RU2359163C2 - Thermostatic valve - Google Patents

Abstract

FIELD: valves and accessories.

SUBSTANCE: invention relates to shut-off valves and accessories, namely, to thermostatic valves incorporated with hot-water radiators. Thermostatic valve comprises a body, inlet and outlet chambers, shaft, valve and booster. The spring-loaded shaft and valve are arranged inside the body at the angle varying from -45° to +45°. The booster is mounted between the shaft and valve to interact with the cam follower and seats in contact with the valve. The valve communicates the inlet and outlet chambers to allow heat carrier to flow there between and interacts with the outlet chamber body. The outlet chamber makes the valve seat and accommodates the booster and cam follower. Note that it is sealed by membranes coupled with the valve. The inner body features through slots for heat carrier to flow from the inlet to outlet. The said booster may represent levers and an elastic element that features pre-sag towards the valve closing direction.

EFFECT: higher reliability.

3 cl, 6 dwg

Description

The invention relates to valves, and in particular to thermostatic valves for heating radiators.

A valve of this type is known from the description of patent DE No. 3529614, comprising a housing on which a rod protrudes outwardly through an oil seal to actuate a valve closure element, and an upper thermostatic part containing a thermostatic element (TSE) and a pusher moved by it, the pusher head interacts with the stem.

In most cases, TSE is filled in the form of saturated steam and works depending on the vapor pressure (which depends on temperature) or in the form of a liquid (and, therefore, works depending on its thermal expansion).

The stem performs reciprocating motion under the action of TSE, moving the valve from the closed position to the open. The compensation spring prevents the valve from breaking. Considering the valve resource (and the leading manufacturers claim ~ 1 million operations), the gland is the most vulnerable spot due to its wear and clogging with impurities contained in the coolant. Since the failure of the stuffing box leads to leakage of the coolant and the gulf of the room, the DS / EH 215-1 clause 5.1.6 contains a requirement for measures to replace the stuffing box during the operation of the valve.

The implementation of this regulation requires the overlap of the coolant line, at least partial drainage and qualified analysis of the valve.

An important role for fulfilling the regulatory function is played by the magnitude of the so-called “gain”, i.e. the displacement of the control valve when the temperature in the room changes by 1 ° C. The greater the gain, the smoother the regulation process and the greater the energy savings and ease of use of the thermal valve. The gain mainly depends on the filling material used by the thermostatic head, but also depends on the size and type of aneroid box, for example a bellows. The best gain values of the available thermostatic valves are about 0.35 mm / 1 ° C for steam fillers and from 0.2 to 0.28 mm / 1 ° C for liquid ones.

From the patent RU 2112270 C1, 05.27.1998 a thermostatic valve for a radiator is known, similar to that described (prototype), but having a greater gain. In it, the problem is solved by introducing a stroke amplifier between the pusher and the rod. The axial movement of the pusher is used to move the reinforcing element in the direction in which it is flexible. This entails the movement of the pusher and the rod relative to each other, as a result of which the full movement of the closing element is greater than the movement of the pusher.

At the same time, with the requirements to maintain the temperature with an accuracy of 2 ° C, regulation occurs within 0.5 mm of the TSE rod stroke and the influence of spring compression by the internal coolant pressure becomes significant. Standard DS / EN 215-1 p. 5.2.8 normalizes the dependence of the characteristic on static pressure, which should not exceed the value T = 1 ° C / 10 bar x Heat transfer medium, which at P = 10 bar is already a 50% error in the mode .

Thus, the prototype is also not without drawbacks in terms of stem sealing, which entails the possibility of leakage and the dependence of the valve characteristics on the magnitude of the working pressure.

The objective of the invention is to increase the reliability of the valve by eliminating the movable stem seal, as well as eliminating the dependence of the valve characteristics on the pressure in the coolant line.

This problem is solved in that in a thermostatic valve comprising a housing, an inlet and an outlet cavity, a stem, a valve, a travel booster, a spring-loaded stem and a valve are arranged so that the axis of the rod with respect to the axis of the valve is at an angle from -45 ° to +45 °, while a stroke amplifier is installed between the stem and the valve, which interacts with a pusher in contact with the valve, communicates the inlet and outlet cavities through the coolant and interacts with the outlet cavity body serving as a valve seat; the cavity in which the travel booster and pusher is located is sealed with membranes connected to the valve, and the inner case has through grooves for the passage of coolant from the input to the output.

The power amplifier can be made in the form of levers. The power amplifier can be made in the form of an elastic element having a preliminary deflection in the direction of closing the valve.

A section of a thermostatic valve is shown in FIG. 1 - the position is “open”, in FIG. 2 - View A, in FIG. 3 - the position is “closed”, in FIG. 4 - a variant of the valve with the location of the axis of the rod with respect to the axis of the valve + 45 °, in Fig.5 is a diagram of the valve with the location of the axis of the rod with respect to the axis of the valve at an angle of -45 °, Fig.6 is a variant of the valve with a travel amplifier in the form of an elastic element, where:

1 - housing;

2 - spring loaded sleeve;

3 - membranes;

4 - adapter for installing TSE;

5 - stock;

6 - spring;

7 - sealing gasket;

8 - inner case;

9 - a pusher;

10 - valve;

11 - input cavity;

12 - power amplifier;

13 - support;

14 - body of the outlet cavity;

15 - output cavity;

16 - grooves.

According to the invention, the problem is solved in that the thermostatic valve comprising a housing 1 with an adapter 4 for installing a TSE is configured to move the valve 10 at an angle with respect to the stem 5 from -45 ° to + 45 °.

The cavity with the pusher 9 and the driving amplifier 12 interacting with it, for example, of the lever type (converts the movement of the rod 5 into the movement of the valve 10) is tight with respect to the internal (filled with coolant) cavities 11, 15 due to the membranes 3 located coaxially to the valve 10 and allowing the valve 10 to be moved with respect to the housing of the outlet cavity 14 serving as a saddle.

The principle of operation of the thermostatic valve is as follows.

The thermostatic valve together with the thermostatic head installed on it is installed in the heating line before or after the radiator or converter to change the flow rate of the coolant depending on the room temperature.

The coolant enters the valve inlet cavity (11), flows through the grooves (16) and the adjustable gap between the valve (10) and the body of the outlet cavity (14), which is the seat of the thermostatic valve. Next, the coolant through the outlet cavity (15) enters the radiator.

When the temperature rises in the room, the thermostatic head acts on the stem (5), which through the travel amplifier (12) and the pusher (9) changes the position of the valve (10) relative to the body of the outlet cavity (14), reducing the flow area of the thermostatic valve.

When the temperature in the room decreases, the thermostatic head ceases to act on the stem (5) and, under the action of the elastic forces of the stretched membranes, the valve (10) moves away from the body (14), increasing the flow area and, consequently, the flow rate of the heat carrier through the heater.

The membranes 3 are made, for example, of rubber-fabric material capable of providing a significant resource, and the membrane area is the same to exclude the influence of the coolant pressure on the loading of the rod 5.

The angle between the axis of the stem and the axis of the valve (the direction of its movement) should be in the range from -45 ° to + 45 °, because within these limits, the displacement of the valve 10 will be greater than the displacement of the rod 5.

The inner housing 8, in which the stem 5, the power amplifier 12 and the pusher 9 are located, has through grooves 16 for the passage of fluid from the entrance to the exit.

Claims (3)

1. Thermostatic valve comprising a housing, inlet and outlet cavities, a stem, a valve, a travel booster, characterized in that the spring-loaded stem and the valve are arranged so that the axis of the rod with respect to the axis of the valve is at an angle from -45 to +45 °, while a stroke amplifier is installed between the stem and the valve, which interacts with a pusher in contact with the valve, communicates the inlet and outlet cavities through the coolant and interacts with the outlet cavity body serving as a valve seat; the cavity in which the travel amplifier is located and the pusher is sealed with membranes connected to the valve, and the inner case has through grooves for the passage of the coolant from the input to the output. 2. The thermostatic valve according to claim 1, characterized in that the stroke amplifier is made in the form of levers. 3. The thermostatic valve according to claim 1, characterized in that the travel amplifier is made in the form of an elastic element having a preliminary deflection towards the valve closing.

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