the air pump 13. The annular skeleton 18 at the outermost side can also ensure that the annular air bag 15 does not contract radially when negative pressure occurs inside the annular air bag 15. Since different diameter annular skeletons are used and are staggered, the length of the telescopic inflatable hose 12 after complete contraction can be reduced for easy storage.

[0032] Figure 5 is a schematic diagram of a third embodiment of the telescopic inflatable hose. The telescopic inflatable hose 12 is spirally wound by a spiral hose 20. The two adjacent sides of the spiral hose 20 are usually connected to each other by gluing or heat sealing to form a spiral band d. One or more air holes b are distributed on the spiral band d, and the positions of the air holes b in front and back are the same. The two ends of the spiral hose 20 are closed to form a cavity. Similar to the first embodiment of the telescopic inflatable hose, at least one end has an inflation port a. Before the cleaning operation, the telescopic inflatable hose 12 is inflated from the inflation port a until it is fully stretched. After the cleaning operation, the telescopic inflatable hose 12 is deflated from the inflation port a until it is completely contracted. Since the positions of the air holes b in front and back are the same, the air path is always smooth during the axial contraction. The telescopic inflatable hose 12 can also be spirally wound by two or more spiral hoses 20 side by side to form multiple spiral bands d. One or more air holes b are distributed on each spiral band d, and the positions of the air holes b in front and back are the same. The inflation ports a at one end of each spiral hose 20 are connected together in parallel to the air pump 13, which can improve the inflation speed.

[0033] The fourth embodiment of the telescopic inflatable hose is similar to the second embodiment, and a helical skeleton made of high-elastic metal wire is added inside or outside the helical band d and inside the helical hose 20 to support the helical hose 20. The helical skeleton is in movable connection with the side wall of the helical hose 20, so that even if the cavity of the telescopic inflatable hose 12 is not filled with air, the air flow channel formed on the inner side can be kept unobstructed under negative pressure. If the telescopic inflatable hose 12 is formed by helical winding of multiple helical hoses 20 side by side, different diameter helical skeletons can be used inside or outside the multiple helical bands d and inside the helical hose 20 to reduce the length of the telescopic inflatable hose 12 after complete contraction for easy storage.

[0034] Figure 6 is a schematic diagram of the fifth embodiment of the telescopic inflatable hose. On the basis of the above-mentioned embodiments, a sleeve 30 is added. One end of the sleeve 30 has an opening and a short pipe 33. The opening is connected to one end of the telescopic inflatable hose 12. The short pipe 33 can be inserted into the wall interface 6. The end face of one end of the telescopic hose 12 is pasted with a circular ring 29. There is a pressure switch 32 between the circular ring 29 and the inside of one end of the sleeve 30. There is a wire in the short pipe 33 connecting the pressure switch 32 and the contact in the wall interface 6. There are multiple elastic flaps 31 on the side wall of the other end of the sleeve 30, which are arranged in a ring around the telescopic inflatable hose 12. When the telescopic inflatable hose 12 is filled with gas, the pressure reaches a certain value, the circular ring 29 overcomes the elastic force of the pressure switch 32, and the pressure switch 32 actuates the host 4 to run. At the same time, the hose in the sleeve 30 overcomes the elastic force of the elastic flaps 31 and gradually extends in sections. When the telescopic inflatable hose 12 reaches the required length, the inflation stops. The telescopic inflatable hose 12 outside the sleeve 30 is always filled with air, so that the telescopic inflatable hose 12 will not collapse due to the transported negative pressure gas. If the telescopic inflatable hose 12 is pulled out of the elastic flaps 31 or the telescopic inflatable hose 12 has a slight air leak, the circular ring 29 is lifted by the elastic element in the pressure switch 32, the state of the pressure switch 32 is reversed, the host 4 is shut down, and the air pump 13 starts to work until the pressure rises. The state of the pressure switch 32 is reversed again. When the dust collection work is finished, the switch valve starts to inhale and discharge, the elastic flaps 31 are one-way, the telescopic inflatable hose 12 gradually contracts, and finally can be completely retracted into the sleeve 30. The sleeve 30 can be stored together with the telescopic inflatable hose 12 in the dust collection bucket 11.

[0035] Figure 7 is the sixth embodiment of the telescopic inflatable hose, the positions and diameters of the air holes b on the annular band c are the same and overlap together, a ventilation pipe 35 with a diameter slightly larger than the diameter of the air hole b is inserted into each group of the overlapping air holes b, the length of the ventilation pipe 35 is less than the thickness of the fully collapsed and overlapped annular film air bags 15, all the ventilation pipes 35 can be connected to the inflation interface a through a static pressure chamber 36 and then connected to the air pump 13, since the diameter of the ventilation pipe 35 is slightly larger than the diameter of the air hole b, a seal is formed between the two, the air pump 13 can only inflate the annular film air bags 15 in front of the outlet of the ventilation pipe 35, and cannot inflate the annular film air bags 15 behind the outlet of the ventilation pipe 35, when cleaning, the telescopic inflatable hose 12 is pulled to make more annular film air bags 15 come out of the outlet of the ventilation pipe 35, at this time the air pressure in the film air bag 15 decreases, the air pump 13 is opened through the manual switch at the handle 8 or the automatic pressure switch, when the cleaning work is finished, the switch valve air pump 13 sucks air from the inflation interface a, the telescopic inflatable hose 12 is collapsed, and the annular skeleton 18 added inside the outermost annular film air bag 15 can ensure that the annular air bag 15 will not contract radially when negative pressure occurs in the annular air bag 15.

[0036] Figure 8 is the seventh embodiment of the telescopic inflatable hose, similar to the sixth embodiment, the diameters of the air holes b on the annular band c are of two sizes, the larger air holes b are slightly larger than the diameter of the ventilation pipe 35, and the smaller ones are slightly smaller than the diameter of the ventilation pipe 35, the diameters of the air holes b on the same annular band c are the same, the annular film air bags 15 behind the 1-3 small-diameter air holes b are a number of annular film air bags 15 with large-diameter air holes b, which are alternately overlapped, once the small-diameter air holes b are pulled out of the outlet of the ventilation pipe 35 under external force, the air holes b of the several large-diameter annular film air bags 15 behind cannot form a seal with the ventilation pipe 35 and will be automatically inflated, that is, only a slight pull can make a number of annular film air bags 15 be inflated, while the annular film air bags 15 behind will not be inflated due to the small diameter of the air holes b, and the larger-diameter air holes b can also improve the inflation and exhaust speed, when the cleaning is finished, the telescopic inflatable hose 12 is fully exhausted and collapsed, and the ventilation pipe 35 is more easily inserted into the air hole b.

[0037] Figure 9 is the eighth embodiment of the telescopic inflatable hose, similar to the sixth embodiment, the diameter of the vent pipe 35 is smaller than the vent hole b, and there is a thin film hose 37 outside the vent pipe 35, one end of the thin film hose 37 is sealed with the vent pipe 35, and the other end is connected to a static pressure chamber 38 and a gas cylinder 39, when the piston in the gas cylinder 39 moves forward, the thin film hose 37 expands, and when it moves backward, it shrinks, when the thin film hose 37 expands, its diameter is larger than the vent hole b, only the annular film air bag 15 that has detached from the thin film hose 37 can be inflated, when the thin film hose 37 shrinks, the air path between the outside of the thin film hose 37 and the vent hole b is connected to a static pressure chamber 40 and a suction port e, the suction port e is connected to the suction port of the air pump 13 through a valve and inhales, at this time only the part of the telescopic inflatable hose 12 outside the thin film hose 37 gradually shrinks, while the rest basically maintains the original elongated state, so that the telescopic inflatable hose 12 can be elongated or shortened at any time during the cleaning operation, when the cleaning operation is completed, the suction port e and the inflation port a inhale at the same time, and the telescopic inflatable hose 12 can be quickly retracted.

[0038] The ninth embodiment of the telescopic inflatable hose is similar to the seventh and eighth embodiments, that is, the diameter of the vent hole b on the annular belt c has two sizes, during the cleaning operation, the piston in the gas cylinder 39 moves forward and the thin film hose 37 expands to form a seal with the smaller diameter vent hole b, the air pump 13 inflates from the inflation port a, and the telescopic inflatable hose 12 partially elongates, when it is needed to partially retract the telescopic inflatable hose 12, the piston in the gas cylinder 39 moves backward and the thin film hose 37 shrinks, the gap between the thin film hose 37 and the larger diameter vent hole b is larger, the air pump 13 inhales from the suction port e, and the suction speed is faster, that is, the partially telescopic inflatable hose 12 shrinks faster, while the rest basically maintains the original elongated state.

[0039] The telescopic inflatable hose 12 in the above embodiments should be made of a thermoplastic film with good elasticity and high strength, such as PVC, PE, TPU, TPE, etc. The thickness of the film is usually 0.05-0.10mm, which can ensure sufficient pressure resistance and resistance to the impact of tiny dust. The annular air bag or spiral hose made of film should be axially retracted when retracted, so that the size of the telescopic inflatable hose 12 before and after inflation can differ by 30-100 times, that is, the length after inflation can reach 10m, while the length after retraction is only 100-300mm, and the weight is only 400-1000g, which can be completely stored in the dust collecting barrel 11, meeting the cleaning operation and reducing the weight, making it more convenient to move and store.

[0040] In the original home central vacuum system of the update and reconstruction, only need to use the telescopic inflatable hose 12, cylindrical dust bucket 11, air pump 13 and valve, handle 8, straight pipe 10, dust head 9 and rechargeable battery instead of the original indoor part, and add wireless transceiver in the contact or main machine 4 in the wall interface 6, the rest does not need any change, can truly realize the advantages and avoid the disadvantages; If in the newly built central vacuum system, air pump 13 and valve can also be set in outdoor main machine 4, inflatable pipe and pipeline 5 parallel with wall interface 6 connection, inflatable hose of telescopic inflatable hose through the wall interface 6 and air pump 13 and valve connection, the rest of the unused wall interface 6 can automatically close the inflatable pipe, air pump 13 and valve can share power supply with outdoor main machine 4, even can also from the main machine 4 exhaust end lead out the positive pressure air or suction end lead out negative pressure air instead of air pump 13, after closing the main machine 4 exhaust port or suction port to obtain higher positive pressure or negative pressure for telescopic inflatable hose 12 inflation or suction.

[0041] The volume of the dust bucket 11 in the above-mentioned central vacuum system embodiment is small, and the dust bucket 11 needs to be opened frequently to clean the garbage. In order to facilitate the cleaning of garbage, an opening and a short pipe are provided in the dust bucket 11. The opening can be the suction inlet of the telescopic inflatable hose 12, and the short pipe can also be the telescopic inflatable hose 12 after complete contraction. When it is necessary to clean the garbage in the dust bucket 11, the short pipe is inserted into the wall interface 6, and the bottom plate of the dust bucket 11 is moved to push the garbage in the dust bucket 11 to the vicinity of the opening of the dust bucket 11, and then the outdoor main machine 4 is started to suck the garbage in the dust bucket 11 from the wall interface. The straight pipe 10 can also be pulled out from the suction inlet of the dust bucket 11, and then the suction inlet of the dust bucket 11 is inserted into the wall interface 6, and the outdoor main machine 4 is started to move the bottom plate of the dust bucket 11. Industrial applicability

[0042] The materials, processing equipment and processing technology required in the above-mentioned embodiments are all existing, and can be completely implemented under the existing technical conditions.

Claims

1. A central vacuum system comprising an outdoor main, fixed tubing, wall interface, hose, wand, and a cleaning head, wherein: The dust collecting head and the hose have a dust collecting barrel which can be separated from the hose and store the garbage. The hose between the wall interface and the dust collecting barrel is a telescopic inflatable hose which is composed of multiple overlapped annular film air bags. The adjacent two sides of the overlapped annular film air bags are connected with each other through annular areas. The air bag at least one end of the telescopic inflatable hose has an inflation interface for inflation or exhaust. Each annular area of the overlapped annular film air bags which are connected with each other has a same-positioned air hole. The telescopic inflatable hose is formed by connecting the air holes into a cavity. The air pump is connected with the inflation interface at one end of the air bag through a valve at the handle or the dust collecting barrel, or the air pump is in the outdoor main machine and is connected with the inflation interface at the other end of the air bag through a valve and an inflation pipe at the wall interface. The air pump inflates from the inflation interface or inhales through a switching valve to control the extension and shortening of the telescopic inflatable hose. The handle has switches for controlling the start and stop of the outdoor main machine and the air pump and switches for controlling the start and stop and switching of the valve. The outdoor main machine or the wall interface has a pressure switch which can pause the outdoor main machine when the negative pressure in the fixed pipeline is too low. The telescopic inflatable hose has a pressure switch inside or outside which can control the start and stop of the air pump and pause the outdoor main machine.

2. A central vacuum system comprising an outdoor main, fixed tubing, wall interface, hose, wand, and a cleaning head, characterized in that: The dust collecting head and the hose have a dust collecting barrel which can be separated from the hose and store the garbage. The hose between the wall interface and the dust collecting barrel is a telescopic inflatable hose which is composed of at least one helical film hose which is helically wound through the connection of the adjacent two sides. The two ends of the helical film hose are closed, and at least one end has an inflation interface for inflation or exhaust. The helical areas of the helical film hose which are connected with each other have same-positioned air holes in front and back. The air pump is connected with the inflation interface at one end through a valve at the handle or the dust collecting barrel, or the air pump is in the outdoor main machine and is connected with the inflation interface at the other end through a valve and an inflation pipe at the wall interface. The air pump inflates from the inflation interface or inhales through a switching valve to control the extension and shortening of the telescopic inflatable hose. The handle has switches for controlling the start and stop of the outdoor main machine and the air pump and switches for controlling the start and stop and switching of the valve. The outdoor main machine or the wall interface has a pressure switch which can pause the outdoor main machine when the negative pressure in the fixed pipeline is too low. The telescopic inflatable hose has a pressure switch inside or outside which can control the start and stop of the air pump and pause the outdoor main machine.

3. The central vacuum system of claim 1, wherein the telescopic inflatable hose is supported by annular skeletons with different diameters inside.

4. The central vacuum system of claim 2, wherein the telescopic inflatable hose is supported by helical skeletons with different diameters inside.

5. The central vacuum system of claims 1 and 2, wherein one end of the telescopic inflatable hose has a sleeve. The sleeve has multiple elastic flaps which are arranged in a ring around the telescopic hose. The sleeve has a pressure switch inside which can control the start and stop of the outdoor main machine. The other end of the sleeve has an opening and a short pipe which connects the telescopic inflatable hose and the wall interface.

6. The central vacuum system of claim 1 or 3, wherein the air holes of the annular membrane air bags have the same diameter and are overlapped together, each group of the overlapped air holes is inserted into an air pipe with a diameter slightly larger than the diameter of the air holes, the length of the air pipe is less than the thickness of the overlapped annular membrane air bags, and all the air pipes are connected to the air charging interface and then to the air pump.

7. The central vacuum system of claim 1 or 3, wherein the air holes of the annular membrane air bags have the same diameter and are overlapped together, each group of the overlapped air holes is inserted into an air pipe with a diameter smaller than the diameter of the air holes, the length of the air pipe is less than the thickness of the overlapped annular membrane air bags, all the air pipes are connected to the air charging interface and then to the air pump, there is a membrane hose outside the air pipe, one end of the membrane hose is closed and the other end is connected to an air cylinder, the membrane hose expands or shrinks when the piston in the air cylinder moves, the diameter of the expanded membrane hose is slightly larger than the diameter of the air holes, and the air path between the outside of the membrane hose and the air holes is connected to another air inlet.

8. The central vacuum system of claim 1 or 3, wherein the air holes of the annular membrane air bags have two diameters, one slightly larger, and the membrane air bags with different numbers of air holes of the two diameters are alternately overlapped together, each group of the overlapped air holes is inserted into an air pipe with a diameter slightly larger than the diameter of the small-diameter air holes and smaller than the diameter of the large-diameter air holes, the length of the air pipe is less than the thickness of the overlapped annular membrane air bags, and all the air pipes are connected to the air charging interface and then to the air pump.

9. The central vacuum system of claim 1 or 3, wherein the air holes of the annular membrane air bags have two diameters, one slightly larger, and the membrane air bags with different numbers of air holes of the two diameters are alternately overlapped together, each group of the overlapped air holes is inserted into an air pipe with a diameter smaller than the diameter of the small-diameter air holes, the length of the air pipe is less than the thickness of the overlapped annular membrane air bags, all the air pipes are connected to the air charging interface and then to the air pump, there is a membrane hose outside the air pipe, one end of the membrane hose is closed and the other end is connected to an air cylinder, the membrane hose expands or shrinks when the piston in the air cylinder moves, the diameter of the expanded membrane hose is slightly larger than the diameter of the air holes, and the air path between the outside of the membrane hose and the air holes is connected to another air inlet.

10. The central vacuum system of any of the preceding claims, wherein the dust collecting barrel has an opening, a short pipe can be inserted into the wall interface, the bottom plate of the dust collecting barrel is movable, and the outdoor main machine can suck the garbage in the dust collecting barrel through the short pipe from the opening of the dust collecting barrel through the wall interface.

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