JPH0618140Y2 - Bucket steam trap actuation detector - Google Patents

Description

[Detailed Description of the Invention] Industrial field of application The present invention is installed in a steam line or a steam-using device, and the operating state of a bucket-type steam trap that automatically discharges only condensed water without leaking steam The present invention relates to a detector for detecting whether water is being discharged normally, leaking steam, and the like.

The bucket type steam trap uses the floating and descending of the bucket due to the difference in specific gravity between condensate and steam to intermittently repeat the on-off valve operation. That is, the bucket floats and closes the valve when the inside of the bucket is filled with a predetermined amount of steam, and drops and opens when the inside steam decreases due to condensation or the like. If steam comes in during the descent, the bucket will float again and close the valve, but normally there is some condensate on the primary side of the trap during the floating closing period, so the descent Then the valve is opened and the condensate is discharged. The discharge of the condensate is normally performed for several seconds to several tens of seconds, and when the discharge of the condensate is completed, the bucket flows up again by the steam flowing into the bucket and the valve is closed.

The bucket-type steam trap operates the opening / closing valve intermittently as described above, but if the trap discharge capacity is smaller than the amount of condensed water generated on the primary side of the trap, the condensate is continuously However, the condensate stays in the primary pipe of the trap, water hammer is generated, and the effectiveness of the steam generator is reduced. If the amount of condensate generated on the primary side of the trap and the discharge capacity of the trap are exactly the same, the condensate will basically stay in the primary pipe of the trap by continuously discharging the condensate. There is no. However, since the amount of condensate generated changes depending on the environment such as the ambient temperature and the load on the steam using device, there is a risk that the capacity will be insufficient. Further, if the valve closing function deteriorates and steam is leaked, expensive energy is wasted.

2. Description of the Related Art Therefore, conventionally, the operating state of the steam trap has been confirmed, and various detectors therefor have been developed and put to practical use.

One of them is to measure the vibration caused by the operation of the steam trap with an ultrasonic sensor and convert it to electric vibration, amplify the electric signal and shake the needle of the meter or sound the speaker. is there. This is based on the fact that the intensity of vibration with respect to frequency is different when the trap discharges only condensate and when it leaks steam. That is, when only the condensate is discharged, the vibration intensity is low, and when the steam is leaking, it is high. Therefore, it is possible to detect whether or not steam is leaking.

Problems to be Solved by the Invention In this case, although it is possible to detect the presence or absence of steam leakage, there is a problem that the capacity shortage of the bucket steam trap that cannot discharge the generated condensate cannot be detected. That is, when the capacity is insufficient, the vibration intensity is almost equal to that in the case where only the condensate is normally discharged quickly, and therefore it is not possible to distinguish between them.

Therefore, the technical problem of the present invention is to be able to detect the presence or absence of vapor leakage and insufficient capacity of a bucket type steam trap.

Means for Solving the Problems Technical means of the present invention taken to solve the above technical problems are a detector for actually measuring the intensity of vibration associated with the operation of an opening / closing valve of a bucket type steam trap, and the actually measured In a bucket type steam trap operation detector consisting of a calculator that detects the presence or absence of steam leakage based on the strength of vibration,
By comparing the intensity of vibration measured when the condensate was discharged normally, which was previously measured by the computing unit, with the measured intensity of vibration, the intensity of vibration of both was substantially equal for a predetermined time. Sometimes, it is determined that the capacity is insufficient.

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

When steam is leaked, the vibration intensity is higher than when normal condensate is normally discharged, so this occurs when normal condensate is measured beforehand. It is possible to detect whether or not the steam is leaked by comparing the vibration intensity with the actually measured vibration intensity.

If the capacity is less than the amount of condensate generated,
Since the condensate is discharged continuously, the vibration intensity that is the same as the vibration intensity generated when only the condensate is discharged normally measured in advance is continuously detected. .
Therefore, it is possible to determine that the capacity is insufficient when the actually measured vibration intensity and the vibration intensity generated in advance when only the condensed water is normally discharged are substantially equal to each other for a predetermined time, for example, one minute. In addition, when the discharge capacity matches the condensate generation amount, as with the above capacity shortage, the vibration intensity that is almost the same as the vibration intensity generated when only the condensate is normally discharged is measured in advance. The intensity will be detected continuously. In this case, strictly speaking, the capacity is not insufficient, but when the amount of generated condensate is large, the capacity is insufficient. By determining that the capacity is insufficient when the intensities of the vibrations generated at 1 are substantially equal to each other for a predetermined time, for example, 1 minute, it is possible to avoid the risk of a water hammer or a reduction in the efficiency of the steam generator.

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

The conventional steam trap operation detector only detects the presence or absence of vapor leakage, but the present invention can detect insufficient capacity. Therefore, by replacing with a trap having a large discharge capacity, it is possible to prevent the efficiency of the water hammer and the equipment using steam from being lowered.

EXAMPLE An example showing a specific example of the present invention will be described (see FIG. 1).

The operation detector is composed of the detector 1, the operation display unit 50, and a cable 51 connecting them. Detector 1 is detection needle 2
A detection needle holding member 4, a front cover 6 connecting the detection needle holding member 4 and the main body 5, and a cable outlet 25.
And a rear cap 7 having

In a substantially cylindrical internal space formed by the front cover 6 and the main body 5, a holding plate 15 for holding the diaphragm mounting member 11, a holding plate 15 and an ultrasonic microphone 16 are provided.
A spring holder 19 that is connected to a microphone holder 18 that is held via a ring 17 and a printed circuit board 20 that has a circuit that amplifies a detection signal are arranged.

The upper half of the detection needle holding member 4 is conical and the lower half is cylindrical. A vertical hole 9 penetrating therethrough is formed in the central portion, and the detection needle 2 is arranged inside. The detection needle 2 slides in the detection needle holding member 4 until the tip of the detection needle holding member 4 contacts the surface of the object to be detected. The detection needle 2 has a substantially cylindrical shape, the temperature sensor 10 is arranged at one end, and the vibration plate mounting member 1 is arranged at the other end.
It is formed by press-fitting into 1. The conducting wire from the temperature sensor 10 is provided with a conducting wire hole 12 provided halfway in the center of the detecting needle 2, a vertical hole 9 of the detecting needle holding member 4, a communicating hole 14 for communicating the holding plate 15, the spring holder 19, and the microphone holder 18.
And the wiring inside the printed circuit board 20.

The diaphragm 21 is screwed onto one end of the diaphragm mounting member 11.
The ultrasonic microphone 16 is arranged so as to face the diaphragm 21. The pins of the ultrasonic microphone 16 are connected into the printed circuit board 20. The spring holder 19 has a cylindrical space inside, and has a coil spring 22 for maintaining a constant pressing force of the detection needle 2 against the object to be detected.

A micro switch is attached to the holding plate 15. The lead wire from the micro switch 31 is connected to the inside of the printed board 20. The micro switch 31 is switched on when the distance from the diaphragm mounting member 11 is equal to or more than a certain value, and is turned off when the distance is less than a certain value. This distance is the position where the tip of the detection needle 2 is pushed to the tip of the detection needle holding member 4. Holding plate 15
, The spring holder 19 and the microphone holder 18 are connected by a screw 23.

The arithmetic unit 50 is composed of a functional unit for arithmetically processing each signal sent from the printed circuit board 20 in the detector 1, a display unit and the like.

The operation detector described above operates as follows. When the temperature sensor 10 at the tip of the detector 1 is pressed against the object to be detected, the detection needle 2 is pushed to the tip of the detection needle holding member 4 against the biasing force of the coil spring 22, and the micro switch 31 is pushed at this position. Then, the calculation display device 50 is in the measurement start state.

The temperature signal from the temperature sensor 10 is directly transmitted to the arithmetic display 50 through the lead wire, and at the same time, the mechanical vibration is transmitted to the diaphragm mounting member 11 through the detection needle 2 to vibrate the diaphragm 21. The vibration of the diaphragm 21 propagates through the space inside the micro holder 18 and is transmitted to the facing ultrasonic microphone 16, and is sent as a vibration signal to the arithmetic display unit 50 through the printed circuit board 20.

The calculation display device 50 compares the signal from the temperature sensor 10 with the reference temperature stored in advance, and when the detected temperature is lower than the reference temperature, the calculation display device 50 determines whether the condensate discharge function is lost. If the detected temperature is higher than the reference temperature, compare the measured vibration strength with the measured vibration strength that occurs when only condensate is being discharged, which was measured in advance, and compare the measured vibration strength. If the strength is greater, it is judged to be a vapor leak. If the measured vibration strength is not great,
When it is determined that the capacity is insufficient and the opening / closing valve operation is repeated when the strength of vibration that is measured in advance and only when the condensate is discharged normally and the measured vibration strength are approximately equal for a predetermined time Is judged to be normal.

[Brief description of drawings]

 FIG. 1 is a block diagram of the present invention and a sectional view of a detector. 1: Detector 2: Detection needle 10: Temperature sensor 16: Ultrasonic microphone 20: Printed circuit board 21: Vibration plate 50: Calculation display

Claims (1)

[Scope of utility model registration request] 1. A bucket type steam comprising a detector for actually measuring the intensity of vibration associated with the operation of an opening / closing valve of a bucket type steam trap, and a calculator for detecting the presence or absence of steam leakage based on the actually measured intensity of vibration. In the operation detector of the trap, compare the intensity of vibration measured when the condensate was being discharged normally measured in advance by the calculator with the measured intensity of vibration, and compare A bucket-type steam trap operation detector that determines if the capacity is insufficient when the vibration intensity is approximately the same for a predetermined time.