JP5065327B2 - Steam trap insulation cover - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat insulation cover rich in versatility installable in several kinds of steam traps different in an outer diameter of a cover body. <P>SOLUTION: This cap type heat insulation cover 1 crowns so as to form an air layer outside a cover body which internally installs a driving part for operating a valve element provided in the steam trap, and is provided with a clip 7 for diametrically freely expanding and contracting by suspending a plurality of band plate pieces 8, 8a, etc. at an equal interval on the circumference set in a ceiling 1a inside the cover 1 so as to be elastically energized in the centripetal direction. In the band plate pieces 8, 8a, etc., a plurality of steps 9 and 9a fixed to the upper edge of the respective covers by elastically expansively opening so as to correspond onto the same circumference as the respective outer diameters of a plurality of cover bodies different in the outer diameter, are bent and formed in a stair shape from a height position at a predetermined interval from the ceiling 1a. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a heat insulating cover for a steam trap that automatically discharges condensate generated in a steam piping system.

For example, various types of steam traps such as a disk type disclosed in Patent Document 1 and a thermally responsive type disclosed in Patent Documents 2 and 3 can be seen.
The disc type steam trap connects the inlet opened on one side of the valve box and the jet port opened in the center of the horizontal upper end surface of the valve box through the primary flow path, and opens on the other side of the valve box. And a discharge port opened in an annular groove that is recessed in the upper end surface around the jet port through a secondary flow path, and a disc-shaped valve that can simultaneously open and close the jet port and the annular groove on the upper end surface The valve body is formed by covering the upper part of the valve box with a lid formed inside the valve body as a valve chamber, and the heat release from the valve chamber (lid body). The valve body is opened and closed based on the condensation of steam.
The heat-actuated steam trap is connected to the inlet opened on one side of the valve box and the jet outlet opened on the upper end surface of the valve box through the primary channel, and the outlet opened on the other side of the valve box The valve port opened at the center of the end face is communicated by a secondary side flow path, and a valve body that opens and closes the valve port is provided in a heat expansion / contraction body such as a diaphragm or a bellows in which a heat medium is enclosed. The valve body is opened and closed by a thermal expansion / contraction body that is formed by covering the upper part of the valve box with a lid formed inside the expansion / contraction body as a valve chamber and expanding and contracting due to the temperature change of steam and condensate. .

Both types of steam traps are equipped with a lid (valve chamber) that covers the top of the valve box with a drive unit that activates the valve body, so the atmospheric temperature that changes depending on the climate affects the steam temperature inside the lid body. In winter, rainy weather, and snowy weather, the valve is frequently opened and high-temperature condensate is discharged. In summer, the valve opening is delayed and a large amount of condensate is accumulated upstream.
Therefore, in order to solve the above problem, in the steam trap disclosed in Patent Document 4, a heat insulating cover that forms an air layer is put on the outer side of the lid body, and the valve chamber is secondary in the atmosphere via the air layer. Cooling is performed so that the drive unit is not directly affected by the atmospheric temperature.

No. 7-25516 Japanese Examined Patent Publication No. 6-68352 JP 2005-273740 A Japanese Patent No. 2711607

However, the above heat insulation cover is merely a cap that is externally fitted to the outer periphery of the upper part of the valve box to which the lid is screwed, and a separate heat insulation cover must be prepared for steam traps having different outer diameters. Lack of sex.
In view of the above, an object of the present invention is to provide a versatile heat insulating cover that can be attached to several types of steam traps having different lid outer diameters.

In view of the above problems, the heat insulating cover of the steam trap according to the present invention is a cap type that is crowned so as to form an air layer on the outer side of a lid body that has a drive unit that operates a valve body provided in the steam trap. A clip that is formed and can be freely expanded and contracted by suspending a plurality of strip pieces elastically in the centripetal direction at equal intervals on the circumference set on the ceiling inside the heat insulation cover The band plate piece is elastically expanded so as to correspond to the same circumference as the outer diameters of the plurality of lid bodies having different outer diameters, and is hooked on the upper edge of each lid body. A plurality of step portions are bent and formed in a step shape from a height position separated from the ceiling portion by a predetermined interval.
Further, a claw piece that can be hooked at an appropriate position of each lid body may be bent at the lower end of the strip piece.

In short, since the present invention is configured as described above, the strip piece in the clip is elastically expanded in the radial direction, and the step portion of the strip piece corresponding to the outer diameter of the lid body to be crowned is the upper end of the lid body. By hooking on the edge, one heat insulating cover can be crowned on each of a plurality of lids having different outer diameters.
In addition, the step of the strip piece is hooked to the upper edge of the lid body, so that the space between the ceiling portion of the thermal insulation cover and the upper surface of the lid body is reliably and stably maintained, and the air between the lid body and the thermal insulation cover is maintained. A layer can be secured.

  In addition, it is practically effective because the clip can be held more firmly by hooking the claw piece bent at the lower end of the strip piece in place on each lid. It ’s big.

It is a bottom view of a heat insulation cover. It is AA sectional drawing of FIG. It is sectional drawing of the steam trap which shows one usage example of a heat retention cover. It is sectional drawing of the steam trap which shows the other usage example of a heat retention cover.

An embodiment of the present invention will be described below with reference to the drawings.
The heat insulating cover 1 according to the present invention can be attached to a plurality of steam traps 3 and 3a having different outer diameters of cylindrical lids 2 and 2a, and a valve body 4 provided to the steam traps 3 and 3a. , 4a is formed in a cap shape to be crowned so as to form an air layer 6, 6a on the outer side of the lid body 2, 2a having a drive unit 5, 5a for operating.

Further, the ceiling portion 1a inside the heat insulating cover 1 is provided with a clip 7 having an expandable / contractable diameter that elastically holds a plurality of lid bodies 2 and 2a having different outer diameters.
The clip 7 has a circle (shown by a two-dot chain line in FIG. 1) that is concentric with the ceiling 1a and has an appropriate diameter, and is made of a plurality of thin leaf springs at equal intervals on the circumference. Are vertically suspended so as to be elastically urged in the centripetal direction.

The band strips 8 and 8a are elastically expanded so as to correspond to the same circumference as the outer diameters of the lids 2 and 2a and are hooked on the upper edges of the lids 2 and 2a, respectively. The plurality of stepped portions 9 and 9a are bent and formed in a step shape from a height position spaced apart from the ceiling portion 1a by a predetermined distance.
Further, claw pieces 10, 10 a... That can be hooked at appropriate positions on the lid 2, 2 a are bent at the lower ends of the strip pieces 8, 8 a. When the hook 2 cannot be hooked on the lower end of the lid 2 as shown in FIG. 4, an annular groove 11 on which the claw pieces 10, 10a. It is more desirable to do.
In the strip pieces 8, 8a, the step portions 9, 9a are bent so as to be elastically urged in the centripetal direction, so that, as shown in FIG. By tilting with β, the gripping force of the clip 7 with respect to the lid bodies 2 and 2a is adjusted by changing the tilt angle.

In this embodiment, the steam traps 3 and 3a are thermodynamic trap disk types, and the structures of the steam traps 3 and 3a are the same but different in size.
The steam traps 3 and 3a are connected to the inlets 13 and 13a opened on one side of the valve casings 12 and 12a and the outlets 14 and 14a opened in the center of the horizontal upper end surface of the valve casings 12 and 12a. Communicating through the passages 15 and 15a, the outlets 16 and 16a are opened on the other side of the valve boxes 12 and 12a, and the annular grooves 17 and 17a are formed in the upper end surface so as to be recessed with the outlets 14 and 14a as the center. The outlets 18 and 18a formed are communicated with each other through the secondary flow paths 19 and 19a.

  Further, the jet ports 14 and 14a and the annular grooves 17 and 17a can be simultaneously opened and closed on the upper end surface, and the disc-shaped valve bodies 4 and 4a having a slightly larger diameter than the upper end surfaces of the valve boxes 12 and 12a can be attached and detached. In addition, the upper part of the valve box 12, 12a is crowned by the lid 2, 2a formed inside as the pressure chamber 20, 20a with the accommodating space of the valve body 4, 4a as the pressure chamber 20, 20a. The lids 2 and 2a are provided as drive units 5 and 5a for opening and closing the valve bodies 4 and 4a based on the condensation of steam in the pressure chambers 20 and 20a due to heat radiation.

In the pressure chambers 20 and 20a, the inner peripheral wall of the lids 2 and 2a is formed by forming an annular space between the upper outer peripheral wall of the valve box 12 and 12a, and the lower end of the outer peripheral wall is gradually lowered downward. It is formed in a tapered shape (hereinafter referred to as tapered surfaces 21 and 21a) that expands in diameter.
On the tapered surfaces 21 and 21a, bimetal rings 22 and 22a whose diameters are expanded and contracted by temperature sensing are arranged, and the upper portions of the valve boxes 12 and 12a are loosely inserted into the upper ends of the bimetal rings 22 and 22a. Flat rings 23 and 23a for supporting the lower end periphery so as to be freely contacted and separated are placed.
Reference numerals 24 and 24a shown in the figure are strainers.

  In this embodiment, the steam traps 3 and 3a to which the heat insulating cover 1 is attached are shown as disk type. However, if the steam trap is provided with a cover body with a drive unit for operating the valve body, The heat insulating cover 1 according to the present invention can also be applied to types of thermodynamic traps and thermostatic traps (thermally responsive steam traps disclosed in Patent Documents 2 and 3).

Next, mounting of the heat insulating cover 1 on the steam traps 3 and 3a will be described with reference to FIGS.
In order to cover the cover 2 and 2a with the heat insulating cover 1, the cover 2 and 2a are arranged so that the lower end sides of the strip pieces 8 and 8a. Are pressed against the tips of the claw pieces 10, 10 a... And the heat insulating cover 1 is pushed down while the claw pieces 10, 10 a.

Then, in the lid body 2 whose outer diameter corresponds to the small-diameter step portion 9, the upper end edge thereof is hooked on the upper step portion 9, and the claw pieces 10, 10 a are hooked on the lower end portion of the lid body 2. Stop (see FIG. 3).
Further, in the lid body 2a whose outer diameter corresponds to the large-diameter step portion 9a, the upper end edge thereof is hooked on the lower step portion 9a, and the claw pieces 10, 10a, ... are annular grooves of the lid body 2a. 11 (see FIG. 4).

The heat insulating cover 1 attached to the lids 2 and 2a is formed in a cap shape larger than the lids 2 and 2a, and the step portions 9 and 9a are hooked on the upper edges of the lids 2 and 2a. By doing so, a predetermined interval is securely held between the upper end surfaces of the lid bodies 2 and 2a and the ceiling portion 1a, and air layers 6 and 6a are secured between the lid bodies 2 and 2a and the heat insulating cover 1. .
As a result, the pressure chambers 20 and 20a are secondarily cooled in the atmosphere through the air layers 6 and 6a so that the drive unit 5 is not directly affected by the atmospheric temperature, and the valve bodies 4 and 4a are normally opened and closed. Let me speak.

1 Thermal insulation cover
1a Ceiling part 2, 2a Lid 3, 3a Steam trap 4, 4a Valve body 5, 5a Drive part 6, 6a Air layer 7 Clip 8, 8a ... Strip piece 9, 9a Step part
10, 10a ... Nail pieces

Claims (2)

  A cap-type heat insulation cover that is crowned so as to form an air layer outside a lid body that operates a valve body that operates a valve body provided for a steam trap, and is a circle set on a ceiling portion inside the cover Provided with a clip that allows multiple strip strips to be elastically urged in the centripetal direction at regular intervals on the circumference, making the diameter of the strip strip freely adjustable. The plurality of stepped portions that are elastically expanded so as to correspond to the same circumference as the respective outer diameters of the plurality of lids and are hooked on the upper edge of each lid are separated from the ceiling by a predetermined interval. A heat insulating cover for steam traps, which is bent from a height to form a staircase.   The heat retaining cover for a steam trap according to claim 1, wherein a claw piece that can be hooked at an appropriate position of each lid is bent at the lower end of the strip piece.

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