JP2002005704A - Electromagnetic flowmeter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inexpensive electromagnetic flowmeter easy to assemble and capable of obtaining stable continuity even if a heat cycle is applied. SOLUTION: This electromagnetic flowmeter is equipped with an earth electrode provided in a measuring tube, an earth pattern provided on the peripheral surface of the measuring tube and connected to the earth electrode at its one side, and a cylindrical tube provided so as to cover the measuring tube, and as its feature, it is also equipped with a connecting body electrically connected to the other end of the earth pattern provided on the peripheral surface of the measuring tube and to the cylindrical tube while having conductivity and elasticity.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides stable conduction even when a heat cycle is applied, and is easy to assemble.
It relates to an inexpensive electromagnetic flowmeter.

[0002]

2. Description of the Related Art FIG. 10 is an explanatory diagram of a configuration of a conventional example generally used conventionally, and FIG. 11 is an explanatory diagram of a main portion configuration of FIG.

In FIGS. 10 and 11, reference numeral 1 denotes a measuring tube through which a measuring fluid flows. Reference numeral 2 denotes a measurement electrode provided in the measurement tube 1. Reference numeral 3 denotes an earth electrode provided on the measuring tube 1.

[0004] Reference numeral 4 denotes a cylindrical tube provided to cover the measuring tube 1. Reference numeral 5 denotes two fastening rings, each of which has the measuring tube 1 sandwiching the cylindrical tube 4 therebetween.
Mounted on Reference numeral 6 denotes an O-ring that seals the measuring tube 1 and the fastening ring 5.

[0005] Reference numeral 7 denotes an earth pattern provided on the outer peripheral surface of the measuring tube 1 and one end of which is connected to the earth electrode 3. FIG. 5 shows a state in which the cylindrical tube 4 and the fastening ring 5 have been removed. In this case, the ground pattern 7 is made of a platinum paste.

Reference numeral 8 denotes the other end of the ground pattern 7 and the measuring tube 1
At the same time, an electrical connection between the ground pattern 7 and the cylindrical pipe 4 is also secured at the cast-in portion where the cylindrical ring 4 is fastened to the cylindrical pipe 4. The cast-in portion 8 is formed by pouring a molten metal. For example, aluminum or the like is used.

[0007]

However, such an apparatus has the following problems. (1) In the cast-in part 8, a nitrogen atmosphere furnace, for example, is required to fasten the molten metal so as not to oxidize the molten metal, and a large cost is required for capital investment.

(2) The furnace installation time is, for example, about 24H, which takes a long time to manufacture. In addition, the power consumption is very high.

(3) The molten metal in the cast-in portion 8 has a greatly different linear expansion coefficient from that of, for example, the measuring tube 1 made of ceramic, and thus may be exfoliated when a heat cycle is applied. It can be a defect.

[0010] An object of the present invention is to solve the above-mentioned problems, and to provide an inexpensive electromagnetic flowmeter which can achieve stable conduction even when a heat cycle is applied, is easy to assemble, and is inexpensive.

[0011]

In order to achieve the above object, according to the present invention, there is provided an electromagnetic flowmeter according to the present invention, wherein an earth electrode provided on a measuring tube and an outer peripheral surface of the measuring tube are provided. In an electromagnetic flowmeter including a ground pattern provided and one end side connected to the ground electrode, and a cylindrical tube provided to cover the measurement tube, the other end of the ground pattern provided on an outer peripheral surface of the measurement tube And a connection member electrically connected to the cylindrical tube and having a conductivity and elasticity.

According to a second aspect of the present invention, in the electromagnetic flow meter according to the first aspect, the connection body is a braided wire.

According to a third aspect of the present invention, in the electromagnetic flow meter according to the first aspect, the connecting member is formed in a pipe shape.

According to a fourth aspect of the present invention, in the electromagnetic flow meter according to the first aspect, the connection body is a coil-shaped body.

According to a fifth aspect of the present invention, in the electromagnetic flow meter according to the first aspect, the connection body is made of conductive rubber.

According to a sixth aspect of the present invention, in the electromagnetic flow meter according to the first aspect, the connection body is a conductive silicone body.

According to a seventh aspect of the present invention, in the electromagnetic flow meter according to the first aspect, the connection body has a conductive adhesive having elasticity.

According to an eighth aspect of the present invention, in the electromagnetic flow meter according to the first aspect, the connecting body forms a ring along the outer peripheral surface of the measuring tube.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. FIG. 1 is an explanatory diagram of a main part configuration of an embodiment of the present invention,
FIG. 2 is an explanatory diagram of a main part configuration in FIG. 1, and FIG. 3 is an explanatory diagram of parts in FIG. In the figure, the configuration of the same symbol as FIG. 4 represents the same function. Hereinafter, only differences from FIG. 4 will be described.

In the figure, a connector 11 is provided on the outer peripheral surface of the measuring tube 1 and is electrically connected to the other end of the ground pattern 7 and the cylindrical tube 4 and has conductivity and elasticity. In this case, as shown in FIG. 3, a braided wire 11 is used.

In this case, as shown in FIG. 1, the contact with the ground pattern 7 can be easily obtained.
The braided wire 11 has a ring shape along the outer peripheral surface of the measuring tube 1.

In the above configuration, the electrical connection between the earth pattern 7 led from the earth electrode 3 on the measuring tube 1 and the cylindrical tube 4 is replaced by the conventional cast-in portion 8, and the conductivity and elasticity are changed. A connecting body 11 having a braided wire 11 in this case was used.

As a result, (1) the earth pattern 7 on the measuring tube 1 and the metal tube 4
By using the braided wire 11 in the electrical connection part, the difference in the coefficient of linear expansion between the measurement tube 1 and the metal tube 4 can be absorbed even when a heat cycle is applied, and a stable conduction can be obtained. A flow meter is obtained.

(2) This assembling is very easy, there is no need to use a nitrogen furnace as in the case of the conventional cast-in part 8, no high cost is required for capital investment, and the electromagnetic flow rate can be manufactured at low cost. The total is obtained.

(3) An inexpensive electromagnetic flowmeter can be obtained without requiring a long time in the furnace and, therefore, without using much power.

(4) Since the connecting body 11 is a braided wire, the connecting body 11 is composed of a large number of electric wires, elasticity and a large number of contacts are generated, and an electromagnetic flowmeter in which contacts can be reliably obtained is obtained.

(5) As shown in FIG. 1, since the braided wire 11 has a ring shape along the outer peripheral surface of the measuring tube 1, a contact with the ground pattern 7 can be easily obtained, and it is easy to assemble and inexpensive. A simple electromagnetic flow meter can be obtained.

FIG. 4 is an explanatory view of a main part configuration of another embodiment of the present invention. In this embodiment, as shown in FIG. 4, the connecting body 12 is in a pipe shape. Since the connecting body 11 is in the shape of a pipe, an electromagnetic flowmeter that can firmly maintain elasticity and reliably obtain a contact can be obtained.

FIG. 5 is an explanatory view of a main part of another embodiment of the present invention, and FIG. 6 is a plan view of FIG. In this embodiment, as shown in FIGS. 5 and 6, the connection body 13 is a coil-shaped body.

As a result, since the connecting member 14 is a coil-shaped member, the connecting member 14 can be elastically provided in the lateral direction and can be freely bent in the longitudinal direction. An electromagnetic flowmeter that is suitable for winding around the gap with the cylindrical tube 4, can be assembled at low cost, and can reliably obtain a contact can be obtained.

The connecting member has a U-shaped cross section as shown in FIG. 7, and a corrugated shape 1 as shown in FIG.
5. As shown in FIG. 9, the cross section may have a spiral shape 16 or the like.

Note that, instead of the connection body 11, a rubber having conductivity or a conductive silicone body may be used. If the connection body 11 is made of conductive rubber, it is easy to assemble and deform freely, and an inexpensive electromagnetic flowmeter can be obtained.

If the connecting body 11 is a conductive silicone body, the silicone is resistant to high temperatures and an electromagnetic flow meter with improved heat resistance can be obtained. Further, the connection body 11 may include a conductive adhesive having elasticity.

If the conductive adhesive has elasticity, the connecting body 11 may be filled with a conductive adhesive. Since the connecting body 11 has an elastic conductive adhesive, even if the connecting body 11 is reduced in elasticity due to high temperature or the like, the connecting body 11 has adhesiveness, so that stable conduction can be obtained.

Further, when used at a high temperature, the surface of the connection body 11 may be oxidized, and the conduction may be reduced.
If the surface is covered with the conductive adhesive, the electrical connection is stably maintained.

In the above embodiment, the braided wire 1
Although it has been described that 1 has a ring shape along the outer peripheral surface of the measuring tube 1, the ring shape does not necessarily have to be closed, like a ring, and both ends may be separated. In short, it is only necessary that the braided wire 11 can easily contact the ground pattern 7.

The foregoing description has set forth only certain preferred embodiments for purposes of explanation and illustration of the invention. Therefore, the present invention is not limited to the above-described embodiment, but includes many more changes and modifications without departing from the spirit thereof.

[0038]

As described above, according to the first aspect of the present invention,
According to the above, the following effects are obtained. (1) The use of a connector in the electrical connection between the earth pattern on the measurement tube and the metal tube tube allows the linear expansion coefficient between the measurement tube and the metal tube tube to be increased even when a heat cycle is applied. An electromagnetic flowmeter that can absorb the difference and obtain stable conduction can be obtained.

(2) This assembling is very easy, and there is no need to use a nitrogen furnace as in the conventional cast-in part,
It is possible to obtain an electromagnetic flowmeter which can be manufactured at a low cost without requiring a large amount of capital investment.

(3) An inexpensive electromagnetic flowmeter can be obtained without requiring a furnace-loading time and without using much power.

According to the second aspect of the present invention, the following effects can be obtained. Since the connection body is a braided wire, the connection body is composed of a large number of electric wires, elasticity and a large number of contacts are generated, and an electromagnetic flowmeter in which the contacts are reliably obtained is obtained.

According to the third aspect of the present invention, the following effects can be obtained. Since the connection body is in the shape of a pipe, an electromagnetic flowmeter can be obtained in which the elasticity can be held firmly and the contact can be reliably obtained.

According to the fourth aspect of the present invention, the following effects can be obtained. Since the connecting body is a coiled body, it can be elastic in the side direction and bend freely in the length direction, so that it can be wound around the gap between the cylindrical measuring tube and the cylindrical tube. It is possible to obtain an electromagnetic flowmeter which is suitable, can be assembled at a low cost, and can reliably obtain a contact.

According to the fifth aspect of the present invention, the following effects can be obtained. Since the connection body is made of conductive rubber, it is easy to assemble and easily deform, and an inexpensive electromagnetic flowmeter can be obtained.

According to the sixth aspect of the present invention, the following effects can be obtained. Since the connection body is a conductive silicone body, silicone is resistant to high temperatures, and an electromagnetic flowmeter with improved heat resistance can be obtained.

According to the seventh aspect of the present invention, the following effects can be obtained. Since the connection body has a conductive adhesive having elasticity, even if the connection body has reduced elasticity due to high temperature or the like, the connection body has adhesiveness, so that stable conduction can be obtained.

When the connector is used at a high temperature, the surface of the connection body may be oxidized and the conduction may be reduced. However, if the surface is covered with the conductive adhesive, the electrical connection is stably maintained. Dripping.

According to the eighth aspect of the present invention, the following effects can be obtained. Since the connecting body forms a ring along the outer peripheral surface of the measuring tube, a contact with the ground pattern can be easily obtained, and an inexpensive electromagnetic flowmeter which is easy to assemble can be obtained.

Therefore, according to the present invention, stable conduction can be obtained even when a heat cycle is applied, and an inexpensive electromagnetic flowmeter which is easy to assemble can be realized.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a main part configuration of an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a main part configuration of FIG. 1;

FIG. 3 is an explanatory view of parts shown in FIG. 1;

FIG. 4 is an explanatory diagram of a main part configuration of another embodiment of the present invention.

FIG. 5 is an explanatory diagram of a main part configuration of another embodiment of the present invention.

FIG. 6 is a plan view of FIG. 5;

FIG. 7 is an explanatory view of a main part configuration of another embodiment of the present invention.

FIG. 8 is an explanatory diagram of a main part configuration of another embodiment of the present invention.

FIG. 9 is an explanatory diagram of a main part configuration of another embodiment of the present invention.

FIG. 10 is an explanatory diagram of a configuration of a main part of a conventional example generally used in the related art.

FIG. 11 is an explanatory diagram of a main part configuration of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Measuring tube 2 Measuring electrode 3 Earth electrode 4 Cylindrical tube 5 Fastening ring 6 O-ring 7 Earth pattern 11 Connector 12 Connector 13 Connector 14 Connector 15 Connector 16 Connector 16

Claims (8)

[Claims] 1. An earth electrode provided on a measuring tube, an earth pattern provided on an outer peripheral surface of the measuring tube, one end of which is connected to the earth electrode, and a cylindrical tube provided to cover the measuring tube. An electromagnetic flowmeter provided, comprising: a connector having conductivity and elasticity, which is provided on the outer peripheral surface of the measurement tube and is electrically connected to the other end of the ground pattern and the cylindrical tube. Electromagnetic flow meter. 2. The electromagnetic flow meter according to claim 1, wherein the connection body is a braided wire. 3. The electromagnetic flow meter according to claim 1, wherein said connecting member is in a pipe shape. 4. The electromagnetic flowmeter according to claim 1, wherein said connection body is a coil-shaped body. 5. The electromagnetic flow meter according to claim 1, wherein said connection body is made of conductive rubber. 6. The electromagnetic flow meter according to claim 1, wherein the connection body is a conductive silicone body. 7. The electromagnetic flow meter according to claim 1, wherein the connection body has a conductive adhesive having elasticity. 8. The electromagnetic flowmeter according to claim 1, wherein the connecting member forms a ring along the outer peripheral surface of the measuring tube.