JP5932359B2 - Thermally responsive steam trap - Google Patents

Description

The present invention relates to a steam trap that automatically discharges condensate generated in various steam-using devices and steam pipes, and in particular, a temperature controller including a medium that is heated and cooled by steam and condensate and expands and contracts according to the temperature. The present invention relates to a thermally responsive steam trap that discharges condensate at a predetermined temperature or less out of the system using element.

A conventional thermally responsive steam trap is disclosed in Patent Document 1, for example. This is because the valve casing forms an inlet, a valve chamber, and an outlet, and a valve seat member having a lead-out path is disposed between the valve chamber and the outlet, and the outer peripheral edge between the upper and lower wall members and both wall members. Displacement of the diaphragm due to expansion and contraction of the expansion medium is disposed in the valve chamber by a temperature control element comprising a diaphragm with a fixed surface, an expansion medium sealed between the upper wall member and the diaphragm, and a valve member connected to the diaphragm. The valve member is separated from and seated by the valve seat member to open and close the lead-out path, and an annular protrusion is formed between the outer peripheral edge fixing portion of the diaphragm and the valve member connecting portion, and the lower surface of the diaphragm is in contact with the bottom. The upper surface of the wall member is formed in the same shape as or similar to the lower surface of the diaphragm.

Japanese Patent Laid-Open No. 6-300187

The above-mentioned conventional thermally responsive steam trap has an annular protrusion formed between the outer peripheral edge fixing portion of the diaphragm and the valve member connecting portion, so that the diaphragm is easily deformed by the expansion / contraction action of the expansion medium, and is displaced. The amount is also large. In addition, since the upper surface of the lower wall member with which the lower surface of the diaphragm abuts is formed in a shape that is the same as or similar to the lower surface of the diaphragm, even if the diaphragm abuts against the lower wall member due to a large force due to expansion of the expansion medium, It is possible to prevent bending or the like from occurring and to maintain a long useful life. However, when the diaphragm comes into contact with the upper wall member due to a large force due to the contraction of the expansion medium, the diaphragm is bent, and there is a problem that the service life cannot be kept long.

Therefore, the problem to be solved by the present invention is to make it possible to keep the service life of the diaphragm long.

In order to solve the above-described problems, the thermally responsive steam trap of the present invention has an inlet, a valve chamber, and an outlet formed by a valve casing, and a valve seat member having a lead-out path is disposed between the valve chamber and the outlet. The upper and lower wall members, a diaphragm with an outer peripheral edge fixed between both wall members, an expansion medium sealed between the upper wall member and the diaphragm, a stopper fixed to the upper wall member, and a diaphragm are connected to the diaphragm. A temperature control element comprising a valve member is disposed in the valve chamber, and the outlet member is opened and closed by detaching and seating the valve member on the valve seat member by displacement of the diaphragm due to expansion and contraction of the expansion medium. An annular protrusion is formed between the peripheral edge fixing portion and the valve member connecting portion, and the upper surface of the lower wall member with which the lower surface of the diaphragm abuts is formed in a shape that is the same as or similar to the lower surface of the diaphragm. , In which the upper surface of the diaphragm has a lower surface abutting the stopper is formed on the upper surface and the same or approximate to the shape of the diaphragm.

According to the present invention, an annular projecting portion is formed between the outer peripheral edge fixing portion of the diaphragm and the valve member connecting portion, and the upper surface of the lower wall member with which the lower surface of the diaphragm abuts is the same or approximate to the lower surface of the diaphragm The lower surface of the stopper with which the upper surface of the diaphragm abuts is formed in the same shape as or similar to the upper surface of the diaphragm, so that the diaphragm abuts against the lower wall member due to a large force due to expansion of the expansion medium. The diaphragm can be prevented from being bent, and the diaphragm can be prevented from being bent even if the diaphragm comes into contact with the stopper due to a large force due to the contraction of the expansion medium, and the service life can be kept long. It produces an excellent effect.

It is sectional drawing of the thermally responsive steam trap concerning embodiment of this invention.

Hereinafter, an embodiment of the present invention will be described with reference to FIG. The upper casing 1 and the lower casing 2 are screwed together to form a valve casing having a valve chamber 3 therein. An inlet 4 is formed in the upper casing 1, and an outlet 5 is formed in the lower casing 2. A valve seat member 7 is screwed to a partition wall 6 between the valve chamber 3 and the outlet 5. In the center of the valve seat member 7, a through lead-out path 8 that communicates the valve chamber 3 and the outlet 5 is formed. A temperature control element 9 is located above the valve seat member 7. The temperature control element 9 includes an upper wall member 11 having an inlet 10, a plug member 12 that seals the inlet 10, a first diaphragm 14 that forms a storage chamber 13 between the upper wall member 11, and an accommodation An expansion medium 15 sealed in the chamber 13; a valve member 16 that opens and closes on the valve seat member 7 to open and close the outlet passage 8; a second diaphragm 18 that fixes the valve member 16 together with the annular member 17; The two diaphragms 14 and 18 include a lower wall member 19 that is fixed with the outer peripheral edge of the two diaphragms 14 and 18 sandwiched between the upper wall member 11 and a stopper 20 that is fixed to the upper wall member 11. The expansion medium 15 is formed of water, a liquid having a lower boiling point than water, or a mixture thereof.

The first diaphragm 14 is formed in a waveform having a plurality of concentric annular protrusions 21. The second diaphragm 18 is also formed in a waveform having a plurality of concentric annular protrusions 22 along the annular protrusion 21 of the first diaphragm 14. A concentric wave that is the same as or close to the lower surface of the second diaphragm 18 so that the upper surface of the lower wall member 19 with which the lower surface of the second diaphragm 18 abuts when the expansion medium 15 expands also follows the waveform of the lower surface of the second diaphragm 18. A shape having a shape portion 23 is formed. Further, the lower surface of the outer peripheral portion of the stopper 20 with which the upper surface of the first diaphragm 14 abuts when the expansion medium 15 contracts is also concentric with the upper surface of the first diaphragm 14 so as to follow the waveform of the upper surface of the first diaphragm 14. It is formed in a shape having a corrugated portion 24. At least one annular protrusion provided on each of the first and second diaphragms 14 and 18 may be formed, and the lower surface and the lower wall of the upper wall member 11 are formed so as to conform to the shapes of the first and second diaphragms 14 and 18. The upper surface of the member 19 may be formed.

The temperature control element 9 is accommodated in a plurality of ribs 25 integrally formed on the inner surface of the lower casing 2, and is urged downward by an elastic member 26 attached to the inner surface of the lower casing 2, so that the bottom of the rib The bottom surface of the lower wall member 19 hits the wall and is held.

The operation of the thermally responsive steam trap of the above embodiment is as follows. When the temperature of the fluid flowing into the valve chamber 3 from the inlet 4 is low, the expansion medium 15 contracts, the first and second diaphragms 14 and 18 are lifted by the fluid pressure in the valve chamber 3, and the valve member 16 is The lead-out path 8 is opened away from the member 7. As a result, a low-temperature fluid, namely condensate, is discharged from the outlet 5. At this time, the upper surface of the first diaphragm 14 contacts the lower surface of the stopper 20. When the high-temperature fluid flows into the valve chamber 3 due to the discharge of the low-temperature fluid, the expansion medium 15 expands, and the valve member 16 is seated on the valve seat member 7 via the first and second diaphragms 14 and 18 to be led out. Channel 8 is closed to prevent outflow of hot fluid or steam. At this time, there is a slight gap between the lower surface of the second diaphragm 18 and the upper surface of the lower wall member 19, and when the expansion medium 15 expands further, the temperature control element 9 resists the biasing force of the elastic member 26. Is displaced upward, and the lower surface of the second diaphragm 18 and the upper surface of the lower wall member 19 come into contact with each other.

INDUSTRIAL APPLICABILITY The present invention can be used for a thermally responsive steam trap that uses a temperature control element including an expansion medium to discharge condensed water having a predetermined temperature or less generated in various steam-using devices and steam pipes to the outside of the system.

DESCRIPTION OF SYMBOLS 1 Upper casing 2 Lower casing 3 Valve chamber 4 Inlet 5 Outlet 7 Valve seat member 8 Derivation path 9 Temperature control element 11 Upper wall member 14 First diaphragm 15 Expansion medium 16 Valve member 18 Second diaphragm 19 Lower wall members 21 and 22 Annular protrusions 23, 24 Waveform part

Claims (1)

The valve casing forms an inlet, a valve chamber, and an outlet, a valve seat member having a lead-out path is disposed between the valve chamber and the outlet, and the outer peripheral edge is fixed between the upper and lower wall members and the both wall members. A temperature control element comprising a diaphragm, an expansion medium sealed between the upper wall member and the diaphragm, a stopper fixed to the upper wall member, and a valve member connected to the diaphragm is disposed in the valve chamber, and the expansion medium The valve member is separated from and seated on the valve seat member by displacement of the diaphragm due to expansion and contraction to open and close the lead-out path, and an annular protrusion is formed between the outer peripheral edge fixing portion of the diaphragm and the valve member connecting portion. in those underside of the diaphragm during inflation of the inflation medium has a top surface abutting the lower wall member formed on the lower surface of the same or approximate to the shape of the diaphragm, the upper surface of the diaphragm when contraction expansion medium contact The thermally responsive type steam trap, characterized in that that the lower surface of the stopper formed on the upper surface and the same or approximate to the shape of the diaphragm.

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