JPH07253193A - Temperature controlled trap - Google Patents

Abstract

PURPOSE:To provide the temperature control trap which can maintain the function of a trap even when a valve port is blocked. CONSTITUTION:A communication paths 20 and 21 are formed between an inlet port 1 and an outlet port 2. A ball valve 22 is interposed between the communication paths 20 and 21 in such a way as to be freely rotatable. A through hole 23, a blow passage 24 and an orifice passage 25 are provided for the ball valve 22 with the angle of 90 parted. When a valve port 12 is blocked, the rotation of the ball valve 22 enables the inlet port 1 to be communicated with the outlet port 2 through the blow passage 24 or the orifice passage 25.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temperature control trap for automatically discharging condensate water having a temperature lower than a predetermined temperature, and more particularly to a temperature control trap capable of maintaining a function as a trap even when a valve opening is clogged.

A temperature control trap is attached to the end of a steam trace pipe installed in a petroleum plant or the like for the purpose of keeping the temperature of an oil feed pipe, and discharges steam condensate that has fallen below a predetermined temperature. The heat retention temperature is maintained at a desired value, and hundreds to thousands of temperature control traps are used in a large-scale plant.

[0003]

2. Description of the Related Art As a conventional temperature control trap, for example, the one disclosed in Japanese Utility Model Publication No. 6-3274 has been used. This is provided with an additional connection port that can be selectively opened to the condensate reservoir and the outlet side pipe connection port,
An on-off valve is attached to this connection port so that foreign matter adhering and accumulated on the screen as a strainer can be removed from the on-off valve to the outside.

[0004]

SUMMARY OF THE INVENTION In the above conventional one,
Although the strainer can be blown, there was a problem that it could not function as a trap when the valve mouth was blocked. Foreign substances such as dust and rust in the pipes sometimes entered the inside of the temperature control trap, and often the valve opening was blocked as well as the strainer. If the valve port is closed and cannot function as a trap, the temperature of the steam trace tube cannot be maintained at a desired value, which causes problems such as solidification of oil in the pipe.

Further, in the above conventional temperature control trap,
When the valve port is closed, the condensate can be discharged by opening the on / off valve of the additional connection port, but there is also a problem that a large amount of steam is also discharged with the condensate, resulting in steam loss. .

Therefore, the technical problem of the present invention is that the steam loss is not caused, and the function of the trap is maintained even if foreign matter such as dust flows in to maintain the temperature of the steam trace tube at a desired value. To obtain a temperature control trap that can be done.

[0007]

Means for Solving the Problems The technical means of the present invention taken to solve the above technical problems is to form a valve chamber in a valve casing having an inlet and an outlet, and to form the valve chamber and the outlet. A valve seat member that opens a valve port that communicates with the valve casing is attached to the valve casing, and the valve means is driven by a temperature-sensing member arranged in the valve chamber to open and close the valve port. Is formed so that a valve member for communicating and blocking the passage is rotatably arranged in the communication passage, and a blow passage and an orifice passage are provided in the valve member.

[0008]

The operation of the above technical means is as follows.
By arranging a rotatable valve member in the communication passage and providing a blow passage and an orifice passage in this valve member, the valve member can be rotated even if the valve opening is blocked by foreign matter such as dust. By doing so, the inlet and the outlet of the trap can be connected by the blow passage and the orifice passage.

The trap portion can be blown by connecting the inlet and the outlet of the trap with the blow passage, and the trap can be generated in the steam trace tube by connecting with the orifice passage having an orifice of an appropriate diameter. Condensate can be discharged to maintain the trap function. By making the orifice diameter large enough to discharge the condensate generated in the steam trace tube, it is possible to provide a trap in which the condensate hardly stays and the steam can be prevented from being discharged.

[0010]

EXAMPLES Examples showing specific examples of the above technical means will be described. A valve casing is formed by the main body 3 having the inlet 1 and the outlet 2 and the lid 4, and the valve chamber 5 is formed therein. The valve chamber 5 and the inlet 1 communicate with each other through the passage 30, and the valve chamber 5 and the outlet 2 communicate with each other through the passage 31. A cylindrical screen 32 having a large number of fine holes is arranged in the valve chamber 5, and a plurality of bimetal plates 6 and 7 as temperature-sensitive members are provided inside the screen 32.
Attach to the center of. The bimetal plates 6 and 7 are vertically deformed into a convex shape as shown in FIG. 1 at a desired high temperature, and are flatly deformed at a low temperature. The upper portion of the valve rod 8 is slidably arranged in a guide hole 10 formed at the center of the temperature adjusting screw 9. The lower end of the valve rod 8 is the valve body 11, and the valve seat member 13
It is arranged on the valve opening 12 formed in the above. The valve seat member 13 is provided with through holes 14 and 15 so that condensed water in the valve chamber 5 can be discharged. A coil spring 17 in a compressed state is arranged around the valve seat member 13 between the lower end of the valve chamber 5 and the spring receiver 16. The spring receiver 16 is prevented from being displaced in the upward direction by the flange portion 18 of the valve rod 8, and the spring force of the coil spring 17 urges the valve rod 8 and the valve body 11 in the valve opening direction.

In the main body 3, a communication passage 2 is provided between the inlet 1 and the outlet 2.
0 and 21 are formed, and a ball valve 22 as a spherical valve member is arranged between the communication passages 20 and 21. Although not shown, the ball valve 22 is arranged so as to be rotatable clockwise or counterclockwise by a handle provided on the front side of the drawing,
A communication hole 23, a blow passage 24, and an orifice passage 25 are provided inside at an angle of 90 degrees. Ball valve 2
A ring-shaped valve seat ring 26 made of synthetic resin, synthetic rubber, carbon or the like is attached to the periphery of 2 to maintain airtightness between the ball valve 22 and the valve casing.

Next, the operation will be described. When the temperature of the condensed water flowing into the valve chamber 5 from the inlet 1 is lowered, the plurality of bimetal plates 6 and 7 are deformed from the state shown in FIG. 1 to a flat shape, and the valve rod 8 is upwardly moved by the spring force of the coil spring 17. Due to the displacement, the valve body 11 opens apart from the valve opening 12, and the low temperature condensate is discharged to the outlet 2 through the through holes 14 and 15 and the passage 31. When the low-temperature condensate is discharged and the temperature of the condensate rises to a desired value, the bimetal plates 6 and 7 are deformed in a vertically convex shape as shown in FIG. 1 and the valve rod 8 is pushed down to close the valve port 12. And stop draining condensate. In this way, the valve port 12 opens and closes according to the temperature of the condensate that flows in to maintain the temperature of the steam trace pipe (not shown) located on the inlet 1 side within a predetermined range to keep the oil delivery pipe warm. To do.

The temperature of the oil delivery pipe is not maintained continuously throughout the year, but it is often performed only during the oil delivery. When oil delivery is not performed, the steam trace tube and the temperature control trap are used. Becomes dormant. If the period of the rest state is long, rust or the like is likely to occur in the valve casing, and the rust causes the valve body 11 to be fixed to the valve seat member 13 to close the valve opening 12. In addition, foreign matter such as minute rust and dust generated in the pipe when oil feeding is restarted passes through the screen 32 and flows into the valve chamber 5 to close the valve opening 12. There is also.

When the valve port 12 is closed, the ball valve 22 is rotated clockwise by 90 degrees from the state shown in FIG. 1 so that the inlet 1 and the outlet 2 are connected to the communication passage 20 and the communication hole. 23, the blow passage 24, and the communication passage 21 are communicated with each other, so that low-temperature condensate and foreign matters such as dust accumulated in the steam trace pipe on the inlet 1 side can be blown in a short time.
can do. When the blow is finished, the ball valve 22
Further, the inlet 1 and the outlet 2 are communicated with each other through the blower passage 24 and the orifice passage 25 by further rotating the inlet 90 degrees clockwise, and the condensed water generated at the inlet 1 side can be discharged. By appropriately designing the diameter of the orifice passage 25, it is possible to achieve a trap function that hardly condenses the condensate on the inlet 1 side and prevents vapor discharge.

[0015]

As described above, according to the present invention, even when the valve port is blocked by foreign matter such as dust, the rotatable valve member is rotated to connect the inlet and outlet of the trap to the blow passage. With the orifice passage, the inside of the trap can be blown by using the blower passage, and the trap function of discharging the condensed water generated through the orifice can be maintained by using the orifice passage. The steam trace tube can be kept warm, and no steam loss will occur.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a temperature control trap of the present invention.

[Explanation of symbols]

 1 inlet 2 outlet 3 main body 5 valve chamber 6,7 bimetal plate 8 valve rod 11 valve body 12 valve opening 20,21 communication passage 22 ball valve 23 through hole 24 blow passage 25 orifice passage

Claims (1)

[Claims] 1. A valve seat is formed in a valve casing having an inlet and an outlet, a valve chamber is formed in the valve casing, and a valve opening for communicating the valve chamber and the outlet is opened. In the one in which the valve means is driven by the temperature sensitive member to open and close the valve opening, a communication passage that connects the inlet and the outlet to the valve casing is formed,
A temperature control trap comprising a valve member rotatably disposed in the communication passage so as to cut off the passage, and a blow passage and an orifice passage are provided in the valve member.