JP3760397B2 - Expansion tank device in hot water circulation heater - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an expansion tank mounting structure for adjusting pressure in a circulation path and removing bubbles contained in the circulation water by interposing it in a circulation path of a hot water circulation heating device.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, it is known that a T-junction portion is provided in a circulation path, and a resin expansion tank is connected to the T-junction portion by a water circulation port provided in the lower portion (Japanese Utility Model Publication No. 51-14661). Publication).
[0003]
[Problems to be solved by the invention]
However, what is known in the above publication is that, as shown in FIG. 3, a T-shaped path portion b ′ is provided in a circulation path b connecting the boiler a and the radiator f, and the T-shaped path section b ′ is made of a resin expansion. In the case where the tank c is connected by a water circulation port provided at the lower part thereof, there is a problem that the air contained in the circulating water is drawn into the flow of the circulating water and is difficult to separate by itself.
Therefore, as shown in FIG. 4, a circulating water inlet d is provided on the side surface of the expansion tank c and a circulating water outlet e is provided on the lower surface of the expansion tank c so that the circulating water once flows into the expansion tank c. It is conceivable to reduce the flow rate of the circulating water to separate and remove bubbles contained in the circulating water.
However, in this case, since the inlet d must be integrally formed on the side surface of the expansion tank c, the resin expansion tank that can withstand the pressure rise due to the thermal expansion of the circulating water can be produced by blow molding which can be manufactured at low cost. It is difficult to manufacture. In other words, the parison can adjust the thickness and the like by increasing or decreasing the material in the longitudinal direction, but cannot increase or decrease the material in the transverse direction perpendicular to this, and it flows on the side of the expansion tank as shown in FIG. The one provided with the inlet d cannot be integrally formed by blow molding.
This invention makes it a subject to obtain the expansion tank for hot water circulation type heating apparatuses which does not have the said malfunction in view of this present condition.
[0004]
[Means for Solving the Problems]
In the invention according to claim 1 of the present application, a connecting tool for connecting a water circulation port provided in a lower portion of a resin-made expansion tank and a hot water circulation path of a hot water circulation heating device is connected to the water circulation port at the upper end. The inner cylinder is composed of an outer cylinder having a connection port and an inner cylinder arranged in the outer cylinder connected to the hot water circulation path at the lower part and facing the expansion tank, and the expansion of the inner cylinder. An inlet to the expansion tank for circulating water is provided in the part of the tank facing the surface of the water, and an outlet for circulating water from the expansion tank is provided in the outer cylinder so that the circulating water can flow into the expansion tank. By reducing the flow rate, the separation of air contained in the circulating water can be promoted, and the expansion tank is provided with an opening for a water inlet and a vent on the upper surface and a water circulation port on the lower surface. Therefore, a pressure-resistant expansion tank can be obtained by blow molding using a resin. In addition, a water level meter that knows the water level in the expansion tank is composed of a water level display tube that displays the upper limit water level position and the lower limit water level position of the water level in the expansion tank, and a water level detection circuit, the water level display tube, The upper and lower ends of the expansion tank are connected by connecting pipes connected above and below the surface of the expansion tank, and the conductive pipes are connected to the branch pipe made of an electrical insulating material branched from the two connecting pipes by connecting the upper and lower sides of the conductive pipe. A pipe is provided in parallel with the water level indicator pipe, and the height position of the electrically insulating connecting pipe connected to the conductive pipe and the lower part thereof is provided at the lower limit water level position of the water level indicator pipe or slightly below it. The conductive pipe is made part of the water level detection circuit, so that if there is circulating water up to the lower limit water level position of the water level in the expansion tank or a position slightly below it, the water level detection circuit is connected via the circulating water. If it is conducting, it is non-conducting otherwise. Therefore, if an indicator such as a lamp or a buzzer is interposed in the water level detection circuit, the presence or absence of circulating water can be easily confirmed.
[0005]
The invention according to claim 2 of the present application is the invention according to claim 1, wherein the circulating water flowing into the tank from the inlet is provided on the side surface of the inner cylinder by providing the inlet provided in the inner cylinder. Since it spreads in the horizontal direction in the tank, it does not act on the water surface in the tank, and it is possible to prevent circulating water from acting on the water surface in the tank and generating water noise.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to the drawings.
In the figure, A is a hot water circulation heating device in which the boiler 1 and the radiator 2 are connected by a hot water circulation path 3, and 4 is an expansion tank interposed in the hot water circulation path 3 of the hot water circulation heating device A. The tank 4 is provided with a water circulation port 5 in the lower part and an opening 6 for a water inlet / vent hole in the upper part, and an exhaust check valve 7 and an intake check valve 8 are provided in the opening 6. A cap 9 incorporating the above is detachably provided, and the pressure in the hot water circulating heating device A is kept constant by the action of the check valve 7 for exhaust and the check valve 8 for intake.
The expansion tank 4 includes a cylindrical tank body 4a, a cylindrical portion 4b projecting downward from the central lower surface of the tank body 4a, and a cylinder projecting obliquely upward at a biased position on one side of the upper surface of the tank body 4a. The cylindrical portion 4c and the upper and lower surfaces of the tank main body 4a are provided with tubular projections 4d and 4d for connecting both ends of a water level meter 17 to be described later. Since the cylindrical portions 4b and 4c and the tubular protrusions 4d and 4d are all present in the longitudinal direction of the parison, they can be easily blow-molded.
The lower end of the cylindrical portion 4b is the water circulation port 5, the inner peripheral surface of the cylindrical portion 4c is the opening 6, and the cap 9 is screwed to the outer periphery of the cylindrical portion 4c. The cap 9 was provided with a small hole 11 for air circulation.
[0008]
Reference numeral 12 denotes a connector for connecting the expansion tank 4 to the hot water circulation path 3, and the connector 12 includes an outer cylinder 13 having a connection port 13 a having an upper end connected to the water circulation port 5, and hot water at the lower part. The outer cylinder 13 is formed of a metal inner / outer double cylinder composed of an inner cylinder 14 which is connected to the circulation path 3 and has an upper portion facing the inside of the expansion tank 4 and penetrating the outer cylinder 13. An inlet 15 to the expansion tank 4 for circulating water is provided at the portion of the inner cylinder 14 that is watertightly bound around the inner cylinder 14 and faces the surface of the water in the expansion tank 4 of the inner cylinder 14, and expands on the side surface of the outer cylinder 13. An outlet 16 through which the circulating water flows out from the tank 4 to the hot water circulation path 3 is provided.
[0009]
If the inflow port 15 is provided at the upper end of the inner cylinder 14, circulating water flows into the expansion tank 4 from the inflow port 15 like a fountain and produces water noise. In order to prevent this, a plurality of holes are formed in the peripheral surface of the inner cylinder 14 to serve as the inlet 15, and the above-described water noise is not generated by flowing in the lateral direction into the expansion tank 4 from the inlet 15. did.
[0010]
The water level meter 17 includes a water level display tube 18 and a water level detection circuit 19 that electrically detects the water level. The water level display pipe 18 is provided at a position where the level of water in the expansion tank 4 can be confirmed from the outside, and is a transparent resin pipe provided with a mark 18a corresponding to the upper limit position of the liquid level and a mark 18b corresponding to the lower limit position. The connection pipes 20 and 20 connected to the tubular protrusions 4d and 4d are connected to the upper and lower ends of the water level display pipe 18 so that the water level display pipe 18 communicates with the inside of the expansion tank 4.
A part of the water level detection circuit 19 is provided in parallel with the water level display tube 18, and the conductive rubber is connected to the electrically insulating branch pipes 21, 21 whose upper and lower ends are branched from the connection pipes 20, 20. It comprised with the conductive tube 23 which consists of a pipe | tube etc.
To explain this, the connection height position C between the conductive pipe 23 and the lower connection pipe 22 is provided at the position of the mark 18b corresponding to the lower limit position of the water level display pipe 18, or slightly below this position. The conductive tube 23 is used as a part of the water surface detection circuit 19 in the expansion tank 4, and the water tube detection circuit 19 is configured by connecting the conductive tube 23 and, for example, a metal connector 12 with a lead wire 24.
In this case, if there is circulating water in the expansion tank 4, that is, if there is circulating water above the position of the mark 18b corresponding to the lower limit position of the water level indicator tube 18, the conductive tube 23 is in contact with the circulating water. Therefore, the water surface detection circuit 19 becomes conductive through the circulating water. However, when there is no circulating water in the expansion tank 4, the contact between the conductive tube 23 and the circulating water is cut off. Becomes non-conductive, and the presence or absence of circulating water in the expansion tank 4 can be detected.
[0011]
Therefore, the signal from the water level detection circuit 19 is input to the microcomputer 25 and processed by the microcomputer 25. When the water is out, the display means 26, for example, a lamp is lit or a buzzer is sounded and displayed. The operation of the boiler 1 and the circulation pump can be stopped by releasing the excitation of the relay 27 having the contact point 27a interposed in the boiler 1 and the operation circuit 29 of the circulation pump.
The tip of the lead wire 24 to the conductive tube 23 was connected by tightening and fixing with a tightening band 28 for tightening a portion into which the conductive tube 23 is inserted into the connection tube 22 made of the electrical insulating material.
[0012]
Water supply to the hot water circulation path 3 of the hot water circulation heating device A is performed by removing the cap 9 together with the exhaust check valve 7 and the intake check valve 8, and by setting a predetermined height position from the opening 6, That is, the injection is carried out until reaching the upper limit water level position at substantially the center position of the expansion tank 4. When the boiler 1 is operated in this state to heat the water, the pressure in the hot water circulation path 3 gradually increases due to the expansion of the hot water due to the rise in the temperature of the water, and when the pressure exceeds a predetermined pressure, the check valve 6 for exhaust is used. Opens to maintain the pressure in the expansion tank 4 at a predetermined pressure.
When the heating by the boiler 1 is stopped, the pressure in the hot water circulation path 3 decreases, and when the pressure becomes lower than the outside air, the intake check valve 8 is opened and the outside air is taken into the expansion tank 4.
In this way, the pressure in the hot water circulation path 3 is kept substantially constant by the action of the exhaust check valve 7 and the intake check valve 8.
[0013]
【The invention's effect】
According to the first aspect of the present invention, a connecting device is provided separately from the expansion tank, and simply connecting the connecting device to the expansion tank allows the circulating water to flow into the expansion tank to reduce the flow velocity. Air bubbles contained in the circulating water can be separated, and the expansion tank is provided with a water inlet / vent opening on the upper surface and a water circulation port on the lower surface. The blow molding process used can be performed and obtained at low cost. In addition, if there is circulating water to the lower limit water level position of the water level in the expansion tank or slightly below it, the water level detection circuit will be conducted through the circulating water, and if not, it will be non-conducted. The presence or absence of circulating water in the tank can be detected.
[0014]
According to the second aspect of the present invention, in addition to the above effect, the circulating water flowing into the tank from the inflow port spreads in the lateral direction in the tank, and thus does not act on the water surface in the tank, so that the circulating water Prevents water noise from acting on the water surface in the tank.
[Brief description of the drawings]
FIG. 1 is an enlarged cross-sectional view of an essential part of the main part. FIG. 2 is a perspective view of an expansion tank incorporated in a heater. FIG. 3 is a side view of a conventional example. Side view [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Boiler 2 Radiator 3 Warm water circulation path 4 Expansion tank 5 Water distribution port 6 Opening part 7 Check valve 8 Check valve 11 Small hole 12 Connector 13 Outer cylinder 14 Inner cylinder 15 Inlet 16 Outlet

Claims (2)

A connector that connects the water circulation port provided in the lower part of the expansion tank made of resin and the hot water circulation path of the hot water circulation heating device, an outer cylinder having a connection port that connects the upper end to the water circulation port, and a lower part Consists of an inner and outer double cylinder consisting of an inner cylinder provided in an outer cylinder that is connected to a hot water circulation path and the upper part faces the expansion tank, and circulates in a portion of the inner cylinder that faces the surface of the water in the expansion tank. An inlet for water to the expansion tank is provided, an outlet for circulating water to flow out of the expansion tank is provided in the outer cylinder, and a water level gauge for knowing the water level in the expansion tank is provided with the upper and lower water level positions of the water level in the expansion tank. It is composed of a water level display tube displaying the water level position, and a water level detection circuit, and the water level display tube is connected by connecting pipes whose upper and lower ends are connected above and below the water surface of the expansion tank, The upper and lower sides of the conductive tube are connected to a branch tube made of an electrical insulating material branched from the both connection tubes, An electric pipe is provided in parallel with the water level indicator pipe, and the height position of the electrically insulating connecting pipe connected to the conductive pipe and the lower part thereof is provided at the lower limit water level position of the water level indicator pipe or slightly below it. An expansion tank device in a hot water circulation heater , wherein the conductive tube is part of the water level detection circuit .   2. The expansion tank apparatus for a hot water circulation heater according to claim 1, wherein the inlet provided in the inner cylinder is composed of a plurality of small holes provided in a side surface of the inner cylinder.

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