JPS5930319Y2 - Disc type steam trap - Google Patents

Description

[Detailed explanation of the invention] In general, a disc-type steam trap has an inlet and an outlet arranged on the same line to facilitate piping, and the inner and outer ring seats on which the valve disc is seated and seated are arranged directly parallel to the above-mentioned population-outlet line. Therefore, the discharge hole from the inner and outer ring seats and the outlet communicate with each other through a curved passage.

Since the discharge flow of condensate from the discharge hole collides with the inner wall of this curved passage and changes its direction toward the outlet, the erosion is particularly severe in the portion along which the discharge flow changes direction.

In particular, when the main parts such as the valve and valve seat are made into a unit and the main body is made by casting, this corrosive action is severe, and if the part where the discharge flow hits and changes direction is made thick, it is likely to cause cavities. Therefore, there was no effective countermeasure against this erosive effect.

The present invention attempts to solve the above problem by providing several horizontal convex walls on the inner wall along which the discharge flow of the curved passage connecting the discharge hole and the outlet of the cast body changes direction. It is.

The several convex walls do not make the thickness of the wall of the curved passage uniformly thick, but instead protrude above the wall of the same thickness as before, so there are fewer cavities and it is easier to cast.

In addition, since the convex wall protrudes, the period until holes are formed in the wall due to the erosive action of the discharge flow is longer than in the past.

In addition, since the convex wall extends in a direction transverse to the direction of the discharge flow, the flow of the discharged fluid is disturbed by the convex wall, weakening the flow along the wall surface of the convex wall portion, and therefore causing erosion. be weakened.

The following description will be given based on the illustrated embodiment.

In the figure, 1 is a cast body having an inlet 2 and an outlet 3 on the same axis, and an opening 4 formed by an annular wall in the upper part.

Further, the inlet 2 communicates with the center of the opening 4 via the screen storage chamber 5.

Reference numeral 6 denotes a filtration cylinder disposed within the storage chamber 5, which is held by the shoulder of a holder 8 screwed onto the lower end of the main body 1 via a gasket 7.

Furthermore, on the inner wall that changes direction upward at right angles on the exit 3 side,
Several horizontal convex walls A are provided.

Reference numeral 9 denotes a valve seat member fitted into the opening 4 through a gasket 10, and an inner cover 11 screwed into the opening 4 closes the main body 1.
is pressed against the lower end surface of the opening 4.

Reference numeral 12 denotes a variable pressure chamber formed between the inner lid 11 and the valve seat member 9, in which a valve disk 13 is installed.

Reference numerals 14 and 15 denote double valve seats with inner and outer rings formed on the surface of the valve seat member 9 corresponding to the valve disk 13, and an inlet 2 is provided in the inner ring valve seat 14.
The opening end of the ejection hole 16 is formed to communicate with the side, and the opening end of the discharge hole 17 is formed which communicates with the outlet 3 side through a direction changing part in which a convex wall A is provided between the inner ring valve seat 14 and the outer ring valve seat 15. An open end is formed.

Further, between the outer periphery of the outer ring valve seat 15 and the inner lid 11, a bimetal ring 18 made of a circularly bent bimetal and a retaining ring 19 for preventing the bimetal ring 18 from coming off are arranged.

The bimetal ring 18 expands when the temperature is high and lowers the tapered portion 20 on the valve seat member 9 side (the state shown in the figure), and contracts and closes when the temperature is low to ascend the tapered portion 20 and pass through the retaining ring 19 to the square disk 13. are forcibly separated from the inner and outer ring valve seats 14 and 15.

Reference numeral 21 denotes a variable pressure chamber 1 disposed between the valve seat member 9 and the inner cover 11.
2 This is an airtight gasket.

Moreover, 22 is a protrusion that reinforces the abutting portion of the valve disk 13 on the inner wall of the inner lid 11.

Further, an outer cover 24 is screwed onto the outer periphery of the annular wall forming the opening 4 of the main body 1 via a gasket 23.

Reference numeral 25 denotes a circulation chamber formed between the outer cover 24, the main body 1, and the inner cover 11, and an inlet through the communication hole 26. Connects to the side.

27 is a rib for reinforcing the main body 1. Further, 28 is a pin that prevents the valve seat member 9 from rotating.

In the case of the above embodiment, in the open state in which the valve disc 13 is separated from the valve seats 14 and 15, the condensate flow flowing out from the discharge hole 17 to the outlet 3 side flows to the convex wall A of the outlet passage 3. As it flows along the convex wall, the flow velocity is slowed down, and the condensate flow that reached the convex wall A first is scattered and remains, buffering the collision of the subsequent condensate flow. be effectively protected from

Furthermore, it is not necessary to make the direction changing curved portion provided with the above-mentioned convex wall A thicker as an anti-erosion measure, and generation of casting bundles in the cast body 1 can be prevented.

As described above, according to the present invention, the inlet and the outlet are provided on the same axis, and the inner and outer ring valve seats on which the valve disk takes off and arrives at the berth are arranged in the above-mentioned population.
In a disc-type steam trap that is formed parallel to the outlet axis and has a structure in which the discharge hole from between the inner and outer ring valve seats communicates with the outlet side through the direction-changing curved section, erosion of the direction-changing curved section due to discharge is prevented. In addition, when casting the trap body, instead of uniformly increasing the thickness of the direction changing curved part, the thickness of the direction changing curved part is left as thin as in the past, and a convex wall is formed on it, thereby preventing defects in the casting industry. can be prevented.

[Brief explanation of the drawing]

The figure shows a cross-sectional view of a disc-type steam trap of one embodiment, in which 1 is a main body, 2 is an inlet, 3 is an outlet, 9 is a valve seat member,
11 is an inner lid, 12 is a variable pressure chamber, 13 is a valve disk, 14 is an inner ring valve seat, 15 is an outer ring valve seat, 16 is an ejection hole, 17 is a discharge hole, and 24 is an outer cover.

Claims (1)

[Scope of utility model registration request] In a disc-type steam trap, several horizontal convex walls are provided on the cast part that changes direction along the discharge flow on the inner wall of the curved passage connecting the discharge hole and the outlet between the inner and outer ring seats. Features a disc type steam trap.