JPS61139448U - - Google Patents

Description

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view showing a differential pressure transmitter according to an embodiment of the present invention, Fig. 2 is a cross-sectional view around a casing filling block showing a modification of the present invention, and Fig. 3 is a cross-sectional view showing a conventional differential pressure transmitter. The sectional view shown in FIG. 4 is an explanatory view showing the state of force acting on the fixed portion of the center diaphragm of the differential pressure transmitter shown in FIG. 3. 2...Center diaphragm, 3a, 3b...Liquid separation diaphragm, 4a, 4b...Liquid separation diaphragm seat, 5a, 5b...Pressure transmission medium, 7...Pressure sensing element, 9a, 9b...Liquid contact flange, 14...Fixing part, 21...Casing main body part, 22...Casing filling block, 23a...Female thread, 23b
... Male thread, 24 ... Crab eye hole, 25 ... Welded part, 26 ... Communication hole, 27 ... Communication groove, 28a, 2
8b...Communication hole, 32...Casing filling block, 32a...Tightening block, 32b...Press block.

Claims (1)

[Claims for Utility Model Registration] (1) A casing body having a mortar shape, a casing filling block fitted into a recess of the casing body with a gap left between the bottom surface thereof, and the cavity. a center diaphragm disposed within the casing main body, the periphery of which is clamped and fixed between the bottom surface periphery of the recess of the casing main body and the end surface periphery of the filling block to isolate the gap into two chambers; and the casing main body. A pair of liquid separating diaphragms are provided on the outer end surface of the casing filling block and on the outer end surface of the casing filling block, respectively, with their peripheral portions being airtightly fixed, and a through hole communicating between both end surfaces of the casing filling block connects the center diaphragm to the casing filling block. A first pressure chamber formed between the center diaphragm and the other liquid diaphragm, and a through hole communicating between the bottom surface of the recess in the casing body and the outer end surface of the casing body. A second pressure chamber formed between the liquid separating diaphragm and a cavity in the sensor storage section protruding from a part of the outer peripheral surface of the casing main body are separated into two chambers, one of which is arranged. a pressure-sensitive element whose chamber is in communication with the first pressure chamber through a communication hole and whose other chamber is communicated with the second pressure chamber through a communication hole; chambers on both sides of the pressure-sensor element; A pressure transmission medium sealed in the communication hole and both the first and second pressure chambers and a fluid to be measured are introduced to the outside of the pair of liquid separation diaphragms each airtightly attached to both end surfaces of the casing body. In a differential pressure transmitter comprising a pair of liquid contact flanges, a female thread is provided on the inner circumferential surface of the recess of the casing body, and a female thread is screwed onto the outer circumferential surface of the casing filling block. A center diaphragm sandwiched between the casing main body and the casing filling block, which are connected by screwing the male thread and the female thread, presses the periphery of the center diaphragm. A differential pressure transmitter characterized by being fixed. (2) The casing filling block has a communication groove formed in the end surface facing the center diaphragm, passing through the open end of the communication hole on the outer peripheral surface of the filling block and going around the outer peripheral surface. A differential pressure transmitter according to claim 1, which is characterized by: (3) The casing filling block includes a tightening block having a thread on its outer circumferential surface, and a presser block having a communicating hole in its end surface facing the center diaphragm, one end of which is open and the other end of which is open in the outer circumferential surface. The differential pressure transmitter according to claim 1, wherein the differential pressure transmitter is divided by a plane perpendicular to the axis of the casing filling block.