JPS6321078B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention seeks to improve disc steam traps and, in particular, to advantageously prevent irregularities in their closing intervals to ensure proper operation at all times.

A disc type steam trap generally has two inner and outer ring seats partitioned on the same plane by an annular groove, and the inner periphery of the inner ring seat is limited by an inflow hole.
Then, prepare a separate sheet member with an outflow hole at the bottom of the annular groove, incorporate this into a trap body that has a pair of inlets and outlets, and allow the condensate led to the inlet to overflow into the inlet hole of the sheet member. In order to take advantage of the difference in thermal properties of the condensate that continues to arrive at a higher temperature by flowing out to the outlet through the outlet, a disk placed commonly on both the inner and outer wheel seats is used to connect the condensate to the rear cap. The flow of condensate is thermodynamically controlled based on an opposing relationship with the inflow pressure of condensate in the inflow hole using the intermediate pressure generated in the variable pressure chamber formed, thereby selectively draining only low-temperature condensate. Do this intermittently.

FIG. 1 illustrates a typical example of the general embodiment.

In the figure, 1 is a seat member, 2 is an inner ring seat, 3 is an outer ring seat, 4 is an annular groove, 5 is an inflow hole, 6 is an outflow hole, 7 is a trap body, 8 is an inlet, 9 is an outlet, and 10 is a strainer. , 11 is the disk,
12 is the rear cap, 13 is the transformation chamber, and 14
is the cover.

In this example, the seat member 1 has an outer peripheral screw of a back cap 12 having a hem circumference that matches the outer peripheral flange 15 of the seat member 1, and is screwed into the trap body 7, so that the inlet hole 5 communicates with the inlet, and the outlet hole 6 communicates with the outlet 9. Although shown is a case in which the cover 14 is restrained in position, the rear cap 12 is sometimes restrained by tightening force such as by screwing the cover 14 or bolting it.

In any case, the inflow hole 5
It is necessary to seal shortening leakage between the outlet hole 6 and the outlet hole 6, and it is also necessary to seal the variable pressure chamber 13 with respect to the outlet 9 on both the upper and lower surfaces of the flange 15 of the sheet member 1, so gaskets are installed here. g1, g2 and g3
applies.

In each of these gaskets, an annular body of organic polymeric material, such as tetrafluoroethylene resin or the like, is advantageously fitted to tightly seat the gasket within a recess in the inner ring that matches the cross-sectional outer ring of the gasket. Sealing grooves are usually provided on the bottom surface of the sheet member 1 and on the bottom end surface of the back cap 12, respectively.

FIG. 2a shows in more detail the conventional sheet member 1 fitted with gaskets g1, g2 which, under suitable interference, fit into their sealing grooves 16, 17. When the bottom surface of the sheet member 1 comes into contact with the mounting surface 7' on the trap body 7, the gasket is placed in a locking groove formed by a recess that matches the cross-sectional outer ring portion of the gasket so as to form a tight fit. It is advantageously used in the form of an annular body which provides a surface pressure and preferably has a rectangular cross-section as shown here.

In this way, proper and reliable sealing of the short-circuit leakage flow between the inflow hole 5 and the outflow hole 6 was achieved.
In this case, during continued use of the trap, it was occasionally experienced that the valve closing interval, that is, the closing interval from the completion of the condensate discharge operation to the resumption of the condensate discharge operation, was shortened.

Although the cause of this could not be determined, the inventor made a thorough study and found that, as illustrated in FIG. 2b, the sheet member 1
is firmly suppressed around the hem of the back cap 12, and the thermal expansion of the gasket g1 causes deformation of the seat member 1 such that the inner ring seat 2 rises up against the outer ring seat 3, and as a result, the disk 11
It was confirmed that the stable seating on the outer ring seat 3 was impaired, and the internal pressure of the variable voltage chamber 13 was released there, resulting in a poor interval.

Therefore, it is an object of the present invention to eliminate the cause of such interval failure.

The gist of this invention is to partition each inner and outer ring seat on the same plane by an annular groove, limit the inner periphery of the inner ring seat by an inflow hole, and provide an outflow hole at the bottom of the annular groove. The sheet member is assembled into a trap body having a pair of inlets and outlets, and the flow of condensate flowing from the inlet through the inlet hole of the sheet member, the outlet hole, and the outlet is controlled by the two inner and outer wheels depending on the temperature. In a disc-type steam trap that controls the intermediate pressure generated in the variable pressure chamber between the rear cap and the rear cap by a disc commonly placed on the seat, and intermittently controls the selective drainage of low-temperature condensate, the seat member A gasket made of an annular body of tetrafluoroethylene resin or similar seals the mounting surface of the trap body at least around the inflow hole, and the gasket is tightly inserted into the recess of the inner ring portion that matches the cross-sectional outer contour of this gasket. This disc-type steam trap prevents interval irregularities by providing a gap in a part of the contact surface with the groove wall of the sealing groove in which the gasket is housed to provide relief corresponding to the volumetric expansion at the operating temperature of the gasket.

Now, as shown in FIGS. 3a and 3b, by forming a slight notch 18 on the inner peripheral side of the sealing groove 16 to provide a gap between the contact surface between the gasket g1 and the groove wall of the sealing groove 16. , gasket g as shown in Figure 3b.
By providing an escape where the thermal expansion of 1 is absorbed by the protrusion g' into the notch 18, the cause of the interval failure due to the deformation of the sheet member 1 as described above can be unexpectedly and easily and completely eliminated. It was.

Incidentally, since almost the same thermal expansion occurs in the gasket g2, it is more desirable to provide the sealing groove 17 with a notch 19 as shown in FIG.

The notch 19 may be provided in contact with the outer periphery of the sealing groove 17, as indicated by 19' in FIG. It is also more desirable to protect gasket g1 from contact with hot condensate by 20.

In each of the above embodiments, notches are provided in the groove wall surfaces of the sealing grooves 16 and 17, but instead of this, the notches are provided in the contact surfaces of the sealing grooves of the gaskets g1 and g2 with respect to the groove walls. It is also possible to form a notch.

As described above, according to the present invention, problems in the closing interval of a disc type steam trap can be corrected.
Appropriate and reliable prevention ensures uniform trap operation.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a disc type steam trap, Figs. 2a and b are explanatory diagrams showing the cause of disturbance in the closing interval, and Figs. The explanatory drawings shown, FIG. 4, and FIG. 5 are sectional views of sheet members showing different embodiments. DESCRIPTION OF SYMBOLS 1... Seat member, 2... Inner ring seat, 3... Outer ring seat, 4... Annular groove, 5... Inflow hole, 6... Outflow hole, 7... Trap body, 8... Inlet, 9...
Outlet, 11... Disc, 12... Rear cap, 13... Transformation chamber, 16, 17... Sealing groove, 1
8, 18', 19, 19'... Gap (notch) providing relief, g1, g2... Gasket.

Claims (1)

[Claims] 1. A sheet member in which the inner and outer double ring seats are divided on the same plane by an annular groove, the inner periphery of the inner ring seat is limited by an inflow hole, and an outflow hole is formed at the bottom of the annular groove, Built into a trap body having a pair of inlet and outlet, the flow of condensate flowing from the inlet, through the inlet hole of the sheet member, through the outlet hole, and the outlet.
Depending on the temperature, the intermediate pressure generated in the variable pressure chamber between the rear cap and the rear cap is controlled by a disk commonly placed on both the inner and outer wheel seats, and selective drainage of low-temperature condensate is controlled intermittently. In a disc type steam trap, a gasket made of an annular body of tetrafluoroethylene resin or similar seals at least around the inflow hole on the mounting surface of the sheet member against the trap body, and a gasket that matches the cross-sectional outer contour of this gasket. A gap is provided in a part of the contact surface between the sealing groove and the groove wall, which tightly houses the gasket in the recess of the inner ring part, to provide relief corresponding to the volumetric expansion at the operating temperature of the gasket, thereby preventing interval irregularities. Disc type steam trap.