CN206585758U - A kind of pistonphone of diaphragm seal - Google Patents
A kind of pistonphone of diaphragm seal Download PDFInfo
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- CN206585758U CN206585758U CN201720254527.6U CN201720254527U CN206585758U CN 206585758 U CN206585758 U CN 206585758U CN 201720254527 U CN201720254527 U CN 201720254527U CN 206585758 U CN206585758 U CN 206585758U
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- cavity
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- diaphragm
- pistonphone
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Abstract
A kind of pistonphone of diaphragm seal, with cavity, the bearing of piston and holding cavity, piston is coaxial with cavity, and cavity one end open, the other end, which have, sets mounting hole on end plate, end plate, and piston is located at the openend of cavity；The opening of sealing film closed cavity forms sounding chamber, and sealing film is flexible, and the sounding end face of piston is fitted with sealing film；Balancing orifice, the balancing orifice connection external world and sounding chamber are offered on cavity, balancing orifice is opened on end plate.Mounting hole is calibrated sensor for installation.The utility model has the advantage of：With sealing film closed cavity formation sounding chamber, balancing orifice on cavity only by setting is connected with ambient atmosphere, to realize static pressure equilibrating mechanism, because the aperture of balancing orifice is superfine, so sounding cavity has larger time constant, so that the lower limit working frequency of pistonphone is greatly reduced.
Description
Technical field
The utility model belongs to acoustic metrology technical field, is related to a kind of pistonphone.
Technical background
Microphone is the energy conversion device that voice signal is converted to electric signal, is the important step of electroacoustics system, extensively
The numerous areas such as vocal music, communication, space flight are applied to generally.In order to ensure microphone output signal accurate and effective, examined according to metering
The regulation for journey of establishing rules, before dispatching from the factory or using after a period of time, it is necessary to the properties such as sensitivity, frequency response to microphone
Index is calibrated.
Pistonphone is the important device for realizing pressure sensitivity of microphone calibration, and it drives piston by exciting bank
The sinusoidal vibration of given frequency and amplitude is done, the sound field that can determine that acoustic pressure, the open-circuit voltage pair with microphone are formed in cavity
Than can determine that its sound pressure sensitivity.The sound field that microphone front end is inserted in cavity, the front side and cavity of vibrating diaphragm during calibration
Contact, and vibrating diaphragm back cavity then with external environment UNICOM, in order to reduce external environment fluctuation（Such as air pressure and temperature change）It is right
The influence of microphone calibration result is, it is necessary to which cavity also balances static pressure between the two with external environment UNICOM, and this is typically by piston and chamber
Realize in gap between body.But the gap between piston and cavity is one of difficult point of pistonphone design, main cause
It is：1）If gap is too small, during reciprocating motion of the pistons, it is easy to friction is produced between cavity, is made an uproar so as to produce friction
Sound and the displacement wave distortion (not being preferable sine wave) of piston output, in turn result in sound pressure signal and also produce distortion；2）
If gap is excessive, the gap between piston and cavity constitutes the circulation passage of gaseous medium, will cause letting out for acoustic pressure in cavity
Leakage, so that acoustic pressure leakage errors is produced, and also the working frequency of pistonphone is lower, and leakage errors is bigger.Because gap is close
The limitation of envelope, clearance seal formula pistonphone is unable to reach relatively low lower limit working frequency.
The content of the invention
The purpose of this utility model is to provide one kind by diaphragm seal cavity, and lower limit working frequency is far below clearance-type
Sealed diaphragm seal pistonphone.
A kind of pistonphone of diaphragm seal, with cavity, the bearing of piston and holding cavity, piston is same with cavity
Axle, cavity one end open, the other end, which have, sets mounting hole on end plate, end plate, piston is located at the openend of cavity；Its feature exists
In：The opening of sealing film closed cavity forms sounding chamber, and sealing film is flexible, and sounding end face and the sealing film of piston are pasted
Close；Balancing orifice, the balancing orifice connection external world and sounding chamber are offered on cavity, balancing orifice is opened on end plate.Mounting hole is used to pacify
Dress is calibrated sensor.
The attachment structure of sealing film and cavity is further defined to：Sealed and connected by film assembly between cavity and piston
Connect, film assembly is mainly by flexible sealing film, diaphragm basic ring and tensioning ring composition, tensioning ring, diaphragm basic ring and piston
Coaxially, piston is in diaphragm basic ring, and sealing film is tightened up ring and diaphragm basic ring clamping.Because piston is located in diaphragm basic ring,
Therefore sealing film is necessarily located between cavity and diaphragm basic ring.Diaphragm seal cavity is used, is not present and lets out between piston and cavity
Passage is leaked, the decay of acoustic pressure in cavity will not be caused, larger gap can be designed between piston and cavity to reduce the peace of piston
Fill difficulty.
Further, diaphragm basic ring is made up of clamping portion and fastening part, and clamping portion is in tensioning ring, tensioning ring and clamping portion
Mating surface is inclined-plane；Fastening part is a circle flange, and fastening part is evenly distributed with multiple first screws；It is uniformly distributed on tensioning ring
There are multiple fastening screws, trip bolt screws in fastening screw through the first screw, so that fixed strain ring and diaphragm basic ring.
To ensure the axiality of cavity, film assembly and piston and setting up connection, further limit：In cavity and film group
Locating flange is set, and locating flange has cavity connecting portion and back-up ring, back-up ring coordinates with film assembly gap between part, back-up ring with
The inner ring of locating flange is coaxial, and film assembly is located within back-up ring, and cavity is fixed on cavity connecting portion by trip bolt.
The fastening part of diaphragm basic ring, which is evenly distributed with the second screw, tensioning ring, is uniformly distributed connection through hole, attachment screw
Locating flange is screwed in through the second screw and connection through hole, so that tensioning ring and diaphragm basic ring be fixed with locating flange.
In order that the air-tightness of cavity is good, further limit：Sealing ring is set between cavity and locating flange.Positioning mode
It is engaged between blue cavity connecting portion and diaphragm basic ring by projection-sunk structure.When projection is arranged at cavity connecting portion, diaphragm
It is corresponding on matrix that depression is set；When projection is arranged on diaphragm matrix, cavity connecting portion is corresponding to set depression.Projection will be close
In sealing film press-in depression, sealing function is also functioned to.
Further, in the middle part of bearing it is through hole, piston and film assembly are in bearing, and locating flange is consolidated with bearing one end
Fixed, the outside wall surface of back-up ring and the internal face gap of bearing coordinate.
In order to obtain higher piston acceleration, the structure of further piston is：During piston is cylindrical structure, piston
It is empty；The sounding end seal of piston is closed, another end opening, and the openend of piston and the driving part of exciting bank are connected.Piston is hollow
So that piston mass is light, it is easy to obtain higher piston movement acceleration.
The utility model realizes static pressure equilibrating mechanism by balancing orifice, and static pressure equilibrium refers to inside cavity gas and air
Connection, air pressure is equal with atmospheric pressure in cavity when static, to reduce external environment fluctuation（Such as air pressure and temperature change）To transaudient
The influence of device calibration result.After piston is connected with driver unit, driver unit band piston moves reciprocatingly with respect to cavity.Sealing
Film encloses the opening of cavity, during piston movement, sealing film deformation with the motion of piston, and sounding chamber is only by pressing
Hole is in communication with the outside, and the hole of balancing orifice is much smaller than using the gap between piston and cavity during clearance seal, so that greatly
The leakage of acoustic pressure in cavity is reduced, thereby guarantees that diaphragm seal cavity has normal much larger than the leak time of clearance seal cavity
Number, so that the lower limit working frequency of pistonphone is greatly reduced.Balancing orifice is smaller, and the lower limit working frequency of pistonphone is got over
It is low.
The utility model has the advantage of：Formed with sealing film closed cavity on sounding chamber, cavity and only pass through setting
Balancing orifice is connected with ambient atmosphere, to realize static pressure equilibrating mechanism, because the aperture of balancing orifice is superfine, so sounding cavity has
Larger time constant, so that the lower limit working frequency of pistonphone is greatly reduced.
Brief description of the drawings
Fig. 1 is front view of the present utility model.
Fig. 2 is sectional view of the present utility model.
Fig. 3 is the connection diagram of cavity, tensioning ring and diaphragm basic ring.
Fig. 4 is locating flange schematic diagram.
Fig. 5 is decomposing schematic representation of the present utility model.
Embodiment
As Figure 1-3, the pistonphone of diaphragm seal, with cavity 11, the bearing 2 of piston 1 and holding cavity 11,
Piston 1 and cavity 11 are coaxial, cavity 11 and the centering of bearing 2, and the one end open of cavity 11, the other end have on end plate 111, end plate 111
Set mounting hole that proofing microphone 10 is installed, piston 1 is located at the openend of cavity 11；The opening of the closed cavity 11 of sealing film 7
Sounding chamber is formed, sealing film 7 is flexible, and the sounding end face of piston 1 is fitted with sealing film 7；Offer and press on cavity 11
Hole 9, balancing orifice 9 connects extraneous and sounding chamber, and balancing orifice 9 is opened on end plate.
In order to ensure being brought into close contact, it is necessary to which piston 1 is into cavity 11 of piston 1 and sealing film 7 in the device course of work
Promote a certain distance as its moving equilibrium position, to ensure piston 1 in reciprocating motion, piston 1 is in film 7 all the time
It is close to state.
Microphone 10 is installed in end plate, the front end of microphone 10 insertion cavity 11, and piston 1 heads on sealing film 7 and cavity
Air contact in 11, piston 1 vibrates along the axial reciprocating of cavity 11 produces sound field in cavity 11.
The attachment structure of sealing film 7 and cavity 11 is defined to：Sealed and connected by film assembly between cavity 11 and piston 1
Connect, film assembly is mainly made up of flexible sealing film 7, diaphragm basic ring 3 and tensioning ring 5, tensioning ring 5, the and of diaphragm basic ring 3
Piston 1 is coaxial, and piston 1 is in diaphragm basic ring 3, and sealing film 7 is tightened up ring 5 and the clamping of diaphragm basic ring 3.Piston 1 is located at diaphragm
In basic ring 3, therefore sealing film 7 is necessarily located between cavity 11 and diaphragm basic ring 3.Device is living by the seal cavity 11 of film 7
Leakage path is not present between plug 1 and cavity 11, the decay of acoustic pressure in cavity 11 will not be caused, can between piston 1 and cavity 11
Larger gap is designed to reduce the installation difficulty of piston 1.
Diaphragm basic ring 3 is made up of fastening part 31 and clamping portion 32, and tensioning ring 5 is outside clamping portion 32, tensioning ring 5 and diaphragm
The mating surface of basic ring 3 is inclined-plane, and fastening part 31 is to be evenly distributed with multiple first screws 42 on a circle flange, fastening part 31；
Multiple fastening screws 41 are evenly distributed with tensioning ring 5, trip bolt 4 screws in fastening screw 41 through the first screw 42, so that
Be strained and fixed tensioning ring 5 and diaphragm basic ring 3, forms tensioning ring-diaphragm basic ring sub-assembly.
As shown in figure 3, tensioning ring 5 is close to the direction that the direction of fastening part 31 is that sealing film 7 is tightened up, the sealing of inclined-plane edge
The tension direction of film 7 gradually rises, when tensioning ring 5 and diaphragm basic ring 3 are mutually drawn nearer by bolt, tensioning ring 5 and diaphragm
It is tighter that basic ring 3 is combined, and sealing film 7 is drawn tighter.
To ensure cavity 11, film assembly and the axiality of piston 1：Positioning mode is set between cavity 11 and film assembly
Orchid 14.As shown in figure 4, locating flange 14 has cavity connecting portion 142 and back-up ring 141, the inner ring of back-up ring 141 and locating flange 14
Coaxially, film assembly is located within back-up ring 141, and back-up ring 141 and film assembly are coaxial.The fastening part 31 of diaphragm basic ring 3 is uniformly divided
It is furnished with the second screw 131, tensioning ring 5 and is uniformly distributed connection through hole 132, connect the inner wall smooth non-threaded of through hole 132, connects spiral shell
Nail 13 screws in locating flange 14 through the second screw 131 and connection through hole 132, thus by tensioning ring-diaphragm basic ring sub-assembly with
Locating flange 14 is fixed.
As shown in Fig. 2 the outer wall of cavity 11 has adpting flange 112, adpting flange 112 is by attachment screw 8 and locating flange
14 fix.Adpting flange 112 and the one of cavity 11.
In order that the air-tightness of cavity 11 is good：Sealing ring 12, locating flange are set between cavity 11 and locating flange 14
It is engaged between 14 cavity connecting portion and diaphragm basic ring 3 by projection-sunk structure, when projection is arranged at cavity connecting portion, film
Depression is arranged in correspondence with piece basic ring 3, as shown in Figure 3；When projection is arranged on diaphragm basic ring 3, cavity connecting portion is corresponding to be set
Put depression.It is raised that sealing film 7 is pressed into depression, also function to sealing function.
As shown in figure 5, the middle part of bearing 2 is through hole, piston 1 and film assembly are located in bearing 2, locating flange 14 and bearing
2 one end are fixed, and the outside wall surface of back-up ring 141 coordinates with the internal face gap of bearing 2.
In order to obtain the higher acceleration of piston 1, the structure of piston 1 is：Piston 1 is cylindrical structure, and piston 1 is hollow；
The sounding end seal of piston 1 is closed, another end opening, and the openend of piston 1 and the driving part of exciting bank are connected.Piston 1 is hollow
So that the light weight of piston 1, it is easy to obtain the higher acceleration of motion of piston 1.
The utility model realizes static pressure equilibrating mechanism by balancing orifice 9, to reduce external environment fluctuation（Such as air pressure and temperature
Change）Influence to the calibration result of microphone 10, after piston 1 is connected with driver unit, driver unit band piston 1 is with respect to cavity
11 move reciprocatingly.Sealing film 7 encloses the opening of cavity 11, and when piston 1 is moved, sealing film 7 is moved simultaneously with piston 1
Ensure that film 7 is close to all the time with piston 1, sounding chamber is only in communication with the outside by balancing orifice 9, the hole of balancing orifice 9, which is much smaller than, to be adopted
With the gap between piston during clearance seal 1 and cavity 11, the leakage of acoustic pressure in cavity 11 is greatly reduced, is thereby guaranteed that thin
Film seal cavity 11 has the leak time constant much larger than clearance seal cavity, so that the lower limit of pistonphone is greatly reduced
Working frequency.Balancing orifice 9 is smaller, and the lower limit working frequency of pistonphone is lower.
The utility model has the advantage of：Formed with sealing film closed cavity on sounding chamber, cavity and only pass through setting
Balancing orifice is connected with ambient atmosphere, to realize static pressure equilibrating mechanism, because the aperture of balancing orifice is superfine, so sounding cavity has
Larger time constant, so that the lower limit working frequency of pistonphone is greatly reduced.
Content described in this specification embodiment is only enumerating to the way of realization of utility model design, and this practicality is new
The protection domain of type is not construed as being only limitted to the concrete form that embodiment is stated, protection domain of the present utility model also and
In those skilled in the art according to the utility model conceive it is conceivable that equivalent technologies mean.
Claims (9)
1. a kind of pistonphone of diaphragm seal, with cavity, the bearing of piston and holding cavity, piston is coaxial with cavity,
Cavity one end open, the other end, which have, sets mounting hole on end plate, end plate, piston is located at the openend of cavity；It is characterized in that：It is close
The opening of sealing film closed cavity forms sounding chamber, and sealing film is flexible, and the sounding end face of piston is fitted with sealing film；Chamber
Balancing orifice, the balancing orifice connection external world and sounding chamber are offered on body, balancing orifice is opened on end plate.
2. the pistonphone of diaphragm seal as claimed in claim 1, it is characterised in that：Pass through film group between cavity and piston
Part is tightly connected, and film assembly is mainly by flexible sealing film, diaphragm basic ring and tensioning ring composition, tensioning ring, diaphragm base
Ring and piston coaxial, piston is in diaphragm basic ring, and sealing film is tightened up ring and diaphragm basic ring clamping.
3. the pistonphone of diaphragm seal as claimed in claim 2, it is characterised in that：Diaphragm basic ring is by clamping portion and fastening part
Composition, clamping portion is in tensioning ring, and the mating surface in tensioning ring and clamping portion is inclined-plane；Fastening part is a circle flange, fastening part
It is evenly distributed with multiple first screws；Multiple fastening screws are evenly distributed with tensioning ring, trip bolt revolves through the first screw
Enter to fasten screw.
4. the pistonphone of diaphragm seal as described in one of claim 1-3, it is characterised in that：Cavity and film assembly it
Between locating flange is set, locating flange has cavity connecting portion and back-up ring, and back-up ring coordinates with film assembly gap, back-up ring and positioning
The inner ring of flange is coaxial, and film assembly is located within back-up ring, and cavity is fixed on cavity connecting portion by trip bolt.
5. the pistonphone of diaphragm seal as claimed in claim 4, it is characterised in that：The fastening part of diaphragm basic ring is uniformly distributed
Have and connection through hole is uniformly distributed on the second screw, tensioning ring, attachment screw screws in positioning mode through the second screw and connection through hole
It is blue.
6. the pistonphone of diaphragm seal as claimed in claim 5, it is characterised in that：Set between cavity and locating flange close
Seal, is engaged between the cavity connecting portion and diaphragm basic ring of locating flange by projection-sunk structure.
7. the pistonphone of diaphragm seal as claimed in claim 6, it is characterised in that：When projection is arranged at cavity connecting portion,
It is corresponding on diaphragm matrix that depression is set；When projection is arranged on diaphragm matrix, cavity connecting portion is corresponding to set depression.
8. the pistonphone of diaphragm seal as claimed in claim 7, it is characterised in that：It is through hole in the middle part of bearing, piston and thin
Membrane module is located in bearing, and locating flange is fixed with bearing one end, and the outside wall surface of back-up ring and the internal face gap of bearing coordinate.
9. the pistonphone of diaphragm seal as claimed in claim 8, it is characterised in that：During piston is cylindrical structure, piston
It is empty；The sounding end seal of piston is closed, another end opening, and the openend of piston and the driving part of exciting bank are connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720254527.6U CN206585758U (en) | 2017-03-16 | 2017-03-16 | A kind of pistonphone of diaphragm seal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720254527.6U CN206585758U (en) | 2017-03-16 | 2017-03-16 | A kind of pistonphone of diaphragm seal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206585758U true CN206585758U (en) | 2017-10-24 |
Family
ID=60113656
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720254527.6U Active CN206585758U (en) | 2017-03-16 | 2017-03-16 | A kind of pistonphone of diaphragm seal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206585758U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106921920A (en) * | 2017-03-16 | 2017-07-04 | 浙江大学 | A kind of pistonphone of diaphragm seal |
| CN110248291A (en) * | 2019-06-29 | 2019-09-17 | 江苏润桐数据服务有限公司 | Using the loudspeaker in HIFI speaker with gas-tight ring and reinforce damping method |
-
2017
- 2017-03-16 CN CN201720254527.6U patent/CN206585758U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106921920A (en) * | 2017-03-16 | 2017-07-04 | 浙江大学 | A kind of pistonphone of diaphragm seal |
| CN106921920B (en) * | 2017-03-16 | 2023-09-01 | 浙江大学 | Piston sounder sealed by film |
| CN110248291A (en) * | 2019-06-29 | 2019-09-17 | 江苏润桐数据服务有限公司 | Using the loudspeaker in HIFI speaker with gas-tight ring and reinforce damping method |
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