US3791339A - Control mechanisms for steam driven diaphragm valve sound transmitters - Google Patents

Control mechanisms for steam driven diaphragm valve sound transmitters Download PDF

Info

Publication number
US3791339A
US3791339A US00292372A US3791339DA US3791339A US 3791339 A US3791339 A US 3791339A US 00292372 A US00292372 A US 00292372A US 3791339D A US3791339D A US 3791339DA US 3791339 A US3791339 A US 3791339A
Authority
US
United States
Prior art keywords
passage
steam
valve
inlet chamber
diaphragm
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 - Lifetime
Application number
US00292372A
Other languages
English (en)
Inventor
N Dahlquist
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.)
Kockums Mekaniska Verkstads AB
Original Assignee
Kockums Mekaniska Verkstads AB
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 Kockums Mekaniska Verkstads AB filed Critical Kockums Mekaniska Verkstads AB
Application granted granted Critical
Publication of US3791339A publication Critical patent/US3791339A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K7/00—Sirens
    • G10K7/06—Sirens in which the sound-producing member is driven by a fluid, e.g. by a compressed gas

Definitions

  • a control mechanism for a steam driven sound transmitter of the type having a valve diaphragm which during signalling oscillates relative to a seat and periodically opens and closes the communication for the steam between an inlet chamber and an outlet passage opening into a resonance horn but which, when no signal is to be generated, is blocked against the seat by the action of the steam pressure in a back pressure chamber located behind the diaphragm, comprises a valve housing with a cavity, steam passages connecting the inlet chamber and the back pressure chamber with said cavity, a drain passage connecting said cavity with a drainage tank, and a valve-controlled relief passage connecting said cavity with the atmosphere, said passage between the inlet chamber and said cavity having a minimum cross-sectional area which is smaller than the minimum cross-sectional area of the relief passage but greater than the minimum cross-sectional area of the drain passage.
  • a prior art control mechanism for steam driven diaphragm valve sound transmitters of the above mentioned type is described in Swedish Pat. No. 320,611 according to which a valve member movable within the cavity of the valve housing is adapted in signalling position to block the communication between the inlet chamber, the back pressure chamber and the drain passage, but to open the communication between the back pressure chamber and the relief passage and is adapted in non-signalling position to block the relief passage, but to open the communication between the inlet chamber, the back pressure chamber and the drain passage.
  • the valve member is a slide which is axially movable within a bore in the valve housing and which produces the said function by operation between two blocking positions in the valve housing.
  • a disadvantage of this mechanism is its sensitivity to impurities. Thus, it has been found that already small amounts of impurities, such as dust particles, may result in a break-down because the axial movement of the slide is hampered or even prevented.
  • the present invention has for its object to provide a control mechanism for diaphragm valve sound transmitters of the type referred to in the introduction, in which the above-mentioned disadvantage of the prior art control mechanism has been eliminated, thus providing for considerably improved operational reliability, simultaneously as its less complicated construction reduces production costs. Moreover, the present invention aims at providing an improved continuous drainage of the diaphragm valve sound transmitter and at reducing the power requirements of the means for controlling the signalling by means of the sound transmitter.
  • FIG. 1 is a longitudinal section through a diaphragm valve sound transmitter having a control mechanism in accordance with the invention
  • FIG. 2 is a section on line AA in FIG. 1, with the control valve set in blocked position;
  • FIG. 3 is a section on line B-B in FIG. 2.
  • the diaphragm valve sound transmitter illustrated in the drawings comprises a diaphragm housing 1 which consists of a body member 2 and a cover 3 secured thereto.
  • the body member 2 is formed in conventional manner with a hollow mushroom seat 4, the interior of which merges into an outlet passage 5 extending through a resonance horn 6 attached to the body member.
  • a diaphragm 7 is clamped in the diaphragm housing by means of the cover 3, whereby it is held in resilient engagement with the seat 4.
  • the housing has an inlet chamber 8 to which is connected a steam supply line 9.
  • the inside of the cover 3 defines together with the diaphragm 7 a space 10 which usually is termed back pressure chamber.
  • the back pressure chamber 10 communicates with the inlet chamber 8 through passages 11 (FIG.
  • the operating valve 13 comprises a valve housing 14 which is mounted at the lower edge of the cover 3 by means of screws.
  • the cavity within the valve housing is constituted by an axial bore 15 which at its left-hand end (in FIG. 1) is closed by means of a threaded plug 18.
  • the bore 15 is in communication with the inlet chamber 8 through a passage 19 formed in the valve housing 14 and through the passages 12 formed in the diaphragm housing.
  • a radial drain passage 21 is provided in the lower part of the valve housing 14 and extends from the bore 15 through the housing.
  • the drain passage 21 is connected by means of a pipeline 22 to a drainage tank (not shown) which may be the feed-water tank of the steam generator.
  • the drain passage 21 has a minimum cross-sectional area that is smaller than the smallest cross-sectional area of the passages 19 and 12 between the inlet chamber and the bore 15.
  • a passage 23 connects the back pressure chamber 10 to the bore 15, whereby the previously mentioned communication between the back pressure chamber 10 and the inlet chamber 8 is established.
  • the bore 15 opens into a turned cavity at the other end of the valve housing 14, said cavity having a diameter larger than that of the bore 15 and accommodating a guide 24 screwed thereinto.
  • An operating rod 25 is axially movable within said guide 24 which, together with said operating rod 25 and associated details, constitutes a transfer mechanism for transferring the operating movement from a preferably electromagnetical operating member 29 for operating the signalling by means of the sound transmitter.
  • An annular seat 26 of an elastic material resistant to steam is fixed between the inner end of the guide 24 and the bottom of the turned cavity. The opening in the seat 26 forms, together with a passage 27 within the guide and a passage 28 within the diaphragm housing, a relief passage communicating with the atmosphere.
  • the minimum cross-sectional area of the relief passage thus formed is to be greater than the minimum cross-sectional area of the passage 19, 12 between the inlet chamber and the bore 15.
  • the relief passage is closed by means of a valve mechanism which in the illustrated embodiment is constituted by a ball 20, preferably of stainless steel.
  • the ball 20 is provided within the bore 15 for sealing against the annular seat 26 against which it is held by a spring 17.
  • the operating rod 25 extends up to the seat 26 with the rod end in immediate proximity to the ball 20.
  • the operating rod 25 projects in the opposite direction some distance beyond the guide for axial actuation of the operating member 29.
  • the sound transmitter as well as the operating means and the pipe connections are mounted in a common frame generally designated 30 in FIG. 2.
  • the control mechanism functions in the following manner:
  • the movable parts of the control mechanism In blocking position, that is when no signal is to be generated, the movable parts of the control mechanism occupy the position shown in FIG. 2.
  • the ball 20 is thereby urged into sealing engagement with the seat 26, the communication of the relief passage with the atmosphere being interrupted.
  • the inlet chamber 8, the back pressure chamber and the drain passage 21 are in communication with each other through the passages 12 formed in the diaphragm housing, the passage 19 and the bore 15 in the valve housing, as well as the passage 23 in the valve housing and the passage 11 in the diaphragm housing.
  • the same steam pressure will thus prevail in the inlet chamber 8 and in the back pressure chamber 10, causing the diaphragm 7 to be urged towards the seat 4 for sealing engagement therewith.
  • the diaphragm housing is kept heated because the inlet chamber 8 and the back pressure chamber 10 in the diaphragm housing are completely filled with steam, also when no signal is generated.
  • the condensation water forming within the inlet chamber 8 and in the back pressure chamber 10 escapes continuously through the passages 12, 19 and 11, 23, the bore 15 and the drain passage 21 to the drainage tank.
  • the pressure prevailing in the drainage tank corresponds to the ambient pressure, also a given amount of steam will escape continuously from the inlet chamber 8 through the passages 11 and 19.
  • the drain passage 21 has a minimum cross-sectional area that is smaller than the crosssectional area of the communication passages 11, 19 between the inlet chamber 8 and the bore 15, the back pressure in the back pressure chamber will be built up and maintained.
  • the operating member 29 When a signal is to be generated, the operating member 29 is enabled so that it urges the operating rod 25 towards the seat 26. The ball is then moved away from the seat, whereby communication is established with the atmosphere through the relief passage which comprises the opening of the seat 26 and the passages 27 and 28. The steam pressure in the back pressure chamber is then relieved in that the steam escapes through the relief passage to atmosphere. Due to the resulting pressure difference between the inlet chamber and the back pressure chamber, the diaphragm 7 is caused to leave the seat 4', whereby signalling is initiated in conventional manner.
  • the minimum cross-sectional area of the relief passage is greater than the minimum cross-sectional area of the passages 12 and 19 between the inlet chamber 8 and the bore 15, rapid relief of the pressure in the back pressure chamber 10 is possible, despite a certain leakage of steam from the inlet chamber to the bore 15.
  • the expression minimum cross-sectional area" in connection with different passages in the control mechanism naturally implies the minimum effective cross-sectional area which, for instance in connection with the relief passage, can imply the minimum cross-sectional area of the seat opening 26 minus the cross-sectional area of the operating rod 25 actuating the ball 20.
  • the relief passage is in direct communication with the atmosphere, but it will be obvious that a back pressure regulator of the type described in Swedish Pat. No.
  • 320,61 1 can be connected to the relief pas sage.
  • trails made with a control mechanism according to the present invention have shown that it is possible to omit the back pressure regulator and to let the relief passage open directly to the ambient atmosphere.
  • the drain passage was connected to the drainage tank via a condensation water separator. This necessitated blocking the inlet chamber, the back pressure chamber and the drain passage from one another to avoid the risk of any condensation water in the drain passage being sucked back into the inlet chamber where a certain pressure reduction is obtained during signalling.
  • the drain passage has been connected directly to the drainage tank in which atmospheric pressure prevails.
  • a control mechanism for steam driven diaphragm sound transmitters having a diaphragm which during signaling oscillates relative to a seat and periodically opens and closes the communication for the steam between an inlet chamber and an outlet passage opening into a resonant horn but which, when no signal is to be generated, is blocked against the seat by the action of the pressure of the steam in a back pressure chamber located behind the diaphragm, the inlet chamber and the back pressure chamber being connected via passages in a valve housing to a cavity formed in said valve housing and communicating via a drain passage with a drainage tank and via a valve-controlled relief passage with the atmosphere, wherein the improvement com prises the passage between the inlet chamber and the valve-controlled relief passage comprises an annular passage communicating with a relief passage open to the atmosphere and a' valve mechanism which closes said annular passage to escape of steam to the atmosphere through said annular passage.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Fluid-Driven Valves (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
  • Details Of Valves (AREA)
US00292372A 1971-09-27 1972-09-26 Control mechanisms for steam driven diaphragm valve sound transmitters Expired - Lifetime US3791339A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE12168/71A SE348578B (enrdf_load_stackoverflow) 1971-09-27 1971-09-27

Publications (1)

Publication Number Publication Date
US3791339A true US3791339A (en) 1974-02-12

Family

ID=20295271

Family Applications (1)

Application Number Title Priority Date Filing Date
US00292372A Expired - Lifetime US3791339A (en) 1971-09-27 1972-09-26 Control mechanisms for steam driven diaphragm valve sound transmitters

Country Status (8)

Country Link
US (1) US3791339A (enrdf_load_stackoverflow)
JP (1) JPS5237916B2 (enrdf_load_stackoverflow)
DE (1) DE2244135B2 (enrdf_load_stackoverflow)
DK (1) DK128962B (enrdf_load_stackoverflow)
GB (1) GB1400812A (enrdf_load_stackoverflow)
NO (1) NO127030B (enrdf_load_stackoverflow)
PL (1) PL79467B1 (enrdf_load_stackoverflow)
SE (1) SE348578B (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3942468A (en) * 1973-09-24 1976-03-09 Kockums Mekaniska Verkstads Aktiebolag Back pressure operated sound transmitter

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52157588U (enrdf_load_stackoverflow) * 1976-05-25 1977-11-30

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3581705A (en) * 1969-01-09 1971-06-01 Kockums Mekaniska Verkstads Ab Diaphragm valve sound transmitters operating on gaseous pressure medium

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3581705A (en) * 1969-01-09 1971-06-01 Kockums Mekaniska Verkstads Ab Diaphragm valve sound transmitters operating on gaseous pressure medium

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3942468A (en) * 1973-09-24 1976-03-09 Kockums Mekaniska Verkstads Aktiebolag Back pressure operated sound transmitter

Also Published As

Publication number Publication date
SE348578B (enrdf_load_stackoverflow) 1972-09-04
JPS4843314A (enrdf_load_stackoverflow) 1973-06-22
PL79467B1 (enrdf_load_stackoverflow) 1975-06-30
DK128962B (da) 1974-07-29
DE2244135A1 (de) 1973-04-05
JPS5237916B2 (enrdf_load_stackoverflow) 1977-09-26
GB1400812A (en) 1975-07-23
DE2244135B2 (de) 1976-05-26
NO127030B (enrdf_load_stackoverflow) 1973-04-24

Similar Documents

Publication Publication Date Title
EP0148480A3 (en) Valve opened by vacuum
GB1074594A (en) Improvements in or relating to reciprocating liquid dispensing pumps
ES441716A1 (es) Perfeccionamientos en valvulas de regulacion de flujo de fluido.
US3791339A (en) Control mechanisms for steam driven diaphragm valve sound transmitters
ATE166701T1 (de) Brennstoffeinspritzventil
ATE205923T1 (de) Ventilkammerwand mit satellitenventilsitz
CA2483179C (en) Fuel return valve
GB1235256A (en) Sound damper for conduits conveying water under pressure
US1746034A (en) Sound producer
US3824033A (en) Hydraulic turbine nozzle
ES344298A1 (es) Un casquillo de guia mejorado destinado a utilizarse con una valvula de regulacion.
GB1188508A (en) Improvements in or relating to Rapid Air Relief Valves
DE59703087D1 (de) Druckregelventil
KR830005524A (ko) 온냉수 혼합용 수도꼭지
JPS5746040A (en) Air intake control unit for diesel engine
DE3781779D1 (en) Diaphragm brake cylinder for motor vehicle
ES429733A1 (es) Perfeccionamientos introducidos en valvulas.
GB1090180A (en) Improvements in or relating to pneumatic time delay devices
JPS5737159A (en) Water valve with auxiliary valve
SU985413A1 (ru) Защитное устройство вакуумной системы
GB1128246A (en) Improvements in or relating to water-spray laundry irons
US1499637A (en) Attachment for locomotives
SU888709A1 (ru) Пневматический источник сейсмических сигналов
US2031120A (en) Stoker controlling device
SU420840A1 (ru) ПРЕДОХРАНИТЕЛЬНЫЙ КЛАНАМ•"• П; р1 f'f-n; ч-0,^4 - ••