JPH04366352A - Hot water feeder - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water heater that uses oil or gas as a heat source and is mainly used for home use.

0002

2. Description of the Related Art A conventional water heater has a structure in which a heat exchanger 2 is provided above a burner 1, as shown in FIG. It has become. If the water holding capacity of the heat exchanger is small, the water in the heat exchanger 2 will be post-boiled due to the amount of heat held by the burner 1 and the heat exchanger 2 after combustion has stopped, and immediately after hot water is tapped,
If you use hot water, there is a risk of hot water coming out and causing burns. To prevent this, a mixing tank 6 whose lower part is connected to the hot water supply port 4 is connected to the outlet 5 of the heat exchanger 2, and the hot water (usually 60°C or higher) that comes out of the heat exchanger 2 by post-boiling is connected to the outlet 5 of the heat exchanger 2. ) and suitable temperature water (40℃) in mixing tank 6.
The configuration was such that a large capacity mixing tank 6 was used to reduce after-boiling so that the water did not become hotter than the appropriate temperature by 10 degrees Celsius or more when mixing the water (before and after).

0003

[Problems to be Solved by the Invention] In the configuration of the mixing tank 6 of the conventional water heater, hot water coming out of the heat exchanger 2 due to post-boiling enters from the top of the mixing tank 6 and flows into the mixing tank 6. Mixing is only carried out in a narrow area at the upper part of the inlet, and the entire mixing tank 6 is not sufficiently stirred, and before the hot water mixes with the suitable temperature water in the lower part, the water pressure in the lower part of the mixing tank is successively pushed out. It will be done. Therefore, the mixing of hot water and moderate temperature water is poor. Therefore, even in a domestic water heater, the amount of canned water in the heat exchanger 2 (about 0.3 to 0.5 liters) is about 3 to 4 times (approximately 1
This necessitates a mixing tank 6 with a large capacity (approximately 2 liters), which poses a problem of increasing the size and cost of the product.

[0004] Furthermore, when used first thing in the morning, the hot water heated to an appropriate temperature by the heat exchanger enters the mixing tank 6, mixes with the cold water in the upper part, and sequentially pushes out the cold water in the mixing tank 6. , cold water in the mixing tank 6,
The appropriate temperature water will not come out until the mixed lukewarm water has finished coming out. Therefore, in the mixing tank 6 having a large capacity, it takes a long time to produce hot water at an appropriate temperature, which causes problems such as wasting water and making it uneconomical.

[0005] The present invention solves these conventional problems, and improves the mixing of hot water and suitable temperature water by post-boiling, and provides an economical and easy-to-use hot water supply system with a small-capacity mixing tank configuration. The primary purpose is to provide opportunities.

[0006] A second object is to facilitate drainage of the mixing tank.

[0007]

[Means for Solving the Problems] In order to achieve the above-mentioned problems, the present invention includes a burner, a combustion chamber, a heat exchanger provided above the combustion chamber and connected to a water supply pipe, and a hot water outlet of the heat exchanger. A hot water inlet pipe, a mixing tank, and a hot water outlet pipe are sequentially connected from the mixing tank, and the hot water inlet pipe and the hot water outlet pipe are made to protrude into the mixing tank and overlap, and their tips are located on opposite sides of each other, and their tips are Openings are provided facing the walls of different mixing tanks.

[0008]

[Operation] According to the present invention, with the above-described structure, the high-temperature hot water that enters the mixing tank is sufficiently mixed within the mixing tank, and the hot water from the hot water supply port is discharged as hot water at an appropriate temperature. In addition, the remaining hot water in the mixing tank is drained from the drainage hole.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A water heater according to an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a water heater, in which an instantaneous heat exchanger 2 is provided above a burner 1, and water supplied from a water supply port 3 is converted into hot water, which is then supplied from a hot water supply port 4. The heat exchanger 2 consists of a heat exchanger 7 that heats water with the combustion heat of the burner 1 and a drum 9 that forms a combustion chamber 8. is wrapped around the outside of the drum 9 to prevent the temperature of the drum 9 from rising. A mixing tank 12 is provided between the hot water supply pipe 11 connecting the outlet of the heat exchanger 2 and the hot water supply port 4, and the hot water supply pipe 11 is connected to a hot water supply pipe 13 that enters the mixing tank 12.
and an exiting hot water pipe 14.

[0010] The hot water inlet pipe 13 protrudes to the inside and lower part of the mixing tank 12, and the hot water inlet pipe opening 13a at the tip is provided facing the wall surface of the mixing tank 12, while the hot water outlet pipe 14 projects to the inside and upper part of the mixing tank 12. The hot water outlet pipe opening 14a at the tip is provided facing the wall surface of the mixing tank 12 in the opposite direction to the hot water inlet pipe opening 13a.

[0011] Immediately after tapping the hot water, burner 1 and heat exchanger 2 after combustion
The water in the heat exchanger 2 is post-boiled due to the residual heat of the hot water, and the hot water reaches a high temperature (60° C. or higher) and enters the mixing tank 12 through the hot water inlet pipe 13 through the hot water inlet pipe opening 13a when it is reused. The hot water discharged toward the lower wall of the mixing tank spreads around the entire circumference along the hemispherical wall, and the hot water protrudes from the bottom of the mixing tank 12 toward the upper wall in the opposite direction to the inlet pipe opening 13a. Output pipe opening 14a of pipe 14
During this time, high-temperature hot water rises from the bottom of the mixing tank 12 along the wall while mixing with moderate-temperature water, and conversely, low-temperature moderate-temperature water at the top of the mixing tank 12 falls below the center. Also, it is mixed with hot water and mixed well with suitable temperature water (around 40° C.) in the mixing tank 12. The mixing tank capacity is approximately the same as the water capacity in the heat exchanger (approximately 0
．． 3 to 0.4 liters), it is possible to prevent the temperature of hot water supplied from the hot water supply port 4 from being 10° C. or more higher than the appropriate temperature at the maximum, and it is possible to provide a small and easy-to-use water heater.

FIG. 2 FIG. 3 is a sectional view of a mixing tank of another embodiment, and in FIG. 2, the heat exchanger (
The hot water that comes out through the hot water inlet pipe 15 passes through the inlet pipe 15 and is blown out toward the wall of the mixing tank 16 from the inlet pipe opening 15a that protrudes inward from the upper side of the mixing tank 16, forming a hemispherical shape. It spreads all around the wall,
While reaching the outlet pipe opening 17a protruding inward from the lower side of the mixing tank 16 in the opposite direction to the inlet pipe 15a, high-temperature boiling water is mixed from the bottom of the mixing tank 16 along the entire circumference along the wall surface. Since the hot water rises, it is well mixed with hot water at a suitable temperature in the mixing tank 16, and is supplied through a hot water outlet pipe 17 from a hot water supply port (not shown).

[0013] Also, the mixing tank 16 of the hot water outlet pipe 17
A drain port 18 is opened at the lower part of the mixing tank 16, and the remaining water in the mixing tank 16 can be drained by removing a drain plug (not shown) provided on the side of the hot water supply port.

[0014] The connection direction of the inlet pipe 15 and the outlet pipe 17 that protrude into the mixing tank is not limited to the upper or lower direction.
It goes without saying that substantially the same stirring effect can be obtained in the horizontal direction, or in the same direction such as upward, downward, and horizontal directions. FIG. 4 shows the hot water intake pipe 15,
A tapping pipe 17 is connected from the bottom of the mixing tank 16.

[0015]

[Effects of the Invention] As described above, in the water heater of the present invention, the hot water inlet pipe and the hot water outlet pipe are made to protrude into the mixing tank and overlap, and their tips are located on opposite sides of each other, and the tips are located inside the mixing tank. Since the openings are made to face different wall surfaces, the following effects can be obtained. (1) The mixing effect of hot water and suitable temperature water by post-boiling is significantly improved, and stable hot water supply of suitable temperature water can be ensured. (2) Since the capacity of the mixing tank can be reduced to less than half of that of conventional water heaters, the main body of the water heater becomes more compact, and water can be heated to the appropriate temperature in a short time, reducing the amount of water wasted and resulting in energy savings. (3) Since a drain port is provided on the hot water pipe, the water in the mixing tank can be easily drained, and the next time hot water is supplied, hot water can be supplied quickly. Also, freezing of water in the mixing tank is avoided.

[Brief explanation of drawings]

[Fig. 1] External partial sectional view of a water heater showing an embodiment of the present invention.

[Fig. 2] Cross-sectional view of a mixing tank of another embodiment

[Fig. 3] Cross-sectional view of a mixing tank of another embodiment

[Figure 4]
Partial cross-sectional view of a conventional water heater

[Explanation of symbols]

1 Burner 2 Heat exchanger 10 Water supply pipe 11 Hot water pipe 12 Mixing tank 13　Hot water intake pipe 13a　Hot water intake pipe opening 14 Hot water outlet pipe 14a Hot water pipe opening

Claims (2)

[Claims] Claim 1: A burner, a combustion chamber, a heat exchanger provided above the burner and connected to a water supply pipe, and a hot water inlet pipe, a mixing tank, and a hot water outlet pipe connected in sequence from the hot water outlet of the heat exchanger. The hot water inlet pipe and the hot water outlet pipe are made to protrude into the mixing tank and overlap, and their tips are located on opposite sides of each other, and the tips are provided with openings facing wall surfaces in different mixing tanks. water heater. 2. The water heater according to claim 1, wherein the hot water outlet pipe connected to the mixing tank is provided with a drain port for draining hot water in the mixing tank.