JP2012127432A - Operation state detecting device for valves - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an operation state detecting device for a steam trap having a sensor unit capable of precisely detecting a using steam pressure of steam pipework where the steam trap is arranged.SOLUTION: The sensor unit 18 is constituted of an attaching tool 14 attached to inlet pipework 13 forming a trap inlet 1 of a body 3 of a steam trap, a pressure sensor 15 attached to the attaching tool 14, a vibration sensor 16 attached to the attaching tool 14, and a temperature sensor 17 attached to the attaching tool 14. The using steam pressure of the steam pipework where the steam trap is arranged can be directly detected by the pressure sensor 15 and the using steam pressure of the steam pipework where the steam trap is arranged can be precisely detected by attaching the pressure 15 in communication from the steam pipework where the steam trap is arranged to the attaching tool 14 attached to the body 3 of the steam trap.

Description

The present invention relates to a valve operation state detection device that detects the operation state of valves, such as valves and steam traps, used in various fluid piping systems such as factories and plants.

A conventional valve operating state detecting device is disclosed in, for example, Patent Document 1. This valve operation state detection device is a steam trap operation state detection device that is pressed against the outer surface of the steam trap casing to detect the vibration of the steam trap, and a steam sensor attached to the tip of the vibration sensor. The sensor unit is composed of a temperature sensor that detects the temperature of the trap, and the presence or absence of steam leakage is determined from the detected vibration value detected by the vibration sensor, and the detected temperature value and reference temperature value detected by the temperature sensor It is made to be able to judge the defect of the condensate discharge function.

Japanese Patent Publication No. 5-14839

The above-mentioned conventional valve operating state detection device not only detects the presence or absence of steam leakage by manually entering the operating steam pressure of the steam pipe where the steam trap is installed and setting the reference temperature value from the saturated steam temperature. This is to determine the capacity shortage that does not allow the condensate to be discharged as a condensate discharge function failure or the loss of the condensate discharge function. There is a problem that it is not possible to correctly discriminate between the above and a problem that it is not possible to correctly distinguish between a dwell and a pause in which no steam is supplied to the steam trap.

Therefore, the problem to be solved by the present invention is to provide a valve operating state detection device including a sensor unit that can accurately detect the working pressure of a pipe in which valves are installed.

In order to solve the above-described problems, the valve operating state detection device of the present invention includes a fitting attached to a casing of the valves, a pressure sensor attached to the fitting and communicated from a pipe in which the valves are installed, and The sensor unit is composed of a vibration sensor that is attached to the fixture and detects vibrations of the valves, and a temperature sensor that is attached to the fixture and detects the temperature of the valves.

According to the present invention, the pressure sensor connected to the valve on which the valves are installed is attached to the fitting attached to the valve casing, thereby directly detecting the working pressure of the pipe on which the valves are installed. This produces an excellent effect that the working pressure of the piping in which valves are installed can be accurately detected.

It is sectional drawing of the steam trap which shows embodiment of the operating state detection apparatus of the valves of this invention.

Hereinafter, an embodiment of the present invention will be described with reference to FIG. FIG. 1 shows a float-type steam trap, and a steam trap casing has a main body 3 having a trap inlet 1 connected to a steam pipe and a trap outlet 2 for discharging separated condensate in the trap, and an upper opening of the main body 3. And a lid 4 for closing the cover. The casing has a valve chamber 6 which is always in communication with the trap inlet 1 and in communication with the trap outlet 2 through the lower valve port 5.

The valve chamber 6 is internally provided with a spherical float 7 that opens and closes the lower valve port 5 by vertical movement accompanying fluctuations in the water level of the indoor condensate. In the normal use state where the condensate flows in from the trap inlet 1 along with steam, When the lower valve port 5 is submerged in the condensate in the valve chamber, the degree of opening is adjusted by the float 7 in accordance with the amount of condensate inflow. 5 is continuously separated and discharged to the trap outlet 2. Further, when the inflow of condensate from the trap inlet 1 ceases, the lower valve port 5 is closed by the float 7 in a state where it is submerged in the indoor condensate whose water level has been lowered, and steam leaks due to the blockage of the lower valve port 5 due to this submergence. Is definitely prevented. Condensate and steam flow into the valve chamber 6 from the trap inlet 1 through the filter 8 and the float cover 9 that trap foreign matter that causes the opening and closing valve failure of the lower valve port 5.

An upper valve port 10 is formed in the lid 4, and an upper valve body 11 that is opened and closed by a temperature sensing element is provided in the upper part of the valve chamber 6, and when air flows from the trap inlet 1, The upper valve port 10 is opened by the opening operation of the upper valve body 11 by the operation of the temperature sensing element toward the temperature lowering side, and the inflow air is rapidly discharged through the upper valve port 10. When hot steam and condensate flow from the trap inlet 1, the upper valve port 10 is closed by the closing operation of the upper valve body 11 by the operation of the temperature sensing element toward the temperature rise side, and the normal recovery is performed. Return to water separation.

The operating state detection device 12 includes a fixture 14 attached to an inlet pipe 13 forming the trap inlet 1 of the main body 3, a pressure sensor 15 attached to the fixture 14, a vibration sensor 16 attached to the fixture 14, and an attachment. A sensor unit 18 is constituted by the temperature sensor 17 attached to the tool 14. The pressure sensor 15 includes a diaphragm 15a as a pressure sensing part communicating with the trap inlet 1 of the main body 3 communicating from the steam pipe provided with the steam trap through the pressure introduction passage 19, and a strain gauge 15b integrally attached to the diaphragm 15a. The steam pressure used in the steam pipe is directly detected by outputting the detection signal of the strain gauge 15b to the terminal 20 through a lead. The vibration sensor 16 includes a vibration sensing element 16a made of a piezoelectric element, a transmission rod 16b that transmits the vibration of the steam trap to the vibration sensing device 16a, and a spring 16c that presses the transmission rod 16b against the outer surface of the inlet pipe 13. The detection signal of the vibration sensing element 16a is output to the terminal 21 through a lead. The temperature sensor 17 includes a temperature sensing element 17a made of a resistance temperature detector element, is disposed so as to protrude into the pressure introduction passage 19, and outputs a detection signal of the temperature sensing element 17a to the terminal 22 through a lead. By directly detecting the temperature of the steam pipe.

By sending the output signals of the terminals 20, 21, and 22 to the determiner through a lead (not shown) by the cable 23 or wireless transmission means, the presence or absence of steam leakage is determined from the detected vibration value detected by the vibration sensor 16 in the determiner. To do. If no pressure is detected by the pressure sensor 15, it is determined that the operation is stopped, and the first reference temperature value and the second reference temperature value lower than the first reference temperature value are determined from the saturated steam temperature based on the detected pressure value detected by the pressure sensor 15. A reference temperature value is set, and if the detected temperature value detected by the temperature sensor 17 is less than the second reference temperature value, it is determined that the detected temperature value is over, and the detected temperature value detected by the temperature sensor 17 is greater than or equal to the second reference temperature value and If it is less than the first reference temperature value, it is determined that the capacity is insufficient.

INDUSTRIAL APPLICABILITY The present invention can be used for an operating state detection device for valves that detects the operating state of valves such as valves and steam traps used in various fluid piping systems such as factories and plants.

DESCRIPTION OF SYMBOLS 1 Trap inlet 2 Trap outlet 3 Main body 4 Lid 5 Lower valve port 6 Valve chamber 7 Float 10 Upper valve port 11 Upper valve body 12 Operation state detection apparatus 13 Inlet piping 14 Mounting tool 15 Pressure sensor 16 Vibration sensor 17 Temperature sensor 18 Sensor unit

Claims (1)

A fitting attached to the casing of the valves, a pressure sensor connected to the steam pipe attached to the fitting and the valves, a vibration sensor attached to the fitting and detecting vibrations of the valves, and a fitting An apparatus for detecting an operating state of valves, wherein a sensor unit is constituted by a temperature sensor that is attached and detects the temperature of the valves.

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