Single-lever thermostatic cartridge using ceramic disks
The cartridge comprises a body in which there is formed a mixed fluid chamber; a fixed disk; a movable disk; thermostatic regulation means including a regulation slide-valve and a thermostatic element which are mechanically connected to each other; and a single control lever for controlling the flowrate and the temperature of the mixed fluid and adapted to drive the movable disk in rotation and in translation and to move the thermostatic element inside the mixed fluid chamber. Cold fluid inlet passage and cold fluid return passage in the fixed disk extend approximately end-to-end in circumferential arcs with substantially equal radii and hot fluid inlet passage and the hot fluid return passage in the fixed disk extend approximately end-to-end in circumferential arcs with substantially equal radii. Application to the field of mixer taps.
1. A single-lever thermostatic cartridge comprising a body in which there is formed a mixed fluid chamber; a disk fixed relative to said body and provided with an inlet passage and a return passage at least for cold fluid and an inlet passage and a return passage at least for hot fluid; a disk movable relative to the fixed disk and provided with a cold fluid passage adapted to establish communication between the cold fluid inlet passage and the cold fluid return passage in the fixed disk and a hot fluid passage adapted to establish communication between the hot fluid inlet passage and the hot fluid return passage in the fixed disk; thermostatic regulation means including a regulation slide-valve in the mixed fluid chamber downstream of the cold and hot fluid return passages, and a thermostatic element at least partly inside the mixed fluid chamber and to which the regulation slide valve is mechanically connected; and a single control lever for controlling the flowrate and the temperature of the mixed fluid and adapted to drive the movable disk relative to the fixed disk in rotation and in translation and to move the thermostatic element inside the mixed fluid chamber, wherein the cold fluid inlet passage and the cold fluid return passage in the fixed disk extend approximately end-to-end in circumferential arcs with substantially equal radii, and in that the hot fluid inlet passage and the hot fluid return passage in the fixed disk extend approximately end-to-end in circumferential arcs with substantially equal radii.
2. A cartridge according to claim 1 , wherein the radii of the circumferential arcs of the cold fluid passages of the fixed disk and the radii of the circumferential arcs for the hot fluid passages of the fixed disk are substantially equal.
3. A cartridge according to claim 1 , wherein the fixed disk includes, for the same, cold or hot, fluid, a plurality of separate inlet passages and/or a plurality of separate return passages.
4. A cartridge according to claim 3 , characterized in that, for the same, cold or hot, fluid, the inlet passages and the return passages form an alternating succession of passages.
5. A cartridge according to claim 1 , wherein it includes a nut for controlling the temperature of the mixed fluid, which nut is rotationally coupled to the control lever and includes an annular flange in plane sliding contact with the movable disk and a cylindrical body on which the control lever is mounted to rock.
6. A cartridge according to claim 5 , wherein the thermostatic regulation means include a screw for adjusting the temperature of the mixed fluid, which screw is fixed against rotation relative to the body and received in a substantially complementary thread carried by the body of the control nut, the thermostatic element bearing against said screw.
7. A cartridge according to claim 1 , wherein an overtravel spring is disposed inside the mixed fluid chamber and between the regulation slide valve and the thermostatic element.
8. A cartridge according to claim 7 , wherein the overtravel spring is housed radially inside an exterior ring of the regulation slide valve.
9. A cartridge according to claim 1 , wherein it includes a member for generating turbulence having an irregularly shaped interior surface facing a temperature-sensitive portion of the thermostatic element.
10. A mixer tap equipped with a cartridge according to claim 1 , wherein it includes a handle fastened to the control lever of the cartridge for controlling the flowrate and the temperature of the mixed fluid.