JP2010117019A - Drain trap - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To determine whether clogging is caused in a valve port of a drain trap, or the clogging is caused in a pipe system upstream of the drain trap. <P>SOLUTION: A valve casing having a valve chest 5 inside is formed by joining a cover 4 to a body 3 having an inlet 1 and an outlet 2. The valve port 8 is formed between the valve chest 5 and the outlet 2. A bimetal laminated body 26 and a valve member 13 are arranged in the valve chest 5. A pressure gauge connecting port 31 communicating via a communicating passage 30 from between the inlet 1 of the body 3 and the valve chest 5 and connected with a pressure gauge, is arranged in the body 3. When the drain tap does not discharge a drain, pressure of the pressure gauge connected to the pressure gauge connecting port 31 is confirmed. When the pressure is the substantially same as operation pressure of the pipe system upstream of the drain trap, it is determined that the clogging is caused in the valve port 8 of the drain trap, and when the pressure is reduced more than the operation pressure of the pipe system upstream of the drain trap and is the substantially same as atmospheric pressure, it is determined that the clogging is caused in the pipe system upstream of the drain trap. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a drain trap that automatically discharges steam, compressed air, and drain generated in a gas piping system, and in particular, whether a valve port that is opened and closed by a valve member is clogged due to accumulation of foreign matter such as dust and scale. It relates to things that can be confirmed.

  The drain trap has a valve casing that forms an inlet, a valve chamber, and an outlet, a valve port that communicates between the valve chamber and the outlet is provided between the valve chamber and the outlet, and a valve member that opens and closes the valve port is disposed in the valve chamber. It is. In this drain trap, if the valve port that is opened and closed by the valve member becomes clogged due to the accumulation of foreign matter such as dust and scale, and the drain cannot be discharged, the operating efficiency of the steam-using equipment and the like decreases, so the drain is discharged. If you find a drain trap that has not been removed, you must remove it immediately and repair it or replace it with a new one.

However, in the above-described conventional drain trap, when the drain trap that has not drained the drain is removed and disassembled, there are relatively many normal cases in which no foreign matter accumulates on the valve opening and no clogging occurs. This is because clogging occurs in the piping system upstream from the drain trap, so that drain is not discharged from the drain trap, and there is a problem that unnecessary removal or replacement is originally performed.
JP-A-4-262194

  The problem to be solved is to provide a drain trap that can determine whether the drain trap valve port is clogged or whether it is clogged in the piping system upstream of the drain trap.

  The present invention provides a drain in which an inlet, a valve chamber, and an outlet are formed by a valve casing, a valve port that communicates the valve chamber and the outlet is provided between the valve chamber and the outlet, and a valve member that opens and closes the valve port is disposed in the valve chamber. The trap is characterized in that a pressure gauge connection port to which a pressure gauge is connected from between the inlet of the valve casing and the valve chamber is provided.

  In the present invention, when the drain trap does not discharge the drain, the pressure of the pressure gauge connected to the pressure gauge connection port is checked to check whether the drain trap valve port is clogged or upstream of the drain trap. It is possible to determine whether or not the piping system is clogged, so that an excellent effect of preventing unnecessary removal and replacement of the drain trap is produced.

  The drain trap of the present invention is provided with a pressure gauge connection port to which a pressure gauge is connected from between the inlet of the valve casing and the valve chamber. Therefore, if the drain trap is not discharging drainage, check the pressure of the pressure gauge connected to the pressure gauge connection port, so that the pressure between the inlet and the valve chamber is higher than that of the drain trap. If the pressure is almost the same, the fluid has flowed into the drain trap, so it can be determined that the drain trap valve port is clogged, and the pressure between the inlet and the valve chamber is a pipe upstream of the drain trap. If it is lower than the operating pressure of the system and is substantially the same as the atmospheric pressure, it can be determined that the pipe system upstream from the drain trap is clogged because the fluid has not flowed into the drain trap.

  An embodiment showing a specific example of the above technical means will be described (see FIG. 1). A lid 4 is screwed to a body 3 having an inlet 1 and an outlet 2 to form a valve casing having a valve chamber 5 therein. The inlet 1 communicates with the valve chamber 5 through the through hole 6, and the outlet 2 communicates with the valve body fitting hole 7, the valve port 8, and the through hole 9. The valve body fitting hole 7 and the valve port 8 are formed in the valve seat member 10 screwed to the main body 3. A screen 11 for restricting the flow direction of the fluid flowing from the inlet 1 into the valve chamber 5 and capturing foreign substances in the fluid is disposed. A valve shaft 12 is disposed opposite to the valve port 8. A conical valve member 13 for opening and closing the valve port 8 is integrally provided at the lower end of the valve shaft 12.

  The upper end side of the valve shaft 12 is movably fitted in a valve shaft fitting hole 18 of an adjusting rod 17 screwed to the lid 4 via an O-ring 16 so as to be able to advance and retract. The valve body fitting hole 7, the valve port 8, and the valve shaft fitting hole 18 are formed on the same shaft. An upper portion of the adjustment rod 17 protrudes from the lid 4, and a slit 19 is provided on the upper end surface of the adjustment rod 17 so that the tip of a tool such as a screwdriver fits. A lock nut 20 is attached to the protruding portion of the adjusting rod 17 to prevent loosening, and is covered with a cap 21. A spring receiver 24 is fixed to the central portion of the valve shaft 12, an intermediate member 25 having a substantially U-shaped cross section and a flange on the outer side of the upper end, and a spring receiver 24, which is displaceable to the valve shaft 12. Is brought into contact with the lower end surface of the mating member. Around the valve shaft 12, a bimetal laminate 26 and a flat washer 27 are disposed as a temperature sensitive member between the lower end surface of the adjusting rod 17 and the flange portion of the intermediate member 25. The bimetal laminate 26 is a pair of two bimetal disks combined with different bending directions, and a plurality of the bimetal disks are stacked. Between the upper end surface of the spring receiver 24 and the lower end surface of the flat washer 27, a valve body urging spring 28 that urges the spring receiver 24 toward the valve port 8 is disposed. A return spring 29 is disposed between the flange of the intermediate member 25 and the bottom wall of the valve chamber 5. The main body 3 is provided with a pressure gauge connection port 31 through which a pressure gauge is connected from the inlet 1 of the main body 3 to the valve chamber 5 through the communication passage 30.

  The fluid enters the valve chamber 5 from the inlet 1 through the through hole 6 and the screen 11, flows around the bimetal laminate 26, and flows out from the valve body fitting hole 7 and the valve port 8 through the through hole 9 to the outlet 2. To do. When the temperature of the surrounding fluid rises and the bimetal laminate 26 is heated to a high temperature, each bimetal disk is bent and the degree thereof increases, and the return spring 29 is compressed via the plain washer 27 and the intermediate member 25. While extending in the stacking direction. Along with this, the intermediate member 25 and the valve shaft 12 are displaced in the direction of the valve port 8, the opening degree of the valve port 8 gradually decreases, and the valve member 13 closes the valve port 8 at the end. When the higher temperature fluid flows into the valve chamber 5 after the valve member 13 closes the valve port 8, the bimetal laminate 26 further expands while compressing the return spring 29 and the valve body biasing spring 28. At this time, the intermediate member 25 is displaced in the direction of the valve port 8, but the valve shaft 12 is not displaced. If the temperature of the fluid in the valve chamber 5 decreases, the bending force of the bimetal laminate 26 decreases and is pushed back by the return spring 29 via the intermediate member 25. Accordingly, the intermediate member 25 and the valve shaft 12 are displaced away from the valve port 8, the valve member 13 opens the valve port 8, and the fluid in the valve chamber 5 is discharged to the outlet 2.

  When the drain trap does not discharge the drain, by checking the pressure of the pressure gauge connected to the pressure gauge connection port 31, the pressure between the inlet 1 and the valve chamber 5 is increased in the piping system upstream of the drain trap. If it is almost the same as the operating pressure, it can be determined that the drain trap valve port 8 is clogged, and the pressure between the inlet 1 and the valve chamber 5 is lower than the operating pressure of the piping system upstream of the drain trap. If it is almost the same as the atmospheric pressure, it can be determined that the piping system upstream of the drain trap is clogged.

  In the above embodiment, a bimetal type steam trap is exemplified, but the present invention can be applied to other types of steam traps such as a float type, an air trap or a gas trap.

Sectional drawing of the bimetal type steam trap of the Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Inlet 2 Outlet 3 Main body 4 Lid 5 Valve chamber 8 Valve port 13 Valve member 26 Bimetal laminated body 31 Pressure gauge connection port

Claims (1)

In the valve casing, an inlet, a valve chamber, and an outlet are formed, a valve port that communicates the valve chamber and the outlet is provided between the valve chamber and the outlet, and a valve member that opens and closes the valve port is disposed in the valve chamber. A drain trap characterized by comprising a pressure gauge connection port to which a pressure gauge is connected from between the inlet of the valve and the valve chamber.

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