JPH0467079B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a structure for eliminating steam locking in a steam trap that automatically drains only condensate without allowing steam to escape from a steam piping system.

A steam trap automatically discharges condensate generated in steam piping and equipment that uses steam.
If steam remains in front of the trap, so-called steam locking occurs, in which the valve cannot be opened even though condensate is generated in the piping system and equipment used.

Steam locking is likely to occur when condensate is discharged from a cylinder dryer or when the piping on the inlet side of a steam trap is upright.

For example, when discharging condensate from a cylinder dryer, the condensate is led out from the condensate pool in the cylinder using a siphon pipe, and then discharged using a steam trap attached to the end of the siphon pipe. Since the siphon pipe passes through the steam supply path, the condensate is heated and re-evaporated there. Also, after the condensate is discharged, the siphon pipe is filled with steam, so that the condensate accumulates in the cylinder. However, due to this steam, the trap remains closed and condensate cannot be discharged.

BACKGROUND ART A technique for eliminating steam locking in a conventional steam trap is disclosed in Japanese Utility Model Publication No. 50-31960. This is designed to allow a very small amount of steam to escape from an exhaust valve installed in the steam trap at all times, thereby allowing steam in front of the steam trap to escape, allowing condensate to flow into the trap and being discharged.

Problems to be Solved by the Present Invention The above-mentioned conventional technology constantly releases steam even in a very small amount, so it is uneconomical due to steam loss.

The technical problem of the present invention is to make it possible to eliminate steam locking without steam leakage.

Means for Solving the Problems The technical means of the present invention taken to solve the above-mentioned technical problems is to form a steam supply passage in the upper part of the casing to supply steam to steam-using equipment; an ejector, a water reservoir chamber extending downward from the opening of the jet flow portion of the ejector, an annular partition provided above the water reservoir chamber, and an annular partition between the partition wall and the valve casing outside the water reservoir chamber; forming a space, the upper part of the annular space is connected to the inlet of the fluid from the steam-using equipment, the lower part is connected to the water sump chamber, and the water sump chamber is connected to the opening of the jet flow section through a hole inside the partition; A turning deflector is placed in an annular space, and a valve is provided to discharge water accumulated in a water storage chamber.

Effect The operation of the above technical means is as follows.

Steam is supplied to steam-using equipment via an ejector formed in the steam supply passage. Fluid from the steam-using equipment enters the annular space through the inlet and is drawn into the jet flow section of the ejector through holes inside the bulkhead. When the fluid passes through this annular space, it is swirled by the deflector. Centrifugal force acts on the swirling fluid, and condensate has a larger mass than steam, so it is blown out of the swirling flow, hits the surrounding wall of the water storage chamber, flows down along the wall, and is discharged from the system by the drain valve. be done. The steam is drawn into the jet flow section of the ejector through the holes inside the partition and is again supplied to the steam-using equipment. Therefore, steam does not remain in front of the steam trap, and condensate can be quickly discharged.

Effect of the invention The present invention produces the following unique effects.

Since condensate can be discharged without leaking steam, it saves energy, and since the condensate is sucked in by an ejector, it can be discharged quickly, improving the productivity of steam-using equipment.

Since the turning deflector is a small annular part,
Can be installed in narrow annular spaces. Furthermore, since the swirling deflector has good separation efficiency, condensate water does not flow back into the steam-using equipment.

Embodiment An embodiment illustrating a specific example of the above technical means will be described (see FIG. 1).

The casing consists of an upper body 3 forming a steam supply passage 1 and an inlet 2, a lower body 5 forming a water storage chamber 4, and a bottom cover 6.

A steam inlet 7 and a steam outlet 8 are formed at both ends of the steam supply passage 1. A nozzle member 9 is disposed in the steam supply passage 1, and a jet flow portion 10 is formed around the nozzle member 9. A throat section 11 and a diffuser section 12 are formed on the peripheral wall of the steam supply passage 1. The nozzle member 9, the jet flow section 10, the throat section 11, and the diffuser section 12 constitute an ejector. Reference numeral 13 is an opening to the jet flow section 10.
A check valve consisting of a spring 14, a disk-shaped valve body 15, and a valve seat 16 is arranged below the opening 10.

A double cylindrical partition wall 1 in the space below the valve seat 16
7 and a tapered screen 18 are arranged. An annular space 19 is formed between the partition walls 17, and the annular space 1
The inlet 2 is connected to the upper part of the inlet 9. A turning deflector 20 is arranged in the annular space 19. The deflector 20 is formed from a plurality of downwardly inclined walls.

A float 21 and a float cover 22 covering it are arranged in a water reservoir chamber 4. The float 21 is a hollow ball made of a thin metal plate. The float cover 22 has an inverted cup shape, and its legs 23 are fixed to the bottom cover 6 with bolts 24. A ventilation hole 25 is opened in the upper part of the float cover 22. The vent holes 25 are provided to allow condensate to flow into the float cover from the lower part and to vent steam from the upper part. A drain valve seat 26 is attached to the bottom cover 6 so that a float 21 can sit on and off to discharge condensate accumulated in a water storage chamber.

[Brief explanation of the drawing]

FIG. 1 is a piping diagram of a structure for eliminating steam locking of a steam trap according to an embodiment of the present invention. 1: Steam supply passage, 2: Inlet, 4: Water reservoir chamber, 9: Nozzle member, 12: Diffuser section, 1
7: bulkhead, 19: annular space, 20: turning deflector, 21: float, 26: drain valve seat.

Claims (1)

[Claims] 1. A steam supply passage is formed in the upper part of the casing to supply steam to steam-using equipment, an ejector is formed in the steam supply passage, a water reservoir chamber is formed extending downward from the opening of the jet flow part of the ejector, and a water reservoir is formed. An annular partition is provided in the upper part of the chamber to form an annular space between the partition and the valve casing outside the partition, and the upper part of the annular space is an inlet for fluid from the steam-using equipment.
The lower part is connected to the water reservoir chamber, the water reservoir chamber is connected to the opening of the jet flow section through a hole inside the partition wall, a swirling deflector is arranged in the annular space, and a valve is provided for discharging water accumulated in the water reservoir chamber. In addition, the steam trap has a structure that eliminates steam locking.