JPH01158294A - Valve port structure of steam trap - Google Patents

Abstract

PURPOSE: To prevent foreign matter such as waste from piling up in a valve port and a valve chamber by arranging a plurality of partition plates with orifices perforated in the valve chamber. CONSTITUTION: Partition plates 39-41 with orifices 36-38 perforated are arranged in an equally spaced way in a valve chamber 32. In this way, when high speed fluid flows from a valve port 31 to the valve chamber 32, the speed of the high speed fluid is reduced by the partition plates 39-41, therefore drift due to flow speed does not occur in the valve chamber 32. Thus it is possible to prevent foreign matter such as waste from piling up in the valve port 31 and the valve chamber 32.

Description

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

BACKGROUND OF THE INVENTION Conventionally, there is a free-float type steam trap as shown in FIG. 2, for example. In this case, a lid 2 is 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.

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

9 is a valve seat member which projects into the reservoir chamber 7 to form a valve port 10 which is opened and closed by contact with the surface of the float 8; This 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 passes through the rising passage 16 and communicates with the discharge passage 17 .

Therefore, the condensate flowing in from the inlet passage 5 accumulates in the condensate reservoir 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 guides the condensate to the discharge passage 17. .

The valve seat structure is composed of a small diameter valve port and a large diameter valve chamber, as shown in FIG. 3(a). 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, and therefore a large diameter float with high buoyancy must be used, which results in an increase in the size of the trap body. 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. 3(a), high-speed fluid flows from part A of the small-diameter valve port 10 to part B of the large-diameter valve chamber 20 while expanding its flux. At this time, a gentle vortex is generated in the corner C of the valve chamber, and as a result, a snowdrift is formed in the C part. Therefore, foreign matter E such as dust and carbon in the condensate gathers in the 0 part and begins to adhere and accumulate (Fig. 3(b)).

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

Therefore, a technical problem of the present invention is to provide a structure that has a valve port and a valve chamber of different diameters, but does not allow foreign matter such as dust to accumulate inside the valve port.

Means for Solving the Problems The technical means of the present invention taken to solve the above-mentioned problems is a steam generator comprising a valve port and a valve chamber formed downstream of the valve port and having a diameter larger than the valve port diameter. This is a valve port structure for a steam trap characterized in that, in the valve seat member of the trap, partition plates each having an orifice are arranged in multiple stages within the valve chamber.

The opening positions of the orifices into the partition plate may be such that the lines connecting the respective orifices are parallel to the central axis of the valve chamber, but they may also be opened at different levels instead of being parallel.

Since the valve chamber is divided into multiple parts by a partition plate with an open working orifice, the fluid that flows into the valve port at high pressure and high speed has its pressure and flow rate reduced in the first valve chamber, and then enters the next valve chamber. further reduced. Thereafter, the fluid is gradually reduced and the initial pressure is not maintained in the last valve chamber, and the flow velocity when it flows out from the last orifice is slower to some extent than when it flows out from the first valve port. Therefore, the phenomenon described above does not occur due to the influence of the fluid flowing out from the valve port and each orifice. In other words, since the high-speed fluid does not cause a pool, foreign matter such as dust contained in the fluid flows out without adhering to the inside of the valve port or the inside of the valve chamber.

Effects of the Invention According to the technical means of the present invention, foreign matter such as dust will not accumulate in the valve port, and the steam trap will continue to operate satisfactorily.

Furthermore, if a single partition plate provided with an orifice is used, the diameter of the orifice must be made small in order to provide resistance, and if this is done, it is likely to be blocked by foreign matter such as dust. However, according to the method of the present application, the partition plates are multi-staged to increase the resistance, so the diameter of each orifice can be increased.
There is no need to worry about garbage clogging.

Example An example showing a specific example 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 formed from a small diameter valve port 31 and a large diameter valve chamber 32. A valve seat surface 33 is formed on the upstream side of the valve port 31,
The float 34 comes into contact. The connecting portion between the valve port 31 and the valve seat surface 33 is provided with an R surface 35 to reduce flow path resistance. Valve chamber 3
The secondary side of the trap 2 is opened with a through hole 45 directed toward the outlet side of the trap.

In the valve chamber 32, partition plates 39, 40, 41 with orifices 36, 37, 38 are arranged at equal intervals, and the first valve chamber 4
2. Second valve chamber 43. A third valve chamber 44 is formed. The diameter of each orifice is the same as the diameter of the valve port 31.

The opening positions of the orifices are set at different levels so that the line connecting the individual orifices is not parallel to the central axis of the valve port and the valve chamber. In this way, the resistance of the fluid can be increased, and the orifice can be made larger accordingly. Although three partition plates were used here, more may be used.

The action is as follows. The float 34 rises and falls according to the water level of the condensate to open and close the valve seat surface 33. Correspondingly, high-pressure, high-speed fluid enters the first valve chamber 42 from the valve port 31 and its pressure and velocity are reduced.

It then passes through the orifice 36 and enters the second valve chamber 43 where it is further reduced. Thereafter, it enters the third valve chamber 44 in the same manner, and both pressure and velocity are reduced compared to the initial state.

Therefore, since the fluid does not flow at high speed in each valve chamber, no pooling occurs due to the flow velocity, the pressure is balanced, and foreign matter such as dust does not adhere. Further, since the pressure and flow velocity of the fluid exiting the orifice 38 of the partition plate 41 are reduced, even if it enters the wide valve chamber 32, no eddies or pools are generated and the fluid flows without any influence.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a valve seat member according to an embodiment of the present invention, Fig. 2 is a sectional view of a float type steam trap, and Fig. 3 (a>(
b) and (c) are cross-sectional views of conventional valve seat members. 1: Main body 2: Lid 5: Inlet passage 8: Float 9.30: Valve seat member 10, 31: Valve port 20.32:
Valve chamber 39, 40, 41: Partition plate 36, 37, 38
Niorifice-no-Tashya Station

Claims (1)

[Claims] 1. In the valve seat member of the steam trap, which consists 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, partition plates with orifices opened are arranged in multiple stages within the valve chamber. A steam trap valve structure featuring: