JPH0712905Y2 - Vibration sensor with temperature sensor - Google Patents

Description

[Detailed Description of the Invention] Industrial field of application The present invention relates to a vibration sensor used for detecting the vibration associated with the operation of a valve such as a steam trap or the vibration of a rotating shaft to confirm the quality of the operation. The present invention relates to an improvement of a sensor equipped with a temperature sensor.

If you attach a temperature sensor to the vibration sensor, for example, when you want to check the abnormality of the rotating shaft, detect the temperature rise,
Coolant can be injected. In addition, when judging the operation of the steam trap, it is possible to detect the temperature drop and confirm that the trap is in the valve open state (so-called “funzumari”), or the temperature control trap can be set to the set temperature from the detected temperature. It is possible to check whether or not the valve is opened and closed, and to convert the detected temperature into a saturated pressure and calculate the vapor leakage amount from the relationship between the vibration level and the leakage amount according to the pressure.

2. Description of the Related Art As a vibration sensor equipped with a temperature sensor, for example, there is one disclosed in Japanese Utility Model Laid-Open No. 63-124628.
This is because the tip of the detection needle is projected from the casing by a spring arranged between the spring holder, a recess is formed at the tip of the detection needle, the temperature sensor is arranged in the recess, and the temperature sensor is arranged between the detection needle and the temperature sensor. The tip of the temperature sensor is projected from the tip of the detection needle with a spring. Vibration and temperature are detected at the position where the temperature sensor and detection needle are pushed all the way to the tip of the casing.

Problems to be Solved by the Invention The reason why the detection needle and the temperature sensor are biased by the springs respectively are to press the detection needle and the temperature sensor against the object to be detected with desired pressing forces. However, in the above,
Since the spring that biases the temperature sensor is placed between the detection needle and the detection needle, it is necessary to select the spring force that biases the temperature sensor in advance as the spring force that biases the detection needle. Useless. Further, since the spring for biasing the temperature sensor and the detection needle come into contact with each other, there is a problem in that the detection vibration varies and the accuracy deteriorates.

Means for Solving the Problems The technical means of the present invention taken to solve the above technical problems include a casing, a detection needle slidably arranged in the casing and having a middle-diameter portion. , A spring holder arranged in the casing on the rear end side of the large diameter portion of the detection needle, a spring arranged between the large diameter portion of the detection needle and the spring holder to protrude the tip of the detection needle from the casing, A stopper arranged inside the casing on the tip side of the large-diameter portion of the needle to restrict the detection needle from protruding from the casing and a microphone arranged on the rear-end side of the detecting needle. A vibration sensor, a heat insulation pipe arranged around the outer circumference of the detection needle, a temperature sensor arranged on the top surface of the heat insulation pipe with an upper surface centering on the hole into which the tip of the detection needle enters, a stopper and a heat insulation pipe. Insulated arranged between And a spring for allowing the upper surface of the temperature sensor to protrude from the casing via a pipe.

Action The action of the above technical means is as follows.

A spring that urges the detection needle is placed between the large diameter part and the spring holder, and a spring that urges the temperature sensor is placed between the stopper that restricts the protrusion of the detection needle from the casing and the heat insulating tube. Therefore, the spring for urging the detection needle and the spring for urging the temperature sensor can be independently selected to have desired forces. Further, since the spring for urging the temperature sensor does not come into contact with the detection needle, the detection vibration does not vary.

Effect of the Invention The present invention has the following unique effects.

According to the present invention, a spring having a smaller spring constant or a smaller displacement than the conventional one can be selected as a spring for urging the detection needle. You can Further, since the detected vibration does not vary, a highly accurate vibration sensor with a temperature sensor can be obtained.

EXAMPLE An example showing a concrete example of the present invention will be described (FIGS. 1 and 2).
See figure).

The casing of the vibration sensor comprises a main body 1, a front cap 2 and a rear cap 3. The micro switch substrate 4, the stopper 5, the detection needle holder 6, the microphone holder 7, and the substrate holder 8 are arranged in the casing. The micro switch board 4, the stopper 5, the detection needle holder 6 and the microphone holder 7 are connected by screws 9.

A detection needle 11 having a slide ring 10 arranged on the outer periphery is slidably held by a detection needle holder 6. The detection needle 11 has a large-diameter portion in the middle, and is biased by a spring 13 arranged between the large-diameter portion and a spring holder 12 located on the rear end side of the large-diameter portion, and the tip end of the front cap 2 is It projects more than the tip. The protrusion of the detection needle 11 from the front cap 2 is restricted by the large-diameter portion coming into contact with the stopper 5. By pushing the tip of the detection needle 11 to the tip of the front cap 2, the micro switch 14 attached to the micro switch board 4 is turned on. The micro switch 14 is turned on when the distance from the detection needle 11 is more than a certain value and is turned off when the distance is less than a certain value.

A diaphragm 15 is attached to the rear end of the detection needle 11 with a set screw 16. An ultrasonic microphone 18 is attached to the microphone holder 7 via a rubber cover 17. A sensor substrate 19 having a circuit for amplifying a detection signal is attached to the substrate holder 8.

A heat insulating pipe 20 is arranged on the outer periphery of the tip of the detection needle 11. Adiabatic tube
Place the spring 21 between the 20 and the stopper 5. A cross-shaped notch is provided at the upper end of the heat insulating pipe 20. Heat insulation pipe 20
A thermocouple 22 as a temperature sensor is arranged outside the. The thermocouple 22 is formed by bending an elongated thin plate, and an upper surface portion that rests on the upper surface of the protrusion between the cutouts of the heat insulating pipe 20, and a side surface portion that extends downward from both sides of this upper surface portion and is located on the side surface of the heat insulating pipe 20. It consists of and. A hole is made in the center of the upper surface portion, and the tip of the detection needle 11 projects from there. The lower portion of the side surface portion is provided with a slack by rotating it once, and the lower end thereof is connected to the microswitch substrate 4. A shrink tube between the outer circumference of the thermocouple 22 and the front cap 2.
Place 23,24. The thermocouple 22 is made to protrude from the tip of the front cap 2 via the heat insulating pipe 20 by the spring 21. Reference numbers 25 and 26 are O-rings, and 27 and 28 are synthetic rubbers. Illustrations of electrical wiring and parts of the board are omitted.

When the detection needle 11 is pressed against the object to be detected, the spring 13 is compressed and pushed into the tip of the thermocouple 22.
Next, the detection needle 11 and the thermocouple 22 compress the spring 13 and the spring 21, respectively, and the micro switch 14 is turned on at a position where the spring 13 and the spring 21 are pushed to the tip of the front cap 2 to start the detection.

[Brief description of drawings]

1 is a sectional view of an embodiment of the present invention, and FIG. 2 is an enlarged sectional view of the upper end portion of FIG. 1: Main body, 5: Stopper 11: Detection needle, 12: Spring holder 13: Spring, 15: Vibration plate 19: Ultrasonic microphone 20: Adiabatic tube, 21: Spring 22: Thermocouple

Claims (1)

[Scope of utility model registration request] 1. A casing, a detection needle slidably arranged in the casing and having a large diameter portion in the middle, and a spring holder arranged in the casing on the rear end side of the large diameter portion of the detection needle. , A spring that is arranged between the large diameter part of the detection needle and the spring holder to project the tip of the detection needle from the casing, and a large diameter part of the detection needle that is arranged in the casing on the tip side of the large diameter part of the detection needle. A vibration sensor consisting of a stopper that abuts and restricts the detection needle from projecting from the casing, a microphone that is arranged on the rear end side of the detection needle, a heat insulating tube that is arranged on the outer circumference of the detection needle, and the tip of the detection needle. A temperature sensor having an upper surface having a hole for accommodating it placed on the upper surface of the heat insulating pipe, and a spring arranged between the stopper and the heat insulating pipe for protruding the upper surface of the temperature sensor from the casing through the heat insulating pipe. Temperature sensor with vibration sensor, characterized by comprising.