Pressure sensor for detecting hydraulic pressure and method of resisting liquid freezing expansion pressure
A pressure sensor and pressure technology, applied in the direction of measuring fluid pressure, measuring fluid pressure through mechanical components, elastic deformation gauge fluid pressure measurement, etc., to achieve the effects of reducing the overall volume, resisting expansion pressure, and simplifying the structure
Inactive Publication Date: 2016-11-16
AMPHENOL CHANGZHOU CONNECTOR SYST
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[0005] In view of the foregoing, the present invention provides a pressure sensor for detecting hydraulic pressure and a method for resisting liquid freezing expansion pressure, so as to solve the problem of absorbing expansion force through elastic installation, elastic material or foam of the aforementioned existing vehicle urea solution pressure sensor. The resulting technical problem is to provide a pressure sensor that can be applied in complex environments to detect corrosive liquid medium hydraulic pressure normally, and can still maintain the pressure measurement function after the liquid medium freezes and expands. At the same time, it has high precision, A pressure sensor with beneficial technical effects such as good reliability and convenient installation
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[0031] In order to facilitate the understanding of the present invention, the following will be described in conjunction with the accompanying drawings and embodiments.
[0032] see Figure 1 to Figure 7 , the present invention provides a pressure sensor for detecting hydraulic pressure and a method for resisting liquid freezing expansion pressure, the pressure sensor can be used to detect the hydraulic pressure of liquid medium, especially refers to the liquid state that may freeze when used Medium, such as vehicle urea solution.
[0033]The pressure sensor includes a shell 10 , an assembly shell 20 , silicone oil 30 , a pressure sensitive diaphragm 40 , a pressure sensitive unit 50 and a signal processing unit 60 . in:
[0034] Such as figure 1 As shown, the inside of the housing 10 is used to contain liquid medium. The housing 10 is provided with a set of openings 11 and a limiting flange 12 formed on the inner wall of the set of openings 11. The limiting flange 12 has ...
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The invention provides a pressure sensor for detecting hydraulic pressure and a method of resisting liquid freezing expansion pressure. The pressure sensor comprises a housing, an assembly shell, silicone oil, a pressure sensitive diaphragm and a pressure sensitive unit. Through packaging the pressure sensitive diaphragm in the housing, communication between space provided with the pressure sensitive unit and the silicone oil and space for accommodating a liquid medium is blocked. At least one flow guide hole and limiting stop are formed between the pressure sensitive diaphragm and the pressure sensitive unit, the pressure sensitive diaphragm is compressed towards the flow guide hole after pressure is executed to the pressure sensitive diaphragm by the liquid medium, the pressure is then transferred to the pressure sensitive unit through compressing the silicone oil, the compression amplitude of the pressure sensitive diaphragm is limited by the limiting stop, and thus, the phenomenon that after the liquid medium is expanded, excessive pressure is executed to the pressure sensitive unit can be resisted. Through the above technical scheme, the technical problem that the existing hydraulic pressure sensor can not give consideration to freezing expansion pressure resistance and detection element protection is solved, and the pressure sensor has the beneficial technical effects of high precision, good reliability, convenient mounting and the like.
Description
technical field [0001] The invention relates to the technical field of pressure sensors for hydraulic pressure detection, in particular to a pressure sensor capable of resisting freezing expansion of a liquid medium and a method for resisting the freezing expansion pressure of the liquid medium. Background technique [0002] As the international requirements for vehicle exhaust emissions become more and more stringent, many truck and commercial vehicle manufacturers choose to use selective catalytic reduction (SCR) to reduce nitrogen oxide emissions. The reducing agent is a 32.5% aqueous urea solution. The aqueous urea solution will freeze at -11°C, and the solid volume will increase by about 10% compared to the liquid volume. Therefore, a key design requirement for the urea solution pressure sensor is to be able to resist urea Freezing expands. [0003] At present, the anti-icing design of urea pressure sensor mainly adopts elastic installation at home and abroad, and abso...
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Login to View More IPC IPC(8): G01L7/08G01L19/06
CPCG01L7/08G01L7/082G01L19/06
Inventor 沈建新吴晓冬陶捷铠
Owner AMPHENOL CHANGZHOU CONNECTOR SYST