US 5,847,282 AGranted

Piezoresistive pressure sensor or pressure detector assembly

AssigneeKeller AG fur Druckmesstechnik

InventorHans W. Keller

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Abstract

An improved piezoresistive pressure sensor or an improved piezoresistive pressure pickup having a pressure measuring cell (13), a transmission diaphragm housing (7), which comprises a jacket housing section, a transmission diaphragm (17) and a backplate (21) and having a fluid pressure chamber (19) situated on the measuring diaphragm side is distinguished by the following features the jacket housing section of the transmission diaphragm housing (7) comprises a pressure chamber sleeve (33), the pressure chamber sleeve (33) and the backplate (21) consists of weldable steel, the transmission diaphragm housing (7) and thus the pressure chamber sleeve (33) are or can be inserted in an annular recess (31) in the connection housing (3) in a sealing manner, the connection housing (3) consists of a material which cannot be welded or cannot easily be welded, and the pressure chamber sleeve (33) and the backplate (21) are permanently welded in a sealing manner so as to seal off the pressure transmission medium provided in the measuring cell inner pressure chamber (15) thus formed.

Claims6

Dependent claims

Piezoresistive pressure responsive sensor or pickup assembly comprising the following features:

(a) a pressure measuring cell;
(b) a transmission diaphragm housing, a pressure transmission diaphragm with opposed side surfaces mounted within said transmission diaphragm housing, and with said transmission diaphragm housing retaining the pressure measuring cell and being filled with a pressure transmission medium, and further comprising a jacket housing section and a backplate;
(c) a connection housing provided on one side of said pressure transmission diaphragm and having a fluid pressure chamber situated therein and being characterized by the following further features:
(1) the jacket housing section of the transmission diaphragm housing includes a pressure chamber sleeve;
(2) the pressure chamber sleeve and the backplate consisting of weldable steel;
(3) the transmission diaphragm housing including the pressure chamber sleeve portion of the jacket housing is adapted to be inserted in an annular recess formed in the connection housing in a sealing manner;
(4) the connection housing consisting of a workable material selected from the group consisting of brass and beryllium bronze, and wherein the pressure chamber sleeve and the backplate are permanently secured together in a sealing manner so as to seal off the pressure transmission medium filling the transmission diaphragm housing retaining the measuring cell so as to form an inner pressure chamber;
(5) the pressure measuring diaphragm being placed on a stepped shoulder formed within the connection housing so as to define the axial length of the annular recess in which the pressure chamber sleeve is received;
and
(6) the pressure measuring diaphragm and the pressure chamber sleeve being joined to the annular recess portion of the connection housing through a soldered connection.

7 more elements

Piezoresistive pressure responsive sensor or pickup assembly comprising the following features:

(a) a pressure measuring cell;
(b) a transmission diaphragm housing, a pressure transmission diaphragm with opposed side surfaces mounted within said transmission diaphragm housing, and with said transmission diaphragm housing retaining the pressure measuring cell being filled with a pressure transmission medium consisting of oil, and further comprising a jacket housing section and a backplate;
(c) a connection housing provided on one side of said pressure transmission diaphragm and having a fluid pressure chamber situated on the pressure transmission diaphragm side of said transmission diaphragm housing and being characterized by the following further features:
(1) the jacket housing section of the transmission diaphragm housing includes a pressure chamber sleeve;
(2) the pressure chamber sleeve and the backplate consist of weldable steel;
(3) the transmission diaphragm housing including the pressure chamber sleeve being adapted to be sealingly inserted in an annular recess formed in the connection housing;
(4) the connection housing consisting of a workable material selected from the group consisting of brass and beryllium bronze, and wherein the pressure chamber sleeve and the backplate are permanently bonded together in a sealing manner so as to seal off the pressure transmission medium filling the transmission diaphragm housing retaining the measuring cell so as to form an inner pressure chamber;
(5) the pressure chamber sleeve being provided with an extension sleeve and wherein said transmission diaphragm is mounted adjacent said extension sleeve so as to be positioned adjacent the inner axial end of the said annular recess;
and
(6) the pressure measuring diaphragm, the pressure chamber sleeve, and the extension sleeve being coupled to the inner surface of the annular recess of the connection housing through joints formed of solder.

7 more elements

Dependencies are inferred from the claim text.