JPS6042618A - Liquid level detector of fluid heating device - Google Patents

Abstract

PURPOSE:To suppress the influence of a flow of the liquid in a flush tank upon a float part and suppress fluctuations of the liquid level by providing a cylinder body which covers the outer circumference of the float part, and opening the lower end of the cylinder body in the reseved liquid in the flush tank and opening the upper part in the space part of the upper-layer part. CONSTITUTION:A float 73 is provided to fit slidably around a rod part 72 extended from the internal ceiling wall of the flush tank 6 nearly perpendicularly, and a liquid level detection signal is generated corresponding to the position of the float 73 based upon a specific liquid level. Then, the cylinder body 31 is provided to cover the float 73 at an internal to the outer circumference of the float 73, and the opening parts are formed at positions above and below the liquid level 13 of the cylinder body 31. Consequently, even if the reserved water in the flush tank 6 flows owing to circulation, the flow of the reserved water in the cylinder body 31 is suppressed by the cylinder body 31, and the reserved water at the float part 73 is straightened, preventing chattering due to the flow.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to an improvement in a liquid level detection device disposed in a distern tank of a fluid heating device. □〈Prior art〉 Generally, this type of fluid heating device includes a combustor and a heat exchanger within the device body, and circulates the heated fluid through a system turn tank using a circulation pump.

For example, a structure as shown in FIG. 1 is used to forcibly supply the heat to the radiator.

In the figure, 1 is a casing of the main body of the device, 2 is a combustion chamber in which a combustor 3 and a heat exchanger 4 are arranged above it, 5 is a circulation pump, and 6 is a casing equipped with a liquid level detection device T. In the stern tank, the stern tank 6, the circulation pump 5, and the heat exchanger 4d1 are each connected to a radiator outside the casing 1 (not shown) through a circulation pipe. That is, a return pipe 8 that connects the radiator and the heat exchanger 4, a connecting pipe 9 that connects the heat exchanger 4 and the distern tank 6, and a distern tank 6 and the circulation pump 5 are connected. Connect 10
1 connecting the connecting pipe, the circulation pump 5 and the front carved radiator.
A fluid to be heated, such as water, flows through the first outgoing pipe and the second circulating pipe. In addition, 12 is the return pipe 8
13 is a water level of water stored in the distern tank 6, and 6a is a water supply port of the distern tank 6.

Furthermore, the liquid level detection device T will be described in detail based on FIG. The main body of the device 7 is the distern tank 6.
A connecting shaft 71 is attached and fixed to the ceiling wall and extends substantially vertically downward so as to face the stored water from the ceiling wall, and a connecting shaft 71 is formed thinner than the connecting shaft 71.
A shaft 72 extends further vertically downward from the tip of the float T3, which is fitted into the shirt T3 so as to be freely movable up and down, and a shaft T3 to prevent the float T3 from being attached or detached from the shirt T3. It consists of 74 stoppers.

A fluid heating device having such a configuration includes a di-stern tank 6.
When the liquid level detection device 7 detects that the water level 13 of the stored water in the tank is higher than a predetermined value based on a water level detection signal via a float 73 that moves up and down according to the water level 13,
The combustor 3 operates, the circulation pump 5 operates, and the water heated by the combustor 3 in the heat exchanger 4 is forced to circulate, and is supplied to a radiator (not shown) outside the casing 1 via the pipe 11.
The water is again supplied to the heat exchanger 4 via the return pipe 8 and circulated while heating the water.

By the way, in such a conventional liquid level detection device 1, water circulating through two connecting pipes 9.10 facing the outlet and inlet of the distern tank 6 is used to detect the water stored in the distern tank 6. This causes water to flow in the direction of the arrow (white blank) shown in Figure 2.

When this water flow is larger than the buoyancy of the float 73,
Chattering occurs even within the set water level, and at the same time chattering also occurs in the circulation pump 5.

Therefore, there is a problem that the heating control in the combustor 3 or the hot water supply control to the radiator is not stable.

In addition, the heated hot water is supplied to the water supply port 6 of the distillation tank 6.
Natural evaporation occurs from a, and as a result, the water level 13 of the stored water decreases with the passage of operating time. At this time as well, especially when the float 13 reaches near a predetermined water level position, chattering occurs due to fluctuations in the water level, resulting in a problem that heating control or hot water supply control is not stable.
As shown in □, conventionally chattering occurs due to the water flow of the stored water or due to a drop in the water level of the stored water. There are various drawbacks such as decreased stability and abnormal heating of the hot water in the heat exchanger 4.
The reliability as a single fluid heating device was poor.

<Summary of the Invention> The present invention has been made by paying attention to the above-mentioned circumstances. The lower part is opened into the stored liquid in the tank, and the upper part is opened into the space in the upper layer of the distern tank, which suppresses the influence of the water flow of the stored liquid on the float part and prevents vertical fluctuations in the liquid level of the stored liquid. This is an attempt to eliminate the above-mentioned conventional drawbacks by suppressing the swinging of the float section due to

<Embodiments of the Invention> Hereinafter, embodiments of the present invention will be described in detail based on FIGS. 3 to 5. Note that the same reference numerals are given to the same components as in the conventional example to simplify the explanation.

In FIG. 3 showing one embodiment, 31 is a liquid level detection device T.
It is a cylindrical body that covers the part facing into the distern tank 6, and the part of the cylindrical body 31 located below the liquid surface is used as an opening 32 that communicates with the stored liquid in the distern tank 6. , and 3 as an opening that communicates the portion of the cylindrical body 31 located above the liquid level with the space in the upper layer inside the distern tank 6.
3 is formed by opening a through hole, and a float 7 is formed.
The float T3 is formed with an inner diameter that is υ larger than the outer diameter of the float T3, and has a gap with the outer circumference of the float T3.

Further, 34 is a holding plate as a tilt prevention member attached to the outer periphery of the connecting shaft 71 in order to prevent the cylindrical body 31 from tilting, and as shown in FIG. The plate material is clamped around the connecting shaft 71 and fixed by screws, and both ends are formed to have a length with a slight clearance from the inner circumferential wall of the cylindrical body 31.

According to this configuration, even if the water flow caused by water circulation occurs in the stored water in the distern tank 6, the flow of the stored water located in the cylindrical body 31 is suppressed by the cylindrical body 31, Since the water stored in the float 73 is rectified, chattering that conventionally occurs due to this water flow can be prevented, and heating control in the combustor 3 and hot water supply control to the radiator can be stably performed.

At this time, since the cylindrical body 31 of this embodiment has a through hole 33 that communicates with the space above the liquid level in the distern tank 6, the water level inside and outside of the cylindrical body 31 can be adjusted. Almost the same
The liquid level detection device T can be maintained at the same level and has high reliability.

Further, in this embodiment, the holding plate 34 is disposed inside the cylindrical body 31, and the end of the holding plate 34 comes into contact with the inner wall of the cylindrical body 31 as soon as the cylindrical body 31 is tilted. Therefore, the cylindrical body 31 is difficult to tilt, and therefore the inner wall of the cylindrical body 31 and the outer circumferential wall of the float 73 often come into contact with each other.
water level detection can be performed more accurately.

FIG. 4 shows another embodiment.

In this device, a cylindrical body 31 substantially similar to that of the first embodiment is placed over the liquid level detection device 7, and a holding member 44 (tilt prevention Element)
is attached to the outer periphery of the connecting shirt 71, especially the cylindrical body 31.
This reliably prevents the liquid level from tilting, and further improves the stability of liquid level detection using the flow 73.

Further, FIG. 5 shows a different embodiment.

51 is a cylindrical body with a through hole 5 in the part located above the liquid level.
2 is opened in the same way as in the above embodiment, but the opening in the part located below the liquid surface communicating with the stored liquid is covered with a shielding plate 54 in which a communication hole 53 is opened. In addition, ring-shaped retaining plates 55 for preventing the cylindrical body 51 from tilting are provided in contact with the outer periphery of the connecting shaft 71 and the inner periphery of the cylindrical body 51, respectively, and a plurality of retaining plates 55 through which stored water or air flows are provided. A communication hole 56 is opened. With this configuration, substantially the same effects as those of each of the above-mentioned embodiments can be obtained.

<Effects of the Invention> As explained above, according to the present invention, the chattering caused by the swing of the float of the liquid level detection device due to the liquid flow of the stored liquid in the distillation tank or the fluctuation of the liquid level of the stored liquid can be suppressed. Since the structure is suppressed by providing a cylindrical body that covers the float, heating control in the combustor or hot water supply control by the circulation pump can be performed with high stability, and abnormal heating in the heat exchanger can be prevented. I can do it, etc.
A fluid heating device equipped with a highly reliable liquid level sensing device can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing an example of a fluid heating device, Fig. 2 is a block diagram showing a conventional example of a liquid level detecting device, and Fig. 3 is a block diagram showing an example of a liquid level detecting device according to the present invention. The configuration diagram, FIG. 3(B) is a perspective view of the main part of the same figure (A), FIG. 4(A) is a configuration diagram showing a different embodiment of the same device, and FIG. 4(B) is the same diagram ( A) is a perspective view of the main part, and FIG. 5 is a configuration diagram showing still another embodiment of the same device. 3... Combustor 4... Heat exchanger 5... Circulation pump 6...-di-stern tank 7... Liquid level detection device 31.51... Cylindrical body 32... Opening 33 .5
2... Through hole 34.55... Retaining plate 44... Holding member 53... Distribution hole 56... Distribution hole 71.
...Connection shaft 72...Shaft 73...Float agent Masuo Oiwa (and 2 others) JP-A-Sho GO-42618 (4)

Claims (1)

[Claims] (11) When a liquid level detection device installed in a distern tank for liquid storage detects that a predetermined amount or more of liquid has been stored in the distern tank, the combustor is operated and the heat exchanger is activated. In the fluid heating device, the liquid level detection device is installed approximately vertically downward from the top wall of the distern tank in a fluid heating device that heats a liquid through a circulation pump and forcibly circulates the liquid and supplies the liquid to a radiator. The float is provided with a float that is slidably inserted into a rod-shaped portion extending from the outside, and is configured to generate a liquid level detection signal according to the position of the float based on a predetermined liquid level, while having a gap with the outer periphery of the float. A cylindrical body is provided to cover the float, and a part of the cylindrical body located above the liquid surface and a part located below the liquid surface have steep openings, respectively. Liquid level detection device for the device. (2) The liquid level detection device for the fluid heating device according to claim 1, wherein the rod-shaped body has a tilt prevention member for preventing the cylindrical body from tilting. Device.