DE1776081A1 - Control device for burners for liquid fuels - Google Patents

Description

Patent attorney 1 7 7 R Π Q 1

DipWng.K.Waither l // bUöl

t BERLIN 19

\ Bolivarallee 9 ' W / Vh-2391

TeUS04428S 9/17/68

Pilkington Brothers Limited, 201-211 Martins Bank Building, Water Street, Liverpool 2, Lancashire / England

Control device for burners for liquid fuels

The invention relates to a control device for burners for liquid fuels and is particularly intended for burners with high fuel pressure, such as those for industrial Heat treatment processes can be used.

For example, when heating continuously operated Glass melting port, two batteries of oil burners are placed on opposite side walls of the port and operated alternately for about 20 minutes, so that switched off for the same length of time between the individual burning times Times are *

A first difficulty arises when shutting off a shut-off valve in the fuel supply line to the burner, since the fuel in the fuel supply line between the fuel

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BATH ORIGINAL

shut-off valve and the burner continues to flow to the burner, especially when working with high fuel pressures. This does not interfere with the heating process, because brimera and Secondary air can be passed on to the burner. However, after the secondary air to the burner has been shut off, fuel still drips from the burner, which then burns only imperfectly and develops smoke. This is particularly unfavorable in glass harbors, because the inner wall of the port can be soiled, which can also have a harmful effect on the treated goods.

To overcome this serious difficulty, a variable volume chamber has been connected to the fuel supply line between the fuel shut-off valve and the burner. This variable-volume chambers consist of cylinders with a sliding therein K _o Lben, wherein the piston in the sense of an enlargement of the moving associated with the fuel feed cylinder volume with closed fuel shutoff. This results in a rapid lowering of the fuel pressure in the fuel supply line. The fuel is therefore sucked away from the burner, so that fuel dripping out of the burner is avoided.

Even if in this known design a dripping of fuel from the burner is prevented after the fuel supply is shut off, so there are the difficulties of a sufficient and permanent seal between the piston and the cylinder, especially when the fuel pressure and temperatures are proportionate are high.

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BATH ORIGINAL

The invention is based on the task of a Design the control device of the type mentioned in such a way that the fuel continues to drip when the fuel shut-off valve is shut off is avoided and movable seals are unnecessary.

The control device according to the invention characterizes through a fuel supply line containing a fuel shut-off valve and one with this between the fuel valve and connected to the burner with a sealed chamber resilient wall through a fuel shut-off valve Cooperating control device when the fuel shut-off valve is closed in the sense of increasing the chamber volume is moved automatically * It is useful if the control device opens the fuel shut-off valve Wall of the chamber moves automatically in the sense of reducing the chamber volume.

In a preferred embodiment of the invention it is provided that the flexible wall by a first Membrane is formed, 'which forms two chambers in a housing, one of which is connected to the fuel supply line, that the first membrane is mechanically connected to a second membrane is, which forms two chambers in a second housing, and that the control device via lines with the other three Chambers is connected, which contain selectively actuatable valves, which the movement of the diaphragms and thus the volume the chamber connected to the fuel supply line.

In another embodiment of the invention it is provided that the flexible wall cash by a squeezing], lying in a chamber and is formed against this sealed bellows, and the control device controls the pressure in a connected with the interior of the bellows pressure line and thus that of the bellows in the chamber controls displaced volume. If the fuel shut-off valve is closed, the control device causes the bellows to contract, thereby increasing the volume of the chamber connected to the fuel supply line

so that fuel from the fuel supply line from the burner is sucked into the chamber and a dripping of the fuel substance is prevented. If the fuel shut-off valve is geoff-I net, the flow of fuel to the burner allows the

- Control device influencing the expansion of the bellows, as a result of which the volume of the chamber connected to the fuel supply line is reduced, so that the system is ready for the next down; switching process is prepared. |

In a further embodiment of the invention it is provided that the sealed chamber has its interior ι a bellows is formed and the control device the pressure in a housing surrounding the bellows and thus controls the volume of the bellows. Initiated when the fuel shut-off valve is closed the control device expands the bellows and compresses it when the fuel shut-off valve is opened.

It is useful when stretching and squeezing of the bellows is supported by a plunger connected to one end of the bellows. Here the S-fcössel

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by a double "acted upon by the control device controlled piston be movable.

It is also provided that a pressure line from the control device via risers to both sides of the Piston is connected and is selectively connectable to the control device with a pressure medium source or an outlet. According to a further feature of the invention, Tjorgef & en, that the control device contains a control valve which cooperates with the fuel shut-off valve in such a way that that it is in a first position with the fuel shut-off valve open a pressure medium source connects to the pressure line, which reduces the volume of the fuel supply line connected chamber, and with the fuel shut-off valve closed in a second position this pressure line with connects to an outlet to increase the volume of this chamber.

It is also provided that the fuel shut-off valve and the control valve have a common actuator. It is advantageous if the control valve of

'Operated the actuator via a dead gear connection and from the first to the second position only at

j completely or essentially completely closed fuel j shut-off valve is movable,

\ Finally, it is provided that the control valve

is a slide valve with linearly movable »Vetttile slide valve and the dead passage connection from an arm on the fuel shut-off valve actuating part of the actuator there is only one on the valve spool of the control valve

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Position of the fuel shut-off valve in the closed position acts.

In the drawing, exemplary embodiments of the invention are shown. In the drawing is

Pig. 1 is a schematic representation through a burner for a glass melting port, the equipped with a control device for the liquid fuel according to the invention is,

3? Ig. 2 is a schematic representation of the control device and

! Pig. 3 a section through a modified part

j the control facility.

A burner B is with fuel oil through a combustion \ feed line 11 and is supplied with primary air through an air line 12th The burner B is in the middle of the outlet one

! Line 13 for secondary air, which is in a side wall of a

j glass melting port enters.

A fuel shut-off valve 14 is in the fuel j

ι substance supply line 11 is provided. This has an adjusting lever 15 (Pig. 2), which has a slot 16 for receiving a pen 17 is provided at one end of a piston rod 18. The piston rod 18 is connected to a piston 19, _üer in one Cylinder 20 slides so that the opening and closing of the Fuel shut-off valve 14 from the position of piston 19 within the cylinder 20 is dependent. A movement of the piston 19 into the right end position in the cylinder 20, which is shown in FIG

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Fig. 2 is drawn in full lines, blocks the fuel shut-off valve 14 from, while with a movement of the piston 19 in the line position in the cylinder 20 shown in dashed lines lines is an opening of the fuel shut-off valve 14 is effected, so aase fuel oil via the fuel supply line 11 reaches burner B.

Two pressure medium lines 21 and 22 are connected to the cylinder 20, the line 21 being free from the piston rod Side of the piston opens into the cylinder 20, while the line 21 on the other side of the cylinder connected. Both lines open into the cylinder outside the path of movement of the piston 19.

A three-way valve 21a is switched on in line 21 and a corresponding three-way valve 22a is switched on in line 22, through which the lines are connected either to a common pressure medium source P or to the outside air.

The piston rod 18 carries a vertical arm 25 which, when the piston 19 is in position, corresponds to the closed position of the fuel shut-off valve 14 to the end of a! Acts valve slide 24, which is displaceable in a valve housing 25 against the force of a compression spring 25 '.

The housing 25 contains five control openings so are arranged to the valve slide that upon movement of the valve slide 24 to the right, a pressure medium line 26 from the Pressure medium source P is connected to a line 27, while j a line 28 is relieved via an outlet opening 29. at the return movement of the piston 19, the valve slide 24 is moved by the spring 25 * to the left. As a result, the line 26

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connected to a line 28, while the line 27 via a Outlet 30 is relieved.

Line 28 forks into two branch lines 28a and 2öb. The branch line 28a passes through a plate 31 of an enclosed chamber 32 and leads to the interior of a Bellows 33, which is attached to the plate 31 with its lower end. The upper end of the bellows 33 carries a plate 34 with the a plunger 35 is connected. The plunger 35 passes through a liquid seal 36 *. Through the plate 31 and is connected to a Piston 37 connected, which slides in a cylinder 38. The cylinder 38 is attached to the lower surface of the plate 31. The branch line 28b opens into the cylinder 38 below the Piston 37 so that the cylinder space below the piston 37 and the interior of the bellows 33 are always under the same pressure stand, which prevails in the line 28.

The line 27 opens into the cylinder 30 above of the piston 37 and above the top dead center of the piston. A conduit 39 connects the interior of the chamber 32, the; is outside the bellows 33, with the fuel supply line 11; between the burner B and the fuel shut-off valve 14. j

: The device described operates in the following j

* Wise

Secondary air is used first to turn on burner B. fed through the line 13, namely about j 14.15 m / min, and then primary air with a pressure of about j 5 * 6 kg / cm fed through the line 12. After that, that will Fuel shut-off valve 14 open and fuel oil at a pressure

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of 4> 2 kg / cm the burner B through the fuel supply line 11

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fed in, the primary air being fed in at about 2.26 nr / min will.

The fuel shut-off valve 14 is in the open position moved and held in this by the line 21 with the outside air and the line 22 with the pressure medium source P is connected, whereby the piston 19 in its left position is moved and held in the cylinder 20. The arm 2 3 on the piston rod 18 is then out of contact with the valve slide 24, which is moved into the line position in the housing 25 by the peder 25 'and thus the line 27 with the outlet 30 and the Line 28 connects to pressure line 26. Pressure medium is passed via the branch line 28b to the larger area of the piston and via the branch line 28a into the interior of the bellows 33 and the two upward forces cause the bellows 3i> to expand rapidly. The volume of the Chamber 32 connected to fuel supply line 11 is thus reduced to the smallest value.

To turn off the burner B, the valves 21a and 22a are switched over, so that now the line 22 with the Outside air and the line 21 with the pressure medium source P connected is. The pressure acting on the line side of the piston 19 moves it into its right-hand position in Pig. I. At this movement is the fuel shut-off valve 14 via the Piston rod moved to the closed position, so that the fuel supply Iet shut off via the fuel supply line 11 to the burner.

; Towards the end of the movement of the piston 19 comes the

Arm 23 to rest against the valve slide 24 and moves it '■ - - 10 -

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against the force of the spring 25 ¹ to the right, whereby the line 27 is connected to the pressure medium source P via the pressure medium line 26, while the line 28 is connected to the outlet 29. The interior of the bellows 35 and the cylinder space below the piston 37 are connected to the outside air, while pressure medium is fed to the cylinder 38 above the piston 37. This causes the bellows 33 to contract rapidly, as a result of which the pressure in the chamber 32 is lowered while its volume is increased rapidly, so that any fuel oil still present in the fuel supply line 11 is sucked into the chamber 32 so that no fuel oil is present after the fuel shut-off valve has been closed Burner can drip.

The bellows 33 provides an effective and quick

operating means for increasing the volume of the chamber 32 without the need for sliding seals in the chamber 32 filled with fuel oil. Through this training results a significantly longer service life of the device compared to the known devices in which sliding seals between piston and cylinder are required.

It is obvious that the invention can be embodied in a wide variety of forms and not in relation to the exemplary embodiment is limited. The application of the bellows; 33 can be done with any pressure means, so hydraulically or pneumatically. For example, the cylinder 20 may be part of a hydraulic system during the Bellows 33 and the cylinder 38 of a pneumatic system anger hear.

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In a modified form of the invention could For example, the arrangement of the bellows 33 in the chamber 32 be chosen so that the interior of the bellows 33 with the fuel supply line 11 is connected via line 39 and is therefore filled with fuel oil. The chamber 32 surrounding the bellows 33 is then connected to the branch line 28a. In another modified design, the bellows 33 could also be a membrane arrangement be replaced.

A modified design of part of the control device is shown in FIG. 3. Two identical housings 40 and 4-1 are attached to the ends of a frame 42. The housing 40 consists of two cup-like halves 43 and 44 »between which a flexible membrane 45 made of oil-resistant rubber is clamped with its edge. In the middle of the shell 44 is a Bearing 46 is formed through which a plunger 47 passes, the upper end 48 of which is liquid-tight with the center of the membrane 45 is connected. The lower end 49 of the bearing 46 is stepped and threaded into a threaded hole in the! the upper part of the frame 42 is screwed in and secured by a nut 50. j

The second housing 41 is designed in the same way;

forms and consists of two shells 51 and 52, »between which J a second flexible membrane 53 is clamped at its edge. | Pie upper shell 52 carries a bearing 54 in the middle, which is screwed into the frame 42 below and secured by a nut 55 is. A plunger 56 slides in the bearing 54 and is with his lower end 57 connected to the center of the second membrane 53 in a sealed manner.

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j The plungers 47 and 56 are axially aligned!

' and connected to one another by a turnbuckle 58, so that both membranes 45 and 55 are mechanically connected and can be moved together.

The upper chamber in the housing 40 between the shell 43 and the membrane 45 is connected to the fuel supply line 11 via a line 59, while the other chamber of the housing 40 is connected to the branch line 28a. The upper chamber of the housing 41 between the shell 52 and the membrane 53 is connected to the line 27, while the other , chamber is connected to the branch line 28b. The branch lines 28a and 28b are connected to one another as in the first arrangement, which lead to the control valve 25 in accordance with Pig. 2 leads.

When the burner is switched on, compressed air is fed via the line 28 into the lower chambers of the housings 40 and 41, the pressure being approximately A-, 2. kg / cm, while the upper chamber of the housing 41 is relieved via the line 27. In this position of the diaphragms 45 and 53, the over chamber i in the housing 40 has its smallest volume.

If the burner is shut off by closing the fuel shut-off valve 14, the control valve is in operated in the same way as in the first embodiment, so that the line 2ö is connected to the outside air, while Compressed air is fed via line 27 to the upper chamber in housing 41. Since the fuel shut-off valve 14 is closed is, the oil pressure in the upper chamber of the housing 40 corresponds essentially to the external pressure. The pressure in the upper chamber

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of the housing 41 causes a downward movement of the diaphragms 45 and 53, whereby the upper chamber in the housing 4ü on her largest volume is brought. As a result, fuel oil that is still present in the fuel is off feed line 11 into the upper chamber of the housing 40 sucked.

Both diaphragms 45 and 53 are made of a rubber that can withstand the high temperatures and the high fuel pressure has grown.

The control device according to the invention is special intended for the control of batteries of oil burners on opposite side walls of a continuous Glass melting port are arranged. These burner batteries are operated alternately for about 20 minutes each. Are the Burner of a battery in operation, so their exhaust gases from the glass port over the secondary air line of the parked i Burner discharged and these hot exhaust gases are passed through heat j storage, which consist of brickwork, and the heat j withdraw from the exhaust gases. When the burners are switched over, the secondary air for the burners that are now switched on is preheated.

If a battery of the burner is switched off, this is done in the following way.

1. The fuel supply to the burners is closed by closing of the associated fuel shut-off valve 14 in the fuel line 11 to the burners B blocked;

2. The supply of primary air to the burners is reduced to approximately the normal operating value;

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3. the secondary air is shut off.

If the burners of one battery are switched off,

they are located in the area of the exhaust gases from the burners in operation and the supply of primary air at reduced pressure

this is maintained in order to cool the turned-off burner and to prevent it from becoming clogged with foreign bodies or soot from the To prevent exhaust gases from the other burner battery.

If the shut-down burners are to be switched on, the supply of secondary air is switched on first, then the supply of primary air is increased and finally the associated fuel shut-off valve in the fuel supply line opened.

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Claims (12)

Patent claims: 1. Control device for burners for liquid fuels, characterized by a fuel shut-off valve (14) containing fuel supply line (11) and one with this connected between the fuel shut-off valve and the burner (B) sealed chamber (32j45 »43) with a resilient Wall (34; 4ij) through a shut-off valve with the fuel Cooperating control device (25) with the fuel shut-off valve closed in the sense of increasing the chamber volume is moved automatically. 2. Control device according to claim 1, characterized in that the control device (25) when opening the Fuel shut-off valve (14) the wall (34j45) of the chamber (32; 43, 45) automatically in the sense of reducing the chamber volume emotional. 3. Control device according to claim 2, characterized in that the flexible wall is formed by a first membrane (45) is formed, which forms two chambers in a housing (40), one of which is connected to the fuel supply line (11) is that the first membrane is mechanically connected to a second membrane (53) which is in a second housing (41) forms two chambers, and that the control device (25) over lines (20a, 28b, 27) connected to the three remaining chambers is that contain selectively actuatable valves that control the movement of the membranes and thus the volume of the fuel - 16 - 109824/0492 Control the chamber connected to the supply line (Pig. 3). 4. Control device according to claim 1 or 2, characterized in that; characterized in that the compliant wall (34) by a j compressible lying in a chamber (32) and against I formed this sealed bellows (33), and the control ^; device (25) the pressure in one with the interior of the bellows; connected pressure line (28a) and thus controls the volume displaced by the bellows in the chamber. > 5. Control device according to claim 1 or 2, characterized in that the sealed chamber is formed by the interior ■ of a bellows and the control device controls the pressure: in a housing surrounding the bellows and thus controls the volume of the bellows.
; 6. Control device according to claim 4 or 5 * thereby j marked that the stretching and squeezing of the j bellows (33) connected by one to one end of the bellows. I n pestle (35) is supported,
i 7. Control device according to claim 6, characterized by, that the plunger (35) can be moved by a piston (37) which is acted upon twice by the control device (25) is. 8. Control device according to claim J _1, characterized in that a pressure line (28) from the control device (25) via branch lines (28a, 28b) is connected to both sides of the piston (37) and from the control device (25) optionally to a pressure medium source (P) or an outlet (29) can be connected. - 17 - 109824 / ΓΗ92 9. Control device according to one of claims 3 Ms 8, characterized in that the control device contains a control valve (25) which cooperates with the fuel shut-off valve (14) in such a way that in a first position when the fuel shut-off valve is open, a pressure medium source (P) with the , connects the pressure line (28) the rringern a Y _e of the "volume of the fuel feed line (11) chamber connected (32; 43,45) conditionally, and with a closed fuel stop in a second position connects this pressure conduit with an outlet (29), to increase the volume of this chamber. 10. Control device according to claim 9, characterized in that indicates that the fuel shut-off valve (14) and the Control valve (25) have a common actuator (15-18,23). 11. Control device according to claim 10, characterized in that that the control valve (25) is actuated by the actuating organ, via a connection with dead gear, and from the The first can only be moved into the second position when the fuel shut-off valve (14) is completely or essentially completely closed 1st. 12. Control device according to claim 11, characterized in that the control valve (25) has a slide valve linearly movable valve seal (24) and the connection with dead passage from an arm (23) on which the fuel shut-off valve (14) actuating part (18) of the actuating member consists of on the valve slide (24) of the control valve (25) only in position of the fuel shut-off valve acts in the closed position. 109824 / rU92