JP3993702B2 - Steam trap operation diagnostic device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a steam trap operation diagnosis device for diagnosing whether or not an intermittent steam trap is operating normally.
[0002]
[Prior art]
Conventionally, in order to diagnose whether an intermittent steam trap is operating normally, it is confirmed that the condensate is intermittently discharged on the secondary side of the steam trap, or a vibration meter is attached to the steam trap. To detect the operation of the steam trap as vibration.
[0003]
[Problems to be solved by the invention]
However, in steam piping systems installed in factories and the like, it is not easy for the general person who does not understand the operating principle of the steam trap to confirm the appropriateness of the operation of the steam trap, and it is not easy to confirm by the above-mentioned visual maintenance. Confirmation by the person is required.
In addition, when a vibration meter is installed in the steam trap, it may be difficult to install the vibration meter or to read the vibration meter depending on the state of the steam piping. Further, since the steam trap operates intermittently, the diagnosis work must be waited until the steam trap operates, which takes time.
[0004]
The present invention has been made in view of the above problems, and it is possible for a general person who does not understand the operation principle of the steam trap to easily check whether the steam trap is operating normally. An object of the present invention is to provide an operation diagnostic apparatus.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the steam trap operation diagnostic device according to claim 1 detects the temperature of the condensate discharge passage on the secondary side of the intermittent steam trap connected to the steam pipe and automatically opening and closing intermittently. A temperature display is attached, and a heat radiating flange is interposed between the temperature sensor and the intermittent steam trap in the condensate discharge passage, and the temperature sensor displays a different color for each temperature region. It has. According to this configuration, when the steam trap is in the closed / paused state, the temperature of the condensate discharge passage decreases, and the color display means of the temperature sensor that detects this temperature displays the color of the temperature region corresponding to the closed / paused state. To do. In addition, when the steam trap is in a normal operating state, the temperature of the condensate discharge passage rises more than in the closed / resting state, and the color display means of the temperature sensor that detects this temperature is a color in the temperature region corresponding to normal operation. Is displayed. In addition, when the steam trap is in the blowout / steam leak state, the temperature of the condensate discharge passage rises from that during normal operation, and the color display means of the temperature sensor that detects this temperature is the color in the temperature region corresponding to the blowout / steam leak. Is displayed. Therefore, even a general person who does not understand the operating principle of the steam trap can easily diagnose the operating state of the steam trap by visually observing the difference in color displayed by the color display means. Also, due to the heat dissipation action of the flange, the condensate discharge passage detected by the temperature sensor when the steam trap is closed / rested, when it is in normal operation, and when it is blown or steam leaked As a result, there is a clear difference in the temperature of the steam trap, and the state of the steam trap can be reliably detected.

[0006]
According to a second aspect of the present invention, there is provided the steam trap operation diagnosis apparatus according to the first aspect, wherein the temperature sensor detects a temperature and rotates an output shaft, and a plurality of different colors are displayed side by side in the circumferential direction. A color display panel fixed to the output shaft and a display window for exposing a portion of the color display panel with respect to the detected temperature are provided.
According to this configuration, when the steam trap is in a closed / resting state, a normal operating state, or a blowout / steam leaking state, the color display panel rotates by a rotation angle corresponding to these states, and color display is performed. Since the part corresponding to each state of the panel is displayed on the display window, the operating state of the steam trap can be easily diagnosed by observing the color of the color display panel exposed to the display window.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 5 is a schematic piping diagram showing a part of a steam piping system including a steam trap operation diagnosis device according to an embodiment of the present invention. A steam trap 2 is connected to each end portion of the plurality of steam pipes 1, and a condensate discharge passage 3 that is a secondary side passage of these steam traps 2 is connected to a common drain pipe 4. The condensate collected through the process is condensed by the cooler 5 and discharged into the drainage groove 6. Further, on the secondary side of each steam trap 2, an operation diagnosis device 7 for diagnosing suitability of the operation state of the steam trap 2 is attached.
[0008]
FIG. 1A shows a specific structure of a portion where the operation diagnostic device 7 is connected to the secondary side of the steam trap 2, and FIG. 2 shows a schematic longitudinal sectional view thereof. As shown in FIG. 2, the steam trap 2 is a disc-type intermittent type, is connected to the primary passage 1 a in the steam pipe 1, has a variable pressure chamber 9 covered with a cap 8, The pressure difference, that is, the pressure difference between the primary side and the variable pressure chamber 9 automatically opens and closes intermittently. The variable pressure chamber 9 communicates with an input port 10 on the primary side and an output port 11 on the secondary side. A disk 12 for opening and closing both ports 10 and 11 is provided in the variable pressure chamber 9 so as to be freely movable.
[0009]
The operation diagnosis device 7 is configured by attaching a temperature sensor 14 to a communication pipe portion 13 extending from the secondary side of the steam trap 2. The temperature sensor 14 is a thermometer that detects the temperature of the condensate discharge passage 3, for example, a sensor unit 15 including a bimetal thermometer that incorporates a bimetal (not shown) that expands and contracts according to the detected temperature, An output shaft 16 that rotates as the bimetal expands and contracts, a color display board 17 fixed to the output shaft 16, and a display window 18 that exposes a part of the color display board 17 to the outside.
[0010]
The sensor unit 15 is disposed inside the communication pipe unit 13, and the output shaft 16 protrudes to the outside of the communication pipe unit 13. The output shaft 16 and the color display board 17 are accommodated in a disc-shaped housing 19, and the display window 18 is opened on the surface of the housing 19 as shown in FIG. The sensor unit 15 may be a hydraulic thermometer containing wax in addition to the bimetal thermometer.
[0011]
FIG. 3 is a perspective view of the temperature sensor 14 in which the upper lid portion 19b connected to the main body portion 19a of the housing 19 with a screw 21 is separated. On the surface of the color display board 17, color regions 20B, 20G, and 20R colored in three kinds of colors B, G, and R are divided at equal intervals in the circumferential direction as shown in a plan view in FIG. Is displayed. These color regions 20B, 20G, and 20R correspond to the temperature regions detected by the sensor unit 15, and are colored, for example, blue, green, and red.
[0012]
That is, when the steam trap 2 is in a closed / paused state, blue B corresponds to the temperature region of the condensate discharge passage 3 detected by the sensor unit 15, and the steam trap 2 is in a normal operating state. At this time, green G corresponds to the temperature range of the condensate discharge passage 3 detected by the sensor unit 15, and further, the recovery detected by the sensor unit 15 when the steam trap 2 is in a blown / steam leaking state. The red R corresponds to the temperature region of the water discharge passage 3. If the color display board 17 is rotated clockwise as indicated by an arrow A in FIG. 4 as the detected temperature rises, blue B, green G, The red color R is arranged counterclockwise in the order of these (low temperature to high temperature). Further, when the steam trap 2 is in each of the above-described states, the display window 18 is installed at a position where colors corresponding to these states are exposed. Specifically, the position of the display window 18 is set so that the display window 18 exposes the blue region 20B of the color display board 17 when the detected temperature is about room temperature.
[0013]
Moreover, in this embodiment, as shown in FIG. 1 (A), a heat radiating flange 21 is interposed in the middle of the communication pipe portion 13 to which the temperature sensor 14 is attached. Due to the heat radiation action of the flange 21, the condensate detected by the temperature sensor 14 when the steam trap 2 is in a closed / resting state, in a normal operating state, and in a state of being blown out / steam leaked. A clear difference is made in the temperature of the discharge passage 3.
[0014]
Next, the operation of the above configuration will be described.
Steam or condensate is always present in the steam passage 1a which is the primary side of the steam trap 2 shown in FIG. When the steam trap 2 is in the closed / resting state, neither steam nor condensate flows into the condensate discharge passage 3 on the secondary side of the steam trap 2, so the temperature of the condensate discharge passage 3 is normal temperature or a steam trap It becomes below the saturation temperature of the secondary side steam pressure. The rotation amount of the output shaft 16 of the temperature sensor 14 for detecting this temperature is slight, and at this time, the blue region 20B of the color display board 17 is exposed to the display window 18 as shown in FIG.
[0015]
Further, when the steam trap 2 is in a normal operating state, as shown in FIG. 6, the low-temperature condensate or air that has accumulated in the steam pipe 1 on the primary side at the beginning of ventilation flows into the steam trap 2, The disk 12 is pushed up through the inlet port 10 and discharged to the outlet port 11. As the low temperature condensate discharge progresses, the high temperature condensate close to the saturation temperature eventually flows into the steam trap 2 and continues to be discharged in the same manner.
On the other hand, a part of the condensate that passes through the lower surface of the disk 12 circulates in the variable pressure chamber 9, and the condensate that has circulated increases in temperature as the passing condensate temperature rises.
[0016]
At the end of the condensate discharge, steam is also discharged, and when the steam passes through the lower surface of the disk 12, the fluid velocity increases abruptly compared to when condensate, so that the lower surface of the disk 12 drops in pressure. As a result, the force in the valve opening direction (pressure of the fluid passing through) acting on the lower surface of the disk 12 is abruptly smaller than the force in the valve closing direction (pressure in the variable pressure air 9) acting on the upper surface of the disk 12. It becomes a state. If the valve closing state continues, the inside of the variable pressure chamber 9 will eventually cool and the pressure will drop, so the force in the closing direction acting on the upper surface of the disk 12 will decrease, and the disk 12 will be pushed up again to open the valve. In this way, the steam trap 2 automatically opens and closes intermittently due to an internal pressure difference, and condensate is discharged.
[0017]
At this time, the temperature of the condensate discharge passage 3 on the secondary side of the steam trap 2 is a certain temperature higher than the closed state or the resting state due to the intermittently discharged condensate and the heat radiation to the outside air. Therefore, the rotation amount of the output shaft 16 of the temperature sensor 14 for detecting the temperature is larger than that in the closed / resting state, and the display window 18 has a color display panel as shown in FIG. The green region 20G at 17 is exposed.
[0018]
Further, when the steam trap 2 of FIG. 6 is blown away, the steam in the primary side steam passage 1a leaks out to the secondary side as it is, so the temperature of the condensate discharge passage 3 is the saturation temperature of the primary side steam pressure. Or it becomes more than the saturation temperature of the secondary side pressure of a normal operation state. As a result, the amount of rotation of the output shaft 16 of the temperature sensor 14 that detects the temperature of the condensate discharge passage 3 becomes larger than that during normal operation. As shown, the red region 20R on the color display board 17 is exposed.
[0019]
Therefore, even a general person who does not grasp the operating principle of the steam trap 2 by visually observing the color regions 20B, 20G, 20R of the color display board 17 exposed from the display window 18 can determine the operating state of the steam trap 2. It is possible to easily diagnose suitability.
[0020]
In addition to the disc-type intermittent steam trap 2 as in the above-described embodiment, the present invention employs other systems such as a well-known bucket type that opens and closes the valve body by the difference in specific gravity between steam and condensate contained in the bucket. It can also be applied to intermittent steam traps.
[0021]
【The invention's effect】
As described above, the steam trap operation diagnosis apparatus of the present invention has a temperature sensor for detecting the temperature of the condensate discharge passage on the secondary side of the intermittent steam trap that is connected to the steam pipe and automatically opens and closes intermittently. This temperature sensor is equipped with color display means to display different colors for each temperature range, so depending on when the steam trap is in the closed / resting state, normal operating state, and blowing / steam leaking state The color display means of the temperature sensor displays the color of the temperature region corresponding to each state. Therefore, even a general person who does not understand the operating principle of the steam trap can easily diagnose the operating state of the steam trap by visually observing the difference in color displayed by the color display means.
[Brief description of the drawings]
FIG. 1A is a side view showing a part of a steam piping system provided with a steam trap operation diagnosis device according to an embodiment of the present invention, and FIG. 1B is a plan view of the main part of the operation diagnosis device. is there.
FIG. 2 is a longitudinal sectional view showing a schematic configuration of a part of the steam piping system.
FIG. 3 is an exploded perspective view of a part of the operation diagnosis apparatus.
FIG. 4 is a plan view of a color display board in the operation diagnosis apparatus.
FIG. 5 is a piping diagram showing a schematic configuration of a part of the steam piping system;
FIG. 6 is an explanatory view of the operation of the disc type intermittent steam trap.
FIG. 7 is an explanatory diagram of color display by the operation diagnosis device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Steam piping, 1a ... Steam passage (primary side passage), 2 ... Intermittent steam trap, 3 ... Condensate discharge passage (secondary side passage), 7 ... Steam trap operation diagnostic device, 14 ... Temperature sensor, 15 ... Sensor unit, 16 ... Output shaft, 17 ... Color display panel, 18 ... Display window, 20B, 20G, 20R ... Color region, B, G, R ... Color

Claims (2)

A temperature sensor for detecting the temperature of the condensate discharge passage is attached to the secondary side of the intermittent steam trap that is connected to the steam pipe and automatically opens and closes intermittently, and the intermittent steam in the temperature sensor and the condensate discharge passage is attached. An operation diagnostic apparatus for a steam trap, in which a heat radiating flange is interposed between the trap and the temperature sensor includes color display means for displaying a different color for each temperature region.   2. The temperature sensor according to claim 1, wherein the temperature sensor detects a temperature and rotates an output shaft, a color display panel in which a plurality of different colors are displayed in a circumferential direction and fixed to the output shaft, and the color display An apparatus for diagnosing operation of a steam trap, comprising: a display window exposing a portion of the panel with respect to a detected temperature.

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