Vacuum degree sensing device

Abstract

The invention discloses a vacuum degree sensing device. A lower chamber communicated with a vacuum chamber to be tested and an upper chamber communicated with the atmosphere are arranged in a main casing body. An output interface is arranged on one side of the upper chamber. An external pin is arranged on one side close to the output interface in the upper chamber, and a fixed pin is arranged on the other side. A partition plate is arranged between the lower chamber and the upper chamber. The partition plate is provided with a through hole communicated with the lower chamber and the upper chamber. A PCB board and a pressure sensing element are arranged in the upper chamber above the through hole. The PCB board is fixed in the upper chamber through the external pin and the fixed pin. The pressure sensing element is closely attached to the partition plate through a sealing pad. Air flow holes opposite to the through hole are arranged in the center of the PCB board and the sealing pad. Anupper cover is arranged at the top of the upper chamber. A pipe joint is arranged on the open side of the lower chamber. The vacuum degree sensing device provided by the invention has the characteristics of reasonable structure, high accuracy, high reliability and high practical value.

Description

technical field [0001] The invention relates to the technical field of vacuum degree detection, in particular to a vacuum degree sensor device for an automobile braking system. Background technique [0002] The vacuum sensor device is an important part of the car braking system. It is used to monitor the vacuum degree of the vacuum booster in the car braking system in real time. If the pressure difference in the cavity is too small, the vacuum booster system will fail during braking, which will increase the braking distance. Timely detection and processing of the vacuum degree can avoid affecting the braking performance of the car due to insufficient vacuum degree. However, due to the unreasonable structure of the vacuum degree sensing device in the prior art, there are problems such as easy entry of external water vapor into the interior of the vacuum degree sensing device, poor sealing, and easy occurrence of air leakage at the pressure sensing element, which seriously aff...

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Problems solved by technology

[0003] The purpose of the present invention is to solve the vacuum sensor in the prior art due to its unreasonable structure, the presence of external water vapor that easily enters the interior of the vacuum sensor, and poor sealing that easily causes air leakage at the pressure sensing element, which seriously affects the accuracy and accuracy of the vacuum sensor. To solve the problem of reliability, a vacuum sensor device is provided, which has the characteristics of reasonable structure, high accuracy and reliability

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