DK161473B - VALVE, ISAER THERMOSTAT VALVE FOR HOT WATER HEATER - Google Patents

Description

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DK 161473 B

The invention relates to a valve, particularly a thermostat valve for hot water heating systems, as defined in the preamble of claim 1.

By a known valve of this kind (DE-PS 33 00 623), the shaft bearing shaft in two places is passed axially through 5 housings which are housed in operation. For this purpose, the insert parts have annular inner projections, which with low clearance abut the shaft. The protruding proximity of the seat also serves as a support for the reset spring designed as a screw spring. A pin extends through a seal 10 insert. This pin attacks the transmitting force on the end of the shaft and sets it axially when the pin is displaced by an actuator on the outside, such as a thermostat set or a manually adjustable actuator.

15 In adverse circumstances, the free movement of the shaft may be hindered by deposits on the shaft and / or bearing surface. Depending on the water conditions, metallic salts such as lime can be deposited. The hot water may also contain dirt particles. As the guide gap must be narrow, 20, under adverse conditions, the freedom of movement of the valve stem can be inhibited already shortly after.

The sealing insert through which the pin is routed outward is practically the only closure member to be replaced from time to time. By insufficient lubrication in the insert 25, the service life can be significantly reduced. It is essential for the lubrication that the pin brings a film of water into the insert which supports the lubrication.

The object of the invention is to provide a valve of the kind described in the preamble, in which the axially guided shaft also maintains its free movement under adverse conditions and a lubrication ensures the seal in the sealing insert.

DK 161473 B | i 2:

This task is solved according to the invention as set forth in the characterizing part of claim 1.

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The slotted and punched disc has a high stiffness in the radial direction, but is freely movable in the axial direction. Therefore, there is no need for a relative movement between the shaft and the rim of the disc. This provides an unobstructed axial movement of the shaft with a good centric guide. The valve also does not tend to make noise. By means of the slit in the disc, a sufficient fluid connection is obtained between the valve compartment occupying the closure and the space between the disc and the sealing insert. This ensures that the latter compartment is constantly filled with liquid.

In addition, the disc acts as a kind of pump membrane, which acts to replace the water in the common room, thereby also reducing the danger of deposition. Deposits are unlikely on the perforated disc itself due to the movement of the disc.

In connection with valves, already slotted plate springs are known. According to OS-PS 2 634 123 they act on a closing piece of a valve adjustable by means of a screw, whereby spring arms serve as a movement multiplier. According to DE-GM 19 19 390, a piston influenced by the measuring pressure is displaced by a safety valve in a centering spring, which is designed as a ring and is provided with external arms for fastening.

25 According to U.S. Pat. No. 2 576 516, spring strips secured at the outer end to the housing serve to guide a valve stem. In all cases, a sealing insert is not provided which would improve function in the presence of the slotted disc.

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When the bearing element of claim 2 forms the reset spring, cost and space savings are obtained. In particular, the construction height can be reduced. At a given elastic material- J

all can have the desired spring characteristic in relatively large | * i

DK 161473 B

3 extent is selected by the number and dimensions of the slots.

The disc forms of claims 3 and 4 are favorable. However, other disc forms are also considered, for example in cross section 5, waveformed discs.

The spiral shape of claims 5 and 6 is advantageous. The longer the coil, the easier the disc deforms in the axial direction.

In the alternative according to claims 7 and 8, a disk with higher symmetry is obtained by the power transmission.

The further configuration of claim 9 results in a particularly simple construction. Only a guide disc is needed because the shaft at the other end is passed through the pin.

The invention is further explained below by means of preferred embodiments shown in the drawing which are shown in FIG. 1 is a longitudinal section through a valve according to the invention; FIG. 2 is a plan view of a first embodiment of a disc according to the invention in enlarged form, and FIG. 3 shows a varied shape of the disc.

In FIG. 1, a valve housing 1 is shown with inlet nozzle 2 and drain nozzle 3 which has a valve seat 4. Together with it, a closure piece 5, which is secured to a shaft 6. A valve insert 7 is provided at the upper end with a seal. 25, through which a pin 9 seals from the outside into the valve interior. Above this pin, as indicated by arrow 10, an actuation movement can be performed either by one

DK 161473B

4, a manual actuator or the like is transferred to the shaft 6. The pin 9 engages with its inner end 11 into a corresponding bore 12 of the shaft 6.

Furthermore, the shaft is provided with a sealing ring 13 which 5 cooperates with a sealing surface 14 of the valve insert 7 when the shaft 6 has reached its outer end position. In this position, the sealing insert 8 can be unscrewed without the system (eg a heating system) being leaked.

Near the closure piece 5 is a hollow flat disc 15 10 of resilient material. This with its outer rim 16 is firmly clamped between the valve insert 7 and the housing 1. Its inner rim 17 is located between a step of the shaft 6 and a ring spring 19 which is supported against a cover plate 18 by the closure piece 5. 2 shows a helical slot 20 extending over 720 °. Therefore, the outer rim 16 and the inner rim 17 are connected to each other over a relatively long bent spring strip. This gives free axial movement, taking into account the spring characteristics. At the same time, however, the hole 21 of the disc 15 remains radially unchanged so as to obtain a good axial guide of the shaft 6.

Due to the spring characteristics of the disc, a separate reset spring can be dispensed with.

In FIG. 3, another embodiment with a disc 22 is shown.

Here, there are three concentric slots 25, 26 and 27. between the outer rim 23 and the inner rim 24 There are therefore two intermediate rings 28 and 29. Between the outer rim ring 23 and the inner rim ring 24, the intermediate ring 28 is above two 180 ° offset sections 30 and 31 connected to the outer rim ring 23 and above 30 two 90 ° offset sections 32 and 33 with the intermediate ring 29. This in turn is over two sections 34 and 35, the position of which corresponds to the two sections 30 and 31, connected

DK 161473 B

5 with the inner rim ring 24. It is seen that here also a spring movement exists between the outer rim and the inner rim, so that the shaft held in the hole 36 is axially movable, while the hole 36, however, radially retains its position.

In operation, when the seal 13 is raised from the sealing surface 14, a common space 37 is provided in the valve, which is limited on one side by the washer 15 and on the other side by the sealing insert 8. When the disk is moved axially back and forth, 10, displacing or replenishing the liquid in the common room 37 with the result that some flow movement occurs. This adds new liquid to the inner end surface of the sealing insert 8, which improves the lubrication of the seal.

Where necessary, two or more of 15 such discs 15 or 22. may be fitted. It is also possible to use conical discs, corrugated discs or otherwise deviating from the planar shape.

Claims (9)

A valve, in particular a thermostatic valve for hot water heating systems, with a seat (4) carried by the housing (1) and a corresponding closing piece (5), which is supported by a 5 reset spring loaded axially adjustable over a predetermined stroke length (6), which is axially passed through at least one bearing element, whereby a sealing insert (8) is provided through which the shaft (6) or a shaft (9) coupled to the power-transmitting pin (9) is characterized in that the bearing-10 the element is formed by a hollow disc (15; 22), the outer rim (16; 23) of which is located on the housing (1) and whose inner rim (17; 24) is located on the shaft (6) and which the slot so that the inner rim can be displaced across the stroke length relative to the outer rim and 15 which limits a space (37) common to the sealing insert (8). Valve according to claim 1, characterized in that the washer (15; 22) consists of resilient material and forms the reset spring. Valve according to claim 1 or 2, characterized in that the disc is planar. Valve according to claim 1 or 2, characterized in that the disc is tapered. Valve according to one of Claims 1 to 4, characterized in that a slot (20) is provided which has a helical shape. Valve according to claim 5, characterized in that the spiral (20) extends at least over 360 °, preferably above 720 °. DK 161473 B Valve according to one of claims 1-4, characterized in that at least two approximately circular slots (25, 26, 27) are arranged and each intermediate ring (28, 29) remaining between two slots at least two in circumferential direction. 5 direction offset locations over each one section (30 - 35) are connected to both neighbors. Valve according to claim 7, characterized in that each intermediate ring (28, 29) at two 180 ° offset locations over each section is connected to one neighboring ring 10 and at two 90 ° offset locations over each section. is associated with the other neighboring ring. Valve according to one of claims 1-8, characterized in that the shaft (6) is guided axially by the end (15) by the washer (15) and at the other end by the pin (9).