JPH0140206Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to the structure of a converter used in an electromagnetic calorimeter, an electromagnetic flowmeter, a differential pressure transmitter, and the like.

[Prior art]

Conventional converters generally use a cast metal case, which houses the electronic circuit, covers it with a cast metal lid, makes it watertight with packing, etc., and fixes it with a set screw. However, this has disadvantages such as increased weight and cost.

On the other hand, in recent years, electromagnetic calorimeters installed indoors have been developed, and there has been a demand for a lightweight and inexpensive converter that does not require watertightness.

[Summary of the idea]

The present invention has the purpose of eliminating all of the drawbacks of the conventional method and completely satisfying the requirements.The casing is composed of a base plate and a cover made of sheet metal, and the inside of the casing is made of heat insulating material. At the same time, a shielding plate having magnetic shielding properties is provided, so that electronic components that generate heat and leakage magnetic flux and electronic circuits can be housed in the same housing, and the rigidity of the housing is significantly increased. The present invention provides a highly effective transducer structure.

〔Example〕

Hereinafter, details of the present invention will be explained with reference to figures showing embodiments.

Figure 1 shows the converter, A is a plan view of the cover with the ceiling section removed, B is a cutaway side view of the main parts, and C is a front view of the cover with the front section removed. The base plate 11 used is formed by bending both side parts 13a and 13b from the bottom part 12 into a U-shape, and at the approximately center of the bottom part 12, there is a pipe-shaped connecting part 14 projecting downward. It is fixed by welding or the like, and set screws 15a and 15b are screwed into this at a relative angle of about 90 degrees to each other, and the connecting part 14 is connected to the connecting part 16 of the detector shown by the chain line from the outside. After fitting, if the set screws 15a and 15b are screwed in until they are pressed against the tapered portion 17 of the connecting portion 16, both the connecting portions 14 and 16 At the same time, the connecting portion 16 is eccentrically pressed into the connecting portion 14 by the set screws 15a and 15b, and the connection portions 14 and 16 are completely fixed.

In addition, hook-outs 18 for piping are formed on the side parts 13a and 13b by stamping.
Suitable for piping and wiring at installation sites.

Furthermore, brackets 21a and 21b are fixed to the inner sides of the side surfaces 13a and 13b by welding or the like so as to face each other, and a screw hole 23 is bored in a protrusion 22 that protrudes inwardly. , by screws 24 screwed into this, the flexible plate 3 made of iron plate is attached.
1 is fixed almost horizontally.

Therefore, the interior of the base plate 11 is partitioned almost horizontally by the shearing plate 31, and a thermal and magnetic shearing effect occurs between the upper and lower parts of the plate, so that the bottom part 12 is In addition to providing a power transformer 41, wiring boards 42a and 4 are provided above the shield plate 31.
Even if an electronic circuit is mounted on the power supply voltage generator 2b, the heat generated from the power supply voltage generator 41 will be reflected by the shielding plate 31, and the leakage magnetic flux generated in the same way will be cut off by the shielding plate 31. It does not interfere with electronic circuits.

Note that the stiffening plate 31 has both side portions 13a,
A notch 32a, 3 for wiring between the inside of 13b
2b, a lead wire 43 is inserted through this portion, and a plug 44 is provided at the tip of the lead wire 43.
Therefore, it is connected to the receptacle 45 of the wiring boards 42a and 42b, while the heat dissipation fin 4 of the power transistor is connected to the notch 32a side.
6 protrudes, and the notch 32a also functions as a cooling air passage.

In addition, a boss 33 is embedded in the shield plate 31, and wiring boards 42a and 42b are fixed by a screw 34 and a sleeve 35 that are screwed into the boss 33. A name plate 46 and a terminal plate 48a for external connection are fixed together with screws 47, while on the right side of the wiring board 42b there is a terminal for connecting the wiring to the attached temperature sensor. A plate 48b is fixed.

In addition, the upper and front and rear open surfaces of the base plate 11 are
A cover 51 made of a metal plate or the like is applied from above to cover all but the outside of both side surfaces 13a and 13b, and the cover 5 is attached by screws 52.
1 is to be locked.

FIG. 2 shows the details of the base plate 11, A is a plan view, B is an X-Y sectional view at A, and C is a front view with a main part cut away.
15b are provided with screw holes 15c and 15d, while the bottom portion 12 is provided with a reinforcing linear punch 19.
A is formed radially around the connecting part 14,
Corner punches 19B for reinforcement are also formed at the boundaries between the bottom surface 12 and both side surfaces 13a and 13b, and a circular punch 19C for mounting the power transformer 41 is formed on the bottom surface 12. ing.

Further, a metal fitting 20 having a chevron-shaped embossment 19D is fixed by welding or the like to the upper outer side of the side surface portion 13b, and a similar embossment (not shown in the figure) provided at an opposing portion of the cover 51 allows the cover 51 to be fixed. It is possible to seal it after installation.

FIG. 3 shows the details of the brackets 21a and 21b, A is a front view and B is an X-Y sectional view at A. The bracket 21 made of sheet metal includes:
Symmetrical protrusions 22 are formed on both ends by bending, and after punching from the upper surface side, screw holes 23 are drilled, and the same bracket 21
is the bracket 21 in FIGS. 1 and 2.
a, 21b.

FIG. 4 shows the details of the shield plate 31, A is a plan view, B is an X-Y sectional view at A, and C is a front view. 33 is implanted by welding or the like, and a through hole 37 corresponding to the screw hole 23 of the brackets 21a, 21b is bored, and the side surface portion 13
On the side opposite to a, 13b, there are notches 32a,
32b are formed in parallel, and an insulating material 38 shown by a chain line is adhered thereto.

Further, a downwardly bent portion 39 is formed on the left side, and a terminal plate 48a and a name plate 46 shown in FIG. 1 are fixed through screw holes 36B of this portion.

Therefore, according to the above configuration, it is possible to construct a converter that is lightweight, inexpensive, and has high strength, and by removing the plug 44 and the screw 24, the shield plate 31 and the wiring board can be removed. 42
a and 42b can be removed as a unit, making wiring work at the installation site and maintenance, inspection, and adjustment of the electronic circuit easy.

Note that the lead wire from the detector is also drawn out through the through hole in the connecting part 16 and connected by the plug 44, so that the converter and the detector can be connected by screwing back the set screws 15a and 15b. can be freely separated.

However, the shape of the base plate 11 is not limited to a rectangular shape, and can be arbitrarily selected according to conditions.
The same effect can be obtained even if the two protrusions 22 are not provided in 1a and 21b, and the bracket is separated for each protrusion 22.
Various modifications are possible.

[Effect of idea]

As is clear from the above description, the present invention has a simple and inexpensive structure, is lightweight and has high strength, is easy to maintain, inspect, and adjust, and can be converted without any electrical or thermal problems. As a result, great effects can be obtained in electromagnetic calorimeters, electromagnetic flowmeters, differential pressure transmitters, etc. for indoor use or similar applications.

[Brief explanation of the drawing]

The figures show an embodiment of the present invention. Figure 1 is a converter, A is a plan view of the cover with the ceiling removed, B is a cutaway side view of the main parts, and C is a front view of the cover with the front removed. 2 shows details of the base plate, FIG. 3 shows details of the bracket, and FIG. 4 shows details of the shield plate. 11... Base plate, 12... Bottom part, 13a, 13
b... Side part, 14... Connection part, 21a, 21b
... Bracket, 22 ... Protrusion, 23 ... Screw hole, 24 ... Screw, 31 ... Shrinkage plate, 32
a, 32b...Notch, 41...Power transformer, 4
2a, 42b...wiring board, 51...cover.

Claims (1)

[Scope of utility model registration request] A base plate made of a metal plate formed by bending both side parts from the bottom part into a U-shape and having a pipe-shaped connecting part protruding downward from the bottom part; brackets that are fixed to face each other and have protrusions that protrude inward and are provided with screw holes; and brackets that are fixed to the protrusions with screws and partition the inside of the base plate substantially horizontally, and that are connected to the insides of both side parts. A shield plate made of metal and having a notch for wiring therebetween; an electronic component that generates heat and leakage magnetic flux provided on the bottom side of the shield plate; and an upper surface of the shield plate. A structure of a converter comprising an electronic circuit provided on the side and a cover covering the open surface of the base plate except for the outside of both side surfaces.