Air pressure detection device

Abstract

The utility model discloses an air pressure detection device, which comprises a detection shell, the detection shell comprises a detection end, a detection cavity is arranged in the detection shell, a detection air passage is arranged in the detection end, and the detection air passage is communicated with the detection cavity and the outside of the detection end; a detection sheet is arranged in the detection air passage, and a detection core body is arranged in the detection cavity corresponding to the detection air passage; the air pressure detection device is characterized in that the detection core body is provided with a detection air channel, the detection core body is provided with a detection cavity, the detection shell is further provided with an air guide hole communicated with the detection cavity and the outside, and the air guide hole is formed in the detection shell in the direction of the side, far away from the detection air channel, of the detection core body. Therefore, the error in the calculation process is eliminated, and the precision can be ensured in a low-voltage detection scene.

Description

Technical Field

[0001] The utility model relates to the technical field of detection equipment, in particular to an air pressure detection device. Background Art

[0002] In the prior art, for the detection of pipeline air pressure, a closed shell air pressure detector is usually used, whose detection end is connected to the pipeline to be tested, and the other parts of the air pressure detector are sealed. During the detection, the absolute pressure is detected and then the atmospheric pressure is subtracted to obtain the gas pressure in the pipeline. Since the shell of the air pressure detector is sealed, the atmospheric pressure involved in the calculation process is actually the pressure inside the shell of the air pressure detector. The disadvantage of this detection method is that the pressure inside the shell of the air pressure detector is airtight, so it will be affected by temperature conditions, thereby introducing temperature errors in the calculation process, which are ultimately reflected in the detection results. Usually, in medium-pressure detection of about 0.4-1 MPa, or in higher pressure detection scenarios, due to the large absolute pressure, the error caused by temperature changes is usually less than 0.01 MPa, so the error affecting the final result is less than 2%, so it can be used within the allowable error range.

[0003] However, in some low-pressure detection scenarios, such as the air pressure detection device installed at the household end of the gas pipeline, the air pressure is only 2-3kPa. In this case, the kPa-level error caused by the temperature change in the sealed shell has a great impact on the result, and it is basically unusable. Utility Model Content

[0004] In order to solve the deficiencies in the prior art, the utility model provides an air pressure detection device. The air pressure detection device opens an air hole on the detection shell so that the atmospheric pressure in the detection shell is the real atmospheric pressure, thereby eliminating this part of the error in the calculation process and ensuring accuracy in low-pressure detection scenarios.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] The utility model provides an air pressure detection device, including a detection shell, the detection shell includes a detection end, a detection cavity is arranged in the detection shell, a detection airway is arranged in the detection end, and the detection airway connects the detection cavity and the outside at the detection end;

[0007] A detection sheet is arranged in the detection airway, and a detection core is arranged in the detection cavity corresponding to the detection airway;

[0008] The detection shell is also provided with an air guide hole connecting the detection cavity with the outside, and the air guide hole is provided on the detection shell on a side of the detection core away from the detection airway.

[0009] The air pressure detection device of the utility model, when working, installs the detection end to the detection port of the pipeline to be detected, so that the pipeline to be detected is connected with the detection airway of the detection end, and the air pressure in the pipeline to be detected is detected by the detection sheet and the detection core to obtain the absolute pressure, and then the final detection value is obtained by calculation with the atmospheric pressure. Since the detection cavity is connected with the outside world through the air guide hole, the atmospheric pressure parameter introduced by the air pressure detection device of the utility model in the calculation process is the real atmospheric pressure, so there is no error in the atmospheric pressure caused by temperature change.

[0010] The air pressure detection device of the utility model opens an air hole on the detection shell so that the atmospheric pressure in the detection shell is the real atmospheric pressure, thereby eliminating this part of the error in the calculation process and ensuring accuracy in the low-pressure detection scenario.

[0011] In a further technical solution, the outer peripheral shape of the detection core matches the shape inside the detection cavity, and a sealing ring is arranged around the outer peripheral surface of the detection core.

[0012] By designing the shape and the sealing ring, the detection core isolates the detection cavity inside the detection shell from the detection airway. When detecting the air pressure, the absolute pressure and the atmospheric pressure do not interfere with each other, further improving the accuracy of the detection results.

[0013] In a further technical solution, a thread is provided on the outer peripheral surface of the detection end.

[0014] The installation of the detection device itself is made more convenient by providing a thread on the outer peripheral surface of the detection end.

[0015] In a further technical solution, the air guide hole is a waterproof hole.

[0016] The air guide holes are set as waterproof holes to prevent external water from entering the detection cavity and affecting the detection core, which is safer.

[0017] In a further technical solution, a water-proof and breathable membrane is provided in the air guide hole.

[0018] A water-proof and breathable membrane is set in the air guide hole to keep the balance of atmospheric pressure intact. At the same time, water mist from the outside is isolated, which makes it safer.

[0019] The beneficial effects are:

[0020] 1. The air pressure detection device of the utility model opens an air hole on the detection shell so that the atmospheric pressure in the detection shell is the real atmospheric pressure, thereby eliminating this part of the error in the calculation process and ensuring accuracy in low-pressure detection scenarios.

[0021] 2. By designing the shape and the sealing ring, the detection core isolates the detection cavity inside the detection shell from the detection airway. When detecting the air pressure, the absolute pressure and the atmospheric pressure do not interfere with each other, further improving the accuracy of the detection results.

[0022] 3. By providing threads on the outer peripheral surface of the detection end, the installation of the detection device itself is more convenient.

[0023] 4. The air guide hole is set as a waterproof hole to prevent external water from entering the detection cavity and affecting the detection core, which is safer.

[0024] 5. A water-proof and breathable membrane is set in the air guide hole so that the balance of atmospheric pressure is not affected. At the same time, the external water mist is isolated outside, which is safer. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of an air pressure detection device according to an embodiment of the utility model.

[0026] 10. Detection shell; 11. Detection end; 12. Detection airway; 13. Detection sheet; 14. Detection core; 15. Air guide hole; 16. Waterproof and breathable membrane. DETAILED DESCRIPTION

[0027] The utility model is further described below in conjunction with the accompanying drawings:

[0028] Example:

[0029] An air pressure detection device, such as Figure 1 As shown, it includes a detection housing 10, the detection housing 10 includes a detection end 11, a detection cavity is arranged in the detection housing 10, a detection airway 12 is arranged in the detection end 11, and the detection airway 12 connects the detection cavity with the outside at the detection end 11;

[0030] A detection sheet 13 is provided in the detection airway 12, and a detection core 14 is provided in the detection cavity corresponding to the detection airway 12;

[0031] The detection housing 10 is also provided with an air guide hole 15 connecting the detection cavity with the outside. The air guide hole 15 is provided on the detection housing 10 on a side of the detection core 14 away from the detection air channel 12 .

[0032] The air pressure detection device of the utility model, when working, installs the detection end 11 to the detection port of the pipeline to be detected, so that the pipeline to be detected is connected with the detection air channel 12 of the detection end 11, and the air pressure in the pipeline to be detected is detected by the detection sheet 13 and the detection core 14 to obtain the absolute pressure, and then obtains the final detection value by calculation with the atmospheric pressure. Since the detection cavity is connected with the outside world through the air guide hole 15, the atmospheric pressure parameter introduced by the air pressure detection device of the utility model in the calculation process is the real atmospheric pressure, so there is no error in the atmospheric pressure caused by temperature change.

[0033] In this embodiment, the detection core 14 adopts an MPM3801 digital pressure sensor.

[0034] The air pressure detection device of the utility model opens an air hole 15 on the detection housing 10 so that the atmospheric pressure in the detection housing 10 is the real atmospheric pressure, thereby eliminating this part of the error in the calculation process and ensuring accuracy in low-pressure detection scenarios.

[0035] In another embodiment, if Figure 1 As shown, the outer peripheral shape of the detection core 14 matches the shape of the detection cavity, and a sealing ring is arranged around the outer peripheral surface of the detection core 14 .

[0036] By designing the shape and the sealing ring, the detection core 14 isolates the detection cavity inside the detection housing 10 from the detection airway 12, and the absolute pressure and the atmospheric pressure do not interfere with each other when detecting the air pressure, further improving the accuracy of the detection result.

[0037] In this embodiment, the detection cavity is a cylindrical cavity, the outer shape of the detection core 14 is cylindrical, and a sealing groove is annularly provided on the outer circumference of the detection core 14, and a sealing ring is embedded in the sealing groove.

[0038] In another embodiment, a thread is formed on the outer peripheral surface of the detection end 11 .

[0039] By providing threads on the outer peripheral surface of the detection end 11, the installation of the detection device itself is more convenient.

[0040] In another embodiment, the air guide hole 15 is a waterproof hole.

[0041] The air guide hole 15 is set as a waterproof hole to prevent external water from entering the detection cavity and affecting the detection core 14, thereby improving safety.

[0042] In this embodiment, the waterproof hole is designed to have a bent shape. Specifically, a countersunk hole is drilled from the outside of the detection shell 10 to the inside and tilted upward, and then a countersunk hole is drilled from the inside of the detection shell 10 to the inside and tilted upward so that the two countersunk holes intersect. At this time, due to the bend, external rain and the like are naturally avoided.

[0043] In another embodiment, if Figure 1 As shown, a water-proof and breathable membrane 16 is provided in the air guide hole 15 .

[0044] A water-proof and breathable membrane 16 is arranged in the air guide hole 15 so that the balance of atmospheric pressure is not affected and at the same time the external water mist is isolated from the outside, which is safer.

[0045] Specifically, the waterproof and breathable membrane 16 is a molecular membrane that only allows gas to pass through. Compared with the previous embodiment, the waterproof effect is better.

[0046] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, and these changes and improvements fall within the scope of the utility model to be protected.

Claims

1. An air pressure detection device, characterized in that: The detection housing comprises a detection end, a detection cavity is arranged in the detection housing, a detection airway is arranged in the detection end, and the detection airway connects the detection cavity with the outside at the detection end; A detection sheet is arranged in the detection airway, and a detection core is arranged in the detection cavity corresponding to the detection airway; The detection shell is also provided with an air guide hole connecting the detection cavity with the outside, and the air guide hole is provided on the detection shell on a side of the detection core away from the detection airway.

2. The air pressure detection device according to claim 1, characterized in that: The outer peripheral shape of the detection core body matches the shape of the detection cavity, and a sealing ring is arranged around the outer peripheral surface of the detection core body.

3. The air pressure detection device according to claim 1, characterized in that: The outer peripheral surface of the detection end is provided with threads.

4. The air pressure detection device according to claim 1, characterized in that: The air guide hole is a waterproof hole.

5. The air pressure detection device according to claim 1, characterized in that: A water-proof and breathable membrane is arranged in the air guide hole.

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