CN2133761Y - Three-point adjustable boiler interlock safety appliance - Google Patents

Abstract

The utility model discloses a three-point adjustable boiler interlock safety appliance whose control box is composed of a casing, a front panel, a button and an indicator light which are arranged on the front panel, a circuit board and a relay which are arranged in the casing, and a socket connector which is arranged at the back of the casing. The control box is connected with a pressure sensor and a water level sensor through a signal transmission line. The pressure sensor is a three-point adjustable pressure gauge with electric contact. The water level sensor is an electrode water column device. The utility model has the advantages of small size, simple operation, long service life, high sensitivity and safety.

Description

Three-point adjustable boiler interlock safety appliance

The utility model relates to the monitoring of indexs such as a kind of air pressure that is adapted to Industrial Boiler and water level and 3 adjustable boilers interlocking protective devices of control.

" monitering and control system of industrial boilers " (application number is 88106069) of " boiler water level; steam pressure automaton " (application number is 88215476) of China's utility model patent communique bulletin on June 12nd, 1989 and Chinese invention patent communique the 6th volume o. 11th bulletin described a kind of technology that parameter indexs such as Water Level in Industry Boiler and air pressure are monitored respectively, yet, it is incomplete that they exist monitoring function, the security reliability of technology is poor, can not carry out the shortcoming of interlocked control, particularly to the superelevation water level, situations such as ultralow water level and superpressure lack effective surveillance and control measure, and level sensor is to have adopted the float contact, this sensor construction complexity, the mounting process complexity, the required precision height, supporting with it flat spring relay at high temperature, contact very easily sticks together, thereby easily causes misoperation.In addition, pressure sensor all uses 2 common adjustable contact pressure tables, but the contact current of this table big (＞20mA), the oxidation that very easily sparkles, so service life is short.

The purpose of this utility model just is to overcome the shortcoming of above-mentioned prior art, and a kind of 3 novel adjustable boiler interlocking protective devices are provided.This device should be able to be to the superelevation water level; situations such as ultralow water level and superpressure are carried out the secondary insurance; promptly to being higher than the superelevation water level of high water level; the ultralow water level that is lower than low water level is monitored with the superpressure state that is higher than upper limit air pressure; and implement effective stopping alarm control, the control object is air-introduced machine, air blast fire grate and water pump etc., and makes the interior contact current of input pressure table less than 1mA; reduce the ablation oxidation of contact, use this device should not destroy the topology layout of former boiler distribution board.The utility model also answers volume little, simple to operate, safe and reliable, long service life.

The utility model is to adopt following measure to realize its purpose.

3 adjustable boiler interlocking protective devices, its control box is by button on housing, front panel, the front panel and indicator lamp, the circuit board in the housing and the connector of relay and housing back are formed; Control box is connected with level sensor with pressure sensor by signal transmssion line.Pressure sensor is the adjustable electro connecting pressure gauge of bikini, and level sensor is an electric pole type water column device.Electric pole type water column device is a canister, and a through hole is arranged at the bottom of container, and an end cap is arranged at top, and positioned vertical has four electrodes different in size on the end cap, have insulating materials to be separated by between electrode and the end cap, and canister is equipped with earth connection.Three static contacts of the adjustable electro connecting pressure gauge of bikini are respectively air pressure lower limit contact, air pressure upper limit contact and air pressure superpressure contact, indicator rotation as moving electric contact can contact respectively with three static contacts, circuit board in the housing is by power circuit, superpressure warning circuit, superelevation water-level alarm circuit, ultralow water-level alarm circuit, add the water delay circuit, muffling circuit, alarm circuit, across-the-line starting circuit, secondary starting circuit, three grades of starting circuits, motor halt circuit, high water level termination of pumping circuit and low water level starting circuits are formed in parallel.

The drawing of accompanying drawing is described as follows:

Fig. 1 is the utility model structure connection layout;

Fig. 2 is the structural representation of electric pole type water column device;

Fig. 3, Fig. 4 are the front view and the sectional view of 3 adjustable electro connecting pressure gauges;

Fig. 5 is a circuit diagram of the present utility model;

Fig. 6 is an indicator light circuit connection layout of the present utility model;

Fig. 7 is output control connection figure of the present utility model;

Below in conjunction with accompanying drawing the utility model is further described.

Control box of the present utility model (33) is by housing (58), front panel (34), button (59) on the front panel (34) and indicator lamp (40) and clock (61), the circuit board (35) in the housing (58) and the connector (29) (30) of relay (36) and housing (58) back constitute, be connected by signal transmssion line (28) between control box (33) and pressure sensor (27) and the level sensor (32), the connector (30) of control box (33) housing (58) back can also pass through for example air-introduced machine of control line (31) and controlled device, air blast, fire grate is connected with water pump etc.The employed pressure sensor of the utility model (27) is the adjustable electro connecting pressure gauge of bikini, it belongs to YC series electro connecting pressure gauge, this table is provided with air pressure lower limit contact (62), air pressure upper limit contact (64) and air pressure superpressure contact (65), these three electric contacts are adjustable, movable contact (63) is under the driving of movement (22), with being rotated by the variation of governor pressure, can touch mutually with three static contacts (62) (64) (65) respectively, send the Monitoring and Controlling signal, and signal being transmitted main control box (33) by signal transmssion line (28), control box (33) drives the controlled device duty again by control line (31).The employed level sensor of the utility model (32) is an electric pole type water column device, its shell is a cylindrical metal container (43), the bottom of container (43) have one with boiler in the logical through hole (45) of water, an end cap (42) is arranged at top, end cap (42) is gone up positioned vertical four electrodes different in size (38) (39) (40) (41), the degree of depth of electrode (38-41) in canister (43) can be regulated, there is insulating materials (66) to be separated by between electrode (38-41) and the end cap (42), and canister (43) is installed with ground terminal (37), and ground terminal (37) is connected with control box (33) by signal transmssion line (28) with four electrodes (38-41).Four electrodes (38-41) are respectively superelevation water-level probe (41), high water level probe (40), low water level probe (39) and ultralow water-level probe (38), electric pole type water column device (32) are to utilize the electric conductivity of water (44) to make canister (43) and electrode (38-41) produce the state of through and off.Monitor the situation of change of water level thus, circuit board of the present utility model includes power circuit on (35), superpressure warning circuit (46), superelevation water-level alarm circuit (47), superelevation water-level alarm circuit (48), add water delay circuit (49), muffling circuit (50), alarm circuit (51), across-the-line starting circuit (52), secondary starting circuit (53), three grades of starting circuits (54), motor halt circuit (55), high water level termination of pumping circuit (56) and low water level starting circuit (57), foregoing circuit is parallel with one another, except that power circuit and alarm circuit, the basic comprising of foregoing circuit is by electric capacity, resistance and triode are formed the keying of electronic switch control relay, and every relay and a diode are in parallel.

It is such that the circuit of level sensor connects, relay J ₂Be to control relay J by electronic switch by the shortest superelevation water-level probe (41) ₂Normally-closed contact be connected in the water pump circuit; Relay J ₃Be to be controlled by electronic switch by the longest ultralow water-level probe (38), its normally-closed contact removes control relay J ₃, J ₃Normally-closed contact be serially connected in the air-introduced machine circuit; Relay J ₁₀Be to be controlled by electronic switch by high water level probe (40), its normally-closed contact is serially connected in the water pump circuit; Relay J ₁₁Be that low water level probe (39) is being controlled by electronic switch, its normally-closed contact removes control relay J ₁₂, J ₁₂Normally opened contact be connected in parallel on the starting of pump station button.Pump motor electrical control process is such: when water level was lower than low water level probe (39), resistance became big between electrode (39) and ground, relay J ₁₁Discharge normally-closed contact closure, relay J ₁₂Must be electric, it is connected in parallel on the normally opened contact closure on the starting of pump station button, contactor C ₁Get electric self-locking, water pump must be established the beginning by cable and go up water, and when water level rose to high water level probe (40), the resistance between electrode (40) and ground diminished relay J ₁₀Must be electric, its normally-closed contact that is connected in the water pump circuit disconnects contactor C ₁Dead electricity, the water pump dead electricity stops simultaneously.As certain reason J ₁₀When being failure to actuate, when water level rises to superelevation water-level probe (41),, relay J ₂Must be electric, its normally-closed contact that is connected in the water pump circuit disconnects contactor C ₁Dead electricity, the pump motor dead electricity stops to fetch water, and it is connected on the normally opened contact closure in the alarm (Q) in addition, and alarm (Q) sends chimes of doom.It is such that the circuit of steam pressure sensor connects, this sensor is that the electro connecting pressure gauge (27) of three adjustable points of the special processing of process is a upper limit pressure electric contact (64), threshold pression electric contact (62) and over pressure electric contact (65), when movable contact when to be indicator (63) with (62) point contact (lower limit), by the relay J of (64) point control ₆Must be electric, its normally opened contact is connected in parallel on the blower motor starting button, the normally opened contact closure of while J6, relay J ₇Time-delay 30 " after; its normally opened contact is connected in parallel on the starting button of air blast, relay J 8 time-delay 1 ' 30 " after electric, its normally opened contact is connected on the speed starting button of fire grate by fire grate speed change-over switch, when electric contact is a pointer (63) and (64) when joining, relay J ₉Must be electric, its normally-closed contact is connected in the air-introduced machine circuit.When electric contact is a pointer (63) and (65) when joining, relay J 1 electric, its normally-closed contact is connected in the electric wiring of air-introduced machine.

Steam pressure electrical control process is such: when pressure dropped to (62) point, pointer (63) joined relay J with (62) point ₆Must be electric, it is connected in parallel on the normally opened contact closure on the blower motor starting button, contactor C ₂Must be electric, simultaneously, blower motor gets electric starting, time-delay 30 " after, relay J ₇Must be electric, be connected in parallel on the normally opened contact closure on the blower motor starting button, contactor C ₃Electric, blower motor starting simultaneously, time-delay 1 ' 30 " after, relay J 8 electric, it is connected in parallel on the normally opened contact closure on fire grate (soon) starting button, contactor C ₄Electric, simultaneously fire grate gets electric starting, the conversion of fire grate speed, but based on fuel and combustion case change arbitrarily by fast, the slow switch of fire grate, when pressure rose to (64) point, pointer (63) joined relay J with (64) point ₉Electric, its normally-closed contact that is connected in the air-introduced machine circuit disconnects, blower motor dead electricity and stopping, the air blast fire grate is slagged tap and is also stopped simultaneously, no matter in the automatic or manual position, when certain reason makes pressure rising (65) point, pointer (63) is put with (65) and is joined, relay J 1 gets electric, and its normally-closed contact that is connected in the blower motor circuit disconnects, and the blower motor dead electricity stops, air blast, fire grate removes slag also simultaneously that dead electricity stops and sending sound and light alarm, has embodied the dual fail-safe effect of this instrument.

No matter manual or automatic, when certain reason makes water level drop to ultralow water-level probe (38), relay J ₃Dead electricity discharges, its normally-closed contact closure, J ₄; its normally-closed contact that is connected in the blower motor circuit disconnects, and the blower motor dead electricity stops, simultaneously; air blast, fire grate, slag tap, simultaneously dead electricity stops; at this moment no matter manually, automatically, the accident that causes because of the stove lack of water has been avoided in all fail to starts; when water level contact probe head (38); do not start air-introduced machine etc. at once, also need 1 minute the time-delay (promptly fetching water the time) after, could start air-introduced machine etc.In addition because electronic switch makes the electric current by contact in the Pressure gauge be no more than 1mA, so the electric contact pressure calendar life is prolonged.When in case of emergency, can realize urgent blowing out by urgent blowing out switch.

The utility model can be to the water level of boiler; parameters such as air pressure are carried out the secondary insurance; promptly to the superelevation water level; ultralow water level and superpressure state are monitored; and implement effective stopping alarm and control; the control object is air-introduced machine, air blast, fire grate and water pump etc.; and since the contact current in the input pressure table less than 1mA, so reduce the ablation oxidation of contact, the structure of the former boiler distribution board of the broken ring of the utility model; and volume is little; simple to operate, safe and reliable, long service life; highly sensitive, the efficiency of combustion of raising boiler.

Claims (4)

1,3 adjustable boiler interlocking protective devices, it is characterized in that its control box is made up of the circuit board in the button on housing, front panel, the front panel and indicator lamp, the housing and the connector of relay and housing back, control box is connected with level sensor with pressure sensor by signal transmssion line, pressure sensor is the adjustable electro connecting pressure gauge of bikini, and level sensor is an electric pole type water column device.

2,3 adjustable boiler interlocking protective devices according to claim 1, it is characterized in that described electric pole type water column device is a canister, a through hole is arranged at the bottom of container, an end cap is arranged at top, positioned vertical has four electrodes different in size on the end cap, have insulating materials to be separated by between electrode and the end cap, and canister is equipped with earth connection.

3,3 adjustable boiler interlocking protective devices according to claim 1, three breaks that it is characterized in that the adjustable electro connecting pressure gauge of described bikini are respectively air pressure lower limit contact, air pressure upper limit contact and air pressure superpressure contact contact respectively with three static contacts as the indicator rotation of moving electric contact.

4, according to claim 2 or 3 described 3 adjustable boiler interlocking protective devices, it is characterized in that described circuit board is by power circuit, the superpressure warning circuit, superelevation water-level alarm circuit, ultralow water-level alarm circuit, add the water delay circuit, muffling circuit, alarm circuit, across-the-line starting circuit, secondary starting circuit, three grades of starting circuits, motor halt circuit, high water level termination of pumping circuit and low water level starting circuits are formed in parallel.

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