CN102589795A

CN102589795A - Wind pressure sensor

Info

Publication number: CN102589795A
Application number: CN2012100366447A
Authority: CN
Inventors: 方献良; 陈旭波; 茅忠群; 诸永定
Original assignee: Ningbo Fotile Kitchen Ware Co Ltd
Current assignee: Ningbo Fotile Kitchen Ware Co Ltd
Priority date: 2012-02-17
Filing date: 2012-02-17
Publication date: 2012-07-18
Anticipated expiration: 2032-02-17
Also published as: CN102589795B

Abstract

The invention discloses a wind pressure sensor which is characterized in that the sensor comprises a body seat, wherein the body seat is internally divided into a first chamber and a second chamber in mutual communication; electrolyte is contained in the first chamber and the second chamber; the height of the top of the second chamber is greater than that of the top of the first chamber; an air inlet and an air outlet are arranged on the body seat; the air inlet is communicated with the first chamber; a pressure conduction device is arranged in the air inlet; the air outlet is communicated with the second chamber; an exhaust device is arranged in the air outlet; and a potential detection component is also arranged in the second chamber. The sensor disclosed by the invention has simple structure, low production cost and high practicability, and is convenient to mount and suitable for batch production of industrial product; the sensor can detect tiny pressure change, and the detection sensitivity is high; the detected pressure can be directly applied to the electrolyte, and the accumulative error caused by part production or assembly is reduced; and moreover, the sensor suffers little influence of external interference, can effectively avoid the pollution of oil smoke, and has long service life.

Description

A kind of wind pressure sensor

Technical field

The present invention relates to a kind of sensor, particularly a kind of wind pressure sensor that is applicable to that the lampblack absorber blast detects.

Background technology

Lampblack absorber in use; When the blast of indoor oil smoke amount increase or public flue increases, improve smoke discharging effect with regard to needs adjustment motor speed with the increasing exhaust amount, traditional range hood rotating speed leans on manual shift usually; Often need the user repeatedly to regulate intervention, waste time and energy.

In order to accomplish intelligent and the hommization adjusting, many lampblack absorber products are provided with oil smoke detecting sensor (like the sensor that detects the oil temperature, the sensor that detects oil smoke pressure etc.), realize the automatic adjusting to motor speed through the feedback signal of sensor.Wherein, Wind pressure sensor is a kind of sensor the most commonly used in the industrial practice, can be used to detect the oil smoke pressure of lampblack absorber, and its principle of work is: pressure acts directly on the diaphragm of sensor; Make diaphragm produce the micrometric displacement that is directly proportional with pressure medium; The resistance of sensor is changed, with this variation of electronics wireline inspection, and standard signal corresponding to this pressure of conversion output.Like the patent No. is that the Chinese utility model " the combustion gas tool is used wind pressure sensor " of ZL200920059918.8 just discloses a kind of wind pressure sensor; It comprises metal dish, plastic disk, barrier film, diaphragm plate, sealing cap, and metal dish and plastic disk are fixed together and form an air chamber, and barrier film, diaphragm plate are installed in the air chamber respectively; The major technique characteristic is that it also comprises LOAD CELLS; Described LOAD CELLS comprises elastic beam, resistance strain gage, testing circuit, and resistance strain gage, testing circuit stick on the elastic beam, and elastic beam is provided with stiff end and pressure measurement end; Salient point on the barrier film is through the pressure measurement end in contact in sealing cap and the elastic beam; And elastic beam is fixed on the outside of metal dish, and testing circuit is provided with power input line and output line, and power input line and output line electrically connect with the controller of gas heater respectively.

But, more, the complex structure of wind pressure sensor parts of above-mentioned patent, not only manufacturing process is loaded down with trivial details, and assembly difficulty is big; In addition, the sensor of this patent is generally used on the gas heater, for the lampblack absorber product; Because there are a large amount of oil smoke to produce in the lampblack absorber use, and many because of parts in the sensor in this patent, matching relationship is complicated; Receive fume pollution easily and stop up, and then cause the parts measuring accuracy to reduce, therefore; Sensor in the above-mentioned patent has certain restriction to environment for use; Inapplicablely under soot pollution environment, use, in case and the elastic sensing element surface be damaged or lost efficacy, sensor just can't normally use.

Summary of the invention

Technical matters to be solved by this invention is that a kind of simple in structure, pressure transducer of detecting sensitivity and low cost of manufacture is provided to above-mentioned prior art present situation.

The present invention solves the problems of the technologies described above the technical scheme that is adopted: a kind of wind pressure sensor; It is characterized in that: described sensor comprises has noumenal seat; Cut apart in the said noumenal seat and form first chamber and second chamber that is interconnected; Be equipped with electrolytic solution in said first chamber and second chamber, the overhead height of said second chamber is greater than the overhead height of said first chamber; Wherein, offer air intake opening and exhausr port on the said noumenal seat, said air intake opening and said first chamber are connected, and are provided with the pressure conduction device that can be connected with the lampblack absorber air outlet in this air intake opening; Said exhausr port and said second chamber are connected, and are provided with exhaust apparatus in this exhausr port, and, also be provided with the current potential detection part that can detect electrolytic solution height in this chamber in said second chamber.

Generally; Wind pressure value when the user normally uses lampblack absorber as 200Pa about; Liquid level difference height under this wind pressure value probably is about 30mm; Liquid overflows from noumenal seat when preventing that blast from increasing, and as preferably, the height difference of described second chamber and first chamber is being good greater than 30mm.

For easy for installation; And can effectively tested air pressure be guided in the noumenal seat inner chamber; As preferably, described pressure conduction device is one to plug and the cylindrical rod member of axial limiting in said air intake opening, and said cylindrical rod member offers the inlet channel that connects vertically.So tested air pressure can enter into through the inlet channel of cylindrical rod member in first chamber, this cylindrical rod member can directly be inserted in the air intake opening, and assembling and dismounting are all very simple.

In order to make the liquid level in the noumenal seat can more significantly sense the effect that blast changes, as preferably, the inlet channel of said cylindrical rod member is formed with the air pressure exhaust opening in the bottom, and the pore size of described air pressure exhaust opening is 1～10mm.In order to prevent that oil smoke from blocking the inlet channel of cylindrical rod member; The aperture of air pressure exhaust opening is difficult for too small (less than 1mm); But the aperture of air pressure exhaust opening is unsuitable excessive (greater than 10mm) also, when the aperture is excessive; The effect of tested gas pressure on liquid level will weaken, and reduces the detection sensitivity of sensor.

In order to realize the axial limiting of cylindrical rod member; Preferred as further; The inlet channel of said cylindrical rod member is formed with air pressure and inserts the hole on the top; This air pressure inserts the hole and can the draft tube that tested air pressure is introduced be linked to each other with said exhausr port through one, and the lateral wall of said cylindrical rod member is along circumferentially forming the radially spacing snap ring of evagination, and the air intake opening upper surface of said spacing snap ring and said noumenal seat offsets and realizes the axial limiting of said cylindrical rod member at this air intake opening.So cylindrical rod member can be connected to exhausr port through draft tube, make sensor itself can be installed in the optional position, as being arranged on exhausr port, also can be arranged in the lampblack absorber casing, install more flexible.

In order to detect the variation of tested air pressure more accurately, during actual the use, as preferably, the spacing distance between the inner bottom surface of the bottom of said cylindrical rod member and said first chamber is 5～30mm.When spacing distance during less than 5mm, this moment cylindrical rod member the bottom of too close first chamber in bottom, the reacting force that air pressure affacts when discharging on the first chamber bottom surface increases, and is unfavorable for the smooth discharge of air pressure; When spacing distance during greater than 30mm, this moment, the bottom of cylindrical rod member might break away from liquid level, and air pressure remakes through air and uses on the liquid level from the air pressure exhaust opening of the cylindrical rod member back of coming out, and pressurized effect weakens, and can have influence on the detection sensitivity of sensor.

As preferably, said second chamber can be following structure: this second chamber includes left half cavity and right half chamber that is interconnected, and the overhead height in half chamber, the said right side is greater than the overhead height of said left half cavity; Wherein, said exhausr port is opened in the top, half chamber, the right side of said second chamber, and this exhausr port is the Vertical Channel of a both ends open and connection, and the bottom end opening of said exhausr port is formed with step surface; Also be communicated with through the air hole of laterally offering between the left half cavity of said second chamber and the said exhausr port, said air hole is opened in the position near said left half cavity top.

In order to guarantee the balance of inner and outer air pressure; And prevent that liquid from overflowing from exhausr port; As preferably, described exhaust apparatus includes top cover, push rod, spring and the base that is placed in the said exhausr port, wherein; The bottom of said base and said step surface offset, and said base offers the pore that runs through vertically; One end of said spring is arranged on the said base, and the other end of this spring and the bottom of said push rod offset; Said top cover is fixedly set in the top end opening of said exhausr port, and this top cover offers a through hole vertically, and said push rod can form the gap that supplied gas is discharged all the time between the top of said push rod and the bottom of said top cover under the vertical state of forward; Said push rod be inverted or heeling condition under, said spring has and drives said push rod and its top is offseted all the time and the trend of sealing said through hole with the bottom of said top cover.

Preferred as another, said second chamber also may simply be the elongated passageway vertically offered, and said exhausr port is the blind hole of a top end opening; Be communicated with through the air hole of laterally offering between said second chamber and the said exhausr port, said air hole is opened in the position near said second chamber roof.The volume of this second chamber is little; Not only saved electrolytic solution, and the structure of elongated passageway helps to improve the sensitivity of induction, when ambient pressure has trace to change; Will produce the certain liquid level difference in the elongated passageway of second chamber and change, make that the reaction of sensor is sensitive more; And be not communicated with second chamber bottom the exhausr port, can avoid getting rusty the serviceable life of elongated component behind the spring members Long contact time electrolytic solution.

Correspondingly, described exhaust apparatus includes top cover, push rod and the spring that is placed in the said exhausr port, and wherein, an end of said spring and the bottom of said exhausr port offset, and the other end of this spring and the bottom of said push rod offset; Said top cover is fixedly set in the top end opening of said exhausr port, and this top cover offers a through hole vertically, and said push rod can form the gap that supplied gas is discharged all the time between the top of said push rod and the bottom of said top cover under the vertical state of forward; Said push rod be inverted or heeling condition under, said spring has and drives said push rod and its top is offseted all the time and the trend of sealing said through hole with the bottom of said top cover.This exhaust apparatus has saved base, and structure is more simple, and assembling is more prone to.

Measuring liquid level height for ease, as preferably, described potential detection device includes a plurality of electric conductors that are parallel to each other and are provided with at interval along the vertical height direction of said second chamber.So; The quantity of electric conductor and spacing distance can be arranged according to practical measurement requirement; The liquid level at each electric conductor place has been represented an atmospheric pressure value, when liquid level arrives corresponding electric conductor height, just can record tested pressure by air pressure value at this moment through correspondent control circuits.

For the ease of installing and changing; Preferred as further, the sidewall of described second cavity vertically offers the mounting hole that is provided with at interval, and described electric conductor is a conduction copper column; Said conduction copper column plugs and is fixed in the corresponding said mounting hole; And an end of each said conduction copper column is arranged in said second cavity volume, and the other end of each said conduction copper column exposes to outside the said noumenal seat output terminal as said electric conductor.Conduction copper column has good electrical conductivity, can improve the degree of accuracy and the sensitivity of detection.

In order to realize installing and fixing of sensor,, also be provided with the stationary installation that is used for said sensor installing and locating on the described noumenal seat as preferably.

Stationary installation can adopt various structures to realize; As preferably; Described stationary installation may simply be a stamping forming plate; This plate is connected on the said noumenal seat through screw retention, and said stationary installation includes two flanks that can be respectively recline mutually with installed surface, offers connecting hole on each said flank.This fixture structure is simple, and volume is little, and installation and removal are all very convenient.

In order to make things convenient for the interpolation of electrolytic solution, as preferably, described noumenal seat also offers inlet, is connected with detachable end on the said inlet.

Compared with prior art, the invention has the advantages that: the noumenal seat of sensor is injected with electrolytic solution, when there is air pressure change in the external world; It is poor to produce certain liquid level between the cavity volume of two connections in the noumenal seat, through the conversion of control circuit, can calculate corresponding wind pressure value according to this liquid level difference; Thereby the oil smoke pressure of measuring indoor or public flue changes, simple in structure, the manufacturing and easy for installation of this sensor, and production cost is low; Practicality is big, is fit to industrial products and produces in batches; Secondly, pressure sensitive is carried out in the variation through liquid height in the testing process, can detect trickle pressure and change, and detection sensitivity is high; And, can be acted directly on this electrolytic solution by measuring pressure, through middle other components and parts, reduced the cumulative errors that cause because of parts production or assembling, improved accuracy in detection; In addition, electrolytic solution is enclosed in the noumenal seat, and electrolytic solution receives the influence of external interference little, can effectively avoid fume pollution, longer service life.

Description of drawings

Fig. 1 is one of sensor perspective view of the embodiment of the invention one.

Fig. 2 be the embodiment of the invention one the sensor perspective view two.

Fig. 3 is the sensor three-dimensional exploded view of the embodiment of the invention one.

Fig. 4 is the sensor cut-open view of the embodiment of the invention one.

Fig. 5 is the cap structure synoptic diagram of the exhaust apparatus of the embodiment of the invention one.

Fig. 6 is the cut-open view of top cover shown in Figure 5.

Fig. 7 is the noumenal seat cut-open view of the embodiment of the invention one.

Fig. 8 is the pressure conduction device cut-open view of the embodiment of the invention one.

Fig. 9 is the sensor perspective view of the embodiment of the invention two.

Figure 10 is the sensor cut-open view of the embodiment of the invention two.

Embodiment

Embodiment describes in further detail the present invention below in conjunction with accompanying drawing.

Embodiment one, referring to Fig. 1～Fig. 8:

The sensor of present embodiment can detect the variation of external pressure; Be specially adapted to detect the blast of the indoor or public flue of lampblack absorber, and, the signal that sensor arrives through corresponding control circuit conversion after; Can obtain corresponding atmospheric pressure value; And then adjust the soot motor rotating speed according to the stable output of the air quantity of demarcating, and reach smooth and easy smoke evacuation, effectively improve the environment for use of lampblack absorber.

Shown in Fig. 1～8; The sensor of present embodiment comprises has a noumenal seat 1; Offer air intake opening 11, exhausr port 12 and inlet 13 on the noumenal seat 1; Be connected with detachable end 2 on the inlet 13, injected liquid in the noumenal seat 1 in the past through inlet 13, and the capacity of adjustment liquid in noumenal seat 1; The inside of noumenal seat 1 is cut apart and is formed the first chamber A and the second chamber B that is interconnected, and the overhead height of the second chamber B is greater than the overhead height of the first chamber A; Also be provided with on the lateral wall of noumenal seat 1 and be used for the stationary installation that this sensor is installed; Stationary installation can be various mounting meanss of the prior art; Simply, can adopt a stamping forming plate 9, the body part of this plate 9 is fixedly connected on the noumenal seat 1 through screw 92; Plate 9 has two symmetrically arranged flanks 91, offers connecting hole 911 on each flank 91;

Wherein, Charged into electrolytic solution among the first chamber A and the second chamber B, the capacity of electrolytic solution is too much unsuitable, too much from noumenal seat 1, overflows easily; The capacity of electrolytic solution also is difficult for very few; Cross boundary's air pressure is bigger outside at least state and can't reach predetermined liquid level difference down, as preferably, the capacity that electrolytic solution accounts for the first chamber A in the present embodiment is about 90%; The air intake opening 11 and the first chamber A are connected, and are provided with the pressure conduction device that can be connected with the air outlet of lampblack absorber in this air intake opening 11, and the pressure conduction device is used for tested air pressure is incorporated in the noumenal seat 1;

The second chamber B of present embodiment includes left half cavity and right half chamber that is interconnected, and the overhead height in right half chamber is greater than the overhead height of left half cavity; Wherein, exhausr port 12 is opened in the top, half chamber, the right side of the second chamber B, and exhausr port 12 is the Vertical Channel of a both ends open and connection, and half chamber, the right side of the bottom end opening of exhausr port 12 and second chamber is connected; Be communicated with through the air hole of laterally offering 15 again between the left half cavity of the second chamber B and the exhausr port 12; In order can the gas at left half cavity top fully to be discharged; The height of air hole 15 should be offered near the position at left half cavity top, will be higher than the height of the fundamental measurement stroke of sensor at least;

Also be provided with exhaust apparatus in the exhausr port 12; Exhaust apparatus can be discharged gas outside the second chamber B when the pressure in the second chamber B increases; Thereby keep air pressure and ambient atmosphere equilibrium in the second chamber B; Can also prevent simultaneously sensor under inclination or inversion state, electrolytic solution overflows from noumenal seat; Also be provided with the current potential detection part that can detect electrolytic solution height in this chamber among the second chamber B, the induction output terminal of current potential detection part and the input end of speed-regulating control circuit link to each other;

Generally; The wind pressure value that the user produces when normally using lampblack absorber as 200Pa about, probably can produce the liquid level difference height about 30mm under this wind pressure value, liquid overflows from noumenal seat 1 when preventing that blast from increasing; Should guarantee to have bigger difference in height between the second chamber B top and the first chamber A top; Being good greater than 30mm, as preferably, the second chamber B top of present embodiment and the difference in height at the first chamber A top are chosen as 50mm.

Pressure conduction device in the present embodiment is a cylindrical rod member 3 that is inserted in the air intake opening 11, and in order to let air pressure be passed among the first chamber A, cylindrical rod member 3 offers the inlet channel 31 that connects vertically; The inlet channel 31 of cylindrical rod member 3 is formed with air pressure exhaust opening 32 in the bottom; The aperture of air pressure exhaust opening 32 is difficult for inlet channel 31 obstructions that too small, too small aperture causes cylindrical rod member 3 easily, and the aperture of air pressure exhaust opening 32 also is difficult for excessive; Excessive aperture can't the significant reaction external pressure variation; Reduce the sensitivity that air pressure detects easily, preferably, the pore size of air pressure exhaust opening 32 is advisable with 1～10mm; In addition; Cylindrical rod member 3 inserts precision and the sensitivity that the interior degree of depth of the first chamber A also can influence detection; The bottom of cylindrical rod member 3 can not offset with the inner bottom surface of the first chamber A, can not break away from liquid level, in order to reach quite good detecting effectiveness; React the variation of external pressure exactly, the spacing distance between the inner bottom surface of the bottom of cylindrical rod member 3 and the first chamber A is preferably 5～30mm;

The installation of sensor for ease; The top of cylindrical rod member 3 also is formed with air pressure and inserts hole 33; Can insert at air pressure and be connected with the draft tube that can tested air pressure be imported on the hole 33; Tested air pressure can transfer among the first chamber A through draft tube, and the installation site of sensor itself just can be provided with arbitrarily according to actual conditions, uses more convenient flexible; Because the open at both ends of cylindrical rod member 3; When preventing that noumenal seat from toppling over, liquid overflows from cylindrical rod member 3 (pressure conduction device) or pours out, and the air pressure at cylindrical rod member 3 tops inserts the diaphragm seal (like pellosil) that can also be provided with one deck elastically deformable in the hole 33; Ambient pressure is delivered on the diaphragm seal earlier; Remake through diaphragm seal then and use on the liquid, diaphragm seal itself had both played sealing function, played the effect of transmitting pressure again; Diaphragm seal need be close to liquid surface setting, the accuracy that can improve barometric surveying as far as possible; Fall among the first chamber A in order to prevent cylindrical rod member 3; The lateral wall of cylindrical rod member 3 is along circumferentially forming the radially spacing snap ring 34 of evagination, and this spacing snap ring 34 can offset with air intake opening 11 upper surfaces of noumenal seat 1 and realize the axial limiting of cylindrical rod member 3 at this air intake opening 11.

The exhaust apparatus of present embodiment adopts following structure: this exhaust apparatus includes top cover 4, push rod 5, spring 6 and the base 7 that is placed in respectively in the exhausr port 12; Wherein, Position that the bottom of exhausr port 12 and the second chamber B are connected forms T shape pore structure, promptly forms step surface 121 on the bottom end opening of exhausr port 12, and base 7 is limited on the step surface 121 with exhausr port 12; Base 7 has a groove; One end of spring 6 is placed in the groove of base 7, and base 7 also offers the pore 71 that runs through vertically, and the bottom of the other end of spring 6 and push rod 5 offsets; And; The cross section of top cover 4 becomes T shape, and this top cover 4 offers a through hole 43 vertically, and the T shape stub end 41 of top cover 4 can be limited in the top of exhausr port 12; The T shape microcephaly of top cover 4 holds in 42 top end openings that are placed in exhausr port 12, and this top cover 4 is connected for wringing fit with exhausr port 12; In order to guarantee the smooth discharge of gas in normal operation, push rod 5 can form the gap that supplied gas is discharged all the time between the bottom of the top of push rod 5 and top cover 4 under the vertical state of forward; And when sensor run-off the straight rollover or inversion, overflow from exhausr port 12 in order to prevent electrolytic solution, push rod 5 is under inversion or heeling condition; Spring 6 has and drives that top that push rod 5 makes this push rod 5 offsets with the bottom of top cover 4 all the time and with the trend of through hole 43 sealings, the top cover 4 is here formed a retaining valve with push rod 5, has only under normal operating condition; Gas can be discharged from exhausr port 12; In case tilt or be inverted, then push rod 5 through hole 43 that is about to top cover 4 is shut, and prevents that electrolytic solution from flowing out.So; During work; Air pressure in the second chamber B increases; Gas can finally be discharged from through hole 43 through the slit between slit, push rod 5 and top cover 4 bottoms between exhausr port 12 and the push rod 5, equates thereby make the interior air pressure of the second chamber B keep all the time with external atmospheric pressure, guarantees that the liquid level difference that produces between the first chamber A and the second chamber B can accurately reflect the air pressure of public flue.

The potential detection device of present embodiment is mainly the electric conductor 8 that contact can produce voltage behind the electrolytic solution; Present embodiment is selected electric conductivity favorable conductive copper post (also can be other conductors); Electric conductor 8 has vertical height directions a plurality of and the edge second chamber B in parallel to each other to be provided with at interval; The atmospheric pressure value gear that the quantity of electric conductor 8 is measured according to actual needs confirms that the sidewall of the second chamber B vertically offers the mounting hole 14 that is provided with at interval, and electric conductor 8 plugs and is fixed in the corresponding mounting hole 14; One end of each electric conductor 8 is arranged in second cavity volume, and the other end of each electric conductor 8 exposes to outside the noumenal seat 1 output terminal as electric conductor 8.

Present embodiment utilizes the state equation of ideal gas: the PV=nRT formula; Also have liquid pressure formula: P=ρ gh, the first chamber A in the sensor body seat 1 and the second chamber B form a linker, under no flue pressure state; Two interior atmospheric pressures of cavity are P1=P2; Liquid pressures in two cavitys are P3=P4, i.e. P1+P3=P2+P4, and first cavity is equal with the liquid level of the second chamber B; When flue pressure changed, flue pressure acted on the liquid level of first cavity through air intake opening 11, produced pressure Δ P; This moment, in order to keep the pressure equilibrium of two cavitys, the liquid level in the second chamber B rises and produces pressure was the liquid level difference of P0 owing to P1+P3+ Δ P＞P2+P4; When reaching stable state, P1+P3+ Δ P=P2+P4+P0, i.e. Δ P=P0=ρ gh; Here, ρ represents the density of electrolytic solution, and h represents the liquid level difference height of the first chamber A and the second chamber B; Different pressures can produce differing heights h, feeds back to correspondent control circuits through the current potential detection part, can calculate the force value in public air channel through this control electricity.

Embodiment two, referring to Fig. 9, Figure 10:

The sensor construction of present embodiment two and embodiment one are basic identical; The concrete shape of different are second chamber, exhausr port; And the mode of communicating of second chamber and exhausr port; For to show difference, with a numeral of casting aside, all the other structures still keep the mark identical with embodiment one to the structure that will be different from embodiment one in the present embodiment two in Reference numeral.

The second chamber B ' of present embodiment two is the elongated passageway vertically offered; The cavity of elongated passageway shape has not only been saved electrolytic solution; And can make that the detection of sensor is sensitive more, in case ambient pressure changes, then obvious variation just can take place in the liquid level among the second chamber B '; Be convenient to more detect, improved detection sensitivity;

In addition, the exhausr port 12 ' in the present embodiment two is the blind hole of a top end opening, is communicated with through the air hole of laterally offering 15 ' between the second chamber B ' and the exhausr port 12 ', and air hole 15 ' is opened in the position near the second chamber B ' top;

Wherein, exhaust apparatus includes top cover 4 ', the push rod 5 ' and spring 6 ' that is placed in the exhausr port 12 ', and an end of spring 6 ' and the bottom of exhausr port 12 ' offset, and the other end of spring 6 ' and the bottom of push rod 5 ' offset; Top cover 4 ' is fixedly set in (both are wringing fit) in the top end opening of exhausr port 12 ', and top cover 4 ' offers a through hole 43 ' vertically; The top cover 4 ' is here formed a retaining valve with push rod 5 ', when push rod 5 ' under the vertical state of forward (normal operating conditions), can form the gap of supplied gas discharge between the top of push rod 5 ' and the bottom of top cover 4 ' all the time; When push rod 5 ' be inverted or heeling condition under, spring 6 ' has and drives push rod 5 ' and its top is offseted all the time and the trend of sealing through hole 43 ' with the bottom of top cover 4 ', after push rod 5 ' is sealed through hole 43 ', just can prevent that electrolytic solution from flowing out from exhausr port.

Claims

1. wind pressure sensor; It is characterized in that: described sensor comprises has noumenal seat (1), cuts apart in the said noumenal seat (1) to form first chamber (A) and second chamber (B, B ') that is interconnected; Said first chamber (A) and the second chamber (B; B ') be equipped with electrolytic solution in, the overhead height of said second chamber (B, B ') is greater than the overhead height of said first chamber (A); Wherein, offer air intake opening (11) and exhausr port (12,12 ') on the said noumenal seat (1), said air intake opening (11) and said first chamber (A) are connected, and are provided with the pressure conduction device that can be connected with the lampblack absorber air outlet in this air intake opening (11); Said exhausr port (12,12 ') and said second chamber (B, B ') are connected, and this exhausr port is provided with exhaust apparatus in (12,12 '), and, also be provided with the current potential detection part that can detect electrolytic solution height in this chamber in said second chamber (B, B ').

2. wind pressure sensor according to claim 1 is characterized in that: described second chamber (B, B ') is greater than 30mm with the height difference of first chamber (A).

3. wind pressure sensor according to claim 1; It is characterized in that: described pressure conduction device is one to plug and the cylindrical rod member (3) of axial limiting in said air intake opening (11), and said cylindrical rod member (3) offers the inlet channel (31) that connects vertically.

4. wind pressure sensor according to claim 3 is characterized in that: the inlet channel (31) of said cylindrical rod member (3) is formed with air pressure exhaust opening (32) in the bottom, the pore size of described air pressure exhaust opening (32) is 1～10mm.

5. wind pressure sensor according to claim 3; It is characterized in that: the inlet channel (31) of said cylindrical rod member (3) is formed with air pressure and inserts hole (33) on the top; This air pressure inserts hole (33) can be with the draft tube and the said exhausr port (12 of tested air pressure importing through one; 12 ') link to each other; The lateral wall of said cylindrical rod member (3) is along circumferentially forming the radially spacing snap ring (34) of evagination, and said spacing snap ring (34) offsets and realizes the axial limiting of said cylindrical rod member (3) in this air intake opening (11) with air intake opening (11) upper surface of said noumenal seat (1).

6. wind pressure sensor according to claim 3 is characterized in that: the spacing distance between the inner bottom surface of the bottom of said cylindrical rod member (3) and said first chamber (A) is 5～30mm.

7. wind pressure sensor according to claim 1 is characterized in that: said second chamber (B) includes left half cavity and right half chamber that is interconnected, and the overhead height in half chamber, the said right side is greater than the overhead height of said left half cavity; Wherein, said exhausr port (12) is opened in the top, half chamber, the right side of said second chamber (B), and this exhausr port (12) is the Vertical Channel of a both ends open and connection, and the bottom end opening of said exhausr port (12) is formed with step surface (121); Also be communicated with through the air hole of laterally offering (15) between the left half cavity of said second chamber (B) and the said exhausr port (12), said air hole (15) is opened in the position near said left half cavity top.

8. wind pressure sensor according to claim 7; It is characterized in that: described exhaust apparatus includes top cover (4), push rod (5), spring (6) and the base (7) that is placed in the said exhausr port (12); Wherein, The bottom of said base (7) and said step surface (121) offset, and said base (7) offers the pore (71) that runs through vertically; One end of said spring (6) is arranged on the said base (7), and the bottom of the other end of this spring (6) and said push rod (5) offsets; Said top cover (4) is fixedly set in the top end opening of said exhausr port (12); This top cover (4) offers a through hole (43) vertically; Said push rod (5) can form the gap that supplied gas is discharged all the time between the bottom of the top of said push rod (5) and said top cover (4) under the vertical state of forward; Said push rod (5) be inverted or heeling condition under, said spring (6) has and drives said push rod (5) and its top is offseted all the time and the trend of sealing said through hole (43) with the bottom of said top cover (4).

9. wind pressure sensor according to claim 1 is characterized in that: said second chamber (B ') is the elongated passageway vertically offered, and said exhausr port (12 ') is the blind hole of a top end opening; Be communicated with through the air hole of laterally offering (15 ') between said second chamber (B ') and the said exhausr port (12 '), said air hole (15 ') is opened in the position near said second chamber (B ') top.

10. wind pressure sensor according to claim 9; It is characterized in that: described exhaust apparatus includes top cover (4 '), push rod (5 ') and the spring (6 ') that is placed in the said exhausr port (12 '); Wherein, One end of said spring (6 ') and the bottom of said exhausr port (12 ') offset, and the bottom of the other end of this spring (6 ') and said push rod (5 ') offsets; Said top cover (4 ') is fixedly set in the top end opening of said exhausr port (12 '); This top cover (4 ') offers a through hole (43 ') vertically; Said push rod (5 ') can form the gap that supplied gas is discharged all the time between the bottom of the top of said push rod (5 ') and said top cover (4 ') under the vertical state of forward; Said push rod (5 ') be inverted or heeling condition under, said spring (6 ') has and drives said push rod (5 ') and its top is offseted all the time and the trend of sealing said through hole (43 ') with the bottom of said top cover (4 ').

11. wind pressure sensor according to claim 1 is characterized in that: described potential detection device includes a plurality of be parallel to each other and along the electric conductor (8) that is provided with at interval of vertical height direction of said second chamber (B).

12. wind pressure sensor according to claim 11; It is characterized in that: the sidewall of described second chamber (B) vertically offers the mounting hole (14) that is provided with at interval; Described electric conductor (8) is a conduction copper column, and said conduction copper column plugs and is fixed in the corresponding said mounting hole (14), and; One end of each said conduction copper column is arranged in said second cavity volume, and the other end of each said conduction copper column exposes to outside the said noumenal seat (1) output terminal as said electric conductor (8).

13. according to the described wind pressure sensor of arbitrary claim in the claim 1～12, it is characterized in that: described noumenal seat also is provided with the stationary installation that is used for said sensor installing and locating on (1).

14. wind pressure sensor according to claim 13; It is characterized in that: described stationary installation is a stamping forming plate (9); This plate (9) is connected on the said noumenal seat (1) through screw retention; Said stationary installation includes two flanks (91) that can be respectively recline mutually with installed surface, offers connecting hole (911) on each said flank (91).

15. according to the described wind pressure sensor of arbitrary claim in the claim 1～12, it is characterized in that: described noumenal seat (1) also offers inlet (13), is connected with detachable end (2) on the said inlet (13).