JPS5916622A - Method of forming pipe lining - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of forming a pipe lining provided with a reinforcing member.

For example, a measuring tube used in an electromagnetic flowmeter or the like is lined with an insulating material.

This type of lining may peel off from the pipe when external pressure is applied to the pipe when the inside of the pipe is exposed to low pressure, particularly atmospheric air, or even a vacuum, during use.

For this reason, in order to form a pipe lining that can withstand external pressure, conventionally, a rectangular punching plate rolled into a cylindrical shape or a pipe shape is used as a reinforcing member, and this reinforcing member is formed by molding. A coating method is used.

However, in the former case, when a rectangular punching plate is formed into a cylindrical shape with a predetermined diameter in consideration of the dimensional tolerance of the inner diameter of the pipe, the length in the circumferential direction is insufficient as shown in Figure 1. As a result, a slit 2 may be formed between the circumferential edges 1a and lb of the reinforcing member 10. The lining using the reinforcing member 1 constructed in this manner has the drawback that it peels off from the pipe at the slit portion, resulting in a measurement error in flow rate measurement. On the other hand, even in the latter case, the reinforcing member must be machined taking into account the dimensional accuracy of the cylinder diameter.
There are disadvantages in that the processing work is complicated and the cost is high.

The invention was made in view of these circumstances, and involves forming a perforated tube by winding a perforated plate formed in a parallelogram shape into a cylinder, and then relatively shifting both circumferential edges in the axial direction. The present invention provides a method for forming a lining inside a pipe that can prevent the lining from peeling off from the pipe by embedding the porous pipe in the lining in closer contact with each other. The configuration and the like will be explained in detail below with reference to embodiments shown in the drawings.

FIG. 2 is a partially cutaway perspective view showing a lining structure according to the invention; FIG. 3 is a perspective view showing an embodiment of a perforated plate;
Figures 4 and 5 show a perforated tube, and are perspective views before and after the edges are brought together, respectively. In these figures, 11 is a tube used for an electromagnetic flow needle, and flanges 12 are formed at both ends. Reference numeral 13 denotes a lining that lines the entire inner wall of the tube 11, and a cylindrical porous tube 15 having a large number of holes 14 is embedded therein by molding. As shown in FIG. 5, this porous tube 15 has the same end edges 16 and 1 so as to close the slit 1B formed between the circumferential edges 16 + 17 of the porous tube 15a shown in FIG.
7 are closely spaced by being relatively shifted in the axial direction. As a result, the porous tube 15 is
By reinforcing the tube 11, the tube 11 can withstand external pressure regardless of changes in the flow rate flowing through the tube 11.
This prevents the parts in close contact with the lining 13 from separating.

In addition, as shown in FIGS. 3 and 4, the porous pipe 15a is
Perforated plate 19 formed into a parallelogram shape with sides having an inclination angle θ
It is formed by winding it into a cylindrical shape.

Next, a method for manufacturing a pipe lining with the above structure will be explained.

As shown in FIG. 3, the perforated plate 19 is formed into a parallelogram shape, and as shown in FIG.
form. In this state, the perforated pipe 15a has a slit 18 formed between the circumferential edges 16 and 17, so after inserting the perforated pipe 15& into the pipe 11, one end edge 16 is The axial direction indicated by X or the other end edge 17 is the axial direction indicated by arrow Y in the figure
6.17 is relatively shifted in the axial direction to bring both end edges 16.17 of 9 into close contact to form the porous tube 15. This perforated tube 15 can then be covered by molding to produce the lining 13.

In addition, if the parallelogram-shaped perforated plate 19 according to the invention is used, simply by relatively shifting the edges 16 and 17 of the perforated tube 15a formed by winding the perforated plate 19 into a cylindrical shape.
It is possible to form a porous tube 15 in which the slit 18 is absorbed and which has an inner diameter equal to the inner diameter of the porous tube 15a. The tabs 16a and 17a that protrude by shifting the end edges 16 and 17 during the formation of the porous tube 15 may be embedded in the lining 13, or may be shaved. Further, the inclination angle θ of the inclined side of the perforated plate 1B shown in FIG. 3 and the length of the base may be set according to the size of the inner diameter of the tube 11.

As explained above, according to the present invention, both ends of the perforated pipe in the circumferential direction are brought into close contact with each other by relatively shifting, and the perforated pipe is coated on the inner wall of the pipe by molding, so that external pressure is not applied to the pipe. Even if the lining is damaged, it is possible to reliably prevent the lining from peeling off from the pipe. Therefore, if the present invention is applied to a measuring tube such as an electromagnetic flowmeter, the lining and the measuring tube maintain close contact, so that no measurement error occurs in flow rate measurement. Furthermore, there is no need for the complicated processing work of machining a pipe-shaped reinforcing member in consideration of dimensional accuracy as in the past, and it is possible to obtain a lining provided with an extremely economical reinforcing member.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a conventional perforated pipe, FIG. 2 is a partially cutaway perspective view showing a lining structure according to the present invention, FIG. 3 is a perspective view showing an embodiment of a perforated plate, fourth and FIG. 5 shows a perforated tube, and is a perspective view before and after the edges are brought together, respectively. In 11! 9-tube, 13evev lining, 15115
ae*-=porous tube, 16,179? -Middle edge, 19 in.
・! perforated plate. Patent applicant Yamatake Newell Co., Ltd. Agent
Masaki Yamakawa (and 1 other person) Procedural amendment (voluntary) Commissioner of the Japan Patent Office MlfO* 57. i
111 1981 Patent Application No. 125299 2, Title of the invention 3, Relationship with the case of the person making the amendment Patent Applicant name (name)
(666) Yamatake Honeywell Co., Ltd. 5, amend "method to be corrected" to "forming method of pipe lining in electromagnetic flowmeter". amend the entire text of the specification to include the attached specification. Description 1, Title of the invention: Method for forming a pipe lining in an electromagnetic flowmeter 2, Claims: A perforated pipe is formed by winding a perforated plate as a reinforcing material embedded in the lining into a cylindrical shape so that it can be inserted into the pipe. is formed, and after inserting it into the pipe, the both circumferential edges are relatively shifted in the axial direction to bring the two edges into close contact with each other,
A method for forming a lining inside a pipe in an electromagnetic flowmeter, which comprises then covering the porous pipe by molding. 1 Detailed Description of the Invention The present invention relates to a method of forming a pipe lining in an electromagnetic flowmeter equipped with a reinforcing member. A measuring tube used in an electromagnetic flowmeter is lined with an insulating material. This type of lining may peel off from the pipe when external pressure is applied to the pipe when the inside of the pipe becomes under low pressure, especially below atmospheric pressure or even vacuum, during use. For this reason, in order to form a pipe lining that can withstand external pressure, conventionally, a punching plate formed in a rectangular shape is rolled into a cylindrical shape or made into a pipe shape as a reinforcing member. A method is adopted in which the method is used to obtain information. However, in the case of the former, the punching plate is formed into a rectangular shape taking into consideration the dimensional tolerance of the pipe inner diameter. is insufficient and the circumferential edge 1ayl of the reinforcing member 10
A slit 2 may occur between b. The lining using the reinforcing member 1 constructed in this manner has the disadvantage that it peels off from the pipe at the slit portion, resulting in a measurement error in flow rate measurement. - Even if it is temporary, the entire reinforcing part # must be machined taking into consideration the dimensional accuracy of the cylinder diameter, so the machining work is complicated and there is an inconvenience that the mast height increases even if it is plentiful. The present invention was developed in consideration of these circumstances, and involves forming a perforated pipe by winding a perforated plate into a cylindrical shape, and then relatively shifting both circumferential edges in the axial direction. The present invention provides a method for forming a lining inside a tube in an electromagnetic flow needle, which can prevent the lining from peeling off from the tube by embedding the porous tube in close contact with the lining. The configuration and the like will be explained in detail below with reference to embodiments shown in the drawings. FIG. 2 is a partially cutaway perspective view showing a lining structure according to the present invention, and FIG. 3 is a perspective view showing an embodiment of a perforated plate.
Figures 4 and 5 show a perforated tube, and are perspective views before and after the edges are brought together, respectively. In these figures, 11 is a tube used in an electromagnetic flowmeter, and flanges 12 are formed at both ends. Reference numeral 13 denotes a lining which extends over the entire inner wall of the tube 1, into which a cylindrical porous tube 15 having a large number of holes 14 is embedded by molding. As shown in FIG. 5, this perforated pipe 15 is similar to the perforated pipe 15 shown in FIG. The same end edges 16 and 17 are arranged so as to close the slit 18 formed between the circumferential end edges 16 and 17.
They are formed in close contact with each other by being shifted in the axial direction relative to each other. 2- Accordingly, the porous pipe 15 is reinforced with the pipe 11t.
The pipe 11 is able to withstand external pressure without being affected by changes in the flow rate flowing therein, and prevents the part of the pipe 11 and the lining 13 from coming apart. In addition, the porous pipe 15
As shown in FIGS. 3 and 4, a perforated plate 19f is formed into a parallelogram shape with sides having an inclination angle θ: it is formed by winding it into a cylindrical shape. Next, a method for manufacturing a pipe lining in an electromagnetic flowmeter having the above configuration will be described. As shown in FIG. 3, the perforated plate 1B is formed into a parallelogram shape, and as shown in FIG.
form. In this state, since the slit 18 is formed between the circumferential edges 16 and 17 of the perforated pipe 15a, the perforated pipe 15a. After inserting into the tube 11, one end edge 16Yt is moved in the axial direction shown by arrow X in FIG. 4, or the other end edge 17 is moved in the axial direction shown by arrow Y in FIG. By shifting the tube in the axial direction, both end edges 16 and 17 of the tube are brought into close contact with each other to form a porous tube 15. Next, the lining 13 can be manufactured by covering the perforated tube 15 by molding. Note that the present invention provides a system slit 18 whose winding diameter can be changed by simply shifting the end edges 16° 17 of the perforated tube 15a formed by winding the rectangular perforated plate 19 into a cylindrical shape.
A porous tube 15 having a predetermined winding diameter can be obtained by absorbing the . When forming this porous tube 15, the edges 16, 17
't Protruding ear pieces by shifting 16. , 17a
may be embedded in the lining 13 or may be scraped off. Further, the inclination angle θ of the inclined side of the perforated plate 19 shown in FIG. 3 and the length of the base may be set according to the thickness of the inner diameter of the tube 11. As explained above, according to the present invention, both ends of the perforated pipe are brought into close contact with each other by being shifted relative to each other, and the perforated pipe is coated on the inner wall of the fort by molding, so that external pressure is not applied to the pipe. To obtain an electromagnetic flowmeter that can maintain close contact between a lining and a measuring pipe even when the lining is exposed to water, completely prevent separation of the lining from the pipe, and that does not cause measurement errors in flow rate measurement. Can be done. Moreover, there is no need for the complicated processing work δ of processing a pipe-shaped reinforcing member with consideration for dimensional accuracy as in the past, and it is possible to obtain a lining with an extremely economical reinforcing member. 4. Brief description of the drawings Fig. 1 is a perspective view showing a conventional perforated pipe, Fig. 2 is a partially cutaway perspective view showing a lining structure according to the present invention, and Fig. 3 is an example of a perforated plate. Plan 1 view shown, 4th and 5th
The figure shows a perforated tube system, and is a perspective view of the front and rear edges, respectively. 1'111@@@tube, 13 competition,...ya lining, 15,
i5. @* * m perforated tube, 16.17 --- one end edge,
19 contest...Φ perforated plate.

Claims (1)

[Claims] A perforated plate as a reinforcing material to be buried in the lining is formed into a parallelogram shape, and this perforated plate is wound into a cylindrical shape so that it can be inserted into the pipe to form a perforated pipe. After this is inserted into the pipe, 1. A method for forming a pipe lining, which comprises: bringing both circumferential ends into close contact with each other by relatively shifting the ends in the axial direction; and then covering the perforated pipe by molding.