JPH0220564Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention is a vacuum steam-type section assembly boiler, in which steam generated in the section under vacuum pressure, that is, a pressure lower than atmospheric pressure, is used to generate heat through a heat exchanger. The present invention relates to a sectional boiler that can effectively bleed non-condensable gas from the upper part of the section when operated to supply heated water supply to other places for purposes such as hot water supply and space heating.

In recent years, canned water in a sealed vacuum steam type hot water boiler is heated under vacuum pressure, that is, at a pressure lower than atmospheric pressure, to generate steam, and this steam heats the feed water via a heat exchanger. Boilers that supply heated water for hot water and space heating are becoming more and more commonly used.

This type of boiler has the advantage of high safety because the pressure inside the can is lower than atmospheric pressure, but on the other hand, non-condensable gases such as air leaking into the can and _H2 gas generated inside the can are generated. If even a small amount of these non-condensable gases accumulates in the can, the heat transfer performance of the heat exchanger will be significantly reduced, resulting in a reduction in the performance of the boiler.

In order to eliminate this drawback, it is sufficient to reduce the non-condensable gas inside the can as much as possible, and for this purpose, the non-condensable gas is sometimes extracted from the inside of the can using a vacuum bleed pump and released to the outside of the can. must be ejected.

A conventional vacuum steam type sectional boiler equipped with such an air extraction device had a structure as shown in the vertical cross-sectional view of FIG. That is, in a can body 1 assembled by sequentially joining n sections 1a, 1b, 1c, . . . horizontally by upper nipple 2 and lower nipple 3, can body 1
A suction pipe 4 is attached to the upper part of the section 1x at approximately the center of the body, and a check valve 5, a solenoid valve 6, and a vacuum bleed pump 7 are installed on the opposite side of the suction pipe 4 from the can body 1.
The solenoid valves 6 were opened and the vacuum bleed pump 7 was driven to bleed out the non-condensable gas in the can. However, in a sectional boiler having such a structure, the steam sections of each section 1a, 1b, 1c, . As a result, the efficiency of air extraction in other sections other than the section where the suction pipe 4 is attached is poor, especially in the section 1x located almost in the center.
In order to completely bleed out the non-condensable gas in the section remote from the vacuum bleed pump 7, the vacuum bleed pump 7 must be operated for a long time, which is uneconomical.

The present invention eliminates such drawbacks and provides a sectional boiler capable of efficiently extracting and discharging non-condensable gas present in the steam section within the boiler.

That is, the present invention is a vacuum steam type sectional boiler that is assembled by joining each section horizontally in sequence, in which a suction pipe connected to a vacuum bleed pump runs through an upper nipple that communicates the steam section of each section. The nipple is inserted through the nipple, leaving a sufficiently large space, and the suction pipe is provided with a number of suction ports for sucking non-condensable gas from the steam section in each section. This article relates to a sectional boiler characterized by:

Hereinafter, embodiments of the sectional boiler according to the present invention will be described in detail with reference to the drawings.

Figure 2 shows one of the sectional boilers according to the present invention.
A vertical cross-sectional view of the embodiment, FIG. 3 is A- in FIG.
4 is an enlarged sectional view of another embodiment of section B in FIG. 2, and FIG. 5 is a sectional view taken along line A.
- It is a C line enlarged sectional view.

In the drawing, 1 represents n sections 1a, 1b, 1
The can body is assembled by horizontally joining the can bodies c, . Upper nipple 2 whose inserted part communicates with the steam section inside the can body 1
As shown in FIG. 2, the suction pipe is installed with a sufficiently large space left inside the upper nipple 2, and each section of the suction pipe 4 inserted into the can body 1 is Inlet 4 for inhaling non-condensable gas from the steam section in 1a, 1b, 1c,...
A is bored as in the embodiment shown in FIG. It is preferable that one to four suction ports 4a are provided in each section of the suction pipe 4, but the suction ports 4a may be provided in each section. . As a means for installing the suction pipe 4 in the can body 1, as shown in FIG.
A method is to fix the flange 4b and bolt it to the can body 1, or a method is to combine threaded joints 4c and 4d as shown in FIG.
Various other methods such as fixing by direct welding can be adopted. 5 is a check valve connected to the side of the suction pipe 4 opposite to the side inserted into the can body 1;
7 is a solenoid valve connected to the suction pipe 4 following the check valve 5, and a vacuum bleed pump 7 is connected to the suction pipe 4 subsequent to the solenoid valve 6. Further, 8 is a heat exchanger inserted into the steam section in each section 1a, 1b, 1c,..., and this heat exchanger 8
The water supplied inside the can body 1 is heated by a steam section inside the can body 1 and is supplied outside the can body 1 for hot water supply or space heating. 9 is a burner, and the combustion gas combusted by this burner 9 is transferred to each section 1a, 1b, 1c,
The can water is heated through the can wall as it passes through the combustion chamber and flue.

In the sectional boiler having such a structure, when the burner 9 is ignited, the combustion gas heats the can water in the can body 1 and generates steam in the steam section.
This steam heats the feed water via the heat exchanger 8. During operation of this sectional boiler, non-condensable gas consisting of leaked air and H ₂ gas generated inside the can accumulates inside the can.
In order to extract and discharge this non-condensable gas, which significantly reduces the heat transfer performance of the heat exchanger 8, to the outside of the can, the vacuum bleed pump 7 is driven and the solenoid valve 6 is opened at regular intervals. be. At this time, the suction pipe 4 is inserted through the upper nipple 2 that communicates the steam part of the can body 1, and the part of the suction pipe 4 inserted into the can body 1 has the steam in each section. Since a large number of suction ports 4a are provided for sucking non-condensable gas in the section, the non-condensable gas accumulated in the steam section of each section is immediately sucked into the suction pipe 4 through the respective suction ports 4a, and a back check is performed. valve 5,
The non-condensable gas is discharged through a solenoid valve 6 and a vacuum bleed pump 7, and since the steam section inside the can body 1 is communicated with the upper nipple 2, the non-condensable gas is taken in and discharged at almost the same pressure. Because of this, only one suction tube is sufficient, making it very economical.

As detailed above, in the sectional boiler according to the present invention, the non-condensable gas in the steam section inside the can is uniformized and extracted from each section.
The driving time of the vacuum bleed pump required to bleed non-condensable gas is significantly shortened, and the operating efficiency can be increased, which has great practical value.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of a conventional sectional boiler, FIG. 2 is a vertical cross-sectional view of an embodiment of the sectional boiler according to the present invention, and FIG. 3 is a vertical cross-sectional view of a conventional sectional boiler.
-A sectional view, FIG. 4 is an enlarged sectional view of another embodiment of section B in FIG. 2, and FIG. 5 is an enlarged sectional view taken along the line C--C in FIG. 2. 1...Can body, 1a, 1b, 1c,..., 1x, 1
n...Section, 2...Upper nipple, 3...
Lower nipple, 4...Suction pipe, 4a...Suction port,
4b...Flange, 4c, 4d...Threaded joint, 5...Check valve, 6...Solenoid valve, 7...Vacuum bleed pump, 8...Heat exchanger, 9...Burner.

Claims (1)

[Claims for Utility Model Registration] 1. A vacuum steam type sectional boiler assembled by sequentially joining each section horizontally, in which a suction pipe 4 connected to a vacuum bleed pump 7 is connected to each section 1a, 1b, 1c, . . . are passed through the upper nipple 2, leaving a sufficiently large space in the upper nipple 2, and the suction pipe 4 has the sections 1a, 1b, . . . 1c, a large number of inlets 4a for inhaling non-condensable gas from the steam section.
A sectional boiler characterized by having a hole. 2 The suction pipe 4 is connected to each section 1a, 1b, 1c,
. . . A sectional boiler according to claim 1 of the utility model registration claim, wherein an inlet port 4a is provided at each of the sections. 3. The sectional boiler according to claim 1 or 2, wherein the suction pipe 4 is inserted into the can body 1 by passing through the upper side of the section at one end.