JPH0548846B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a measuring tube for an electromagnetic flowmeter suitable for use as a measuring tube for a sanitary electromagnetic flowmeter, for example.

[Prior Art] Conventionally, this type of measuring tube for an electromagnetic flowmeter has been constructed as shown in FIG. To explain this based on the same figure, in the same figure, the reference numeral 1 is a stainless steel pipe member, and flanges 2 (only one shown) for connecting pipes are provided at both ends of the pipe member. A step portion 4 having an annular dovetail groove 3 is provided on the end surface 2a. Reference numeral 5 denotes a lining made of Teflon (trade name) or the like, which covers the inner wall 1a of the tube member 1 and the end faces 2a of both the flanges. Reference numeral 6 denotes an annular gasket groove, which is formed in the lining 5 on both the flange end faces 2a. Reference numeral 7 denotes a tubular reinforcing member having a large number of through holes 7a, which is embedded in the lining 5 on the inner wall 1a of the tubular member 1.

[Problem that the invention seeks to solve]

By the way, in this type of measurement tube for an electromagnetic flowmeter, since a synthetic resin material is usually used as the lining 5, the lining 5 after molding is
Due to shrinkage, the lining 5 on the flange end surface 2a shifts toward the inside of the tube, as shown by the two-dot chain line in FIG.
A gap shown by A in the figure is formed between the upper lining 5 and the upper lining 5. As a result, there is a risk that the fluid to be measured may enter the gap during cleaning of the measuring tube, or that dust may enter during use, leading to the propagation of various bacteria. There was also the problem of poor appearance.

[Means for solving problems]

The measuring tube for an electromagnetic flowmeter according to the present invention is composed of a tube member having flanges at both ends and the end faces of both flanges and the inner wall thereof being covered with a lining, and the flange is attached to a portion of the end face of the flanges corresponding to the lining end portion. A protrusion is integrally formed with the lining and is embedded in the lining to lock the end of the lining.

Further, a measuring tube for an electromagnetic flowmeter according to another aspect of the present invention is composed of a tube member having flanges at both ends, and the end surfaces of both flanges and the inner wall thereof are covered with a lining, and the end surfaces of both flanges of the tube member are provided with an outer lining. An annular plate whose peripheral edge is bent toward the side opposite to the flange and is embedded in the lining is provided, and at a portion of both flanges facing the outer peripheral edge of the lining, the plate gradually curves toward the inside of the tube as it goes toward the side opposite to the flange. A sloped surface extending to the top is formed.

The present invention was made in view of the above circumstances, and it is an object of the present invention to provide a measuring tube for an electromagnetic flowmeter that is excellent in terms of hygiene and appearance.

[Effect]

In the present invention, protrusions that lock the lining end portions on the flange end faces are provided on both flanges of the pipe member, or an annular plate that is buried in the lining is provided on both flange end faces of the pipe member, and the outer surface of the annular plate is provided. Since the peripheral edge is bent toward the opposite side of the flange, it is possible to prevent the lining from shifting toward the inside of the tube due to molding shrinkage.
No gap is formed between the lining and the flange.

〔Example〕

FIG. 1 is a cross-sectional view showing a measuring tube for an electromagnetic flowmeter according to the present invention. In this figure, the same members as in FIG. In the figure, what is indicated by the reference numeral 21 is an annular protrusion that locks the lining end portion on the flange end surface 2a, that is, within the step portion 4, and is located outside the dovetail groove 3 and is located at the step portion 4 of the flange 2. This allows the lining 5 to be attached to the inside of the tube, that is, in the direction shown by the arrow in the figure, after the lining is formed.
prevents it from shifting.

In the measurement tube for an electromagnetic flowmeter configured in this way, since the protrusions 21 are provided on both flanges 2 of the tube member 1 to lock the lining end portions on the flange end surface 2a, the inner side of the tube due to molding shrinkage of the lining 5 This prevents the lining from shifting, and no gap is formed between the lining 5 and the inner wall 4a of the stepped portion 4.

In this embodiment, an example is shown in which the flange 2 is provided with a stepped portion 4 on the flange end surface 2a, that is, a pipe member 1 having a ferrule, but the present invention is not limited to this. , it is also applicable to the ordinary tube member 22 shown in FIG. In this case, by providing the protrusions 24 on the end surface 23a of the flange 23, the shrinkage of the lining 25 on the flange end surface 23a is eliminated, so that machining of the lining 25, which is conventionally required after lining molding, is no longer necessary.

Furthermore, in this embodiment, the protrusion 21 simply protrudes above the step portion 4 of the flange 2; however,
The present invention may have a structure in which the projections 26 are inclined outward as shown in FIG. In this case, the pipe member 27
A groove 30 is formed between the inner wall 29a of the stepped portion 29 provided in the ferrule 28 and the protrusion 26.

Further, in this embodiment, an example was shown in which the protrusion 21 is provided on the flange 2 of the pipe member 1 to prevent the lining 5 from shifting toward the inside of the pipe, but the present invention is not limited to this, and FIG. As shown in FIG. 3, an annular plate 35 that is buried in the lining 34 is provided on the stepped portion 33 of the ferrule 32 of the tube member 31 by welding such as spot welding, and the outer peripheral edge of the annular plate 35 is folded into a flap shape. Even if it is bent on the side opposite to the flange so as to have a curved portion, the same effect as in the embodiment can be obtained. In this case, by forming an annular notch groove 36 in the inner wall 33a of the step portion 33, a groove 37 is formed between the groove wall of the notch groove 36 and the annular plate 35. Note that the groove wall of the notched groove 36 is an inclined surface that gradually extends toward the inner side of the tube from the stepped portion 38 toward the side opposite to the flange. That is, the lining 34 on the stepped portion 33 tends to shift toward the inner side of the tube due to molding shrinkage, and also tends to peel off toward the side opposite to the flange, but at that time, the outer peripheral edge of the lining 34 does not fit into the notch groove 36. The groove wall (inner wall 33a of the stepped portion 33) comes into contact with the groove wall. Therefore, it is possible to prevent the lining 34 from not only shifting toward the inner side of the tube but also from peeling off toward the side opposite to the flange. Here, by using a punching plate as the annular plate 35, the lining 34 near the annular plate 35 can be further reinforced.

〔Effect of the invention〕

As explained above, the first aspect of the present invention is that the flange is formed integrally with the flange at a portion corresponding to the lining end on both flange end faces of the pipe member, and is embedded in the lining to lock the lining end. Since the protrusion is provided, the second invention also provides an annular plate whose outer peripheral edge is bent toward the side opposite to the flange and is embedded in the lining, on both flange end faces of the pipe member, and Since an inclined surface that gradually extends toward the inner side of the tube as it goes toward the opposite side of the flange is formed at the portion facing the outer peripheral edge of the lining, it is possible to prevent the lining from shifting toward the inner side of the tube due to molding shrinkage, and to prevent the lining from shifting toward the inside of the tube due to molding shrinkage. No gaps are formed between them. Therefore, there is no risk of bacteria propagating due to the fluid to be measured or dust, unlike in the conventional case, and the appearance is also very good.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a measuring tube for an electromagnetic flowmeter according to the present invention, FIG. 2 is a sectional view showing another first embodiment, FIG. 3 is a sectional view showing another second embodiment, and FIG. 4
The figure is a sectional view showing another third embodiment, and FIG. 5 is a sectional view showing a conventional measuring tube for an electromagnetic flowmeter. DESCRIPTION OF SYMBOLS 1... Pipe member, 1a... Inner wall, 2... Flange, 2a... Flange end surface, 5... Lining,
21...Tsuko.

Claims (1)

[Scope of Claims] 1. Consisting of a tube member having flanges at both ends, the end faces and inner walls of both flanges are covered with a lining, and a pipe member integrally formed with the flange is provided at a portion corresponding to the lining terminal end on the end faces of the flanges. A measuring tube for an electromagnetic flowmeter, characterized in that it is provided with a protrusion that is buried in the lining and locks the end portion of the lining. 2 Consisting of a tube member having flanges at both ends and having both flanges end faces and inner walls covered with a lining, the outer peripheral edge of both flange end faces of this pipe member is bent toward the side opposite to the flange, and is buried in the lining. A measuring device for an electromagnetic flowmeter, characterized in that an annular plate is provided in the flanges, and an inclined surface is formed in a portion of each of the flanges facing the outer peripheral edge of the lining that gradually extends toward the inside of the tube as it goes toward the side opposite to the flange. tube.