DK178469B1

DK178469B1 - Thermostatic valve

Info

Publication number: DK178469B1
Application number: DKPA201170196A
Authority: DK
Inventors: Evgeny Vyacheslavovich Denisov; Mikhail Vasilievich Luzgachev
Original assignee: Evgeny Vyacheslavovich Denisov; Mikhail Vasilievich Luzgachev; Joint Stock Company Teplovodoenergosberegajushie T
Priority date: 2008-10-06
Filing date: 2011-04-26
Publication date: 2016-04-11
Also published as: PL394609A1; PL212429B1; CN102171501A; DE112009002510T5; AT509272A3; RU2008139383A; AT509272A2; DK201170196A; RU2391593C1; CN102171501B; WO2010041976A1; AT509272B1; UA100779C2

Abstract

The object of the invention consists of an irnproved accuracy of heat-transfer-agent flow volume control by a thermostatic valve on account of the effect of the heat-transfer agent pressure being eliminated and the movable stern being released from the direct effect of the liquid pressure.

Description

A THERMOSTATIC VALVE

Technical Field

The invention relates to control equipment, more specifically, to thermostatic valves for heaters (radiators, convectors, and so on).

Background Art

Thermostatic valves are known according to, for example, RU 2182998, RU 2112270, RU 2191943, RU 2191310, DE 352961 and DE 19510530.

For example, the thermostatic valve disclosed in the specification to German patent DE 3529614 comprises a housing on which a stem is mounted to protrude outward through a gland for actuating the closing unit of the valve, an upper thermostatic part containing a thermostatic unit (TSU), and a pusher movable thereby, wherein the head of the pusher interacts with the stem.

The TSU may have fillings in the form of saturated steam and then operates as a function of steam pressure (which is a function of temperature), in the form of a liquid (and then it operates as a function of the thermal expansion of this liquid), or in the form of waxy materials.

The stem performs reciprocating motion under the action of the TSU, moving the valve from the open position to the closed one. A compensation spring protects the valve from being destine ted. Keeping in mind the useful life span of the Valve (the leading producers guarantee about one million operations), stem seals, which are made as annular-cross-sectioned rubber rings, represent the greatest vulnerability because of wearing caused by friction of rubber against the stem metal and exacerbated by impurities contained in the heat-transfer agent. Inasmuch as failure of seals results in leakage of the heat-transfer agent and flooding of the room, there is need in periodical not exceed a value of T = 1°C/10 bar, which constitutes, for P = 10 bar, as much as a 50% error of the 2°C maintenance accuracy.

This technical solution also suffers; from some drawbacks as regards stem sealing, entailing a possibility of leaks and, further, the responsiveness of the valve characteristic to the working pressure value.

Thus, all state-of-the-art items suffer from a common drawback, namely, they are unreliable on account of great wear and, further, their characteristic is responsive to pressure differences in the heat-transfer-agent mains.

DE 10119257 Al constitutes the closest art for the claimed technical solution, and was taken as such.

The closest art item comprises a movable stem which interacts with a thermostatic head and passes through a fitting, and a valve fitted with a gap relative to the seat, wherein the symmetry axis of the movable stem coincides with the symmetry axis of the thermostatic head and the fitting, and the non-liquid cavity is sealed with a flexible corrugated diaphragm.

In the prior-art solution, however, the movable stem while moving together with the diaphragm by a travel equal to the travel of the stem, separates from the foot on which it laid in the uppermost position, and a portion of the "separated" diaphragm is subjected to the force from the liquid pressure, and since the pressure can reach 10 at, a considerable force starts to act on the thermostatic head through the movable stem, thereby keeping the head, by virtue of the construction specifics thereof, from closing the valve:

Summary of Invention

The object of the invention consists of an improved accuracy of heat-transfer-agent flow volume control by a thermostatic valve on account of the effect of the heat-transfer agent pressure being eliminated and the movable stem being released from the direct effect of the liquid pressure.

The technical result is provided as follows: in a thermostatic valve comprising a movable stem which is positioned in a non-liquid cavity, interacts with a thermostatic head, and passes through a fitting, and a valve which is fitted with a gap relative to the scat, wherein the symmetry axis of the movable stem coincides with the symmetry axis of the thermostatic head and the fitting, and wherein the non-liquid cavity is sealed with a flexible corrugated diaphragm, the valve is equipped with a stroke amplifier as a lever which is mounted on the axis positioned in the non-liquid cavity, wherein the short arm of the lever interacts with the movable stem and the long arm thereof is under the action of a spring and is connected to the valve, and wherein the long arm of the lever passes through the corrugated diaphragm.

Brief Description of Drawings

Figure 1 schematizes the claimed thermostatic valve.

Best Mode for Carrying out the Invention

The thermostatic valve comprises a housing 1, an inlet 2, an outlet 3, a fitting 4, a thermostatic head 5, movable stem 6, a valve 7, a seat 8, a corrugated diaphragm 9, a spring 10, a stroke amplifier 11 as a lever having different arms, an axis 12, and a nonliquid cavity 13.

In the claimed thermostatic valve, the movable stem 6 interacting with the thermostatic head 5 passes through the fitting 4, wherein the symmetry axis of the movable stem 6 coincides with the symmetry axis of the thermostatic head 5 and the fitting 4.

The movable stem 6 interacts with the short arm of a stroke amplifier lever 11, which is mounted on an axis 12 positioned inside a non-liquid cavity 13. On the long arm of the stroke amplifier lever 11, a valve 7 is fitted with a gap relative to a seat 8 to provide the valve with a greater travel than the travel of the movable stem 6.

The axis 12 takes up the force from the pressure of the liquid (heat-transfer agent) that appears on the corrugated diaphragm 9, thereby releasing the movable stem 6 from the direct action of liquid pressure.

Inasmuch as the rolling friction coefficient does not exceed 0.05, the force with which the lever 11 presses the axis 12 creates an insignificant friction torque when the lever rotates around the axis and only insignificantly toads the thermostatic head, thereby considerably increasing the service life of both the thermostatic head and the thermovalve itself.

When the lever 11 rotates, the diaphragm 9 at the site where it is sealed to the lever performs no motions along the axis thereof; what is happened is mere deformation of diaphragm corrugations.

The present thermostatic valve operates in the following manner.

When temperature in the room increases, the thermostatic head 5 acts on the movable stem 6, moving it in the vertical direction. The movable stem 6 interacting with the short arm of the stroke amplifier lever 11 translates the motion of the movable stem 6 to the long arm of the stroke amplifier lever 11, thereby providing the travel of the valve 7 toward the seat 8 to decrease the gap between them. The liquid (heat-transfer agent) flow volume through the thermostatic valve and, thereby, through the heater device decreases to recover temperature in the room in accordance with the tailored value. When temperature lowers relative to the tailored value, the thermohead 5 stops acting on the movable stem 6 and the "valve - stroke amplifier lever - movable stem" system is returned to the initial position by a spring 10, which translates force through the stroke amplifier lever 11 to the movable stem 6 and the valve 7.

The air-tightness of a non-liquid cavity 13 in the housing 1 along the movable unit (the long arm of the stroke amplifier lever) is provided by a flexible corrugated diaphragm 9 which allows the force generated on the stroke amplifier lever 11 to be minimized.

Industrial Applicability A large-scale embodiment of the claimed thermostatic valve is not difficult to do using approved construction units and mature technologies.

Claims

Termostatisk ventil, der omfatter en bevægelig stamme (6), der er positioneret i et ikke-flydende hulrum (13), arbejder sammen med et termostatisk hoved (5) og passerer gennem en fitting (4); og en ventil (7), der er udstyret med et mellemrum i forhold til sædet (8), hvor den bevægelige stammes (6) symmetriske akse falder sammen med den symmetriske akse af det termostatiske hoved (5) og fitting'en (4), og hvor det ikke-flydende hulrum (13) er forseglet med en fleksibel korrugeret membran (9), kendetegnet ved, at den er forsynet med en slagforstærker (11) som en arm, der er monteret på en akse (12), som er positioneret i det ikke-flydende hulrum (13), hvor en kort del af armen (11) arbejder sammen med den bevægelige stamme (6), og en lang del deraf påvirkes af en fjeder (10) og er forbundet med ventilen (7), og hvor armens (11) lange del passerer gennem den korrugerede membran (9).A thermostatic valve comprising a movable stem (6) positioned in a non-liquid cavity (13) cooperates with a thermostatic head (5) and passes through a fitting (4); and a valve (7) provided with a space relative to the seat (8), wherein the symmetrical axis of the movable stem (6) coincides with the symmetrical axis of the thermostatic head (5) and the fitting (4) and wherein the non-liquid cavity (13) is sealed with a flexible corrugated diaphragm (9), characterized in that it is provided with an impact amplifier (11) as an arm mounted on an axis (12) which is positioned in the non-liquid cavity (13), where a short portion of the arm (11) cooperates with the movable stem (6) and a large portion thereof is actuated by a spring (10) and is connected to the valve (7). ), and where the long portion of the arm (11) passes through the corrugated membrane (9).