JPS6243199Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a steam trap for automatically discharging condensate from a steam system, and particularly relates to the structure of a heat insulating portion covering the steam trap.

Recently, there has been a growing trend towards energy conservation, and steam traps have been covered with exterior materials to prevent loss of steam heat due to heat radiation.

Prior Art An example of this is shown in Japanese Utility Model Publication No. 12480/1980. This is a system in which a heat insulating space is provided between the trap casing and the outer periphery of the trap casing is covered, and the piping connection port of the trap casing and the exterior material are mechanically connected. be.

Problems to be Solved by the Present Invention The above-mentioned problem has a poor heat retention effect. In other words, heat transfer due to air convection between the exterior material and trap casing is large, and
Since the exterior material is mechanically aligned and joined to the trap casing, there is a gap at the joint, allowing gas to enter and exit and water to enter. This is because the inflow and outflow of gas increases heat dissipation, and especially when water enters the space, it evaporates within the space and escapes from the space, further increasing heat dissipation.

The technical problem of the present invention is to eliminate convection and fluid flow in and out of the space between the exterior material and the trub casing.

Means for Solving the Problems The technical means of the present invention taken to solve the above technical problems is to weld or braze a sheathing material covering the entire outer circumference of the trap casing to the steam trap. installed to form a space between the outer surface of the trap casing and the inner wall surface of the exterior material,
It is something that creates a vacuum in space.

Effect The operation of the above technical means is as follows.

Since the space between the trap casing and the exterior material is evacuated and sealed, there is no flow of fluid between the inside and outside of the space, and only heat transfer occurs within the space due to radiation. Since heat transfer by radiation is extremely small compared to conduction and convection, the loss of steam heat from the trap can be reduced.

The parts that come into contact with the trap casing are at high temperatures, so the material used for the sealing must be heat resistant, but since it is welded or brazed, it is heat resistant and does not create any voids, ensuring a vacuum inside the space. can be kept. .

Example Example (first example) showing a specific example of the above technical means
(see figure).

Reference numeral 1 indicates the outer shape of the steam trap, and the pipe connection ports 2 and 3 form a trap casing.
The exterior members 4 and 5 are the pipe connection ports 2 and 3 of the trap.
It is made by dividing into left and right halves, with a shape that covers the entire outer surface of trap 1, leaving behind. The exterior members 4 and 5 are fitted into the stepped portions of the pipe connection ports 2 and 3 and welded (reference numbers 6 and 7) to the Trutub casing, and the central opening of the exterior members 4 and 5 is closed around the entire circumference. A space 9 is formed between the inner wall surfaces of the sheathing members 4 and 5 and the outer surface of the truck 1 by welding (at the point indicated by reference number 8). A hole is made in the exterior material 5, and the check valve 15 is welded (at the location indicated by reference number 12) and attached. Check valve 15
It consists of a valve port 14, a tapered valve seat 10, and a ball valve 11 that is seated on and off the valve seat 10 to open and close the valve port 14.
A vacuum pump (not shown) is connected to the check valve 15 to evacuate the space 9, and then a plug 13 is attached and sealed.

Another example illustrating a specific example of the above technical means will be described.

The trap 1 and exterior members 4 and 5 are placed in a container, and the inside of the container is evacuated. In this container, the trap 1 is covered with exterior materials 4, 5 and reference numbers 6, 7, 8 are placed.
The space 9 is evacuated by welding the parts. In this case, the check valve 15 and the plug 13 are not required, there is no vacuum breakage due to a defective check valve 15, and the welded surface is neatly finished and looks good.

Effect of invention The present invention produces the following specific effects.

In the case of placing an insulating material such as ceramic fiber between the trap casing and the exterior material, the insulating material is expensive and the material cost increases, but in this invention, insulation is achieved by creating a vacuum, so the expensive No insulation is required, reducing costs.

If there is a gap between the trap casing and the exterior material, water will enter and the insulation will deteriorate.
In the present invention, it is completely sealed by welding, etc., so there is no water intrusion, and the initial good heat retention effect lasts for a long time.

Since a vacuum is created between the trap casing and the exterior material without any heat insulating material, the overall shape of the trap with the heat insulating cover attached can be made smaller.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a heat insulating cover for a steam trap according to the present invention. 1: Steam trap, 4, 5: Exterior material, 6,
7, 8: Welded part, 9: Space, 15: Check valve.

Claims (1)

[Scope of utility model registration request] A sheathing material that covers the entire outer circumference of the trap casing is attached to the steam trap by welding or brazing to form a space between the outer surface of the trap casing and the inner wall surface of the sheathing material, and a vacuum is created in the space. Steam trap thermal cover.