JPH0968468A - Insertion type detector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To hold isolation from the outside even in the case of breakage of a protecting tube by locking wiring from a detection element at the side of the protecting tube and integrally burying a terminal block locking the wiring for the outside at the opposed side and the side of an environment to be measured of the terminal box in a terminal plate enclosed by a packing. SOLUTION: A terminal block 12a is integrally buried in a terminal plate 12c, and a pair of boss holes are provided at both the sides thereof. Wiring 1b from a detection element 1a is locked in machine screw holes at the side of a protecting tube and wiring 5 for the outside in the machine screw holes at the opposed side. The locking is performed by sandwiching between the heads of the machine screws 12e engaged in the machine screw holes and the terminal block 12a. The terminal plate 12c is screw-tightened through a packing 12f at a position for blocking the side of an environment to be measured of a terminal box 12. The rear side of the terminal box 12 is a detachable screw cover-like cover and is enclosed through a packing 12h. As such the enclosure of the part of the terminal plate 12c may be complete even if a protecting tube is broken, and the environment to be measured is isolated from the outside.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insertion type detector which is inserted into an environment to be measured such as piping to measure temperature, humidity and the like.

[0002]

2. Description of the Related Art FIG. 5 is an explanatory view showing the structure of a conventional insertion type detector. In the detailed description of the invention, an insertion type detector that measures temperature will be described as an example of the insertion type detector. In the figure, 1 is a protective tube in which a detection element for detecting temperature and wiring are arranged, and 2 is a protective tube 1.
Terminal box for accommodating terminals and the like for connecting the wiring from the wiring to the wiring 5 to the outside, 3 is a mounting screw portion, 4 is a hexagonal nut-shaped nut portion provided in the terminal box 2, and 5 is a measuring instrument body or the like. Is a wiring connected to. Further, 6 is a threaded portion for mounting the insertion type detector provided on the outer wall of the environment to be measured such as piping.

As shown in FIG. 6, the insertion type detector is attached to the outer wall of the environment to be measured by screwing the attachment screw portion 3 into alignment with the screw portion 6.

FIG. 7 is a cross-sectional view showing the structure of a protective tube 1 of a conventional insertion type detector. In the figure, 1a is a detecting element,
1b is wiring from the detection element, and 1c is a sealant. If air or moisture circulates from the terminal box 2 side to the detection element 1a, the measurement in the detection element 1a is likely to be affected by dew condensation or the like. Therefore, in the protective tube 1, as shown in FIG. Sealing measures such as a sealing structure in which a sealant such as silicon rubber is poured around the wiring 1b to be solidified are taken.

FIG. 8 is a sectional view showing the structure around the terminals in the terminal box 2 of the conventional insertion type detector.
Is a metal terminal block 2c for connecting the wiring 1b from the detection element 1a and the wiring 5 connected to the outside such as the measuring device main body with screws 2b or the like so that the wiring 1b and the wiring 5 are electrically connected. The terminal board 2d to which the base is attached is a wiring insertion hole that penetrates the terminal base 2a and the terminal board 2c for passing the wiring 1b from the detection element 1a.

The terminal block 2a is provided for connection by the number of wirings 1b, and the terminal board 2c is usually provided.
The terminal box 2 is attached to the protective tube 1 side and the wiring 5 side to the outside in a form of being divided into two.

[0007]

The conventional insertion type detector is constructed as described above, and the terminal board 2c is formed by dividing the terminal box 2 into two parts, that is, the protective tube 1 side and the wiring 5 side to the outside. However, since the wiring insertion hole 2d penetrates the terminal block 2a and the terminal plate 2c, the airtightness is poor, and air and moisture easily flow into the inside of the protective tube 1 from the outside. There was a problem that it was easily affected.

Further, since the terminal plate 2c has a poor hermeticity, it is highly necessary to complete the sealing structure of the protective tube 1, and the sealing agent is poured from the detecting element 1a to the base of the protective tube 1 to be solidified. As described above, there is a problem in that the manufacturing of the protective tube 1 requires cost and time.

Further, the insertion type detector is often attached to a high place in a building such as an air-conditioning duct, and the operator accidentally drops it on the floor surface when installing it, and a minute portion is attached to a welded portion at the base of the protective tube 1. It may be installed as it is because there is no problem in appearance with many cracks, and if the environment to be measured is high-pressure water etc., it will flow out to the outside of the terminal box 2 through the cracks, the inside of the protective tube 1 and the wiring insertion hole 2d. There were issues such as things to do.

The present invention has been made in order to solve the above-mentioned problems, and the terminal plate portion of the terminal box is completely hermetically sealed to prevent the influence of outside air, moisture, etc., flowing into the protective tube on the measurement. The object is to obtain an insertion type detector that can be prevented. It is another object of the present invention to obtain an insertion type detector with reduced manufacturing cost and manufacturing time by simplifying or eliminating the protective tube sealing structure.

Further, according to the present invention, it is possible to obtain an insertion type detector which can completely seal the terminal plate portion of the terminal box and keep the isolation between the environment to be measured and the outside even if the protective tube is damaged. To aim.

[0012]

According to a first aspect of the present invention, there is provided an insertion type detector in which an electrically conductive terminal block is integrally embedded in a terminal plate, and a detection element is provided on the protective tube side of the embedded terminal block. The locking means for locking the wiring is provided, and the locking means for locking the wiring to the outside is provided on the opposite side, and the terminal board with the terminal block thus arranged is placed in the terminal box under the measured environment. It is attached via a packing at a position where the side is closed.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below.

Embodiment 1 1 is a side view showing the configuration of an insertion type detector according to Embodiment 1 of the present invention, and FIG. 2 is a vertical sectional view of FIG.

In the figure, 11 is a protective tube in which a detecting element 1a for detecting the temperature and wiring (wiring from the detecting element) 1b are arranged, and 12 is wiring 1b from the protective tube 11 and the outside of the measuring instrument body or the like. 2 is a terminal box that houses a terminal plate 12c for connecting to the wiring 5 (outside wiring).

In the protective tube 11, 13 is a mounting screw portion provided around the base of the protective tube 11, and 14 is the protective tube 1.
A hexagonal nut-shaped nut portion provided at the root further than the mounting screw portion 13 at the root portion of the reference numeral 1, 15 is a holding screw screwing portion, and 16 is a packing provided at the bottom of the holding screw screwing portion 15.

In the terminal box 12, the tip of the terminal box 12 is processed into a flare shape to provide a flare processing portion 17a, and the terminal box 12 is provided.
The connecting pipe 18 further protruding is a pressing screw provided on the connecting pipe 17 so as to be rotatable and slidable.

On the outer periphery of the holding screw 18, a screw thread to be screwed into the holding screw screwing portion 15 is threaded, and
In the inner hole of the holding screw 18, the holding screw 18 is connected to the coupling pipe 17
The inner diameter is such that it can rotate and slide freely and can be locked by the flared portion 17a.

FIG. 3 shows a terminal board 12c according to the first embodiment.
12a is a terminal block, 12b is a screw hole (locking means) provided on both sides of the terminal block 12a, and 12d is a mounting hole for the terminal plate 12c.

As shown in FIG. 3, the terminal block 12a is integrally embedded in the terminal plate 12c, and the screw holes 12 are provided on both sides thereof.
b. The screw hole 12b on the protective tube side is the detecting element 1
The wiring 1b from a is locked, and the screw hole 12b on the opposite side is for locking the wiring 5 to the outside. The wiring is attached by sandwiching the wiring between the head of the screw 12e (locking means) screwed into the screw hole 12b and the terminal block 12a.

As shown in FIG. 2, the terminal board 12c is attached by screwing it through a packing 12f at a position in the terminal box 12 where the measured environment side has a closed structure.

The back surface of the terminal box 12 is a detachable cover 12g having a screw lid shape, and is attached in a sealed state via a packing 12h. The work of attaching and detaching the wiring is performed by removing the cover 12g. Reference numeral 12i is a female screw-shaped hole to which a seal connector having a high airtightness or a conduit is connected.
Go outside.

The packing 12h and the packing 1 are the same.
2f, the packing 16 has a large shape as shown in FIG.
The shape is designed so that a set of three small and medium pieces can be molded. With such a design, packing material can be saved and only one type of die or die is required. Manufacturing cost can be suppressed.

The protective tube 11 of the present embodiment has a simple sealing structure in which the periphery of the detection element 1a is only solidified with the sealant 1c, and the detection element 1a can be pulled out from the protection tube 11. It is possible.

Next, the operation will be described.

The procedure for mounting the insertion type detector on the outer wall of the environment to be measured is as follows. (1) In the insertion type detector, each wiring 1b to which the detection element 1a is connected is previously locked with a screw 12e in a corresponding screw hole 12b on the surface of the terminal plate 12c on the side of the protective tube 11, and the terminal plate 12
It is assumed that c is attached to the terminal box 12 via the packing 12f and shipped. Prior to the work of attaching to the outer wall, each wiring 5 to the outside is locked to the corresponding terminal block 12a with screws 12e, and the cover 12g is attached via the packing 12h.

(2) Picking up only the protective tube 11, align the mounting thread portion 13 of the protective tube 11 with the thread portion provided on the outer wall of the environment to be measured, and use the nut portion 14 with a tool such as a spanner. The protection tube 11 is rotated and screwed in. This is protection tube 1
Installation of 1 is completed.

(3) Terminal box 1 to which the detecting element 1a is connected
2 is picked up, and the detecting element 1a and the wiring 1b are protected by the protective tube 11
Insert it to the tip, align the cap screw 18 on the terminal box 12 side with the cap screw threaded portion 15 on the protective tube 11 side, and rotate the cap screw 18 with a tool such as a spanner to screw it in. This completes the installation of the insertion type detector.

The procedure for removing the existing insertion type detector from the outer wall of the environment to be measured for repair, inspection, etc. is as follows. Terminal box 12 side cap screw 18
The terminal box 12 is pulled out from the protective tube 11 together with the detection element 1a by rotating the terminal box 12 in the opposite direction to the installation. Only the protective tube 11 remains on the outer wall of the measured environment in a sealed state of the measured environment. When the protective tube 11 is also pulled out, the protective tube 11 is rotated and removed. This completes the removal of the insertion type detector.

As described above, in the insertion type detector of this embodiment, since the terminal plate 12c is constructed as described above, the detecting element 1 is provided on the side of the protective pipe 11 of the terminal plate 12c.
Since the wiring 1b from a is connected and the wiring 5 to the outside is connected to the opposite side of the terminal board 12c, the conventional terminal board 12c
It is possible to eliminate a penetrating portion such as a wiring insertion hole that has penetrated through. (By the way, the terminal plate 12c has an attachment hole 12d for attaching the terminal plate 12c to the terminal box 12, but this does not serve as a penetrating portion when the terminal plate 12c is attached.) The hermeticity of 12c itself can be perfected.

Further, the terminal plate 12c having the above structure
Is attached to a position in the terminal box 12 where the measured environment side is a closed structure via a packing 12f, so that the terminal environment of the measured environment side can be completely sealed by the terminal plate 12c. In addition, it is possible to prevent the influence on the measurement due to the inflow of outside air, moisture and the like into the protective tube 11. Further, due to the high hermeticity of the terminal board 12c, the sealing structure of the protective tube 11 can be simplified or eliminated as described above, and the manufacturing cost and manufacturing time of the insertion type detector can be reduced. .

Further, since the terminal plate 12c is completely sealed, even if the protective tube 11 is damaged, the terminal plate 1
It is possible to maintain the isolation between the environment to be measured and the outside by, for example, maintaining the airtightness in the portion 2c and not inviting the high-pressure water in the environment to be measured outflowing to the outside.

In addition, in the insertion type detector of this embodiment, the protective tube 11 and the terminal box 12 are detached by attaching and detaching the cap screws 18.
The part is separable, and at the time of mounting on the outer wall of the environment to be measured, first, only the protective tube 11 can be screwed, and then the terminal box 12 can be mounted by the holding screw 18.
Since it is not necessary to rotate the entire insertion type detector, the mounting work can be facilitated.

Further, when removing the existing insertion type detector, it is possible to easily remove only the terminal box 12 portion by rotating the cap screw 18, and as in the case of the present embodiment, the protective tube 11 is removed. When using a tube without a tip opening, the environment to be measured can be kept closed by leaving only the protective tube 11 on the outer wall of the environment to be measured.

Further, when connecting the terminal box 12 to the protective tube 11, as the captive screw 18 is screwed in, the coupling tube 1
Since the flared portion 17a of No. 7 approaches the bottom portion of the pressing screw screwing portion 15 and crushes the packing 16 to make a connection, the hermeticity of the connection portion between the protective tube 11 and the terminal box 12 can be maintained.

In this embodiment, the terminal block 1
Although the screw holes 12b and the screws 12e are used as the means for locking the wiring from both sides of the terminal plate 12c to the terminal 2a, other types of locking means may be used as long as they can lock the wiring on the terminal block 12a. It may be provided.

Further, in the above description of the embodiment,
Although the description has been made by taking the insertion type detector that detects the temperature as an example, it goes without saying that the present invention is also applicable to the insertion type detector that measures other amount such as humidity.

[0038]

As described above, according to the first aspect of the present invention, the conductive terminal block is integrally embedded in the terminal plate, and the wiring from the detecting element is connected to the protective tube side of the embedded terminal block. Since the locking means for stopping is provided and the locking means for locking the wiring to the outside is provided on the opposite side, the wiring from the detection element and the wiring to the outside are respectively connected from both sides of the terminal plate. Therefore, it is possible to eliminate the penetrating portion such as the wiring insertion hole that has conventionally penetrated through the terminal board and complete the hermeticity of the terminal board itself.

Since the terminal board on which the terminal block is thus arranged is attached through the packing at a position in the terminal box where the measured environment side has a closed structure,
It is possible to completely seal the space under the environment to be measured by the terminal plate, and it is possible to prevent the influence on the measurement due to the inflow of outside air, moisture and the like into the protective tube.

Further, since the terminal plate has a high hermeticity, there is an effect that the protective tube sealing structure can be simplified or unnecessary and the manufacturing cost and manufacturing time of the insertion type detector can be reduced.

Further, even if the protective tube is damaged, there is an effect that the terminal board portion can be kept sealed and the environment to be measured can be kept isolated from the outside.

[Brief description of drawings]

FIG. 1 is a side view showing a configuration of an insertion type detector according to a first embodiment of the present invention.

FIG. 2 is a vertical sectional view showing the structure of the insertion type detector according to the first embodiment of the present invention.

FIG. 3 is a cross-sectional view showing the structure of the terminal plate according to the first embodiment.

FIG. 4 is an explanatory view showing the molding of the packing according to the first embodiment.

FIG. 5 is an explanatory diagram showing a structure of a conventional insertion type detector.

FIG. 6 is an explanatory view showing the attachment of a conventional insertion type detector.

FIG. 7 is a cross-sectional view showing a structure of a protection tube of a conventional insertion type detector.

FIG. 8 is a cross-sectional view showing a structure around a terminal in a terminal box of a conventional insertion type detector.

[Explanation of symbols]

 1a Detection element 1b Wiring (wiring from detection element) 5 Wiring (wiring to the outside) 11 Protective tube 12 Terminal box 12a Terminal block 12b Screw hole (locking means) 12c Terminal plate 12e Screw (locking means) 12f Packing

Claims (1)

[Claims] 1. A protective tube for accommodating a detection element and a wiring from the detection element, which is inserted into an environment to be measured, and a protection tube connected to the protection tube and connected to the protection tube and an external wiring. In an insertion type detector provided with a terminal box accommodating a terminal plate in which a conductive terminal block for connection is arranged, the terminal block is
The protective tube side is provided with a locking means for locking the wiring from the detection element, and the opposite side is provided with a locking means for locking the wiring to the outside, and the terminal is integrally embedded in the terminal plate, and the terminal is provided. The plate is attached through a packing at a position in the terminal box where the environment to be measured has a closed structure, and the plate is attached.