JP2000304351A - Hot water storage type water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hot water storage type water heater with a header for effectively suppressing the agitation of thermal stratification and at the same time making uniform temperature distribution in the longitudinal direction when a cylindrical water storage tank is used while being placed horizontally. SOLUTION: A hot water storage tank 2 where a cylindrical tank is placed horizontally is provided with a first header 3 at the inflow port of hot water being heated by a heat pump type water heater 1 and a second header 3 at the inflow port of supplied water. The first header 2 has a number of small holes, gives a flow constituent in upper direction to hot water that flows in, and at the same time extends an inflow span. On the other hand, the second header 3 has a number of small holes, gives a flow constituent in a downward direction to process water that flows in, and at the same time extends the inflow span.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water storage type water heater provided with a low-temperature hot water storage tank in which a cylindrical shape is placed horizontally.

[0002]

2. Description of the Related Art Various types of hot water storage type electric water heaters have already been developed.
Like the hot water storage type electric water heater shown in US Pat. No. 5,884,
A hot-water storage type electric water heater equipped with a low-temperature hot water storage tank consisting of a flat wall whose bottom wall having a water supply port is supported by a structure has been researched and developed. The baffle structure that can apply the incoming city water and hot water to the flow straightening plate to reduce the inflow speed and make the inflow direction along the tank wall rather than taking in the water, reduces the effect of dynamic pressure. In addition, the stirring of the temperature stratification in the hot water storage tank is suppressed.

[0003]

However, in the above-mentioned conventional configuration, in a low-temperature hot water storage tank in which a cylindrical shape is placed horizontally, an installation place of a baffle structure is not flat,
When arranged on a curved surface inside the cylindrical body, the effect of dynamic pressure can be suppressed for the flow in the tank longitudinal direction, but the effect is reduced for the flow in the tank circumferential direction.

In view of the above, the present invention has been made to solve the conventional problems, and uses a header which is simpler than the conventional one. The header reduces the inflow speed of city water or hot water into the tank and is supplied from the upper side of the tank. The purpose of the present invention is to provide a hot water storage type water heater capable of protecting temperature stratification from the influence of dynamic pressure by blowing hot water upward and discharging city water supplied from the lower side of the tank downward. .

Further, in the conventional baffle structure provided with a current plate, the reaching distance of city water or hot water after deceleration cannot be lengthened to prevent the above-mentioned agitation, so that the temperature distribution in the tank longitudinal direction can be made uniform. There was a disadvantage that there was no.

Accordingly, the present invention is to solve the conventional problem. By providing a header with an inflow span whose ratio to the length in the longitudinal direction of the tank is a predetermined value, a hot water storage type capable of uniforming the temperature distribution in the longitudinal direction. It is intended to provide a water heater.

[0007]

To achieve this object, the present invention provides, as a first means, a heat pump type water heater, a cylindrical hot water storage tank for horizontal installation, and A circulating water inlet of the heat pump water heater is connected to a circulating water outlet at a lower portion of the hot water storage tank, and a circulating water outlet of the heat pump water heater returns a circulating water return at an upper portion of the hot water tank. The header is connected to the mouth, and the header is installed longitudinally and horizontally inside the hot water storage tank from the circulating water return port, and a plurality of small holes are provided above the header.

[0008] Thereby, the stirring of the temperature stratification in the hot water storage tank can be suppressed.

Further, the ratio of the length of the header to the longitudinal length of the hot water storage tank is set to a predetermined value.

Thus, the temperature distribution in the longitudinal direction of the hot water storage tank can be made uniform.

The second means comprises a heat pump type water heater, a cylindrical hot water storage tank for horizontal installation, and a header provided in the hot water storage tank. Hot water to be stored is taken out from a hot water outlet above the hot water storage tank, and city water is supplied from a city water inlet below the hot water storage tank. The header is installed longitudinally and horizontally inside the hot water storage tank from the city water inlet, and has a plurality of small holes below the header.

[0012] Thereby, the stirring of the temperature stratification in the hot water storage tank can be suppressed.

Further, the ratio of the length of the header to the length in the longitudinal direction of the hot water storage tank is set to a predetermined value.

Thus, the temperature distribution in the longitudinal direction of the hot water storage tank can be made uniform.

As a third means, a small hole having a small hole total area such that the outflow speed is equal to or less than a predetermined value is provided in the header according to the first means or the second means. is there.

Thus, the stirring of the temperature stratification in the hot water storage tank can be suppressed.

As a fourth means, a small hole is provided in which the hole diameter at the entrance of the header is smaller than the hole diameter at the end.

[0018] Thus, the stirring of the temperature stratification in the hot water storage tank can be suppressed.

[0019]

The invention according to claim 1 comprises a heat pump type water heater, a cylindrical hot water storage tank for horizontal installation, and a header provided in the hot water storage tank. The circulating water inlet of the heat pump type water heater is connected to the circulating water outlet at the lower part of the hot water storage tank, the circulating water outlet of the heat pump type water heater is connected to the circulating water return port of the upper part of the hot water storage tank, and the header is It is installed longitudinally and horizontally inside the hot water storage tank from the water return port, and is provided with a plurality of small holes on the upper side of the header, by branching hot water through these small holes,
By reducing the inflow speed into the hot water storage tank and making the outflow direction upward, there is an effect that the effect of dynamic pressure on the hot water storage tank can be suppressed.

Further, the ratio of the length of the header to the length in the longitudinal direction of the hot water storage tank is set to a predetermined value, and has an effect of increasing the outflow span of the header.

According to a second aspect of the present invention, the hot water stored in the hot water storage tank is constituted by a cylindrical hot water storage tank for horizontal installation, and a header provided in the hot water storage tank. The city water is taken out from the hot water outlet above the hot water storage tank, and city water is supplied from the city water inlet below the hot water storage tank. The header is installed longitudinally and horizontally inside the hot water storage tank from the city water inlet, and is provided with a plurality of small holes under the header, and the city water is branched by the small holes. By reducing the inflow speed into the hot water storage tank and making the outflow direction downward, the effect of suppressing the effect of dynamic pressure on the hot water storage tank is obtained.

Further, the ratio of the length of the header to the length in the longitudinal direction of the hot water storage tank is set to a predetermined value, and has an effect of extending the outflow span of the header.

The invention described in claim 3 is the first invention.
Alternatively, the header of the invention according to claim 2 is further provided with a small hole having an area such that the outflow speed is equal to or less than a predetermined value, the inflow speed is reduced, and the dynamic pressure into the hot water storage tank is reduced. Has the effect of suppressing the effects.

The invention described in claim 4 is the first invention.
Alternatively, in the header according to the invention described in Item 2, the diameter of the hole at the inlet portion is smaller than the diameter of the hole at the end portion, and has an effect of making the outflow speeds of the small holes substantially equal.

An embodiment of the hot water storage type water heater according to the present invention will be described below with reference to the drawings. Note that the same components as those of the related art are denoted by the same reference numerals, and detailed description thereof will be omitted.

(Embodiment 1) FIG. 1 is a configuration diagram of a hot water storage type water heater according to Embodiment 1 of the present invention. FIG. 3 is a configuration diagram of the first header of the embodiment. FIG. 5 is a temperature difference characteristic diagram at both ends of the upper part of the hot water storage tank of the embodiment.

The hot water storage type water heater of the present embodiment comprises a heat pump type water heater 1 and a cylindrical hot water storage tank 2 for horizontal installation.
And a circulating water inlet 9 of the heat pump type water heater 1 is connected to a circulating water outlet 5 at a lower portion of the hot water storage tank 2 so that the heat pump type water heater 1 circulates. The water outlet 10 is connected to the circulating water return port 6 at the top of the hot water storage tank 2, and the first header 3 is installed in the hot water tank 2 from the circulating water return port 6 in the longitudinal direction and horizontally.

Here, the first header 3 is preferably made of a copper pipe having excellent corrosion resistance and workability. The first header 3 is generated by the heat pump type water heater 1 and flows into the circulating water return port 6 above the hot water storage tank 2. The average flow velocity of the warm water from the small holes provided in the first header 3 was set to 0.1 m / s or less. The small hole total area satisfying this condition is (Equation 1). In addition, the small holes provided in the first header 3 are arranged at the upper part of the main body of the first header 3 so that the outflow direction is directed upward, and the effect of the dynamic pressure on the center direction of the hot water storage tank 2 is reduced.

[0029]

(Equation 1)

Next, as shown in FIG. 3, in the small holes of the first header 3, by making the diameter of the inlet 3a smaller than the diameter of the end 3b, the outflow speed of the hot water in each small hole is made substantially equal. In addition, the stirring of the temperature stratification in the hot water storage tank 2 can be suppressed.

Further, the length 3c of the first header 3 is shown in FIG.
From the temperature difference characteristics between the upper and lower ends of the hot water storage tank shown in FIG. 3, the effective length is 1/4 or more of the length of the hot water storage tank 2a. However, in this embodiment, the length of the first header 3 is 3
c is the ratio of the hot water storage tank length 2a to about 1/3,
Further, by arranging the small holes at the same pitch, the temperature distribution in the longitudinal direction can be made uniform.

(Embodiment 2) FIG. 2 is a configuration diagram of a hot water storage type water heater according to Embodiment 2 of the present invention.

The hot water storage type water heater of this embodiment comprises a heat pump water heater 1, a cylindrical hot water storage tank 2 for horizontal installation, and a second header 4 provided in the hot water storage tank 2. The hot water stored in the hot water storage tank is taken out from a hot water outlet 8 at an upper portion of the hot water storage tank 2, and city water is supplied from a city water inlet 7 at a lower portion of the hot water storage tank 2. The second header 4 is installed in the hot water storage tank 2 from the city water inlet 7 in the longitudinal direction and horizontally.

Here, it is preferable to use a copper pipe having excellent corrosion resistance and workability for the second header 4, and the city water supplied from the city water inlet 7 below the hot water storage tank 2 is provided in the second header 4. 0.1m average outflow velocity from the pit
/ S or less. The small hole total area satisfying this condition is (Equation 1). The small holes provided in the second header 4 are arranged at the lower part of the main body of the second header 4 so that the outflow direction is downward, and the influence of the dynamic pressure applied to the hot water storage tank 2 is reduced.

Next, as shown in FIG. 4, by making the hole diameter of the inlet portion 4a of the second header 4 smaller than the hole diameter of the end portion 4b of the second header 4, the outflow speed of the hot water in each small hole is made substantially equal. By doing so, stirring of the temperature stratification in the hot water storage tank 2 can be suppressed.

Further, the length 4c of the second header 4 is shown in FIG.
From the temperature difference characteristics at the lower end of the hot water storage tank shown in FIG. 3, the effective length is 1/4 or more of the length of the hot water storage tank 2a.
c is the ratio of the hot water storage tank length 2a to about 1/3,
Further, by arranging the small holes at the same pitch, the temperature distribution in the longitudinal direction can be made uniform.

[0037]

As described above, the first aspect of the present invention comprises a heat pump type water heater, a cylindrical hot water storage tank for horizontal installation, and a header provided in the hot water storage tank. The circulating water inlet of the heat pump type water heater is connected to a circulating water outlet at the lower part of the hot water storage tank, the circulating water outlet of the heat pump type water heater is connected to the circulating water return port of the upper part of the hot water storage tank, and the header is A plurality of small holes are provided in the hot water storage tank in the longitudinal direction and horizontally from the circulating water return port, and a plurality of small holes are provided on the upper side of the header. Slow down the inflow speed into the tank,
By making the outflow direction upward, the influence of the dynamic pressure applied to the hot water storage tank can be reduced, and the stirring of the temperature stratification in the hot water storage tank can be suppressed.

Further, by making the ratio of the length of the header to the length in the longitudinal direction of the hot water storage tank a predetermined value, the outflow span of the header is lengthened and the temperature distribution in the longitudinal direction of the hot water storage tank is reduced. It can be made uniform.

The invention according to claim 2 comprises a heat pump type water heater, a cylindrical hot water storage tank for horizontal installation, and a header provided in the hot water storage tank. The hot water stored in the hot water storage tank is taken out from a hot water outlet above the hot water storage tank, and city water is supplied from a city water inlet below the hot water storage tank. The header is installed longitudinally and horizontally inside the hot water storage tank from the city water inlet, and is provided with a plurality of small holes under the header, and the city water is branched by the small holes. By reducing the inflow speed into the hot water storage tank and making the outflow direction downward, the effect of dynamic pressure applied to the hot water storage tank is reduced, and the stirring of the temperature stratification in the hot water storage tank is suppressed. be able to.

Furthermore, by making the ratio of the length of the header to the length of the hot water storage tank in the longitudinal direction a predetermined value, the outflow span of the header is lengthened and the temperature distribution in the longitudinal direction of the hot water storage tank is reduced. It can be made uniform.

According to a third aspect of the present invention, in addition to the first or second aspect of the present invention, the header has a small hole total area smaller than a predetermined value, thereby providing a dynamic pressure applied to the hot water storage tank. Can be reduced.

According to a fourth aspect of the present invention, in addition to the first or second aspect of the present invention, the outlet diameter of the inlet portion of the header is made smaller than that of the end portion, so that the outlet speed of the hot water in each small hole is reduced. The temperature distribution can be made substantially equal, and the temperature distribution in the longitudinal direction of the hot water storage tank can be made uniform.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a first embodiment of a hot water storage type water heater according to the present invention.

FIG. 2 is a configuration diagram of Embodiment 2 of a hot water storage type water heater according to the present invention.

FIG. 3 is a configuration diagram of a first header 3 of the embodiment.

FIG. 4 is a configuration diagram of a first header 3 of Embodiment 2 of the hot water storage type water heater according to the present invention.

FIG. 5 is a characteristic diagram of a temperature difference between upper and lower ends of a hot water storage tank according to the first embodiment of the hot water storage type water heater according to the present invention.

FIG. 6 is a characteristic diagram of the temperature difference between both ends of the lower part of the hot water storage tank in the second embodiment of the hot water storage type water heater according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heat pump type water heater 2 Hot water storage tank 2a Length of hot water storage tank 3 First header (header) 3a Inlet of first header 3b End of first header 3c Length of first header 4 Second header (header) 4a 2 Header inlet 4b End of second header 4c Length of second header 5 Circulation outlet 6 Circulation return 7 City water inlet 8 Hot water outlet 9 Circulating water inlet 10 Circulating water outlet

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Kazuyuki Hamada 4-5-2-5 Takaida Hondori, Higashi-Osaka City, Osaka Prefecture Inside Matsushita Refrigerating Machinery Co., Ltd. (72) Shigeo Aoyama 4-chome Takaida Hondori, Higashi-Osaka City, Osaka Prefecture 2-5 Matsushita Refrigeration Machinery Co., Ltd. (72) Inventor Masao Matsushita 1-4-1 Shinsenri Nishimachi, Toyonaka City, Osaka Prefecture National Housing Industry Co., Ltd. (72) Inventor Kazuhiko Machida Takaida Motodori, Higashi Osaka City, Osaka 4-5-2-5 Matsushita Refrigerating Machinery Co., Ltd. (72) Inventor Masao Kimura 3-2-2, Nakanoshima, Kita-ku, Osaka-shi, Osaka Kansai Electric Power Co., Inc.

Claims (4)

[Claims] 1. A heat pump type water heater, a cylindrical hot water storage tank for horizontal installation, and a header provided in the hot water storage tank, wherein a circulating water inlet of the heat pump type water heater is provided with the hot water storage tank. The circulating water outlet of the lower part of the tank is connected to the circulating water outlet of the heat pump type water heater, and the circulating water return port of the upper part of the hot water storage tank is connected to the header. Hot water storage type, wherein a plurality of small holes are provided on the upper side of the header, and a ratio of a length of the header to a longitudinal length of the hot water storage tank is a predetermined value. Water heater. 2. A hot-pump type water heater comprising a heat pump type water heater, a cylindrical hot water storage tank for horizontal installation, and a header provided in the hot water storage tank, wherein the hot water stored in the hot water storage tank is provided by the hot water storage tank. The city water is taken out from an upper hot water outlet, city water is supplied from a city water inlet below the hot water storage tank, the header is installed longitudinally and horizontally inside the hot water storage tank from the city water inlet, and the second header A plurality of small holes on the lower side, and a ratio of a length of the header to a longitudinal length of the hot water storage tank is a predetermined value. 3. The hot water storage type water heater according to claim 1, wherein the header has a total small hole area such that an outflow speed is equal to or less than a predetermined value. 4. The hot water storage type water heater according to claim 1, wherein a hole diameter at an inlet portion of the header is smaller than a hole diameter at an end portion.