CH658894A5 - Mixer tap water. - Google Patents

Description

658894

2

CLAIM

Water mixing valve, capable of interrupting the flow of water after the passage of a predetermined quantity of mixed water, consisting of a hot water pipe (4) and a cold water (5) which are designed to be opened and closed respectively by means of a hot water valve (8) and a cold water valve (9) and communicating with each other by a water pipe mixed (12), characterized in that it comprises a reduction mechanism (17) isolated from this mixed water pipe and provided with at least one cam (22) connected with the hot water valve and with the valve cold water via valve stems (24), a flow control button rod (18) and at least one camshaft (20) on which the cam is mounted, the rod button (18), the camshaft and the reduction mechanism being connected in such a way that the rotational force of a valve wheel (15) driven by the flow of the mixed water can be transmitted in a single l direction, thus making it possible to interrupt simultaneously, separately and automatically the flow of hot and cold water as a function of the predetermined quantity of mixed water.

The present invention relates to a water mixing valve forming part of sanitary installations, capable of automatically interrupting the flow of hot and cold water when a predetermined quantity of mixed water has been flowed, in other terms capable of quantitatively interrupting the flow of water. There is a conventional water mixing valve, capable of automatically interrupting the flow of mixed water when predetermined quantities of hot and cold water have been supplied, this water mixing valve being explained in Figure 1 (Figure 6 in the description of the present invention) in the Japanese patent filed under No. 14666/1981. Brief description of the drawings:

Fig. 1 is a partial view in longitudinal section of a water mixing valve according to the present invention;

fig. 2 is a front view in elevation in a section along the axis A-A of FIG. 1;

fig. 3 is an enlarged front view in elevation in a section along the axis B-B of FIG. 1;

fig. 3b is an enlarged front view in elevation in a section along the axis C-C of FIG. 1;

fig. 4 is a partial front view in elevation of another example of a cam;

fig. 5 is a partial front elevation view of the section of a water mixing valve provided with another example of a valve body;

fig. 5b is a partial side view in elevation enlarged in a section along the axis D-D of FIG. 5a, finally fig. 6 is an illustration of a previous type of water mixing valve.

The known water mixing valve will be described with reference to FIG. 6. A water mixer tap body 41 is provided with a hot water pipe 42, a cold water pipe 43, a mixed water pipe 44 and a flow pipe 45 arranged in the order shown. A valve 49 is disposed opposite the valve port 46 open in the mixed water line 44, so as to close and open the valve port 46 when the valve 49 is respectively engaged or triggered relative to the cam 48 disposed in an intermediate portion of the pipe 47. A control valve 51 having a hot water pipe 42 and a flow control valve seat 50 are provided so as to extend across the delivery pipe. hot water 42 and cold water pipe 43. Control valves 52 are arranged in intermediate portions of the pipes connecting the body of the water mixer tap 41 to a cold water pipe and to a water tank hot.

In this water mixing valve, the hot water pipe as well as the cold water pipe and the mixed water pipe communicate freely with each other. Consequently, when a determined quantity of mixed water has flowed enough to close the valve orifice, the flow of hot water, as well as that of cold water, is interrupted in the line d mixed water, since hot and cold water communicate with each other on the main pressure side. It follows that hot water or cold water, that whose pressure is higher than the pressure of io the other, flows towards the other, so that the flow of the latter is done in reverse. When the cold water is flowing to the hot water so as to cause the backflow of the latter, a safety valve located in the hot water tank is subjected to a pressure such that it opens from so that all of the hot water is expelled outside of this tank. When it is hot water flowing to cold water so as to cause the backflow of the latter, not only the interior of the water pipe becomes unsanitary, but a meter for cold water is broken by hot water. The control valves available in the intermediate portions of the hot water pipe and the cold water pipe are provided with springs whose elastic force is normally so weak that it does not prevent the flow of water. 'water. For this reason, when a foreign body is held between a control valve and a valve seat, the flow of water cannot be completely interrupted by the elastic force of a spring alone.

One of the objects of the present invention is to solve the above-mentioned problems and to automatically close a valve port on the hot water side and a valve port on the cold water side either separately or simultaneously depending on the supply of a predetermined quantity of mixed water.

The water mixing valve of the present invention is described in the characterizing part of the claim. It consists of a hot water pipe 4 and a cold water pipe 5 which are designed to be able to be opened and closed respectively by means of a hot water valve 8 and a valve d cold water 9 and communicating with each other by a mixed water pipe 12, characterized in that it comprises a reduction mechanism 17 isolated from this mixed water pipe and provided with at least one cam 22 40 connected with the hot water valve and with the cold water valve via valve stems 24, a button stem 18 for adjusting the water flow and at least one camshaft 20 on which the cam is mounted, the button rod 18, the camshaft and the reduction mechanism being connected in such a way that the rotational force of a flap wheel 15, driven by the flow of the mixed water , can be transmitted in only one direction, thus making it possible to interrupt simultaneously, separately and automatically the flow of hot and cold water as a function of e the predetermined amount of mixed water.

An embodiment of the present invention should here be described in detail, with reference to the drawings.

The embodiment of the present invention is designed as follows. As shown in Figures 1 to 3a and 3b, a body 1 of water mixing valve is provided at its two ends 55 with a hot water pipe 4 and a cold water pipe 5 which are connected respectively to part 2 of hot water tap and to part 3 of cold water tap, in which the valves are opened as soon as the temperature of the mixed water has been adjusted, and which communicate respectively with a hot water supply source 60 and with cold water supply source. It is arranged in an axis passing through the hot water pipe 4 and the cold water pipe 5, threaded holes 7, 7, in which covers 6, 6 and a water valve orifice are fixed. hot 10 as well as a cold water valve orifice 11 which are respectively opposite a hot water valve 65 and a cold water valve 9, so that the holes 7, 7 and the orifices of valve 10 and 11 communicate coaxially with each other as well as with a mixed water pipe 12. This mixed water 12 also communicates with a flow pipe 14

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by a communication orifice 13. The flow pipe 14 further communicates with a flow pipe 26. The discharge of the mixed water in the flow pipe 14 causes the rotation of a valve wheel 15. The rotation force of the valve wheel 15 is transmitted to a reduction mechanism 17, the description of which is known, consisting of a reduction gear train arranged on a shaft 16, arranged coaxially with the valve wheel 15 and a gear train reduction on another 16 'shaft. The rotational force, after being reduced to a predetermined level, is then transmitted to the gears 19,19 'on a button rod 18 which will be described later. The resulting rotational force is then transmitted via the gears 21, 21 which are engaged with the gear 19 ', on the cam shafts 20, 20 to the cams 22, 22 which are mounted at the ends of these shafts 20, 20, so as to be positioned in the flow line 14. Consequently, the engagement positions on the curved surfaces in action 23 relative to the valve stems 24 which are opposite to the surfaces in action 23 in the valve hot water 8 and in the cold water valve 9 vary in such a way that, when the quantity of mixed water delivered has reached a level determined in advance by the button rod 18, the orifice 10 of the hot water valve and the orifice 11 of the cold water valve are immediately closed independently. A button 25 is fixed to the rod 18, so that the number of turns to be made by the button 25 can be determined as an amount of mixed water flow to be set beforehand in a position in which a graduated scale whose description is known and an index (these two elements are not shown) will be arranged on the circular surface of the button 25 and the corresponding part of a circular surface of the body 1 of the hot water tap.

The valves located in part 2 of the hot water tap and in part 3 of the cold water tap, opened and closed by operating the buttons 25a, 25b, must be kept open after the temperature of the hot water has been settled. The discharge of the mixed water into the flow pipe 14, obtained by the rotation of the valve wheel 15, is supplied to the outside by a flow pipe 26. FIG. 4 shows another example of a cam 22. A single cam 22 'is disposed at opposite ends of a circular surface with curved active surfaces 23, 23, having the same curvature and opposite the active ends 27, 27, of valve stems 24. Figures 5a and 5b show a another example of the hot water valve 8 and the cold water valve 9. In this example, a valve body 28 is provided with a slide 31 which is inserted into the orifice 10 of the water valve hot and in the orifice 11 of the cold water valve, so as to be placed at any time in a threaded hole 30 formed in the central part of a seal 29, so that the valve body 28 can be used on both the hot and cold water side. The slide 31 has several recesses marked 13 'in the middle of several ribs 32 arranged on its circular surface, these recesses allowing a fluid to flow between the surfaces of the latter and the interior surfaces of the orifice 10 of the valve d hot water and port 11 of the cold water valve.

We will now proceed to describe a case in which a certain quantity of mixed water is necessary to supply, for example, a washing machine and a hot water tank (two cases which have not been shown here ). First of all, when the button 25 shown in FIG. 1 is operated in a predetermined direction to adjust a certain required quantity of mixed water on the graduated scale, the rotation of the button rod 18 is transmitted to the cams 22, 22, by means of the gears 21, 21 which are engaged with the gear 19 'on both sides thereof, so as to rotate the cams 22, 22 in the same direction and in the same way. During this time, the engaged positions of the curved surfaces in action 23, 23 of the cams 22, 22, which are opposite the action ends 27, 27 of the valve stems 24, 24, reach predetermined positions for quantitative adjustment of flow. The operation of the button 25 is then stopped and the orifice 10 of the hot water valve and the orifice 11 of the cold water valve which are respectively opposite the hot water valve 8 and the cold water valve 9 are open at the same time.

During the above operation, the gear 19 on the button rod 18 turns idle like a friction coupling, the description of which is known, as shown in Figure 3b, so that the force of rotation of the rod 18 cannot be transmitted to the reduction mechanism 17. It is therefore possible to gently actuate the button 25.

When the knobs 25a, 25b are turned in the direction corresponding to the opening of the valves after the adjustment of a certain flow rate of mixed water, by means of the operation described above, the hot water flows from the pipe hot water 4 to the mixed water line 12 through the orifice 10 of the hot water valve, while the cold water flows from the cold water line 5 to the line d mixed water 12 through port 11 of the cold water valve.

Hot and cold water are adequately mixed as they flow from the mixed water line 12 to the communication port 13. The resulting mixed water flows into the flow line 14 which communicates with the communication orifice 13, so as to cause the rotation of the valve wheel 15 while the mixed water flows through the flow pipe 14 (see FIGS. 1 and 2). The rotational force of the wheel of the rapidly rotating valve 15 is reduced to a predetermined level, while it is transmitted to the gear train on the shaft 16 'via the shaft 16 and its gear train. The rotational force thus reduced is transmitted to the camshafts 20, 20 at a low speed, in reverse to that described above, via the gears 19, 19 and the gears 21, 21 which are engaged with the gears 19, 19. As a result, the cams 22, 22 are also affected by a rotational movement in an opposite direction, so as to gradually modify the engagement positions of the curved surfaces in action 23, 23 of the latter by relative to the ends in action 27, 27 which are opposite to the surfaces in action 23, 23 on the valve stems 24, 24. When the positions of interruption of water flow on the curved surfaces in action 23, 23 of the cams 22, 22 are aligned with the ends in action 27, 27, as shown in FIG. 2, the orifice 10 of the hot water valve and the orifice 11 of the cold water valve are closed independently and together with the hot water valve 8 and the cold water valve 9. E n consequence, the flow of mixed water is interrupted after the supply of a certain quantity of it adjusted in advance. At the same time as the rotation of the camshafts 20, 20, the gear 19 is assigned a rotational movement forwards, so as to rotate the button rod 18 in the same direction, so that the button rod 18 and the button 25 return to their starting positions, those in which they were before the adjustment of the flow rate, so that they can be used for the following operation.

The present invention developed according to the description above offers the following advantages:

(1) The hot water valve and the cold water valve are arranged in opposition to each other on the main pressure side of the orifice of the hot water valve and the orifice of the cold water valve, and the valve stems of these valves are arranged separately, so as to be opposite the curved surfaces in action of the cams connected to the reduction mechanism. As a result, the amount of mixed water to be supplied which consists of the same amounts of hot and cold water can be easily adjusted to a desired level by simply operating the temperature control button. In addition, when the mixed water temperature is preset to a certain desired degree, the mixing valve can be used as is when it is necessary to use it repeatedly and under the same conditions. This avoids temperature adjustment operations.

(2) The hot and cold water flows are immediately and independently interrupted according to the quantitative supply of mixed water, aligning the switch positions5

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curved surfaces in action of the cams with respect to the action ends of the valve stems, with the positions in which the orifice of the hot water valve and the orifice of the cold water valve are respectively closed at the same time time the hot water valve and the cold water valve. Consequently, a liquid whose pressure is higher than that of another liquid does not flow to meet the latter, so that the flow of the latter is not discharged. It is for this reason that the interior of the water pipe does not become unsanitary and that the hot water is not expelled from the hot water tank.

(3) Unlike a conventional mixer tap in which a hot water pipe and a cold water pipe would communicate freely with a mixed water pipe and in which a liquid, the pressure of which would be higher than that of the other liquid, would flow to meet the latter, thus causing the re-s flow of the latter, the mixing valve object of the present invention is capable of closing separately and immediately the orifice of the valve d hot water and the orifice of the cold water valve at the same time as the quantitative interruption of the flow of mixed water. This is why the present invention can reliably prevent the backflow of hot and cold water either into the cold water pipe or into the hot water tank.

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3 sheets of drawings