Central tank type secondary heating disposable hot water supply device recycling bathing waste heat

Abstract

This utility model relates to a centralized, box-type, two-stage heating, one-time hot water supply device for recovering waste heat from bathing. The device integrates a tap water filter, descaling device, pipeline pump, wastewater filter, primary wastewater heat exchanger, secondary wastewater heat pump with a large temperature difference for bathing wastewater, and electric auxiliary heating equipment. Tap water is directly connected to the hot water supply device. After simple filtration and descaling by the tap water filter and descaling device, the water enters the primary wastewater heat exchanger for the first heat exchange with wastewater. The heated tap water then enters the condenser of the secondary wastewater heat pump for a second heating process, ultimately reaching the set hot water temperature. The water is then directly stored in a pre-insulated water tank through the device's tap water outlet for use in bathing. This technology employs a centralized box-type structure, integrating the primary wastewater heat exchanger, secondary wastewater heat pump with a large temperature difference for bathing wastewater, filtration equipment, pipeline pump, and power distribution control equipment within the hot water supply device.

Description

Technical Field

[0001] This utility model relates to the field of heating equipment technology, specifically to a wastewater source heat pump system for hot water supply in bathing, and more specifically, to a centralized box-type secondary heating primary hot water supply device for recovering waste heat from bathing. Background Technology

[0002] Currently, the utilization rate of waste heat from bathhouse wastewater is very low, with most wastewater being directly discharged into sewers, resulting in significant energy waste. Domestically, the waste heat recovery equipment for bathhouse wastewater primarily consists of wastewater heat exchangers combined with wastewater source heat pumps to recover waste heat and produce hot water for bathing. This equipment is generally located in machine rooms, making it relatively dispersed and requiring a large area. Furthermore, the currently used waste heat recovery equipment in China typically consists of plate heat exchangers combined with ordinary heat pump units with anti-corrosion coatings, which generally suffer from difficulties in cleaning scale buildup.

[0003] For example, CN 111006377 A discloses a decentralized bathroom exhaust cascade waste heat recovery device system, including a fresh air inlet pipe, a fresh air treatment pipe, an indoor exhaust pipe, and an indoor exhaust air treatment pipe installed inside a box; plate-fin heat exchangers are connected between the fresh air inlet pipe, the fresh air treatment pipe, the indoor exhaust pipe, and the indoor exhaust air treatment pipe for the first heat exchange between indoor air and fresh air; a thermoelectric chip assembly is connected between the cold end heat exchange component and the hot end heat exchange component; the hot end heat exchange component, the cold end heat exchange component, and the thermoelectric chip assembly constitute a thermoelectric waste heat recovery device for the second heat exchange between indoor air and fresh air. This prior art reduces the temperature difference between the hot and cold ends of the thermoelectric chip by recovering heat from the bathroom exhaust air twice, improving the working performance of the thermoelectric chip and improving the recovery and utilization of waste heat from the bathroom exhaust air through the principle of two-stage heating. However, this prior art involves the thermoelectric chip performing heating twice.

[0004] For example, CN 209706383 U discloses a wastewater source heat pump for recovering heat energy from bathing wastewater, including a casing, a control box, a clean water heating chamber, a wastewater heat energy recovery chamber, and a compressor. The clean water heating chamber, wastewater heat energy recovery chamber, and compressor are sequentially arranged inside the casing from bottom to top. The compressor outlet is connected to the compressed gas copper pipe inlet A on the clean water heating chamber via a compressor output copper pipe. The compressed gas copper pipe outlet A on the clean water heating chamber is connected to the compressed gas copper pipe inlet B on the wastewater heat energy recovery chamber via a copper pipe. The compressed gas copper pipe outlet B on the wastewater heat energy recovery chamber is connected to the compressed gas inlet on the compressor. This utility model has high heat exchange efficiency and can fully recover heat from the wastewater source, reducing energy consumption. However, this prior art is a single-stage heating process, which does not fully utilize heat energy.

[0005] Furthermore, the commonly used plate heat exchanger combined with a wastewater source heat pump for producing bath water does not produce hot water in a single cycle. Instead, the hot water is circulated multiple times, heated to a set temperature, and then stored. This technology currently suffers from problems such as large footprint, difficulty in descaling, and long hot water production time. Summary of the Invention

[0006] This utility model proposes a centralized box-type secondary heating and one-time hot water supply equipment for recovering waste heat from bathing. It can solve the problems of high cost, large footprint, and numerous devices required in the heating process of large bathing venues in the prior art.

[0007] This utility model proposes a centralized box-type secondary heating and one-time hot water supply equipment for recovering bathing waste heat. It integrates a tap water filter, a descaling device, a sewage filter, a primary sewage heat exchanger, a secondary wastewater source heat pump for large temperature difference in bathing wastewater, and an electric auxiliary heating device. The tap water pipe is directly connected to the tap water inlet of the bathing hot water equipment by a flange. After simple filtration and descaling treatment by the tap water filter and descaling device, the water enters the primary sewage heat exchanger to exchange heat with the sewage for the first time.

[0008] The tap water, which has been heated once, continues to enter the condenser of the secondary bath wastewater large temperature difference special sewage source heat pump for a second heating, and finally reaches the set hot water temperature. The water is then directly stored in the finished insulated water tank through the tap water outlet of the equipment for bathing use.

[0009] Furthermore, the centralized box-type secondary heating and primary hot water supply equipment for recovering bath waste heat is equipped with filtration equipment, pipeline pumps, a primary sewage heat exchanger, a secondary sewage source heat pump for large temperature difference in bath wastewater, and power distribution and automatic control equipment.

[0010] Furthermore, the disposable hot water supply equipment is equipped with inlet and outlet for tap water and inlet and outlet for bath wastewater. After the bath wastewater at around 30°C enters the centralized box-type secondary heating disposable hot water supply equipment to recover the waste heat from the bath, the temperature drops to below 5°C and is directly discharged into the sewage pipe. Tap water enters the equipment and, after secondary heating, can be directly prepared into hot water at 45-50°C for bathing and stored in the hot water tank for use in bathing.

[0011] Furthermore, the heat source for the disposable hot water bathing equipment utilizes bathing wastewater. All bathing wastewater is collected in a sewage collection tank and transported to the sewage inlet of the equipment via a submersible sewage pump. Before entering the disposable hot water bathing equipment, the wastewater undergoes coarse filtration treatment through a hair filter and a sand filter, and then enters the sewage filter inside the equipment for secondary filtration treatment. The treated wastewater then enters the primary sewage heat exchanger to exchange heat with tap water for the first time, where the bathing wastewater exchanges heat and thus cools down.

[0012] Furthermore, the cooled bath wastewater enters the evaporator of the secondary bath wastewater large temperature difference special sewage source heat pump for a second heat release. The temperature drops to below 5°C and is discharged into the sewer pipe through the equipment's sewage outlet.

[0013] Furthermore, an electric auxiliary heating device is added as a supplementary heat source to the outlet pipe of the condenser of the special sewage source heat pump for secondary bathing wastewater with large temperature difference.

[0014] Furthermore, both the primary sewage heat exchanger and the secondary bath wastewater large temperature difference special sewage source heat pump adopt a hinged door structure. When scale buildup occurs after the equipment has been running for a period of time, the valve can be closed and the hinged door structure opened to clean the inside of the equipment with a high-pressure water gun.

[0015] This utility model technology adopts a centralized box-type structure for hot water equipment, integrating a primary sewage heat exchanger, a secondary wastewater heat pump with a large temperature difference for bathing wastewater, filtration equipment, pipeline pumps, and power distribution and control equipment into a single hot water system. The integrated equipment occupies a small area, eliminating the need for a new machine room. Utilizing a two-stage heating system, tap water is directly heated upon entering the equipment, resulting in hot water ready for bathing immediately upon exiting. The tap water heating time is short, producing hot water in a single pass. The centralized box-type bathing hot water heating equipment can be prefabricated in the factory and transported to the project site for direct connection and use, significantly shortening the construction period and improving construction efficiency. All equipment in this technology uses specialized equipment for bathing wastewater, and both the heat exchanger and sewage source heat pump employ a hinged structure, facilitating easy cleaning without affecting equipment operation. This technology solves the problems of large footprint, difficult descaling, and long hot water production times currently existing in domestic bathing wastewater waste heat recovery systems. Attached Figure Description

[0016] Figure 1 This is a system schematic diagram of a centralized box-type secondary heating and one-time hot water supply device for recovering waste heat from bathing, which is based on this utility model.

[0017] Explanation of reference numerals in the attached figures:

[0018] 1-Sewage collection tank, 2-Submersible sewage pump, 3-Hair filter, 4-Sand tank, 5-Sewage inlet, 6-Tap water inlet, 7-Tap water filter, 8-Descaling device, 9-Sewage filter, 10-Pipeline pump, 11-Primary sewage heat exchanger, 12-Secondary bath wastewater large temperature difference special sewage source heat pump, 13-Electric auxiliary heating equipment, 14-Secondary heating disposable hot water supply equipment, 15-Tap water outlet, 16-Sewage outlet, 17-Finished insulated water tank. Detailed Implementation

[0019] The invention will be described in detail below with reference to specific embodiments.

[0020] Figure 1This is a system schematic diagram of a centralized box-type secondary heating and one-time hot water supply device for recovering waste heat from bathing, which is based on this utility model.

[0021] like Figure 1 As shown, a centralized box-type secondary heating and primary hot water supply equipment for recovering bath waste heat using bath wastewater as a heat source is disclosed. The secondary heating and primary hot water supply equipment 14 is directly connected to the tap water supply. The secondary heating and primary hot water supply equipment 14 sequentially integrates and installs a tap water filter 7, a descaling device 8, a wastewater filter 9, a pipeline pump 10, a primary wastewater heat exchanger 11, a secondary wastewater heat pump with a large temperature difference for bath wastewater 12, and an electric auxiliary heating device 13.

[0022] The secondary heating single-use hot water supply equipment 14 is a single-use hot water production equipment. This equipment is directly connected to the tap water inlet 6 via a flange. After simple filtration and descaling treatment by the tap water filter 7 and descaling device 8, the water enters the primary sewage heat exchanger 11 through the pipeline pump 10 to exchange heat with the sewage for the first time. The tap water is preheated from 15°C to 25°C and then enters the condenser of the secondary bath wastewater large temperature difference special sewage source heat pump 12 for a second heating. Finally, the hot water reaches the set temperature of 45°C and is directly stored in the finished insulated water tank 17 through the equipment tap water outlet 15 for bathing use.

[0023] The hot water equipment 14 utilizes bathing wastewater as its heat source. All bathing wastewater is collected in the sewage collection tank 1 and filtered by the submersible pump 2, hair filter 3, and sand filter 4 before being transported to the sewage inlet 5 of the secondary heating primary hot water supply equipment 14. The wastewater then enters the sewage filter 9 for secondary filtration. The treated wastewater then enters the primary sewage heat exchanger 10 for the first heat exchange with tap water. The bathing wastewater releases heat from 31°C to 21°C before entering the evaporator of the secondary bathing wastewater large temperature difference dedicated sewage source heat pump 12 for the second heat release. The temperature drops below 5°C and is discharged into the sewer pipe through the equipment sewage outlet 16.

[0024] It is worth noting that if users require higher-temperature hot water for bathing, an electric auxiliary heating device 13 can be added to the outlet pipe of the condenser of the secondary bathing wastewater large temperature difference special sewage source heat pump 12 as a supplementary heat source to increase the temperature of the hot water for bathing.

[0025] In addition, both the primary wastewater heat exchanger 11 and the secondary wastewater heat pump 12, designed for large temperature differences in bathing wastewater, adopt a hinged gate structure. When scaling occurs after the equipment has been running for a period of time, the valves can be closed and the hinged gate structure opened to clean the inside of the equipment with a high-pressure water gun. The pipeline pump 10 can be selectively installed according to the actual situation of the project.

[0026] After collection, the temperature of the bathing wastewater is around 30-35℃. After passing through a primary wastewater heat exchanger, the temperature drops to 23℃ before entering a secondary wastewater source heat pump with a large temperature difference, where it is further heated to 5℃. The wastewater is then discharged into the sewage system after secondary heat treatment. In northern my country, tap water temperatures are typically between 10℃ and 15℃. This portion of tap water used for bathing is heated to 25℃ through a primary wastewater heat exchanger and then further heated to 45℃ by the secondary wastewater source heat pump. The prepared hot water is then stored in a bathing hot water tank for later use. This equipment is a disposable water production system. If users require higher temperatures for bathing, an electric auxiliary heating device can be added after the secondary heating stage as a supplementary heat source. When scaling occurs after a period of operation, the secondary heating equipment inside the container uses a hinged door structure. When the online monitoring system alarms, operators can close the valves and open the hinged door structure during intermittent operation to clean the inside of the equipment with a high-pressure water gun. Each cleaning session takes about 1 hour and should be done every six months.

[0027] As described above, the centralized box-type structure adopted in this utility model integrates a primary sewage heat exchanger, a secondary wastewater heat pump with a large temperature difference for bathing wastewater, filtration equipment, pipeline pumps, and power distribution and control equipment into a single hot water system. The integrated system occupies a small area and eliminates the need for a new machine room. Employing a two-stage heating method, tap water is directly heated upon entering the system, resulting in hot water ready for bathing immediately upon exiting. The tap water heating time is short, producing hot water in a single pass. The centralized box-type bathing hot water heating system can be prefabricated in the factory and transported to the project site for direct connection and use, significantly shortening the construction period and improving efficiency. All equipment in this technology utilizes specialized bathing wastewater equipment, and both the heat exchanger and sewage source heat pump employ a hinged structure, facilitating easy cleaning without affecting equipment operation. This technology solves the problems of large footprint, difficult descaling, and long hot water production times currently existing in domestic bathing wastewater waste heat recovery systems.

[0028] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions created by the present invention, and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions created by the present invention without departing from the essence and scope of the technical solutions created by the present invention.

Claims

1. A centralized box-type secondary heating and primary hot water supply equipment for recovering waste heat from bathing, characterized in that, in, The hot water equipment for bathing integrates a tap water filter (7), a descaling device (8), a sewage filter (9), a pipeline pump (10), a primary sewage heat exchanger (11), a secondary sewage source heat pump for large temperature difference of bathing wastewater (12), and an electric auxiliary heating device (13). Among them, the secondary heating disposable hot water equipment (14) is connected to the tap water inlet (6) by a flange, and after simple filtration and descaling treatment by the tap water filter (7) and descaling device (8), it enters the primary sewage heat exchanger (11) to exchange heat with sewage for the first time; The tap water that has been heated once continues to enter the condenser of the secondary bath wastewater large temperature difference special sewage source heat pump (12) for a second heating, and finally reaches the hot water set temperature. It is then directly stored in the finished insulated water tank (17) through the tap water outlet (15) of the equipment for bathing use.

2. The centralized box-type secondary heating and primary hot water supply equipment for recovering waste heat from bathing as described in claim 1, characterized in that, The centralized box-type secondary heating disposable hot water production equipment (14) for recovering bath waste heat is equipped with a filtration device, a primary sewage heat exchanger (11), a secondary wastewater source heat pump (12) for large temperature difference of bath wastewater, and power distribution control equipment.

3. The centralized box-type secondary heating and primary hot water supply equipment for recovering waste heat from bathing as described in claim 1, characterized in that, The secondary heating disposable hot water supply equipment (14) is equipped with tap water inlet and outlet and bath wastewater inlet and outlet. After the bath wastewater of about 30°C enters the centralized box-type secondary heating disposable hot water supply equipment for recycling bath waste heat, the temperature drops to below 5°C and is directly discharged into the sewage pipe. After the tap water enters the equipment and is heated in two stages, it can directly prepare bath hot water of 45-50°C and store it in the bath hot water tank for bathing.

4. The centralized box-type secondary heating and primary hot water supply equipment for recovering waste heat from bathing as described in claim 1, characterized in that, The heat source of the secondary heating disposable bathing hot water equipment (14) is bathing wastewater. All bathing wastewater is collected in the sewage collection tank (1) and transported to the sewage inlet (5) of the secondary heating disposable bathing hot water equipment (14) through the submersible sewage pump (2), hair filter (3), and sand tank (4). It enters the sewage filter (9) for sewage filtration treatment. The treated sewage then enters the primary sewage heat exchanger (11) to exchange heat with tap water for the first time. The bathing wastewater exchanges heat here to cool down.

5. The centralized box-type secondary heating and primary hot water supply equipment for recovering waste heat from bathing as described in claim 4, characterized in that, After cooling, the bath wastewater enters the evaporator of the secondary bath wastewater large temperature difference special sewage source heat pump (12) for a second heat release. The temperature drops to below 5°C and is discharged into the sewer pipe through the equipment sewage outlet (16).

6. The centralized box-type secondary heating and primary hot water supply equipment for recovering waste heat from bathing as described in claim 1, characterized in that, An electric auxiliary heating device (13) is added to the outlet pipe of the condenser of the secondary bath wastewater large temperature difference special sewage source heat pump (12) as a supplementary heat source.

7. The centralized box-type secondary heating and primary hot water supply equipment for recovering waste heat from bathing as described in claim 1, characterized in that, The primary sewage heat exchanger (11) and the secondary bath wastewater large temperature difference special sewage source heat pump (12) both adopt a hinged door structure. When the equipment has been running for a period of time and scale buildup occurs, the valve can be closed and the hinged door structure can be opened to clean the inside of the equipment with a high-pressure water gun.

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