FR2629487A1 - LAUNDRY WASHING MACHINE HAVING OVERFLOW - Google Patents

Abstract

Washing machine 1 comprising a tank 2, a cylindrical drum 3 whose axis of rotation 16 is horizontal, a controlled water supply device, a drain means and an overflow 17 limiting the quantity of water for filling the tank 2, arranged on a side wall 33 of said tank 2.

Description

Description

  Washing machine with overflow "The invention relates to a washing machine

  comprising a tank, a cylindrical drum whose axis of ro-

  tation is horizontal, a water supply device at a controlled level, a means of emptying and an overflow limiting

  the quantity of water filling the tank.

  Such a washing machine is known from the patent

  French No. 2,533,026. Patent No. 2,533,026 describes a ma-

  washing machine comprising a liquid feeding device

  with controlled level, formed by a solenoid valve ensuring a

  water supply to the tank, a compression chamber

  sion converting a variation of a tank water level

  in a variation of air pressure and whose lower end

  can be immersed in the water of the tank, of a pressure

  state sensitive to the pressure of the air contained in the chamber and controlling the opening or closing of the solenoid valve by

cooperation with a programmer.

  It is also fitted out in

  wash the laundry, an overflow limiting the water level

  held in the tank, in the case, for example, of a stop of operation of the pressure switch. The overflow is generally composed of a vertical pipe, mounted as a bypass on draining means located at the bottom of the tank, overflow placed upstream of a drain pump, and operating under the principle of communicating vessels. The maximum water height that

  can contain the tank then corresponds to the height of the

  vertical alignment opening into the external space of the tank.

  When the washing machine drum does not turn

  don't, or spin slowly; state considered to be a

  static state; the displacement of the body of water during

  the drum creates a level of water in the tank

  corresponding to the level of water contained in the pipeline.

  When the washing machine drum rotates at higher speed; state considered to be a dynamic state; the overflow has the disadvantage of causing untimely overflows. In the tank, a wave of water rises in the direction of rotation of the drum. The height of the

  wave then determines the height of the water level in the cana-

  verticalization and generates an overflow of water in the es

  external space of the tank without, for this, that the quantity of water

  maximum permissible content in the tank is exceeded.

  The subject of the invention is an overflow of a washing machine which is not influenced by the movements of the mass of water contained in the tank of the washing machine during its

dynamic state operation.

  It is characterized by the fact that the overflow arranged on a wall of the tank has a drain hole placed

  in a substantially horizontal plane passing through the axis of ro-

  tation of the drum, opposite with respect to said axis, of the

  gue generated in the tank by the rotation of the drum. In

  this area of the overflow tank is no longer subjected to an ef-

  fet of vessels communicating with the water contained in the tank, drawback of the overflow of the prior technical field. Of

  more, juxtaposed with the tank, it is of a reduced size.

  Advantageously, the overflow is arranged on

  a substantially flat and vertical side wall of the tank.

  Arranged on the side wall, the drain hole is oriented perpendicular to the dynamic movement of the water wave generated by the rotating drum. In addition, when molding a polypropylene tank it is possible to integrate into the

  tank all or part of the form of said overflow.

  In one form of the invention, the overflow is composed of a foam trap and a siphon forming a conduit composed of three tubular parts in an arc of a circle, placed side by side, concentric with the axis of rotation of the drum,

  the three tubular parts being connected by elbows.

  In particular, the drain hole is placed so that a line joining the axis of the drain hole and the axis of rotation of the tank forms an angle of about 10 with respect to the horizontal plane. The drain hole in communication with the internal space of the tank is placed in a zone of non-turbulence directly linked to the direction of movement of the wave.

  generated by the rotation of the drum.

  Preferably, the tubular parts of the foam trap form an open arc of an angle of about 100 'and the tubular parts of the siphon form a

  arc of a circle open at an angle of about 140. The general form

  overflow was obtained following comparative tests

  tifs which have optimized shapes and dimensions for the proper functioning of the foam trap as well as the siphon both facilitating the evacuation of a determined amount of water when the washing machine does not work, for example

  when the pressure switch does not work.

  Advantageously, the foam trap is provided with a foam trap hole communicating with the internal space of the tank and the siphon is provided with a siphon hole in its part.

  high communicating with the internal space of the tank.

  The small diameter foam trap hole

  allows, without reducing the effectiveness of the foam trap, to

  ner the amount of water in the foam trap, after a spill, and avoid this water stagnating and

  emits some unpleasant odors over time.

  The siphon hole of small diameter allows, without reducing the efficiency of the siphon, to stop the syphonic effect

for low water flow.

  The description below, all given as

  non-limiting example, will make it clear how the invention

tion can be achieved.

  Figure 1 shows a washing machine in which is installed an overflow known in the

previous technical field.

  Figure 2 is a perspective view of a washing machine tub on which is molded part of the excess

full according to the invention.

  Figure 3 is a view of the overflow according to the

  vention. FIGS. 4a and 4b are respectively a diagram of the displacement of water in a pipe during the dynamic operation of a known washing machine and a diagram of displacement of water of a machine in operation

  in a dynamic state and having an overflow according to the

  vention. Figure 1 shows a washing machine 1 comprising a tank 2 in which is arranged a cylindrical drum 3 whose axis of rotation is horizontal, the drum being driven by a motor. In the washing machine 1 is fitted a water supply device at a controlled level comprising a solenoid valve 4 ensuring a supply of water to the tank 2, a compression chamber 5, one of which

  end can be immersed in the tank water for assu-

  a conversion of the variation in the supply water level

  tation of the tank in a pressure variation of a column

  air, a pressure switch 6 and a programmer 7 ensuring the com

  solenoid valve request. A draining means 9 and an overflow 8 ensure that the washing water is poured out of the tank 2, either when the tank is emptied, or when the water level reaches a maximum admissible height, when

  for example the pressure switch 6 or the programmer 7 does not work

no longer.

  The overflow 8 is composed, in a known manner, of a vertical pipe 10 placed in bypass on a pipe 11 of the draining means 9, between a lower part 12

  of the tank and a drain pump 13.

  The vertical pipe 10 opening into the external space 14 of the tank determines, by the principle of the communicating vessels, a maximum height of water in the tank,

  in a static operating state of the washing machine.

  Figure 2 is a perspective view of the tank

  2 of a washing machine 1, tub molded of synthetic material

  tick. It is shown a hopper 15, a bearing carrying a

  axis of rotation 16 of the drum 3, as well as an overflow 17 se-

  lon the invention partially molded with the tank, on a pa-

  lateral king 33 substantially flat and vertical of said tank 2.

  Figure 3 shows the overflow 17 of the fi

  gure 2 positioned with respect to a horizontal line 18 steps-

  sant by the axis of rotation 16 of the drum 3. The overflow is composed of a foam trap 19 and a siphon 20 forming a conduit composed of three tubular parts 21, 22, 23, in a circular arc of section rectangular, placed side by side and concentrically with the axis of rotation 16 of the drum. The tubular part 22 placed between the tubular parts 21 and 23 is

  linked on the one hand to the tubular part 21 by a lower bend

  laughing 24 and on the other hand to the tubular part 23 by an upper bend 25. A drain hole 26 allows direct communication between the overflow 17 and the internal space of the tank

  2. The drain hole 26 is positioned at a distance of approx.

  150 mm from the axis of rotation of the drum, the line passing through the axis of the drain hole 26 and through the axis of rotation 16 of the

  drum of the tank, formed with the horizontal line 18, one year

gle of about 10 '.

  The tubular parts 21, 22 with the lower bend

  laughter 24 form a foam trap and the tubular parts

  22 and 23 with the upper elbow 25 form a siphon which

  cilite the flow of water when the amount of water from the

  tank is greater than the maximum admissible quantity of water.

  The particular position according to the invention of the overflow is linked to the fact that the water is displaced, when the drum drives it by its rotation, by forming a wave which rises in the direction of rotation of the drum at the opposite with respect to the axis of rotation of the zone in which the hole 26 is arranged. The overflow is therefore no longer influenced by the dynamic movements, by waves, of the water in the tank. A drain hole 27 is placed in the lower part of the overflow siphon 20, on the pipe 23, drain hole 27 communicating with the external space of the

tank 2.

  The siphon 20 is provided with a small O10 siphon hole 28 arranged in the upper elbow 25, siphon hole 28 which communicates with the internal space of the tank 2, and allowing

defusing the siphon 20.

  The foam trap 19 is provided with a small diameter foam trap hole 29 arranged in the inner elbow 24, a foam trap hole 29 which communicates with the internal space of the tank 2 to avoid water retention in the

tubular parts 21 and 22.

  Figures 4a and 4b are two explanatory diagrams

  of water movements in dynamic operation

a washing machine.

  Figure 4a shows the known overflow of the

  previous technical field, consisting of a vertical pipeline

  wedge 10 in diversion with the draining means 9. When the drum 3 rotates in the direction of the arrow F, it occurs

  a wave 30. By the principle of communicating vessels, the mo-

  The water creates a pseudo water level, represented by a line 31 in dashed lines, which tends to balance with the water level contained in the vertical pipe, which causes, while the amount of water contained in the machine is normal, an overflow of the water contained in line 10, when the pseudo level is above the

edge 32 of line 10.

  FIG. 4b represents the overflow 17 according to the invention, the location of the drain hole 26 of the overflow 17 communicating with the internal space of the tank is then placed in a zone of low turbulence, where the water level stays below the state of static water level at

  time of wave 30 formation.

  The overflow 17 also has the advantage

  described, that of being integrated into the tank, reducing the clutter-

  elements contained in the washing machine, and dimi-

  negating the labor costs during the construction of

said washing machine.

Claims (8)

Claims:   1. Washing machine comprising a tank, a cylindrical drum whose axis of rotation is horizontal, a water supply device at a controlled level, a means   drain and an overflow limiting the amount of filling water   pleating of the tank, characterized in that the overflow   swam on a wall of the tank has a drain hole placed in a substantially horizontal plane passing through the axis of rotation   of the drum, opposite to said axis of the wave in   gendré in the tank by the rotation of the drum.   2. Washing machine according to claim 1, charac-   terized in that the overflow is arranged on a wall la-   substantially flat and vertical teral of the tank.   3. Washing machine according to claim 1 and 2, characterized in that the overflow is composed of a trap.   foam and a siphon forming a conduit composed of three parts   tubular parts in an arc, placed side by side, concentrated   three times at the axis of rotation of the drum, the three parts   tubulars being connected by elbows.   4. Washing machine according to claim 1, 2 and 3, characterized in that the drain hole is placed so that a line joining the axis of the overflow drain hole and the axis of rotation of the tank shape in relation to the plane horizontal an angle of about 10.   5. Washing machine according to claim 3, charac-   terized in that the tubular parts of the foam trap   form an open arc of an angle of about 100c.   6. Washing machine according to. claim 3, charac-   terized in that the tubular parts of the siphon form a   arc of a circle open at an angle of about 140.   7. Washing machine according to claims 3 and 5,   characterized in that the foam trap is provided with a foam trap hole communicating with the internal space of the tank. 8. Washing machine according to claim 3 and 6, characterized in that the siphon is provided with a siphon hole in its upper part communicating with the internal space of the tank.