JPS624843Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a simple hot water supply unit that maintains the inside of a hot water storage tank at a pressure equal to atmospheric pressure.

Conventional hot water storage type hot water units are often closed types that take high-temperature hot water from the top of the hot water storage tank and replenish the corresponding amount of water from the bottom, but this is a pressure vessel that can withstand the pressure of water such as city water. Because of the need to form the structure, the structure becomes complicated and costs increase, so open-type structures are increasingly being used.

By the way, the conventional open type hot water supply unit was
As is well known from Publication No. 48-91404, etc., the structure is such that a hot water storage tank is formed into a sealed container and an expansion tank is connected to this, but the expansion tank is required separately and an appropriate installation space is required. In addition, connecting piping had to be routed during this time, resulting in a complicated device that was not suitable as a general-purpose device.

A conceivable simplified structure of an open hot water supply unit is one in which the hot water storage tank is open and an automatic water supply valve is attached to the hot water storage tank, but such a structure is shown in Fig. 2. A hot water supply unit is generally used, and an automatic water supply valve, such as a ball tap 6, is installed through the upper part of the side wall.

However, in such a structure, the water supply pipe 20 connected to the automatic water supply valve 6 is normally raised from the floor, so the water supply pipe is exposed and stands up on the side wall of the hot water tank 2, and the piping Naturally, space must be taken into consideration, and if the water heater unit is left exposed and installed outdoors, the pipes may freeze, so it becomes necessary to apply heat insulation treatment specifically for the water supply pipes, and this heat insulation layer Furthermore, various practical defects may occur, such as the installation space for the water supply piping being taken up widely, which is also undesirable as a general-purpose device.

The present invention was devised by focusing on the fact that conventional hot water supply units have their own problems. By specifying the structure for connecting water supply piping in a simple-structure open hot water storage tank, it is possible to make the hot water supply unit more compact while securing the amount of hot water stored, further reducing the installation space and on-site piping. This is because it can simplify connection work and improve serviceability.

Therefore, in order to achieve the above object, the present invention provides a hot water supply unit with a hot water storage tank 2 having an opening 25 at the top, and a top cover 3 that covers the opening 25, as clearly shown in the embodiment. a side wall 22 located above the liquid level in the hot water storage tank 2;
A part of the water supply pipe 14 is recessed inwardly to the top and has a vertical wall 26, so that the connection direction of the water supply pipe 14 to the ball tap 6 is aligned with the ball tap 6.
A ball tap 6 having a structure perpendicular to the wall surface to which the water supply is attached is attached to the vertical wall 26 by penetrating it, and a water supply pipe 14 is connected to the ball tap 6 in a space 24 outside the vertical wall 26, and the water supply pipe 14 is connected to the ball tap 6 in a space 24 outside the vertical wall 26. 14 is bent downward from the horizontal, and hangs down to the bottom of the hot water tank 2 into the heat insulating layer 4 provided on the outer periphery of the side wall 22 of the hot water tank 2 below the vertical wall 26, and further heat is applied to the inner bottom of the hot water tank 2 for heating. The exchanger 5 is arranged in the structure, and the entire ball tap 6 can be easily and completely visually inspected through the wide opening 25, and the heat exchanger 5 can be easily taken in and out. It has a feature that it fits into the heat insulating layer 4 and does not require additional heat insulation treatment.

Hereinafter, one embodiment of the present invention will be described in detail based on the accompanying drawings.

In FIG. 1, reference numeral 1 denotes a hot water supply unit, which includes a hot water storage tank 2 with an opening 25 at the top and an upper lid 3 that is disposed in the opening, and a gap between the upper lid 3 and the hot water storage tank 2. The tank is formed into an open type tank that is exposed to the atmosphere through the tank, and the inner wall is surrounded by a heat insulating layer 4 to form a heat-retaining container.

A heating heat exchanger 5 is disposed horizontally at the inner bottom of the hot water storage tank 2 and is appropriately fixed to heat the water stored in the tank from the lower layer. A condenser connected to a heat pump refrigeration system R is used.

Note that, in addition to the above-mentioned examples, the heat exchanger 5 may also be a steam heat exchanger, a hot water heat exchanger, or other heaters.

Reference numeral 6 denotes a ball tap as a water supply valve provided on the upper part of the side wall 22 of the hot water storage tank 2, and is connected to the water supply pipe 1.
The structure has an attachment part such that the connecting direction of the water tank 2 is horizontal, and the opening is made above a predetermined liquid level in the hot water storage tank 2, and when water needs to be replenished, the predetermined liquid below is It is designed to spray water towards the surface.

The hot water storage tank 2 has a hot water take-out pipe 7 pulled out from the side wall 22 at a position slightly below the liquid level, an overflow pipe 8 pulled out from an appropriate location on the side wall 22, and a drain pipe 9 pulled out from the bottom wall. 23
It is drawn from.

The hot water take-out pipe 7 is lowered inside the heat insulating layer 4, and then pulled out from the bottom of the side wall 22 to the outside of the tank through a hot water supply device such as a pump 11 in series, and the hot water supply pipe 21 is connected thereto.

On the other hand, the heat pump refrigeration system R has a compressor 1
5. It is equipped with an expansion valve 16 and a heat source side heat exchanger 17, and is connected to the heat exchanger 5 through two pipes, that is, a feed pipe 18 and a return pipe 19, so that the heat exchanger 5 can be connected to the condenser. A refrigeration cycle is formed in which the heat source side heat exchanger 17 acts as an evaporator.

In the water heater having the structure described above, a water supply passage 10 is provided in the hot water storage tank 2, so that makeup water released from the automatic water supply valve 6 can be guided to the bottom of the hot water storage tank. .

The water supply passage 10 is formed as an independent passage extending vertically within the hot water storage tank 2.
Both lower ends are open, and the upper end is located above the predetermined liquid level and directly below the water outlet of the ball tap 6 to receive reinforcement water discharged from the ball tap 6. The illustrated example uses a polyethylene resin tube with a diameter of 100 mm, which is hung vertically in the tank and fixed as appropriate.

Therefore, in the hot water supply unit 1, a part of the side wall 22 of the hot water storage tank 2 located above the liquid level in the hot water storage tank 2 is moved inward until it reaches the top of the tank as shown in FIG. It is recessed so as to have vertical walls 26, and the hot water storage tank 2 is formed into a stepped tank in which the cross-sectional area of the space 24 above the liquid level is smaller than the cross-sectional area of the puddle part below the liquid level, The ball tap 6 is attached to the side wall 22 by penetrating the space 24 formed by the recess.

On the other hand, the water supply pipe 14 connected to the ball tap 6 is placed along the side wall 22 of the hot water storage tank 2 and placed at the bottom 23.
In addition to being pulled down to the side, the water supply pipe 14 is surrounded by a heat insulating material 4 to provide heat insulation treatment.

In addition, by installing the ball tap 6 using the space 24 described above, the water supply pipe 14 bent at right angles from the connection port of the ball tap 6 can be placed in close contact with the side wall 22 of the hot water storage tank 2 without floating it. Needless to say, it can be embedded in the heat insulating layer 4 applied to the hot water storage tank 2, and the heat insulation treatment of the water supply pipe 14 alone can be omitted.

At the end of the water supply pipe 14 pulled down to the side of the bottom in this way, a connection port 13 for connecting the water supply pipe 20, for example, a hand closing valve 13, is provided. The water supply pipe 20 is connected slightly above the ground surface, and if installed indoors, the water supply pipe 20 is installed at the bottom of the floor or wall.
It is possible to connect them slightly above the floor level.

The hot water supply system operates the refrigeration system R to generate high-pressure refrigerant gas and the hot water storage tank 2 in the heat exchanger 5.
Heat of condensation is exchanged with the internally stored water, and the temperature of the water around the heat exchanger 5 gradually increases.

Then, the temperature of all layers of the stored water rises uniformly due to convection, and finally hot water of 65 to 70°C is stored in the hot water storage tank 2, and the water temperature is maintained constant according to a command from a water temperature detector (not shown). Automatic start/stop control of the refrigeration system R is performed for this purpose.

When hot water at a predetermined high temperature is stored and the tap at the point of demand is opened, a flow switch (not shown) is activated.
The pump 11 is driven by the operation, and the high-temperature hot water existing near a predetermined liquid level in the hot water storage tank 2 is sent out to the hot water supply pipe 21 through the hot water outlet pipe 7, and hot water is supplied.

At this time, an amount of make-up water equal to the amount of hot water supplied is discharged from the ball tap 6, but since this make-up water is guided by the water supply passage 10 to near the heat exchanger 5 at the inner bottom, it is not present in the tank from the hot water take-out pipe 7. High temperature water can be extracted continuously and stably.

As has been made clear through the description of the embodiments described above, the present invention provides a ball tap 6 to be attached to an open hot water storage tank 2 by attaching the ball tap 6 to the side wall 2 above the liquid level in the tank.
Since the ball tap 6 is installed using the hollow space 24 formed by a recess in a part of the water tank 2, the ball tap 6 does not protrude outward beyond the side wall 22 of the liquid level in the hot water storage tank 2, and the water heating unit is The exterior size is not large and can be stored compactly. Further, since this space 24 is located above the liquid level, a sufficient capacity for hot water supply can be secured as expected.

In addition, since the water supply pipe 14 pulled down from the ball tap 6 is housed within the heat insulating layer 4 on the outer periphery of the side wall 22 of the hot water storage tank 2, no special measures are required to insulate the water supply pipe 14, and the installation space for the hot water storage unit is not required. It is possible to make it as small as possible.

Furthermore, since the water supply pipe 20 is suspended within the heat insulating layer 4, the upright dimension of the water supply pipe 20, which is normally installed near the ground surface or floor surface, can be short, and the need for fixing the pipe can be omitted, making on-site piping work easier. It also has the advantage of

In particular, in the present invention, the wall of the recessed portion is a vertical wall 26.
Therefore, the area of the opening 25 can be made as large as possible, making it easy to take the housed heat exchanger 5 in and out for maintenance. The opening 25 allows easy and reliable visual inspection, which has the effect of improving serviceability.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of a water heater according to an embodiment of the present invention, and FIG. 2 is a schematic structural diagram of a conventional water heater unit. 2...Hot water tank, 4...Insulating material, 6...Ball tap, 13...Connection port, 14...Water supply piping, 2
0...Water pipe, 22...Side wall, 24...Vacancy, 3
...Top lid, 25...Opening, 26...Vertical wall.

Claims (1)

[Scope of utility model registration request] A hot water storage tank 2 with an opening 25 at the top and this opening 25
A part of the side wall 22 located above the liquid level in the hot water storage tank 2 is recessed inward to the top and has a vertical wall 26, A ball tap 6 having a structure in which the connection direction of the water supply piping 14 to the ball tap 6 is perpendicular to the wall surface on which the ball tap 6 is installed is installed through the vertical wall 26, while the ball tap 6 is installed in the space 24 outside the vertical wall 26. The water supply pipe 14 is connected to the water supply pipe 14, and the water supply pipe 14 is bent downward from the horizontal direction, and is suspended below the hot water tank 2 into the heat insulating layer 4 provided on the outer periphery of the side wall 22 of the hot water tank 2 below the vertical wall 26. A hot water supply unit characterized in that a heat exchanger 5 for heating is further disposed at the inner bottom of the hot water storage tank 2.