JP2507927Y2 - Flowmeter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a flowmeter in which a mounting substrate having a flow sensor and electrode pins electrically connected to the flow sensor is mounted in an opening of a pipe.

[Conventional technology]

In the conventional flowmeter, when the flow sensor 1 and the mounting substrate 11 to which the electrode pin 2 for transmitting the signal from the flow sensor 1 is mounted are attached to the opening 9 of the pipe through which the fluid to be measured flows, the flow chart shown in FIG. As shown in FIG. 5, the mounting substrate 11 is attached to the pipe wall inside the opening periphery of the pipe with an adhesive, and the potting material is provided in the recess formed by the opening 9 and the mounting substrate 11.
10 was injected to ensure insulation between the electrode pins 2.

[Problems to be solved by the device]

However, in the above-mentioned configuration, in an environment where high temperature heat is brought from the outside, thermal expansion occurs in each component, but when materials having different thermal expansion coefficients are in close contact with each other and interfere with each other's expansion. Causes thermal stress inside the material. In particular, the thermal stress generated between the mounting substrate 11 and the potting material 10 is remarkable, and the thermal stress causes the adhesive surface to peel off to form a gap, and moisture penetrates into the gap to impair the insulation or the electrode pin. It was easy to cause damage such as cracking of the mounting part of 2.

[Purpose of device]

The present invention has been made in view of such a point, and in a flow meter in which a flow sensor and an attachment substrate to which an electrode pin electrically connected to the flow sensor is attached are attached to an opening of a pipe, (EN) Provided is a flow meter which minimizes the generation of thermal stress in each component even under the environment where the heat of the above is brought to ensure the insulation between the electrode pins and prevents the electrode pins from being damaged.

[Means for solving the problem]

According to the configuration of the present invention, the mounting substrate is fixed to the opening of the tube by the packing and the fixing plate, and the electrode cover made of the insulating material is covered on the electrode pins to ensure the insulation between the electrode pins. Can be achieved.

〔Example〕

FIG. 1 is a sectional view showing the structure of the present invention. Reference numeral 1 is a flow sensor for detecting the flow velocity of the fluid flowing in the pipe.
Reference numeral 2 denotes an electrode pin, which transmits a signal sent from the flow sensor 1 to the outside. Reference numeral 3 denotes a tube wall of the tube, and an opening 9 is provided in a portion where the mounting substrate 4 is mounted. Reference numeral 4 denotes a mounting substrate, and the flow sensor 1 is mounted on the flow sensor mounting surface 4A inside the tube at the center of the mounting substrate.
The electrode pin 2 is attached so as to penetrate the attachment substrate from the inside of the tube in the central portion of the substrate and to protrude to the outside. On the other hand, in the shape of the mounting substrate 4, the flow sensor mounting surface 4A
Is projected to the inside of the pipe because the flow sensor 1 reliably captures the fluid flowing in the pipe. 4B is an outer edge of the mounting board, and the mounting board 4 is fixed at a predetermined position by fixing this portion by the fixing plate 7. Reference numeral 5 denotes an electrode cover made of an insulating material, which is covered on the electrode pins in order to secure an edge surface distance for insulation between the electrode pins 2. 6
Is a packing, which is brought into contact with the outside of the pipe wall around the opening 9 and serves to keep the inside of the pipe sealed. A fixing plate 7 serves to fix the mounting substrate 4 so that it does not move. Reference numeral 8 denotes a screw, which fixes the fixing plate 7 to the pipe wall. Reference numeral 9 is an opening to which the mounting substrate 4 is attached. In the mounted state, a constant gap is formed around the outer edge 4B of the mounting board so that the thermal expansion of the mounting board is not hindered.

[Effect of device]

As described above, according to the present invention, even in an environment where high temperature heat is externally applied, the generation of unnecessary thermal stress in the electrode pins is minimized and the insulation between the electrode pins is maintained, It is possible to prevent damage to the pins.
Also, the mounting board is detachable from the pipe, so assembly and maintenance are easy.

[Brief description of drawings]

FIG. 1 is a sectional view showing the constitution of the present invention, and FIG. 2 is a sectional view showing the constitution of a conventional example. 1 ... Flow sensor, 2 ... Electrode pin, 3 ... Tube wall, 4
…… Mounting board, 4A …… Flow sensor mounting surface, 4B …… Mounting board outer edge, 5 …… Electrode cover, 6 …… Packing, 7 ……
Fixing plate, 8 ... screw, 9 ... opening, 10 ... potting material, 11 ... mounting board.

Front page continuation (72) Inventor Takashi Gunji 1-22-1 Kawana, Fujisawa-shi, Kanagawa Yamatake Honeywell Co., Ltd. Fujisawa factory (72) Inventor Setsuo Kuboji 1-2-2 Kawana, Fujisawa-Kanagawa Takeshi Yama Honeywell Co., Ltd. Fujisawa Plant (72) Inventor Shigeru Aoshima 1-22-1 Kawana, Fujisawa, Kanagawa Takeshi Yama Yamauchi Fujisawa Plant (72) Mitsuhiko Nagata 1-22 Kawana, Fujisawa, Kanagawa Prefecture Yamatake Honeywell Co., Ltd. Fujisawa Plant (72) Inventor Tetsuo Kuninaga 1-22 Kawana, Fujisawa City, Kanagawa Yamatake Honeywell Co., Ltd. Fujisawa Plant (72) Inventor Shoji Kamiunten 1-12 Kawana, Fujisawa, Kanagawa Prefecture No. 2 Yamatake Honeywell Co., Ltd. Fujisawa Factory

Claims (1)

(57) [Scope of utility model registration request] 1. A flow meter in which a flow sensor and an attachment substrate having an electrode pin electrically connected to the flow sensor are attached to an opening of a pipe, wherein a periphery of the pipe wall outside the opening is covered with packing. The flow sensor mounting surface is abutted on the opening through the packing so that the flow sensor mounting surface protrudes inward from the inner surface of the pipe wall when the flow sensor mounting surface is mounted, and the flow sensor is fixed to the flow sensor mounting surface. The outer edge is fixed by a fixing plate fixed around the opening, and the electrode pin is projected from the mounting substrate to the outside of the tube.
A flowmeter characterized in that each of the electrode pins is covered with an electrode cover.