DE3302514C2 - Device for controlling a pressure regulator - Google Patents

Abstract

A device for controlling a pressure regulator (211) comprises a pressure divider (209, 210) between a point (206) of high pressure and a point (207) of low pressure. The pressure divider consists of a fixed flow resistance (210) and a variable flow resistance (209), the value of which can be specified as a function of the medium flow through the pressure regulator or of the valve position of this pressure regulator. The pressure between the two flow resistances is used to control the pressure regulator. In this way, based on the differential pressure, a disproportionate control of the pressure regulator can be specified (FIG. 2).

Description

a) the element (102; 202) generating the pressure difference is connected in series between a feeding pressure source and at least one consumer (103; 3f &) ;

b) the valve (112; 212) and the pressure divider (109, 110; 2109, 210) each form bypasses to the Pressure differential generating organ; and

c) the drive (114,117; 214,217) of the valve (112; 212) is in operative connection with the variable flow distance (109; 209) to a disproportionate change in the variable flow resistance To cause the valve to open when the differential pressure increases.

2. Device according to steps things zh 1 with a piston or membrane Ani'ieb for acting on a closure member of the valve · characterized in that the drive (115.114) is mechanically connected to the variable flow resistor (109) and that the tap of the pressure divider (108) is guided on the drive (115) (Fig. 1).

3. Device according to claim 2, characterized in that that the variable flow resistance (209) from an adjustable throttle (224,225) consists.

4. Apparatus according to claim 1, characterized in that the pressure divider (209, 210) in the Pressure regulator (211) is integrated (Fig. 2).

5. The device according to claim 4, wherein the pressure regulator is one by a spring across a diaphragm and has a piston rod pressed against a valve seat closing body, wherein the Closing body is acted upon from the high pressure side and against the spring force from the valve seat can be lifted off, characterized in that the piston rod (214) has one with an adjustable one Throttle needle (225) has cooperating throttle bore (224), which the high pressure side (206) connects with the chamber (219) behind the membrane (217) and that a throttle opening in the membrane (217) (210) is arranged.

The invention relates to a device according to the preamble of patent claim 1.

Such a device is known from DE-AS 53 429. The known device aims a switch from a quantity control to a differential pressure control when the differential pressure between the flow and return of a heating system exceeds a certain predetermined value. To the Quantity control is a throttle arranged in the return of the heating circuit, tapping points in front of and behind the Throttles are guided to the drive of a flow control valve. Furthermore, a shut-off valve is arranged when the differential pressure between the flow and return increases above a predetermined value, open <: t becomes, whereby the tapping point of a pressure divider consisting of the shut-off valve and another throttle is practically connected to the pre-pressure, which pressure is also the drive of the flow control valve is fed.

In the case of differential pressure control, the known device works like a known one, between pre- and Return-switched differential pressure relief valve. Such differential pressure relief valves are also used in heating systems to keep the pressure of a circulation pump approximately constant and To avoid flow noises, which arise in particular due to the throttling of radiator valves, since the circulating pumps that cause the heating medium circuit have the property of increasing the delivery pressure to increase the low heating medium flow. The known differential pressure relief valves are are simple mechanical proportional controllers, in which, due to the remaining control deviation, with throttled heating medium circuit still occurs a disruptive pressure increase.

It is therefore the object of the present invention to design a device of the generic type in this way and to be installed in a heating medium circuit that a pressure difference set in normal operation at throttled circulation does not grow and in particular is lowered. The solution to this problem succeeds according to the characterizing features of claim 1. Further advantageous embodiments of the The device according to the invention can be found in the subclaims.

The invention is described below on the basis of exemplary embodiments illustrated in the figures of the drawing explained in more detail. It shows

F i g. 1 a first embodiment of the device according to the invention, in which the pressure regulator in a Bypass branch is arranged to a circulation pump; and

Fig.2 shows the first embodiment in the Function corresponding device in which all elements are integrated in the pressure regulator.

Fi g. 1 shows a heating medium circuit consisting of a feed line 101, a circulation pump 102, a throttled consumer 103 and a drain line 104. A bypass line 105 connects the pressure side of the circulation pump 102 with its suction side. Between a high pressure tap 106 on the pressure side and a low pressure tap 107 on the suction side is a pressure divider 108 consisting of a variable throttle resistor 109 and a fixed throttle resistor 110 arranged.

A known pressure regulator 111 consists of a valve 112, the closing body of which is not shown Way is pressed by a spring 113 against a valve seat. The spring 113 acts via a piston rod 114 on the closing body. The piston rod 114 is also in drive connection with a diaphragm drive 115, consisting of a housing 116, which is formed by a membrane 117 in two chambers 118 and 119 is divided and from which chambers the

The piston rod 114 is led out in a sealed manner The control pressure can be set by axially adjusting a spring plate 121, for example via a handwheel 120, and thus axially the bias of the spring 113 is changed.

According to an essential feature of the present invention, an adjustment member 122 is the variable Throttle resistance 109 with the piston rod 114 drivingly connected so that the throttle resistance 109 is reduced when the valve 112 opens. This results in the following mode of operation of the device according to FIG. 1: The pressure regulator 111 is set in this way that the valve 112 and thus the bypass branch 105 is closed when the throttled consumer 103 the heating medium circuit driven by the circulation pump 102 has a sufficiently low resistance opposed, however, if the consumer 103 is severely throttled, the circulating pump 102 counteracts this an increased resistance and the pressure increases on the output side of the circulation pump. This The increased outlet pressure takes effect via the throttle resistor 109 at the tap on the pressure divider 108. By being fed into the (+) chamber 118, that which is pretensioned by the spring 113 in the closing direction becomes “ Valve 112 opened When valve 112 is opened, the piston rod and a mechanical stroke are activated Connection 143 with the setting element 122 of the throttle resistor 109 reduces its resistance, so that the increased pressure is disproportionately effective in the (+) chamber 118 and the valve 112 becomes more effective is turned on than is normally the case with the increased pressure on the outlet side of the circulation pump 102 corresponds. The (-) - chamber 119 is connected to the low-pressure tap 107 in the example shown. In another application, this chamber could just as easily be connected to the atmosphere.

F i g. FIG. 2 shows a substantial part of FIG. 1 corresponding exemplary embodiment, with the same components are provided with the same reference numerals except for the preceding number 2. The changeable and the fixed throttle resistance 209 and 210 are integrated here in the pressure regulator 211. The variable throttle resistance 209 comprises a tube 224 passed through a closing body 223 and the membrane 217, which cooperates with an adjustable but otherwise stationary throttle needle 225 that connects the tube 224 the high pressure tap 206 with the diaphragm chamber 219. In contrast to FIG. 1 increases at the embodiment according to FIG. 2 the variable throttle resistance 209 when the closing body 223 lifts off its valve seat 226. The function of both devices remains the same. While according to Fig. 1, the pressure in the diaphragm chamber 118 is increased due to the reduced throttle resistance 109, according to FIG. 2 the pressure in the opposite diaphragm chamber 219 due to the enlarged Throttle resistance is reduced, which has the same effect, namely a disproportionate opening of the Valve 112 or 212 has the consequence. The fixed throttle resistance is provided by a throttle opening 210 in the so Membrane 217 is formed.

For this purpose 2 sheets of drawings

Claims (1)

Patent claims: 1. Device for controlling a pressure regulator, consisting of a valve with an assigned drive, wherein the degree of opening of the valve as a function of the difference between the pressure before and is controlled behind a pressure differential generating member and with one of one fixed and a variable flow resistance existing pressure divider between the High and low pressure side of the pressure-generating organ is switched and with its tap on the Actuating drive of the valve, characterized by the following features: