JP5620189B2 - steam trap - Google Patents

Description

The present invention relates to a steam trap that automatically discharges drain generated in a steam piping system, and in particular, can clean foreign matter in a fluid adhering to the inner surface of a discharge passage of a valve seat member that opens and closes when the valve member opens and closes. About.

A conventional steam trap is disclosed in Patent Document 1, for example. The steam trap disclosed here forms an inlet, a valve chamber, and an outlet in a valve casing, and has a valve seat member having a discharge passage communicating with the valve chamber on the outlet side, and is attached to and detached from the valve seat member in the valve chamber. A valve member that opens and closes the discharge passage is disposed, the cleaning member is disposed in the discharge passage, the tip of the cleaning member protrudes from the valve casing, and is screwed to the valve casing so as to be able to advance and retract. The foreign matter adhering to the inner surface of the discharge passage is cleaned by screwing into the casing.

JP2007-107643

The conventional steam trap can clean foreign matter adhering to the inner surface of the discharge passage by screwing the cleaning member into the valve casing from the outside, but it cannot be confirmed from the outside whether or not foreign matter is attached. In addition, there was a problem that the timing of cleaning was delayed or unnecessary cleaning was performed. In addition, if the cleaning member is neglected to be screwed back to the original position after cleaning the foreign material, the valve member cannot be seated on the valve seat member, and the steam leaks or the drainage is prevented, resulting in a decrease in the discharge flow rate. There was a problem to do.

Therefore, the problem to be solved by the present invention is to provide a steam trap capable of confirming from the outside whether foreign matter has adhered to the inner surface of the discharge passage and whether the cleaning member has been screwed back.

In order to solve the above-described problems, the steam trap of the present invention is formed with a valve seat member having a discharge passage that forms an inlet, a valve chamber, and an outlet in a valve casing, and communicates the valve chamber to the outlet side. A valve member that opens and closes the discharge passage by being seated on and off the valve seat member is disposed, the cleaning member is disposed in the discharge passage, and the tip of the cleaning member protrudes from the valve casing and is screwed to the valve casing so as to be able to advance and retract. , Cleaning the foreign matter adhering to the inner surface of the discharge passage by screwing the cleaning member into the valve casing from the outside. A temperature indicator is attached to the outer surface of the valve casing, and the temperature indicator is attached to the outer surface of the valve casing. A case attached to the case, a temperature responsive member accommodated in the case and contracted or expanded by a temperature change in the valve casing, and a temperature responsive member attached to the temperature responsive member is contracted Comprises a movable member that is displaced in the axial direction of the case by extension, and a low-temperature display portion that is attached to one end of the movable member and protrudes from the case when the temperature is lower than a predetermined temperature. The tip of the case to be screwed back is aligned at the same protruding position as the tip of the cleaning member protruding from the valve casing.

According to the present invention, by confirming that the low temperature display portion of the temperature indicator attached to the outer surface of the valve casing of the steam trap protrudes from the valve casing, it is confirmed that the foreign matter has adhered to the inner surface of the discharge passage. This produces an excellent effect that can be confirmed from the outside. In this case, the foreign material adhering to the inner surface of the discharge passage is cleaned by screwing the cleaning member into the valve casing from the outside. And when the front-end | tip of the cleaning member which protrudes from a valve casing becomes below predetermined temperature, a cleaning member is screwed back so that it may become the same protrusion position as the front-end | tip of the case which a low-temperature display part protrudes. In this case, if the front end of the cleaning member is not screwed back to the same protruding position as the front end of the case, it is possible to confirm that the cleaning member is not screwed back from the outside.

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

Hereinafter, an embodiment of the present invention will be described with reference to FIG. A lid 2 is fastened to the main body 1 with bolts 3 to form a valve casing, and a valve chamber 4 is formed inside. The main body 1 has an inlet 5, an outlet passage 6 and an outlet 7, and the inlet 5 communicates with the upper portion of the valve chamber 4. The inlet 5 and the outlet 7 are formed on the same axis in the horizontal direction. A valve seat member 9 having a discharge passage 8 is screwed to the lid 2 at the bottom of the valve chamber 4. The discharge passage 8 includes a small-diameter leading end at the end of the valve chamber 4, a tapered portion whose diameter increases toward the downstream downstream of the leading end, and a large-diameter trailing end downstream of the tapered portion. The lid 2 has an outlet passage 10, and the lower portion of the valve chamber 4 communicates from the discharge passage 8 to the outlet 7 through the outlet passages 10 and 6. A hollow spherical float 11 serving as a valve member that opens and closes the discharge passage 8 by being seated on the valve chamber side end face of the valve seat member 9 is disposed in the valve chamber 4 in a free state. Two float seats 12 with which the float 11 abuts at the position where the discharge passage 8 is closed are provided below the float 11 on the side facing the front side of the drawing.

A plug 13 is screwed to the lid 2 on the same axis as the valve seat member 9. The cleaning member 14 is screwed to the plug 13 so as to be adjustable from the outside. The cleaning member 14 penetrates the plug 13, and an inner end portion located downstream of the distal end portion of the discharge passage 8 protrudes into the valve chamber 4 by advancing, and the distal end portion is located outside. A packing 15 as a sealing member for keeping the cleaning member 14 airtight is disposed between the plug 13 and the cleaning member 14, and a packing presser 16 is screwed to the plug 13 to keep the airtightness between the plug 13 and the cleaning member 14. The outer diameter of the inner end of the cleaning member 14 is slightly smaller than the inner diameter of the tip of the discharge passage 8, and the tip of the discharge passage 8 is the tip of the cleaning member 14 when the cleaning member 14 is advanced. Clean the inside.

A temperature indicator 31 is attached to the outer surface of the lid 2 with, for example, an adhesive tape (not shown). Each case 32 of the temperature indicator 31 is formed of an upper main body 33 and a lower main body 34 each having a substantially quadrangular outer shape and a cylindrical inner shape, and the lower end portion of the upper main body 33 is press-fitted into the upper end portion of the lower main body 34. Fix it. The upper body 33 and the lower body 34 are made of aluminum having a high thermal conductivity. The upper main body 33 and the lower main body 34 may be formed in a polygonal shape such as a substantially triangular shape or a hexagonal shape, or in a cylindrical shape. The upper body 33 integrally has a partition wall 36 having a through hole 35 in the center, and the lower body 34 has a partition wall 38 having a through hole 37 in the center. A movable member 39 is disposed in the case 32 through the through hole 35 and the through hole 37. The movable member 39 is slidably displaced in the axial direction of the case 32 while being guided by the through hole 35 and the through hole 37. One end (lower end) side of the temperature responsive member 40 made of bimetal is welded to the partition wall 38 of the lower main body 34. The other end (upper end) side of the temperature responsive member 40 is welded and attached to substantially the center of the movable member 39. A low temperature display portion 41 having a U-shaped cross section is attached to one end (lower end) side of the movable member 39 with a set screw 42, and a high temperature display portion having a U-shaped cross section on the other end (upper end) side of the movable member 9 43 is attached with a set screw 44. The tip (lower end) of the case 32 from which the low temperature display portion 41 protrudes when the temperature falls below a predetermined temperature is aligned with the same protruding position as the tip (lower end) of the screwed cleaning member 14 protruding from the lid 2, and the outside of the lid 2. A temperature indicator 31 is attached to the surface.

The bimetal is obtained by firmly bonding two kinds of metals or alloys having different thermal expansion coefficients into a plate shape and bending according to a temperature change. A spiral winding made by spirally winding a strip-shaped bimetal flat plate is spirally wound again to form a double spiral winding. In the first spiral shape, the inside is made of a low expansion material and the outside is made of a high expansion material. In the case of this helically wound shape, the radius becomes smaller and the length becomes longer when the temperature is high, and the opposite action occurs when the temperature is low. And in the case of the double helix formed using this, the radius becomes smaller and the length becomes longer when the temperature becomes high, and the opposite action is exerted when the temperature becomes low. The temperature responsive member 40 contracts when the temperature of the steam trap decreases and displaces the movable member 39 downward, and expands when the temperature of the steam trap increases and displaces the movable member 39 upward. When the steam trap automatically discharges the drain automatically without leaking the steam, the low temperature display portion 41 and the high temperature display portion 43 are both immersed in the case 32. Thereby, it can confirm that it is normal. When a foreign substance adheres to the inner surface of the discharge passage 8 and the steam trap cannot automatically discharge the condensate, the temperature responsive member 40 contracts and the movable member 39 is displaced downward. However, the low temperature display portion 41 protrudes from the tip of the case 32. Thereby, it can confirm from the outside that the foreign material has adhered to the inner surface of the discharge channel | path 8. FIG. In this case, the foreign material adhering to the inner surface of the discharge passage 8 is cleaned by screwing the cleaning member 14 into the lid 2 from the outside. And after cleaning a foreign material, the cleaning member 14 is screwed back so that the front-end | tip of the cleaning member 14 may become the same protrusion position as the front-end | tip of the case 32. FIG. When the steam trap leaks steam, the temperature responsive member 40 expands and the movable member 39 is displaced upward, and the low temperature display unit 41 is immersed in the case 32, but the high temperature display unit 43 protrudes from the case 32. To do. Thereby, vapor | steam leakage can be confirmed.

Drain flows into the valve chamber 4 from the inlet 5 and accumulates, and the float 11 rises and falls according to the liquid level and is seated on and off the valve seat member 9 to open and close the discharge passage 8. When the discharge passage 8 is opened, drain in the valve chamber 4 is discharged to the outlet 7 through the discharge passage 8 and the outlet passages 6 and 10, and when the discharge passage 8 is closed, leakage of steam in the valve chamber 4 is prevented. If the drain is normally discharged without leaking the steam, the low temperature display portion 41 and the high temperature display portion 43 are both immersed in the case 32. Thereby, it can confirm that it is normal. When foreign matter adheres to the inner surface of the discharge passage 8 and the condensate cannot be discharged automatically, the low temperature display portion 41 projects from the tip of the case 32. Thereby, it can confirm from the outside that the foreign material has adhered to the inner surface of the discharge channel | path 8. FIG. In this case, the foreign material adhering to the inner surface of the discharge passage 8 is cleaned by screwing the cleaning member 14 into the lid 2 from the outside. And after cleaning a foreign material, the cleaning member 14 is screwed back so that the front-end | tip of the cleaning member 14 may become the same protrusion position as the front-end | tip of the case 32. FIG. When the steam is leaked, the high temperature display portion 43 protrudes from the case 32. Thereby, vapor | steam leakage can be confirmed.

INDUSTRIAL APPLICABILITY The present invention can be used for a steam trap that automatically discharges drain generated in a steam piping system.

DESCRIPTION OF SYMBOLS 1 Main body 2 Lid 4 Valve chamber 5 Inlet 7 Outlet 8 Discharge passage 9 Valve seat member 11 Float 14 Cleaning member 31 Temperature indicator 32 Case 39 Movable member 40 Temperature response member 41 Low temperature display part 48 High temperature display part

Claims (1)

Forming an inlet and the valve chamber and the outlet in the valve housing, said valve chamber fitted with a valve seat member having a discharge passage communicating with the outlet, the discharge passageway and away seated on the valve seat member to said valve chamber closing valves members disposed, to place the cleaning member in the discharge passage, the tip of the cleaning member to protrude from the valve housing and retractable adjustably screwed into the valve casing, said cleaning member from the outside in those cleaning the foreign matter adhering to the inner surface of the discharge passage by screwing with respect to the valve casing, fitted with a temperature indicator on the outer surface of the valve casing, wherein the temperature indicator, the outer surface of the valve casing and mounted case, the temperature responsive member is accommodated in the casing contracts or extended by the temperature change of the valve casing, the temperature attached to said temperature responsive member Comprising a movable member that is displaced in the axial direction of the casing by shrinkage or elongation reaction member, and a low-temperature display unit which projects the become attached to a predetermined temperature below the one end of the movable member from said casing, said casing A steam trap , wherein the tip is aligned at the same protruding position as the tip of the cleaning member in a state of being screwed back and protruding from the valve casing .

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