CN113203517A - Air pressure detection method - Google Patents
Air pressure detection method Download PDFInfo
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- CN113203517A CN113203517A CN202110457738.0A CN202110457738A CN113203517A CN 113203517 A CN113203517 A CN 113203517A CN 202110457738 A CN202110457738 A CN 202110457738A CN 113203517 A CN113203517 A CN 113203517A
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- air pressure
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L11/00—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L13/00—Devices or apparatus for measuring differences of two or more fluid pressure values
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
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Abstract
The invention discloses an air pressure detection method, which is used for detecting air pressures in two different spaces and is realized by an air pressure detection device, wherein the air pressure detection device comprises a shell, an air pressure sensor and an air pressure switching mechanism, the air pressure sensor is arranged in the air pressure switching mechanism, the air pressure switching mechanism is arranged in the shell, and the air pressure detection method comprises the steps of air passage communication, air pressure switching, pressure detection and the like. The air pressure detection method comprises the steps of air path communication, air pressure switching, pressure detection and the like, and the detection process is simple and effective; the pressure switching mechanism is used for switching gas entering the pressure detection device, the pressure sensor only detects a pressure value and is not used for switching pressure, the pressure switching mechanism can realize a pressure detection function only by using a common high-sensitivity pressure sensor in a matching way, and zero calibration can be carried out in real time when the pressure difference is calculated, so that the pressure difference value can be calculated more accurately; and a special differential pressure sensor is not needed, so that the cost is low.
Description
Technical Field
The invention relates to the field of pressure detection methods, in particular to an air pressure detection method.
Background
Pressure and air pressure sensors are widely applied to the fields of automobile manufacturing, medical equipment, industrial production and the like.
The existing differential pressure detection generally uses a differential pressure air pressure sensor, and a micro differential pressure air pressure sensor is also one of the sensors. The micro differential pressure air pressure sensor mostly adopts an imported silicon piezoresistive pressure air pressure sensor chip, and is matched with a novel digital compensation amplifying circuit with a microprocessor. The device is commonly used for detecting the pressure of a ship cabin, detecting the negative pressure of a boiler hearth, an air conditioning purification system, measuring the flow velocity and the flow rate of a fan, industrial dedusting equipment, a purification workshop, textile machinery, equipment leakage detection and measuring the small and micro pressure of other industrial places.
The existing differential pressure detection generally needs to use a differential pressure air pressure sensor with a structure similar to that described above, however, because the differential pressure air pressure sensor generally realizes processing work such as pressure conversion through a chip carried by the differential pressure air pressure sensor, the differential pressure air pressure sensor on the market at present is high in price and high in cost.
Disclosure of Invention
The present invention is directed to a method for detecting air pressure, which can solve at least one of the above problems.
According to an aspect of the present invention, there is provided an air pressure detecting method for detecting air pressures in two different spaces, the air pressure detecting method being implemented by an air pressure detecting device, the air pressure detecting device including a housing, an air pressure sensor, and an air pressure switching mechanism, the air pressure sensor being disposed in the air pressure switching mechanism, the air pressure switching mechanism being disposed in the housing, the air pressure detecting method including the steps of:
s1, air passage communication: installing an air pressure detection device in one of the two spaces, and communicating the air pressure detection device with the other space through a connecting pipe;
s2, air pressure switching: switching two air pressures entering two spaces of the air pressure detection device through an air pressure switching mechanism;
s3, pressure detection: detecting air pressure through an air pressure sensor;
therefore, the invention provides a brand-new air pressure detection method which is realized by the steps of air passage communication, air pressure switching and pressure detection, and the whole detection process is simple and effective. The detection method of the invention is provided with a special air pressure switching mechanism for switching the air entering the air pressure detection device, the air pressure sensor only detects the air pressure value and is not used for switching the pressure, the air pressure switching mechanism only needs to be matched with the common high-sensitivity air pressure sensor to realize the pressure detection function, and the zero calibration can be carried out in real time when the pressure difference is calculated, so that the more accurate calculation of the pressure difference value is realized, the special pressure difference sensor is not needed, and the cost is greatly reduced.
In some embodiments, the housing comprises a mounting plate, the air pressure switching mechanism comprises a first housing, a second housing, a driving portion and a movable portion, the first housing, the second housing and the air pressure sensor are mounted on the mounting plate, the first housing is provided with a first cavity, the second housing is provided with a second cavity, the second housing is mounted in the first cavity, the driving portion and the movable portion are mounted in the second cavity, the movable portion is tightly attached to the second housing, the air pressure sensor is located in a space formed by the movable portion, the mounting plate and the second housing, a first opening communicated with the first cavity is formed in the outer wall of the first housing, a second opening and a third opening communicated with the second cavity are formed in the outer wall of the second housing, the second opening and the third opening are different in height and are respectively located at two sides of the second housing, the second opening is located at the same side as the first opening, the driving portion is matched with the movable portion, the movable part can shield the second opening or shield the third opening under the driving of the driving part.
Therefore, the working principle of the air pressure switching mechanism is as follows: the air pressure switching mechanism is used for switching air flowing into a space formed by the piston block and the second shell, the air pressure sensor is used for detecting pressure and calculating pressure difference in a matched mode, real-time monitoring of the pressure difference value is further achieved, accurate data support is provided for subsequent control, and more importantly, the air pressure switching process is automatically carried out, the structure is simple and compact, and zero calibration efficiency is high.
In some embodiments, a partition plate is arranged in the first shell, the partition plate is in limit fit with the second shell and can divide the first cavity into two parts to form a left cavity communicated with the second opening and a right cavity communicated with the third opening, an air inlet nozzle communicated with the right cavity is arranged at the upper end of the first shell, the upper end of the air inlet nozzle extends out of the shell, and the connecting pipe is detachably sleeved on the periphery of the air inlet nozzle. Therefore, switching and detection of different pressures inside and outside the first cavity are facilitated, and air pressure data used for calculating the pressure difference are obtained.
In some embodiments, the outer edge of the second housing is in close proximity to the baffle. Thus, air leakage can be avoided.
In some embodiments, a limiting block is arranged in the first shell, the limiting block is positioned at the top of the first cavity and is in limiting fit with the second shell, and the outer edge of the second shell is tightly attached to the limiting block. Therefore, the second shell can be limited and fixed.
In some embodiments, the driving part includes a coil mounted to the second housing and a permanent magnet nested within the coil and cooperating with the movable part. From this, the structure of drive division is similar with the structure of voice coil motor, and its theory of operation is that voice coil motor is similar, forms magnetic force through circular telegram coil and permanent magnet, promotes the activity of movable part, accomplishes the drive. The voice coil motor is a direct drive motor in a special form, and has the characteristics of simple structure, small volume, high speed, high acceleration response speed and the like.
In some embodiments, the movable portion includes fixed column and piston piece, and the piston piece suit is in the periphery of fixed column and the outward flange and the second casing closely laminate, and air pressure sensor is located the space that piston piece and second casing formed, and under the effect of permanent magnet, the piston piece can shelter from the second trompil or shelter from the third trompil.
In some embodiments, the air pressure switching mechanism further includes an isolation buffer disposed at an end of the fixing post away from the piston block. From this, the isolation bolster can avoid fixed column and other object direct contact when installing, plays buffering and isolation effect, increase of service life.
In some embodiments, the isolation buffer is a spring, the isolation buffer is sleeved on the periphery of the fixed column, and the upper end of the isolation buffer is abutted to the piston block. Therefore, the spring is low in cost and can achieve the effects of isolation, buffering and resetting.
In some embodiments, the piston block defines a plurality of vent holes for the passage of gas therethrough. Therefore, the gas flowing into the first cavity can flow into a space formed by the piston block and the second shell through the vent hole, and detection of the air pressure sensor is facilitated.
In some embodiments, the mounting board is a circuit board. Therefore, other electronic components can be conveniently integrated on the mounting plate to form the complete residual pressure detector.
In some embodiments, the thickness of the piston block is greater than the width of the second and third openings. Therefore, the second opening or the third opening can be sealed, and only one side of gas can enter.
The invention has the beneficial effects that:
the invention provides a brand-new air pressure detection method which is realized by the steps of air passage communication, air pressure switching, pressure detection and differential pressure calculation, and the whole detection process is simple and effective. The detection method of the invention is provided with a special air pressure switching mechanism for switching the air entering the air pressure detection device, the air pressure sensor only detects the air pressure value and is not used for switching the pressure, the air pressure switching mechanism only needs to be matched with the common high-sensitivity air pressure sensor to realize the pressure detection function, and the zero calibration can be carried out in real time when the pressure difference is calculated, so that the more accurate calculation of the pressure difference value is realized, the special pressure difference sensor is not needed, and the cost is greatly reduced.
The air pressure detection method can respectively collect the air pressure in the two spaces to be detected, and is convenient for subsequent differential pressure calculation.
Drawings
FIG. 1 is a flow chart of a method for detecting air pressure according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an application of an air pressure detecting device according to an embodiment of the present invention;
fig. 3 is a schematic perspective view of the air pressure detecting device of fig. 2 according to an embodiment;
FIG. 4 is an exploded view of the air pressure detecting device shown in FIG. 3;
FIG. 5 is a schematic top view of the air pressure detecting device shown in FIG. 3;
FIG. 6 is a schematic cross-sectional view along the line A-A of the air pressure detecting device shown in FIG. 5;
fig. 7 is a schematic perspective view of a first housing of the air pressure detecting device shown in fig. 3;
fig. 8 is a schematic perspective view of a second housing of the air pressure detecting device shown in fig. 3;
FIG. 9 is a schematic perspective view of a portion of the air pressure detecting device shown in FIG. 3;
reference numerals in FIGS. 1 to 9: 1-a housing; 2-air pressure detection method; 3-connecting pipe; 21-mounting a plate; 22-a barometric pressure sensor; 23-a pneumatic switching mechanism; 231-a first housing; 232-a second housing; 233-a driving part; 234-a movable part; 235-a spring; 236-a separator; 237-a stop block; 2311-a first cavity; 2312-first opening; 2313-air inlet nozzle; 2321-a second cavity; 2322-second opening; 2323-third opening; 2331-coil; 2332-permanent magnet; 2341-fixed column; 2342-piston block; 2311 a-left cavity; 2311 b-right cavity; 2342 a-vent hole.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Fig. 1 to 9 schematically show an air pressure detecting method according to an embodiment of the present invention.
As shown in fig. 1 and 2, the air pressure detecting method is used to detect air pressures of two different spaces. The air pressure detection method is realized by the air pressure detection device 2. The air pressure detecting device 2 includes a housing 21, an air pressure sensor 22, and an air pressure switching mechanism 23. The air pressure sensor 22 is provided in the air pressure switching mechanism 23, and the air pressure switching mechanism 23 is provided in the housing 21.
The specific air pressure detection method comprises the following steps:
s1, air passage communication: the air pressure detection device 2 is arranged in one of the two spaces, and the air pressure detection device 2 is communicated with the other space through a connecting pipe 1;
s2, air pressure switching: the two air pressures entering the two spaces of the air pressure detection device 2 are switched by the air pressure switching mechanism 23;
s3, pressure detection: the air pressure is detected by the air pressure sensor 22;
the air pressure switching mechanism 23 of the present embodiment switches the air flowing into the space of the air pressure detecting device 2, and the air pressure sensor 22 detects the pressure of the air.
As shown in fig. 1 to 9, the housing 21 includes a mounting plate 211, and the mounting plate 211 may be a PCB disposed in the housing 21. Therefore, other electronic components can be conveniently integrated on the mounting plate 211 to form a complete air pressure detection device.
The air pressure switching mechanism 23 of the present embodiment includes a first housing 231, a second housing 232, a driving unit 233, and a movable unit 234. The first housing 231, the second housing 232, and the air pressure sensor 22 are mounted on the mounting plate 211. The first housing 231 defines a first cavity 2311, and the second housing 232 defines a second cavity 2321. The second housing 232 is installed in the first cavity 2311, and the driving part 233 and the movable part 234 are installed in the second cavity 2321. The outer edge of the movable portion 234 is closely fitted to the second housing 232. The air pressure sensor 22 is located in a space formed by the movable portion 234 and the second housing 232. The outer wall of the first housing 231 is provided with a first opening 2312 communicated with the first cavity 2311. The outer wall of the second housing 232 defines a second opening 2322 and a third opening 2323, which are communicated with the second cavity 2321. The second opening 2322 and the third opening 2323 have different heights and are respectively located at two sides of the second housing 232. The second aperture 2322 is on the same side as the first aperture 2312. The driving part 233 is coupled with the movable part 234 for driving the movable part 234 to move along the inner wall of the second housing 232. The movable portion 234 can block the second opening 2322 or the third opening 2323 by the driving of the driving portion 233.
The driving unit 233 according to this embodiment includes a coil 2331 and a permanent magnet 2332, the coil 2331 is mounted to the second housing 232, and the permanent magnet 2332 is fitted around the coil 2331 and engaged with the movable unit 234. Therefore, the driving part 233 has a structure similar to that of a voice coil motor, and operates in a principle similar to that of a voice coil motor, and the movable part 234 is pushed to move by forming a magnetic force by energizing the coil 2331 and the permanent magnet 2332, thereby completing driving. The voice coil motor is a direct drive motor in a special form, and has the characteristics of simple structure, small volume, high speed, high acceleration response speed and the like.
The movable portion 234 of the present embodiment includes a fixed post 2341 and a piston block 2342. The permanent magnet 2332 of the driving part 233 is matched with the fixed column 234, and the piston block 2342 is sleeved on the periphery of the fixed column 234 and the outer edge of the piston block 2342 is tightly attached to the second shell 232. The air pressure sensor 22 is located in the space formed by the piston block 2342 and the second housing 232. The piston block 2342 may be raised and lowered to block the second opening 2322 or block the third opening 2323 by the driving of the driving part 233.
The first and second housings 231 and 232 of the present embodiment have cylindrical main body shapes, and the piston block 2342 has a disk shape.
The piston block 2342 is provided with a plurality of vent holes 2342a through which air passes. A plurality of vent holes 2342a are distributed in a circumferential array along the center of the piston block 2342. Thus, the gas flowing into the first cavity 2311 can flow into the space formed by the piston block 2342 and the second housing 232 through the vent holes 2342a, so as to facilitate the detection of the gas pressure sensor 22.
The pneumatic switching mechanism 23 of this embodiment further includes an isolating bumper 235, and the isolating bumper 235 is disposed at one end of the fixed column 2341 far from the piston block 2342. From this, fixed column 2341 and other object direct contact play buffering and isolation effect, increase of service life when keeping apart bolster 235 can avoid the installation.
The isolation bumper 235 of this embodiment is a spring. Isolation bumper 235 suit is in the periphery of fixed column 2341, and the upper end and the piston piece 2342 of isolation bumper 235 offset, and the lower extreme offsets with mounting panel 211. Therefore, the spring is low in cost and can achieve the effects of isolation, buffering and resetting.
The thickness of the piston block 2342 is greater than the width of the second and third openings 2322 and 2323. This ensures that the second opening 2322 or the third opening 2323 is sealed, and that only one gas can enter.
A partition 236 is disposed in the first housing 231, the partition 236 is in limit fit with the second housing 232 and can divide the first cavity 2311 into two parts to form a left cavity 2311a communicated with the second opening 2322 and a right cavity 2311b communicated with the third opening 2323. The upper end of the first housing 231 is provided with an intake nozzle 2313 communicating with the right cavity 2311 b. The upper end of the air inlet nozzle 2313 extends out of the shell 21, and the connecting pipe 1 is detachably sleeved on the periphery of the air inlet nozzle 2313. Therefore, switching and detection of different pressures inside and outside the first cavity 2311 are facilitated, and air pressure data used for calculating the pressure difference are obtained.
The outer edge of the second housing 232 is in close contact with the partition 236. Thus, air leakage can be avoided.
A limit block 237 is arranged in the first housing 231, the limit block 237 is located at the top of the first cavity 2311 and is in limit fit with the second housing 232, and the outer edge of the second housing 232 is tightly attached to the limit block 237. Therefore, the limiting block 237 can limit and fix the second housing 232.
The invention provides an air pressure detection device 2 with a brand new structure, which has the working principle that: the air pressure switching mechanism 23 is used for switching air flowing into a space formed by the piston block 2342 and the second shell 232, the air pressure sensor 22 is used for collecting air pressure changes, real-time monitoring of pressure difference and the like is further achieved, accurate data support is provided for subsequent control, and more importantly, the air pressure switching process is automatically carried out, the structure is simple and compact, and the working efficiency is high.
As shown in fig. 2, in an actual use process, the air pressure detecting device 2 of the present embodiment is installed on an outer wall of a front room or a walkway in a wall-mounted manner, and a galvanized steel pipe is used to penetrate through a wall body to communicate with a corridor or a staircase, one end of the connecting pipe 1 is connected to the galvanized steel pipe, and the other end is sleeved on the air inlet 2313 of the air pressure switching mechanism 23. Under normal conditions, the pressure intensity range of the corridor or the staircase is 40-50 Pa, and the pressure intensity range of the front room or the walkway is 25-30 Pa. The air pressure switching mechanism 23 of this embodiment is used to switch the air flowing into the space formed by the piston block 2342 and the second housing 232, for example, when the piston block 2342 blocks the second opening 2322, the pressure of the air input from the connection pipe 1 detected by the air pressure sensor 22 is the pressure value of the corridor or the staircase; when the piston block 2342 blocks the third opening 2323, the second opening 2322 communicates with the first opening 2312, and the air pressure sensor 22 detects the air pressure at the local place where the air pressure detection device 2 is installed, i.e., the pressure value of the front chamber or the walkway.
The air pressure detection method is based on the air pressure detection device 2, the air pressure sensor 22 can detect the air pressure value, and the connecting pipe 1 and the like are accessories and can be matched with the air pressure detection device 2 for use; be connected with air pressure detection device 2 through connecting pipe 1, gather the air pressure of wall body both sides respectively, and through treater such as MCU with 2 electric connection of air pressure detection device, real-time zero calibration can be carried out, accomplish more accurate calculation pressure differential value, then with the pressure differential value of evacuation passageway residual pressure, pressure state and fault information etc. feedback to controller, the controller sends alarm signal and record to trouble such as superpressure according to the settlement parameter, the follow-up corresponding equipment of being convenient for carries out corresponding processing. For example, when the residual pressure value of a smoke-proof staircase or a front chamber reaches an overpressure monitoring value, an alarm signal is sent out, and a controller opens a bypass valve on a blast pipe of a pressurization fan to release pressure; after the residual pressure falls back to the normal interval value, a signal is sent out, and the controller closes the bypass valve. The air pressure detection device 2 can be combined with a controller, a pressure release valve and the like to form an excess pressure monitoring system, so that the opening of the bypass pressure release valve is controlled to keep the excess pressure value stable within an interval value required by a specification, and the air pressure detection device has the characteristics of real-time performance, digitization, intellectualization, automatic continuous monitoring and the like.
The invention provides a brand-new air pressure detection method which is realized by steps of air passage communication, air pressure switching, pressure detection and the like, and the whole detection process is simple and effective. The detection method of the invention is provided with a special air pressure switching mechanism for switching the air entering the air pressure detection device, the air pressure sensor only detects the air pressure value and is not used for switching the pressure, the air pressure switching mechanism only needs to be matched with the common high-sensitivity air pressure sensor to realize the pressure detection function, and the zero calibration can be carried out in real time when the pressure difference is calculated, so that the more accurate calculation of the pressure difference value is realized, the special pressure difference sensor is not needed, and the cost is greatly reduced.
What has been described above are merely some embodiments of the present invention. It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the inventive concept thereof, and these changes and modifications can be made without departing from the spirit and scope of the invention.
Claims (10)
1. The air pressure detection method is used for detecting air pressures in two different spaces, and is characterized in that the air pressure detection method is realized through an air pressure detection device (2), the air pressure detection device (2) comprises a shell (21), an air pressure sensor (22) and an air pressure switching mechanism (23), the air pressure sensor (22) is arranged in the air pressure switching mechanism (23), the air pressure switching mechanism (23) is arranged in the shell (21), and the air pressure detection method comprises the following steps:
s1, air passage communication: the air pressure detection device (2) is arranged in one of the two spaces, and the air pressure detection device (2) is communicated with the other space through a connecting pipe (1);
s2, air pressure switching: two air pressures entering two spaces of the air pressure detection device (2) are switched through an air pressure switching mechanism (23);
s3, pressure detection: the air pressure is detected by an air pressure sensor (22).
2. The air pressure detection method according to claim 1, wherein the housing (21) includes a mounting plate (211), the air pressure switching mechanism (23) includes a first housing (231), a second housing (232), a driving portion (233), and a movable portion (234), the first housing (231), the second housing (232), and the air pressure sensor (22) are mounted on the mounting plate (211), the first housing (231) has a first cavity (2311), the second housing (232) has a second cavity (2321), the second housing (232) is mounted in the first cavity (2311), the driving portion (233) and the movable portion (234) are mounted in the second cavity (2321), the movable portion (234) is tightly attached to the second housing (232), and the air pressure sensor (22) is located in a space formed by the movable portion (234), the mounting plate (211), and the second housing (232), the outer wall of the first shell (231) is provided with a first opening (2312) communicated with the first cavity (2311), the outer wall of the second shell (232) is provided with a second opening (2322) and a third opening (2323) communicated with the second cavity (2321), the second opening (2322) and the third opening (2323) are different in height and are respectively located on two sides of the second shell (232), the second opening (2322) and the first opening (2312) are located on the same side, the driving part (233) is matched with the movable part (234), and under the driving of the driving part (233), the movable part (234) can shield the second opening (2322) or shield the third opening (2323).
3. The air pressure detection method according to claim 2, wherein a partition plate (236) is arranged in the first housing (231), the partition plate (236) is in limit fit with the second housing (232) and can divide the first cavity (2311) into two parts to form a left cavity (2311a) communicated with the second opening (2322) and a right cavity (2311b) communicated with the third opening (2323), an air inlet nozzle (2313) communicated with the right cavity (2311b) is arranged at the upper end of the first housing (231), the upper end of the air inlet nozzle (2313) extends out of the housing (211), and the connecting pipe (1) is detachably sleeved on the periphery of the air inlet nozzle (2313).
4. The air pressure detection method according to claim 3, wherein a limit block (237) is arranged in the first housing (231), the limit block (237) is positioned at the top of the first cavity (2311) and is in limit fit with the second housing (232), and the outer edge of the second housing (232) is tightly attached to the limit block (237).
5. The air pressure detecting method as claimed in any one of claims 1 to 4, wherein the driving part (233) comprises a coil (2331) and a permanent magnet (2332), the coil (2332) is mounted on the second housing (232), and the permanent magnet (2332) is sleeved in the coil (2331) and is matched with the movable part (234).
6. The air pressure detection method as claimed in claim 5, wherein the movable portion (234) comprises a fixed column (2341) and a piston block (2342), the piston block (2342) is sleeved on the outer periphery of the fixed column (234), the outer edge of the piston block (2342) is tightly attached to the second housing (232), the air pressure sensor (22) is located in a space formed by the piston block (2342) and the second housing (232), and under the action of the permanent magnet (2332), the piston block (2342) can shield the second opening (2322) or shield the third opening (2323).
7. The air pressure switching mechanism of claim 6, further comprising an isolation bumper (235), wherein the isolation bumper (235) is disposed at an end of the fixed post (2341) away from the piston block (2342).
8. The air pressure detection method according to claim 7, wherein the isolation buffer (235) is a spring, the isolation buffer (235) is sleeved on the outer periphery of the fixed column (2341), one end of the spring (235) abuts against the piston block (2342), and the other end of the spring abuts against the mounting plate (21).
9. The method of claim 6, wherein the piston block (2342) has a plurality of vent holes (2342 a).
10. The method of claim 6, wherein the piston block (2342) has a thickness greater than a width of the second opening (2322) and the third opening (2323).
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| CN113203517B (en) | 2022-12-13 |
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