JPS6337600Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a thermal steam trap with an automatic forced opening valve, and in particular to a new system that automatically and smoothly eliminates unexpected operational troubles in thermal type steam traps. This document discloses an improvement proposal regarding built-in functions.

Thermal type steam trap (hereinafter simply TD)
When steam equipment is restarted after a suspension of operation, the so-called disk member generally maintains its seated position on the valve seat surface, which consists of an inner and outer ring-shaped seat, during the initial stage of ventilation. Sometimes, air or non-condensable fluids such as low-temperature condensate accumulate undesirably in the variable pressure chamber behind the disk member, blocking the upward movement of the inflow condensate against the disk member.
There is a risk of causing an operational problem called locking.

Therefore, attempts have been made to forcibly unseating the disk member in the non-operating low temperature range of the TD trap by using a tapered guide that generates a thrust force in the annular bimetal piece when its diameter changes depending on temperature changes. , the annular bimetallic piece has a strong frictional force acting on it with the taper guide that converts diameter fluctuations into thrust, so it tends to pull, making it difficult to expect smooth and stable operation, and it also has poor durability. There was a problem.

To deal with this, the disk member that sits on and leaves the outer and outer ring seats has an outer diameter that slightly protrudes from the periphery of the outer ring seat, and the lower surface of this protrusion is oriented so that it contacts the disk member. A bimetallic piece interposed between a spring-biased annular or cylindrical unseating force member and a cap member that resists the spring bias against the unseating force member and defines a variable pressure chamber behind the disk member. The above-mentioned difficulty could be solved by providing a restraining member that can be rolled down under high temperature conditions (see Japanese Patent Application No. 57-62908), but when the size of this bimetal piece is incompatible with the cap member, An example of this is as shown in Figures 1a and 1b, where the bimetallic piece moves inadvertently, depending on the mounting orientation of the trap, and may interfere with the operation of the forced valve opening.

This invention consists of an inner ring seat s ₁ that terminates an inflow hole i, an outer ring seat s ₂ that separates an annular groove g around it, and an outflow hole o that opens at the bottom of the annular groove g. ₁ , _s2 , and a cap member m that partitions and forms a variable pressure chamber v behind this disk member d, with the disk member d protruding from the periphery of the outer ring seat _s2. combined as having an outer diameter located at
An annular or cylindrical unseating force member 6 biased by a spring 5 in a direction to contact the disk member d at the protruding lower surface, and a cap member m An automatic valve-opening system comprising a restraining member 8 that is pressed down under high temperature conditions by a bimetallic piece 7 interposed between the valve and the restraining member 8, and pins 11 and 11' for holding the bimetallic piece 7 concentrically on the restraining member 8. It is a type thermal steam trap.

This idea is based on frictional resistance by utilizing the direct balance between the spring bias acting on the separation force member against the disk member and the expansion force of the bimetal piece acting on the restraining member against this bias. This fundamentally eliminates unsmooth movement and is not affected by the trap's mounting orientation.

Figures 1a and b show the large-sized model that gave rise to this idea.
The diagram illustrates the differences in the installation posture of the TD trap. In the figure, 1 is the inlet, 2 is the outlet, 3 is the strainer, and 4
is a sheet member, which enters as shown in figure a and enters body b with exits 1 and 2 opened to the left and right, for example;
The sheet members 4 are assembled via the gasket p.

The sheet member 4 has an inner ring seat s ₁ terminating the inflow hole i opening facing the outside of the strainer 3, and an outer ring seat s ₂ surrounding the inner ring seat s 1 which separates an annular groove g on the upper surface.
An outflow hole o is opened at the bottom of the annular groove g.

This seat member 4 includes a disk member d which rests commonly on both the inner and outer wheel seats s ₁ and s ₂ to take off and take off seats, and a cap member m which partitions and forms a variable pressure chamber v behind the disk member d, as shown in the figure. The combined cap member m is screwed and fixed to the body b so that the outer diameter of the member d slightly protrudes from the periphery of the outer race seat _s2 .

Note that c in the figure is the bonnet cover.

The above is based on the configuration of the main parts of a general TD trap, but in particular, in this example, the unseating forcing member 6 is biased by the coil spring 5 in the direction of contacting the disc member d and its protruding lower surface. and a restraining member 8 which presses down the unseating force member 6 under high temperature by a bimetal piece 7 interposed between it and the cap member m against the spring bias against the force member 6, is installed in the cap member m in advance. Note 9
is a through hole bored in the center of the end wall of the disc-shaped restraining member 8 in this example.

When the steam equipment is out of operation, the disk member d is biased by the coil spring 5 and the unseating forcing member 6
Therefore, when the air supply is restarted, the air in the pipe system that passes through the drain pipe from the terminal of the steam equipment and reaches the inlet ₁ , and the subsequent low-temperature condensate flows _through the inlet hole. It is clear that the fluid passes through the outflow hole o from i and is discharged to the outlet 2. As the low temperature fluid is discharged, the temperature gradually rises and condensate begins to flow in, thereby causing the bimetallic piece to 7
begins to heat up.

The bimetal piece 7 may be, for example, a pair of bimetal disks stacked with the low expansion side facing each other and the high expansion side facing each other back to back. The unseating forcing member 6 is pressed down against the bias of the spring 5, and thus the forced unseating restraint on the disk member d is released.

After the restraint is released, controlled drainage by so-called thermodynamic operation, which depends on the temperature of the condensate flowing between the inflow hole I and the outflow hole O, is carried out as well known. During this time, the above-mentioned restraint by the spring-biased bimetal piece 7 continues to be released, so that the disk member d
The operation of the steam equipment is not restricted in any way during operation of the steam equipment.

On the other hand, when the operation of the steam equipment is stopped or finished, the temperature of the condensate arriving at the inlet 1 decreases, and the expansion displacement of the bimetal piece 7 is restored, so that the disk member d is again biased by the spring acting on the unseating forcing member 6. Therefore, since the inflow hole i and the outflow hole o are forcibly opened, operational troubles due to accumulation of non-condensable fluid between the variable pressure chambers v do not occur.

The unseating forcing member 6, which is illustrated as having a cylindrical shape in FIGS. 1a and b, may also have an annular shape as shown by 6' in FIG. 8 is also modified to have a lodging cup shape as shown in 8'. Note that the annular unseating forcing member 6' may have a guide extension that fits loosely into the inner diameter of the coil spring 5.

In any case, the inner diameter of the cap member m depends on the outer diameter of the disk member d, that is, it depends on the drainage capacity of the trap, and it is not a good idea to change the size of the disc-shaped bimetal 7, so it is not suitable for large traps. Therefore, an attempt was made to deal with this by providing a disc bimetal accommodating recess 10 on the top wall of the cap member m. However, in this case, the disc-shaped bimetal 7 may shift and protrude from the accommodation recess 10 in the mounting position shown in FIG. 1b.

This drawback is caused by the suppression member 8 as shown in Fig. 2a and b.
This problem could be easily solved by holding the bimetal piece concentrically with respect to the restraining member 8 by loosely fitting the pins 11 and 11' into the through hole 9 of the bimetal piece 7 into the center hole of the bimetal piece 7. In the case of Fig. 2b, pin 11'
The insertion end is enlarged to be slidable within the counterbore 9' of the through hole 9 to prevent it from coming off.

As is clear from the above description of two specific examples that are advantageously adapted to the implementation of this invention, this invention uses a spring that forces the disk member to be forcibly separated, regardless of the installation orientation of the trap. When the trap temperature is lower than its operating temperature, it is possible to reliably guide the forced separation of the disk member without the mediation of any frictional force, simply by balancing the load due to thermal deformation of the bimetallic piece resisting the deflection. , you can always expect smooth operation without any sticking or catching during the movement of the disc valve.

Thus, according to this invention, regardless of the mounting orientation of the thermal steam trap, operational troubles due to locking of the disk member can be reliably and smoothly prevented, and the instability of conventional prevention means can be eliminated.

[Brief explanation of the drawing]

Figures 1a and b are cross-sectional views showing the difference in the mounting posture of the large TD trap and the resulting bimetal movement; Figure 1c is a cross-sectional view of the main part showing a modification of the unseating force member and the restraining member; Figure 2 Figures a and b are sectional views of essential parts of an embodiment of this invention, showing the left half and right half separately for each active and non-active position of forced unseating. i...Inflow hole, q...Outflow hole, s ₁ ...Inner ring seat,
s ₂ ... Outer ring seat, g... Annular groove, d... Disc member, v... Transformation chamber, m... Cap member, 4...
Sheet member, 6, 6', 6'', 6... Seating forcing member, 7, 7... Bimetal piece, 8... Suppressing member,
11, 11'...pin.

Claims (1)

[Scope of utility model registration request] A seat member 4 has an inner ring seat s ₁ that terminates the inflow hole _i , an outer ring seat s ₂ that separates the annular groove g around it, and an outflow hole σ that opens at the bottom of the annular groove g. A disk member d that commonly rests on the outer ring seat _s2 for seating and taking off, and a cap member m that partitions and forms a variable pressure chamber v behind the disk member d, are arranged such that the disk member d protrudes from the periphery of the outer ring seat _s2 . The spring 5 is assembled as having an outer diameter, and the spring 5 is oriented so that it contacts the disk member d at the protruding lower surface.
an annular or cylindrical unseating forcing member 6 biased by;
A restraining member 8 which resists the bias of the spring 5 against the unseating forcing member 6 and is pressed down under high temperature conditions by a bimetallic piece 7 interposed between it and the cap member m; An automatic forced-opening type thermal steam trap comprising pins 11 and 11' that hold 7 concentrically.