JP7249143B2 - Disk type steam trap and disk type valve body used for steam trap - Google Patents

Description

The disc-type steam trap and the disc-type valve body used in the steam trap according to the present application relate to a technique of configuring a disc-type valve body that is floatably positioned in a steam trap valve chamber and opens and closes the valve.

2. Description of the Related Art An industrial plant is sometimes installed with a piping system for transferring steam or the like generated by a boiler to a supply destination at high temperature and high pressure. In the initial stage of transferring steam in this piping system, it is necessary to transfer the steam while discharging the air in the piping to the outside in order to transfer the steam smoothly. Further, in the process of continuously transferring the steam, the steam is liquefied and drain (condensed water of the steam) is generated. If this drain stays in the piping, it becomes an obstacle to steam transfer, so it is necessary to discharge the drain to the outside as appropriate.

A disk-type steam trap is provided in the piping system in order to discharge such air and drain. A disk-type steam trap incorporates a disk-shaped disk valve in a valve chamber, and this disk valve is arranged to float freely. Normally, the disc valve is closed by blocking a valve seat provided on the flow path in the disc type steam trap to prevent steam leakage.

At the initial stage of vapor transfer, the bimetallic ring that expands and contracts according to the temperature pushes up the disc valve, creating a small gap between the disc valve and the valve seat. is discharged, and the vapor transfer in the initial stage is smoothly performed. Condensate is generated as the steam is transferred, and when the disk-type steam trap is filled with condensate, the hydraulic pressure pushes up the disk valve, which opens the flow path and discharges the condensate.

After the condensate is discharged, the hot condensate continues to flow into the disk-type steam trap along the same flow path. The inflow of this high-temperature drain expands the bimetallic ring to release the interference with the disc valve. Then, the high-temperature steam that subsequently flows in flows at high speed under the disk valve, forming a low-pressure area on the lower surface of the disk valve, drawing the disk valve toward the outlet, and along with this, the upper surface of the disk valve. The disk valve is pushed down toward the discharge port by the high pressure of the steam that has flowed into the valve, and the valve closes.

Thus, the disc valve closes and blocks the valve seat of the flow path, preventing steam leakage. After that, condensate is generated as the steam is transferred, and when this condensate flows into the valve chamber, the steam that has flowed around to the upper surface of the disc valve is cooled, the pressure drops, and the disc valve opens to drain the drain. Discharge.

As such a disk-type steam trap, there is a technique as disclosed in Patent Document 1 described later. In the disk-type steam trap disclosed in this patent document 1, when the disk plate 17 is closed, the flash steam confined in the chamber 7 is released from the outer peripheral surface of the cap 6 defining the chamber 7 and the trap body. It is configured to be cooled by a drain present in the space 8 with the inner surface. Therefore, the cooling of the flash steam, that is, the operation of the steam trap is performed without being affected by the outside air temperature.

The block 5 functioning as a valve seat is formed with three triangular drain discharge passages 15 . As a result, the disk plate 17 moves horizontally and is drawn evenly to the block 5, which is the valve seat.

JP-A-2000-240892

However, in the technique disclosed in the above-mentioned Patent Document 1, the disk plate may not float properly, which may cause malfunction of the disk-type steam trap. In other words, the disc steam trap is designed so that the gap between the inner wall of the valve chamber and the side surface of the disc valve is small in order to ensure reliable operation.

For this reason, if the posture of the disc plate that floats up and down deviates from the horizontal position in an oblique direction, it may catch on the inner wall of the valve chamber and become unable to float. In particular, if the disc plate is caught while it is raised, the valve cannot be closed and steam leaks, impairing proper operation of the disc steam trap.

In the technique disclosed in Patent Document 1 as well, since the gap between the inner wall of the cap 6 and the side surface of the disk plate 17 is small, when the disk plate 17 floats, the posture of the disk plate 17 is tilted from the horizontal position. There is a danger that the inner wall of the cap 6 will slip and get caught.

As described above, in the technique disclosed in Patent Document 1, the block 5 is provided with three triangular drain discharge passages 15 so that the disk plate 17 floats horizontally. However, since the opening and closing of the valve due to the upward or downward movement of the disc plate 17 are frequently repeated, the posture of the disc plate 17 deviates obliquely from the horizontal position, and there is a danger of being caught on the inner wall of the cap 6. inability to fully avoid sexuality.

Therefore, the disk-type steam trap and the disk-type valve body used in the steam trap according to the present application are intended to solve these problems, and by ensuring proper floating of the disk valve, the malfunction of the steam trap is ensured. To provide a disk-type steam trap and a disk-type valve body used for the steam trap, which can prevent the occurrence of erosion.

The disk type steam trap according to the present application is
A main body having therein a flow path through which a fluid passes and a valve chamber communicating with the flow path,
A disk-type valve body positioned floatably in the valve chamber, closing the flow path when in the closed state and opening the flow path when in the open state;
In a disc steam trap with
A sliding part provided on the side of the disk-type valve body located along a plane parallel to the floating direction of the disk-type valve body, and sliding on the inner wall of the valve chamber when the disk-type valve body floats Sliding portion slidable against,
characterized by comprising

Further, the disk-type valve body used for the steam trap according to the present application is
It is positioned floatably in a valve chamber formed inside the main body of the steam trap, closes the flow path communicating with the valve chamber when in the closed state, and opens the flow path when in the open state. In the disk type valve body used for the steam trap that opens,
a slide provided on the side along a plane parallel to the direction of floating, the slide being slidable against the inner wall of the valve chamber when floating;
characterized by comprising

In the disk-type steam trap and the disk-type valve body used in the steam trap according to the present application, the sliding portion provided on the side portion located along the plane parallel to the floating direction of the disk-type valve body, The disk type valve body is provided with a sliding portion that can slide against the inner wall of the valve chamber when the type valve body floats.

Therefore, when the disk-shaped valve body floats, even if the posture of the disk-shaped valve body deviates obliquely from the horizontal position, the disk-shaped valve body can float smoothly due to the sliding of the sliding portion. can do. Therefore, by ensuring proper floating of the disk-type valve body, malfunction of the steam trap can be reliably prevented.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partial cross-sectional view showing a disc-type steam trap 1 that is a first embodiment of a disc-type steam trap and a disc-type valve element used in the steam trap according to the present application. 2 is an enlarged cross-sectional view of the disk valve 2 shown in FIG. 1 near a sliding ball 3a. FIG. FIG. 2 is a plan view of the disk valve 2 shown in FIG. 1;

[Explanation of terms in the embodiment]
The main terms shown in the following embodiments correspond to the following constituent elements of the disk-type steam trap and the disk-type valve body used in the steam trap according to the present application, respectively.
Disc valve 2: Disc type valve body Sliding balls 3a, 3b, 3c: Sliding part Variable pressure chamber 7, etc.: Valve chamber Body 11 and lid 12: Body Contact surface 11a: Valve chamber Inner wall Body inflow passage 31, valve seat inflow passage 32, valve seat discharge passage 33, inflow port 51 and discharge port 52 Flow path Arrow 95 direction Floating direction Air, drain or steam Fluid

[First Embodiment]
1st Embodiment of the disk-type steam trap which concerns on this application, and the disk-type valve body used for a steam trap is described based on drawing. FIG. 1 is a partial cross-sectional view of a disk-type steam trap 1 according to this embodiment, FIG. 2 is an enlarged cross-sectional view of the vicinity of a sliding ball 3a of a disk valve 2, and FIG.

(Description of the configuration of the disk type steam trap 1)
Steam generated by a boiler is transferred to a supply destination in a main pipe (not shown) of a piping system arranged in an industrial plant. Since air exists in the piping at the stage of starting vapor transfer, it is necessary to quickly discharge this air at the beginning of vapor transfer. Also, in the process of transferring the vapor, the vapor is liquefied and drain is generated. This drain also needs to be discharged from the piping system as appropriate.

In order to properly discharge the air at the beginning of the steam transfer and the drain generated as the steam transfer progresses, branch pipes are connected throughout the main pipe of the piping system. Disk type steam trap 1 is connected.

As shown in FIG. 1, a lid 12 is screwed into a recessed portion formed in the upper portion of a body 11 of the disk-type steam trap 1, and attached in an airtight manner. The area surrounded by the recessed portion of the body 11 and the internal space of the lid 12 is the valve chamber. A cap 13 is further attached to the top of the lid 12 . The cap 13 forms a cap space 13S with the outer surface of the lid 12, and is attached while keeping the cap space 13S airtight.

An inflow port 51 is formed in one side of the body 11, and a branch pipe 81 is connected to this port, and steam and drain flow in from the inflow port 51. A discharge port 52 is formed on the other side of the body 11, and a discharge pipe 82 is connected to the discharge port 52, through which drainage is discharged.

The body 11 is provided with a screen 25 for removing foreign matter such as rust and scale, and the steam and drain that have flowed in from the inlet 51 pass through this screen 25 . A body inflow passage 31 communicating with the inflow port 51 is formed in the body 11 .

A valve seat 15 is provided in a valve chamber surrounded by the recessed portion of the body 11 and the internal space of the lid 12 . A valve seat inflow passage 32 is formed in the valve seat 15 . The valve seat inflow passage 32 communicates with the body inflow passage 31 and opens toward the valve chamber above the valve seat 15 . Further, the valve seat 15 is formed with a valve seat discharge passage 33 that allows the valve chamber and the discharge port 52 to communicate with each other.

A disk valve 2 is arranged above the valve seat 15 . This disc valve 2 is positioned so as to be able to float in the direction of arrow 95 within the valve chamber. A valve chamber above the disk valve 2 is configured as a variable pressure chamber 7 .

The disk valve 2 has a substantially disk shape, and three sliding balls 3a, 3b, and 3c are provided on the side surface positioned along the plane parallel to the arrow 95 direction, which is the floating direction. Each of the sliding balls 3a, 3b, and 3c has a spherical shape, and as shown in FIG. 1 shows a cross section II of the disk valve 2 shown in FIG.

As shown in FIG. 2, the sliding ball 3a is rotatably held in a holding space 5a of a ball holding portion 4a formed on the side surface of the disk valve 2. As shown in FIG. The holding space 5a is open outward, and the diameter of this opening is slightly smaller than the diameter of the sliding ball 3a. Therefore, the slide ball 3a can partially protrude from the side surface of the disc valve 2 to the outside. An elastic member (for example, a spring or rubber, not shown) may be accommodated in the holding space 5a to constantly urge the sliding ball 3a outward.

The sliding ball 3a protruding from the side surface of the disk valve 2 is in contact with the inner wall of the valve chamber, that is, the contact surface 11a of the main body 11, and rotates and slides as the disk valve 2 floats in the direction of the arrow 95. do.

Sliding balls 3b and 3c also have the same configuration as sliding ball 3a shown in FIG. and protrudes from the side of the disk valve 2. Like the sliding ball 3a, the sliding balls 3b and 3c also contact the contact surface 11a of the main body 11, and rotate and slide as the disk valve 2 floats in the arrow 95 direction.

A slope 15a is formed on the outer periphery of the valve seat 15, and a bimetallic ring 22 is mounted so as to cover the slope 15a. This bimetallic ring 22 has a C-shape obtained by cutting out a part of the annular member, and the diameter length of the ring expands and contracts depending on the ambient temperature. That is, when the ambient temperature exceeds a predetermined temperature, the ring diameter length of the bimetallic ring 22 expands and expands, and when the ambient temperature falls below the predetermined temperature, the ring diameter length of the bimetallic ring 22 increases. shrinks and contracts. A ring 21 is arranged above the bimetallic ring 22 so as to be able to come into contact with the lower surface of the disk valve 2, and the bimetallic ring 22 supports the ring 21 from below.

(Explanation of operation of disk type steam trap 1)
Next, the operation of the disk-type steam trap 1 will be explained. At the initial stage when steam is not flowing, the temperature of the disk-type steam trap 1 is low, so the bimetallic ring 22 is contracted, slides upward along the slope 15a of the valve seat 15, and displaces the ring 21. pushes disk valve 2 through. FIG. 1 shows this state, in which a slight gap is created between the upper surface of the valve seat 15 and the disc valve 2 (open state).

At the initial stage of steam transfer, air exists in the piping, but as the steam is transferred, this air is pushed out, passes through the gap between the upper surface of the valve seat 15 and the disk valve 2, and advances in the direction of the arrow 92 to be exhausted. It is discharged from outlet 52 into discharge pipe 82 .

After the air is discharged in the initial stage, low-temperature drain flows into the disc steam trap 1 from the inlet 51 along the arrow 91 direction. The hydraulic pressure of the drain pushes the disk valve 2 up from the upper surface of the valve seat 15 to open it completely (open state, not shown), and the drain is discharged from the discharge port 52 along the direction of the arrow 92. .

After that, high-temperature drain flows into the disk-type steam trap 1 along the arrow 91 direction. The high-temperature drain raises the temperature of the disk-type steam trap 1, and the bimetallic ring 22 expands, slides downward along the slope 15a of the valve seat 15, and sinks. As a result, the ring 21 supported by the bimetallic ring 22 also moves downward, and the interference with the disc valve 2 is released. At this point, the disk valve 2 is pushed up by the passage of high-temperature drain and remains open.

After the high-temperature drain is discharged, high-temperature steam continues to flow into the disk-type steam trap 1 along the direction of the arrow 91, and this steam passes through the lower surface of the disk valve 2 at high speed and is discharged. At this time, the jet flow of steam flowing at high speed on the lower surface of the disk valve 2 produces a low-pressure region according to Bernoulli's theorem, which draws the disk valve 2 to the valve seat 15 . At the same time, the steam flows from the side surface of the disk valve 2 into the variable pressure chamber 7 formed on the upper surface of the disk valve 2, and the pressure in the variable pressure chamber 7 is increased by recompression of the steam.

Due to the lower pressure in the lower part of the disc valve 2 and the higher pressure in the upper part, the disc valve 2 descends and closes in close contact with the upper surface of the valve seat 15 (closed state). By maintaining the high pressure in the variable pressure chamber 7, the disk valve 2 maintains the closed state and prevents the steam from leaking.

After that, high-temperature drain flows into the disk-type steam trap 1 again, but at this time, the steam in the variable pressure chamber 7 releases heat and the pressure drops, and the disk valve 2 is pushed up by the drain and opens ( Open state) The drain is discharged from the discharge port 52 along the arrow 92 direction. Regarding the pressure change in the variable pressure chamber 7, the air in the cap space 13S functions as a heat insulator to avoid the influence of the outside air temperature, and the heat dissipation rate of the variable pressure chamber 7 is kept constant. Therefore, stable operation of the disk valve 2 can be ensured.

After the high temperature drain is discharged, high temperature steam flows into the disk type steam trap 1 again and the disk valve 2 is closed. The valve closing or opening is repeated by the repetitive upward or downward movement of the disc valve 2 as described above.

Here, as described above, three sliding balls 3a, 3b, and 3c are provided on the side surface of the disk valve 2, and protrude from the side surface of the disk valve 2 to contact the contact surface 11a of the main body 11. . The sliding balls 3a, 3b, and 3c rotate and slide as the disk valve 2 floats in the direction of the arrow 95. As shown in FIG. Therefore, when the disc valve 2 floats, even if the posture of the disc valve 2 deviates obliquely from the horizontal position, the sliding balls 3a, 3b, and 3c rotate and slide The disk valve 2 can float smoothly. Therefore, by ensuring proper floating of the disk valve 2, malfunction of the disk steam trap 1 can be prevented.

[Other embodiments]
In the above-described embodiment, the spherical sliding balls 3a, 3b, and 3c were exemplified as the sliding portions, but the present invention is not limited to this. Other configurations can be adopted as long as they can slide against the contact surface 11a (the inner wall of the valve chamber). For example, it is possible to use a sliding portion that is supported by a rotating shaft and slides against the inner wall of the valve chamber by rotating around the rotating shaft.

Also, in the above-described embodiment, three sliding balls 3a, 3b, and 3c are shown as sliding portions, but four or more or two or less sliding portions may be provided. Furthermore, although an example in which the three sliding balls 3a, 3b, and 3c are arranged at equal intervals in the circumferential direction of the side surface of the disc valve 2 (disc-type valve body) is given, some or all of the intervals are different. It is also possible to arrange and configure the sliding portions so as to be spaced apart.

In the above-described embodiment, the sliding balls 3a, 3b, and 3c, which are the sliding portions, are in contact with the contact surface 11a (the inner wall of the valve chamber) all the time. , 3b, 3c and the contact surface 11a. Even in this case, when the disk valve 2 floats, if the attitude of the disk valve 2 deviates obliquely from the horizontal position, the sliding balls 3a, 3b, and 3c contact the contact surface 11a and rotate. and the disk valve 2 floats smoothly.

Furthermore, guide grooves for guiding the sliding of the sliding balls 3a, 3b, 3c (sliding portions) can be formed on the contact surface 11a (inner wall of the valve chamber). By sliding the sliding balls 3a, 3b, 3c along the guide grooves, the disk valve 2 (disk-type valve body) can be stably floated.

1: Disc type steam trap 2: Disc valve 3a, 3b, 3c: Sliding ball
7: Variable pressure chamber 11: Body 12: Lid 11a: Contact surface 31: Body inflow path
32: Valve seat inlet 33: Valve seat outlet 51: Inlet 52: Outlet

Claims (4)

A main body having therein a flow path through which a fluid passes and a valve chamber communicating with the flow path,
A disk-type valve body positioned floatably in the valve chamber, closing the flow path when in the closed state and opening the flow path when in the open state;
In a disc steam trap with
A retaining portion formed on the side of the disk-shaped valve body located along a plane parallel to the floating direction of the disk-shaped valve body, the thickness in the floating direction gradually decreasing toward the inner wall of the valve chamber. a retaining portion formed to:
a sliding part held by the holding part , the sliding part being slidable against the inner wall of the valve chamber when the disk-shaped valve element floats;
A disk-type steam trap characterized by comprising: In the disk type steam trap according to claim 1,
A plurality of the sliding portions are arranged at equal intervals in the circumferential direction of the side portion of the disk-shaped valve body,
A disc type steam trap characterized by In the disk-type steam trap according to claim 1 or claim 2,
The sliding part is configured in a spherical shape and slides by rotating,
A disc type steam trap characterized by It is positioned floatably in a valve chamber formed inside the main body of the steam trap, closes the flow path communicating with the valve chamber when in the closed state, and opens the flow path when in the open state. In the disk type valve body used for the steam trap that opens,
a retaining portion formed on a side portion positioned along a plane parallel to the floating direction, the retaining portion formed such that the thickness in the floating direction gradually decreases toward the inner wall of the valve chamber;
a sliding part held by the holding part , the sliding part being slidable against the inner wall of the valve chamber when floating;
A disk-type valve body used in a steam trap, comprising:

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