GB872662A - A monitoring means for fluid level indicators - Google Patents

A monitoring means for fluid level indicators

Info

Publication number
GB872662A
GB872662A GB3336258A GB3336258A GB872662A GB 872662 A GB872662 A GB 872662A GB 3336258 A GB3336258 A GB 3336258A GB 3336258 A GB3336258 A GB 3336258A GB 872662 A GB872662 A GB 872662A
Authority
GB
United Kingdom
Prior art keywords
contacts
relay
valve cock
float
contact
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB3336258A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Marshall Sons and Co Ltd
Original Assignee
Marshall Sons and Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Marshall Sons and Co Ltd filed Critical Marshall Sons and Co Ltd
Priority to GB3336258A priority Critical patent/GB872662A/en
Publication of GB872662A publication Critical patent/GB872662A/en
Expired legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01FMEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/30Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats
    • G01F23/56Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats using elements rigidly fixed to, and rectilinearly moving with, the floats as transmission elements
    • G01F23/60Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats using elements rigidly fixed to, and rectilinearly moving with, the floats as transmission elements using electrically actuated indicating means
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22STEAM GENERATION
    • F22BMETHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B37/00Component parts or details of steam boilers
    • F22B37/02Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
    • F22B37/42Applications, arrangements, or dispositions of alarm or automatic safety devices
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22STEAM GENERATION
    • F22BMETHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B37/00Component parts or details of steam boilers
    • F22B37/02Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
    • F22B37/42Applications, arrangements, or dispositions of alarm or automatic safety devices
    • F22B37/425Feed-water supply alarm devices using floats

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Water Supply & Treatment (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Level Indicators Using A Float (AREA)
  • Control Of Non-Electrical Variables (AREA)

Abstract

872,662. Indicating liquid-levels. MARSHALL SONS & CO. Ltd., and HOWE, C. A. Oct. 16, 1959 [Oct. 20, 1958], No. 33362/58. Class 123(1) In a monitoring device for periodically checking a float 20 in a float chamber 2 the latter is connected to a boiler shell 1 by a pipe 3 and a three-way valve cock 5. The latter is rotatable to connect any one of three branches 6, 7, 8 with either of the other two and is slowly rotatable by a non-reversible motor 14 acting through a reduction gear and drive unit 16 which reverses the direction of the valve cock 5 at the end of every 180 degrees of rotation. The unit 16 drives a camshaft 18 which controls contacts 18a, 18c, 18d, 18e in an electrical control circuit Fig. 4 a time switch 17 closing a contact 17a, approximately every four hours, to connect the motor 14 between phase and neutral lines 23, 24 so that the valve cock 5 rotates slowly in the direction of the arrow C and the initial rotation of the camshaft 18 closes contacts 18e, 18a, the latter maintaining the motor 14 energised when the time switch reopens the contact 17a, and opens a contact 18d. Should the float 20 be functioning properly and follow the drop of the level of the liquid in the chamber 2 when the valve cock 5 approaches the draining position, Fig. 2, contacts 22a of a switch 22 are opened so that a relay R 1 is de-energised contacts R1b of which are opened to interrupt the supply to a relay R 2 and open contacts R2a, R2b the latter de-energising a relay R4 which operates oilfiring shut-down mechanisms, not shown, of the boiler. The opening of contacts R1c of the relay R1 ensures that a float-warning circuit, including a de-energised holding relay R 3 the contact 18e and a contact R2c of the relay R 2 which at this time are closed, is not established and a warning light 29 is not operated. When the float 20 has dropped to the danger level B, Fig. 1, contacts 22b of the switch 22 are closed to supply energy to an alarm device incorporating an audible unit 27 and a warning lamp 28. When the valve cock 5 reaches the fully drained position Fig. 2 the contact 18c opens so that if there is leakage into the chamber 2 when the valve cock 5 reaches the position in which water is drained from the boiler 1 to flush the drain pipe 10, Fig. 3, the relay R 2 cannot be energised should the contacts 22a be closed by the float rising with the leakage water. The valve cock 5 now commences to rotate in the opposite direction the contact 18e being closed as connection between the branches 6, 7 is re-established and the float 20 rises to close the contacts 22a, re-energise the relay R 1 and stop the alarm device 26 to indicate that the alarm was the result of a monitoring procedure and not due to a fall of the water in the boiler to the danger level shown in Fig. 1. As the valve cock 5 is returned to its original position shown in Fig. 1 the contacts 18d close and the contacts 18a, 18c open. By depressing a manual reset button 30 the boiler attendant can re-energise the relay R 2 the contacts R2c being opened and the contacts R2a, R2b being closed. Assuming, e.g. that due to sludge, the float 20 is unable to fall as the valve cock 5 approaches the position in which the float chamber 2 is connected to the drain 10 the switch contacts 22a remain closed and the relay R 1 remains energised. When the valve cock 5 reaches the position shown in Fig. 2 contacts 18c open to cut off the supply to the relays R 2 , R 1 , the latter initiating shutdown of the oil firing mechanism of the boiler and the former relay closing contacts R2c to complete the float warning circuit through the closed contacts 18e and R1c the contacts R3a of the holding relay R3 also being closed so that the contacts R3a remain held-in after the valve cock 5 has been returned to rest in the position shown in Fig. 1 and the motor 14 has been stopped. When the float failure has been rectified the reset button 30 is depressed to re-energise the relays R 1 , R 2 , R 3 so that the lamp 29 is extinguished and the holding relay R 3 is de-energised the system then being restored to the original condition as shown in Fig. 4 with the oil firing shut-down control inoperative again. If desired the relay R 3 may be provided with a further contact, not shown, which is open when the relay R 3 is energised and which is in series with the press button 30 so that the re-energisation of the relays R 1 , R 2 , R 3 cannot take place even if the press-button has been depressed until the failure of the float to descend has been rectified. The drive unit 16 is preferably connected to the valve cock 5 through a manually operable clutch 19 which is normally spring-loaded into its engaged position and the valve cock 5 is provided with a handle 12 for manual operation. The closing of a press-button 25 commences a monitoring process in addition to that initiated by the time switch. If desired a further contact, not shown, actuated by the camshaft 18 can be arranged to disconnect the alarm device 26 during monitoring and to connect an additional alarm device. Also the time switch 17 may be provided with an extra contact to operate an electric locking device for the clutch 19 to prevent manual disengagement of the clutch, immediately prior to the beginning of a monitoring process. The electric motor may be replaced by a steam or a hydraulic motor the control of the working fluid of which may be effected by an electrical control actuated by the time switch 17. Alternatively the latter may control a mechanical servo-mechanism controlling the working fluid of the motor. The valve cock 5 may be replaced by one or more solenoid operated valves.
GB3336258A 1958-10-20 1958-10-20 A monitoring means for fluid level indicators Expired GB872662A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3336258A GB872662A (en) 1958-10-20 1958-10-20 A monitoring means for fluid level indicators

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3336258A GB872662A (en) 1958-10-20 1958-10-20 A monitoring means for fluid level indicators

Publications (1)

Publication Number Publication Date
GB872662A true GB872662A (en) 1961-07-12

Family

ID=10351934

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3336258A Expired GB872662A (en) 1958-10-20 1958-10-20 A monitoring means for fluid level indicators

Country Status (1)

Country Link
GB (1) GB872662A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106643977A (en) * 2016-11-10 2017-05-10 东北农业大学 Portable semi-automatic water level probe
CN108519133A (en) * 2018-06-12 2018-09-11 昆山大洋电路板有限公司 A kind of addition liquid level suggestion device applied to printed wiring board wet process
CN111599502A (en) * 2020-04-14 2020-08-28 中国核电工程有限公司 Automatic water filling and calibrating device for liquid level switch
US10976074B2 (en) * 2019-06-27 2021-04-13 Xiamen Cheari Eco Technology Co., Ltd Safe water heater

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106643977A (en) * 2016-11-10 2017-05-10 东北农业大学 Portable semi-automatic water level probe
CN108519133A (en) * 2018-06-12 2018-09-11 昆山大洋电路板有限公司 A kind of addition liquid level suggestion device applied to printed wiring board wet process
CN108519133B (en) * 2018-06-12 2023-11-24 昆山大洋电路板有限公司 Add liquid level suggestion device for wet process of printed wiring board
US10976074B2 (en) * 2019-06-27 2021-04-13 Xiamen Cheari Eco Technology Co., Ltd Safe water heater
CN111599502A (en) * 2020-04-14 2020-08-28 中国核电工程有限公司 Automatic water filling and calibrating device for liquid level switch
CN111599502B (en) * 2020-04-14 2023-01-17 中国核电工程有限公司 Automatic water filling and calibrating device for liquid level switch

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