Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F22—STEAM GENERATION
  • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
  • F22B1/00—Methods of steam generation characterised by form of heating method
  • F22B1/28—Methods of steam generation characterised by form of heating method in boilers heated electrically
  • F22B1/284—Methods of steam generation characterised by form of heating method in boilers heated electrically with water in reservoirs
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F22—STEAM GENERATION
  • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
  • F22B37/00—Component parts or details of steam boilers
  • F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
  • F22B37/26—Steam-separating arrangements
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F22—STEAM GENERATION
  • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
  • F22B37/00—Component parts or details of steam boilers
  • F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
  • F22B37/48—Devices for removing water, salt, or sludge from boilers; Arrangements of cleaning apparatus in boilers; Combinations thereof with boilers
  • F22B37/54—De-sludging or blow-down devices
  • F22B37/545—Valves specially adapted therefor

Definitions

• the invention relates to a steam generator for a ventilation system, for example, wherein the boiler is provided with one or more electrical heating elements and automatic control of discharging, flushing and water filling functions, as well as electronic regulation of the water level and a pressure-equalizing feed valve, the boiler also having a vapor-tight overflow via a discharge valve and a pressostat-regulated steam outlet, together with an operations regulator for controlling the various functions of the generator.
• the object of the present invention is to provide a pressure-regulated steam generator wherein during automatic discharge and flushing, the pressure equalizing feed valve produces a reduction of condensation in the distribution network. At the same time, the formation of bubbles during water heating is avoided and less moisture is introduced into the steam, even after repeated flushings.
• a steam generator of the above-defined type of a bubble suppressor in the form of two spaced apart, curved steel plates arranged one above the other and spanning the distance between the end walls of the boiler, a condensation separator with a return line to the boiler, and an operations regulator composed of three concentric rings wherein the outer ring has a plurality of symmetrical notches and can be moved by an electric motor via a gear and a resilient coupling arm, which by means of a fixed middle ring and an adjustable inner ring can automatically be engaged and disengaged from the notches in the outer ring as the motor rotates, in order to obtain suitable intervals for discharging, flushing and refilling water in the boiler according to the degree of water contamination.
• Figure 1 is a schematic drawing of a steam generator showing, in cross section, the boiler, insulation, electronic level regulator, vapor-tight overflow, and an automatic overflow valve and pressostat-regulated steam outlet.
• Figure 2 is a schematic cross section through the boiler, bubble suppressor, heating element and flushing pipe.
• Figure 3 is a vertical section through the operations regulator.
• Figure 4 is a horizontal section through the operations regulator of Figure 3.
• Figure 5 shows the feed valve in cross section.
• Figure 6 is a cross section through the valve housing of the open-close valve, showing the valve in the closed position
• Figure 7 shows the valve of Figure 6 in an open position
• Figure 8 shows the valve of Figure 6 in a cross section perpendicular to that shown in Figures 6-7.
• Figure 9 shows a cross section through a second embodiment of the valve of Figure 6.
• the boiler of the steam generator is provided with a heating element 2, a flushing pipe 3 which is connected to the water inlet 4 via a solenoid valve 5, and a bubble suppressor 6, as well as a pressostat-regulated steam outlet 7 downstream of a condensation separator 10 and an automatic discharge valve 8 in the form of an open/close valve in the water outlet 11.
• the generator has an overflow 9 connected to a level regulator 15, and the outlet 11 communicates with a feed channel from a feed valve 13 which is connected to the water inlet 4 via a solenoid valve 14.
• the electronic water level regulator 15 is connected to the outlet 11, and is also connected to the condensation separator 10, such that water is supplied both via the feed valve 13 and via the flushing pipe 3 and condensation separator 10.
• the bubble suppressor 6 consists of two spaced apart, curved steel plates 6a and 6b, arranged one above the other and secured to the end walls of the boiler 1.
• the bubble suppressor 6 is positioned a predetermined distance above the water level, and the lower steel plate 6a has longitudinal holes 17 in its middle section for introducing steam to the region between the plates.
• the upper steel plate 6b has condensation separators in the form of sloping plates 18 at the ends of the plate. Vapor containing large drops will thus condense and run down along the lower steel plate 6a in the axial direction of the boiler 1. The remaining vapor will flow past the edges of the upper plate 6b of the bubble suppressor and rise up along the boiler walls.
• a condensation separator 10 is provided for separating further vapor containing relatively large drops of water.
• This means consists of a U-shaped plate disposed at an incline above the steam outlet, the legs of the U pointing downwardly toward the steam boiler.
• the operations regulator is shown in greater detail in Figures 3 and 4.
• This unit has an electric motor 19 with a gear 20 which gives pins 21 a suitable speed of rotation, for example one revolution per hour.
• Attached to the pin 21 is a resilient coupling arm 22 which engages with notches in the outer ring 23 of the regulator and produces a displacement corresponding to the number of..notch intervals.
• This movement is adjustable by means of the inner ring 24 which can be displaced from point a to point b, increasing the distance from 1 to 6 intervals.
• the coupling arm 22 is lifted up from the notch at point b, sliding over a center ring 25 from a to b where it once again can engage with a notch in the outer ring 23 and guide the latter to position b, a displacement of 6 intervals or one complete revolution in the course of two hours. If the inner ring 24 is moved to position c, the coupling arm 22 will move the outer ring 23 only one interval, in other words, producing one revolution in the course of 12 hours.
• the outer ring 23 has a contact member 26 which during rotation in the course of a suitable period of time turns the electrical current on and off by means of micro- switches 27 and 28.
• the switches initiate the opening and closing process at the discharge valve 8, as well as the flushing and water filling functions via the solenoid valve 5.
• the inner ring 24 is secured to the bottom plate 29 by means of screws 30, but is rotatable in relation thereto via grooves 31.
• the outer ring 23 slides on the bottom surface 29, while the center ring 25 is secured to the bottom.
• Figure 5 shows the pressure equalizing feed valve
• the valve consists of a housing 101 with an inlet 102 in a plug 103 and an outlet 104 in a plug 105.
• a flexible end wall 106 is screwed into the valve housing 101 and secured to a spring means 107 and an adjustable cap 108.
• the cap has an adjustable sleeve 108a with a plug 109 which bears against a screw bolt lO9a and is movable in relation to a cone-shaped gate 110 by rotation of an eccentric disk 111.
• the cap 108 surrounds the conical gate 110 in such manner that a discharge chamber 112 between the inlet and the cap becomes reduced with increasing pressure and expands when the pressure in the inlet decreases.
• the eccentric disk 111 which is rotatable in relation to the spring means 107, can be controlled remotely via an electric motor and thereby influence the spring tension, which in turn affects the distance between the elastic plug 109 and the gate 110.
• the pressure equalizing valve operates in the following manner when it is utilized in the preferred embodiment, i.e., in a steam generator for a central heating system: Water under pressure flows in through the inlet 102 and out through the conical gate 110 toward the elastic plug 109 in the cap 108. The plug 109 and the cap 108 and end wall 106 are pressed against the spring means 107 at the same time as the electric motor turns the eccentric disk 111 into a position which results in the desired discharge quantity for the valve.
• the relative movement between the cap 108 and the conical gate 110 results in a reduction of the cross section of the discharge chamber 112 with . an increase in pressure and in an increase of the chamber cross section with falling pressure. This causes an equalization of the water flow through the valve in response to pressure variations in the feed line, because resistance to water throughflow increases with. rising pressure and decreases with falling pressure.
• the amount of water to be transferred from the inlet 102 to the oulet 104 via the cap 108 can thus be regulated by increasing or decreasing the spring tension, which in turn is determined by the position of the eccentric disk 111 in relation to the spring means 107.
• an automatic open/close valve 8 Connected to the outlet 11 of the boiler 1 on Figure 1 is an automatic open/close valve 8. This valve is shown in greater detail in Figures 6 and 7, in open and closed positions, respectively.
• the valve consists of a housing 201 with threaded caps 202 and 203 and a partition 204.
• An electric motor is connected to a shaft 205, which is attached to a disk 206 with a crank pin 207a freely movable in a frame 207 secured to a slide rod 208.
• This is connected to a valve body 209 by means of a gudgeon pin.210 which for ⁇ s a flexible securing means to the slide rod in the oval opening 211, as this rod end is supported against an elastic element 212.
• valve body 209 In the closed position, the valve body 209 is pressed against the outlet 213 by means of a wedge means 214b whose top section is held in tension between the elastic element 212 and a stop 214a, while during the opening and closing operation the wedge means moves in a groove 215a provided on each side thereof, inside the valve housing 201, cf.
• a wedge means 214b whose top section is held in tension between the elastic element 212 and a stop 214a
• valve body 209 is pushed toward the outlet 213, the wedge means 214 is stopped by a stop 214a in the form of a set screw, and this causes the wedge means to pivot and press the body against the outlet.
• valve To remove any contamination from flanges and other devices, the valve is provided with a flushing device 216.
• the valve operates in the following manner when it is used for periodic opening and closing:
• crank pin 207a will pull the frane 207 and the slide rod 208 away from the valve body 209 so that as the gudgeon pin 210 moves in the oval opening 211 it will dislodge the wedge means 214, releasing the wedge pressure against the outlet 213, and the valve is fully open when the crank pin reaches the outer position 218 and the motor is stopped.
• valve If the valve is to be closed, the power is connected and the disk 206 will be set in clockwise motion, the crank pin 207a will push the frame 207 and thereby the slide rod 208 and the valve body 209 toward the outlet 213 by means of the wedge means 214, and the valve is closed in the outer position 217 as the power is turned off.
• One end of the wedge means 214 is provided with rollers 214b which during the opening and closing movements roll in. grooves 215a in the .valve wall, said grooves being disposed on each side of the valve outlet 215.
• Figure 9 shows a second embodiment of the open/close valve wherein the valve gaskets 301 are lifted straight up in the closed position without subjecting the valve to friction wear, owing to the fact that the valve body is elevated at the same time as it is moved transversely of the outlet 313.
• This elevating effect is provided in that the slide rod 308 with the valve body 309 is pushed against a stop 314 in the form of a set screw.
• the valve body has a sloping underface which cooperates with a roller 314 carried on a rigid member 307. Owing to this configuration, when further pressure is applied against the valve body 309 after it has come in contact with the stop 314a, a wedge pressure will cause the valve body 309 to be lifted and press the gasket 301 into the closed position.
• the rigid member 307 is secured to a sleeve-formed body 306 which surrounds the valve body 309, the sleeve-formed body 306 thus forming a guide for the valve body 309, which also has a recess 304 for the slide rod 308, an elastic gasket 305 being provided in the recess 304 for receiving the impact of the slide rod movements 308.
• the slide rod 308 is retained in the sleeve 306 by means of a bolt 303.

Landscapes

• Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Thermal Sciences (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Life Sciences & Earth Sciences (AREA)
• Sustainable Development (AREA)
• Sustainable Energy (AREA)
• Control Of Steam Boilers And Waste-Gas Boilers (AREA)
• Devices For Medical Bathing And Washing (AREA)
• Cleaning By Liquid Or Steam (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=19886242

Family Applications (1)

Country Status (5)

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• 1981
  • 1981-09-28 NO NO813278A patent/NO813278L/no unknown
• 1982
  • 1982-09-28 DE DE19823249042 patent/DE3249042T1/de not_active Withdrawn
  • 1982-09-28 EP EP82902752A patent/EP0089349A1/de not_active Withdrawn
  • 1982-09-28 WO PCT/NO1982/000050 patent/WO1983001101A1/en active Application Filing
  • 1982-09-28 GB GB08312023A patent/GB2116683A/en not_active Withdrawn

Non-Patent Citations (1)

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