FR2536264A1 - DEVICE FOR INDICATING THE DEGREE OF FILLING OF THE FILTER BAG OF DUST VACUUM CLEANERS OF THE "BROOM" TYPE - Google Patents

Abstract

The invention relates to a device for indicating the degree of filling of the filter bag of dust vacuum cleaners of the "brush" type. IN THIS DEVICE, THE BOX 9 OF A MUFFLER SHOWS A RECESS 13 IN THE SHAPE OF A BOWL WHICH IS COVERED BY A RETAINING RING 18 SUPPORTING A MEMBRANE 15. THE BOTTOM 24 OF THE SAID RECESSED 13 IS BORED WITH AN ORIFICE 16 ESTABLISHING A PNEUMATIC COMMUNICATION WITH THE INTERIOR OF THE MUFFLER 7 AND IN FRONT OF WHICH A FILTRATION FELT CAN BE PLACED 25. APPLICATION TO THE FILLING CONTROL OF DUST VACUUMS, IN PARTICULAR OF THE "BRUSH" TYPE.

Description

The present invention relates to a device

  intended to indicate the degree of filling of the filter bag *

  Dust extraction type "brush", in which the filter bag is placed downstream of the blower and a silencer is located before the filter bag, the indicator device being constituted by a measuring box of

  the pressure equipped with a membrane.

  It is usually common to use in vacuum

  Dust sources of such pressure measuring boxes

  which comprise a membrane stressed by the different pressure

  and mechanically interlocking an electrical switch.

  However, devices of this type are incor-

  pores in the form of separate pressure measuring boxes, which are then connected by flexible tubes to the pressure chambers to be monitored.

  these flexible tubes have a small section, it is neces-

  in rooms in which dust accumulates, to cover by a filter the extreme

  these tubes to avoid their obstruction.

  The present invention therefore aims to incorporate

  in a dust broom-type vacuum cleaner

  indicating the degree of filling of the filter bag.

  in such a way that it is not necessary to provide additional connecting lines, and it is possible to dispense with additional filtration devices. According to the invention, this object is achieved

  in that the muffler housing has a recess

  cup-shaped cement which is covered by a retaining ring supporting a membrane; and in that the bottom of said recess is pierced with a hole which establishes

  air communication with the internal part of the silencer

  heavens. Under these conditions, it is advantageously made so that a device for indicating the degree of filling of the filter bag can be incorporated in a vacuum cleaner type "brush" without a large

  number of additional rooms or additional pipes

  The invention will now be described in more detail by way of non-limiting example D with reference to the accompanying drawings, in which FIG. 1 is a side elevation in arracl of a vacuum cleaner of the "gbalai" type equipped with a silencer and a pressure measuring boot; and Figure 2 is a fragmentary sectional scale

  corresponding to the circle of Figure 1 and represents

  both the arrangement of the pressure measuring box.

  FIG. 1 illustrates in section the head 1 of the engine of a dust vacuum cleaner of the "broom" type. This head 1 comprises a double-walled casing 2 and an electric motor 3 which is housed in this casing 2 and enters a wind tunnel. On one end, 5, on its sides, the head 1 is connected to nozzles or additional accessories (not shown) and the connection with a dust filter bag (not shown) is established on its This is therefore a vacuum cleaner type "" broom "with a filter bag located downstream of the suction blower 4 o Since in dust cleaners of this category, the filter bag the dust is, in a classical way, only surrounded by a basket or by a thin shell, all the noises caused by the motor

  3 and the suction blower 4 come out direc-

from the back.

  This is why it is provided in the head 1 of the engine a silencer 7 which is interposed to maintain very low noise generation When such a device for indicating the degree of filling must be incorporated in a vacuum cleaner of this type,

  this device works in the overpressure range, that is,

  that is to say that the pressure control must take place on the path from the suction blower 4 to the bag of

dust filtration.

  Since obstruction problems occur in conventional control lines and the muffler 7 is embodied as what is called an absorption muffler (see FIG. the pressure is directly installed on a box 9 of the silencer and an absorbent material 10 is

used as a filter.

  The fragmentary section of FIG. 2 shows the embodiment of the device 8 for controlling the pressure on the casing 9 of the silencer. The silencer 7 comprises its casing 9 and the absorption material 10 which, housed in said casing, is covered by a perforated tube 11 on the path traveled by the air (illustrated by an arrow) to establish a pneumatic connection, a tube 12 from the suction blower 4 enters the tube 11 near this

  connection zone, the silencer box 9 has a

  This recess 13 forms a pressure chamber 14 associated with a diaphragm 15. Through an orifice 16 formed in its bottom 24, an intermediate space 17 and the absorbent material 10, this recess is in pneumatic connection with the main path traveled by the air to the tube 11 The paths

  traveled by the air are indicated by arrows -

  The recess 13 in the form of a bowl is closed off by the membrane 15 This membrane 15 is then held in place by a retaining ring 18 which traps, with hooks 19, a bead 20 integral with the recess 13, and which is riveted by its other end to a pin 21 In its center, the membrane 15 supports a fixed plate 22 which, when said membrane 15 is deformed upwards, can for example actuate a switch

  electric via a lever 23.

  Where necessary, a felt marker

  additional treatment 25 may still be placed in front of

the orifice 16.

  It goes without saying that many modifications can be made to the device described and shown, without leaving

of the scope of the invention.

Claims (2)

  1 device for indicating the degree of filling of the filter bag of "brush" type dust extractors in which the filter bag is placed downstream of the blower and a silencer is in front of this filter bag, the indicator device consisting of a pressure measuring box equipped with a diaphragm, characterized in that the casing (9) of the silencer is provided with a recess (13) in the form of a bowl which is covered by a retaining ring (18) supporting   a membrane (15); and by the fact that the bottom of said renfon-   cement (13) is pierced by an orifice (16) which   air connection with the interior of the silencer (7).   2 indicating device according to claim 1, characterized in that a filtering felt (25) is placed in front of the orifice (16)