CN221839880U - A wastewater waste heat recovery water heater - Google Patents

Abstract

The utility model discloses a waste hot water residual heat water return water heater. It comprises a cylindrical hot water inner tank, a column sleeve type water-to-water heat exchanger surrounding the outside of the cylindrical hot water inner tank, a thermal insulation layer, an electric heating tube, and a power supply thermostat. The electric hot water inner tank is located in the middle of the system, the outer periphery of the electric water heater inner tank is covered with a thermal insulation layer, and a waste heat recovery device for warming up waste water is sheathed outside the thermal insulation layer. The utility model has a simple and compact structure. It can transfer the residual heat of the discharged waste hot water to the newly entered tap water, thereby achieving the effect of saving electricity consumption.

Description

A wastewater waste heat recovery water heater

Technical Field

The utility model relates to a waste water waste heat recovery hot water device, in particular to an electric water heater which can absorb the heat of used waste water to reduce the input of electric energy.

Background Art

There are many scenes in life that require a large amount of continuous hot water supply. For example, when people take a shower or wash dishes, they need a water heater to provide continuous domestic hot water. At the same time, the temperature of the wastewater discharged when showering and washing dishes is generally 30℃~35℃. Directly discharging it into the wastewater drain pipe not only wastes resources, but also increases the temperature in the drain pipe, which is easy to breed harmful bacteria, produce odor, and affect people's health. The purpose of the utility model is to invent a water heater that can absorb the waste heat of wastewater to increase the inlet temperature of tap water of the water heater, reduce the power consumption of the water heater, and has the characteristics of simple structure, easy installation and maintenance, etc.

Summary of the invention

The utility model aims to provide a wastewater waste heat recovery water heater which has simple structure, low cost, stable and reliable performance, no noise, convenient installation, high efficiency and energy saving.

In order to achieve the above object, the utility model is implemented by the following technical solutions, which are now described as follows in conjunction with the accompanying drawings:

The wastewater waste heat recovery water heater of the utility model comprises a cylindrical closed inner tank 1, an insulation layer 2 surrounding the inner tank, a column-jacketed water-water heat exchanger 3, an electric heating tube 4, a temperature controller 5, etc., and is characterized in that:

The cylindrical closed inner tank 1 is located in the middle of the system, and the outer periphery is covered with a heat-insulating layer 2 , and the column-jacket type water-water heat exchanger 3 is surrounded by the heat-insulating layer 2 .

Furthermore, the column-jacketed water-water heat exchanger 3 is composed of a water storage space composed of two vertically placed concentric cylindrical surfaces with different diameters and an annular bottom surface, and a spiral coil 6 placed therein. The spiral coil 6 is formed by bending a pipe with good heat conductivity according to the same bending radius. The spiral coil 6 is installed in the column jacket, and wastewater flows in from the upper part of the column-jacketed water-water heat exchanger 3 and flows out from the wastewater outlet 8 at the lower part thereof. Tap water enters the spiral coil 6 from the bottom interface 9 and flows into the cylindrical closed inner tank 1 from its top port.

Furthermore, an electric heating tube 4 is arranged in the cylindrical closed inner tank 1, and the opening of the electric heating tube 4 is located at the bottom thereof and is installed vertically.

Furthermore, the water heater has a thermostat 5, and the temperature sensing hole of the thermostat 5 is located at the bottom or top of the cylindrical closed inner tank 1. The live wire of the power supply is connected to one end of the thermostat 5, and the other end of the thermostat 5 is connected to one end of the electric heating tube 4, and the other end of the electric heating tube 4 is connected to the neutral wire of the power supply.

Furthermore, in order to improve the heat exchange effect, it is generally necessary to control the outflow rate of the wastewater to ensure that the spiral coil 6 can be immersed in the wastewater. Electronic water level control technology can be used, or the drain pipe 8 can be led upward to the same height as the upper end surface of the spiral coil 6 and then discharged.

Furthermore, the wastewater may first flow through an annular filter equalizer 7 before entering the column-jacket type water-water heat exchanger 3. The annular filter equalizer 7 has a water inlet at one end connected to the wastewater pipe above, and has a plurality of downward small holes in the interior thereof along the circumferential direction.

BRIEF DESCRIPTION OF THE DRAWINGS

Figure 1 is a schematic diagram of the overall structure of the system.

Markings in the figure: 1. Cylindrical closed inner tank; 2. Insulation layer; 3. Column-type water-water heat exchanger; 4. Electric heating tube; 5. Temperature controller; 6. Spiral coil; 7. Annular filter flow equalizer; 8. Wastewater outlet; 9. Bottom interface; 10. Hot water outlet.

DETAILED DESCRIPTION

The wastewater waste heat recovery water heater of the present invention comprises a cylindrical closed inner tank 1, an insulation layer 2 surrounding the outer side thereof, a column-jacketed water-water heat exchanger 3 surrounding the outer side of the insulation layer, an electric heating tube 4, a temperature controller 5, etc., and is characterized in that: the cylindrical closed inner tank 1 is located in the middle of the system, the outer periphery of the cylindrical closed inner tank 1 is covered with an insulation layer 2, and a column-jacketed water-water heat exchanger 3 is arranged outside the insulation layer.

The column jacket type water-water heat exchanger 3 is composed of a water storage space composed of two vertically placed concentric cylindrical surfaces and an annular bottom surface and a spiral coil 6 placed therein, and the concentric cylindrical surfaces and the annular bottom surface can be welded with stainless steel materials or can be made of plastic injection molding. In the embodiment, the spiral coil 6 is formed by bending a stainless steel corrugated hose according to the same bending radius, and the spiral coil 6 is installed in the column jacket. Tap water enters the spiral coil 6 from the bottom and flows into the cylindrical closed inner tank 1 from the top port of the spiral coil 6.

An electric heating tube is arranged in the cylindrical closed inner tank 1. The opening of the electric heating tube 4 is located at the bottom of the cylindrical closed inner tank 1 and is installed vertically. During implementation, the electric heating tube 4 adopts the electric heating tube commonly used in the market.

Furthermore, the water heater has a thermostat 5, and the temperature sensing hole of the thermostat 5 is located at the bottom or the top of the cylindrical closed inner tank 1. In the implementation, the thermostat 5 adopts a liquid expansion knob thermostat commonly used on the market. The live wire of the power supply is connected to one end of the thermostat 5, and the other end of the thermostat 5 is connected to one end of the electric heating tube 4, and the other end of the electric heating tube 4 is connected to the neutral wire of the power supply.

In a specific embodiment, the cylindrical closed liner 1 is rolled with 1 mm thick SUS304 stainless steel plate, welded with 1.5 mm thick SUS304 ellipsoidal head cover, the barrel diameter is 180 mm, the height is 300 mm, and the electric heating tube 4 is a 2000 watt water heater electric heating tube commonly used on the market. The radius of the two cylindrical surfaces of the column sleeve type water-water heat exchanger 3 is 355 mm and 275 mm, and the SUS304 stainless steel plate is rolled and welded, with a plate thickness of 0.5 mm and a height of 300 mm. The insulation layer 2 is filled with polyurethane foam material with a maximum thickness of 47.5 mm. The thermostat 5 adopts a knob liquid expansion type sudden jump thermostat.

The working principle of the system is as follows: the wastewater with residual temperature is led to the upper part of the column-jacketed water-water heat exchanger 3 through a conduit, and then flows out from the wastewater outlet 8 at the bottom. The process of wastewater flowing in and out is the process of heat exchange. During the heat exchange process, the temperature of the wastewater gradually decreases as the height decreases. The cold tap water enters the spiral coil 6 through the bottom, gradually absorbs part of the heat of the wastewater as the height increases, and then enters the interior of the cylindrical closed inner tank 1 from the top. When the temperature continues to rise under the heating of the electric heating tube 4 and reaches the set temperature, it stops working. The utility model absorbs most of the residual heat of the wastewater into the tap water by introducing the column-jacketed water-water heat exchanger 3, which greatly reduces the power input of the electric water heater, and can achieve more than 50% energy saving in most application scenarios. Under the same power input, more hot water can be supplied, while the discharge temperature of the wastewater is reduced, which can reduce the growth of harmful bacteria in the drainage pipe and reduce the odor of the sewer pipe.

Claims (1)

1. The utility model provides a waste water waste heat recovery water heater, contains cylinder seal inner bag (1), encircles its heat preservation (2), column jacket formula water-water heat exchanger (3), electric heating pipe (4), temperature controller (5), characterized by: the cylindrical closed inner container (1) is positioned in the middle of the system, the periphery of the cylindrical closed inner container is covered with the heat preservation layer (2), the heat preservation layer (2) is externally provided with the cylindrical water-water heat exchanger (3), the cylindrical water-water heat exchanger (3) is formed by a water storage space formed by two concentric cylindrical surfaces which are vertically arranged in different diameters and an annular bottom surface and a spiral coil (6) arranged in the water storage space, the spiral coil (6) is formed by winding and bending a heat conduction pipe according to the same bending radius, the spiral coil is arranged in the cylindrical water-water heat exchanger (3), waste water flows in from the upper part of the cylindrical water-water heat exchanger (3), flows out from a waste water outlet (8) at the lower part of the cylindrical water-water heat exchanger, tap water enters the spiral coil from a bottom interface (9), and flows into the cylindrical closed inner container (1) from a top port of the spiral coil.