JP2005273740A - Thermostatic trap - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent damage to a bellows by preventing the bellows from excessively extending more than necessary even if a sealing cover is detached from a valve box under a condition that the bellows is not cooled at the time of inspection or the like. <P>SOLUTION: A valve opening 19 communicating a primary side flow passage 5 and a secondary side flow passage 6 is provided in a valve box 1. A valve element 25 opening and closing the valve opening 19 is projectingly provided on one end of the bellows 24 filled with volatile liquid. A deterrent plate 26 having the valve element 25 inserted therethrough and capable of abutting on and supporting one end of the bellows 24 at an extension position which is longer than extension of the bellows corresponding to a close condition of the valve element 25 and does not fracture the bellows 24 is provided on a sealing cover 2 of the valve box 1 having another end attached. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a thermostatic trap.

Conventionally, as this type of trap, one end of a bellows filled with volatile liquid is fixed to a sealing lid that hermetically closes the valve box, and a valve body that opens and closes the valve port is provided at the other end. When steam flows in, the liquid in the bellows evaporates and expands, and the bellows expands, so that the valve body closes the valve port, and when condensate flows into the valve box, the bellows is cooled and the inside of the bellows is cooled. There is a vapor pressure type in which the vapor pressure of the liquid is lowered and the bellows contracts, and the valve element opens the valve port (see, for example, Non-Patent Document 1).
Such traps need to be inspected, cleaned, etc. by removing the hermetic lid from the valve box, especially when the valve is closed and vapor leaks due to dust trapped between the valve body and the valve seat. is there.
At this time, if the bellows is not sufficiently cooled and the sealing liquid is removed while the liquid inside the bellows is evaporated / expanded, the expansion of the bellows is restricted by the valve body sitting on the valve seat. This is released, and the bellows stretches to its limit, causing a risk of cracking and damaging the bent portion of the bellows.
In order to solve the above-mentioned problem, in Patent Document 1, a frame surrounding a bellows integrally formed with a valve body is fixed to a sealing lid, and a valve seat in which the valve body can be freely attached and detached is provided in the frame. A frame fixed to the sealing lid even if the sealing lid is removed in a state where the bellows is not sufficiently cooled as described above by providing the valve seat detachably at the valve opening provided in the valve box. Since the valve seat is integrally formed and the valve body is seated on the valve seat, the bellows is prevented from being damaged by restricting the bellows from being excessively extended.
Edited by Japan Valve Industry Association, “Valve Manual” published by Nikkan Kogyo Shimbun, published on March 30, 1940, p. 448, FIG. 7, 127 JP-A-8-270893

However, in the trap configured as described above, when dust is caught between the valve seat and the valve body, the frame must be disassembled to separate the valve seat and the valve body seated on the frame. When the frame is disassembled in a state where the bellows is not sufficiently cooled, it becomes impossible to regulate the excessive expansion of the bellows, and eventually the bellows is excessively stretched and is damaged.

In view of the above problems, the present invention provides a valve box having a valve port communicating with a primary flow path and a secondary flow path in a valve box, and one end of a bellows in which a volatile liquid is sealed in a valve body that opens and closes the valve opening. The valve body is inserted into the sealing lid of the valve box projecting to the other end and inserted into the extended position where the bellows does not break and the bellows does not break, and the bellows A thermostatic trap provided with a deterrent plate capable of abutting and supporting one end thereof is provided to solve the above problem.
In addition, the suppression plate may be provided with a communication hole at a position corresponding to the outer side of the outer diameter of the bellows,
Further, the restraining plate and the bellows may be detachably provided on the sealing lid.

In short, the present invention according to claim 1 is a bellows in which a valve port that communicates a primary side channel and a secondary side channel is provided in a valve box, and a valve body that opens and closes the valve port is sealed with a volatile liquid. The valve body is inserted into a sealing lid of the valve box that protrudes at one end and is attached to the other end at an extended position where the bellows does not break and is longer than the extension of the bellows corresponding to the closed state of the valve body, Since a depressing plate that can support and support one end of the bellows is provided, normally, when steam with high temperature flows into the valve box, the liquid in the bellows evaporates and expands, and the bellows expands. The valve is closed by inserting the plate, and conversely, when condensate or air with low temperature flows into the valve box, the bellows contracts and the valve body opens the valve opening, automatically steam and condensate. And only condensate can be discharged outside.
When the inside of the valve box is inspected, the bellows is not sufficiently cooled, and even if the sealing lid is removed while the liquid inside the bellows is evaporated / expanded, one end of the extended bellows acts as a deterrent plate. Since it is always abutted and supported, and it is restricted that it extends more than necessary, it will not be damaged, and a valve body is provided on the sealing lid removed from the valve box, and the valve body is a valve in the valve box. Since it can be removed from the mouth, the state of the valve body and the valve mouth (valve seat) can be confirmed, and cleaning can be performed easily.

In the invention described in claim 2, since the communication plate is provided in the position corresponding to the outer side of the outer diameter of the bellows, the pressure when the steam flows into the valve box is reduced in the bellows. It is possible to transmit the temperature of the steam to the bellows through the communication hole in a state where the pressure is relieved without being applied to the bending / extension part of the part at once, and the pressure is relieved. The load generated in the bellows portion can be reduced, and damage to the bellows caused by the load can be prevented.
In addition, the communication hole can serve as a drainage hole when steam around the bellows condenses, thereby preventing the condensate from staying in the bellows accommodating space defined by the sealing lid and the restraining plate. Can be resolved.

In the invention described in claim 3, since the restraining plate and the bellows are detachably provided on the sealing lid, when the bellows or the valve body is broken or damaged by inspection, the restraining plate is removed from the sealing lid and the bellows (valve body). The practical effects such as being able to exchange are significant.

An embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 is a longitudinal sectional view of a thermostatic trap in a closed state, and FIG. 2 is a longitudinal sectional view in a valve opened state. This trap mainly includes a valve box 1 and a sealing lid 2 of the valve box 1. It is configured.
The valve box 1 is provided with an inlet 3 and an outlet 4 on the left and right sides thereof, and is provided with a primary channel 5 and a secondary channel 6 that communicate with the inlet 3 and the outlet 4, respectively.
Each of the primary side flow path 5 and the secondary side flow path 6 is formed with a perforation formed vertically in the middle of the upper and lower directions in the middle thereof, and an upper concave portion 7 provided in a circular shape on the upper and lower sides of the valve box 1 and It communicates with the lower recess 8.
Further, in the valve box 1, a shaft hole 9 is provided on the longitudinal center axis line from the upper recess 7 to the lower recess 8.
A rotating plate 10 to which the hermetic lid 2 is attached is rotatably mounted in the upper recess 7, and a rotating shaft 10 a protruding from the center of the bottom of the rotating plate 10 is inserted into the shaft hole 9, and the lower recess 8 is inserted. At the lower end of the rotating shaft 10a protruding to the bottom, a disc-like shape is slidably brought into close contact with the upper surface of the lower recess 8 in which the lower ports 5a and 6a of the primary channel 5 and the secondary channel 6 are opened. A rotary valve body 11 is pivotally attached, and a nut 13 is screwed to the lower part of the rotary valve body 11 via a pair of disc springs 12 and 12a superposed vertically, and by tightening the nut 13, the primary side An upper recess 7 in which the upper ports 5b and 6b of the channel 5 and the secondary channel 6 are opened.
The rotating disc 10 and the rotating valve body 11 are in close contact with the bottom surface of the lower surface and the upper surface of the lower recessed portion 8 respectively.
As described above, the lower concave portion 8 that accommodates the rotating valve body 11 and the like has an internal space (hereinafter referred to as a bypass chamber).
Called 14. ) Is hermetically closed by the lower lid 15.

The turntable 10 has an inflow path 16 and an outflow path 17 communicating with the primary side flow path 5 and the secondary side flow path 6, respectively, and is formed in the center of a flat bottom 18 that is shallowly recessed on the top surface of the turntable 10. Outflow passage that becomes valve 19
The upper opening 17 is opened, and the upper opening 16 a of the inflow channel 16 is opened near the valve opening 19 in the flat bottom 18.
In the state where the inflow path 16 and the outflow path 17 are communicated with the primary side flow path 5 and the secondary side flow path 6, the rotary valve body 11 is connected to the primary side flow path 5 and the secondary side flow path 6. Each lower port 5a, 6a is set so as to be airtightly closed, and by rotating the turntable 10 from this state, the inflow path 16 and the outflow path 17 are respectively connected to the primary side flow path 5 and the secondary side flow path. In a state where the upper ports 5b and 6b are closed in an airtight manner by the turntable 10 without being communicated with 6, the bypass holes 20 and 20a penetrating at appropriate positions of the rotary valve body 11 are connected to the primary flow path 5 and the secondary flow path. It is set so as to correspond to the lower ports 5a and 6a of the side flow path 6, whereby the primary side flow path 5 and the secondary side flow path 6 communicate with each other via the bypass chamber 14.
Further, an annular jetty 21 concentric with this is provided around the valve port 19 in the flat bottom 18, and a disc-shaped strainer 22 having the same diameter as the flat bottom 18 is externally fitted to the annular jetty 21. .
A sealing lid 2 that hermetically closes the flat bottom portion 18 is fixed to the turntable 10 with a plurality of bolts 23.

The sealing lid 2 is provided with a circular concave inner space, and a screw rod 24a projecting from the upper end of a metal bellows 24 filled with a volatile liquid such as alcohol is screwed to the center of the upper surface of the inner space to be sealed. A bellows 24 is detachably attached to the lid 2.
At the center of the lower end of the bellows 24, a valve body 25 having a smaller diameter and opening and closing the valve port 19 is provided.
The valve body 25 can be freely attached to and detached from the valve seat 19a provided on the peripheral edge of the valve port 19 by the expansion and contraction of the bellows 24.
In the sealing lid 2, the valve body 25 is inserted into an extended position where the bellows 24 is not extended and the bellows 24 is not broken, corresponding to the closed state of the valve body 25, and the lower end of the bellows 24 is abutted and supported. A deterrence plate 26 that is made possible is provided.
In addition, as shown in the illustrated example, it is desirable that the suppression plate 26 is installed on the sealing lid 2 so that the lower end of the suppression plate 26 is in contact with and supported at the extended position of the bellows 24 corresponding to the closed state of the valve body 25.
This restraining plate 26 is made of a thin circular metal plate provided with an insertion hole 26a of the valve body 25 in the center. On the inner periphery of the sealing lid 2, the restraining plate 26 is connected to the annular stepped portion 27 provided at the corresponding position at the above position. By attaching a C-shaped retaining ring 29 to an annular groove 28 that is provided around the outer peripheral edge of the annular stepped portion 27 and between which the thickness of the restraining plate 26 is separated, the restraining plate 26 is attached to the sealing lid 2. Is detachably fixed.
In this way, the accommodation space of the bellows 24 partitioned in the hermetic lid 2 by fixing the restraining plate 26 constitutes a bellows chamber 30.
Further, a plurality of communication holes 31 are provided in the restraining plate 26 at positions corresponding to the outside of the outer diameter of the bellows 24, and the communication holes 31 are preferably formed narrow as shown in the illustrated example. .
In the present embodiment, the restraining plate 26 is detachably provided on the sealing lid 2 by the C-shaped retaining ring 29. However, the restraining plate 26 can be detachably attached by screwing the restraining plate 26 to the sealing lid 2. May be.

Next, the operation of the thermostatic trap according to the present invention will be described.
This trap should be piped to the steam line, usually as shown in Figs.
The primary side flow path 5 and the secondary side flow path 6 are connected to the inflow path 16 and the outflow path 17, respectively, and the lower ports 5a and 6a of the primary side flow path 5 and the secondary side flow path 6 are connected to the rotary valve body. 11 is closed, and steam and condensate are separated and only condensate is automatically discharged.
That is, when high-temperature steam flowing into the valve box 1 through the primary channel 5 flows into the bellows chamber 30 from the communication hole 31, the liquid in the bellows 24 evaporates and expands, and the bellows 24 expands. Disc
25 sits on the valve seat 19a and closes the valve port 19 to prevent the steam from flowing out to the secondary side (see FIG. 1).
In addition, since the communication hole 31 provided in the suppression plate 26 is located outside the outer diameter of the bellows 24 in the suppression plate 26, the pressure when the steam flows into the valve box 1 is received by the suppression plate 26. The temperature of the steam is transmitted to the bellows 24 through the communication hole 31 in a state where the pressure is reduced and the pressure is relaxed.
Further, when condensate flows into the valve box 1 and the bellows 24 is cooled, the vapor pressure of the liquid inside the bellows 24 decreases, the bellows 24 contracts, and the valve body 25 is detached from the valve seat 19a. Open valve 19
The condensate is discharged from the secondary side passage 6 (see FIG. 2).
At this time, the condensate in the bellows chamber 30 flows into the valve box 1 through the communication hole 31, and is then drained in the same manner as described above.
When inspecting the inside of the valve box 1, the rotating disk 10 is rotated, and the rotating disk 10
The primary side flow path 5 and the secondary side flow path 6 are communicated through the bypass chamber 14 with the bypass holes 20 and 20a of the rotary valve body 11 corresponding to the lower openings 5a and 6a. The sealing lid 2 is removed from the valve box 1.
At this time, even if the bellows 24 is not sufficiently cooled and the liquid inside the bellows 24 is evaporated and expanded, the bellows 24 is supported by the lower end of the bellows 24 in contact with the restraining plate 26.
Is more than necessary (see FIG. 3).
Further, when the sealing lid 2 is removed, the valve body 25 and the valve seat 19a are separated from each other.
It is possible to visually check whether or not dust or the like is attached to or around a.

It is a longitudinal cross-sectional view which shows the valve closing state of a thermostatic trap. It is a longitudinal cross-sectional view which shows the valve opening state of a thermostatic trap. It is a bottom view of the sealing lid removed from the valve box.

Explanation of symbols

1 Valve box 2 Sealed lid 5 Primary flow path 6 Secondary flow path
19 Valve
24 Bellows
25 Disc
26 Deterrence plate
31 Communication hole

Claims (3)

A valve port is provided in the valve box to communicate the primary and secondary flow paths, and a valve body that opens and closes the valve port is projected from one end of a bellows filled with volatile liquid, and the other end is attached. The valve box's sealing lid can be inserted into the extended position where the bellows does not break, and the end of the bellows can be abutted and supported. Thermostatic trap characterized by the provision of a deterrent plate. 2. The thermostatic trap according to claim 1, wherein the restraining plate is provided with a communication hole at a position corresponding to the outside of the outer diameter of the bellows. The thermostatic trap according to claim 1 or 2, wherein the restraining plate and the bellows are detachably provided on the sealing lid.

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