JPH0468517B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a steam trap that automatically discharges condensate from steam-using equipment, steam piping, etc., and particularly relates to the structure of the valve port.

BACKGROUND ART Conventionally, there is a free-float type steam trap as shown in FIG. 2, for example. This has a lid 2 attached to a main body 1 with bolts 3 to form a trap housing. 4 is a gasket that maintains the airtightness of the joint between the main body 1 and the lid 2.

An inlet passage 5, which is piped to steam-using equipment (not shown), communicates through a cylindrical screen 6 to the upper part of a condensate sump chamber 7 within the housing. A spherical float 8 is housed in a free state in the condensate reservoir chamber 7, and floats up and down based on the difference in specific gravity between the float and the condensate accumulated in the reservoir chamber 7.

Reference numeral 9 denotes a valve seat member 12 that protrudes into the reservoir chamber 7 and forms a valve port 10 that is opened and closed by contact with the surface of the float 8. The valve seat member 9 is airtightly inserted into the lower part of the main body 1 via an O-ring 11. A valve seat holding member holds the valve seat member 9 with a shoulder portion 13, and is screwed onto the main body 1 from the outside via a gasket 14. Reference numeral 15 denotes a through hole through which the fluid flowing from the valve port 10 communicates with the discharge passage 17 through the rising passage 16.

Therefore, the condensate flowing in from the inlet passage 5 accumulates in the condensate reservoir chamber 7, and the float 8 ascends and descends according to the water level, opens and closes the valve port 10 of the valve seat member 9, and drains the condensate into the discharge passage 17. lead

As shown in FIG. 3a, the valve seat passage is composed of a small diameter valve port and a large diameter valve chamber. This is because if the diameter of the valve chamber is made the same as the diameter of the valve port, the resistance of the pipe becomes large and a large flow rate cannot be obtained.

On the other hand, if the valve diameter is increased, the valve closing force of the float becomes too large, so a large-diameter float with high buoyancy must be used, which increases the size of the trap as a whole. Therefore, the structure of the valve seat member must include a small diameter valve port and a large diameter valve chamber.

Problems to be Solved by the Invention As shown in FIG. 3a, high-speed fluid flows from part A of the small-diameter valve port 10 to the large-diameter valve chamber 20B while expanding its flux. At this time, a gentle vortex D is generated in the corner C of the valve chamber 20, and as a result, a snowdrift is formed in the C part. For this reason, foreign matter E such as dust and carbon in the condensate begins to collect and adhere to part C and accumulate (Fig. 3b).

This accumulated foreign matter E further grows into a deposit F as shown in FIG. 3c, and finally blocks the valve port 10, causing the problem that it no longer functions as a steam trap.

Therefore, a technical object of the present invention is to provide a structure in which foreign matter such as dirt does not accumulate inside the valve opening of the trap.

Means for Solving the Problems The technical means of the present invention taken to solve the above-mentioned problems is a steam trough comprising a valve port and a valve chamber formed on the downstream side of the valve port and having a diameter larger than the diameter of the valve port. In the valve seat member of the steam valve, a communication hole connecting the upstream side of the valve port and the downstream side of the valve port is provided within the range of the seal diameter of the valve port in the annular partition wall on the outer periphery of the valve port. This is the valve structure of the trap.

Function As explained above, high-speed fluid passes through the valve port,
The moment it exits the partition that forms the valve port, a pool of dust and other foreign matter tends to form in the deep part of the valve chamber side partition, but the communication hole provided in the annular partition allows the valve port to Since the high-pressure fluid on the upstream side flows into the cloud pool portion on the downstream side of the valve opening, the low pressure area in that area is relaxed and no snow pools occur. Therefore, foreign matter such as dust cannot adhere to it.

Furthermore, since the communication hole is provided within the range of the seal diameter of the valve port, when the valve port is blocked by the valve body and the valve is closed, no fluid flows through the communication hole. In other words, fluid passes through only when the valve port is opened, so fluid is not discharged unnecessarily.

Effects of the Invention According to the technical means of the present invention, foreign matter such as dust is not accumulated in the valve opening, and the steam trap can continue to operate satisfactorily.

This can be done very economically since it prevents foreign matter such as dirt from accumulating in the condensate that should be discharged without unnecessarily escaping fluid.

Examples Examples showing specific examples of the technical means of the present invention will be described. (See FIG. 1) The valve seat member shown in FIG. 1 is built into the steam trap shown in FIG. 2, and a description of its operation as a steam trap will be omitted.

The valve seat member 30 is partitioned into a valve port upstream side 33 and a valve port downstream side 34 by an annular partition member 31 that forms a valve port 32 . The upstream side 33 of the valve port has a seal diameter X and forms a valve seat surface 36 against which the float 35 abuts. The downstream side 34 of the valve port forms a valve chamber 37 and is provided with a through hole 38 toward the trap outlet side. A communication hole 42 connecting the upstream side surface 39 and the downstream side surface 40 of the partition wall portion 31 is opened. A plurality of communication holes 42 are provided in the annular wall 31 around the valve port 32 at equal intervals.

The action is as follows. The float 35 rises and falls according to the water level of the condensate to open and close the valve seat surface 36. In response, condensate flows into the valve port and enters the flow valve chamber 37 as a high-speed fluid.

High-speed fluid flows into the valve chamber 37 while expanding its flux, and a gentle vortex is generated on the downstream side surface 40 of the partition wall, causing foreign matter such as dirt to adhere, but at the same time as the float opens. Since the fluid flows into the downstream side surface 40 of the partition wall through the communication hole 42, that region is maintained at a high pressure, and foreign matter is blown away by the flow of the fluid itself. Therefore, no foreign matter is permanently deposited on the downstream side surface 40 of the partition wall, so that condensate continues to flow smoothly within the valve port 32.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a valve seat member according to an embodiment of the present invention;
Figure 2 is a cross-sectional view of a float type steam trap.
FIGS. 3a, 3b, and 3c are sectional views of conventional valve seat members. 1: Main body, 2: Lid, 5: Inlet passage, 8: Float, 9, 30: Valve seat member, 10, 32: Valve port, 2
0, 37: Valve chamber, 42: Communication hole.

Claims (1)

[Claims] 1. In a steam trap valve seat member consisting of a valve port and a valve chamber formed on the downstream side of the valve port and having a diameter larger than the valve port diameter, the seal diameter of the valve port is A steam trap valve structure characterized in that a communication hole connecting the upstream side of the valve port and the downstream side of the valve port is provided within the range.