DK175454B1 - Valve for a flow control device - Google Patents

Description

DK 175454 B1

Valve for a device for controlling a passage

BACKGROUND OF THE INVENTION 1. Field of the Invention The invention relates to a valve for controlling a passage with a valve housing having a spherical valve body rotationally symmetrically rotating about an axis of rotation and having a passage with at least one opening whose angular normal extends substantially perpendicular to rotation.

Due to state heat protection regulations and laws for residential 10 and purpose-built construction, new buildings are now being constructed so as to exhibit high thermal insulation. In addition, existing buildings are being refurbished so that better thermal insulation properties are achieved. In this way, the energy consumption for heat supply of the buildings, especially for heating water, is drastically lowered. As all district heating systems are operated with a high temperature difference between flow and reflux, the required amount of heat, and thus the amount of heating, becomes extremely low at the elevated heat insulation for heating a building. This amount is so low that previously known automatic hot water flow control valves can no longer be reliably inserted, since their resolution and setting conditions at the low flow rate no longer allow stable regulation. When these kinds of known valves are used, it results in further unstable, oscillating control circuits with extremely poor control conditions and through poor energy utilization.

25 For example, when heating a medium-sized dwelling, it is enough to have a heat supply of 7 kW. At a temperature difference between primary and reflux on the primary side, for example from 80 ° C, at 100% heating load hot water volume flow of about 75 liters per hour is obtained. This relatively small hot water requirement should be able to be reduced so that fine-sensing valve positions can be ensured in part load areas. For a desired dynamic range of eczema,

I DK 175454 B1 I

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In pelts 1:50, a safe and stable regulation is required at 1.5 liters per hour

You can be obtained. IN

In German utility model DE 79 31 893 U1, a ball valve with a swivel I is provided

In 5 spherical valve body arranged in a housing and which is provided with one in straight I

In-line and cross-sectional circular passage. The same goes for you

In the German utility model DE-GB 77 03 253. Here you can find volume and / or pressure I

In regulation, a circular aperture further formed in an insert for the housing, which you

You interact with the throughput. IN

I 10 I

In British Patent GB 2 115 112, a cylindrical passageway through an I

In spherical valve body, with a wedge-shaped opening, which opening has an I

At an angle of at least 60 °. IN

US Patent US 3,409,270 discloses a tap with a cylindrical I

In or slightly tapered valve body as an angular valve. The valve opening is I

In addition, formed as a wedge-shaped slot. IN

I Finally, German patent DE 41 43 306 C2 shows a ball valve with a housing and I

In a ball-shaped valve body therein, which has a straight-through passage,

In the basement of the axis of rotation. The spherical valve body is held tightly in I

In the house by metal-graphite-shaped gaskets, one annular I

In the packing of a coaxially arranged, and counteracting, ring spring I

You are pressed against the spherical valve body and the spherical valve member

In this case the pressure is pressed against the second annular gasket. Kugie- I

In the passage of the male as well as the opening to the passage of the spherical I

In the valve body, and the cooperating opening in the valve body exhibits a circular I

In cross section. Thus, the ball valve is only suitable for complete opening or closing

I ning, and not for controlling the flow depending on the angle of rotation. IN

I 30 I

DK 175454 B1 3

The invention therefore lies in the task of controlling a device for a passageway which operates at low volume flow safely in a large dynamic range. Furthermore, the object of the invention is to improve a ball valve as described above, so that it becomes possible to achieve a well-defined dependence between the angle of rotation and the through section and, consequently, a valve in an automatic control device which can be controlled from several control parameters.

Inventively, said task is solved by a valve of the type mentioned initially 10 having a valve body disposed in an adapted bearing in the valve housing consisting of two bearing bowls having an L-shaped passage through the valve body, the opening of the passage cooperating with an opening in one of the bearing bowls. wherein at least one of the openings is formed as a slot extending with defined cross-sectional dimensions in the direction of rotation about the axis of rotation.

Through a bearing arranged in the valve housing consisting of two bearing bowls, the inside of which is adapted to the valve body, ie. is designed as a potting surface, a single bearing with a smaller friction for the spherical valve body is obtained, with which it can drive change in the size of the passage opening with a relatively weak driving force. The formation of an opening whose perpendicular normal extends substantially perpendicular to the axis of rotation in the direction of rotation about the axis of rotation with defined cross-sectional dimensions allows for well-defined control or regulation of the cross-sectional dimensions of the passage. In particular, this ensures an accurate regulation of the cross-sectional dimensions of the passage depending on the angle of rotation of the valve body.

At the L-shaped, or angled, passage through the valve body with an orifice whose right-angled normal extends substantially perpendicular to the axis of rotation, it is further possible to add an additional

DK 175454 B1 I

valve for throttling or regulation on the basis of another flow control I

than the valve according to the invention regulates. In this way- I

they can, for example, be used for flow control on the basis of I

temperature measurement, while another valve serves for volume control. For over-

In accordance with this, a valve according to the invention can be inserted as a throttle

volume flow control device and adjustable temperature con- I

control. IN

Instead of using a regular linear working piston valve, I use

10, the invention provides a rotatable valve body which may be of basic design

shaped in a suitable rotationally symmetrical manner preferably formed as a ball.

Adjustable ball passages are known in connection with shut-off valves I

or ball valves; however, these serve to fully open or close I, respectively

a passageway, and not for the precise control or regulation of a passageway I

15 over a large dynamic range. In order to achieve this, the invention further discloses

is an aperture formed in the valve body itself, or in one assigned thereto

bearing having a precisely defined cross-section and especially in the periphery about I

the axis of rotation has a greater extent than the transverse direction (width) I

parallel to the axis of rotation. IN

20 I

After a desired control ratio, the width of the aperture may be constant over I

length or change over length in defined manner, especially linearly. In the last I

in case the opening takes the form of an elongated triangle. IN

In a preferred embodiment, the bed consists of a half-bowl, which is preferably I

interchangeable. The bearing is pressed against the valve body. As the bearing consists of half-I

bowls, one of the half bowls is elastically pressed against the valve body, and on I

this way this pressed against the other half bowl too. To deliver this I

pressures, for example plate springs, may be provided, for example, in I

30, and their bearings on a Seeger ring or the like

DK 175454 B1 5 de. The opening and receiving of the bearings of these surrounding valve bodies may thereby be a simple cylindrical bore in a valve housing.

In further preferred embodiments, the bearing may have substantially at least 5 partial spherical outer contours, or that the outer contour of the bearing is cylindrical, whereas in particular the valve body towards the inside of the bearing may consist of PTFE.

Further developments predict that the overall bearing is made of PTFE or that the bearing is made of metal especially bronze.

10

The valve body is preferably driven by an electric pivot drive, which is further controlled by a supply size, which may be, for example, one of a temperature sensor measured temperature.

Preferably, the angle of rotation of the valve body is limited by means of a stationary or site-fixed stop pin and a corresponding stop element on the valve body.

In order for the inventive device to be adapted to various operating conditions, a preferred further development indicates that the restriction of the turning angle is adjustable, in particular a serviceable adjusting device for limiting the turning angle is provided in the valve body. Specifically, this is realized in such a way that the adjusting device has a delta rim with a stop wall, at which the delta rim is adjustable from the outside by means of a toothed spindle.

In further development, an emergency setting function for the valve body may be provided, in particular a pre-tensioned coil spring on a swivel spindle grips the valve body to release the valve body from the drive in a safety location. The drive of the valve body can be connected by electromagnetic influence

DK 175454 B1 I

a decoupling spring acting in the direction of the electromagnetic influence

equipment. IN

When the inventive volume flow control device is to be used,

5, a further development provides a volume flow control device, thus

that the first valve assembly serves as differential pressure sensor for the other

the valve assembly, and so that in particular a diaphragm drive is provided, as I

is connected to a chamber and the inlet to the first valve, and a second I

chamber communicates with the outlet opening of the first valve. IN

10 I

Surprisingly, it has been found that the defined opening or guide opening, I

preferably, as I said, is designed as a small slit that is very insensitive

against soiling as the slit is flowed with relatively high I

flow rate so that dirt parts cannot be deposited in the circumference of the slot

15 advise. IN

The slot may be manufactured in various ways, e.g. using laser burners, I

erosion or punching in a pre-made bearing part, or through sintering I

or injection molding a pre-made bearing part provided with an I

20 slots. IN

The material for the bearing part can be selected in a suitable manner, e.g. consist completely

of reinforced or non-reinforced PTFE, or of a sintering material or of I

metal, the other materials being preferably coated with PTFE on their counter I

25 valve body faces. The bearing part preferably intervenes partially in a recess I

ring on a rotating spindle on the valve body. In this way the bearing part I

secured against its own turning. IN

Both the bearing part as well as the valve body are interchangeable, so that at replacement I

30 of the element with the defined opening, the device is easily adaptable to I

the desired installation conditions and applications. IN

When an additional valve, a piston valve for volume flow control, is provided, as mentioned, the first-mentioned pivot valve, whose actual task is, for example, temperature rise, further acts as differential pressure for the volume flow control. By means of the opening position of the first rotary valve, a desired value is set for the volume flow control.

The invention further provides a valve, characterized in that at least one rotationally symmetrical rotational axis (DR) and rotatable rotary valve body (DR) with a passage with at least one opening is arranged in a suitable bearing, the opening of which is perpendicularly normal. Substantially extending perpendicular to the axis of rotation (DR) and cooperating with an aperture in a bearing, at least one of the 15 apertures being formed as a slot extending in the circumference (U) about the axis of rotation (DR) with defined cross sectional.

Further advantages and features of the invention can be deduced from the claims and from the following description, in which embodiments of the invention with reference to the drawing will be explained in more detail. This view FIG. 1 is a schematic representation of a preferred installation site for the inventive device; FIG. 2 shows a preferred measure of the inventive device further in longitudinal section; FIG. 3 shows the inventive valve corresponding to arrow III in FIG. 2; 30

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In FIG. 4 in section through the adjustable restriction device corresponding to IV-I

In IV of FIG. 2; IN

In FIG. 5a shows a bearing part for a valve body of the valve invented corresponding to I

In the arrow A in FIG. 5b; IN

In FIG. 5b is a sectional view along B-B through bearing parts of FIG. 5a I

In FIG. 6a shows another measure of a bearing part corresponding to arrow E in FIG. IN

I 6b and 6c; IN

In FIG. 6b is a section similar to D-D through the bearing part of FIG. 6a; and in

In FIG. 6c is a side view of the bearing valve of FIG. 6a corresponding to the arrow C. I

I 15 I

For example, the inventive device 1 for regulating a passageway is in I

In a district heating supply inserted in a flow 2 or reflux 4 of the primary circuit I

In the course or supply line. 3 denotes the transition point of district heating to I

In a consumer, such as a rental house, the complete over- I

Furthermore, in the 20 pedestrian station may have a heat exchanger which reaches the two circuits I

In supply circuits 2, 4 and customer circuits 6 are physically separated, only I

In heat, or may be provided with suitable fixtures, such as reduction I

In valves, valves, etc., district heating flows from the district heating circuit 2, 5 di-

In physical, it is surrendered to the customer circuit 6. In the customer circuit 6 becomes-

In 25 ver consumers 7 connected. In addition, a control and regulation I is provided

In ring unit 8 for the example device 1 invented, as on the basis of I

In a temperature change from the temperature sensor 9 may be affected by the electrical

In tric drives. IN

I 30 A preferred measure of the inventive device management of I

The course of at least one valve is shown in FIG. 2. The device has an inlet 11 and I

An inlet 12. The inlet 11 and the outlet 12 communicate with the inverted rotary ball valve and a piston and piston valve 14 of a volume through-flow regulator 25, as well as a conduit 16 leading from the outlet 17.

5 Inlet 11, outlet 12, valves 13,14 and connecting line 16 are arranged in a solid valve housing 17.

In the illustrated embodiment, the rotary or ball valve 13 exhibits two bearing bowls 21, 22 having a spherical valve body 26 between them. For close abutment, the bearing bowls 21 facing at the inlet 11 are pressed against the valve body 23 by means of springs, here plate springs 24. whereby the counterpressure from the plate spring 24 is a clamped securing ring in the valve housing 17.

The valve body 23 exhibits an L-shaped passage 27 with an inlet opening 15 28 and an outlet opening 29.

The bearing bowl facing the valve inlet has an opening 31 in the form of a slot on which in the periphery U (Fig. 5b) about the axis of rotation DR of the valve body 23 extends, respectively, in the periphery U of the greatest longitudinal distance 20, while its width BR is directed in parallel. to the axis of rotation (DR) (Figures 5a-6c).

The passage 27 is arranged by means of two perpendicular bores arranged in the valve body 23 so that the openings 28, 29 have a circular cross-section. The diameter of the inlet opening 28 is at least as large as the maximum extent of the opening 31 of the half bowl 21, while the throughput characteristic is determined solely by the opening 31.

Basically, the defined aperture (here the aperture 31 of the half-cup 21) may also be formed in the valve body 23; the mapping of the defined opening 31 in the half-bowl 21 is easier to make and can be realized

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With greater accuracy than the performance of a corresponding opening in the mass

I ve metal valve body 23. I

The defined opening 31 can be performed in the half bowl 21 in widely different ways

In which, preferably through laser firing, the eroder, punching, sintering, spraying

In casting or the like. IN

In the material for the half bowls 21, 22, depending on the application, I is selected by I

In flow medium and of medium temperature. The half bowls 21, 22 can be I

It is made up of sintering materials, coated connecting materials or metals as extruded

In fine bronze. As a rule, the half-cups 21, 22 are on their interior towards the friend

In the body 23 facing side is coated with a PTFE layer for reducing friction; IN

Basically, in half bowls 21, 22 may be completely made of I

In PTFE. IN

I 15 I

In Figures 5a, b and 6a-c, various measures at half bowl 21 I show

I (half bowl 22 is similarly shaped). Half bowl 21, in Figures 5a and 1

In 5b, it consists entirely of PTFE. The half bowl has an inner contour 41 on which I

In the valve body 23, here a ball, is adapted so that the inner contour 41 remains

For 20 ver depicted as a sub-sphere or pothole surface. IN

In the passage 31, as mentioned in the embodiment of FIG. 5a and 5b et I

In the V or triangular passage with the main line direction in the periphery I

In U around the axis of rotation DR. The outer contour of the half bowl 21 of FIG. IN

In 5a, 5b is cylindrical; on the other hand, the receiving portion 44 of the pivot valve 13 in the valve has

In the housing 17, if necessary, a cylindrical bore, as can also be seen in FIG. 2. I

In the bearing cups 21 and 22 exhibit on their upper and lower sides, considered the angle I

In right of the main direction of passage 31, recesses 46, 47, I

30, the upper (46) of which acts as a drive for a drive spindle 51 in the drive gear 52,

The lower (47) of the outlet opening 29 of the valve body 23 is arranged opposite each other, respectively.

The inlet bearing bowl 21 is held tightly in the valve housing 17 by means of a sealing ring 48.

The drive and valve spindle 51 engages a triangular engagement end 153, in a correspondingly designed and adapted slot 38 of the valve body 23. In this way, the valve spindle can rotate the valve body 23 about the axis of rotation DR.

The turning gear 52 is preferably an electromotive turning gear which is controlled, for example, as already explained above by means of a temperature sensor, in particular by an outdoor temperature sensor 9.

15

The drive 52 may, as indicated in FIG. 2, provided with an emergency setting function. For this purpose, the pivot spindle 51 engages a biased screw spring 53 with its end 54 while the other end 56 is secured.

If the drive spindle 51 is disconnected from the electromotive drive, the spring 53, the drive spindle 51 and thus the valve body 23 rotate to a safety end position which is selected in the desired manner, as a rule, the passage from the inlet 11 to the outlet 12 is blocked, possibly allowing a minimum passage.

25

For example, a pivotal connection between the drive gear 52 and the spindle 51 is provided solely by the action of a piston electromagnet against the action of a spring force (all not shown); a current failure occurs, so that the pivot drive 53 can no longer control the valve setting of the valve 13, then the piston electromagnet is similarly extended, so that said spring is disengaged from the pivot spindle 51 and thus released,

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In that the coil spring 53 can effect the above-described effect at zero

In the dune setting function. IN

I In the embodiment of FIG. 2 shows the preferred embodiment of the inventive device

In addition, the adjustment angle of the spindle 51 and thus the valve body

I 23 restricted, however, maximum 90e; the actual angle of adjustment can in practice

Richly set in appropriate way. IN

I At the pivot spindle 51, a radial stop 61 is formed, which firstly I

In 10, a stationary stop 621 can be estimated in the form of a pin (Fig. 4). IN

In addition, a partial gear 63 extends with an outer tooth 64 on an I

In part on the periphery of the spindle 51, one extending radially to the spindle 51

At the end at 66, the second stop for the radial shoulder 61 (in Fig. 4 is shown by I)

In dotted line). IN

In the middle of the two in FIG. 4 is the radial shoulder 61, and thus the spindle I

In len 51 maximum adjustable. IN

In the tooth 64 of the gear ring 63, the tooth 64 is inserted into a tooth I inserted into the valve housing 17

I turn 66; this is provided at one from the outer accessible end wall 64

You are provided with an engagement recess 68, for example by means of one of I

In the screwdriver available slot, or an inner hexagon, at which the tooth neck I

In ken 66 can be adjusted or precisely rotated respectively. When turning the tooth I

In worm 66, with its cambered tooth 63, it is rotated on the one shown in FIG. 4 I

In the counterclockwise position about the spindle 51 and its rotation I respectively

In axis DR; hereby the actual setting angle of the spindle 51 and thus I can

I of the valve body 23 against those of FIG. 4 indicated 90 °, be reduced. IN

13 DK 175454 B1

Thus, the angle of adjustment of the valve body 23 is adjustable in the desired manner.

By adjusting the stop 65 provided against the tooth rim 63 to the shoulder 61, the maximum opening of the passage 27 is reduced. 5 The inventive device 1, in addition to the control valve 23 described above and its pivot drive 52, further comprises the said volume flow control device 25. This is constituted by the piston valve 14. with a valve seat 71 and a valve cone 72. The valve cone 72 is mounted by means of a membrane drive 73 on a control membrane 74 which is clamped in a membrane housing 10 76 and passed over a membrane plate 77, with which the valve cone 71 is firmly connected by means. of a valve rod 78.

By means of the valve rod 78, a control bore 79 is introduced into a first chamber 81 of the membrane drive 73, while a second chamber is connected by means of a control line 83 to the inlet 11 of the device 1. The control bore 79 leads to the outlet opening 29 of the turning valve. 13th

In this way, the turning valve 13 with the valve body 23 and the inlet bearing bowl 21 constitutes the pressure sensor for the volume flow control device 25.

20

This further exhibits a pressure spring 84 which serves to offset the pressure difference between the control line 83 and the outlet 29, and thus between the chamber 82 and the chamber 81 of the membrane drive.

The invention provides a device for controlling or regulating a flow, particularly in a district heating system and here in the flow or reflux of the supply circuit, which has a very accurate and sensitive control, as well as regulating the flow in a large dynamic range with the possibility of at a very low minimum throughput.

30

Claims (17)

A valve for a device for controlling a passage with a valve housing (17) having a spherical valve body (23) rotationally symmetrically rotatable about an I axis (DR) and with a passage (27) having at least one opening I ( 28) whose right-angled normal (EN) extends substantially perpendicularly to the axis of rotation (DR), characterized in that the valve body (28) is arranged in an adapted bearing in the valve housing (17) consisting of two bearing bowls (21, 22), in that the passage (27) of the valve body (23) is L-shaped, and by opening the opening (28) opening (28) of the 10 (28) cooperating with an opening (31) in one of the bearing bowls (21, 22). ), wherein at least one of the openings (28, 31) is formed as a slot extending with defined cross-sectional dimensions in the direction of rotation (U) around the axis of rotation (DR). IN Valve according to claim 1, characterized in that the longitudinal distance of the defined cross-sectional dimensions of the opening (31) in the direction of rotation (U) relative to the axis of rotation (DR) is substantially greater than the width (BR) of the opening I (31). parallel to the axis of rotation (DR). IN Valve according to any one of the preceding claims, characterized in that the cross-sectional dimensions defined by the opening (31) exhibit a constant width (BR) over its length. IN Valve according to one of claims 1 or 2, characterized in that the cross-sectional dimensions of the aperture (31) defined in 25 exhibit a linearly variable width over its length. IN Valve according to claim 4, characterized in that the defined cross-sectional dimensions of the opening (31) are designed as a triangle. IN 30 I 15 DK 175454 B1 Valve according to one of the preceding claims, characterized in that the defined cross-sectional dimensions of the opening (31) are formed in a bearing (21, 22). Valve according to one of the preceding claims, characterized in that the bearing cups 5 (21, 22) are interchangeable. Valve according to one of the preceding claims, characterized in that the bearing (21, 22) is elastically pressed against the valve body (23). Valve according to claim 8, characterized in that the bearing (21, 22) is pressed against the valve body (23) by means of a spring (24). Valve according to one of the preceding claims, characterized in that the bearing (21 *, 22 ') has substantially at least a partial spherical outer contour. 15 Valve according to one of claims 1-9, characterized in that the outer contour of the bearing (21, 22) is cylindrical. Valve according to one of the preceding claims, characterized in that the inner face of the bearing (21, 22; 21 ', 22') facing the friend body (23) consists of PTFE. Valve according to one of the preceding claims, characterized in that the total bearing consists of PTFE. Valve according to one of claims 1-12, characterized in that the bearing is made of metal, especially bronze. 14 I DK 175454 B1 I Patent claims: I Valve according to one of the preceding claims, characterized in that the bearing (21,22; 2T, 22 ') is retained against rotation in the valve housing (17). 30 I DK 175454 B1 I I 16 I Device according to one of the preceding claims, characterized by a pivot drive 11 (12) for the valve body (23). IN Device according to one of the preceding claims, characterized in that a volume I regulating valve (14) is in series with the first valve I Η I