JP2741305B2 - Disc type steam trap - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steam trap for automatically discharging condensate generated in a steam piping system.
The present invention relates to a disk type steam trap that opens and closes a valve disk in response to a pressure change in a variable pressure chamber, that is, a thermodynamic steam chamber.

[0002]

2. Description of the Related Art An example of a conventional disk type steam trap is disclosed in Japanese Utility Model Laid-Open No. 3-130997. In this method, a transformation chamber is formed inside the main body and the lid, and a valve seat surface including inner and outer ring valve seats is formed at an opening end of the transformation chamber on the inlet and outlet, and an annular groove is formed between the inner and outer ring valve seats. A single discharge hole was opened from the annular groove, the variable pressure chamber was communicated with the outlet, and an orifice smaller than the annular groove was formed above the discharge hole of the annular groove, and a valve disk was arranged in the variable pressure chamber. By automatically controlling the valve disc by the pressure change of the variable pressure chamber and taking it off and on the valve seat surface, the condensate water is automatically discharged, and the small diameter orifice is provided, so that the lower face of the valve disc is provided. The flow velocity of the exhaust flow flowing through the valve disk becomes uniform, and the valve disk can be opened in parallel with the valve seat surface.

[0003]

In the above-mentioned conventional disk type steam trap, since the valve disk can be opened in parallel, there is little uneven wear of the valve disk and a long life can be obtained. In this case, there is a problem that the discharge flow rate is reduced and condensed water is retained at the inlet side of the trap. Also, the disk type steam trap originally had a tendency to accumulate condensed water at the inlet side because of the structure in which the valve is opened only when the steam pressure in the variable pressure chamber is reduced to a predetermined value due to heat radiation or the like. If condensed water stays at the inlet side of the trap, condensed water also stays in the steam-using device connected to the trap, and the thermal efficiency of the steam-using device decreases.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a disk type steam trap in which the condensate does not stay as much as possible on the inlet side and the valve disk is opened in parallel to prevent uneven wear of the valve disk. .

[0005]

According to the technical means of the present invention taken to solve the above technical problem, a cover member is attached to a main body having an inlet and an outlet, and the inlet and the outlet are opened inside. A variable pressure chamber is formed, a valve seat surface including inner and outer ring valve seats is formed at the opening end of the inlet and the outlet at the variable pressure chamber side, an annular groove is formed between the inner and outer ring valve seat surfaces, and a valve seat of the inner and outer ring valve seats is formed. A plurality of through holes are formed in the inner ring valve seat to communicate with the inlet, and the area of the inlet side through hole among the plurality of through holes is changed to the outlet. A plurality of discharge holes are formed in an annular groove facing the plurality of through-holes and formed to be larger than the area of the side through-hole.

[0006]

The operation of the above technical means is as follows.
By forming a plurality of through holes between the inlet and the transformation chamber, the area of this through hole is larger on the inlet side than on the outlet side,
The amount of fluid flowing down from the through hole on the outlet side to the outlet via the discharge hole is smaller than the amount of fluid flowing down from the through hole on the inlet side to the outlet via the discharge hole, and the flow velocity is reduced by the reduced amount. The flow velocity of the discharge flow flowing through the lower surface of the valve disk becomes uniform, so that the valve disk can be opened in parallel. In addition, since the through hole area of the inner ring valve seat surface is not targeted on the inlet side and the outlet side, a valve opening moment due to the inlet pressure acts on the valve disc, and the valve opening moment is equivalent to the conventional unit. The valve disc can be opened prematurely as compared with the one through hole, and condensate does not stay.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment showing a specific example of the above technical means will be described (see FIGS. 1 and 2). An inlet 2 and an outlet 3 are formed on the same axis of the main body 1, and a transformation chamber 4 communicating with the inlet 2 and the outlet 3 is formed by the lid member 5 and the main body 1. An inner ring 6 and an outer ring 7 are formed concentrically at the opening ends of the inlet 2 and the outlet 3 on the side of the transformer chamber 4, and the upper end is a valve seat surface 8. A disc-shaped valve disk 9 is arranged on the valve seat surface 8. The inlet 2 and the transformer chamber 4 communicate with each other through a plurality of through holes 10, 11, 12 formed in the inner race 6.
The through holes 10 and 11 are arranged on the inlet 2 side from the center of the inner ring 6, and the through hole 12 is arranged on the outlet 3 side. Through holes 10, 1
The opening area of 1 is formed larger than the area of the through hole 12. An annular groove 13 is formed between the inner ring 6 and the outer ring 7, and discharge holes 15, 16, 17 communicating with the outlet 3 are provided at positions facing the through holes 10, 11, 12.

Next, the operation will be described. When steam does not accumulate in the variable pressure chamber 4, the pressure of the condensate flowing from the inlet 2 acts on the valve disc 9 through the through holes 10, 11, and 12 to open the valve disc 9. 9 discharges the condensed water from the valve seat surface 8 to the outlet 3 through the discharge holes 15, 16 and 17. When the condensate discharge is completed and steam starts to flow from the inlet 2, the steam immediately fills the variable pressure chamber 4 and flows down the lower surface of the valve disk 9 at high speed. The valve disk 9 is seated on the valve seat surface 8 when it has fallen. In this case, the valve closing force is such that the valve disc 9 is loaded in the direction of the valve seat 8 by the steam pressure in the variable pressure chamber 4 and the valve disc 9 is opened by the inlet 2 steam pressure from the through holes 10, 11 and 12. It occurs due to the difference between the force applied in the valve direction.

When the pressure of the steam retained in the variable pressure chamber 4 decreases due to heat radiation or the like, the force of pressing the valve disk 9 against the valve seat 8 also decreases. This valve closing force is
When the valve opening force acting from 11, 12 is reduced, the valve disc 9 opens. In the present embodiment, the through holes 10,
A plurality of 11 and 12 are formed in the inner ring 6, and the inlet 2 side is formed large and the outlet 3 side is formed asymmetrically with respect to the center of the inner ring 6 and opposed to the through holes 10, 11 and 12. Similarly, a plurality of discharge holes 15, 16,
With the formation of 17, the flow velocity of the fluid passing through the lower surface of the valve disk 9 becomes substantially uniform, and the valve disk 9 opens in parallel without tilting, thereby preventing uneven wear of the valve disk 9. Further, when the valve disk 9 is opened, the valve disk 9 receives a valve opening moment due to the valve opening force due to the pressure at the inlet 2 acting from the through holes 10, 11, 12 so that a single through hole is located at the center. The valve can be opened prematurely as compared with the conventional one that penetrates, and condensate does not stay on the inlet 2 side.

[0010]

As described above, according to the present invention, the valve disc is opened prematurely by the valve opening moment acting on the valve disc due to the inlet pressure, and condensate is condensed on the inlet side of the trap. No more stagnation. In addition, by making the area of the through hole from the inlet to the transformer chamber smaller on the outlet side than on the inlet side, the flow velocity on the lower surface of the valve disk becomes uniform, and the valve disk can be opened in parallel. The life can be extended without causing uneven wear.

[Brief description of the drawings]

FIG. 1 is a sectional view of an embodiment of a disk type steam trap of the present invention.

FIG. 2 is a partial cross-sectional view taken along line AA in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body 2 Inlet 3 Outlet 4 Transformation chamber 5 Lid member 6 Inner ring 7 Outer ring 8 Valve seat surface 9 Valve disk 10, 11, 12 Through hole 13 Annular groove 15, 16, 17 Discharge hole

Claims (1)

(57) [Claims] 1. A transformation chamber having an inlet and an outlet formed therein by attaching a lid member to a main body having an inlet and an outlet formed therein.
Forming a valve seat surface comprising inner and outer ring valve seats at the opening end of the inlet and outlet at the transformer chamber side, forming an annular groove between the inner and outer ring valve seat surfaces,
In a variable pressure chamber in which a valve disk that is separated from and seated on the valve seat surface of the inner and outer ring valve seats is formed with a plurality of through holes in the inner ring valve seat portion and communicates with the inlet, the inlet side of the plurality of through holes is A disc type steam trap wherein the area of the through hole is formed larger than the area of the outlet side through hole, and a plurality of discharge holes are similarly formed in an annular groove facing the plurality of through holes.