JPH0625708U - Sensor mounting jig - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a sensor mounting jig with high sealing performance. [Structure] The bush 1 and the probe case 3 are sealed by a driven O-ring 10 and a fixed O-ring 11 so that the driven O-ring 10 moves as the probe case 3 moves and the fixed O-ring 11 does not move. Constitute. The fixed O-ring 11 can be replaced by removing the collar 2.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention relates to a sensor mounting jig.

[0002]

[Prior art]

 Techniques have been developed for early detection of leaks and failures by monitoring the state of stirrers and pumps using displacement sensors. When installing a sensor inside a closed container such as an agitator or pump, make a hole in the container, attach an appropriate jig to the hole, and attach the sensor through the jig. The configuration is adopted. A space between the hole of the closed container and the jig, a space between the jig and the sensor, and the like are sealed by an O-ring or a sleeve.

[0003]

[Problems to be solved by the device]

 However, in the case of the conventional jig configuration, if the seal such as the O-ring or the sleeve is damaged or corroded by the sealed object in the closed container, there is a problem that the seal cannot be easily replaced. . In the case of a non-contact displacement sensor, etc., it is necessary to adjust the distance to the measurement object on the order of μm, and it is necessary to move the sensor while maintaining the sealing performance. Therefore, there is a risk that the seal may be damaged. Further, there is a problem that the sealed body such as liquid may flow out of the container due to damage of the sensor casing itself. The present invention aims to solve the above-mentioned problems of the prior art.

[0004]

[Means for Solving the Problems]

 In order to achieve the above object, the sensor jig of the present invention comprises a bush mounted in a hole provided in a closed container wall, a probe case penetrating the bush so as to be axially movable and protruding into the closed container. , A first seal that seals between the bush and the probe case and moves with the movement of the probe case, and a seal between the bush and the probe case that does not move with the movement of the probe case It is characterized by having two seals.

[0005]

[Action]

 A first seal that seals between the bush and the probe case and that moves as the probe case moves, and a second seal that seals between the bush and the probe case that does not move as the probe case moves. Thus, the high sealability is maintained, and even if the first seal that moves due to the movement of the probe is damaged, the second seal that does not move maintains the sealability.

[0006]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, a hole is formed in the closed container X, and the bush 1 is inserted therein. The bush 1 is screwed into the closed container X with a screw 15, and the gap between the bush 1 and the closed container X is sealed by a packing 5 at a step portion of a hole.

A probe case 3 is inserted into the bush 1 from outside the closed container X to inside the closed container X. That is, a screw 6 is formed at the end of the bush 1 on the inner side of the closed container X, and the probe case 3 is screwed into the screw 6. The probe case 3 is constructed so that the probe case 3 is moved in the vertical direction in the drawing and the position is adjusted by the screwing amount of the probe case 3.

A circumferential groove is formed on the outer periphery of the intermediate portion of the probe case 3, and a driven O-ring 10 is fitted therein to seal the interior of the bush 1. Since the driven O-ring 10 is mounted on the probe case 3 side, the driven O-ring 10 moves along with the movement of the probe case 3 in the axial direction. On the other hand, a groove with an open upper end is similarly formed on the inner circumference of the end portion of the bush 1 on the outer side of the container, and the fixed O-ring 11 is fitted and inserted therein, so that the outer circumference of the probe case 3 is sealed. Is configured. Since the fixed O-ring 11 is mounted on the bush 1 side, the fixed O-ring 11 is fixed without moving in the axial direction and is not moved by the movement of the probe case 3. The fixed O-ring 11 can be removed and attached from the upper end side of the bush 1.

A collar 2 is further attached to the upper end of the bush 1. The collar 2 is fitted and inserted into the outer circumference of the probe case 3 with a screw 20, abuts against the fixed O-ring 11, and the end surface of the collar 2 is also sealed by the fixed O-ring 11. Also, the bush 1 and the collar 2 serve as a double nut. The fixed O-ring 11 can be easily attached to and detached from the bush 1 by removing the collar 2.

A moving gap 31 is provided between the probe case 3 and the collar 2 and between the probe case 3 and the bush 1 to form a movement allowance in the axial direction of the probe case 3, It is possible to adjust the movement of.

A ceramic case 4 is attached to the tip of the probe case 3 protruding into the closed container X, and a predetermined sensor (not shown) is housed inside the ceramic case 4. The sensor cable Y of the sensor is configured to be led out of the closed container X from the open rear end of the probe case 3. A resin case or the like may be used instead of the ceramic case 4. Also, as shown in FIG. 2, the rear end of the probe case 3 has a taper shape, and a taper screw 30 for a cap is formed on the rear end of the probe case 3 so that the seal tape can be wrapped around or the packing can be inserted to attach the cap 7. Has become. As a result, even if the probe case 3 or the ceramic case 4 is damaged or cracked, it is possible to effectively prevent the fluid inside the closed container X from flowing out of the closed container X through the inside of the probe case 3.

In the above configuration, the packing 5 seals between the bush 1 and the closed container X. The packing 5 is tightened and fixed by the screw 15 of the bush 1. The probe case 3 and the bush 1 are sealed by a driven O-ring 10 and a fixed O-ring 11. The driven O-ring 10 seals while moving as the probe case 3 moves. Even if twisting or breakage occurs due to the movement, leakage is not caused because the fixed O-ring 11 seals. Moreover, the fixed O-ring 11 is also fastened by the collar 2 and can be replaced by removing the collar 2. During the replacement, the driven O-ring 10 seals the replacement O-ring 11 without any leakage. Furthermore, the effect of the double nut of the collar 2 and the bush 1 ensures the entire fastening. While maintaining such excellent sealability, the position of the ceramic case 4 can be adjusted accurately by adjusting the screwing amount of the probe case 3, so it is suitable for sensors that require alignment with the measurement target. Can be dealt with effectively. Further, when the probe case 3 or the ceramic case 4 is damaged or cracked, the sensor cable Y is removed and the cap 7 is screwed into the cap screw 30 to prevent outflow of fluid or the like inside the closed container X. It will be possible.

[0013]

[Effect of device]

 As described above, the sensor jig of the present invention comprises a bush mounted in a hole provided in a closed container wall, a probe case penetrating the bush so as to be axially movable and protruding into the closed container, A first seal that seals between the bush and the probe case and moves with the movement of the probe case; and a second seal that seals between the bush and the probe case and does not move with the movement of the probe case. With this, the probe case can be moved while maintaining high sealing performance, and the sensor can be effectively adjusted with high accuracy.

[Brief description of drawings]

FIG. 1 is a front sectional view showing an embodiment of the present invention.

FIG. 2 is a partially enlarged sectional view showing an embodiment of the present invention.

[Explanation of symbols]

1: Bush, 2: Color, 3: Probe case, 4:
Ceramic case, 5: packing, 6: screw, 7: cap, 10: driven O-ring, 11: fixed O-ring, 1
5: screw, 20: screw, 30: taper screw for cap, 31: moving gap.

Claims (4)

[Scope of utility model registration request] 1. A bush mounted in a hole formed in a wall of a closed container, a probe case penetrating the bush so as to be movable in an axial direction and protruding into the closed container, and a seal between the bush and the probe case. And a second seal that moves with the movement of the probe case and a second seal that seals between the bush and the probe case and does not move with the movement of the probe case. Sensor mounting jig. 2. A bush mounted in a hole provided in the wall of the closed container, a probe case penetrating the bush so as to be movable in the axial direction and protruding into the closed container, and an axis line between the bush and the probe case. A first seal that seals at an intermediate portion in the direction, a second seal that seals between the bush and the probe case at a rear end of the bush in the outer direction of the sealed container, and a detachable fit from the outside of the probe case. A sensor mounting jig, comprising: a collar that is inserted and contacts the rear end portion of the bush to removably fasten the second seal. 3. A bush mounted in a hole provided in the wall of the closed container, a probe case penetrating the bush so as to be movable in the axial direction and protruding into the closed container, and an axis line between the bush and the probe case. The driven seal that seals at the middle part in the direction and moves with the movement of the probe case, and the gap between the bush and the probe case at the rear end of the bush in the outer direction of the sealed container, and with the movement of the probe case. A stationary seal that does not move; and a collar that is detachably fitted from the outside of the probe case and that contacts the rear end portion of the bush to removably fasten the second seal. Sensor mounting jig. 4. The sensor mounting jig according to claim 1, further comprising a cap that closes an open end of the probe case outside the hermetically sealed container.