Detection air tap

Abstract

A detection air tap comprises a working chamber and a source port communicated with the working chamber, the working chamber provides a pressure sensing piece to sense changes of pressure in the chamber, the pressure in the working chamber is influenced by a connector connected with the source port, and the pressure sensing piece has a working pressure range. Furthermore, the detection air tap is provided with a working pressure maintaining mechanism, the working pressure maintaining mechanism is implemented by a pressure relief structure and a pressure maintaining structure which are arranged on the detection air tap, the pressure relief structure enables the working chamber to exhaust when the pressure in the working chamber exceeds the working pressure range, and the pressure maintaining structure enables the working chamber to exhaust when the pressure in the working chamber exceeds the working pressure range. When the pressure in the working chamber is lower than the pressure outside the detection gas nozzle, the pressure maintaining structure enables the working chamber to receive gas outside the detection gas nozzle.

Description

Technical Field

[0001] The invention relates to a detection gas nozzle, in particular to a detection gas nozzle with a pressure relief structure and a pressure maintaining structure. Background Art

[0002] In the field of pressure sensing, pressure sensing devices are often used for measurement. Pressure sensing devices are generally designed with a working pressure range. When the pressure sensing device is connected to a physiological detection device, the air pressure system formed by the pressure sensing device and the physiological detection device must be maintained within the working pressure range. Once the working pressure range is exceeded, the detection accuracy will be affected. In addition, the aforementioned air pressure system is affected by temperature and gas evaporation, making it difficult to achieve a completely sealed effect in the air pressure system. At the same time, temperature differences will also cause changes in gas volume, making it difficult to maintain the air pressure in the air pressure system, thereby affecting the detection of the pressure sensing device.

[0003] See also Fig. 9 In order to solve the above-mentioned problems, the current pressure sensing field generally sets a gas nozzle 51 in a pneumatic system 50. The gas nozzle 51 is used to connect a pressure sensing component 52 in the pneumatic system 50 with a physiological detection component 53. The physiological detection component 53 uses gas as the main detection basis. The physiological detection component 53 is formed by bonding at least two thin sheets 531. There is a space between the two thin sheets 531 for air to be retained. When the physiological detection component 53 is subjected to pressure, the space changes, thereby changing the internal air pressure. The pressure sensing component 52 senses the pressure change of the physiological detection component 53 through the gas nozzle 51, generates a physiological signal, and transmits the physiological signal to a related computing device through a circuit board 54. In addition, when the physiological detection component 53 is subjected to pressure, causing the pressure of the pneumatic system 50 to exceed the working pressure range, the gas nozzle 51 can release the over-pressure gas in the pneumatic system 50, so that the pneumatic system 50 can be maintained within the working pressure range of the pressure sensing component 52. However, the air nozzle 51 cannot cope with the negative pressure condition in the air pressure system 50 , resulting in that once the physiological detection component 53 stops being pressurized and the volume is restored so that the internal pressure is lower than the external air pressure, the pressure in the physiological detection component 53 cannot be restored, affecting the detection result of the pressure sensor 52 . Summary of the invention

[0004] The main purpose of the present invention is to solve the problem that the conventional detection air nozzle cannot cope with the negative pressure condition.

[0005] To achieve the above-mentioned purpose, the present invention provides a detection gas nozzle, comprising a working chamber and a source port connected to the working chamber, the working chamber provides a pressure sensor to sense the pressure change in the chamber, the pressure in the working chamber is affected by the source port connected, and the pressure sensor has a working pressure range. Further, the detection gas nozzle has a working pressure maintenance mechanism, which is implemented by a pressure relief structure and a pressure holding structure provided on the detection gas nozzle. The pressure relief structure exhausts the working chamber when the pressure in the working chamber exceeds the working pressure range, and the pressure holding structure allows the working chamber to accept the gas outside the detection gas nozzle to enter when the pressure in the working chamber is lower than the pressure outside the detection gas nozzle.

[0006] In one embodiment, the pressure relief structure and the pressure maintaining structure are located on the same axis, and an extension line of the source port and the axis intersect between the pressure relief structure and the pressure maintaining structure.

[0007] In one embodiment, the detection air nozzle has a body and an air inlet defined by the body, and the pressure-maintaining structure is a one-way valve disposed on the air inlet.

[0008] In one embodiment, the one-way valve has a mounting foot disposed on the air inlet, and a flap connected to the mounting foot to selectively close the air inlet.

[0009] In one embodiment, the main body has a first annular wall connected to the air inlet, and the pressure-maintaining structure further includes a porous material piece disposed in a space defined by the first annular wall.

[0010] In one embodiment, the pressure-maintaining structure is activated when the pressure in the working chamber is lower than atmospheric pressure.

[0011] In one embodiment, the detection air nozzle has a main body and an air leakage port defined by the main body, and the pressure relief structure has a valve plate arranged on the air leakage port, an elastic member connected to the valve plate to determine the air leakage speed, and a baffle plate arranged on the main body and providing the elastic member for setting.

[0012] In one embodiment, the pressure relief structure has a connecting piece disposed between the elastic piece and the valve plate.

[0013] In one embodiment, the valve plate has a first surface facing the air leakage port and a second surface facing the connecting member, and the first surface includes a sealing ring portion capable of contacting the edge of the air leakage port.

[0014] In one embodiment, the body has a second annular wall connected to the air leakage port, and at least two mounting holes for assembling the baffle plate are formed on the second annular wall. The baffle plate has at least two lugs assembled with the at least two mounting holes.

[0015] In one embodiment, the detection air nozzle has an air leakage gap defined by the body and the baffle.

[0016] In one embodiment, the free length of the elastic member is greater than the distance between the baffle and the connecting member, each of the at least two mounting holes has a width variation, the at least two lugs are respectively positioned at the widest part of each of the at least two mounting holes, and the portion of each of the at least two mounting holes that is not provided with the at least two lugs forms the venting gap.

[0017] In one embodiment, the connecting member is a cap-shaped structure, and the elastic member is placed in the cap-shaped structure.

[0018] In one embodiment, the width of the cap-shaped structure is smaller than the inner diameter length of the second annular wall.

[0019] In one embodiment, the detection air nozzle has an assembly port for providing the pressure sensing component, and at least one sealing ring disposed on the assembly port.

[0020] Through the above-mentioned implementation of the present invention, compared with the conventional method, the following characteristics are possessed: the detection air nozzle of the present invention is provided with the working pressure maintaining mechanism, and the working pressure maintaining mechanism is implemented through the pressure relief structure and the pressure maintaining structure, so that the pressure of the working chamber can be maintained within the working pressure range of the pressure sensing component. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 , a schematic diagram of a three-dimensional structure of an embodiment of the present invention;

[0022] Figure 2 , a schematic diagram of a structural decomposition of an embodiment of the present invention (I);

[0023] Figure 3 , a schematic diagram of a structural decomposition of an embodiment of the present invention (II);

[0024] Figure 4 , a side view schematic diagram of an embodiment of the present invention;

[0025] Figure 5 , a schematic structural cross-sectional view of an embodiment of the present invention (I);

[0026] Figure 6 , a schematic diagram of an implementation of an embodiment of the present invention (I);

[0027] Figure 7 , a schematic diagram of an implementation of an embodiment of the present invention (II);

[0028] Figure 8 , a schematic structural cross-sectional view of an embodiment of the present invention (II);

[0029] Fig. 9 , a schematic diagram of a commonly used structure.

[0030]

Explanation of symbols

[0031] 20: Check the air nozzle

[0032] 21: Working chamber

[0033] 22: Source port

[0034] 221: Extension line

[0035] 222: Intersection

[0036] 23: Pressure sensing device

[0037] 24: Assembly port

[0038] 25: Sealing ring

[0039] 26: Pressure relief structure

[0040] 261: Axis

[0041] 262: Valve plate

[0042] 263: Elastic parts

[0043] 264: Baffle

[0044] 265: Connecting pieces

[0045] 267: Side 1

[0046] 268: Side 2

[0047] 269: Sealing ring

[0048] 271: Width

[0049] 272: Lugs

[0050] 28: Pressure-maintaining structure

[0051] 281: Install the feet

[0052] 282: Petals

[0053] 283: Hook

[0054] 284: Porous material parts

[0055] 29: Ontology

[0056] 291: First Ring Wall

[0057] 292: Second Ring Wall

[0058] 293: Length

[0059] 294: Mounting hole

[0060] 297: Positioning block

[0061] 31: Air Inlet

[0062] 32: Vent

[0063] 33: Deflation seam

[0064] 50: Air pressure system

[0065] 51: Air nozzle

[0066] 52: Pressure sensing device

[0067] 53: Physiological testing equipment

[0068] 531: Flakes

[0069] 54: Circuit board DETAILED DESCRIPTION

[0070] The detailed description and technical contents of the present invention are now described as follows with reference to the accompanying drawings:

[0071] See also Figures 1 to 5 The present invention provides a detection air nozzle 20, which includes a working chamber 21 and a source port 22 connected to the working chamber 21. The working chamber 21 is connected to a pressure sensing element 23 to provide the pressure sensing element 23 with a sense of pressure changes in the chamber. The pressure sensing element 23 is not limited to an assembly position relative to the detection air nozzle 20, but the pressure sensing element 23 is limited to sense the pressure of the working chamber 21. For an embodiment of the present invention, please refer to Figure 8 The detection air nozzle 20 is provided with an assembly port 24 for providing the pressure sensor 23 . To maintain the internal pressure of the detection air nozzle 20 , the detection air nozzle 20 further has at least one sealing ring 25 disposed at the assembly port 24 .

[0072] Continuing from the above, the pressure in the working chamber 21 is affected by the source port 22 connected to it. The source port 22 is the pressure source of the working chamber 21. The source port 22 can be connected to a detection component (not shown in the figure). The source port 22 receives the gas in the detection component and produces a pressure change in the working chamber 21, thereby allowing the pressure sensing component 23 to sense the pressure change in the working chamber 21. In addition, the pressure sensing component 23 is provided with a working pressure range, which is defined by an upper limit value and a lower limit value sensed by the pressure sensing component 23. The upper limit value and the lower limit value can be obtained based on the self-defined experiment of the pressure sensing component 23, or can be obtained based on the software used by the pressure sensing component 23.

[0073] Furthermore, the detection air nozzle 20 has a working pressure maintaining mechanism, which aims to maintain the pressure of the working chamber 21. The working pressure maintaining mechanism is implemented by a pressure relief structure 26 and a pressure maintaining structure 28 on the detection air nozzle 20. The pressure relief structure 26 and the pressure maintaining structure 28 work based on the pressure of the working chamber 21. When the pressure in the working chamber 21 exceeds the working pressure range, the pressure relief structure 26 exhausts the working chamber 21. When the pressure in the working chamber 21 is lower than the pressure outside the detection air nozzle 20, the pressure maintaining structure 28 allows the working chamber 21 to accept the gas outside the detection air nozzle 20 to enter. It should be understood that the air intake of the working chamber 21 described in this article refers to the natural air intake of the working chamber 21 without being affected by external force.

[0074] The following will describe the implementation of the detection nozzle 20. Figures 5 to 7 . Assuming that initially, when the pressure in the working chamber 21 meets the working pressure range and the pressure outside the detection air nozzle 20, the pressure relief structure 26 and the pressure holding structure 28 are not activated, so that the working chamber 21 does not take in air or exhaust air. Once the source port 22 is connected to the pressure, the pressure increase of the source port 22 will also affect the working chamber 21, so that the pressure in the working chamber 21 exceeds the working pressure range, and the pressure relief structure 26 will be activated, thereby exhausting the working chamber 21 until the pressure in the working chamber 21 drops to meet the working pressure range. On the contrary, when the source port 22 is connected to the pressure stops receiving pressure and restores the volume, the pressure of the source port 22 drops and affects the working chamber 21, so that the pressure in the working chamber 21 is lower than the pressure outside the detection air nozzle 20, and the pressure holding structure 28 will be activated, thereby allowing the working chamber 21 to take in air until the pressure in the working chamber 21 rises to meet the working pressure range.

[0075] As can be seen from the foregoing, the detection air nozzle 20 of the present invention integrates the pressure relief structure 26 and the pressure maintaining structure 28, so that the detection air nozzle 20 can respond to the over-high pressure and under-pressure conditions of the source port 22 connected to maintain the pressure in the working chamber 21 within the working pressure range of the pressure sensing element 23, thereby solving the problem that conventional air nozzles cannot respond to the situation caused by under-pressure.

[0076] As above, please refer to Figures 1 to 5 In the present invention, the pressure relief structure 26 and the pressure maintaining structure 28 are located on the same axis 261 , and an extension line 221 of the source port 22 intersects with the axis 261 to form an intersection 222 , and the intersection 222 is located between the pressure relief structure 26 and the pressure maintaining structure 28 .

[0077] Furthermore, the detection air nozzle 20 has a body 29 and an air inlet 31 defined by the body 29. The air inlet 31 provides the air intake function for the working chamber 21. The pressure-maintaining structure 28 is a one-way valve provided at the air inlet 31. The one-way valve is activated when the pressure in the working chamber 21 is lower than the atmospheric pressure, and releases the air inlet 31 to allow air to enter the working chamber 21. In more detail, the one-way valve has a mounting foot 281 provided at the air inlet 31, and a flap 282 connected to the mounting foot 281. The flap 282 is arranged facing the air inlet 31 and limits the air inlet 31 to only accept gas from the outside of the detection air nozzle 20. The mounting foot 281 allows the flap 282 to selectively release the air inlet 31 to allow air to enter the air inlet 31. In another embodiment, a hook 283 is provided at one end of the mounting foot 281 that is not connected to the flap 282 . The hook 283 can be restricted by the body 29 to prevent the one-way valve from being separated.

[0078] For further information, see Figures 5 to 7 In one embodiment, the main body 29 has a first annular wall 291 connected to the air inlet 31, and the pressure maintaining structure 28 further includes a porous material piece 284. The porous material piece 284 is arranged in the space defined by the first annular wall 291 and is located at the air inlet end of the air inlet 31, that is, the porous material piece 284 receives the gas from the outside of the detection gas nozzle 20 earlier than the air inlet 31, thereby allowing the porous material piece 284 to provide gas filtering function, silencing function, etc. to the air inlet 31.

[0079] On the other hand, see Figures 1 to 5 The detection air nozzle 20 further has an air release port 32 defined by the body 29, and the air release port 32 provides the working chamber 21 with an air release function. The pressure relief structure 26 is connected to the body 29 and includes a valve plate 262 disposed on the air release port 32, an elastic member 263 connected to the valve plate 262, and a baffle 264 disposed on the body 29. The baffle 264 provides the elastic member 263 with a setting, so that the two ends of the elastic member 263 are respectively connected to the valve plate 262 and the The baffle plate 264, and the valve plate 262 can selectively close the air leakage port 32 based on the action of the elastic member 263. Specifically, when the pressure in the working chamber 21 is less than the pressure of the elastic member 263 acting on the valve plate 262, the elastic member 263 allows the valve plate 262 to close the air leakage port 32, and when the pressure in the working chamber 21 is greater than the pressure of the elastic member 263 acting on the valve plate 262, the elastic member 263 allows the valve plate 262 to release the air leakage port 32. It can be seen that the air leakage speed of the pressure relief structure 26 is determined by the elastic member 263, and the air leakage speed of the pressure relief structure 26 is proportional to the pressure in the working chamber 21.

[0080] Continuing from the above, the pressure relief structure 26 further has a connecting member 265 disposed between the elastic member 263 and the valve plate 262. The connecting member 265 is a cap-shaped structure, in which the elastic member 263 is disposed. The connecting member 265 can be a plane or a convex surface on the side facing the valve plate 262. The plane and the convex surface must be at least sufficient to close the air leakage port 32. For the convex surface, the convex surface further provides a pressure retention function of the pressure relief structure 26 at low pressure (e.g., below 5 kPa), and allows the valve plate 262 to be displaced or deformed to release the air leakage port 32. The valve plate 262 has a first surface 267 facing the air leakage port 32 and a second surface 268 facing the connecting member 265. The first surface 267 includes a sealing ring portion 269, which is located at the periphery of the valve plate 262 and can be used to contact the edge of the air leakage port 32 to seal the air leakage port 32. The second surface 268 is set corresponding to the side of the connecting member 265 facing the valve plate 262.

[0081] Also, see Figures 5 to 7 The body 29 has a second annular wall 292 connected to the air release port 32. The inner diameter length 293 of the second annular wall 292 must be greater than the width 271 of the cap-shaped structure. In this way, when the pressure relief structure 26 is deflated, the gas from the air release port 32 can be discharged through the second annular wall 292 and the cap-shaped structure. Furthermore, at least two mounting holes 294 are formed on the second annular wall 292. The baffle 264 has at least two lugs 272. The at least two lugs 272 are used to be assembled with the at least two mounting holes 294.

[0082] Next, the detection gas nozzle 20 has an air leakage slit 33 defined by the body 29 and the baffle 264. The air leakage slit 33 is connected to the air leakage port 32 and provides the gas from the air leakage port 32 to be discharged to the outside. In addition, the free length of the elastic member 263 is greater than the distance between the baffle 264 and the connecting member 265, so that after the elastic member 263 is assembled, it will be compressed by the baffle 264 and the connecting member 265, and then temporarily store elastic force. Each of the at least two mounting holes 294 has a variable width. The at least two lugs 272 are respectively positioned at the widest part of each of the at least two mounting holes 294 by the action of the elastic member 263. The portion of each of the at least two mounting holes 294 without the at least two lugs 272 forms the air leakage slit 33. Furthermore, each of the at least two mounting holes 294 has a positioning block 297, and the positioning block 297 is located at the narrowest part of each of the at least two mounting holes 294 to limit the separation of the at least two lugs 272. In addition, one end of each of the at least two mounting holes 294 is open, so that the at least two lugs 272 can be installed in the at least two mounting holes 294.

Claims

1. A detection air nozzle, comprising a working chamber and a source port connected to the working chamber, the working chamber provides a pressure sensor to sense the pressure change in the chamber, the pressure in the working chamber is affected by the source port connected, the pressure sensor has a working pressure range, and the detection air nozzle is characterized by: The detection gas nozzle has a working pressure maintaining mechanism, which is implemented by a pressure relief structure and a pressure maintaining structure arranged on the detection gas nozzle. The pressure relief structure exhausts the working chamber when the pressure in the working chamber exceeds the working pressure range, and the pressure maintaining structure allows the working chamber to accept the gas outside the detection gas nozzle to enter when the pressure in the working chamber is lower than the pressure outside the detection gas nozzle.

2. The detection gas nozzle according to claim 1, characterized in that: The pressure relief structure and the pressure maintaining structure are located on the same axis, and an extension line of the source port and the axis intersect between the pressure relief structure and the pressure maintaining structure.

3. The detection gas nozzle according to claim 1, characterized in that: The detection air nozzle has a body and an air inlet defined by the body, and the pressure-maintaining structure is a one-way valve arranged on the air inlet.

4. The detection gas nozzle according to claim 3, characterized in that: The one-way valve has a mounting foot arranged on the air inlet, and a flap connected to the mounting foot to selectively close the air inlet.

5. The detection gas nozzle according to claim 4, characterized in that: The main body has a first annular wall connected to the air inlet, and the pressure-maintaining structure further comprises a porous material piece arranged in a space defined by the first annular wall.

6. The detection gas nozzle according to any one of claims 1 to 5, characterized in that: The pressure-maintaining structure is activated when the pressure in the working chamber is lower than atmospheric pressure.

7. The detection gas nozzle according to claim 6, characterized in that: The detection air nozzle has a body and an air leakage port defined by the body. The pressure relief structure has a valve plate arranged on the air leakage port, an elastic member connected to the valve plate to determine the air leakage speed, and a baffle plate arranged on the body and providing the elastic member.

8. The detection gas nozzle according to claim 6, characterized in that: The pressure relief structure has a connecting piece arranged between the elastic piece and the valve sheet.

9. The detection gas nozzle according to claim 8, characterized in that: The valve plate has a first surface facing the air leakage port and a second surface facing the connecting member. The first surface includes a sealing ring portion capable of abutting against the edge of the air leakage port.

10. The detection gas nozzle according to claim 8, characterized in that: The main body has a second annular wall connected to the air leakage port. The second annular wall is formed with at least two mounting holes for the baffle plate to be assembled. The baffle plate has at least two lugs assembled with the at least two mounting holes.

11. The detection gas nozzle according to claim 10, characterized in that: The detection air nozzle has an air leakage gap defined by the body and the baffle.

12. The detection gas nozzle according to claim 11, characterized in that: The free length of the elastic member is greater than the distance between the baffle and the connecting member. Each of the at least two mounting holes has a width variation. The at least two lugs are respectively positioned at the widest part of each of the at least two mounting holes. The portion of each of the at least two mounting holes that is not provided with the at least two lugs forms the air leakage gap.

13. The detection gas nozzle according to claim 10, characterized in that: The connecting piece is a cap-shaped structure, and the elastic piece is placed inside the cap-shaped structure.

14. The detection gas nozzle according to claim 13, characterized in that: The width of the cap-shaped structure is smaller than the inner diameter length of the second annular wall.

15. The detection gas nozzle according to claim 1, characterized in that: The detection gas nozzle has an assembly opening for arranging the pressure sensing component and at least one sealing ring arranged at the assembly opening.

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