JPS6244159B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a disc type steam trap,
The present invention relates to a disc steam trap having means for preventing the valve disc from seating, particularly at low ambient temperatures. This type of trap is excellent for quickly discharging low-temperature condensate and air when starting up steam-using equipment, and the trap's heat dissipation cooling also prevents air problems such as air filling the transformer chamber and making it impossible to open the valve. The valve disc is forced open and the problem can be resolved.

FIG. 3 shows the main parts of a conventional disk-type steam trap. A conical tapered surface 22 is formed on the outer circumference of the outer ring valve seat 21, and the bimetal ring 2
3 is placed. The bimetal ring 23 is a band-shaped ring with ends formed by bending a strip of bimetal, and when the temperature is high, it expands and descends along the tapered surface 22, and when it is low, it contracts and closes and moves upward along the tapered surface 22. This prevents the valve disk 25 from seating via the retaining ring 24 described below. The retaining ring 24 prevents malfunction caused by the bimetal ring 23 pinching the valve disk 25. If an air disturbance occurs and the valve cannot be opened, the inflow of condensate from the inlet side 27 is cut off, heat supply is cut off and the inside of the pressure change chamber 26 is cooled by heat radiation, and the bimetal ring 23 is closed to the pressure change chamber 26. When the inside of the variable pressure chamber 26 is cooled to a temperature lower than a predetermined temperature, it moves upward along the tapered surface 22, forces the valve disk 25 to take off its seat, and discharges the air in the variable pressure chamber 26 to the outlet side 28 to eliminate air obstruction. Eliminate.

However, in conventional traps, when the inside of the pressure transformation chamber 26 is sufficiently hot and the bimetal ring 23 is expanded, the valve disk 25 collides with the retaining ring 24 each time it operates, or the retaining ring 24 shakes violently. There was a problem in that the impact caused by these acts on the bimetal ring 23, and the corner of the lower end of the bimetal ring 23 that comes into contact with the tapered surface 22 is severely worn. For this reason, in the conventional trap, the action of the bimetal ring 23 was lost in a relatively short period of time.

Therefore, the technical problem of the present invention is to prevent the bimetal ring from being worn out by the impact caused by the opening/closing operation of the valve disk when the temperature inside the variable pressure chamber is high.

The technical means of the present invention taken to solve the above-mentioned technical problems is to form a variable pressure chamber inside the main body and the lid, and to open an ejection hole in the center of the end of the main body on the variable pressure chamber side to serve as an inlet. The variable pressure chambers are connected to each other, an annular groove is provided around the outer circumference of the nozzle, an inner ring valve seat is formed between the ejection hole and the annular groove, an outer ring valve seat is formed around the outer periphery of the annular groove, and a discharge hole is formed from the annular groove. In a valve disc that opens and communicates the variable pressure chamber with the outlet, and in which a valve disc that seats and separates from the valve seat surface consisting of an inner ring valve seat and an outer ring valve seat is placed in the variable voltage chamber, an annular bimetallic accommodation groove is provided in the outer ring valve seat. The outer periphery of the bimetal accommodation groove is provided with a bimetal protection seat means, the valve disc is formed in a size that allows it to sit on and off from the inner ring valve seat, the outer ring valve seat, and the bimetal protection seat means. An annular bimetal ring is arranged, a slope wall means is formed in the bimetal housing groove, and the expansion/contraction deformation of the bimetal ring and the slope wall means prevent the valve disk from seating at low temperatures.

The effects of the above technical means are as follows.

At high temperatures, the bimetal ring sticks to the outer circumference or inner circumferential wall of the annular bimetal housing groove and remains stationary due to its expansion or contraction action.
It does not come into contact with the valve disk. The valve disk collides with the bimetal protection seat means (the outer ring valve seat around the outside of the bimetallic housing groove), and since the bimetal ring does not move due to this collision, the impact does not reach the bimetal ring, and the bimetal ring Wear is significantly reduced.

The present invention produces the following unique effects.

In the case where a bimetal ring is arranged in the annular groove between the inner ring valve seat and the outer ring valve seat as in Japanese Patent Application Laid-Open No. 47-13734, a positioning hole is provided so as not to block the discharge hole leading to the outlet. It is necessary to provide a protrusion on the bimetal ring. Furthermore, the outer ring valve seat is likely to wear out due to the looseness of the valve disk. When the outer ring valve seat wears out, the pressure inside the variable pressure chamber escapes from the discharge hole when the valve is closed, making it impossible to maintain the valve closed. Furthermore, since the bimetal ring is disposed in the annular groove, the diameter of the bimetal ring is small, and the force for forcing the valve to open is weak.

In the present invention, since the bimetal ring is disposed in the bimetal accommodating groove formed in the outer ring valve seat, the discharge hole is not blocked, and there is no need for a means to prevent this. Additionally, the bimetal ring has a large diameter and can exert a large amount of force. Furthermore, since the bimetal protection seat is located on the outside of the bimetal ring, even if the valve disc rattles, the bimetal protection seat receives the impact and the outer ring valve seat is less likely to wear out. Even if the bimetal protection seat wears out, the pressure inside the variable pressure chamber will not flow out to the outlet side, so the valve will not open.

In order to more clearly illustrate the invention, the illustrated embodiments will now be described in detail. In Figure 1, 1 is the main body,
Inlet 4 and outlet 5 provided on the same axis at both left and right ends
and has. A screw 15 is cut into the upper part of the main body 1, and the lid 2 is screwed onto the top of the main body 1 in an airtight manner through a gasket 3. Reference numeral 8 indicates a variable pressure chamber which is a substantially cylindrical space formed between the main body 1 and the lid 2, and a disk-shaped valve disk 9 is disposed within the variable pressure chamber 8.
Furthermore, the main body 1 is provided with a jet hole 6 that communicates the inlet 4 and the variable pressure chamber 8, and a discharge hole 7 that communicates the variable pressure chamber 8 with the outlet 5, and the condensate is discharged to the outlet 5 side along this route. Ru. As shown in the plan view of FIG. 2, the surface of the main body 1 that corresponds to the variable pressure chamber 8 has a valve seat 1 with double inner and outer rings arranged concentrically.
0 and 11 are formed, and a discharge hole 7 opens in an annular groove 16 between the valve seats 10 and 11. The outer ring valve seat 11 has a larger contact area with the valve disk 9 than conventional valve seats, has an annular bimetallic housing groove 12 in its center, and has a first outer ring 11a and a second outer ring 11b.
(bimetal protective seat). A conical tapered surface 14 is provided on the inner wall bottom (bottom side) of this housing groove 12, and a bimetal ring 13 is disposed thereon.

Thus, when the bimetal ring 13 is in the expanded state, it descends along the tapered surface 14 as shown in the figure and sticks to the outer surface of the housing groove 12, and the expansion force of the bimetal ring 13 itself is the force that maintains this posture. As a result, the bimetal ring 13 is reliably held without being vibrated by the impact force when the valve disk 9 is moved into and out of the seat. In addition, in a disc type steam trap, the larger the contact area of the outer ring valve seat with the valve disc, the more the relationship between the pressure receiving area and the area of the water seal formed between this valve seat surface and the valve disc changes. Due to this, the operating cycle is long and the impact force when seating and unseating tends to be alleviated. Therefore, an outer ring valve seat 11 having a large contact area with the valve disk 9 and having a housing groove 12 as in this embodiment is used. This is to reduce the impact force when the valve disk 9 is seated and unseated, and to prevent the bimetal ring 13 from being vibrated by the impact. Since the bimetal protection seat on which the valve disk is seated is located outside the bimetal housing groove, there is little risk of the bimetal ring pinching the valve disk 9 and causing inoperability, and there is no risk of the bimetal ring pinching the valve disk 9 like a retaining ring. A structure for preventing jamming can be omitted, and the retaining ring does not hit the bimetal ring with the impact force when the valve disk is seated and unseated.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a disc-type steam trap according to an embodiment, FIG. 2 is a plan view of a main part of FIG. 1, and FIG. 3 is a sectional view of a main part of a conventional disc-type steam trap. 1 is the main body, 2 is the lid, 4 is the inlet, 5 is the outlet, 6
1 is an ejection hole, 7 is a discharge hole, 9 is a valve disk, 10 is an inner ring valve seat, 11 is an outer ring valve seat, 12 is a bimetal ring receiving groove, 13 is a bimetal ring, and 14 is a tapered surface.

Claims (1)

[Claims] 1 A variable pressure chamber is formed internally by the main body and the lid, an ejection hole is opened in the center of the end of the main body on the side of the variable pressure chamber to communicate the inlet with the variable pressure chamber, and an annular groove is provided around the outer circumference of the ejection hole to control the ejection. An inner ring valve seat is formed between the hole and the annular groove, an outer ring valve seat is formed around the outer periphery of the annular groove, a discharge hole is opened from the annular groove to communicate the variable pressure chamber with the outlet, and the valve seat is composed of the inner ring valve seat and the outer ring valve seat. In a valve disk that is seated and separated from the valve seat surface is arranged in a variable pressure chamber, an annular bimetallic accommodation groove is provided in the outer ring valve seat, and the outer periphery of the bimetallic accommodation groove is used as a bimetal protection seat means,
The valve disk is formed to a size that allows the inner ring valve seat, the outer ring valve seat, and the bimetal protection seat means to sit apart from each other, a band-shaped bimetal ring with ends is arranged in the bimetal accommodation groove, and a slope wall means is formed in the bimetal accommodation groove. However, this is a disc-type steam trap that prevents the valve disc from seating at low temperatures by expanding/contracting/contracting deformation of the bimetal ring and a slope wall means.