Quick-heating constant-temperature water heater

Abstract

The utility model relates to a quick-heating constant-temperature water heater, and belongs to the technical field of water heaters. The water heater comprises a heat exchanger and a heat storage water tank provided with an electric heater. The lower part of the heat storage water tank is provided with a cold water inlet connected with a cold water source; a heat source water outlet and a heat source water return port at the heat source side of the heat exchanger are connected with a high-power heat source to form a heat exchange circulating pipeline; a heat utilization side is communicated with a heating outlet and a heating inlet at the top of the heat storage water tank to form a heat exchange circulating pipeline; a heating circulating pump with adjustable circulating flow is arranged on the heat exchange circulating pipeline; a water return pipeline of the water using point leads to the heating inlet through a water return pump. According to the utility model, the hot water entering the heat storage water tank can be used immediately after entering the heat storage water tank; and it is guaranteed that the hot water outlet temperature always runs above the lowest hot water temperature acceptable for human body bathing, and it is avoided that low-temperature water output in the bathing process influences the bathing experience and health of a user.

Description

Technical Field

[0001] The utility model relates to a water heater, in particular to a fast-heating constant-temperature water heater, belonging to the technical field of water heaters. Background Art

[0002] The Chinese patent document with application number 202310036426.1 discloses a multi-energy intelligent water heater, comprising: an outer shell; an inner tank; a plate heat exchanger, whose primary side is connected to a heat source, and whose secondary side is connected to the inner tank; a hot water circulation module, one end of which is connected to the hot water outlet, and the other end of which is connected to the inner tank; a water tank temperature detection module, which comprises a first temperature sensor and a second temperature sensor, the first temperature sensor is arranged at the top of the inner tank for collecting water temperature Ts1, and the second temperature sensor is arranged at the bottom of the inner tank for collecting water temperature Ts2; a control module, which is used to set a heating temperature T0, and switch the sensing temperature of the heat source according to the comparison result of the heating temperature T0 with the water temperature Ts1 and the water temperature Ts2. Although it is introduced that this technical solution greatly reduces the frequent start and stop of the heat source, improves the utilization rate of hot water in the water tank, reduces energy consumption, and saves energy and protects the environment; however, the technical solution of this patent application has the following shortcomings: First, in the system pipeline for heating the water tank, not only is there a lack of measures to control the hot water entering the water tank to meet the "instant use" related requirements, but it is also easy to cause the water temperature of the water tank to fluctuate greatly; second, there is no constant temperature water outlet device on the water use side. When the water tank capacity is small and the heating heat source starts slowly, the water outlet is often lower than the comfortable bathing water temperature for the human body. In addition, the high-efficiency plate heat exchanger used in the hot water system for domestic water is easily blocked by sediment, impurities and scaling during heating, which affects the heat exchange of the system and has a high failure rate. Utility Model Content

[0003] The purpose of the utility model is to propose a fast-heating constant-temperature water heater that can achieve the "instant use" of hot water entering the water tank and avoid the outlet water being lower than the comfortable bathing water temperature for the human body in view of the problems existing in the above-mentioned prior art.

[0004] In order to achieve the above-mentioned purpose, the basic technical scheme of the utility model fast-heating constant-temperature water heater is as follows: it includes a heat exchanger and a heat storage tank equipped with electric heating; the upper part of the heat storage tank has a hot water outlet leading to a water use point through a water-water proportional valve, and the lower part has a cold water inlet connected to a cold water source; the heat source outlet and the heat source return port on the heat source side of the heat exchanger are connected to a high-power heat source to form a heat exchange circulation pipeline, and the heat use side is connected to the heating outlet and the heating inlet at the top of the heat storage tank to form a heat exchange circulation pipeline; the heat exchange circulation pipeline is provided with a heating circulation pump with adjustable circulation flow; the return water pipeline of the water use point leads to the heating inlet through the return water pump.

[0005] In this way, when the utility model is in operation, on the heating side of the water tank, as long as the flow rate of the heating circulation pump is reasonably adjusted in real time according to the outlet water temperature of the heat source, the outlet water temperature of the heated water, the temperature of the lower part of the water tank, the set temperature of the water tank, and the minimum hot water temperature acceptable to human body bathing, it can be ensured that the outlet water temperature of the heated water is always higher than the minimum hot water temperature acceptable to human body bathing, thereby realizing the "ready-to-use" of hot water entering the heat storage tank; and on the water use side of the heat storage tank, as long as the opening of the water use proportional valve is reasonably adjusted in real time according to the outlet water temperature of the hot water, the temperature of the upper part of the water tank, and the minimum hot water temperature acceptable to human body bathing, it can be ensured that the outlet water temperature of the hot water is always above the minimum hot water temperature acceptable to human body bathing, thereby avoiding the low-temperature water output during the bathing process affecting the bathing experience and health of the user.

[0006] Furthermore, the high-power heat source is one of a heat pump water heater, a gas water heater, a solar collector, and a heating hot water boiler.

[0007] Furthermore, a hot water proportional valve is provided on the heat exchange circulation pipeline.

[0008] Furthermore, the return water pipeline of the water use point leads to the heating inlet through a return water pump.

[0009] Furthermore, the outlet water pipeline on the hot side of the heat exchanger and the return water pipeline of the water use point pass through the first and second interfaces of the electric three-way valve respectively, and then through the third interface of the electric three-way valve through the heating circulation pump to the heating inlet at the top of the hot water storage tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a structural schematic diagram of the first embodiment of the utility model.

[0011] Figure 2 It is a structural schematic diagram of the second embodiment of the present utility model. DETAILED DESCRIPTION

[0012] Embodiment 1

[0013] The instant constant temperature water heater of this embodiment is as follows Figure 1 As shown, it includes a heat exchanger 1 and a hot water storage tank 2 equipped with electric heating. The upper part of the hot water storage tank 2 has a hot water outlet 2-1 leading to the water point through a water-water proportional valve SF1, and the lower part has a cold water inlet 2-2 connected to the cold water source. The heat source outlet 1-1 and the heat source return port 1-2 on the heat source side of the heat exchanger 1 are connected to the high-power heat source of an external heat pump water heater (or gas water heater, solar collector, heating water heater, etc.) to form a heat exchange circulation pipeline, and the heat side is connected to the heating outlet 2-3 and the heating inlet 2-4 at the top of the hot water storage tank 2 to form a heat exchange circulation pipeline. The heat exchange circulation pipeline is provided with a hot water proportional valve SF2 and a heating circulation pump P1 with adjustable circulation flow. The return water pipeline of the water point leads to the heating inlet 2-4 through the return water pump P2.

[0014] When working, on the heating side of the water tank, the flow of the circulation pump and the opening of the SF2 water proportional valve can be adjusted in real time according to the logical relationship between Th1 (heat source water outlet temperature), Tu1 (heating water outlet temperature), Ts2 (water tank lower temperature), Ts setting (water tank set temperature), and T lower limit (the lowest hot water temperature acceptable to human body bathing), so that Tu1 can be controlled to run above the T lower limit, and the hot water entering the water tank can be "used immediately after entering". On the water side of the water tank, the opening of the water proportional valve SF1 can be adjusted in real time according to the logical relationship between TR (hot water outlet temperature), Ts1 (water tank upper temperature), and T lower limit. By controlling the flow, TR can always run above the T lower limit, avoiding the low-temperature water output during the bathing process from affecting the user's bathing experience and health.

[0015] Embodiment 2

[0016] The instant constant temperature water heater of this embodiment is as follows Figure 2 As shown, its basic structure is the same as that of the first embodiment, except that: first, only a heating circulation pump P1 with adjustable circulation flow is provided on the heat exchange circulation pipeline, but no hot water proportional valve SF2; second, the return water pipeline of the water use point does not need to pass through the return water pump P2 to the heating inlet 2-4.

[0017] Specifically, the water outlet pipeline of the heat exchanger 1 and the water return pipeline of the water use point are respectively connected to the two switchable first interfaces a and second interfaces b of the electric three-way valve F, and then connected to the heating inlet 2-4 at the top of the hot water storage tank 2 through the third interface c of the electric three-way valve and the heating circulation pump P1. In this way, the same function can be achieved, and the return pump P2 is omitted.

[0018] In addition to the above embodiments, the present invention may also have other implementations. For example, the hot water proportional valve SF2 is removed in the first embodiment, or the hot water proportional valve SF2 is added in the second embodiment. Any technical solution formed by equivalent replacement or equivalent transformation falls within the protection scope required by the present invention.

Claims

1. A fast-heating constant-temperature water heater, comprising a heat exchanger and a hot water storage tank equipped with electric heating; the upper part of the hot water storage tank has a hot water outlet leading to a water point through a water-water proportional valve, and the lower part has a cold water inlet connected to a cold water source; characterized in that: The heat source water outlet and heat source water return port on the heat source side of the heat exchanger are connected to a high-power heat source to form a heat exchange circulation pipeline, and the hot side is connected to the heating outlet and heating inlet on the top of the hot water storage tank to form a heat exchange circulation pipeline; the heat exchange circulation pipeline is provided with a heating circulation pump with adjustable circulation flow.

2. The instantaneous constant temperature water heater according to claim 1, characterized in that: The high-power heat source is one of a heat pump water heater, a gas water heater, a solar collector and a heating water heater.

3. The instantaneous constant temperature water heater according to claim 1 or 2, characterized in that: A hot water proportional valve is arranged on the heat exchange circulation pipeline.

4. The instantaneous constant temperature water heater according to claim 3, characterized in that: The return water pipeline of the water use point leads to the heating inlet through the return water pump.

5. The instantaneous constant temperature water heater according to claim 1 or 2, characterized in that: The outlet water pipeline on the hot side of the heat exchanger and the return water pipeline of the water use point are respectively connected to the first interface and the second interface of the electric three-way valve, and then to the heating inlet on the top of the hot water storage tank through the third interface of the electric three-way valve and the heating circulation pump.

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