JP3130011B2 - 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 disc-type steam trap for discharging drain and air condensed by steam to the outside of a system, and more particularly to a disc-type steam trap which eliminates heat loss from the trap body and enables efficient operation. About the trap.

[0002]

2. Description of the Related Art Conventionally, a steam trap is attached to a pipeline of a plant that handles steam in order to prevent the flow of steam or steam due to condensation of steam into the pipeline of the plant. Is quickly discharged out of the system. There are various types of steam traps, which can be roughly classified into three types: mechanical type using float, bucket, etc., temperature control type using bimetal, balance pressure, etc., and thermodynamic type. Thus, the present invention is directed to a disc-type steam trap having a thermodynamic operating principle.

[0003] The operation of a disc-type steam trap is largely related to a change in physical properties due to a change in drain pressure. At the time of startup, air and low-temperature drain flow into the trap through an inlet. The disc is pressed against the upper part of the inner wall of the chamber by the drain, and the air and the drain are discharged from the outlet. As the drain temperature gradually increases, part of the drain is converted to flash steam (re-evaporated steam) due to the pressure drop. Since the flash steam has a larger volume than a drain having the same mass, the flow velocity increases as the flash steam increases, and the flash plate flows at a high speed below the disk plate, whereby the disk plate is drawn to the valve seat ring. As the disk plate is drawn, the flash vapor wraps around the top of the chamber (back of the disk plate), applying static pressure to the entire top surface of the disk plate. When the static pressure increases, it exceeds the inlet pressure of the drain inlet port, and the disk plate closes. The flash vapor confined in the chamber is condensed by the heat released from the cap and returns to the drain, so that the pressure in the chamber is reduced, the disk plate is raised at the inlet pressure, and the drain is discharged again.

Although the basic operation of a disc-type steam trap is as described above, there are serious problems in its operation. That is, in the conventional disk-type steam trap, the flash steam trapped in the chamber returns to the drain by heat radiation from the cap, thereby operating the disk plate in the valve opening direction. Opening and closing may be greatly affected by the outside air temperature. For example, when the outside air temperature is high, the time required for the flash steam to return to the drain becomes longer, and the drain discharge may be delayed, causing the drain to accumulate. If the temperature is low, the cooling is too fast, the disk is left open, and the valve is opened with an extremely small amount of drain. For this reason, it was necessary to cover the trap body with a heat insulating cap or the like.

[0005]

SUMMARY OF THE INVENTION According to the present invention, flash steam operated in the valve closing direction by applying a static pressure to a disk plate can be cooled without being affected by the outside air temperature, and thus the influence of the outside air temperature is reduced. It is an object to provide a steam trap that operates without being operated.

[0006]

In order to solve the above-mentioned problems, the present invention employs a method in which a chamber is formed in a trap body, and a disk plate disposed in the chamber is controlled by a pressure of a drain flowing from an inlet. The valve plate is opened apart from the valve seat, and the disk plate is closed with flash steam generated by the re-evaporation of the drain. A chamber inside is defined by a cap to form a space between the outer peripheral surface of the cap and the inner surface of the trap body, the inlet of the drain communicates with the space, and the space is opened and closed by a disk plate. via connected to the chamber, the disc type steam trap which is adapted to cool by a drain existing flash vapor in the chamber in the space Axially opposed positions of the trap body
A pair of trap bodies including an inlet and an outlet for the formed drain
The outer surfaces facing each other are formed in planes
Can be mounted by sandwiching it between piping flanges
And ability base outlet of the drain trap body is formed
And a block extending into the trap body.
One end of the drain inflow path is opened at the center of the inner end face of the lock,
Positioned concentrically with one end of the drain
An annular groove is formed on the end face, and one end is positioned in the groove.
To form three drain outlets at equal intervals,
From the drain to the three drain outlets
To move the disc horizontally,
Attach the cap to the inner end of the chamber inside the cap
And an outer peripheral surface of the cap and an inner surface of the trap body.
Between the cap and the drain inflow path on the outer periphery of the cap.
Connects to the defined space, and connects the drain outlet to the drain outlet
To the disc plate and connect the other end face to the disc plate.
A passage is formed, and the passage is opened and closed by temperature.
A disc-type steam trap characterized by:

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described in detail below. In the figure, (1) is the main body of the steam trap according to the present invention,
(1a) and the lid (1b) are joined together in an airtight state. Opposing outer surfaces (2a) (2) of the base (1a) and the lid (1b)
b) are formed in planes parallel to each other, and are in close contact with the pipe flange (3) as shown in FIGS. 3 and 4 so as to be sandwiched between the pipe flanges (3). A gasket (4) is attached to the outer surface to ensure sealing. Body sandwiched between piping flanges (3)
(1) is fixed by tightening with bolts and nuts bridged between the pipe flanges.

A block (5) extending toward the lid is integrally formed on the base (1a). A cap (7) is formed at the inner end of the block (5) while defining a chamber (7) inside. 6)
Is mounted in a sealed state. Block (5) and cap
A space (8) having a predetermined size is created between the outer peripheral surface of (7) and the inner peripheral surface of the lid (1b). That is, the chamber
(7) is in a state where the outer periphery is surrounded by the space (8) while being partitioned by the cap (6). An entrance (9) is formed at the center of the lid (1b), and the entrance communicates on one side with the drain pipe (11) and on the other side with the space (8). Also base
An outlet (10) is formed in the center of (1a), and a discharge pipe (12)
Is in communication with An axially extending drain inflow passage (13) is drilled in the center of the block (5), and one end of the drain inflow passage is opened into the chamber (7), and the other end is opened through a lateral passage (14). (8). Around the drain inflow path (13), three drain discharge paths (15) are formed on a concentric circle at a predetermined interval from the drain inflow path (13) and are formed at substantially equal intervals in a triangle shape. . On the inner end surface of the block (5), a concave groove (16) is formed in a ring shape on the concentric circle, and one end of the drain discharge path (15) is opened in the concave groove (16). The periphery of the concave groove (16) becomes a valve seat surface.

[0009] (17) is a disk plate, the chamber
It is arranged so that it can move freely within (7). 5 to 7, the disk plate (17) has a structure in which three disks (17a), (17b), and (17c) are stacked, and the upper-layer disk (17a) has a circular center. A hole (18) is drilled. The middle circular plate (17b) is formed with an opening circle (19) having a large diameter from the center to the periphery, and the opening circle (19) communicates with the circular hole (18) and has a dome. It is closed with a bimetal (20). A small hole (21) is formed in the dome-shaped bimetal (20), and communicates with the upper and lower sides of the bimetal. The lower disk (17c) has the opening circle
A through hole (22) is formed in alignment with the center of (19), and an annular groove (23) is formed on the lower surface in alignment with a groove (16) formed in the inner end face of the block (5). Is formed.

[0010] The disk-type steam trap has a structure in which the valve is closed by flowing fluid at a high speed below the disk plate, and is closed when a large amount of air flows in at the time of starting. At this time, the volume of the air trapped in the chamber is small even if the temperature drops, and the valve cannot be opened as it is, and the valve continues to be closed. This is a phenomenon called air obstruction. In the disk plate of the present invention, the air trapped in the chamber enters the opening circle (19) from the circular hole (18) at the center of the disk plate as shown in FIG. , Through the small hole (21) of the dome-shaped bimetal (20), to the through hole (22), and to be discharged from the outlet (10), and the disk plate has an action as an air vent Therefore, air at the time of starting can be discharged. When the valve is opened and the temperature rises, the dome-shaped bimetal (20) deviates downward as shown in FIG. 7 and closes the through hole (22), so that it operates in the same manner as a disc plate of a normal steam trap. . Chamber
At the center of the upper inner wall of the cap (6) defining (7), a projection (24) projecting inward is formed, and the disk plate (17) is attached to the cap (6) by the upper inner wall. It does not adhere. This allows the flash steam to wrap around the back of the disk plate (7).

At the time of startup, air and drain flow from the drain pipe (11) into the space (8) from the inlet (9) and push up the disk plate (17) from the drain inflow path (13) through the lateral passage (14). While entering the chamber (7), it is discharged from the outlet (10) through the drain discharge path (15). As the drain flows, the drain temperature gradually rises, and part of the drain is turned into flash steam due to the pressure drop. Since the flash steam has a larger volume than the drain having the same mass, the flow velocity increases with the increase of the flash steam, flows at a high speed below the disk plate (17), and moves the disk plate (17) to the inner end face of the block (5). Pull towards. When the disk plate (17) is pulled, the flash vapor is transferred to the upper part of the chamber (7) (back of the disk plate).
To apply static pressure to the entire upper surface of the disk plate (17). When the static pressure exceeds the drain pressure at the inlet, the disk plate (17) comes into close contact with the valve seat and closes. The flash steam trapped in the chamber (7) by closing the valve
The pressure in the chamber (7) increases rapidly because it is cooled by the drain existing in the space (8) between the outer peripheral surface of (6) and the inner peripheral surface of the lid (1b), condensed and returns to drain. To decline.
As a result, the disk plate (17) is lifted by the inlet pressure, and the drain starts to be discharged again. In this way, the steam trap of the present invention closes the valve by the flash steam re-evaporated from the drain, and thus operates accurately without leaking live steam.

In the steam trap according to the present invention, the flash steam trapped in the chamber when the disk plate is closed is subjected to a drain existing in a space between the outer peripheral surface of the cap defining the chamber and the inner surface of the trap body. Because the steam is cooled by the flash steam, the operation of the steam trap, that is, the operation of the steam trap can be performed without being affected by the outside air temperature, and since the valve can be closed only by the flash steam, live steam may leak. Disappears. In addition, the trap can be operated without being affected by the outside air temperature. As a result, the trap body can be made to have a heat insulating structure, or the heat loss from the trap body can be reduced to zero theoretically by using a heat insulating material. In addition, it is possible to prevent an increase in steam loss due to heat radiation loss. Thus, in the steam trap of the present invention, the steam loss can be substantially reduced to the amount of live steam leakage, and the steam loss due to heat radiation loss can be suppressed to a substantially negligible level. According to calculations, the cost of producing steam is 2.5.
In a certain refinery, 20,000 steam traps are used. If it is assumed that a steam loss of 1 kg / hr is generated per trap, the total oil refinery has a capacity of 5 kg / hr. This means that a loss of 10,000 yen / Kg / hr has occurred, resulting in a loss of about 400 million yen or more in one year. In the steam trap of the present invention,
As a result of the heat dissipation loss being reduced to a negligible extent, assuming that the conventional heat dissipation loss accounts for half, it is possible to expect a saving of 200 million yen or more in at least one year.

Further, since the drain discharge path (15) is formed at three places in a triangle shape, the drain is uniformly discharged from each drain discharge path (15). As a result, the disc plate (17)
Always moves horizontally and is evenly drawn to the valve seat, thus closing the valve reliably. FIG. 8 shows a conventional steam trap.
As shown in (1), since there is only a single drain discharge path and the drain is discharged in only one direction, the disk plate moves in an inclined state, which causes the disk plate to be partially cut off and entrains steam when the valve is closed Could close the valve, and live steam could leak.

[0014]

According to the present invention, the axial direction of the trap body is
Tiger including the inlet and outlet of the drain formed at the opposite position
The opposing outer surfaces of the main body are formed in planes parallel to each other.
Between the pipe flanges while making contact with the pipe flange surface
And the trap outlet is shaped like a drain.
A block that extends into the trap body on the base that is formed
Form one end of the drain inflow path at the center of the inner end face of the block
And located concentrically with one end of the drain inflow path
An annular groove is formed in the inner end surface of the block , and one groove is formed in the groove .
Three drain outflow paths are formed at equal intervals with the ends positioned,
Drain flowing from the drain inflow channel to the three drain outflow channels
Make the disk board move horizontally with equal flow
And attach the cap to the inner end of the block
A chamber is defined in the outer peripheral surface of the cap and a trap.
Form a space between the inner surface of the main body and the drain
To the space defined on the outer periphery of the
Connect to the drain outlet and make sure that the disk
From the other end face, and the passage is formed depending on the temperature.
It is opened and closed, so the whole
The flash steam trapped in the chamber when the disk plate is closed is cooled by the drain existing in the space between the outer peripheral surface of the cap and the inner surface of the trap body that defines the chamber. The cooling of the flash steam, that is, the operation of the steam trap can be performed without being affected by the outside air temperature, so that an extremely accurate operation can be obtained and the valve is closed only by the flash steam. Therefore, there is an effect that there is no possibility of leakage of live steam. In addition, the trap can be operated without being affected by the outside air temperature. As a result, the trap body can be made to have a heat insulating structure or made of a heat insulating material, so that heat loss from the trap body can be reduced to zero theoretically. Therefore, generation of steam loss due to heat radiation loss can be significantly reduced, and an extremely efficient steam trap can be provided.

An annular concave groove formed on the inner end face of the block.
One end of the drain discharge path is open inside the
The edge is used as a valve seat surface to enhance the seating of the disc plate,
This makes it possible to achieve a cooling effect. Furthermore, the disk
The passage that opens and closes at the temperature formed in the plate,
Generation can be prevented.

[Brief description of the drawings]

FIG. 1 is a sectional view of a steam trap according to the present invention.

FIG. 2 is a perspective view taken along the line 1A-A 'of FIG.

FIG. 3 is a sectional view showing a valve-open state;

FIG. 4 is a sectional view showing a valve closed state.

FIG. 5 is a perspective view in which a part of a disk plate is sectioned.

FIG. 6 is a cross-sectional view of the disk plate showing a state when air is discharged.

FIG. 7 is a cross-sectional view of the disk plate showing a state after air is discharged.

FIG. 8 is a sectional view showing the operation of a conventional steam trap and a disk plate.

[Explanation of symbols]

 (1) Main body (1a) Base (1b) Lid (2) Outer surface (3) Piping flange (4) Gasket (5) Block (6) Cap (7) Chamber (8) Space (9) Inlet (10) Outlet (11) Drain pipe (12) Drain pipe (13) Drain inflow path (14) Lateral passage (15) Drain discharge path (16) Groove (17) Disk plate (17a) Upper disk (17b) Middle disk ( 17c) Lower disk (18) Circular hole (19) Open circle (20) Domed bimetal (21) Small hole (22) Through hole (23) Annular groove (24) Projection

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-B-51-9168 (JP, B2) JP-B-49-36517 (JP, Y1) JP-B-37-13672 (JP, Y1) (58) Field (Int.Cl. ⁷ , DB name) F16T 1/16

Claims (1)

(57) [Claims] 1. A chamber is formed in a trap main body, and a disc plate disposed in the chamber is separated from a valve seat by a pressure of a drain flowing from an inlet to open the valve.
The disc plate is closed by the flash steam generated by the re-evaporation of the drain, the inlet and the outlet of the drain are formed at the axially opposed positions of the trap body, and the chamber in the trap body is defined by the cap. A space is formed between the outer peripheral surface and the inner surface of the trap body, the inlet of the drain communicates with the space, and the space is connected to the chamber through a drain inflow passage opened and closed by a disk plate. disc type steam trap odor which is adapted to the flash vapor cools by a drain present in the space
And the drain formed at the axially opposed position of the trap body
Opposing outer surfaces of the trap body, including the inlet and outlet
To make a plane parallel to
Between the two piping flanges and can be mounted.
Trap body on base where drain of body is formed
Forming a block extending into the inner end surface of the block.
Open one end of the drain inflow passage to the center, and
An annular groove on the inner end face of the block located concentrically with the end
And one end is positioned in the groove, and three drain flows are formed.
Outlets are formed at equal intervals, and three drains are
Equalize the flow of drain flowing through the outflow channel
Move it horizontally, and attach the cap to the inner end of the block.
Attach the cap to define a chamber in the cap, and
Form a space between the outer surface of the trap and the inner surface of the trap body
The drain inflow path into the space defined on the outer periphery of the cap.
Connect the drain outlet to the drain outlet
In addition, a passage connecting one end face to the other end face is formed on the disc plate.
And the passage is opened and closed by temperature.
Disc type steam trap.