CN102759384B - Gas roots type flow meter - Google Patents
Gas roots type flow meter Download PDFInfo
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- CN102759384B CN102759384B CN201210203309.1A CN201210203309A CN102759384B CN 102759384 B CN102759384 B CN 102759384B CN 201210203309 A CN201210203309 A CN 201210203309A CN 102759384 B CN102759384 B CN 102759384B
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Abstract
The invention relates to a gas roots type flow meter with functions of alarm and bypass. The flow meter comprises a differential pressure base, a signal trigger mechanism and a flow meter body, wherein two ends of a cut-through channel are respectively provided with a waist wheel, the differential pressure base is communicated with an air inlet end through a conduit, the differential pressure base is internally provided with an elastic leather membrane, the differential pressure base is connected with a universal driving shaft fixed with the leather membrane, the universal driving shaft is hinged with an elastic pinch plate of which one end is provided with a hook angle, the cut-through channel is internally provided with a valve seat, a valve rod is arranged on the valve seat, a restoring spring is connected between the valve rod and the valve seat, a valve clack is fixedly arranged on the valve rod, the valve clack is connected with a hook angle of the elastic pinch plate in a clamping way, the signal trigger mechanism comprises a magnetic steel support column, and the magnetic steel support column leans against one end of the valve rod which is far away from the valve clack. The gas roots type flow meter has the benefit effects that 1. after the flow meter has fault, a bypass device starts, and gas directly passes through the cut-through channel, so that the gas supply of upstream gas equipment can be guaranteed within a short time; and 2. the valve rod is separated from the magnetic steel support column, so that the signal trigger mechanism transmits a signal so as to promote workers to maintain the flow meter.
Description
Technical field
The present invention relates to a kind of flow instrument, especially relate to a kind of gas Roots flow meter with warning and bypass function.
Background technology
Gas Roots flow meter is a kind of volumetric flow metering instrument of accurate measurement gas flow, there is the features such as precision is high, good reliability, lightweight, the life-span is long, running noises is low, be suitable for measuring the noncorrosive gases such as rock gas, town gas, propane, nitrogen, industrial inertia gas, be widely used in the combustion gas business clearing of the industry such as food and drink, hotel, transmission and distribution network gas metering, gas pressure regulating station metering, the gas meterings such as industry and civil boiler.
The principle of work of gas Roots flow meter is as follows: in the time that gas passes through flowmeter, produce pressure reduction at inlet end and outlet side, act on the two waist wheels that are linked together with high-accuracy synchromesh gear, thereby drive the rotation of two waist wheel, between two waist wheels and flowmeter shell inwall and gland, form confined space during this period, periodically inflate and exhaust, the revolution of two waist wheels is directly proportional to the gas volume amount by flowmeter, the rotation of two waist wheels passes to mechanical counter through magnetic coupler, thereby accumulative total is flowed through, the volume of measurement chamber is to realize the object of metering.
In the normal use procedure of gas Roots flow meter, waist wheel runs well, and the gas loss amount between Roots type flowmeter entrance end is very little, and gas flows directly into downstream user with pipeline.But when waist wheel Rig up error or because booty is when stuck, gas can not smooth and easyly be discharged through outlet side, it is large that pressure reduction between Roots type flowmeter entrance end becomes, gas condenses upon the inlet end of gas Roots flow meter gradually, as processed not in time, the just conventional gas of flowmeter downstream gas-fired equipment can be affected, and Causing Flowmeter Damages can be caused.
A kind of flowmeter is now provided, as notification number is: a kind of point contacting alarming float meter that the Chinese utility model patent of CN87212150U provides, be applicable to the flow measurement of non-conductive solution and gas, it endpiece above tapered tube and below entrance point and the corresponding a certain scale of alarm setting value place, be provided with at least one group of electric contact, when flow reaches and exceeds upper limit alarming value, when lower than the next limit alarming value, float contacts with electric contact, by logical warning circuit, sends alerting signal.The float of this patent contacts with electric contact under gas pressure, and realize and reporting to the police, and under gas pressure, it is many that float is disturbed factor, movable poor stability, reliable not, easily there is the problem that false alarm even can not be reported to the police.
Summary of the invention
The present invention is mainly for the not accurate enough problem of the existing alarm decision of existing alarm flowmeter, and the gas Roots flow meter that a kind of accuracy of reporting to the police is high, obstruction gas can be discharged from bypass is provided.
Above-mentioned technical matters of the present invention is mainly solved by following technical proposals: a kind of gas Roots flow meter, comprise flowmeter bodies, flowmeter bodies is provided with the put-through channel can supplied gas passing through, the two ends of put-through channel are provided with waist wheel, also comprise the pressure reduction seat and the signal trigger mechanism that are arranged in flowmeter bodies, pressure reduction seat is communicated with the inlet end of put-through channel by conduit, in pressure reduction seat, be provided with the elasticity epithelium that forms seal point, on pressure reduction seat, be connected with movably universal driving shaft, universal driving shaft is fixedly connected with epithelium, on universal driving shaft, be hinged with the elastic force buckle of one end band cheicers, in put-through channel, be provided with valve seat, valve seat is provided with the valve rod that can move along put-through channel, between valve rod and valve seat, be connected with back-moving spring, on valve rod, be installed with flap, the cheicers clamping of flap and elastic force buckle, signal trigger mechanism comprises movably magnet steel pillar, magnet steel pillar is resisted against one end away from flap on valve rod.In the time that gas Roots flow meter normally uses, magnet steel pillar is held in valve rod one end, and signal trigger mechanism can not react, when waist wheel Rig up error or because booty is when stuck, the gaseous tension of inlet end increases, gas can enter pressure reduction seat along conduit, and the epithelium in pressure reduction seat is produced to downforce, in the time that downforce is greater than the elastic deformation force of epithelium itself, epithelium middle part will move downward, and drive universal driving shaft together to decline, the activity of elastic force buckle, flap separates with elastic force buckle, valve rod moves under the acting force of back-moving spring, magnet steel pillar separates and moves down with valve rod, signal trigger mechanism reacts thereupon, signal trigger mechanism transmits to remote control terminal, remind this gas Roots flow meter of operating personnel to break down, notice gas company safeguards flowmeter in time.Valve seat, flap, valve rod and back-moving spring are by-pass collar of the present invention, by-pass collar is opened, be that flap moves to put-through channel outlet side, between flap and put-through channel, form less gas passage, gas can be discharged by this passage, in short time, guarantee the air feed demand of downstream gas-fired equipment, this time period can remove to safeguard gas Roots flow meter for operating personnel.
As preferably, described signal trigger mechanism comprises sensor holder, in sensor holder, be provided with tongue tube, the bottom of sensor holder is provided with screwed union, being axially arranged with of screwed union extends to the pillar hole of tongue tube below, described magnet steel pillar is positioned at pillar hole and is slidably connected with screwed union, the upper end of magnet steel pillar is provided with magnet, on tongue tube, be connected with magnetosensitive signal wire, magnetosensitive signal wire is connected with remote control terminal by radio, the bottom cover of magnet steel pillar has overcoat, bottom one side of overcoat to be provided with the valve rod hole that can pass for valve rod.Be set on outward in the pipeline that flowmeter shell mates with overcoat, sensor holder is positioned at the top of pipeline, and valve rod can move under flap effect.In the time there is unusual condition in flowmeter, flap separates with elastic force buckle, valve rod exits overcoat under the acting force of back-moving spring, magnet steel pillar does the movement of falling object in overcoat, the magnet of magnet steel pillar top is away from tongue tube, two reeds in tongue tube due to magnet away from becoming separated position from closure state, the variation of reed state transmits to remote control terminal magnetosensitive signal wire, remote control terminal receives signal and learns that unusual condition appears in flowmeter, so far completes alarm procedure.
As preferably, described sensor holder surface is provided with oil fill plug, and the upper port place cover of overcoat has hold-down ring, between tongue tube and magnetosensitive signal wire and sensor holder, is provided with adhesive layer.Oil fill plug is transparence, and operating personnel can observe magnet steel pillar in sensor holder and the situation of magnet by oil fill plug; Hold-down ring makes outer being enclosed within installation process, and the valve rod hole of overcoat is aimed at after valve rod, and hold-down ring is fixed by screw thread and overcoat, and overcoat and flowmeter pipeline inwall are fixed; Adhesive layer has improved sealing, makes the position of magnetosensitive signal wire comparatively fixing simultaneously.
As preferably, described pressure reduction seat comprises epithelium upper cover and epithelium lower cover, is covered with and the sealing ring of epithelium lower cover butt on epithelium, and epithelium edge, between sealing ring and epithelium lower cover, is embedded with O-ring seal between sealing ring side and epithelium lower cover.On epithelium, be covered with after the sealing ring with epithelium lower cover butt, the contact area of epithelium upper cover and epithelium lower cover increases, and the sealing property between epithelium upper cover and epithelium lower cover improves, and epithelium more easily makes pressure reduction seat upper-lower seal, and gas is difficult for revealing; O-ring seal has further improved the sealing between epithelium upper cover and epithelium lower cover.
As preferably, on universal driving shaft, be bolted with two nuts, between two nuts, be provided with top board and lower platen, lower platen middle part is provided with boss, top board is provided with the groove with boss adaptation, top board and lower platen clamping, epithelium be socketed on boss and epithelium between top board and lower platen.Top board, epithelium and lower platen are fixed together, and have strengthened epithelium anti-pressure ability, increase the service life, and the fixing safety of epithelium and universal driving shaft is firm in addition; Top board and lower platen are connected together, and accurate positioning is reliable, are difficult for becoming flexible, and epithelium is safe and reliable.
As preferably, it is prominent that the outer edge of described epithelium extends to form location downwards, under epithelium, cover to be provided with to hold the prominent locating slot in location, and the epithelium middle part formation annular compression ring that raises up, pressure ring is between dashing forward in top board and location.Prominent the inserting in locating slot in location on epithelium, epithelium fixation, be difficult for throwing off, and sealing property improves; Pressure ring raises up, and the protrusion direction pressure direction downward with air-flow is contrary, and epithelium more easily under the effect of stream pressure, elastic deformation occurs, and reaction sensitivity is high.
As preferably, described epithelium upper cover is fixedly connected with epithelium lower cover by set bolt, is installed with below epithelium upper cover and places restrictions on piece, places restrictions on piece and aims at top board.Epithelium upper cover is fixed by bolt and epithelium lower cover, technology maturation, fixation; After epithelium middle part moves downward, in the time that epithelium top air pressure reduces or disappears, epithelium rebounds under the effect of self elastic force, and epithelium middle part moves upward, if bounce-back amount of exercise is excessive, epithelium easily collides epithelium upper cover, epithelium easily damages, and places restrictions on piece and aims at top board therefore cover to arrange on epithelium, places restrictions on piece and first touches top board, for slowing down the reaction force of epithelium, extend its serviceable life.
As preferably, valve seat bottom is provided with and can holds the pilot hole that valve rod passes, and valve rod and valve seat are slidably connected, and back-moving spring is set on valve rod, and butt, the other end and flap butt bottom one end of back-moving spring and valve seat.Valve seat is fixed in the put-through channel of flowmeter, and valve rod is through pilot hole valve seat slip relatively, and when after flap and the disconnection of elastic force buckle, valve rod can move under the effect of back-moving spring.
As preferably, between described pressure reduction seat and conduit, be provided with T-valve, a valve port of T-valve is connected with conduit, a valve port is connected with pressure reduction seat, remain a valve port and be provided with large footpath section, the junction of large footpath section and valve port is provided with sealed steel ball, in the section of large footpath, is also provided with Compress Spring, one end of Compress Spring and steel ball against, the other end is connected in the section external port of large footpath.After flowmeter inlet end stops up, gas enters T-valve from conduit, then enters in pressure reduction seat, and epithelium is produced to pressure, large footpath section on another one valve port is larger than the bore of this valve port self, when gas fully enters pressure reduction seat, when epithelium middle part moves downward to extreme position, air pressure continues increase will cause epithelium breakage, therefore be provided with Compress Spring and steel ball in the section of large footpath, too much assemble gas push steel ball and move, gas can be discharged by large footpath section, avoids gas Roots flow meter to damage.
Therefore, the invention has the beneficial effects as follows: 1, in the time that flowmeter breaks down, by the by-pass collar of opening, gas directly flows through flowmeter bodies put-through channel, the air feed that guarantees downstream gas-fired equipment in short time, provides the time for operating personnel safeguard gas Roots flow meter; 2, after Roots type flowmeter breaks down, gas enters pressure reduction seat and makes the motion of epithelium middle part, finally makes valve rod separate with magnet steel pillar, and signal trigger mechanism sends to report to the police informs associative operation personnel, to keep in repair, report to the police accurately, and good stability; 3, between pressure reduction seat and conduit, be provided with T-valve, the gas of too much assembling can be discharged by T-valve, avoids gas Roots flow meter to damage.
Accompanying drawing explanation
Accompanying drawing 1 is a kind of perspective view of the present invention;
Accompanying drawing 2 is a kind of schematic diagram under normal operating condition of the present invention;
Accompanying drawing 3 is after the present invention breaks down, a kind of schematic diagram of alarm activation;
Accompanying drawing 5 is the partial sectional views at B place in accompanying drawing 2;
Accompanying drawing 6 is the partial sectional views at C place in accompanying drawing 3.
Shown in figure: 1-flowmeter bodies, 2-put-through channel, 3-pressure reduction seat, 4-signal trigger mechanism, 5-conduit, 6-epithelium, 7-universal driving shaft, 8-elastic force buckle, 9-valve seat, 10-valve rod, 11-back-moving spring, 12-flap, 13-magnet steel pillar, 14-sensor holder, 15-tongue tube, 16-screwed union, 17-magnet, 18-magnetosensitive signal wire, 19-overcoat, 20-pillar hole, 21-oil fill plug, 22-sealing ring, 23-top board, 24-lower platen, 25-location is prominent, 26-pressure ring, 27-places restrictions on piece, 28-T-valve, 29-steel ball, 30-Compress Spring, 31-pilot hole, 32-epithelium upper cover, 33-epithelium lower cover, 34-hold-down ring, 35-compression fittings.
Embodiment
Below by embodiment, and by reference to the accompanying drawings, technical scheme of the present invention is described in further detail.
Embodiment:
As shown in Figure of description 1, a kind of gas Roots flow meter, comprise flowmeter bodies 1 and be arranged on the pressure reduction seat 3 on flow element body 1, signal trigger mechanism 4, flowmeter bodies 1 is provided with the put-through channel 2 can supplied gas passing through, the two ends of put-through channel 2 are provided with two waist wheels, the upper end of pressure reduction seat 3 is bolted with the compression fittings 35 of connection, as shown in Figure of description 6, the top of compression fittings 35 is provided with T-valve 28, compression fittings 35 is fixed by nut with a valve port of T-valve 28, another valve port of T-valve 28 is connected with conduit 5, conduit 5 extends to the air inlet port of put-through channel 2, conduit 5 is fixed by nut with the valve port of corresponding T-valve 28, the remaining valve port of T-valve 28 is provided with large footpath section, the junction of large footpath section and valve port is provided with sealed steel ball 29, in the section of large footpath, be also provided with Compress Spring 30, one end of Compress Spring 30 and steel ball 29 against, the other end is connected in the section external port of large footpath, as shown in Figure of description 4, pressure reduction seat 3 comprises epithelium upper cover 32, epithelium lower cover 33, top board 23 and lower platen 24, in pressure reduction seat 3, be provided with epithelium 6 and universal driving shaft 7, epithelium upper cover 32, epithelium lower cover 33, epithelium 6, top board 23 and lower platen 24 are discoid, epithelium 6 adopts nylon to strengthen cloth and makes, the outer edge of epithelium 6 extends to form location prominent 25 downwards, epithelium 6 raises up and forms pressure ring 26, pressure ring 26 is positioned at the side near location prominent 25 on epithelium 6, pressure ring 26 encloses around epithelium 6 circumference one, epithelium upper cover 32 is provided with four bolt connecting holes, four bolt connecting holes are evenly laid in epithelium upper cover 32 surroundings, epithelium upper cover 32 is fixedly connected with epithelium lower cover 33 by set bolt, epithelium upper cover 32 lower end one are fixedly connected with sealing ring 22, epithelium lower cover 33 upper ends are provided with the open slot with sealing ring 22 adaptations, on open slot, offer the locating slot that can hold location prominent 25, location prominent 25 is placed in locating slot, the sealing ring 22 of epithelium upper cover 32 compresses with the open slot of epithelium lower cover 33, between sealing ring 22 sides and epithelium lower cover 33, be embedded with rubber seal, between epithelium upper cover 32 and epithelium lower cover 33, be linked to be cavity, epithelium 6 is arranged in cavity and epithelium 6 makes cavity upper-lower seal, the upper end of universal driving shaft 7 is the little axle head that is covered with screw thread, on little axle head, be bolted with two nuts, top board 23 and lower platen 24 lay respectively at the upper and lower surface of epithelium 6 and epithelium 6 respectively with top board 23 and lower platen 24 butts, top board 23 and lower platen 24 are between two nuts, lower platen 24 middle parts are provided with boss, the middle part of epithelium 6 is provided with aperture, epithelium 6 is socketed on boss by aperture, top board 23 is provided with the groove with boss adaptation, lower platen 24 is 0.4 times of epithelium 6 radiuses to the distance of epithelium lower cover 33, top board 23 and lower platen 24 clampings, pressure ring 26 is between location prominent 25 and top board 23, the central upper portion position of epithelium upper cover 32 is provided with bolt apertures, epithelium upper cover 32 is connected with compression fittings 35 by bolt apertures, the lower surface of epithelium upper cover 32 is installed with four boss-shapeds and places restrictions on piece 27, placing restrictions on piece 27 for four is evenly laid in bolt apertures surrounding and aims at top board 23, epithelium lower cover 33 bottoms are provided with epithelium holder, the bottom of epithelium holder is provided with screw thread, epithelium holder and flowmeter bodies 1 are fixing, universal driving shaft 7 connects epithelium lower cover 33 and epithelium holder and is slidably connected with the two, the bottom of universal driving shaft 7 extends to the outlet side of flowmeter bodies 1, the bottom of universal driving shaft 7 is hinged with elastic force buckle 8, one end relative with universal driving shaft 7 on elastic force buckle 8 is integrally formed with cheicers, in put-through channel 2, be installed with valve seat 9, valve seat 9 bottoms are provided with pilot hole 31, valve seat 9 is provided with valve rod 10, valve rod 10 passes pilot hole 31 and is slidably connected with valve seat 9, one end of valve rod 10 is provided with flap 12, flap 12 is closely connected with valve rod 10, on valve rod 10, be arranged with back-moving spring 11, one end of back-moving spring 11 and valve seat 9 bottom butts, the other end and flap 12 butts, the cheicers clamping of flap 12 and elastic force buckle 8, as shown in Figure of description 5, signal trigger mechanism 4 signal trigger mechanisms 4 comprise sensor holder 14, the bottom of sensor holder 14 is provided with screwed union 16, screwed union 16 be axially arranged with the pillar hole 20 that extends to tongue tube 15 belows, in sensor holder 14, be provided with tongue tube 15, on tongue tube 15, be connected with magnetosensitive signal wire 18, magnetosensitive signal wire 18 parts are positioned at sensor holder 14, outside part position and sensor holder 14, magnetosensitive signal wire 18 is connected with remote control terminal by radio, between the entirety that tongue tube 15 and magnetosensitive signal wire 18 form and sensor holder 14, be provided with adhesive layer, sensor holder 14 surfaces are provided with oil fill plug 21, in pillar hole 20, be inserted with the magnet steel pillar 13 that can slide along pillar hole 20, magnet steel pillar 13 inner and upper are provided with magnet 17 near tongue tube 15 places, magnet 17 parts are in magnet steel pillar 13, another part is outside magnet steel pillar 13, the bottom of magnet steel pillar 13 is provided with overcoat 19, the degree of depth of overcoat 19 is greater than magnet steel pillar 13, bottom one side of overcoat 19 is provided with a valve rod hole, valve rod 10 is through valve rod hole, magnet steel pillar 13 is withstood in valve rod 10 one end in overcoat 19, magnet steel pillar 13 is positioned at the top of valve rod 10, the upper port place cover of overcoat 19 has hold-down ring 34.
The inlet end of gas Roots flow meter and outlet side produce pressure reduction, act on the two waist wheels that are linked together with high-accuracy synchromesh gear upper, thereby drive the rotation of two waist wheel.In the time that gas Roots flow meter is normally worked, as shown in Figure of description 2, gas enters flowmeter bodies from inlet end, again by the rotation Exhaust Gas of two waist wheels, for the just conventional gas of downstream gas-fired equipment, now epithelium can not deform, remain on initial position, universal driving shaft is positioned at initial position, elastic force buckle is by cheicers and flap clamping, and back-moving spring is in compressive state, and valve rod is held magnet steel pillar through valve rod hole, two reeds in tongue tube are in closure state under the absorption affinity of magnet, and signal trigger mechanism can not react.When waist wheel Rig up error or because booty is when stuck, as shown in Figure of description 3, two waist wheels are stuck, gas can not be discharged by two waist wheels, the gas of air inlet port is assembled gradually, the gas of air inlet port enters T-valve by conduit, enter again in the cavity of pressure reduction seat, along with air pressure increases gradually, epithelium in cavity is produced to downforce, in the time that pressure is greater than the elastic deformation force of epithelium itself, epithelium middle part will move downward, and drive universal driving shaft together to decline, the elastic force buckle activity hinged with universal driving shaft, elastic force buckle separates with flap, valve rod and flap move to outlet side direction under the restoring force of back-moving spring, valve rod exits overcoat, valve rod can not support magnet steel pillar more thereupon, magnet steel pillar drives the magnet of magnet steel post top portion together to decline under self gravitation effect, the magnet of magnet steel pillar top is away from tongue tube, two reeds in tongue tube due to magnet away from becoming separated position from closure state, the variation of reed state transmits to remote control terminal magnetosensitive signal wire, remote control terminal receives signal and learns that unusual condition appears in flowmeter, remind this gas Roots flow meter of operating personnel to break down, notice gas company safeguards flowmeter in time, after by-pass collar is opened simultaneously, be that flap moves to put-through channel outlet side, between flap and put-through channel, form less gas passage, gas can be discharged by this passage, in short time, guarantee the air feed demand of downstream gas-fired equipment, this time period can remove to safeguard gas Roots flow meter for operating personnel.
If this gas Roots flow meter fails to safeguard in time, too much when the air accumulation of air inlet port, as shown in Figure of description 6, too much gas will promote steel ball and retract, and can discharge by the space between steel ball and large footpath section, this structure has been avoided gas Roots flow meter damage.
After safeguarding, this gas Roots flow meter also can normally work, the pressure reduction of entrance end reduces gradually, the pressure on epithelium top reduces, in the time that this gas downforce is less than the elastic deformation force of epithelium self, the upwards bounce-back under the effect of self elastic force of epithelium middle part, top board with on move, top board touches places restrictions on piece, play position-limiting action, prevent that epithelium from excessively moving upward, the epithelium causing damages.
In summary it can be seen, the present invention accurately reports to the police, remind staff to safeguard flowmeter, guarantee the just conventional gas of downstream gas-fired equipment, too much gas can be discharged by the valve port of T-valve again, prevent that gas Roots flow meter from damaging under strong gas pressure, extended its serviceable life, it is little on user's impact that this gas Roots flow meter has reliable operation, Pulsating Flow interference is little, metering is accurate, break down in scene, reduces combustion gas and carry the features such as trade measurement shoutage.
Should be understood that this embodiment is only not used in and limits the scope of the invention for the present invention is described.In addition should be understood that those skilled in the art can make various changes or modifications the present invention after having read the content of the present invention's instruction, these equivalent form of values fall within the application's appended claims limited range equally.
Claims (8)
1. a gas Roots flow meter, comprise flowmeter bodies (1), flowmeter bodies (1) is provided with the put-through channel (2) can supplied gas passing through, the two ends of put-through channel (2) are provided with waist wheel, it is characterized in that, also comprise the pressure reduction seat (3) and the signal trigger mechanism (4) that are arranged in flowmeter bodies (1), pressure reduction seat (3) is communicated with the inlet end of put-through channel (2) by conduit (5), in pressure reduction seat (3), be provided with the elasticity epithelium (6) that forms seal point, on pressure reduction seat (3), be connected with movably universal driving shaft (7), universal driving shaft (7) is fixedly connected with epithelium (6), on universal driving shaft (7), be hinged with the elastic force buckle (8) of one end band cheicers, in put-through channel (2), be provided with valve seat (9), valve seat (9) is provided with can be along the mobile valve rod (10) of put-through channel (2), between valve rod (10) and valve seat (9), be connected with back-moving spring (11), on valve rod (10), be installed with flap (12), the cheicers clamping of flap (12) and elastic force buckle (8), signal trigger mechanism (4) comprises movably magnet steel pillar (13), magnet steel pillar (13) is resisted against the upper one end away from flap (12) of valve rod (10), described signal trigger mechanism (4) comprises sensor holder (14), in sensor holder (14), be provided with tongue tube (15), the bottom of sensor holder (14) is provided with screwed union (16), being axially arranged with of screwed union (16) extends to the pillar hole (20) of tongue tube (15) below, described magnet steel pillar (13) is positioned at pillar hole (20) and is slidably connected with screwed union (16), the upper end of magnet steel pillar (13) is provided with magnet (17), on tongue tube (15), be connected with magnetosensitive signal wire (18), magnetosensitive signal wire (18) is connected with remote control terminal by radio, the bottom cover of magnet steel pillar (13) has overcoat (19), bottom one side of overcoat (19) is provided with valve rod (10) hole that can supply valve rod (10) to pass.
2. a kind of gas Roots flow meter according to claim 1, it is characterized in that, described sensor holder (14) surface is provided with oil fill plug (21), the upper port place cover of overcoat (19) has hold-down ring (34), between tongue tube (15) and magnetosensitive signal wire (18) and sensor holder (14), is provided with adhesive layer.
3. a kind of gas Roots flow meter according to claim 2, it is characterized in that, described pressure reduction seat (3) comprises epithelium upper cover (32) and epithelium lower cover (33), epithelium upper cover (32) is provided with the sealing ring (22) with epithelium lower cover (33) butt, epithelium (6) edge is positioned between sealing ring (22) and epithelium lower cover (33), between sealing ring (22) side and epithelium lower cover (33), is embedded with O-ring seal.
4. a kind of gas Roots flow meter according to claim 3, it is characterized in that, on universal driving shaft (7), be bolted with two clamp nuts, between two clamp nuts, be provided with top board (23) and lower platen (24), lower platen (24) middle part is provided with boss, top board (23) is provided with the groove with boss adaptation, top board (23) and lower platen (24) clamping, and epithelium (6) is socketed on boss and epithelium (6) is positioned between top board (23) and lower platen (24).
5. a kind of gas Roots flow meter according to claim 4, it is characterized in that, the outer edge of described epithelium (6) extends to form location prominent (25) downwards, epithelium lower cover (33) is provided with the locating slot that can hold location prominent (25), epithelium (6) middle part raises up and forms annular compression ring (26), and pressure ring (26) is positioned between top board (23) and location prominent (25).
6. a kind of gas Roots flow meter according to claim 5, it is characterized in that, described epithelium upper cover (32) is fixedly connected with epithelium lower cover (33) by set bolt, and epithelium upper cover (32) is installed with below places restrictions on piece (27), places restrictions on piece (27) and aims at top board (23).
7. according to a kind of gas Roots flow meter described in any one in claim 1 to 6, it is characterized in that, between pressure reduction seat (3) and conduit (5), be provided with T-valve (28), a valve port of T-valve (28) is connected with conduit (5), a valve port is connected with pressure reduction seat (3), remain a valve port and be provided with large footpath section, the junction of large footpath section and valve port is provided with sealed steel ball (29), in the section of large footpath, be also provided with Compress Spring (30), one end of Compress Spring (30) and steel ball (29) against, the other end is connected in the section external port of large footpath.
8. according to a kind of gas Roots flow meter described in any one in claim 1 to 6, it is characterized in that, valve seat (9) bottom is provided with and can holds the pilot hole (31) that valve rod (10) passes, valve rod (10) is slidably connected with valve seat (9), back-moving spring (11) is set on valve rod (10), one end of back-moving spring (11) and valve seat (9) bottom butt, the other end and flap (12) butt.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210203309.1A CN102759384B (en) | 2012-06-18 | 2012-06-18 | Gas roots type flow meter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210203309.1A CN102759384B (en) | 2012-06-18 | 2012-06-18 | Gas roots type flow meter |
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| Publication Number | Publication Date |
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| CN102759384A CN102759384A (en) | 2012-10-31 |
| CN102759384B true CN102759384B (en) | 2014-07-02 |
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| CN201210203309.1A Active CN102759384B (en) | 2012-06-18 | 2012-06-18 | Gas roots type flow meter |
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| CN110487348B (en) * | 2019-08-08 | 2024-04-30 | 浙江长虹飞狮电器工业有限公司 | Gas amount detecting device for alkaline battery |
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| CN2932325Y (en) * | 2006-07-26 | 2007-08-08 | 天津市天农科技有限公司 | Milk flowmeter |
| CN202229792U (en) * | 2011-09-30 | 2012-05-23 | 浙江苍南仪表厂 | Double-waist-wheel gas Roots flow meter |
| CN202648723U (en) * | 2012-06-18 | 2013-01-02 | 浙江苍南仪表厂 | Gas Roots type flowmeter |
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| US3014508A (en) * | 1957-05-06 | 1961-12-26 | Monk Philip Reginald | Liquid dispensing apparatus |
| CN2303274Y (en) * | 1997-02-22 | 1999-01-06 | 王玉鸿 | Diaphagm type oxygen flow rate and accumulating volume meter |
| CN2932325Y (en) * | 2006-07-26 | 2007-08-08 | 天津市天农科技有限公司 | Milk flowmeter |
| CN202229792U (en) * | 2011-09-30 | 2012-05-23 | 浙江苍南仪表厂 | Double-waist-wheel gas Roots flow meter |
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| CN102759384A (en) | 2012-10-31 |
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