JPH08219917A - Lead-out structure at differential pressure detecting part in differential pressure detector - Google Patents

Abstract

PURPOSE: To simplify the structure by interposing an insulation member having a through hole for lead between a differential pressure detecting part and a dielectric sealing part for passing the lead provided at the outer circumferential part of the main body of a differential pressure detector incorporating the differential pressure detecting part. CONSTITUTION: A lead 2 penetrates a dielectric sealing part, i.e., a hermetic seal terminal 3, and passes through a hole of an insulating member 4 to come into pressure contact, at the tip thereof, with each electrode at a differential pressure detecting part 1 thus deriving a detection signal. Since the deburring work, requiring the drilling work of an insulation pipe or a special work such as electrolytic polishing, is limited to only one hole of the insulating member, machining cost is reduced and since an inexpensive insulation material is employed, the material cost can also be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lead lead-out structure for a differential pressure detecting portion, which is particularly simple in material cost,
The present invention relates to a lead portion withdrawing structure of a differential pressure detection unit in a differential pressure detection device, which reduces the number of processing steps and the amount of filled liquid.

[0002]

2. Description of the Related Art A cross-sectional view of FIG.
Description will be given with reference to the top view of (b). In FIG. 2 (a), an insulating ring 5 is fitted on the outer side of a cylindrical differential pressure detection unit 1 with its axis being horizontal, and three rod-shaped leads are attached to the upper portion of the main body 21 corresponding to this ring 5. (Or lead pin)
A hermetically sealed terminal 3 in the form of a short cylinder through which 2 penetrates is fixed (see FIG. 2 (b)). The lead 2 of the hermetically sealed terminal 3 penetrates the insulating pipe 7 and the ring 5 and press-contacts with each electrode (not shown) of the differential pressure detection unit 1 to form a lead lead-out structure. Where insulation pipe 7
Is made of ceramics and is inserted into each of the three holes formed in the main body 21.

Next, a differential pressure detecting device to which this lead drawing structure is applied will be described with reference to the sectional view of FIG. In the figure, this differential pressure detection device 20 is mainly
Main body 21 with built-in differential pressure detector 1 and diaphragm unit 27
, Sub body 25, covers 28 on both left and right sides, and upper case 30
Consists of The main body 21 is in the shape of a cylinder having parallel end faces on both left and right sides, and a bottomed counterbore hole 21a having two counterbored parts is formed from the left end face. The right end surface of the main body 21 has a gap with the seal diaphragm 22 provided here, and a corrugated pattern corresponding to this is processed. This seal diaphragm 22
Receives one of the introduced pressures related to the measured differential pressure. The differential pressure is detected from the right end surface of the main body 21 and the small-diameter counterbore surface of the counterbore hole 21a, which opens so as to open, and from the large-bore counterbore surface of the second counterbore hole 21a. A hole 21c leading to part 1 is drilled. In addition, from the bottom of the outer peripheral surface of the main body 21 into the hole 21b,
A hole having no reference numeral is drilled, and this hole is for filling the internal space with silicone oil, which is a liquid for pressure transmission, and is sealed by a ball 23 and a set screw 24 after filling.

The diaphragm unit 27 has a disk shape, and as shown in a partially cutaway view, a disk-shaped protective diaphragm 27a.
And a conical space which is arranged on both left and right sides thereof and is not attached with a reference numeral, and a hole which communicates with this space. The diaphragm unit 27 is inserted in the counterbore part of the first step of the counterbore hole 21a. The differential pressure detecting portion 1 is inserted into the hole portion of the counterbore hole 21a of the main body 21, and the lead portion 2 from the differential pressure detecting portion 1 is pulled out upward from the upper part of the outer peripheral surface of the main body 21. The sub body 25 has a disk shape and has a hole 25a penetrating in the axial direction. Sub body 25
The left side surface has a gap with the other introduction pressure receiving seal diaphragm 26 related to the measured differential pressure, and the corrugated waveform corresponding to this is processed. Sub body 25 has counterbore hole 21
The hole 25a is inserted into the spot facing portion of the first stage of a and fixed by welding, and the hole 25a communicates with the conical space on the left side of the diaphragm unit 27. After the differential pressure detector 1, the diaphragm unit 27 and the by-product 25 are inserted into the main body 21 and fixed by welding, the main body 21
The inner space between the diaphragm unit 27 and the sub body 25 is filled with silicone oil, and after filling, the ball 23 and the set screw 24 are sealed as described above.

The cover 28 on each of the right and left sides has a hole (perforated at right angles to the paper surface for each of the one and the other introduction pressures related to the measured differential pressure).
(Not shown) to cover the seal diaphragms 22 and 26 and to hermetically seal the main body 21 through the O-rings 29, respectively.
On the other hand, they are fixed by fastening with screws (not shown). The upper case 30 is a tubular member having an amplifier, an arithmetic circuit, an indicator, etc. built therein, and is fixed to the upper portion of the outer peripheral surface of the main body 21 by welding at the peripheral edge thereof.

One of the introduced pressures related to the measured differential pressure is received by the seal diaphragm 22 through an introduction hole (not shown) of the cover 28 on the right side of the main body 21, and is transmitted to the diaphragm unit via the filled liquid. In the space on the right side of 27, the differential pressure detection unit 1
Is transmitted to the corresponding side of. The other introduction pressure is received by the seal diaphragm 26 through the introduction hole of the cover 28 on the left side of the main body 21, and one is inserted into the space on the left side of the diaphragm unit 27 and the other through the filled liquid. It is transmitted to the corresponding side of the detector 1. When only one of the introduced pressures related to the measured differential pressure acts as a large one-side pressure due to an erroneous operation, the well-known protection function based on the protection diaphragm 27a of the diaphragm unit 27 causes the differential pressure detection unit 1 to be overloaded. It is protected from high pressure and is protected from high pressure. Further, all the welded portions in contact with the filled liquid can be structurally located inside the main body 21 so as not to come into contact with the outside air.

[0007]

A drawback of the conventional lead-out structure is that it is difficult to machine the three holes into which the insulating pipe 7 is inserted, and deburring requires special work such as electrolytic polishing. Therefore, the material cost of the insulating pipe 7 itself is high, the total amount of liquid is increased due to the filled liquid filled in the gaps of the respective members, and the differential pressure detection device is lowered due to the influence of temperature in particular. .

The problem to be solved by the present invention is to solve the above problems of the prior art, simplify the structure, reduce the material cost and the processing man-hour, and reduce the amount of the enclosed liquid. It is an object of the present invention to provide a lead-out structure of a differential pressure detection unit in a differential pressure detection device.

[0009]

According to the present invention, a differential pressure detecting portion and an insulating sealing portion for leading out leads provided on the outer peripheral portion of a main body of a differential pressure detecting device incorporating the differential pressure detecting portion are interposed. An insulating member having through holes for leads is provided.

[0010]

According to the present invention, the lead penetrating the insulating sealing portion passes through the hole of the insulating member, and the tip thereof comes into pressure contact with each electrode on the outer periphery of the differential pressure detecting portion to derive a detection signal.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the lead lead-out structure of the differential pressure detecting portion in the differential pressure detecting device according to the present invention will be described below with reference to FIG. FIG. 1 relates to the embodiment, (a)
Is a sectional view thereof, and (b) is a top view thereof. This embodiment is different from the conventional example in that instead of the total of three insulating pipes 7 (see FIG. 2 (a)) through which each lead 2 penetrates, each lead 2
One cylindrical insulating member 4 (FIG.
(see (a)) is used. Therefore, the hermetically sealed terminal 3 as the insulating sealing portion in the invention
The three leads 2 penetrating through pass through the holes of the insulating member 4, respectively, and the tips press-contact with the respective electrodes (not shown) of the differential pressure detection unit 1 to derive the detection signal.

With such a structure, in the conventional example, the main body 21 is machined with three holes for penetrating the insulating pipe 7 (see FIG. 2 (a)), and additionally, special machining such as electrolytic polishing is performed. The deburring process by work only needs to process one hole for the insulating member 4, and the material cost of the relatively expensive ceramic insulating pipe 7 in the conventional example requires only the low material cost of the insulating member 4. In the example, there are three gaps between each hole of the main body 21 and the outer periphery of the insulating pipe 7 and between the inner periphery of each insulating pipe 7 and the lead 2. For the filled liquid filled in these gaps, in the embodiment, The gap between one hole of the main body 6 and the outer periphery of the insulating member 4 and the gap between each of the three holes of the insulating member 4 and the lead 2 can be made small in combination with the improvement of the processing accuracy of the insulating member 4, and the filled liquid The amount of can be reduced. As a result, the degree of influence of temperature is small and the accuracy of differential pressure measurement can be improved.

[0013]

According to the present invention, the following excellent effects can be expected. (1) In the conventional example, the machining of 3 holes for penetrating the insulating pipe in the main body and the deburring process by the special work such as electrolytic polishing incidentally are the machining of only 1 hole for the insulating member. Mu. Therefore, the processing cost can be reduced. (2) The material cost of the insulating member is lower than the material cost of the comparatively expensive insulating pipe in the conventional example, and the material cost can be reduced. (3) In the conventional example, there are three gaps between each hole of the main body and the outer circumference of the insulating pipe and between the inner circumference of each insulating pipe and the lead. With respect to the filled liquid filled in all the gaps, in the embodiment, one hole in the main body and the gap between the outer periphery of the insulating member, and each of the three holes in the insulating member and the gap between the leads are processed with precision of the insulating member. It is possible to reduce the size of the liquid and the amount of filled liquid. Therefore, the degree of influence of temperature is reduced, and the accuracy of differential pressure measurement can be improved.

[Brief description of drawings]

1A and 1B are cross-sectional views and FIG. 1B is a top view of an embodiment according to the present invention.

2A and 2B are cross-sectional views and FIG. 2B is a top view of a conventional example.

FIG. 3 is a sectional view of a differential pressure detecting device to which a conventional example is applied.

[Explanation of symbols]

 1 Differential pressure detector 2 Lead 3 Hermetically sealed terminal 4 Insulation member 5 Ring 6 Main body

Claims (1)

[Claims] 1. An insulation having a through hole for a lead, which is interposed between a differential pressure detecting portion and an insulating sealing portion for leading out a lead, which is provided on an outer peripheral portion of a main body of the differential pressure detecting device which incorporates the differential pressure detecting portion. A lead lead-out structure of a differential pressure detection unit in a differential pressure detection device, characterized in that a member is provided.