DE536266C - Control device with auxiliary motor, continuously flowing control fluid controlled by a piston and relay - Google Patents

Description

GERMAN EMPIRE

ISSUED ON
OCTOBER 26, 1931

REICH PATENT OFFICE

PATENT LETTERING

JVI 536266 CLASS 47 g GROUP

Ruth accumulator A.-B. in Stockholm *)

Patented in the German Empire on July 21, 1920

There are control devices for valves that z. B. are installed in pipelines, known in which the valve is triggered by a stimulus, such as the change in pressure in front of or behind the valve, the change in a Speed, temperature or the like. Is influenced. This can be direct or indirect happen. The indirect regulation is the usual one. The control device is in

in most cases designed so that the excitation acts on a control piston, which regulates the flow of a hydraulic fluid to or from an auxiliary motor so that the Auxiliary motor adjusts the valve correctly. The excitation can also initially be applied to a relay act that adjusts the control piston for the hydraulic fluid.

If now when using these known devices the flow rate of the flowing medium is to be influenced by several stimuli at the same time and if z. B. In a system with heat storage, the requirement must be met, suggestions, which act in a certain sense to give a preponderance, d. H. with the simultaneous occurrence of opposite ones Suggestions to let the opening suggestions prevail, then one ordered so far usually a number of valves corresponding to the number of excitations. The valves were connected in parallel or in series so that the preferred excitation is always the Could control the flow of the agent. Attempts to make several suggestions on one Allowing a single valve to act did not have the desired effect. The known solutions that have become all have the disadvantage that the valve, as soon as several Suggestions are present, according to the arithmetic sum of the suggestions adjusts. So it can happen that Counteracting stimuli cancel and an actuation of the valve at all does not occur.

In many cases, especially when operating heat storage systems, such devices are useless, since the requirement must be met that the preferred Suggestions come into effect without restriction, so that z. B. be prevented

*) The following are named as inventors by the patent seeker:

Nils Frenne and Ake Saxberg in Stockholm.

can that consumers receive no steam or that a permissible pressure limit in the Memory is exceeded.

The invention relates to a control device which, using 'Relay, a continuously flowing control fluid and an auxiliary motor several stimuli Can act on a valve or the like, but the preferred suggestions always have the ίο unconditional predominance for the valve setting secures. According to the invention, this is achieved in that the stimuli acting in one direction (opening or closing) actuate the valve positively or positively, while the opposite active excitations (closing or opening excitations) are thereby rendered ineffective can be that the positive or positive connection of the transmission means is interrupted, so that with the simultaneous occurrence of several oppositely acting excitations in each case only one of the first suggestions (opening and closing suggestions) comes into effect. The figures illustrate solutions for using two exemplary embodiments the control device of the invention. It has been assumed that the valve van Pressure excitations is influenced, namely by the pressure before and from the pressure behind Valve. The suggestions can also be from temperatures, pressures and temperatures, speed and temperatures and going out to others.

In Fig. 1, the 'valve A is inserted into a pipe α through which a means z. B. flows from right to left. The valve is controlled in such a way that it closes when the pressure in line α falls upstream of the valve or increases downstream of the valve; it opens when the pressure in line α rises upstream of the valve or falls downstream of the valve.

From the line α , the pipes b and B _{1 lead} on each side of the valve A to the relays B and B ₁ . The tubes open into the bellows c and C ₁ with the end plates e and e _t , which are located in front of the mouths of the pressure fluid lines f and f ₁ . The springs d and (I ₁ press against the end plates . The outflows g and g _± can remove the amount of liquid that has escaped from the lines / and Z _1.

The lines f and J ₁ lead to the control piston housings C and C ₁ , in which the flow of the hydraulic fluid for actuating the auxiliary motors is regulated.

Ji or A ₁ denotes the inlet and Ji

or U ₁ the drain for the hydraulic fluid,

z. B. water from a pressurized water line i or I ₁ denotes the control piston which is firmly connected to the membrane I or I _1.

The spring ni or Tn ₁ presses against each membrane . η or% denotes the opening in each piston housing that is connected to tube 0 or O ₁ . The spaces p and P ₁ on the right-hand side of the pistons i and I ₁ are connected to the liquid drainage ports k and Ji ₁ through the channels q and q _x . The spaces r and T ₁ on the left side of the piston are through the drain openings j and S ₁ with the pipes f and f _± and through the channels ζ and Z ₁ with the inlet connector Ji and Ji ₁ in connection.

The pistons i and I ₁ have incisions t and t _x of such a length that the openings η and 1I ₁ either with the inlet h or Ji ₁ or with the outlet Ji or Ji ₁ , but not with the inlet and the At the same time. All tubes Ji _1, Ji ₁ , ₁ and 0, O ₁ open onto the piston i or

I ₁ in the annular grooves u and U ₁ .

In the drawing, the pistons i and I _{1 are shown} in their middle position.

The tubes o and O ₁ lead to the cylinders D and D ₁ , the pistons τυ and W _{1 of} which are loosely supported on the crosspiece y on the valve spindle 2 by means of the piston rods χ and X _1. The spindle 2 is held by the guide 4. The spring 3 mounted on the valve housing presses against the cross piece y.

The interaction of the individual parts takes place as follows:

Assuming that the pressure in line a downstream of valve A falls to the amount at which the control device should respond, then the pressure inside the bellows c also falls, and the outflow of the liquid from the pipe / is throttled because the spring d the end plate e presses against the mouth of the tube /. This increases the pressure in chamber r, because the liquid inflow to this space through channel ζ remains unchanged. The membrane / and the piston i connected to it are pushed to the left, so that the pressure pipe 0 comes into contact with the drain connection k through the incision t and the channels u. Part of the liquid thus flows out of the pipe 0 until the piston i has returned to its central position after regulation has been carried out. As a result, the spring 3 pushes the Ouerstück y and the associated spindle 2 upwards, provided that there is a smaller amount of liquid above the piston W _{1 of} the cylinder D ₁ , so that the piston rod X ₁ opposes the upward movement of the crosspiece y no resistance . The valve A opens, the pressure in the pipe part located behind the valve A rises to the prescribed level. The desired regulation has been implemented.

As soon as the pressure in the pipe α behind the valve rises above the set limit or in front of the valve drops in an impermissible manner, the discharge of the hydraulic fluid is released in the corresponding relay B 5 or B ₁ from the plate e or C _1. The pressure in the chamber r or T ₁ falls, and the spring m or W _{1 is} capable of the membrane / or I ₁ and the piston i or J _{1 connected to it}

ίο to press right. The inflow from the pipe h or H ₁ through the channels u or Zi ₁ and the opening η or M ₁ to the pipe ο or O ₁ is released. As a result, more liquid flows into the cylinder D or D ₁ , so that the cross piece y and the spindle 2 moves downward, the valve A is closed accordingly.

If the pressure upstream of the valve rises in the pipe α , a pressure increase occurs in the bellows C ₁ and in the chamber r _t . The membrane I ₁ with the piston I ₁ connected to it is moved to the left against the pressure of the spring M ₁ , so that the tube O ₁ comes into contact with the drain connection k for the liquid. The spring 3 can lift the crosspiece ν and the spindle 2. The valve is opened, provided that there is a smaller amount of liquid above the piston w of the cylinder D , so that the piston rod does not offer any resistance to the upward movement of the crosspiece y. In the event that two suggestions, e.g. B. from the pressure drop behind the valve and. are triggered by the pressure drop in front of the valve, then valve A is necessarily closed according to the excitation from the pipe part in front of the valve, which requires closing. A mutual influencing of the stimuli in their effect on the valve setting is excluded because the piston located at the lowest point determines the valve setting.

Fig. 2 shows a special embodiment for the control of the valve through

4-5 the auxiliary motors D and D ₁ , in which the piston rods χ and X ₁ are inevitably connected to the valve spindle 2 by the chains 4 and 8. The spindle 2 carries the sprocket 5 with two grooves for the chains 4 and 8. The weights 6 on the chains open the valve A as they descend, as soon as the pressure in the pipes 0 and O ₁ decreases. When one of the pistons w or W _{1 is} moved to the left, the corresponding chain rotates the wheel 5 and the valve is closed. Each closing stimulus unrestrictedly determines the valve setting.

The requirement to give the opening stimuli the predominance is in an embodiment according to Fig. 1 z. B. fulfilled in that the spring 3 on the one hand and the piston rods χ and X ₁ on the other hand swap the planes on which they attack the crosspiece y. In the embodiment according to Fig. 2, the direction of rotation of the spindle 2 would have to be reversed for opening and closing.

In a similar way, embodiments for more than two suggestions are also possible.

Claims (1)

Claim: Control device with auxiliary motor, continuously flowing control fluid controlled by a piston and relay, in which several stimuli act on a shut-off device, characterized in that the stimuli acting in one direction (closing or opening) actuate the valve (A) positively or positively while the oppositely acting stimuli (opening or closing stimuli) are rendered ineffective by the fact that the non-positive or positive connection of the transmission means is interrupted, so that if several opposing stimuli occur at the same time, only one of the first stimuli (closing or opening stimuli) becomes effective comes. go 1 sheet of drawings