FR2779814A1 - Device for detecting pressure rises in a water distribution network, especially a sewage network - Google Patents

Abstract

Device comprises a body (1) blocked by a head (2), which is mounted to move within the head. The head has lugs (9) that are guided in channels (11,12) within the body. When the head is lifted by pressure it rotates in the body (1) as the lugs are guided in the channels. Marks (15,16) on the top of the body indicate that the head has rotated and therefore the pressure changed. When the pressure falls the head drops down through vertical channels.

Description

The present invention essentially relates to a detector device

  the rise in pressure of a liquid flow network for example constituted by

wastewater or rainwater.

  It also relates to a buffer or cover allowing access to the aforementioned network and provided with such a

detector device.

  Until now, no simple, reliable and practical device has been proposed for visualizing the pressure increase in liquid flow networks, such as sewer systems or

  waste or rainwater disposal.

  Also, the present invention aims to fill

this gap.

  To this end, the subject of the invention is a device for detecting the rise in pressure of a liquid flow network and of the type comprising a body closable by a head mounted relatively mobile in this body, which device is essentially characterized in that the body and the head are provided with cooperating means which allow a rotation of the head relative to the body when the said head is raised relative to said body, then a displacement without rotation of the head relative to the body when the latter descends by gravity in the closed position of the body so as to be able to detect, by reference marks or the like on the head and the body, a rise in pressure caused by the

  displacement of the head in the body.

  According to a preferred embodiment of this detector device, the head comprises a rod provided with opposite lugs or the like respectively guided in a groove, ramp or helical analogous formed in the internal wall of the body and emerging, in the upper part of the body, into a second groove or the like also made in the internal wall of the body, but

  extending parallel to the axis of the body and the rod.

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  According to another characteristic of the invention, the aforementioned body and head each comprise, at the top, at least one boss allowing the visualization of the rotation or not of the head relative to the body. According to an exemplary embodiment, the stem of the head has the shape of a crosspiece, one wing of which

  carries on its opposite edges the aforementioned pins.

  It will also be noted that the aforementioned rod has at its free end opposite the head of the legs or

  analogues likely to hold the head in the body.

  The aforementioned body comprises in the upper part a seat

  suitable for receiving the aforementioned head.

  Each aforementioned helical groove or the like extends between the lower part and the upper part of the body so as to allow rotation of the head relative

to the body of about 90.

  But other features and advantages of

  the invention will appear better in the description

  detailed which follows and refers to the appended drawings, given only by way of example, and in which: - Figure 1 is a perspective view of a frame or the like intended to border a manhole allowing access to a sewer network for example, which frame is closed by a buffer or cover provided with a detector device according to the invention; - Figure 2 is an enlarged perspective view of the detector device in the rest position; - Figure 3 is a view similar to Figure 2 but showing the detector in the activated position by a pressure increase; - Figure 4 is a view similar to Figures 2 and 3, but showing the detector device again in the rest position, but whose head has been rotated relative to the body due to a rise in pressure; and

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  - Figure 5 is a perspective view of the framed part V in Figure 4, showing the connection of a helical groove to a groove

  vertical in the upper part of the detector body.

  A detector device according to this invention, and according to the embodiment shown, consists essentially of two annular parts, made for example of a suitable molded plastic, namely a body 1 of generally cylindrical shape and a head 2 forming in somehow a valve capable of blocking the body 1 and mounted

relatively mobile in this body.

  As can be clearly seen in FIG. 1, the body 1 can be fixed by any suitable means to a cover or plug 3 closing off a frame 4 itself sealed to the opening part of a manhole (not shown) giving access to a sewer system or

  rainwater evacuation for example.

  As can be seen in Figures 2 to 4, the head 2 has the shape of a disc 5 and is integral with a rod 6 which, according to the example shown, has the shape of a cross with two orthogonal wings

marked respectively 7 and 8.

  The opposite and axial edges 8a of one 8 of the two wings 7, 8 each have a protruding lug 9 capable of cooperating with guide grooves

  practiced in the internal wall 10 of the body 1.

  More specifically, the opposite lugs 9 are each guided in a helical groove 11 which opens, in the upper part of the body 1, in a second groove 12, this second groove being vertical, that is to say parallel to the axis XX 'of the body 1 or of the rod 6 in the form of a cross. In other words, the internal wall 10 of the body 1 comprises two opposite helical grooves 11 opening, in the upper part of the body 1, into two opposite vertical grooves 12, while the pins 9

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  are each housed and guided in a helical groove

  11 which is followed by a vertical groove 12.

  The body 1 has in the upper part a rim 13 forming a seat 14 of shape capable of receiving the disc-shaped part 5 of the head 2, and this in flush

  with the edge 13, in the manner of a valve head.

  We have shown at 15 boss-shaped marks provided on the upper part of the edge 13 of the body 1. We also see at 16 other boss-shaped marks provided on the upper wall of the disc 5 forming the head 2 mounted relatively and freely mobile in the

body 1.

  According to the example shown, the marks 15 on the one hand, and the marks 16 on the other hand, are arranged in opposite manner on the edge 13 of the body 1 and the disc 5 of the head 2 respectively. The number of marks 15 and 16, as well as their distribution on the edge 13 and the disc 5 could perfectly be other and arbitrary, without

  for this to depart from the scope of the invention.

  The rod 6 of the head 2 has, at its end opposite to that comprising the disc 5, lugs or the like 17 capable of retaining the head 2 in the body 1 when the said head is raised relative to this body, and this by the makes legs 17 come

  abut on the lower edge of the body 1.

  According to the embodiment shown, the lugs 17 are provided at the free and lower end of one 7 of the two wings 7, 8 formed by the rod 6 of the

head 2.

  Returning to the opposite helical and vertical grooves 11 and 12 formed in the internal wall 10 of the body 1, it is clearly seen in FIG. 5 how the upper part of the helical grooves 11 opens into the vertical grooves 12, that is to say how the lugs 9 arriving in the upper part of the helical grooves 11 may somehow fall into the vertical grooves 12 to cause, after the head has risen

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  2, the descent by gravity of said head 2 into the body 1. However, for a better understanding of the invention, the operation of the detector device which has just been described will be described briefly below, referring successively to the figures 2, 3 and 4. In the rest position, visible in FIG. 2, the head 2 rests on the seat 14 of the body 1. The opposite lugs 9 are in the lower part of the opposite helical grooves 11, and the bosses 16 of the head 2 are in

  coincidence with the bosses 15 of the body 1.

  If there is a rise in pressure in the network, as illustrated by the arrows F in FIG. 3, as will be understood, there will be an uplift of the head 2 relative to the body 1, as well as a rotation simultaneous of said head due to the pins 9 which follow the path imposed by the helical grooves it. When the head 2 arrives in the maximum lifting position under the effect of the pressure, the opposite lugs 9 then arrive in the upper part of the helical grooves 11il and therefore come to be placed inside and to the right of the opposite vertical grooves 12. Thus , when the pressure in the network falls, the head 2 also falls vertically in the body 1 while being guided by the opposite lugs 9 which follow the path imposed by the

vertical grooves 12.

  In this position, the head 2 then comes to rest on the seat 14 of the body 1, but as can be seen in FIG. 4, the marks and bosses 16 of the head 2 form an orthogonal alignment with respect to

  that of the bosses 15 on the body 1.

  As a result, a network inspection officer will be able, as we understand, to visually ascertain that a pressure increase has occurred in said network. And he can of course rearm the device

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  detector of the invention, by lifting the head 2 relative to the body 1, then causing the said head to rotate according to the arrow G in FIG. 4, so that the lugs 9 having risen along the vertical grooves 12, can pass through the helical grooves 11, the head 2 then descending into the body 1 and a simultaneous rotation, so that the bosses 15 and 16 return in coincidence as

shown in figure 2.

  It will be noted here that the position of the head 2 visible in FIG. 1 corresponds to that shown

in figure 3.

  A detector device for a sewage network has therefore been produced according to the invention which is particularly simple, reliable and effective for detecting a rise in pressure, resulting in a change in level, in any liquid flow network and such such as wastewater or rainwater. Such a detection device can advantageously be fitted with a cover or plug closing off a chamber in the network in question. In addition, the head of the device being able, at any time, to sink freely into the buffer without the slightest effort, there will be no danger

for vehicle traffic.

  Of course, the invention is in no way limited to the embodiment described and illustrated which has not been given

as an example.

  Thus, the shape and the length of the helical grooves can be arbitrary, as well as the arrangement, the number and the shape of the marks on the body and the head. In other words, it depends on the misalignment of the benchmarks that we want to obtain to reveal the increase in pressure in the network. This means that we can obtain with the detector device of the invention any angle of rotation of the head relative to the body. Likewise, instead of grooves

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  helical, any equivalent means could be used, such as for example ribs forming a ramp. The invention therefore includes all the technical equivalents of the means described and their combinations if these are carried out according to the spirit.

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Claims (8)

  1. Device for detecting the rise in pressure of a liquid flow network such as for example waste or rainwater and of the type comprising a body (1) closable by a head (2) mounted relatively mobile in this body, characterized in that the body (1) and the head (2) are provided with cooperating means which allow rotation of the head (2) relative to the body (1> during the lifting of said head relative to said body, then displacement without rotation of the head (2) relative to the body (1) when the latter descends by gravity into the closed position of the body (1) so as to be able to detect, by means of marks (15, 16) on the head and body, a pressure rise caused   by the displacement of the head (2) in the body (1).   2. Detector device according to claim 1, characterized in that the head (2) comprises a rod (6) provided with opposite lugs or the like (9) respectively guided in a groove or a helical ramp (11) formed in the wall internal (10) of the body (1) and opening, in the upper part of the body (1), in a second groove (12) also formed in the internal wall (10) of the body, but extending parallel to   the axis (X-X ') of the body (1) and of the rod (2).   3. Detector device according to claim 1 or 2, characterized in that the aforementioned body and head each comprise, in the upper part at least one boss (15, 16) allowing the visualization of the   rotation or not of the head (2) relative to the body (1).   4. Detector device according to one of   Claims 1 to 3, characterized in that the rod (6)   of the head (2) has the shape of a crosspiece of which a wing (8) carries on its opposite edges (8a) the pins cited above (9).   5. Detector device according to one of   previous claims, characterized in that the rod 9 2779814   above (6) has at its free end opposite the head (2) legs (17) capable of retaining the head (2) in the body (1).   6. Detector device according to one of   previous claims, characterized in that the   said body (1) comprises a seat (14) capable of receiving the aforementioned head (2).   7. Detector device according to claim 2, characterized in that each groove or helical ramp (11) extends between the lower part and the upper part of the body (1) so as to allow rotation of the head   (2) relative to the body (1) of about 90.   8. Buffer fitted with a detector device according to   any of the preceding claims.