CN201412825Y

CN201412825Y - Low-pressure boiler with full automatic water filling device

Info

Publication number: CN201412825Y
Application number: CN2009201194884U
Authority: CN
Inventors: 陈光焕
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-05-04
Filing date: 2009-05-04
Publication date: 2010-02-24
Anticipated expiration: 2019-05-04

Abstract

A low-pressure boiler with a full automatic water filling device comprises a boiler body. A water tower is arranged on the boiler body, a water filling tank and a steam-water conversion tank are arranged inside the water tower, the lower portion of the steam-water conversion tank is equipped with a water inlet, the upper portion of the water filling tank is provided with supercharging space and equipped with a drain pipe, a check valve I is mounted on the drain pipe, a steam supercharging pipe arranged in the water filling pipe is connected from a steam pipe to the boiler body, a superchargingvalve is arranged in the steam pipe, the bottom of the water filling tank is equipped with an outlet with three channels which are respectively controlled by a water filling valve, a steam-water conversion valve and a cool water filling valve, an excess pressure afterheat water return pipe is connected from the boiler body to the bottom of the steam-water conversion tank, a check valve II is mounted at the outlet of the excess pressure afterheat water return pipe, the upper portion of the water tower is connected with a running water pipeline, a ball float controller is mounted at the outletof the running water pipeline, an electric control cabinet and a water level controller are arranged outside the boiler body, and the supercharging valve, the water filling valve and the steam-water conversion valve are controlled by the water level controller, a power switch, an operating switch, a small-sized relay and three time relays. The low-pressure boiler can fill water without pumps.

Description

Low-pressure boiler with full-automatic priming apparatus

Technical field

The utility model relates to a kind of boiler, refers in particular to a kind of low-pressure boiler with full-automatic priming apparatus.

Background technology

Since Englishman watt has been invented steam engine two for over 100 years more than a hundred years, all boiler fills all are to rely on to accomplish that motor, water pump greater than boiler pressure finish.Along with the fast development of modern industry, not only use steam more wide as the industrial trade of the usefulness of power or heat exchange, the capacity of its boiler is also increasing.Though new and high technology, new material have solved difficult problems such as powerful motor manufacturing technology and HTHP water pump material, fail to change the method for boiler feedwater, cause the electric pump way of supplying water of boiler to be leveraged to the present always.High-pressure boiler is as one 100 tons boiler, and the separate unit power of motor of its feed pump just needs 3200 kilowatt hours, and year power consumption is up to more than 20,000,000 degree.As raise power plant for self-supply of subsidiary, four groups of 220 tons of boilers are arranged in running, its surprising feed pump power consumption well imagines, Quan Guo large-scale steam power plant, steel mill and even similar enterprises all over the world still more, and countless especially at 2 tons, 4 tons, 10 tons miniature boiler of usefulness.

Motor and water pump adds water, and bigger drawback is that it can't in time add back boiler with overbottom pressure steam, and when the water temperature that is added reached more than 60 ℃, it was just very difficult to add water, causes the boiler waste of steam rate in use of current every profession and trade generally to reach 10%-15% simultaneously.Though the producer that has takes back the pond with the water return pipeline of boiler, heat is dispersed in whole pond to the greatest extent and is equipped with among the water, round-the-clockly has little significance in heat radiation, only needs the hundreds of jin because add a water.Nearest " twin-tub " formula waste heat recovery new departure of being promoted on the market, it utilized is still high-pressure hydraulic pump and is equipped with heavy-duty motor the hot water of high temperature is clamp-oned the method for boiler firmly, equally not only power consumption but also consume equipment, only water pump quality difference.

Chinese patent once disclosed a kind of steam boiler with external automatic watering apparatus, and (publication number is CN2257351Y, open day 1997.07.02), its automatic watering apparatus is made up of float tank and valve box, float tank top has the vapor communication pipe to be communicated with pot body top, the bottom has feed pipe to be communicated with pot body bottom, float and float lever are fixed on the action lever of aperture ball-cock assembly, the aperture ball-cock assembly is installed on the interior valve bonnet of valve box, its upper end is set with the rubber removable cover that covers valve bonnet, the screen pack dust excluding hood covers whole aperture ball-cock assembly and valve bonnet, valve box one side has water inlet pipe, and blow-off pipe is arranged at the bottom.Higher when the boiler internal pressure, when water temperature is higher, it is difficult to water is added boiler.

Chinese patent once disclosed the external automatic watering apparatus of a kind of boiler, and (publication number is CN2299990Y, open day 1998.12.09), it includes float tank and aperture ball-cock assembly, there are vapor communication pipe, water communicating pipe to link to each other with water storage space with the vapor space of pot body respectively on the float tank, float and float lever are fixed on the action lever of aperture ball-cock assembly, the valve gap profile of aperture ball-cock assembly is a ring flange, be fixed on screw on the flange seat of float tank, the water inlet of aperture ball-cock assembly connects running water pipe, and delivery port connects bottom of pot body by feed pipe.Higher when the boiler internal pressure, when water temperature is higher, it also is difficult to water is added boiler.

Chinese patent once disclosed a kind of steam boiler and intake automatically that (publication number is CN2416353Y to device, open day 2001.01.24), comprise water storage cavity and the boiler replenishing water pipe that is positioned under the water storage cavity, it is characterized in that water storage cavity top is provided with intake antrum, water storage cavity is communicated with by the water inlet isolating valve with intake antrum, intake antrum chamber wall is provided with into water check valve, and the intake antrum top is provided with steam valve.It and running water pipe are connected, and need not electric pump, realize adding water automatically, but still the overbottom pressure waste heat in time can't be added back boiler.

The applicant once designed a kind of boiler (Chinese patent of built-in semi-automatic priming apparatus, publication number is CN2591519Y, open day 2003.12.10), comprise shell, burner hearth, it is characterized in that setting gradually storage tank from top to bottom on the top of shell, the preheating water tank, add water tank No. two, add water tank No. one, storage tank communicates with the preheating water tank, by a filler pipe, No. two filler pipes, No. three filler pipes, No. four filler pipes, water inlet pipe, a steam inlet pipe, No. two steam inlet pipes, steam source pipe connects, and often opens control valve by No. one, No. two normally closed control valves, often open control valve No. three, No. four normally closed control valves, often open control valve No. five, No. six normally closed control valves, often open control valve No. seven, No. eight normally closed control valve control.No matter how high its boiler stove internal gas pressure is, all at an easy rate water is added, not only energy-conservation but also easy to operate.Its semi-automatic priming apparatus is built-in.

The applicant once designed a kind of condensed water and melted down steam self pressure water filling device (Chinese patent, publication number is CN2684019Y, open day 2005.03.09) casing is divided into two places, one place is a storage tank, place and add water pot at another place, storage tank steam-out (SO) iron steam water filter condensing water conduit and condensed water check-valves and running water pipe and running water control ball valve, storage tank and add and be connected with blower line between the water pot upper part and often drive solenoid electric valve No. three, be connected with water inlet pipe and water inlet check-valves between the following position, add the water pot upper part and be connected with steam inlet pipe and normally closed solenoid electric valve that is connected with the boiler gland steam exhauster, following position is connected with filler pipe and No. two normally closed solenoid electric valves that are connected with the boiler fills mouth, a normally closed solenoid electric valve, No. two normally closed solenoid electric valves, often drive solenoid electric valve for No. three and connect power line.It need not high-pressure pump, and no matter the many height of boiler internal pressure also can easily add water in the stove.But find that in actual use the phenomenon of waste is arranged as the vapour source of the usefulness of power.

The applicant once designed a kind of full automatic self pressure water filling device for boiler, (Chinese patent, publication number is CN1858490, open day 2006.11.08), one casing is divided into two parts with fixed head, the bottom is divided into storage tank, place the steam cylinder in the middle of the top, steam cylinder both sides are placed with oil storage cylinder and work water pipe, the interface channel of oil storage cylinder and work water pipe is located at the bottom, the oil storage cylinder on the left side is communicated with its top with oil guide pipe with steam cylinder bottom, the oil storage cylinder top on the right is communicated with steam cylinder top, and pipe leads to the work water pipe in the steam, connects two in the steam between pipe and the high-pressure steam pipe and opens two pass conversion electromagnetic valves, storage tank top connects running water pipe, place in the middle of the storage tank and add the aqueous vapor cylinder, in the steam cylinder valve piston with add the aqueous vapor cylinder in big piston be connected, add that aqueous vapor cylinder one side is equipped with into the water check-valves up and down and opposite side is equipped with up and down and adds Water Check Valve, add Water Check Valve and connect filler pipe, two open two closes the conversion electromagnetic valve back and connects the working steam recovery tube and lead to storage tank.How high the water water temperature no matter it is added is, how high furnace pressure is, equally water added boiler.

The utility model content

The purpose of this utility model is to overcome the above-mentioned defective that prior art exists, and a kind of low-pressure boiler with full-automatic priming apparatus is provided, and how high water temperature much, that added have no matter its furnace pressure has, and all is easy to add water and goes into stove.It has saved the expense of motor, high-pressure pump and power consumption, can also in time the overbottom pressure waste heat be added back boiler.

For achieving the above object, the solution that the utility model is taked is: a kind of low-pressure boiler with full-automatic priming apparatus, it comprises boiler body, establish water tower on the boiler body, be provided with in the water tower and add water pot and carbonated drink conversion jar, a carbonated drink conversion jar bottom has water inlet, add water pot top and leave supercharging with the space and be provided with evacuated tube, the evacuated tube outlet warps slightly and is equipped with check-valves one, add and be provided with the steam pressure inlet in the water pot, the steam pressure inlet connects steam pipe to boiler body, the mid-pressure charging valve of steam pipe, add the water pot bottom and have outlet, exporting one the tunnel leads to boiler body and is controlled by priming valve, one the tunnel leads to carbonated drink conversion jar is controlled by the carbonated drink switching valve, one the tunnel leads to carbonated drink conversion jar by adding cold valves control, overbottom pressure waste heat return pipe connects to carbonated drink conversion pot bottom from boiler body, overbottom pressure waste heat return pipe exit is equipped with check-valves two, water tower top is connected to water supply pipe, the water supply pipe exit is equipped with float control, external electric cabinet of boiler body and water level controller, the built-in miniature relay of electric cabinet, first time relay, second time relay, the 3rd time relay, power switch is electrically connected with the running switch, the running switch is electrically connected with water level controller, water level controller is electrically connected with No. 3 contacts of miniature relay, 7 of running switch and first time relay, No. 8 contacts, 7 of second time relay, No. 8 contacts, 7 of the 3rd time relay, No. 8 contacts, pressure charging valve, priming valve, the carbonated drink switching valve is electrically connected, No. 4 contacts of pressure charging valve and first time relay, 1 of second time relay, No. 2 contact is electrically connected, priming valve is electrically connected with No. 3 contacts of second time relay, the carbonated drink switching valve is electrically connected with No. 4 contacts of the 3rd time relay, No. 1 contact of miniature relay is electrically connected with No. 3 contacts of the 3rd time relay, No. 8 contacts of miniature relay are electrically connected with No. 6 contacts of the 3rd time relay, 1 of No. 4 contacts of miniature relay and first time relay, No. 2 contact is electrically connected, 1 of No. 4 contacts of first time relay and second time relay, No. 2 contact is electrically connected 1 of No. 3 contacts of first time relay and the 3rd time relay, No. 2 contact is electrically connected.

Water tower uses as overbottom pressure waste heat recovery tower again, and boiler body is that the pump free dead weight water-adding jar uses as jug again, and carbonated drink conversion jar uses as the waste heat recovery jar again.

During first the use, elder generation manually opens and adds cold valves, and water is completely closed.When the water of water tower to adding the water pot added-time, check-valves one warps when installing slightly, the air of light pressure is discharged automatically.When water level controller drops to the water level of energising, send electricity to give miniature relay, miniature relay conducts electricity to first time relay by No. 4 normally open contacts, No. 4 contacts of first time relay send electricity to open pressure charging valve, steam is rapidly to supercharging space supercharging, when the pressure that adds water pot is identical with the boiler body internal pressure, second time relay is adjusted to No. 3 contact energisings (setting of time just), priming valve is opened in No. 3 contact energisings of second time relay, at this moment since the identical water of pressure aloft, pressure charging valve continues again to open wide, make to add water pot and boiler body has become same volume, vapour light-water heavy water adds water automatically toward lower stream.When the water that adds water pot has all added boiler body time of first time relay being adjusted to No. 3 contacts energisings send electricity to give the 3rd time relay (determining of time), at this moment pressure charging valve and priming valve Close All add the steam that has become N pressure in the water pot.The 3rd time relay received No. 4 contacts of power supply and opened the carbonated drink switching valve, the steam that adds in the water pot is sent forth in carbonated drink conversion jar rapidly, after pressure has dashed, the hot water of carbonated drink conversion jar returns automatically to adding water pot number and having water inlet to continue the cold water in the water tower is added to adding water pot, to the root of evacuated tube, (stay this supercharging with the usefulness of space for supercharging) again arranged and do not gone out to air until full water.At this moment the 3rd time relay regulated in No. 3 contacts of energising (determining of time), No. 3 contacts of the 3rd time relay send electricity to give No. 1 contact work of miniature relay, when No. 4 contacts of miniature relay one outage oneself power supply just again, so recovery at once.Moment in outage is started anew first time relay, second time relay, the 3rd the whole zero clearings of the time relay.Go round and begin again like this, add water until boiler body and satisfy, the beginning of next round is being waited in the water level controller outage.Overbottom pressure waste heat return pipe and check-valves are installed in the bottom that carbonated drink is changed jar, that is to say that elder generation with hot water add-back boiler body, avoids heat radiation.

This low-pressure boiler with full-automatic priming apparatus adds the water characteristics: (1) with boiler body as jug, when the pressure that adds water pot is identical with the boiler body internal pressure, second time relay is adjusted to No. 3 contact energisings (setting of time just), priming valve is opened in No. 3 contact energisings of second time relay, at this moment since the identical water of pressure aloft, pressure charging valve continues again to open wide, make and add water pot and boiler body has become same volume, utilize the physical principle that the vapour light-water is heavy, Water seeks its own level, realize adding automatically the purpose of water.(2) utilize boiler body, add water pot, carbonated drink conversion jar and carry out the carbonated drink conversion, reach continue to add water and not wasted heat finish the program that adds water.No matter it is how high that water temperature much, that added that its furnace pressure has has, all be easy to add water and go into stove.It has saved the expense of motor, high-pressure pump and power consumption, can also in time the overbottom pressure waste heat be added back boiler.

Description of drawings

Fig. 1 is the present embodiment perspective view.

Fig. 2 is a present embodiment part-structure schematic diagram.

Fig. 3 is the present embodiment electrical block diagram.

Among the figure: 1, priming valve, 1-1, add cold valves, 2, pressure charging valve, 3, the carbonated drink switching valve, 4, boiler body, 5, water tower, 6, heat shield, 7, add water pot, 8, heat insulation tube, 9, pressure inlet, 10, the space is used in supercharging, and 11, evacuated tube, 12, check-valves one, 13, float control, 14, carbonated drink conversion jar, 14-1, hush tube, 15, check-valves two, 16, water inlet, 17, overbottom pressure waste heat return pipe, 18, water supply pipe, 19, manage on the controller, 20, water level controller, 21, water level pipe, 22, electric cabinet, 23, indicator lamp, 24, hinge, 25, door lock, 26, dodge gate, 27, the UPS uninterrupted power source, 28, leakage switch, 29, power switch, 30, backup circuit breaker, 31, the running switch, 32, alarm, 50, miniature relay, 51, the 4th time relay, 52, first time relay, 53, second time relay, 54, the 3rd time relay.

The specific embodiment

Referring to Fig. 1-Fig. 3, a kind of low-pressure boiler with full-automatic priming apparatus, it comprises boiler body 4, establish water tower 5 on the boiler body 4, be provided with in the water tower 5 and add water pot 7 and carbonated drink conversion jar 14, carbonated drink conversion jar 14 bottoms have water inlet 16, add water pot 7 tops and leave supercharging with space 10 and be provided with evacuated tube 11, evacuated tube 11 outlets warp slightly and are equipped with check-valves 1, add and be provided with steam pressure inlet 9 in the water pot 7, steam pressure inlet 9 connects steam pipe to boiler body 4, the mid-pressure charging valve 2 of steam pipe, add water pot 7 bottoms and have outlet, export one the tunnel and lead to boiler body 4 by priming valve 1 control, one the tunnel leads to carbonated drink conversion jar 14 by 3 controls of carbonated drink switching valve, one the tunnel leads to carbonated drink conversion jar 14 by adding cold valves 1-1 control, overbottom pressure waste heat return pipe 17 connects to carbonated drink conversion jar 14 bottoms from boiler body 4, overbottom pressure waste heat return pipe 17 exits are equipped with check-valves 2 15, water tower 5 tops are connected to water supply pipe 18, water supply pipe 18 exits are equipped with float control 13, boiler body 4 external electric cabinet 22 and water level controllers 20, electric cabinet 22 built-in miniature relays 50, first time relay 52, second time relay 53, the 3rd time relay 54, power switch 29 is electrically connected with running switch 31, running switch 31 is electrically connected with water level controller 20, water level controller 20 is electrically connected with No. 3 contacts of

miniature relay

50,7 of running switch 31 and first time relay 52, No. 8 contacts, 7 of second time relay 53, No. 8 contacts, 7 of the 3rd time relay 54, No. 8 contacts, pressure charging valve 2, priming valve 1, carbonated drink switching valve 3 is electrically connected, No. 4 contacts of pressure charging valve 2 and first time relay 52,1 of second time relay 53, No. 2 contact is electrically connected, priming valve 1 is electrically connected with No. 3 contacts of second time relay 53, carbonated drink switching valve 3 is electrically connected with No. 4 contacts of the 3rd time relay 54, No. 1 contact of miniature relay 50 is electrically connected with No. 3 contacts of the 3rd time relay 54, No. 8 contacts of miniature relay 50 are electrically connected with No. 6 contacts of the

3rd time relay

54,1 of No. 4 contacts of miniature relay 50 and first time relay 52, No. 2 contact is electrically connected, 1 of No. 4 contacts of first time relay 52 and second time relay 53, No. 2 contact is electrically connected 1 of No. 3 contacts of first time relay 52 and the 3rd time relay 54, No. 2 contact is electrically connected.

Referring to Fig. 2, the heat insulation tube 8 of described steam pressure inlet 9 outer covers.

Referring to Fig. 1 and Fig. 2, the described water pot 7 outer cover heat shields 6 that add.

Referring to Fig. 2, connect on the described water level controller 20 and manage 19 on the controller, lower accepting water position pipe 21, on the controller pipe 19 and water level pipe 21 respectively with the visual glass tube of boiler body 4 water levels up and down valve be connected.

Referring to Fig. 2, hush tube 14-1 is set, the noise that produces when alleviating the carbonated drink conversion in the described carbonated drink conversion jar 14.

Referring to Fig. 1, described boiler body 4 is provided with dodge gate 26 by hinge 24, and dodge gate 26 has door lock 25, and dodge gate 26 is provided with indicator lamp 23.

Referring to Fig. 1, described boiler body 4 built-in UPS uninterrupted power sources 27 do not cut off the power supply when guaranteeing to move.

Referring to Fig. 1 and Fig. 3, also built-in the 4th time relay 51 of described

electric cabinet

22,7, No. 8 contacts of the 4th time relay 51 are electrically connected with 7, No. 8 contacts, the running switch 31 of 7, No. 8 contacts of 7, No. 8 contacts of the 3rd time relay 54, second time relay 53, first time relay 52,1, No. 2 contact of the 4th time relay 51 is electrically connected with No. 3 contacts of water level controller 20,

miniature relay

50, and 3, No. 6 contacts of the 4th time relay 51 are electrically connected with alarm 32.When the 4th time relay 51 sent power supply here from receiving water level controller 20, delaying time once added the whole time that water satisfies, and did not report to the police if carry out when adding water in this phase.

Referring to Fig. 1 and Fig. 3, the also built-in leakage switch 28 of described electric cabinet 22, leakage switch 28 is prepended to power switch 29, reaches earth leakage protective purpose.

Referring to Fig. 1 and Fig. 3, the also built-in backup circuit breaker 30 of described electric cabinet 22, backup circuit breaker 30 is electrically connected with power switch 29, if when taking place to add water automatically, can enable standby pump water adding.

Referring to Fig. 1, described power switch 29, running switch 31, backup circuit breaker 30 are arranged in the dodge gate 26, are convenient to operation.

Claims

1, a kind of low-pressure boiler with full-automatic priming apparatus, it comprises boiler body (4), it is characterized in that: establish water tower (5) on the boiler body (4), be provided with in the water tower (5) and add water pot (7) and carbonated drink conversion jar (14), carbonated drink conversion jar (a 14) bottom has water inlet (16), add water pot (7) top and leave supercharging with space (10) and be provided with evacuated tube (11), evacuated tube (11) outlet warps slightly and is equipped with check-valves one (12), add and be provided with steam pressure inlet (9) in the water pot (7), steam pressure inlet (9) connects steam pipe to boiler body (4), the mid-pressure charging valve of steam pipe (2), add water pot (7) bottom and have outlet, exporting one the tunnel leads to boiler body (4) and is controlled by priming valve (1), one the tunnel leads to carbonated drink conversion jar (14) is controlled by carbonated drink switching valve (3), one the tunnel leads to carbonated drink conversion jar (14) by adding cold valves (1-1) control, overbottom pressure waste heat return pipe (17) connects to carbonated drink conversion jar (14) bottom from boiler body (4), overbottom pressure waste heat return pipe (17) exit is equipped with check-valves two (15), water tower (5) top is connected to water supply pipe (18), water supply pipe (18) exit is equipped with float control (13), external electric cabinet of boiler body (4) (22) and water level controller (20), the built-in miniature relay of electric cabinet (22) (50), first time relay (52), second time relay (53), the 3rd time relay (54), power switch (29) is electrically connected with running switch (31), running switch (31) is electrically connected with water level controller (20), water level controller (20) is electrically connected with No. 3 contacts of miniature relay (50), running switch (31) and 7 of first time relay (52), No. 8 contacts, 7 of second time relay (53), No. 8 contacts, 7 of the 3rd time relay (54), No. 8 contacts, pressure charging valve (2), priming valve (1), carbonated drink switching valve (3) is electrically connected, No. 4 contacts of pressure charging valve (2) and first time relay (52), 1 of second time relay (53), No. 2 contact is electrically connected, priming valve (1) is electrically connected with No. 3 contacts of second time relay (53), carbonated drink switching valve (3) is electrically connected with No. 4 contacts of the 3rd time relay (54), No. 1 contact of miniature relay (50) is electrically connected with No. 3 contacts of the 3rd time relay (54), No. 8 contacts of miniature relay (50) are electrically connected with No. 6 contacts of the 3rd time relay (54), 1 of No. 4 contacts of miniature relay (50) and first time relay (52), No. 2 contact is electrically connected, 1 of No. 4 contacts of first time relay (52) and second time relay (53), No. 2 contacts are electrically connected, 1 of No. 3 contacts of first time relay (52) and the 3rd time relay (54), No. 2 contact is electrically connected.

2, the low-pressure boiler of the full-automatic priming apparatus of band according to claim 1 is characterized in that: the heat insulation tube of described steam pressure inlet (9) outer cover (8).

3, the low-pressure boiler of the full-automatic priming apparatus of band according to claim 1 is characterized in that: described water pot (7) the outer cover heat shield (6) that adds.

4, the low-pressure boiler of the full-automatic priming apparatus of band according to claim 1, it is characterized in that: connect on the controller pipe (19), lower accepting water position pipe (21) on the described water level controller (20), on the controller pipe (19) and water level pipe (21) respectively with the visual glass tube of boiler body (4) water level about valve be connected.

5, the low-pressure boiler of the full-automatic priming apparatus of band according to claim 1 is characterized in that: in the described carbonated drink conversion jar (14) hush tube (14-1) is set.

6, the low-pressure boiler of the full-automatic priming apparatus of band according to claim 1 is characterized in that: described boiler body (4) is provided with dodge gate (26) by hinge (24), and dodge gate (26) has door lock (25), and dodge gate (26) is provided with indicator lamp (23).

7, the low-pressure boiler of the full-automatic priming apparatus of band according to claim 1 is characterized in that: the built-in UPS uninterrupted power source of described boiler body (4) (27).

8, the low-pressure boiler of the full-automatic priming apparatus of band according to claim 1, it is characterized in that: also built-in the 4th time relay of described electric cabinet (22) (51), 7 of the 4th time relay (51), 7 of No. 8 contacts and the 3rd time relay (54), No. 8 contacts, 7 of second time relay (53), No. 8 contacts, 7 of first time relay (52), No. 8 contacts, running switch (31) is electrically connected, 1 of the 4th time relay (51), No. 2 contacts and water level controller (20), No. 3 contacts of miniature relay (50) are electrically connected 3 of the 4th time relay (51), No. 6 contact is electrically connected with alarm (32).

9, the low-pressure boiler of the full-automatic priming apparatus of band according to claim 1 is characterized in that: the also built-in leakage switch of described electric cabinet (22) (28), leakage switch (28) is prepended to power switch (29).

10, the low-pressure boiler of the full-automatic priming apparatus of band according to claim 1, it is characterized in that: the also built-in backup circuit breaker of described electric cabinet (22) (30), backup circuit breaker (30) is electrically connected with power switch (29), and power switch (29), running switch (31), backup circuit breaker (30) are arranged in the dodge gate (26).