JPH04370497A - Thermal response type steam trap - Google Patents

Abstract

PURPOSE:To prevent residence of condensate by making able to open a valve member even when a diaphragm 18 damaged. CONSTITUTION:A heat-sensitive chamber 18 comprising a wall member 16, a mounting member 12, and diaphragms 30 and 32 is formed in a valve chamber 4. The outer peripheries of a lower diaphragm 30, a central diaphragm 31, and an upper diaphragm 32 are welded together. The inner periphery of the lower diaphragm 30 and the inner end of the mounting member 12 are welded together. A valve member 20 to open and close a lead-out passage 11 is mounted on the central diaphragm 31, and a through-hole 22 for intercommunicating the upper diaphragm 32 and the lead-out passage 11 is formed in the central diaphragm 32 and the valve member 20.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a steam trap that automatically discharges condensate generated in various steam-using equipment and steam piping, and particularly relates to a steam trap that is heated and cooled by steam and condensate and expands according to the temperature. The present invention relates to a thermally responsive steam trap that uses a thermally responsive member containing a contracting expansion medium to discharge condensate below a desired temperature to the outside of the system.

0002

2. Description of the Related Art A conventional thermally responsive steam trap will be explained with reference to Japanese Patent Publication No. 60-46318. In this system, a temperature control element as a thermally responsive member, in which the wall member and the outer periphery of the diaphragm are fixed and an expansion medium is sealed inside, is placed in a valve chamber communicating with the inlet, and the diaphragm is The valve member disposed within the valve chamber is driven so as to be seated on and off the valve seat member, which has a lead-out passage communicating between the valve chamber and the outlet.

[0003] When high-temperature steam flows into the valve chamber, the expansion medium expands and seats the valve member on the valve seat member, closes the outlet passage and prevents the discharge of steam, allowing low-temperature condensate to When the expansion medium flows in, the expansion medium contracts and causes the valve member to be unseated from the valve seat member, and opens the outlet passage to be discharged out of the system.

0004

[Problem to be Solved by the Invention] In the above system, when the temperature control element is damaged and the expansion medium flows out, the valve member seats on the valve seat member due to the fluid pressure on the inlet side and closes the outlet path. . If the valve is closed when the temperature control element is damaged, condensate cannot be discharged, which may reduce the operating efficiency of steam-using equipment, produce defective products, or cause water hammer. There is a problem of damaging equipment and piping.

[0005] Therefore, the technical problem of the present invention is to enable the valve member to open when the temperature control element as a thermally responsive member is damaged.

[0006]

[Means for Solving the Problems] The technical means of the present invention taken to solve the above technical problems is to form an inlet, a valve chamber, and an outlet with a valve casing, and to create a gap between the valve chamber and the outlet. A valve seat member having a lead-out passage formed therein is disposed, the end of the lead-out passage on the valve chamber side is used as a valve opening, and a heat-sensitive chamber is formed by a wall member and at least three diaphragms having respective ends fixed in the valve chamber. form,
An expansion medium is sealed in the heat-sensitive chamber, a valve member for opening and closing the valve port is attached to the central diaphragm, and a through hole is formed in the central diaphragm and the valve member to communicate with the lower surface of the upper diaphragm and the outlet passage. .

[0007]

[Operation] The operation of the above technical means is as follows. When the temperature of the fluid flowing into the valve chamber from the inlet is high, the expansion medium in the heat-sensitive chamber expands and displaces the central diaphragm toward the valve seat member, causing the valve member to close the valve port and release the hot fluid, i.e., steam. Prevent spills. On the other hand, when low temperature fluid flows in, the expansion medium contracts and the fluid pressure acting on the central diaphragm forces the valve member to separate from the valve seat member, opening the valve port and directing the low temperature fluid, or condensate, to the outlet. Discharge.

If the diaphragm as a thermally responsive member is damaged, the heat-sensitive chamber containing the expansion medium will either communicate directly with the valve opening or communicate with the valve opening through a hole between the upper diaphragm and the central diaphragm. Therefore, the expansion medium is discharged from the outlet and no expansion force can be generated, so that no valve-closing force is generated to close the valve port, and the valve remains open. In this case, if the central diaphragm is not damaged, fluid pressure acts on the central diaphragm in the direction of opening the valve, thereby making the valve opening more reliable. Also,
If the central diaphragm is damaged, the expansion medium will not flow out, but since the inlet and outlet communicate through the through hole, the outlet path will not be closed.

[0009]

[Example] An example showing a specific example of the above technical means will be described. An upper casing 1 and a lower casing 2 are fastened together with bolts 3 to form a valve casing having a valve chamber 4 inside. Airtightness between the two casings 1 and 2 is maintained by an annular gasket 5. Inlet 6 in upper casing 1, lower casing 2
An outlet 7 is formed at the outlet 7.

A valve seat member 9 is provided on the partition wall 8 between the valve chamber 4 and the outlet 7.
Connect with screws. Airtightness between the partition wall 8 and the valve seat member 9 is maintained by an annular gasket 10. A lead-out passage 11 is formed in the center of the valve seat member 9 to communicate the valve chamber 4 and the outlet 7. An annular groove is formed on the upper surface of the valve seat member 9 to fix the mounting member 12. Further, the valve seat member 9 has a plurality of passages 13 in the upper part thereof through which fluid passes.

Above the mounting member 12 are a lower diaphragm 30, a central diaphragm 31, and an upper diaphragm 32.
and wall members 16 are arranged in sequence. diaphragm 30
, 31 and 32 are welded together, the inner diameter portion of the lower diaphragm 30 is welded to the mounting member 12, and the wall member 16 is also welded and fixed to the mounting member 12. The wall member 16, the upper diaphragm 32, and the lower diaphragm 30 constitute a heat-sensitive chamber 18. An expansion medium is enclosed within the heat sensitive chamber 18. The expansion medium is formed by water and a fluid with a lower boiling point than water, such as alcohol, or mixtures thereof.

The central diaphragm 31 has an opening in the center, the edge of the opening is bent downward, and the ring-shaped valve member 20 is disposed outside the opening. The central diaphragm 31 and the valve member 20 deform the top and bottom of the annular member 21 inserted into the opening outward and fix it. Upper diaphragm 3 with annular member 21
A through hole 22 is formed that communicates the lower surface of the opening 2 with the outlet path 11.

When the temperature of the fluid flowing into the valve chamber 4 from the inlet 6 is high, the expansion medium in the heat sensitive chamber 18 expands and displaces the valve member 20 downwardly through the upper diaphragm 32 and the central diaphragm 31; The valve member 20 is seated on the valve seat member 9 to close the outlet passage 11 and prevent hot fluid, ie, steam, from flowing out.

When the fluid temperature becomes lower than a predetermined value due to heat radiation or the like, the expansion medium contracts, and the valve member 20 is separated from the valve seat member 9 by the fluid pressure on the inlet 6 side, opening the outlet passage 11. The low-temperature fluid, ie, low-temperature condensate, is discharged from the system through the outlet 7.

If the diaphragm 32 is damaged, the expansion medium in the heat-sensitive chamber 18 will be discharged to the outlet 7 through the through hole 22, so that no expansion force will be generated even if high-temperature fluid flows into the valve. The member 20 never closes,
Keep the valve open. Even if the lower diaphragm 30 breaks, the expansion medium is discharged to the outlet 7 to maintain the open valve state. If the central diaphragm 31 is damaged, the inlet 6 and the outlet 7 are communicated via the passage 13, the damaged area, and the through hole 22 to prevent condensate from accumulating.

[0016]

[Effects of the Invention] As described above, in the present invention, when a thermally responsive member is damaged, the outlet path can be maintained in a communicating state, so that the operational efficiency of steam-using equipment is reduced due to accumulation of condensate, and defective products are prevented. No water hammer or water hammer occurs. In addition, when the pressure on the outlet side becomes higher than that on the inlet side, fluid from the outlet flows through the through hole and flows between the upper diaphragm and the center diaphragm, displacing the center 2 diaphragm toward the valve seat member side. Therefore, the valve port can be closed to prevent backflow.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an embodiment of a thermally responsive steam trap of the present invention.

[Explanation of symbols]

4 Valve chamber 6 Entrance 7 Exit 9 Valve seat member 11 Derivation path 16 Wall components 18 Heat sensitive chamber 20 Valve member 22 Through hole 30 Lower diaphragm 31 Central diaphragm 32 Upper diaphragm

Claims (1)

[Claims] Claim 1: An inlet, a valve chamber, and an outlet are formed in a valve casing, and a valve seat member is arranged between the valve chamber and the outlet, and a lead-out passage is formed, and the valve-chamber side end of the lead-out passage is connected to the valve seat member. A valve member that forms a heat-sensitive chamber as a port by a wall member and at least three diaphragms having their respective ends fixed in the valve chamber, seals an expansion medium in the heat-sensitive chamber, and opens and closes a valve port in a central diaphragm. A heat-responsive steam trap in which a through hole is formed in the central diaphragm and valve member to communicate the bottom surface of the upper diaphragm and the outlet path.