JP2931228B2 - Silence structure of vacuum boiler - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a silencing structure for a vacuum boiler used for hot water supply and heating.

[0002]

2. Description of the Related Art Conventionally, water for a heat medium is sealed in a can body having an internal pressure equal to or lower than the atmospheric pressure to form a reduced-pressure steam chamber and a water storage chamber for a heat medium, and a burner device for heating the water for the heat medium is heated. It is connected to the combustion chamber provided in the medium water storage chamber, and furthermore, a heat exchanger for extracting heat is arranged in the reduced pressure steam chamber, and the heated fluid is heated by the steam generated in the can body. There is a vacuum type boiler.

[0003]

However, in the above-mentioned vacuum boiler, the boiling state generated when heating medium water is heated to a normal operating temperature by a heating device, or the heat exchanger increases due to a high heat load. In a sudden local boiling state when the degree of vacuum around or the temperature of the can drops, the water for the heat medium violently hits the wall of the can by the action of steam bubbles generated in the water for the heat medium. , A loud noise peculiar to the vacuum boiler was generated.

[0004] The following can be considered as major factors of the noise generated by the heat medium water hitting the wall surface of the can body.

[0005] That is, in the vacuum boiler, when the burner device is activated to start water flow to the heat exchanger, steam bubbles are generated from the surface of the combustion chamber on the heat medium water side, and the steam bubbles are buoyant to the water surface. Rise towards.

[0006] As the pressure of the rising steam bubbles rises, it approaches the pressure of the reduced-pressure steam chamber (the pressure decreases).
The volume will be accompanied by a sudden expansion.

[0007] A part of the grown vapor bubble is deprived of heat at a locally low temperature part and contracts rapidly. This local cold part
The condensed water deprived of heat in the reduced-pressure steam chamber is returned to the heat medium water storage chamber, and is generated at a low temperature by the condensed water.

Therefore, a phenomenon in which the water for the heat medium flows into the volume portion where the steam bubbles have shrunk occurs everywhere in the water storage chamber for the heat medium, whereby the water for the heat medium violently swings, and a shock wave is generated by the water hammer phenomenon. The side of the can was beaten violently, and a loud noise was generated from the can, producing noise.

For the above-mentioned reasons, when using a vacuum boiler, it is necessary to consider the noise around the boiler, and to limit the boiler heating start time and do not give a sudden load change. Measures such as control are required, and the restriction on boiler operation is increased.

[0010] An object of the present invention is to provide a silencing structure for a vacuum boiler which can solve the above-mentioned problems.

[0011]

SUMMARY OF THE INVENTION According to the present invention, a heat medium water is sealed in a can body having an internal pressure equal to or lower than the atmospheric pressure to form a heat medium water storage chamber and a reduced-pressure steam chamber. A heating means for heating the heating medium water is provided in the chamber, and a heat exchanger for extracting heat is provided in the reduced-pressure steam chamber so that the fluid to be heated is heated by steam generated in the can body. In the vacuum boiler configured as described above, a shielding plate formed in a U-shape in cross section is interposed between the heating means and the side wall of the can body to surround the left, right, and bottom sides of the heating means. The present invention relates to a silencing structure for a vacuum boiler, wherein a shielding plate and the side wall are not connected to each other to prevent a shock wave of heat medium water due to boiling from directly colliding with a side wall of a can body.

The present invention also has the following features.

(A) The upper end of the shielding plate is located below the surface of the heat medium water.

(B) A sound absorbing material is provided between the shielding plate and the side wall of the can body.

With the above configuration, it is possible to prevent the noise peculiar to the vacuum boiler.

[0016]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is an explanatory view showing a silencing mechanism of a vacuum boiler according to the present invention, FIG. 2 is an explanatory view of the vacuum boiler as viewed from the rear, FIG. 3 is an explanatory view as viewed from the side, and FIG. FIG.

As shown in FIGS. 2 to 4, the vacuum boiler A according to the present invention forms a horizontal type can 1 having a curved top portion 1a and bottom portion 1b (see FIG. 3). Inside the can 1, a water storage chamber 11 for heat medium and a reduced-pressure steam chamber 12 are formed. 1c, 1
d is the left and right side walls of the can 1, and 1e and 1f are the front and rear walls of the can 1.

As shown in FIG. 1, the heating medium water 10 is sealed in a heating medium water storage chamber 11 having an internal pressure equal to or lower than the atmospheric pressure, and a heating means 2 for heating the heating medium water 10 is provided. Further, a heat exchanger 3 for extracting heat is provided in the reduced-pressure steam chamber 12. 32 and 33 are heat exchanger mounting parts.

As shown in FIG. 3, the heating means 2 is connected to the combustion chamber via a combustion chamber head 25 attached to the front wall 1e of the can body 1.
A fan burner 22 attached to the front wall 1e is connected to the combustion chamber 21 so that the fuel medium water 10 can be heated by burning heavy oil, gas or the like serving as fuel in the combustion chamber 21.

1 to 4, reference numeral 4 denotes a water storage chamber for a heat medium.
A number of smoke tubes arranged in the inside of the can 11 are arranged in parallel in the longitudinal direction of the can 1 so as to be located above the heating means 2. Reference numeral 4a denotes a smoke channel forming portion, and the flame in the combustion chamber 21 is discharged from the smoke tube 4 to the outside through the smoke channel forming portion 4a.

The heat exchanger 3 is composed of a heat absorbing pipe 31 disposed in the reduced-pressure steam chamber 12 so that water to be heated can pass through the pipe 31 and the pipe 31 communicates with the load 7. Let me.

Then, the heated water is circulated between the heat exchanger 3 and the load 7 by a pump (not shown), and the heated water is heated by the steam of the heated heat medium water 10 generated in the can 1. It is configured to be.

That is, when the heat medium water 10 is heated by the heating means 2, the heat medium water 10 boils, a number of vapor bubbles 6 are generated near the surface of the heating means 2, and eventually grow and rise,
The steam is filled in the reduced-pressure steam chamber 12, and the steam to be heated in the heat absorbing pipe 31 of the heat exchanger 3 is heated by the steam. The steam deprived of heat by heat exchange becomes condensed water and returns to the heat medium water 10.

In the vacuum boiler A having the above-described structure, the gist of the present invention is that a shielding plate 5 is provided in the can 1 and a shock wave of the heating medium water 10 due to boiling is applied to a side wall of the can 1. Direct collision is prevented, and noise generated from the can 1 is suppressed as much as possible.

As shown in FIGS. 1 and 4, the shielding plate 5 in this embodiment is formed in a U-shape in cross section, and is provided between the heating means 2 and the inner wall surfaces of the left and right side walls 1c and 1d of the can body 1. The shielding plate 5 surrounds the left and right sides and the bottom side of the heating means 2 and is separately and independently attached to the left and right side walls 1c and 1d in a non-connected state.

That is, the front side of the shield plate 5 is placed on the end plate 25 of the combustion chamber.
In addition, the rear side is welded to the rear wall 1f of the can 1, and the rear side is welded via the spacer 23, so that the shielding plate 5 and the left and right side walls 1c, 1d of the can 1 are not connected.

Further, the upper end 5a of the shielding plate 5 is
Is positioned below the water surface so that it does not protrude above the water surface.

As a result of an experiment in which the mounting state of the shielding plate 5 was changed in various ways, it was found that at least the noise reduction effect was higher when the upper end 5a was located below the water surface than when it was projected above the water surface. This is because the.

Here, the silencing mechanism of the vacuum boiler A according to the present embodiment having the above configuration will be described below with reference to FIG.

The vapor bubbles 6 generated in the heat medium water 10 gradually grow and rise to the liquid level.

On the other hand, the steam filled in the reduced-pressure steam chamber 12 is subjected to heat exchange by the heat exchanger 3 to become low-temperature condensed water and falls into the heat medium water storage chamber 11. A low temperature part is formed.

The vapor bubble 6 in the growth process that has come into contact with the low-temperature portion is deprived of heat and condenses rapidly, as shown by the arrow g.
The heat medium water 10 flows into the condensed and disappeared volume.

When such a phenomenon occurs everywhere in the heat medium water 10, the heat medium water 10 largely swings to cause a water hammer phenomenon, and the shock wave propagates in all directions.

However, since the shielding plate 5 is provided as described above, the shock wave hits the shielding plate 5 and the impact energy is absorbed.

Further, since the heat medium water 10 interposed between the shielding plate 5 and the left and right side walls 1c and 1d functions as a damper, the vibration of the shock wave transmitted to the left and right side walls 1c and 1d of the can 1 is greatly reduced. You.

The shielding plate 5 is provided on the left and right side walls 1c, 1d of the can body 1.
Therefore, the vibration of the shielding plate 5 due to the shock wave is not directly transmitted to the left and right side walls 1c and 1d.

Accordingly, the sound of hitting the can 1 is suppressed as much as possible, and a quiet boiler operation becomes possible.

Further, since the can 1 has a double wall structure by the shielding plate 5, the sound of boiling inside the can 1 and the sound of condensation of the vapor bubbles 6 are hardly leaked to the outside, so that the sound deadening effect is further enhanced. be able to.

As described above, the noise reduction structure according to the present invention is a low-cost and simple structure, but can greatly reduce the unique noise caused by the steam generation of the vacuum boiler.

As another embodiment, as shown in FIG. 5, a sound absorbing material 8 can be provided between the shielding plate 5 and the left and right side walls 1c and 1d of the can body. Glass wool or the like can be used as the sound absorbing material 8.

In this embodiment, the sound absorbing material 8 is disposed so as to be sandwiched between the shielding plate 5 and the left and right side walls 1c and 1d.

By arranging the sound absorbing material 8 as described above, the noise reduction effect can be further improved, and a quieter boiler operation can be performed.

[0044]

According to the present invention, the heat medium water is sealed in a can body having an internal pressure equal to or lower than the atmospheric pressure to form a heat medium water storage chamber and a reduced-pressure steam chamber, and the heat medium water is heated in the heat medium water storage chamber. Arrange heating means to
Further, in a vacuum boiler in which a heat exchanger for extracting heat is arranged in a reduced-pressure steam chamber and a fluid to be heated is heated by steam generated in the can, a shielding plate is arranged in the can. By preventing the shock wave of the heat transfer water due to boiling from directly colliding with the side wall of the can body, it is possible to prevent the loud noise peculiar to the vacuum boiler, and to limit the boiler heating start time, It is not necessary to take any measures such as control so as not to cause a sudden load change, and the operation efficiency can be improved without being restricted by the boiler operation. In addition, the structure is simple and noise can be prevented at low cost.

The shielding plate is formed in a U-shape in cross section, and is interposed between the heating means and the side wall of the can to surround the left, right and bottom sides of the heating means. By being disconnected from the side wall, a shock wave due to the water hammer phenomenon hits the shielding plate, and the shielding plate absorbs impact energy.

Moreover, since the heat medium water interposed between the shielding plate and the side wall of the can functions as a damper, the shock wave is greatly reduced, and the vibration of the shielding plate due to the shock wave is directly transmitted to the side wall. Noise can be suppressed without transmission.

Since the upper end of the shielding plate is located below the surface of the heat medium water, the sound deadening effect can be improved.

By disposing the sound absorbing material between the shielding plate and the side wall of the can body, the sound deadening effect can be further improved.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a silencing mechanism of a vacuum boiler according to the present invention.

FIG. 2 is an explanatory diagram viewed from the rear.

FIG. 3 is an explanatory view as viewed from the side.

FIG. 4 is a schematic explanatory view of the same.

FIG. 5 is an explanatory diagram of a vacuum boiler according to another embodiment.

[Explanation of symbols]

 A Vacuum boiler 1 Can 2 Heating means 3 Heat exchanger 5 Shield 5a Upper end 8 Sound absorbing material 10 Water for heat medium 11 Water storage room for heat medium 12 Decompression steam chamber

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F22B 3/04

Claims (3)

(57) [Claims] 1. A heating medium water (10) is sealed in a can (1) having an internal pressure equal to or lower than the atmospheric pressure, and a heating medium water storage chamber (11) and a reduced pressure steam chamber
(12), a heating means (2) for heating the heat medium water (10) is provided in the heat medium water storage chamber (11), and a heat exchanger (3) for extracting heat is provided. ) Is disposed in the reduced-pressure steam chamber (12), and the heating plate is heated by the steam generated in the can body (1). (5) the heating means
(2) and the side wall of the can (1).
Surround the left, right and bottom sides, and furthermore, the shielding plate (5) and said side
A silencing structure for a vacuum boiler, wherein a shock wave of the heating medium water (10) due to boiling is prevented from directly colliding with a side wall of a can body (1) by disconnecting the wall from the wall . 2. An upper end (5a) of the shielding plate (5) is heated with water for a heat medium.
2. The silencing structure of a vacuum boiler according to claim 1, wherein the silencing structure is located below the water surface . 3. Between the shielding plate (5) and a side wall of the can (1).
The sound absorbing structure according to claim 1 or 2 , further comprising a sound absorbing material (8) .