JPH0723232U - Electromagnetic flowmeter detector - Google Patents

Abstract

(57) [Summary] [Structure] The electromagnetic flowmeter detector of the present invention is fixed by fixing the insulating spacer 1 into the mounting screw hole 3 provided concentrically with the electrode shaft in the measuring tube electrode portion by screwing the screw portion 1a. Then, the electrode 4 is inserted into the electrode insertion hole 1b penetratingly formed in the insulating spacer 1 concentrically with the male thread 1a of the insulating spacer 1 and tightened. The pressure-resistant explosion-proof structure is configured by forming so as to satisfy the gap size, the screw pitch, the number of fitting threads, and the like. [Effect] The number of parts can be greatly reduced as compared with the conventional technique in which the electrode chamber is formed. Also, welding work is eliminated, workability at the time of assembling the electrode portion is greatly improved, and cost is reduced. Furthermore, since there is no welded portion, dimensional change due to thermal strain due to welding heat does not occur, and reliability in dimensional control improves.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an electromagnetic flowmeter detector having an explosion-proof structure, which is suitable for, for example, a chemical plant.

[0002]

[Prior art]

 In the measurement tube electrode part of the electromagnetic flowmeter detector equipped with an explosion-proof structure, as a means for forming a pressure-proof explosion-proof structure, conventionally, an electrode chamber satisfying the pressure-proof explosion-proof structure was formed and a signal was taken out from the hermetic terminal. Was used. That is, as shown in FIG. 3, the measuring tube electrode portion of the measuring tube 2 on which the electrode 4 is provided is attached to each of the measuring tube 2 by welding 12 a mounting base 9 and a hermetic housing 10 which are electrode chamber constituent parts. The signal line 7 from the outer end portion of the electrode 4 fixed in the hermetic housing 10 is taken out to the outside through the hermetic terminal 11. Reference numeral 6 in the drawing indicates a lining, and reference numeral 5 indicates an electrode component such as a washer, a coil spring, a signal line terminal, and a nut.

[0003]

[Problems to be solved by the device]

 In the conventional pressure-resistant and explosion-proof structure of the measuring tube electrode part, the mounting base 9 and the hermetic housing 10 are fixed to the measuring tube 2 by welding, so that there are dimensional defects due to distortion due to welding heat, uneven welding, etc. There were drawbacks such as quality control problems, a large number of parts, and high costs due to increased man-hours due to welding work.

In view of the above, the present invention provides a measuring tube electrode of an electromagnetic flowmeter detector having an explosion-proof structure with a new structure that solves the above-mentioned drawbacks while satisfying the structure required for a pressure-proof explosion-proof structure. An object is to provide an electromagnetic flowmeter detector including an electrode unit.

[0005]

Means for Solving the Problems The electromagnetic flowmeter detector of the present invention is an electromagnetic flowmeter detector having an explosion-proof structure, which comprises a measuring tube electrode section including a magnetic flux axis and an electrode axis orthogonal to the tube axis of the measuring tube. A mounting screw hole concentric with the electrode shaft, and a male screw part projecting at the center of one end screwed into the mounting screw hole and fixed to the measuring tube electrode part and concentric with the male screw part. The insulating spacer with the electrode insertion hole penetrating it, and the head of the insulating spacer are placed in close contact with the head of the insulating spacer, and the part that is inserted into the electrode insertion hole and protrudes outward from the outer end of the insulating spacer An electrode having a screw and a nut for screwing the electrode to the insulating spacer by being screwed to the male screw through a washer, a coil spring, a signal wire terminal, etc., which are fitted on the male screw of the electrode. However, the mounting screw hole and the screwed male thread are pressure resistant. It is formed so as to satisfy the required screw pitch, fitting length and number of fitting peaks in the explosive structure, and the contact surface between the electrode inserted into the insulating spacer and the electrode insertion hole of the insulating spacer is pressure resistant. It is characterized in that it is formed so as to satisfy the fitting length and gap size required for the explosion-proof structure. Also, when the inner diameter of the measuring tube is small and it is difficult to form the joint surface, or when the fitting length between the spacer and the joint surface of the measuring tube cannot be sufficient due to insufficient thickness of the measuring tube, the measuring tube electrode A seat protruding outward is provided on the part, and a mounting screw hole is provided so as to penetrate the seat and the wall of the measuring tube concentrically with the electrode shaft.

[0006]

[Action]

 In the electromagnetic flowmeter detector of the present invention, the insulating spacer is fixed by screwing the screw part into the mounting screw hole provided concentrically with the electrode shaft on the measuring tube electrode part, and concentric with the male screw part on the insulating spacer. The pressure-resistant explosion-proof structure was constructed by inserting the electrodes through the electrode insertion holes that were drilled through and tightening them, and forming the respective joint surfaces so that the dimensions required for the pressure-proof explosion-proof structure were satisfied. Since the structure is such that no electrode chamber is formed, the number of parts can be greatly reduced compared to the past. Also, welding work is eliminated, workability during electrode assembly is significantly improved, and cost is reduced. Furthermore, since there are no welded parts, dimensional changes due to thermal strain caused by welding heat do not occur, and reliability in dimensional control is also improved.

[0007]

Embodiments The present invention will be described in detail below based on the embodiments shown in the drawings.

FIG. 1 shows an electromagnetic flowmeter detector according to an embodiment of the present invention. As shown in FIG. 1, in an electromagnetic flowmeter detector having an explosion-proof structure, electrodes provided on the measuring tube 2 so as to be orthogonal to the magnetic flux axis of the exciting coil and the tube axis of the measuring tube 2 not shown. A mounting screw hole 3 is provided concentrically with the electrode shaft in the measurement tube electrode portion including the electrode shaft of No. 4.

The cylindrical insulating spacer 1 made of an insulating material has a male screw portion 1a protruding from the center of one end thereof screwed into the mounting screw hole 3 and fixed to the measuring tube electrode portion. An electrode insertion hole 1b is formed concentrically with the portion 1a so as to penetrate therethrough.

The electrode 4 is inserted into the electrode insertion hole 1 b with the base of the head thereof being in close contact with the lining 6 and the tip of the elbow 1 a of the insulating spacer 1, and the electrode 4 is inserted outward from the outer end of the insulating spacer 1. The protruding portion has a threaded portion, and is fastened to the insulating spacer 1 by a nut screwed to the male threaded portion through a washer, a coil spring, a terminal of the signal line 7 and the like. There is. In FIG. 1, the washer, the coil spring, the signal line terminal, the nut and the like are collectively indicated by reference numeral 5.

Therefore, the mounting screw hole 3 and the screwed male screw portion 1a are formed so as to satisfy the screw pitch, the fitting length, and the number of fitting peaks required for the explosion-proof structure, and are also insulated. The joint surface between the electrode 4 inserted in the spacer 1 and the electrode insertion hole 1b of the insulating spacer 1 is formed so as to satisfy the fitting length and the clearance dimension required for the pressure-proof and explosion-proof structure.

In the electromagnetic flowmeter detector according to the embodiment of the present invention configured as described above, the mounting screw hole 3 and the male screw portion 1a have the explosion-proof structure at the joint surface between the measuring tube electrode portion and the insulating spacer 1. The required screw pitch, fitting length and number of fitting peaks are satisfied, and the fitting length and clearance required for the explosion-proof structure at the joint surface between the electrode 4 and the electrode insertion hole 1b of the insulating spacer 1 are satisfied. Satisfies the dimensions.

As described above, since the structure is such that the electrode chamber is not formed, the number of parts can be greatly reduced compared to the conventional case. Further, since the welding work is eliminated, workability at the time of assembling the electrode portion is greatly improved and the cost is reduced. Further, since there is no welded portion, dimensional change due to thermal strain caused by welding heat does not occur, and reliability in dimensional control is improved.

Next, another embodiment of the present invention will be described with reference to FIG.

In an electromagnetic flowmeter detector equipped with an explosion-proof structure, when the inner diameter of the measuring pipe is small and it is difficult to form the joint surface, or the fitting length of the joint surface between the insulating spacer and the measuring pipe is insufficient due to insufficient thickness of the measuring pipe. In the case where the space is not enough, as shown in FIG. 2, the measuring tube electrode portion is provided with, for example, a columnar seat 8 protruding outward, and the seat 8 and the wall of the measuring tube 4 are penetrated. The mounting screw hole 3 is provided concentrically with the electrode shaft. Insulation spacer 1 having electrode insertion hole 1b The external thread 1a of the insulation spacer 1 is screwed into the mounting screw hole 3 to fix the insulation spacer 1 to the measuring tube electrode part, and the electrode 4 is inserted into the electrode insertion hole 1b of the insulation spacer 1. As shown by reference numeral 5, tightening with a nut is the same as in the case of FIG.

In the electromagnetic flowmeter detector of this embodiment, since the seat 8 is provided, the mounting screw hole 3 and the male screw portion 1a in the joint surface between the insulating spacer 1 and the measuring tube electrode portion are provided in a flameproof structure. It can be formed so as to satisfy the required screw pitch, fitting length and fitting thread number, and the same action and effect as the embodiment of FIG. 1 can be obtained.

[0017]

[Effect of device]

 As described in detail above, according to the present invention, the insulating spacer is fixed by screwing the screw part into the mounting screw hole provided concentrically with the electrode shaft on the measuring tube electrode part, and then fixing the male screw part to the insulating spacer. The electrodes are inserted through the electrode insertion holes that are concentrically drilled through and tightened, and the mating length, clearance, screw pitch, and number of mating threads, etc. required for the flameproof structure at each joint surface. By realizing an electromagnetic flowmeter detector with a flameproof structure by satisfying the requirements above, the number of parts can be greatly reduced compared to the conventional technology in which the electrode chamber is formed. Also, welding work is eliminated, workability at the time of assembling the electrode part is greatly improved, and cost is reduced. Further, since there is no welded portion, dimensional change due to thermal strain caused by welding heat does not occur, and reliability in dimensional control is improved.

[Brief description of drawings]

FIG. 1 is a sectional view showing an electrode portion of an electromagnetic flowmeter detector according to an embodiment of the present invention.

FIG. 2 is a sectional view showing an electrode portion of an electromagnetic flowmeter detector according to another embodiment of the present invention.

FIG. 3 is a sectional view showing an electrode chamber of a conventional electromagnetic flowmeter detector.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Insulating spacer 1a ... Male screw part 1b ... Electrode insertion hole 2 ... Measuring tube 3 ... Mounting screw hole 4 ... Electrode 5 ... Electrode part 6 ... Lining 7 ... Signal line 8 ... Seat

Claims (2)

[Scope of utility model registration request] 1. An electromagnetic flowmeter detector having an explosion-proof structure, wherein a measuring screw electrode part including a magnetic flux axis and an electrode axis orthogonal to the tube axis of the measuring tube is provided with a mounting screw hole concentric with the electrode axis. An insulating spacer having a male screw portion projecting at the center of one end screwed into the mounting screw hole and fixed to the measuring tube electrode portion, and an electrode insertion hole penetrating concentrically with the male screw portion; The electrode that has a threaded portion on the part that protrudes outward from the outer end of the insulating spacer that is inserted into the electrode insertion hole with the head closely attached to the end of the male threaded portion A nut for tightening the electrode to the insulating spacer by screwing it onto the male thread through a washer, a coil spring, a signal wire terminal, etc., and the mounting screw hole and the screwed male thread are explosion-proof. Required screw pitch, fitting length and fitting It is formed so as to satisfy the number of fitting peaks, and the joint surface between the electrode inserted in the insulating spacer and the electrode insertion hole of the insulating spacer satisfies the fitting length and the gap dimension required for the flameproof structure. An electromagnetic flowmeter detector characterized in that it is formed in. 2. The measuring tube electrode portion is projected outward so that the fitting length of the male thread portion of the insulating spacer and the mounting screw hole of the measuring tube electrode portion is the fitting length required for the flameproof structure. The electromagnetic flowmeter detector according to claim 1, wherein a seat is provided and a mounting screw hole is provided so as to penetrate through the seat and the wall of the measuring tube and concentric with the electrode shaft.