JPH0219671Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a mounting structure for a pipe member suitable for use in, for example, an electromagnetic flowmeter or a flow rate control valve.

[Prior art]

An electromagnetic flowmeter is used by attaching a pipe member as a measuring pipe between the flanges of two opposing connecting pipes. In this case, the flange of the connection pipe is provided with a plurality of bolt holes through which through bolts for holding the pipe member under pressure between the two connection pipes are inserted.

Conventionally, the pipe members used in this type of electromagnetic flowmeter have been of the flange type, which has a flange with multiple bolt holes, or of the flangeless type, as shown by A in Figure 1. ing.

However, in the case of the former (flange type pipe member), when the clamping pressure is maintained between the two connecting pipes, the bolts cannot be inserted through the bolt holes of both flanges (the flange of the connecting pipe and the flange of the pipe member). Because it is a penetrating structure, even if the diameter of the pipe member and the diameter of the connecting pipe are the same, many types of pipe members can be used to accommodate the various types of connecting pipes that have flanges of different standards. was necessary. In other words, the diameter, position, and number of bolt holes in the flanges of connecting pipes differ depending on the operating pressure and various standards, so pipe members are also equipped with flanges that match the flanges of each connecting pipe. If not, it will not be possible to insert the through bolts through both flanges. As a result, not only the manufacturing cost increases, but also the number of items in stock increases. Furthermore, since the flange protrudes in the outer diameter direction of the tube member, the size increases in the radial direction, and there is a problem in that it is not possible to meet the demand for miniaturization, which has been a trend in recent years.

On the other hand, in the case of the latter (flangeless type pipe member), as shown in Fig. 2, the through bolt (not shown) is inserted only through the flange of the connecting pipe 2, so both the connecting pipes When the tube member 1 is attached between the two members, the axes of both members 1 and 2 tend to shift, and it is necessary to pay close attention to alignment. That is, if the axis of the pipe member 1 and the axis of the connecting pipe 2 are shifted from each other, these two members 1,
This is because a step is formed between the two, and this step disturbs the flow velocity distribution of the fluid to be measured during flow rate measurement, resulting in a decrease in measurement accuracy.
As a result, the installation of the tube member 1 is not only difficult, but also requires a lot of time.

The present invention was developed in view of these circumstances, and involves attaching a cylindrical elastic member divided in the circumferential direction by a notch to the circumferential surface of a through bolt inserted into the flange of the connecting pipe. However, with an extremely simple configuration in which the elastic member is brought into contact with the outer circumferential surface of the tube member, it is possible to meet the demand for miniaturization, which has been a trend in recent years, and to reduce the number of tube members in stock. The present invention also provides a mounting structure for a pipe member that can reduce the manufacturing cost of the pipe member, simplify the installation work, and shorten the time required for the installation work.

〔Example〕

Hereinafter, the configuration of the present invention will be explained in detail with reference to embodiments shown in the drawings.

FIG. 3 is a sectional view showing a tube member mounting structure according to the present invention, and FIG. 4 is a perspective view showing an elastic member used in the tube member mounting structure according to the present invention. In the figure, a flangeless type tube member 13 of an electromagnetic flowmeter is used, which is indicated by reference numeral 11. A transmitter 12 is attached above the outer peripheral surface of the tube member 13, and connecting pipes 14 (only one shown) having the same inner diameter as the inner diameter of the tube member 13 are connected to both ends. Flanges 15 protruding in the outer diameter direction are provided at the open ends of these connection pipes 14, and the same number of bolt holes 16 into which four through bolts 17 are inserted are bored in these flanges 15. . By the through bolts 17 inserted into these bolt holes 16,
The pipe member 13 is held between both the connection pipes 14 under pressure. Reference numeral 18 denotes an elastic member such as plastic rubber or nylon, which is a cylindrical body divided in the circumferential direction by notches 19 extending parallel to the axis. ing. These elastic members 18 are
By bringing the outermost elastic member into contact with the outer peripheral surface of the tube member 13, the tube member 13 can be centered with respect to the connection pipe 14.

In such a tube member mounting structure, the elastic member 18 allows the distance between the axis of each through bolt 17 and the axis of the tube member 13, and the distance between the center of the bolt hole 16 and the center of the connecting pipe 14 to be adjusted. Since the distance (bolt circle radius) can be set to be the same, the center alignment of the pipe member 13 and the connecting pipe 14 can be easily and reliably performed. In this case, since the elastic member 18 is a cylindrical body divided in the circumferential direction, a plurality of elastic members 18 having the same size can be stacked as shown in FIGS. 3 and 5.
The laminated thickness of the elastic member 18 can be adjusted depending on the distance l between the outer circumferential surface of the tube member 13 and the circumferential surface of the through bolt 17 shown in the figure. For example, if the distance between the outer circumferential surface of the tube member 13 and the circumferential surface of the through bolt 17 having an outer diameter of 22 mm is 9 mm, six elastic members 18 each having a thickness of 1.5 mm and an inner diameter of about 22 mm may be used. Here, if the elastic member 18 has dimensions of, for example, 9 mm in thickness and 22 mm in inner diameter, only one elastic member is required.

For example, if the distance l between the outer circumferential surface of the tube member 13 and the circumferential surface of the through bolt 17 with an outer diameter of 16 mm is 1.5 mm, one elastic member 18 with a thickness of 1.5 mm and an inner diameter of about 16 mm should be used. Bye.

Thereby, one type of pipe member 13 can be positioned on the same axis as many types of connection pipes 14 having flanges of different standards. In other words, only one type of pipe member 13 is required when attaching various types of connection pipes 14.

Furthermore, in this embodiment, since the tube member 13 is of a flangeless type, the radial dimension can be shortened.

Furthermore, in this embodiment, the notch 19 formed in the elastic member 18 means that the through bolt 1
The elastic member 18 can be easily attached to the elastic member 7.

In addition, since the elastic member 18 is attached using elasticity, it will not easily come off from the through bolt 17.

In this embodiment, the elastic member 18 is made of materials such as plastic rubber and nylon, but the present invention is not limited thereto, and even materials such as neoprene and soft vinyl chloride may be used. The same effects as in the embodiment are achieved.

Furthermore, although the notch 19 of the elastic member 18 in this embodiment has been shown as extending parallel to the axis, the present invention may also have a notch 20 that is curved as shown in FIG. In this case, the elastic member 18
Attachment to the through bolt 17 becomes easier.

Further, in this embodiment, a case where the present invention is applied to an electromagnetic flowmeter is shown, but the present invention can also be applied to a flow rate control valve in the same manner as in the embodiment.

Incidentally, a method for attaching the tube member 13 in this embodiment will be explained.

First, the through bolts 17 are inserted into the lower left and right bolt holes 16 of the flange 15. Next, after the elastic members 18 are attached to these through bolts 17, the tube member 13 is placed thereon and positioned between the two connecting pipes 14. At this time, the axis of the tube member 13 coincides with the axis of the connection pipe 14. After inserting the through bolts 17 into the left and right bolt holes 16 on the upper side of the flange 15, the elastic members 18 are attached to these through bolts 17, and then nuts (not shown) are inserted into the insertion ends of the through bolts 17. Screw together.

In this way, the pipe member 13 can be reliably attached between both the connecting pipes 14.

[Effect of idea]

As explained above, according to the present invention, on the circumferential surface of the through bolt inserted into the flange of the connecting pipe,
The tube member is centered by attaching a cylindrical elastic member divided in the circumferential direction by a notch and bringing this elastic member into contact with the outer peripheral surface of the tube member.
The pipe member and the connecting pipe can be easily and reliably aligned, and the installation work on the pipe member can be simplified and the time required for the installation work can be shortened. Moreover, since the elastic member is a cylinder divided in the circumferential direction, a plurality of elastic members can be stacked, and the stacking thickness of these elastic members can be adjusted. Therefore, only one type of pipe member is required during installation for multiple types of connection pipes with flanges of different standards, which reduces manufacturing costs and the number of items in stock for pipe members. It is also possible to aim for Furthermore, since a flangeless type can be used as the pipe member, the radial dimension can be shortened.
Another advantage is that it can meet the demand for miniaturization, which has been a trend in recent years.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an electromagnetic flowmeter equipped with a flangeless type pipe member, Fig. 2 is a sectional view showing the mounting structure of a conventional flangeless type pipe member,
FIG. 3 is a sectional view showing the mounting structure for a pipe member according to the present invention, FIG. 4 is a perspective view showing an elastic member used in the mounting structure for a pipe member according to the present invention, and FIG.
6 are a cross-sectional view and a schematic diagram for explaining the usage state of the elastic member, and FIG. 7 is a perspective view showing the elastic member in another embodiment. 11... Electromagnetic flowmeter, 13... Pipe member, 14...
... Connection piping, 15 ... Flange, 16 ... Bolt hole, 17 ... Through bolt, 18 ... Elastic member.

Claims (1)

[Scope of utility model registration request] A cylindrical elastic member divided in the circumferential direction by a notch is attached to the circumferential surface of a through bolt that is inserted into the flange of the connecting pipe and holds the pipe member under pressure between the connecting pipes. A mounting structure for a tube member, characterized in that the tube member is centered by bringing the member into contact with the outer peripheral surface of the tube member.