THIN FILM PRESSURE SENSOR Russian patent published in 2017 - IPC G01L19/04 

FIELD: measuring equipment.

SUBSTANCE: claimed thin film pressure sensor comprises a sensing element, a union nut, inside which a cylindrical housing with switching elements is partially disposed, a cable entry, a cable bridge and a blinded bushing mounted on a cylindrical housing, on the side surface of which a nozzle with a hole located with the sharp angle to the housing. The nozzle is partially or completely made in the form of a local and smooth thickening of the sidewall of the bushing as it approaches the opening, and in the opening of the branch pipe, in the area of its thickening from the side of the inner cavity, an expanded portion is provided in which the fastening elements of the cable bridge are arranged. The cylindrical body is hermetically connected on one side along the end with the terminal block and on the other side with the sensitive element. The direction of the screw threaded contour of the threaded connection of the cylindrical body with the bushing is opposite to the direction of the screw threaded contour of the union nut. The bushing is mounted on a cylindrical body with the tightening torque, the value of which is determined by the relation M_B=KM_N, where K is the coefficient taking into account the ratio of the maximum permissible torque of the bushing with the cylindrical body, at which there is no change in the characteristics of the sensor, more changes in the characteristics of the sensor when the tightening torque of the union nut is applied, the maximum tightening torque of the union nut necessary to ensure a tight connection of the sensor to the object is calculated by the sensor for a particular size; M_N is the maximum tightening torque of the union nut necessary to ensure a tight connection between the sensor and the object, and on the body in the area equidistant from the points of its connection with the sensor element and the terminal block, the ring stop is provided, the outer diameter d_S of which is executed in accordance with the relation d_B<d_S<d_N, where d_B is the diameter of the thread of the bushing; d_N is the inside diameter of the union nut.

EFFECT: decrease in the error due to a wide range of non-stationary temperatures and increased vibration acceleration due to the possibility of an optimal placement of the cable jumper on the site due to the possibility of defect-free orientation of the threaded bushing branch when the sensor is mounted on the object and the sensor is removed from the object, improving the performance of the sensor with a minimum amount of experimental testing composition of products.

3 cl, 1 dwg