JPS6411872B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a thermostatic valve for use in particular in the health sector, which comprises a casing with a cold water inlet, a hot water inlet and a mixed water outlet, a control member for detecting temperature, and a thermostatic valve for use in the health sector. The present invention relates to a control piston which is axially movable together with said control member in order to limit the control gap on each side, and a sealing member sealing this control piston to the casing.

In known thermostatic valves of this type, the sealing element between the control piston and the housing consists of an O-ring. A relative movement occurs between this O-ring and the control piston or the housing during an axial control movement of the control piston. The accompanying frictional force causes wear of the O-ring, shortening its lifespan. Moreover, this design requires a large adjustment force for the movement of the control piston.

The object of the invention is to provide a thermostatic valve of the type mentioned at the outset, in which the wear of the sealing elements between the control piston and the housing is reduced as much as possible, and the adjustment forces required to adjust the control piston are reduced as much as possible. Our goal is to provide the following.

The gist of the present invention that solves this problem is a thermostatic valve that includes a casing with a cold water inlet, a hot water inlet, and a mixed water outlet, a control member for detecting temperature, and a control member for cold water and hot water. a control piston axially movable by said control member to limit on each side; and an annular elastic ring held on the inner circumferential surface of the control piston and on the outer circumferential surface of the casing to seal the control piston against the casing. In those types in which a diaphragm is provided, said diaphragm, together with the free edge of the member fixed to the casing, forms a valve seat creating a control gap for cold or hot water.

As a result of this arrangement, little relative movement occurs between the sealing element and the control piston, as well as between the sealing element and the housing.
As a result, no frictional forces and therefore no force losses and no wear occur.

It is particularly advantageous if the thermostatic valve also has a flow regulating function. This type of flow adjustment function is generally performed by changing the sum of the gap widths of the control clearances for cold water and hot water by moving the valve seat surface in the axial direction. In known thermostatic valves with a flow regulating function of this type, the cooperating valve seat surface is made of metal. Such a version provides an insufficient sealing effect in the fully closed position. In contrast, with the embodiment of the invention, if an elastic diaphragm is used as the sealing element between the control piston and the housing, this diaphragm can also be used as a valve seat surface. If the associated countervalve seat is pressed onto this diaphragm, the control gap is closed completely watertight.

It is advantageous if the diaphragm is made of rubber.
The inner periphery of the diaphragm can be fastened to the control piston by means of a hollow cylindrical threaded member.
Advantageously, the outer circumference of the diaphragm is clamped to the shoulder of the casing by means of an axially loaded hollow cylindrical element.

It is particularly advantageous if the diaphragm, together with the free edge of the part fixed to the housing, forms a control gap for the cold or hot water. The member fixed to the casing can consist of a cup-shaped insert screwed into the casing.

In the case of a thermostatic valve that has the function of changing the flow rate of mixed water by moving the valve seat surface in the axial direction, this movable valve seat surface is fixed to the casing at the outer periphery and axially moved at the inner periphery. It can be formed by another flexible annular diaphragm. A pressure ring is advantageously arranged in the region of deflection of the diaphragm, which pressure ring is moved axially from outside the casing.

In this case, this pressure ring can be loaded by a number of pressure pins distributed around the periphery and guided in an axially movable manner and projecting from the housing under sealing action. This pressure ring can be inserted into a member which is arranged axially movably on the neck of a member fixed to the casing.
In that case, it is advantageous if the part fixed to the housing consists of an insert screwed into the housing. In this case, the second diaphragm is clamped onto the shoulder of the housing by means of this insert.

The element which is axially movable on the neck of the element fixed to the housing is preferably provided with a ball rolling surface in the form of a helical winding, on which the bearing balls can roll; A helically wound counter-rolling surface is formed on a hand knob which is rotatably but axially immovably placed over the member with the ball rolling surface. According to this configuration,
Very little force is required when adjusting the flow rate.

Next, the present invention will be specifically explained with reference to the illustrated embodiments.

The illustrated thermostatic valve has a casing 1 which has a hot water inlet 2 and a cold water inlet 3.
and a mixed water outlet 4 for hot water and cold water.
Inside this casing 1, from the bottom as seen in the drawing,
A first insert 5 is screwed in and closes off the housing 1 from below. This insert 5 extends cup-shaped into the interior of the casing and is provided with a free edge 6. In the vicinity of the cold water inlet 3, the insert 5 is provided with a diameter reduction, by means of which an annular chamber 7 is formed between the housing 1 and the insert 5. Similarly, the diameter of the insert 5 is reduced in the region of the mixed water outlet 4;
An annular chamber 8 is thereby formed between the insert 5 and the casing 1. This annular chamber 8 communicates with the interior of the insert 5 via a through hole 9 . Moreover, this annular chamber 8 has O-rings 10, 11 from both sides.
is sealed to the casing by.

The insert 5 is provided with a cylindrical extension 12 projecting outward from the casing.
A manual temperature control knob 13 is screwed into the housing so as to be movable in the axial direction. A pressure pin 14 of an extension body 15 is supported on this temperature control knob 13, and this pressure pin 14 passes through an axial bore 16 of the insert body 5 under sealing action.

A second insert 17 is further screwed into the housing 1 from above, as viewed in the drawing. An annular diaphragm 19 is clamped between the lower edge of this insert 17 and the shoulder 18 of the housing 1 . A hollow cylindrical element 20 is supported on this diaphragm 19, which on the other hand presses a second diaphragm 21 onto a further shoulder 22 of the housing 1. In the region of the hot water inlet 2, an annular chamber 23 is formed between the component 20 and the casing 1, and this annular chamber 23 communicates with the interior of the component 20 via a through hole 24.

The insert 17 has a cylindrical neck 25 facing upward in the drawing.
A retaining ring 26 is fixed to the upper surface of the upper end of the neck 25 with a flange.

A cylindrical projection 27 is provided downwardly from the upper end of the neck 25 and is provided with a guide hole 28 for receiving the free end of the operating spindle 29 of the extension body 15 .

The inner peripheral part of the diaphragm 21 is an annular screw member 3.
0 to the control piston 31,
This control piston 31 is moved axially by the extension body 15 via the operating spindle 29, as will be explained below.

The control piston 31 has a cup-shaped interior chamber 32 which is accessible via a threaded member 30 . This inner chamber 32 communicates with an annular chamber 34 via a through hole 33 extending obliquely upward and outward, and this annular chamber 34 communicates with the control piston 31 .
It is installed from above on the approximately cylindrical upper part of the. This gives the control piston 31 a free edge 3
5, whose free edge 35 cooperates with the diaphragm 19 as a hot water valve seat, as will be explained in more detail below.

The operating spindle 29 of the extension body 15 is connected to the screw member 3
0, the control piston 31 coaxially passes through the cup-shaped inner chamber 32 and the axial hole 36 of the control piston 31.
into the cylindrical bore 37 of the neck 38 of the. The operating spindle 29 is provided with a step at the point where it projects into the cylindrical bore 37 of the neck 38, on which a first spring plate 39 is supported. A safety coil spring 40 is supported by this spring plate 39, and this safety coil spring 40 is compressed by a second spring plate 41 which is flared and fixed within the neck 38. This safety spring 40 is relatively strong, so that in normal operation the movement of the operating spindle 29 is limited to the control piston 31.
transmitted to. However, if the axial movement of the control piston 31 is prevented for some reason, the movement of the operating spindle 29 is taken up by the safety helical spring 40. In this way, the control piston 31
Damage to parts of the thermostatic valve is avoided even when movement of the thermostatic valve is prevented.

A spring plate 42 is mounted on the step of the neck 38 of the control piston 31 . This spring plate and insert 17
A coil spring 43 is compressed between the inner surface of the upper end portion of the safety coil spring 40 and is designed to be weaker than the safety coil spring 40. This coil spring 43 is connected to the operating spindle 29 and the control piston 3.
It maintains the correct frictional force with 1.

A pressure ring 44 is mounted on the diaphragm 19 and supports a plurality of pressure pins 45 distributed around its circumference. In the drawing, only one pressing pin 45 is shown.
These pressure pins 45 are pressed against the insert 17 under sealing action.
and is inserted into the annular cam member 46. This cam member 46 is disposed on the outer peripheral surface of the neck portion 25 of the insert body 17 so as to be movable in the axial direction.

The cam member 46 is formed with an upward spiral-wound cam surface 47, and the ball 4 passes over this cam surface 47.
8 rolls. The hand knob 50 (which will be explained later) is provided with a helical counter-rolling surface 49 for the ball 48, similar to the cam surface 47. The hand knob 50 serves to adjust the flow rate of the mixed water flowing out. This hand knob 50 is arranged above the cam member 46 so as to be rotatable but immovable in the axial direction. That is, on the one hand, the retaining ring 26
Axial movement in the other direction is prevented by, for example, the lower edge 51 of the hand knob 50.
is prevented by sliding along the stationary part.

The illustrated thermostatic valve operates in the following manner.

Hot water flows into the annular chamber 23 via the hot water inlet 2 . The hot water is further passed from the annular chamber 23 through the through hole 24 of the hollow cylindrical member 20 to the control piston 3.
1 through the control gap formed by the free edge 35 of 1 and the diaphragm 19.
It flows further into the annular chamber 34 of the insert 5 at the bottom of the drawing through the through hole 33, the cup-shaped inner chamber 32 and the threaded member 30.

Hot water is mixed with cold water within this interior chamber. Cold water flows into this inner chamber through the annular chamber 7 and the control gap between the free edge 6 of the insert 5 and the diaphragm 21.

The mixed water flows around the extension body 15 and flows out from the mixed water outlet 4.

The mixing ratio and thus the temperature of the mixed water is determined primarily by the ratio of the cap widths of the two control gaps. This ratio can be changed by turning the temperature control knob 13. When the temperature control knob 13 is turned, the entire control unit with the extension body 15 and the control piston 31 is moved in the axial direction. As the control piston 31 moves upwards in the drawing, the gap width of the previously mentioned control gap (at the diaphragm 19) in the hot water flow path decreases;
The gap width of the previously mentioned control gap (at the diaphragm 21) in the cold water flow path increases. As a result, the temperature of the mixed water flowing out is reduced without changing the amount. When the lower control piston 31 in the drawing is moved, the relationship of the control gaps described above is reversed, and the temperature of the outflowing mixed water increases.

The amount of mixed water flowing out is determined primarily by the sum of the gap widths of the two control gaps. The sum of both gap widths is the sum of the lower surface of the diaphragm 19 and the insert 5.
is defined by the distance between the free edge 6 and the free edge 6. This interval is adjusted by rotating the hand knob 50. When the hand knob 50 is rotated, a helical winding cam surface 47 and an opposing rolling surface 49 are rotated.
This causes axial movement of the cam member 46.
This axial movement is transmitted via the push pin 45 to the pressure ring 44, which causes the diaphragm 19 to deflect axially by the amount pushed. First of all, this only affects the gap width of the control gap for hot water. However, this short-term change in the temperature of the mixed water immediately causes the elongated body 15 to
This is compensated for by adjusting the movement of the control piston 31 by. Therefore, the ratio of the gap width of the control gap is ideally independent of the amount of rotation of the hand knob 50.

The hand knob 50 can completely block the outflow of the mixed water. In that case, the diaphragm 19 is connected to the free edge 35 of the control piston 31.
(as shown), and the diaphragm 2
1 is crimped onto the free edge 6 of the insert 5.

A significant advantage of using a diaphragm 21 instead of a conventional O-ring is that the control piston 3
The reason is that no frictional force is generated during the first movement. By virtue of the fact that the elastic diaphragm 21 is designed at the same time as part of the valve seat for the cold water, in other words in such a way that it limits the control gap for the cold water on one side, the cold water channel is shut off without leakage. . Similar advantages are obtained by using a diaphragm 19 in the control gap for hot water.

Since the ball 48 disposed between the hand knob 50 and the cam member 46 also functions as a ball bearing, the force required to adjust the amount of mixed water is reduced.

[Brief explanation of drawings]

The drawing is a longitudinal sectional view of one embodiment of the present invention. 1... Casing, 2... Hot water inlet, 3... Cold water inlet, 4... Mixed water outlet, 5... First insert, 6... Free edge, 7... Annular chamber, 8... Annular. Chamber, 9...Through hole, 10, 11...O ring, 1
2...Cylindrical additional part, 13...Temperature adjustment knob,
14... Pressing pin, 15... Extension body, 16... Axial hole, 17... Second insert body, 18... Shoulder, 1
9... Diaphragm, 20... Member, 21... Diaphragm, 22... Shoulder, 23... Annular chamber, 24
... through hole, 25 ... neck, 26 ... retaining ring, 27 ... protrusion, 28 ... guide hole, 29 ...
Operation spindle, 30... Threaded member, 31... Control piston, 32... Inner chamber, 33... Through hole, 3
4... annular chamber, 35... free edge, 36... axial hole, 37... cylindrical hole, 38... neck, 39...
Spring plate, 40...Safety coil spring, 41...Spring plate, 42...Spring plate, 43...Coil spring, 44
... Pressure ring, 45 ... Press pin, 46 ... Cam member, 47 ... Cam surface, 48 ... Ball, 49 ...
Opposing rolling surface, 50... Hand-cranked knob, 51...
edge.

Claims (1)

[Claims] 1. A thermostatic valve, comprising a casing having a cold water inlet, a hot water inlet, and a mixed water outlet, a control member for detecting temperature, and a control member for cold water and hot water on each side. a control piston movable axially by said control member to limit the control piston to the casing; In the type provided, said diaphragm 21
Thermostatic valve, characterized in that, together with the free edge 6 of the member 5 fixed to the casing, it forms a valve seat which produces a control gap for cold or hot water. 2. A thermostatic valve according to claim 1, wherein the diaphragm 21 is fastened to the control piston 31 by a hollow cylindrical threaded member 30 at its inner periphery. 3. The thermostatic valve according to claim 1 or 2, wherein the diaphragm 21 is fastened at its outer circumference to the shoulder 22 of the casing 1 by a hollow cylindrical member 20 that is loaded in the axial direction. . 4. Thermostatic valve according to claim 1, wherein the member 5 fixed to the casing comprises a cup-shaped insert screwed into the casing 1.