CN203596919U - Pistonphone with gap seal structure - Google Patents
Pistonphone with gap seal structure Download PDFInfo
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- CN203596919U CN203596919U CN201320794565.2U CN201320794565U CN203596919U CN 203596919 U CN203596919 U CN 203596919U CN 201320794565 U CN201320794565 U CN 201320794565U CN 203596919 U CN203596919 U CN 203596919U
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Abstract
Provided is a pistonphone with a gap seal structure. The pistonphone comprises a cavity body, a piston and a support device; a guide piece is arranged between the cavity body and the piston; the outer surface of the guide piece is in sealed connection with the inner wall of the cavity body; the inner surface is in clearance fit with the piston; the guide piece and the cavity body are coaxial; the outer surface of the guide piece is provided with an annular air duct; communication air holes pointing to the axis of guide piece are uniformly distributed in the annular air duct; and an air source port is communicated with the annular air duct. The pistonphone is advantaged by capability of reducing sound pressure leakage in the cavity body and ensuring no friction between the piston and the cavity body.
Description
Technical field
The utility model belongs to acoustic metrology technical field, particularly relates to a kind of pistonphone.
Technical background
Microphone is the energy conversion device that voice signal is converted to the signal of telecommunication, is the important step of electroacoustics system, is widely used in the numerous areas such as vocal music, communication, space flight.In order to guarantee microphone output signal accurate and effective, according to the regulation of measurement verification regulations, must or use after a period of time before dispatching from the factory, the property indices such as sensitivity, frequency response of microphone is calibrated.
Pistonphone is the important device that realizes pressure sensitivity of microphone calibration, it does the sinusoidal vibration of given frequency and amplitude by exciting bank driven plunger, in cavity, form the sound field that can determine acoustic pressure, can determine its sound pressure sensitivity with the open circuit voltage contrast of microphone.When calibration, microphone front end inserts cavity, the front side of vibrating diaphragm contacts with the sound field in cavity, vibrating diaphragm back cavity with external environment UNICOM, in order to reduce the impact of external environment fluctuation (as air pressure and variations in temperature) on microphone calibration result, need cavity also and external environment UNICOM balance static pressure between the two, this is realized by the gap between piston and cavity.But gap between piston and cavity is one of difficult point of pistonphone design, main cause is: 1) if gap is too small, in reciprocating motion of the pistons process, be easy to produce friction between cavity, thereby produce the displacement wave distortion (not being desirable sine wave) of frictional noise and piston output, and then cause sound pressure signal also to produce distortion; 2) if excesssive gap, the gap between piston and cavity has formed the circulation passage of gaseous medium, will cause the leakage of acoustic pressure in cavity, thereby produces acoustic pressure leakage errors, and the operating frequency of pistonphone is lower, leakage errors is larger.
Utility model content
There is the displacement waveform of piston output low distortion and reduce the shortcoming that two indexs of leakage of acoustic pressure in cavity are kept in check mutually in order to overcome existing pistonphone structure, that is: under attainable assembly precision prerequisite, if the acoustic pressure that will further reduce in cavity is leaked, must reduce the gap between piston and cavity, or increase extra sealing device, the friction that this is easy to increase in piston movement and between cavity, is difficult to guarantee the displacement waveform of piston output low distortion; If or to reduce the displacement waveform distortion that piston is exported, and must increase the gap between piston and cavity, cause the leakage of acoustic pressure in cavity to increase.The utility model provides a kind of can not only reduce the friction between piston and cavity but also reduce the pistonphone of the acoustic pressure leakage in cavity and the installation adjusting method of this pistonphone.
A pistonphone with clearance sealing structure, comprises cavity, for the piston that is connected with the driver part of exciting device and the bracing or strutting arrangement of holding cavity; It is characterized in that: between cavity and piston, be provided with guide, outer surface and the cavity inner wall of guide are tightly connected, the inner surface of guide and piston form matched in clearance, and guide and cavity are coaxial; The outer surface of described guide offers annular gas tank, is provided with the connection pore that is communicated with annular gas tank and guide inner cylinder face in guide, is communicated with pore and points to guide axis, and cavity is provided with gas source interface, and gas source interface is communicated with annular gas tank.
Further, connection pore on same circumference forms a pore group, and is communicated with pore and is uniformly distributed in circumference, and the quantity of pore group is arranged at least two, and is uniformly distributed vertically in annular gas tank; The middle cross section of annular gas tank overlaps with the middle cross section of guide; Be communicated with pore setting like this can guarantee high pressure gas to the holding power of piston along the axis of the piston to be radially uniformly distributed.
Further, described piston comprises flange and the columniform piston body that can be connected with the driver part of exciting device, piston body hollow; One end sealing that piston body is positioned at cavity forms sounding end face, the other end opening of piston body, and flange is the outward extending ring limit of openend along piston body; Piston body hollow makes piston mass light, is easy to obtain higher piston movement acceleration.
Further, described bracing or strutting arrangement comprises base, adjustable sizing block, well floor and cavity bearing; The two ends of cavity are respectively equipped with cavity bearing, and cavity is provided with annular mounting groove; Cavity bearing comprises top cover and undersetting, and top cover and undersetting surround the installing hole coordinating with annular mounting groove, and top cover and undersetting are fixed, and cavity lock onto in installing hole; Base, adjustable sizing block, well floor are all positioned at the front side of exciting device, place with respect to driver part axis place vertical guide is symmetrical; Well floor is positioned on base by adjustable sizing block holding; The upper and lower surface of well floor is plane;
Undersetting both sides are respectively equipped with outward extending boss, each boss is all furnished with briquetting, briquetting can be pushed down boss in one end, the other end is adjacent to well floor, is equipped with fastening bolt on briquetting, and well floor is provided with T-shaped groove, the head of fastening bolt is positioned at T-shaped groove, the afterbody of fastening bolt is connected with wing nut, can be by wing nut by fastening to boss and well floor, and then fixing undersetting.
The utility model, by guide being set between cavity and piston, passes into high pressure gas in guide, makes to form between piston and guide uniform air film, thereby realizes piston and guide automatic centering.Utilize the suspension effect of air film to guarantee that the accuracy of piston and cavity centering is high, and then can select as far as possible little piston and guide matched in clearance, not only guaranteed that piston does not contact but also reduce the leakage of the interior acoustic pressure of cavity with guide.
The level and the height that regulate well floor by adjusting the height of adjustable sizing block, make cavity horizontal positioned, makes the axis of cavity and exciting device driver part in same level; Utilize gauge block to guarantee the equilbrium position of piston in cavity, thereby can accurately obtain the dischargeable capacity in cavity; By adjusting the position of cavity bearing, be adjacent to piston flange and driver part, realize driver part, piston and cavity coaxial, and relative position between driver part, piston and cavity is determined.
The utility model utilization forms high pressure air film and realizes the automatic centering of piston and guide between guide and piston, thereby can select as far as possible little piston and guide matched in clearance, can either reduce the leakage of acoustic pressure in cavity, reduces acoustic pressure leakage errors; Can guarantee again the relative guide motion of piston time, be accurately positioned at guide central authorities, do not produce friction, reduce the displacement waveform distortion of piston output.
Accompanying drawing explanation
Fig. 1 is cutaway view of the present utility model.
Fig. 2 is the schematic diagram of cavity.
Fig. 3 is the schematic diagram of guide.
Fig. 4 is decomposing schematic representation of the present utility model.
Fig. 5 is the partial sectional view that briquetting is connected with base plate.
Embodiment
As shown in Figure 1, 2, a kind of pistonphone with clearance sealing structure, comprises cavity 4, for the piston 1 that is connected with the driver part 22 of exciting device and the bracing or strutting arrangement of holding cavity 4; Between cavity 4 and piston 1, be provided with guide 3, the outer surface of guide 3 is connected with cavity 4 inner wall sealings, and the inner surface of guide 3 and piston 1 form matched in clearance, and guide 3 and cavity 4 are coaxial; The outer surface of described guide 3 offers annular gas tank 10, in guide 3, be provided with the connection pore 11 that is communicated with annular gas tank 10 and guide 3 inner cylinder faces, be communicated with pore 11 and point to guide 3 axis, cavity 4 is provided with gas source interface 13, and gas source interface 13 is communicated with annular gas tank 10.
As shown in Figure 3, the connection pore 11 on same circumference forms a pore group, and is communicated with pore 11 and is uniformly distributed in circumference, and the quantity of pore group is arranged at least two, and is uniformly distributed vertically in annular gas tank 10; The middle cross section of annular gas tank 10 overlaps with the middle cross section of guide 3; Be communicated with pore 11 setting like this and can guarantee that high pressure gas axially and is radially uniformly distributed along piston 1 the holding power of piston 1.
Described piston 1 comprises flange and the columniform piston body that can be connected with the driver part of exciting device 22, piston body hollow; One end sealing that piston body is positioned at cavity 4 forms sounding end face, the other end opening of piston body, and flange is the outward extending ring limit of openend along piston body; Piston body hollow makes the quality of piston 1 light, is easy to obtain higher piston 1 acceleration of motion.
As shown in Fig. 1,4, bracing or strutting arrangement comprises base 9, adjustable sizing block 8, well floor 7 and cavity bearing 5; The two ends of cavity 4 are respectively equipped with cavity bearing 5, and cavity 4 is provided with annular mounting groove 14; Cavity bearing 5 comprises top cover 15 and undersetting 16, and top cover 15 and undersetting 16 surround the installing hole coordinating with annular mounting groove 14, and top cover 15 is fixedly connected with cavity 4 is lock onto in installing hole with undersetting 16; Base 9, adjustable sizing block 8, well floor 7 are all positioned at the front side of exciting device, with respect to symmetrical placement of driver part 22 axis place vertical guides; Well floor 7 is positioned on base 9 by adjustable sizing block 8 holdings; The upper and lower surface of well floor 7 is plane.
As shown in Figure 4,5, undersetting 16 both sides are respectively equipped with outward extending boss 18, each boss 18 is all furnished with briquetting 6, and briquetting 6 can be pushed down boss 18 in one end, and the other end is adjacent to well floor 7, on briquetting 6, be equipped with fastening bolt 21, well floor 7 is provided with T-shaped groove 19, and the head of fastening bolt 21 is positioned at T-shaped groove 19, and the afterbody of fastening bolt 21 is connected with wing nut 20, can pass through wing nut 20 by fastening to boss 18 and well floor 7, and then fixing undersetting 16.
The utility model, by between cavity 4 and piston 1, guide 3 being set, passes into high pressure gas in guide 3, between piston 1 and guide 3, forms uniform air film, thereby realizes piston 1 and guide 3 automatic centerings.Utilize the suspension effect of air film to guarantee that piston 1 is high with the accuracy of cavity 4 centerings, and then can select as far as possible little piston 1 and guide 3 matched in clearance, not only guaranteed that piston 1 and guide 3 do not contact but also reduce the leakage of cavity 4 interior acoustic pressures.
The level and the height that regulate well floor 7 by adjusting the height of adjustable sizing block 8, make cavity 4 horizontal positioned, makes the axis of driver part 22 and cavity 4 in same level; Utilize gauge block 2 to guarantee the equilbrium position of piston 1 in cavity 4, thereby can accurately obtain the dischargeable capacity in cavity; By adjusting the position of cavity bearing 5, be adjacent to piston 1 flange and driver part 22, and adopt screw fastening, realize cavity 4, piston 1 and driver part 22 coaxial, the relative position between while driver part 22, piston 1 and cavity 4 is determined.
The utility model utilization forms high pressure air film and realizes the automatic centering of piston 1 and guide 3 between guide 3 and piston 1, thereby can select as far as possible little piston 1 and guide 3 matched in clearance, the acoustic pressure that can either reduce in cavity 4 is revealed, and reduces acoustic pressure leakage errors; Can guarantee again when the relative guide 3 of piston 1 moves to be accurately positioned at guide 3 central authorities, not produce friction, reduce the displacement waveform distortion that piston 1 is exported.
The method that pistonphone described in adjusting is installed comprises the following steps:
1), the driver part of exciting device 22 is lock onto to equilbrium position (axis of driver part 22 has been adjusted to level), then the cavity 4 with guide 3 is placed on bracing or strutting arrangement, adjust adjustable sizing block 8, make cavity 4 be horizontal positioned and with driver part 22 axis in same level;
2), in guide 3, pass into high pressure gas (for guaranteeing the unlikely rising of cavity internal gas pressure, open the end cap 26 in cavity 4 left sides), piston 1 is inserted in guide 3, piston 1 is floated by high pressure gas, air film is uniformly distributed between piston 1 and guide 3, piston 1 and cavity 4 automatic centerings;
3), between the flange of piston 1 and guide 3, put into gauge block 2, the length of gauge block 2 is known, when gauge block 2 one end are adjacent to guide 3, when the other end is adjacent to piston 1 flange, the equilbrium position of piston 1 in cavity 4 determined, thereby can accurately be obtained the dischargeable capacity in cavity 4; Adjust cavity 4 positions, make piston 1 flange and driver part 22 be adjacent to (for guaranteeing that faying face is parallel to each other, can finely tune adjustable sizing block 8), driver part, piston and cavity are coaxial; Piston 1 and driver part 22 use screws are linked together, tighten wing nut 20 cavity 4 is tightened together with well floor 7, the position between driver part 22, piston 1, cavity 4 is determined like this;
4), remove gauge block 2, close high-pressure air source.Now driver part 22, piston 1 and cavity 4 are coaxial, because driver part 22, piston 1 and guide 3 are axially symmetric structure, and direction of excitation and driver part 22 axis coaxles, while having realized piston 1 reciprocating motion, be positioned at guide 3 central authorities, and do not contact.
In step 4), check that in piston 1 motion, whether producing with guide 3 method rubbing or collide is: touch piston 1, if piston 1 can be free to slide in guide 3, piston 1 is good with guide 3 centerings, adjustment process is installed and finishes; If there is card or stuck in piston 1 motion, repeating step 1) ~ 4), until that piston 1 moves is smooth and easy.
The utility model, by adjusting the height of adjustable sizing block 8, makes the axis of cavity 4 and driver part 22 in same level; Utilize gauge block 2 to guarantee the equilbrium position of piston 1 in cavity 4, thereby can accurately obtain the dischargeable capacity in cavity 4; By adjusting cavity 4 positions, realize cavity 4, piston 1 and driver part 22 coaxial, and finally determine the relative position between driver part 22, piston 1 and cavity 4.
By this method of adjustment, utilize the even high pressure air film forming between piston 1 and guide 3 to realize the automatic centering of piston 1 and guide 3, and then can select as far as possible little piston 1 and guide 3 matched in clearance, and can either reduce the leakage of cavity 4 interior acoustic pressures, reduce acoustic pressure leakage errors; Can guarantee that again piston 1 is positioned at central authorities in the time that guide 3 moves relatively, and not rub, reduce the displacement waveform distortion that piston 1 is exported.
Content described in this specification embodiment is only enumerating of way of realization to utility model design; protection range of the present utility model should not be regarded as only limiting to the concrete form that embodiment states, protection range of the present utility model also and conceive the equivalent technologies means that can expect according to the utility model in those skilled in the art.
Claims (4)
1. a pistonphone with clearance sealing structure, comprises cavity, for the piston that is connected with the driver part of exciting device and the bracing or strutting arrangement of holding cavity; It is characterized in that: between cavity and piston, be provided with guide, outer surface and the cavity inner wall of guide are tightly connected, the inner surface of guide and piston form matched in clearance, and guide and cavity are coaxial; The outer surface of described guide offers annular gas tank, is provided with the connection pore that is communicated with annular gas tank and guide inner cylinder face in guide, is communicated with pore and points to guide axis, and cavity is provided with gas source interface, and gas source interface is communicated with annular gas tank.
2. the pistonphone with clearance sealing structure as claimed in claim 1, it is characterized in that: the connection pore on same circumference forms a pore group, and be communicated with pore and be uniformly distributed in circumference, the quantity of pore group is at least two rows, and is uniformly distributed vertically in annular gas tank; The middle cross section of annular gas tank overlaps with the middle cross section of guide.
3. the pistonphone with clearance sealing structure as claimed in claim 2, is characterized in that: described piston comprises flange and the columniform piston body that can be connected with the driver part of exciting device, piston body hollow; One end sealing that piston body is positioned at cavity forms sounding end face, the other end opening of piston body, and flange is the outward extending ring limit of openend along piston body.
4. the pistonphone with clearance sealing structure as claimed in claim 3, is characterized in that: described bracing or strutting arrangement comprises base, adjustable sizing block, well floor and cavity bearing; The two ends of cavity are respectively equipped with cavity bearing, and cavity is provided with annular mounting groove; Cavity bearing comprises top cover and undersetting, and top cover and undersetting surround the installing hole coordinating with annular mounting groove, and top cover and undersetting are fixed, and cavity lock onto in installing hole; Base, adjustable sizing block, well floor are all positioned at the front side of exciting device, place with respect to driver part axis place vertical guide is symmetrical; Well floor is positioned on base by adjustable sizing block holding; The upper and lower surface of well floor is plane; Undersetting both sides are respectively equipped with outward extending boss, each boss is all furnished with briquetting, boss is pushed down in briquetting one end, the other end is adjacent to well floor, on briquetting, be equipped with fastening bolt, well floor is provided with T-shaped groove, and the head of fastening bolt is positioned at T-shaped groove, and the afterbody of fastening bolt is connected with wing nut.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320794565.2U CN203596919U (en) | 2013-12-04 | 2013-12-04 | Pistonphone with gap seal structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320794565.2U CN203596919U (en) | 2013-12-04 | 2013-12-04 | Pistonphone with gap seal structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203596919U true CN203596919U (en) | 2014-05-14 |
Family
ID=50677773
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320794565.2U Withdrawn - After Issue CN203596919U (en) | 2013-12-04 | 2013-12-04 | Pistonphone with gap seal structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203596919U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103702272A (en) * | 2013-12-04 | 2014-04-02 | 浙江大学 | Pistonphone with gap sealing structure and adjusting method thereof |
-
2013
- 2013-12-04 CN CN201320794565.2U patent/CN203596919U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103702272A (en) * | 2013-12-04 | 2014-04-02 | 浙江大学 | Pistonphone with gap sealing structure and adjusting method thereof |
| CN103702272B (en) * | 2013-12-04 | 2017-04-12 | 浙江大学 | Pistonphone with gap sealing structure and adjusting method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20140514 Effective date of abandoning: 20170412 |