WO2020001177A1

WO2020001177A1 - Sealed chamber having adjustable volume and control method

Info

Publication number: WO2020001177A1
Application number: PCT/CN2019/086529
Authority: WO
Inventors: 夏可瑜
Original assignee: 东莞市升微机电设备科技有限公司
Priority date: 2018-06-27
Filing date: 2019-05-13
Publication date: 2020-01-02
Also published as: CN108594915A; CN108594915B

Abstract

A sealed chamber (1) that has an adjustable volume and a control method; the sealed chamber (1) and a gas compensation device (2) are comprised, the gas compensation device (2) being disposed at one or more surfaces of the sealed chamber (1), wherein the gas compensation device (2) comprises an orifice plate (3), a pressing plate (4), a driving device (5) and an elastic film (6); the orifice plate (3) is installed on any one or more surfaces of the sealed chamber (1); the elastic film (6) is disposed on an outer side surface of the corresponding orifice plate (3) and may expand or contract relative to an inner part of the sealed chamber (1); the pressing plate (4) is disposed on an outer side surface of the corresponding elastic film (6); and the driving device (5) is in drive connection with the corresponding pressing plate (4) to drive the front and back movement of the pressing plate (4), thereby pressing the elastic film (6) to come into contact with the orifice plate (3). By means of the arrangement of the elastic film (6), when the temperature at the inner part of the sealed chamber (1) rises, the elastic film (6) expands, and when the temperature at the inner part of the sealed chamber (1) decreases, the elastic film (6) contracts, thereby changing the volume of the inner part of the sealed chamber (1) so that the internal volume of the sealed chamber (1) changes along with a change in the test temperature, effectively improving detection accuracy.

Description

Closed chamber with adjustable volume and control method

Technical field

The present invention relates to the technical field of closed chambers, and more particularly, to a closed chamber with adjustable volume and a control method thereof.

Background technique

Existing vehicles have components such as fuel tanks, tires, automotive exteriors, and automotive chassis. Volatile substances are volatile. When the concentration of volatile hazardous substances exceeds a certain range, it will cause harm to the human body. Therefore, it is necessary to collect hazardous substances in cars. Detection.

However, the volume of the existing evaporative closed chamber is mostly fixed, and the volume of the closed chamber cannot be changed according to the requirements of the test during the test. When the temperature inside the closed chamber changes, the volume of the closed chamber cannot be changed, resulting in external pollution gas due to air pressure. Poor access to the interior of the confined room affects the accuracy of the test and cannot meet the needs of detection at various temperatures.

Summary of the invention

The purpose of the present invention is to overcome the above-mentioned shortcomings in the prior art, and to provide an enclosed volume-adjustable closed chamber capable of avoiding the influence of the external environment or other uncertain factors on the test result, thereby effectively improving the detection accuracy.

In order to achieve the above object, the present invention provides a closed volume chamber with adjustable volume, including a closed chamber, and the closed chamber is provided with a gas compensation device for compensating the gas volume inside the closed chamber during a gas sampling process. The gas compensation device is disposed on one or more sides of the sealed chamber. The gas compensation device includes an orifice plate, a pressure plate, a driving device, and an elastic membrane. The orifice plate is installed on any one or more sides of the sealed chamber. The elastic membrane The pressure plate is arranged on the outer surface of the corresponding orifice plate, and can be expanded or contracted relative to the interior of the closed chamber. The pressure plate is arranged on the outer surface of the corresponding elastic membrane. The driving device is drivingly connected to the corresponding pressure plate, thereby driving the pressure plate. Back and forth movement, so that the elastic membrane is pressed to contact the orifice plate.

Preferably, the driving device is provided as a pneumatic or electric or manual driving device.

Preferably, the closed outdoor cover is provided with a temperature or humidity control jacket, and the temperature or humidity control jacket is provided with a temperature or humidity control unit.

Preferably, a temperature control unit is provided inside or outside the closed room, and a closed door is provided on the closed room.

Preferably, a stirring fan is provided in the closed room.

Preferably, an exhaust duct is connected to the closed chamber, and a vent valve is provided on the exhaust duct.

Preferably, the closed chamber is connected with an air inlet duct, and an air flow meter or / and an air inlet valve are installed on the air inlet duct.

Provided is a control method for the above-mentioned adjustable volume closed room, including the following steps:

1) Keep the closed compartment door closed, open the ventilation valve, adjust the temperature or humidity control unit of the temperature adjustment or debugging jacket, and adjust the temperature control unit inside the closed room so that the temperature inside the closed room reaches t1;

2) The driving device starts to move, drives the elastic membrane to be pressed against the orifice plate, closes the ventilation valve, and closes the ventilation valve. At this time, the volume of the closed chamber is the geometric volume of the closed chamber;

3) Reset the drive device, increase the temperature inside the closed room to t2, the air inside the closed room expands, and the elastic membrane expands. At this time, the volume of the closed room is: ((273 + t2) / (273 + t1)) * closed room Geometric volume to obtain the volume of the closed chamber at t2 temperature;

4) The temperature inside the closed chamber is raised to t3 again. At this time, the volume of the closed chamber is: ((273 + t3) / (273 + t1)) * the geometric volume of the closed chamber, thereby obtaining the volume of the closed chamber at t3 temperature.

A control method for the closed chamber with adjustable volume is further provided, including the following steps:

3) Reset the driving device, open the intake valve, and inject clean gas into the interior of the enclosed room through the intake duct and the intake flow meter. The volume of the gas is V1, the air inside the enclosed room expands, and the elastic membrane swells. The volume of hermetic chamber is V1 + the geometric volume of hermetic chamber;

4) Adjust the temperature or humidity control unit of the temperature adjustment or debugging jacket to increase or decrease the temperature inside the closed room to t2, the air inside the closed room expands or contracts, and the elastic membrane expands or contracts. At this time, the volume of the closed room is (V1 + Geometric volume of the closed chamber) * (273 + t2) / (273 + t1).

Compared with the prior art, the beneficial effects of the present invention are:

The invention has a simple structure, and includes a sealed chamber and a gas compensation device for compensating the gas volume inside the sealed chamber during a gas sampling process. The gas compensation device is arranged on one or more sides of the sealed chamber. The gas compensation device includes an orifice plate. , Pressure plate, driving device and elastic membrane, the orifice plate is installed on any one or more sides of the sealed chamber, the elastic membrane is arranged on the outer surface of the corresponding orifice plate, and can expand or contract relative to the interior of the sealed chamber. On the outer surface of the elastic membrane, the driving device is drivingly connected to the corresponding pressure plate, so as to drive the pressure plate to move forward and backward, thereby pressing the elastic film to contact the orifice plate. With the setting of the elastic film, when the temperature inside the enclosed room rises, The elastic membrane expands. When the temperature inside the enclosed room decreases, the elastic membrane shrinks, causing the internal volume of the enclosed room to change at a specific temperature, or by introducing air to the interior of the enclosed room, thereby changing the volume of the enclosed room, making the enclosed room The volume inside the room changes with the test temperature, effectively improving the accuracy of the test.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly explain the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are Some embodiments of the present invention, for those skilled in the art, can obtain other drawings according to these drawings without paying creative labor.

FIG. 1 is a schematic diagram of an overall structure of a closed volume with adjustable volume provided by the present invention; FIG.

FIG. 2 is a schematic diagram of the overall structure of another adjustable volume closed room provided by the present invention.

detailed description

In order to make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part, but not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Example one

Please refer to FIG. 1, an embodiment of the present invention provides an airtight chamber with adjustable volume, including the airtight chamber 1 and a gas compensating device 2 for compensating gas volume inside the airtight chamber during a gas sampling process. 2 is disposed on one or more sides of the closed chamber 1, wherein the gas compensation device 2 includes an orifice plate 3, a pressure plate 4, a driving device 5 and an elastic membrane 6, and the orifice plate 3 is installed on any one or more sides of the enclosed room 1, The elastic membrane 6 is arranged on the outer surface of the corresponding orifice plate 3, and can be expanded or contracted relative to the interior of the closed chamber 1. The pressure plate 4 is arranged on the outer surface of the corresponding elastic membrane 6, and the driving device 5 is drivingly connected to the corresponding pressure plate 4. Therefore, the forward and backward movement of the pressure plate 4 is driven, and the elastic film 6 is pressed to contact the orifice plate 3, and this embodiment is described in detail below with reference to the accompanying drawings.

As shown in FIG. 1, the closed chamber 1 is provided with a gas compensation device 2 for compensating the gas volume inside the closed chamber 1 during the gas sampling process. The gas compensation device 2 is installed on one or more sides of the closed chamber 1. The gas compensation device 2 includes an orifice plate 3, a pressure plate 4, a driving device 5, and an elastic membrane 6. The orifice plate 3 is installed on any one or more sides of the closed chamber 1. The elastic membrane 6 is provided on the outer side of the corresponding orifice plate 3. Can be expanded or contracted relative to the interior of the closed chamber 1, the pressure plate 4 is arranged on the outer surface of the corresponding elastic membrane 6, and the driving device 5 is drivingly connected to the corresponding pressure plate 4, so as to drive the pressure plate 4 to move forward and backward, thereby pressing The elastic membrane 6 is in contact with the orifice plate 3. With the arrangement of the elastic membrane 6, when the internal temperature of the closed chamber 1 rises, the elastic membrane 6 expands, and when the internal temperature of the closed chamber 1 decreases, the elastic membrane 6 contracts, making the closed chamber 1 The internal volume changes at a specific temperature, so as to change the volume inside the closed chamber 1, so that the internal volume of the closed chamber 1 changes with the change of the test temperature, effectively improving the detection accuracy.

In this embodiment, the driving device 5 may be configured as a pneumatic or electric or manual driving device, and may be selected according to actual conditions, which is not limited by this embodiment.

Preferably, the outer cover of the closed room 1 is provided with a temperature or humidity regulating jacket 7. The temperature or humidity regulating jacket 7 is provided with a temperature or humidity controlling unit. By setting the temperature or humidity regulating jacket 7, Effectively maintain the temperature or humidity inside the closed chamber 1, provide a standard and stable test environment for the test, and effectively ensure the accuracy of the test.

Preferably, the closed chamber 1 is provided with a closed cabin door 15, and the closed chamber 1 is provided with a temperature control unit 8 and a stirring fan 9, and the temperature inside the closed chamber 1 is controlled and adjusted by the setting of the temperature control unit 8. , Effectively guarantee the accuracy of the test, through the setting of the stirring fan 9, the gas inside the closed chamber 1 is effectively stirred uniformly, so that the gas concentration in the closed chamber is evenly stirred when the gas is replaced and sampled before detection.

In this embodiment, the sealed chamber 1 is connected to an exhaust pipe 10, and an exhaust valve 11 is provided on the exhaust pipe 10. Before detection, the polluted gas inside the sealed chamber 1 is discharged and replaced with a clean and non-polluting gas, which is effective Guarantee the accuracy of the test.

An enclosed volume with adjustable volume includes the following adjustment steps:

(1) Keep the closed compartment door 15 of the closed room 1 closed, open the ventilation valve 11, adjust the temperature or humidity control unit of the temperature or humidity jacket 7, and adjust the temperature control unit 8 inside the closed room 1 so that The temperature inside the closed chamber 1 reaches t1;

(2) The driving device 5 starts to operate, drives the elastic membrane 6 to be pressed against the orifice plate 3, and closes the ventilation valve 11. At this time, the internal volume of the closed chamber 1 is the geometric volume of the closed chamber 1.

(3) The driving device 5 is reset, and the internal temperature of the closed chamber 1 is increased to t2. The air inside the closed chamber 1 expands, and the elastic membrane 3 expands and bulges. At this time, the volume of the closed chamber 1 is: ((273 + 30) / (273+ 20)) * The geometric volume of the closed chamber, so as to obtain the volume of the closed chamber 1 at the temperature t2;

(4) The internal temperature of the closed chamber 1 is raised to t3 again. At this time, the volume of the closed chamber 1 is: ((273 + t3) / (273 + t1)) * the geometric volume of the closed chamber, thereby obtaining the closed chamber 1 at t3 temperature. The volume.

In this way, when the internal temperature of the closed chamber 1 changes from the temperature range of t1 to t3, the internal volume of the closed chamber 1 is adjusted to effectively ensure that there is no gas leakage or exchange in the closed chamber 1 during the temperature change, and the inside of the closed chamber 1 is guaranteed. Constant pressure.

When the internal temperature of hermetic chamber 1 rises, the elastic membrane expands. When the internal temperature of hermetic chamber 1 decreases, the elastic membrane 6 shrinks, thereby changing the volume inside hermetic chamber 1, so that the internal volume of hermetic chamber 1 changes with the test temperature. Change, effectively improve the accuracy of detection.

Example two

The second embodiment of the present invention provides another type of closed room with adjustable volume. The closed room 1 is connected to an air inlet duct 12, and an air inlet flow meter 13 or / and an air inlet valve 14 are installed on the air inlet duct 12. The implementation of the present invention The structure of the closed volume chamber of the second embodiment and the structure of the closed volume chamber of the first embodiment are mostly the same, and the same points are not described again.

In the present embodiment, the airtight chamber 1 is connected to an air inlet duct 12, an air inlet meter 13 or / and an air inlet valve 14 is installed on the air inlet duct 12, the driving device 5 is reset, the air inlet valve 14 is opened, and the air duct is passed through 12 and the intake air flow meter 13 introduce clean gas into the closed chamber 1, the volume of the gas is V1, the air inside the closed chamber 1 expands, and the elastic membrane 6 swells. At this time, the volume of the closed chamber 1 is V1 + the geometry of the closed chamber. volume.

In this embodiment, a closed volume with adjustable volume includes the following adjustment steps:

(1) Keep the closed door 15 of the closed room 1 closed, open the ventilation valve 11, adjust the temperature or humidity control unit of the thermostat or debug jacket 4, and adjust the temperature control unit 8 inside the closed room 1 to make the room closed The internal temperature of chamber 1 reaches t1;

(2) The driving device 5 starts to move, drives the elastic membrane 6 to be pressed against the orifice plate 3, closes the ventilation valve 11, and closes the ventilation valve 11. At this time, the internal volume of the closed chamber 1 is the geometric volume of the closed chamber 1.

(3) The driving device 5 is reset, and the intake valve 14 is opened, and the clean gas is introduced into the closed chamber 1 through the intake pipe 12 and the intake flow meter 13, and the volume of the gas is V1. The air in the closed chamber 1 expands and is elastic. The membrane 6 bulges and expands. At this time, the volume of the closed chamber 1 is V1 + the geometric volume of the closed chamber;

In this way, the internal volume of the closed chamber 1 is initially adjusted. After the inflation is completed, the internal standard volume of the closed chamber 1 is V1 + the geometric volume of the closed chamber. When the internal temperature of the closed chamber 1 rises, the elastic membrane expands. When the internal temperature of the closed chamber 1 decreases, the elastic membrane 6 shrinks, which effectively ensures that when the internal temperature of the closed chamber 1 changes, the internal pressure of the closed chamber 1 remains stable and there is no leakage of internal gas. No exchange.

In addition, in the first and second embodiments, if the influence of atmospheric pressure and humidity is taken into consideration during the detection, the change in the internal volume of the closed chamber 1 needs to add the influence factors of the atmospheric pressure and humidity change.

In summary, the present invention has a simple structure, and includes a closed chamber 1 and a gas compensation device 2 for compensating the gas volume inside the closed chamber 1 during a gas sampling process. The gas compensation device 2 is disposed on one or more sides of the closed chamber 1 In the above, the gas compensation device 2 includes an orifice plate 3, a pressure plate 4, a driving device 5 and an elastic membrane 6. The orifice plate 3 is installed on any one or more sides of the closed chamber 1. The elastic membrane 6 is provided on the corresponding orifice plate 3. Can be expanded or contracted relative to the interior of the closed chamber 1, the pressure plate 4 is arranged on the outer surface of the corresponding elastic membrane 6, and the driving device 5 is drivingly connected to the corresponding pressure plate 4, thereby driving the pressure plate 4 to move forward and backward to The compressed elastic film 6 is in contact with the orifice plate 3. With the arrangement of the elastic film 6, when the temperature inside the closed chamber 1 rises, the elastic film 6 expands. When the temperature inside the closed chamber 1 drops, the elastic film 6 shrinks, making it sealed. The internal volume of the chamber 1 changes at a specific temperature, or the internal volume of the closed chamber 1 is changed by introducing air into the closed chamber 1, so that the internal volume of the closed chamber 1 changes with the change of the test temperature, which is effective. Improve detection accuracy.

The above embodiment is a preferred embodiment of the present invention, but the embodiment of the present invention is not limited by the above embodiment. Any other changes, modifications, substitutions, combinations, and modifications made without departing from the spirit and principle of the present invention, Simplified, all should be equivalent replacement methods, and all are included in the protection scope of the present invention.

Claims

An airtight chamber with adjustable volume includes a airtight chamber (1), which is characterized in that: the airtight chamber (1) is provided with gas compensation for gas volume compensation inside the airtight chamber (1) during a gas sampling process Device (2), said gas compensation device (2) is arranged on one or more sides of the closed chamber (1), said gas compensation device (2) comprises an orifice plate (3), a pressure plate (4), and a driving device (5) ) And an elastic membrane (6), the orifice plate (3) is installed on any one or more sides of the closed chamber (1), and the elastic membrane (6) is arranged on the outer side of the corresponding orifice plate (3) And can be expanded or contracted relatively inside the closed chamber (1), the pressure plate (4) is arranged on the outer surface of the corresponding elastic membrane (6), and the driving device (5) is drivingly connected with the corresponding pressure plate (4) Thus, the pressing plate (4) is driven to move forward and backward, thereby pressing the elastic film (6) to contact the orifice plate (3).
The closed volume room with adjustable volume according to claim 1, characterized in that the driving device (5) is provided as a pneumatic or electric or manual driving device.
A closed volume room with adjustable volume according to claim 1, characterized in that the outer cover of the closed room (1) is provided with a temperature or humidity regulating jacket (7), and the temperature or humidity regulating jacket (7) A temperature or humidity control unit is provided.
A closed volume room with adjustable volume according to claim 1, characterized in that: a temperature control unit (8) is provided inside or outside the closed room (1), and a closed door is provided on the closed room (15).
A closed volume chamber with adjustable volume according to claim 1, characterized in that: a stirring fan (9) is arranged in the closed chamber (1).
A closed volume chamber with adjustable volume according to claim 1, characterized in that: the closed chamber (1) is connected with an exhaust pipe (10), and an exhaust valve is provided on the exhaust pipe (10) (11).
An enclosed volume chamber with adjustable volume according to claim 1, characterized in that the enclosed chamber (1) is connected with an air intake duct (12), and the air intake duct (12) is installed with an intake air flow rate Meter (13) or / and intake valve (14).
A control method for an adjustable volume evaporation hermetic chamber according to claim 1, comprising the following steps:

1) Keep the closed compartment door closed, open the ventilation valve, adjust the temperature or humidity control unit of the temperature adjustment or debugging jacket, and adjust the temperature control unit inside the closed room so that the temperature inside the closed room reaches t1;

2) The driving device starts to move, drives the elastic membrane to be pressed against the orifice plate, closes the ventilation valve, and closes the ventilation valve 11. At this time, the internal volume of the closed chamber 1 is the geometric volume of the closed chamber 1;

3) The driving device 5 is reset, and the internal temperature of the closed chamber 1 is increased to t2. The air in the closed chamber 1 is expanded, and the elastic membrane 3 is expanded. At this time, the volume of the closed chamber 1 is: ((273 + t2) / (273 + t1) )) * The geometric volume of the closed chamber, so as to obtain the volume of the closed chamber 1 at the temperature t2;

4) The temperature inside the closed chamber is raised to t3 again. At this time, the volume of the closed chamber is: ((273 + t3) / (273 + t1)) * the geometric volume of the closed chamber, thereby obtaining the volume of the closed chamber at t3 temperature.
A control method for an adjustable volume evaporation hermetic chamber according to claim 7, characterized in that it comprises the following steps:

1) Keep the closed compartment door closed, open the ventilation valve, adjust the temperature or humidity control unit of the temperature adjustment or debugging jacket, and adjust the temperature control unit inside the closed room so that the temperature inside the closed room reaches t1;

2) The driving device starts to move, drives the elastic membrane to be pressed against the orifice plate, closes the ventilation valve, and closes the ventilation valve 11. At this time, the internal volume of the closed chamber 1 is the geometric volume of the closed chamber 1;

3) Reset the driving device, open the intake valve, and inject clean gas into the interior of the enclosed room through the intake duct and the intake flow meter. The volume of the gas is V1, the air inside the enclosed room expands, and the elastic membrane swells. The volume of hermetic chamber is V1 + the geometric volume of hermetic chamber;

4) Adjust the temperature or humidity control unit of the temperature adjustment or debugging jacket to increase or decrease the temperature inside the closed room to t2, the air inside the closed room expands or contracts, and the elastic membrane expands or contracts. At this time, the volume of the closed room is (V1 + Geometric volume of the closed chamber) * (273 + t2) / (273 + t1).