Shower heat recovery device

Abstract

The shower heat recovery device comprises a first heat exchange system, a second heat exchange system, a drainage system and a connecting pipe, the first heat exchange system comprises a heat exchange pipe, a bathroom floor and a floor drain, the heat exchange pipe is located on the lower side of the bathroom floor, and a water outlet of the heat exchange pipe is connected with a water inlet of the connecting pipe; the second heat exchange system comprises a large pipe, a small pipe, a shutoff ball valve and a water mixing valve, a water inlet of the large pipe is connected with the water outlet of the connecting pipe through the shutoff ball valve, a water outlet of the large pipe is connected with a cold water inlet of the water mixing valve, and the small pipe is integrally arranged in the large pipe. A water inlet of the small pipe is connected with a hot water inlet pipe, a water outlet of the small pipe is connected with a hot water outlet pipe, the hot water inlet pipe is connected with a water outlet of the water heater, the hot water outlet pipe is connected with a hot water inlet of the water mixing valve, and a water outlet of the water mixing valve is connected with the spray header. The device is simple and compact in structure, can be applied to a small space, and realizes simple and efficient recovery and utilization of the heat of the shower wastewater.

Description

Technical Field

[0001] The present invention belongs to the field of hot water heat recovery, and particularly relates to a shower heat recovery device. Background Art

[0002] Maintenance personnel in chemical plants take showers frequently. Each time they take a shower, a large amount of hot water is discharged into the sewage pipe, wasting a large amount of energy. On the other hand, in the pipeline from the water heater to the shower head, the hot water temperature is relatively high, and good thermal insulation materials are often required, resulting in high costs. Moreover, when the shower head is first turned on for use, there is often a period of time when the water temperature at the outlet is too low to be used, and there is a problem that the water at the front end of the shower head is too cold.

[0003] At present, most bathrooms do not recover the heat of the discharged hot water from showers. The reason is that some of the current heat recovery technologies use heat pumps for recovery. For example, the hot water recovery devices disclosed in Patent Nos. CN201120509477.4 and CN202111352001.9 have high configuration costs and are not suitable for popularization and application in small spaces. Some hot water recovery devices have poor heat recovery effects. For example, the bathroom heat recovery device disclosed in Patent No. CN200810162890.0 has no promotion value.

[0004] In addition, the currently disclosed bathroom heat recovery devices using heat pumps basically recover heat through a heat pump system after the hot water converges. For small-space bathrooms, this obviously requires a large investment. For occasions without a heat pump system configured, it is obviously not suitable either. Summary of the Invention

[0005] The technical problem to be solved by the present invention is, in view of the deficiencies of the prior art, to provide a shower heat recovery device with a simple, compact structure that can be applied to small spaces, which realizes simple and efficient recovery and utilization of the heat of shower wastewater, saves the discharge of ineffective cold water, and does not require thermal insulation measures for the pipeline between the water heater and the shower head, and achieves front-end water outlet heat preservation and heat recovery at low cost.

[0006] The technical solution adopted by the present invention to solve the above technical problems is as follows: A shower heat recovery device, characterized in that it includes a first heat exchange system, a second heat exchange system, a drainage system and a connecting pipe. The first heat exchange system includes a heat exchange pipe, a bathroom floor and a floor drain. The floor drain is installed on the bathroom floor. The drainage system is used to externally discharge the waste water collected by the floor drain. The heat exchange pipe is located under the bathroom floor. The water inlet of the heat exchange pipe is connected to an external cold water pipe, and the water outlet of the heat exchange pipe is connected to the water inlet of the connecting pipe. The water outlet of the connecting pipe is connected to the water inlet of the water heater. The second heat exchange system includes a large pipe, a small pipe, a shut-off ball valve and a mixing valve. The water inlet of the large pipe is connected to the water outlet of the connecting pipe through the shut-off ball valve. The water outlet of the large pipe is connected to the cold water inlet of the mixing valve. The small pipe is integrally arranged inside the large pipe. The water inlet of the small pipe is connected to a hot water inlet pipe, and the water outlet of the small pipe is connected to a hot water outlet pipe. The hot water inlet pipe seals through the pipe wall of the large pipe and is connected to the water outlet of the water heater. The hot water outlet pipe seals through the pipe wall of the large pipe and is connected to the hot water inlet of the mixing valve. The water outlet of the mixing valve is connected to a shower head through a connecting hose.

[0007] The shower heat recovery device of the present invention adopts two-stage heat recovery, that is, it recovers the heat energy of the waste water after shower through the first heat exchange system and transports it to the second heat exchange system for reuse. The second heat exchange system solves the problem that the water flowing out in front of the shower head is too cold, realizes simple and efficient recovery and utilization of the heat of the shower waste water, saves the discharge of ineffective cold water, and does not require heat preservation measures for the pipeline between the water heater and the shower head, and realizes the heat preservation of the water flowing out in front and heat recovery at low cost. The shower heat recovery device of the present invention has a simple and compact structure and can be applied to the shower heat recovery in small spaces, such as the shower rooms in chemical plants and family shower rooms.

[0008] In the shower heat recovery device of the present invention, the second heat exchange system adopts the method of a large pipe enclosing a small pipe. Cold water flows through the large pipe, and hot water flows through the small pipe. The cold water in the large pipe can fully exchange heat with the hot water in the small pipe during the water outlet process, preheating the cold water in the large pipe in advance, so that the temperature of the water sent into the mixing valve through the water outlet of the large pipe rises, and directly mixes with the hot water sent into the mixing valve through the hot water outlet pipe to form hot water at the required temperature, avoiding the disadvantage of cold water discharge. At the same time, the large pipe can replace the traditional heat preservation pipe to ensure the water outlet temperature of the shower head, thus effectively avoiding the problem of cold water discharge at the beginning of the shower.

[0009] Preferably, the floor drain is close to the water inlet of the heat exchange pipe to minimize heat energy loss and achieve full heat exchange.

[0010] In another embodiment, a sump is provided on the lower side of the bathroom floor, the bathroom floor covers the top of the sump, the heat exchange pipes are arranged in the sump, and the inlet of the drainage system is connected to the sump. The setting of the sump can further improve the heat recovery efficiency of the device.

[0011] Preferably, the drainage system includes an overflow pipe, a temperature sensor, a discharge main pipe, a discharge pipe, a solenoid valve and a temperature controller. One end of the overflow pipe is hermetically extended into the sump, the overflow outlet of the overflow pipe is a certain distance above the bottom of the sump, the other end of the overflow pipe is connected to the discharge main pipe, one end of the discharge pipe is connected to the lowest part of the sump, the other end of the discharge pipe is connected to the discharge main pipe through the solenoid valve, the temperature sensor is arranged in the discharge pipe, the temperature sensor is close to the connection part of the discharge pipe and the sump, the signal input line of the temperature controller is connected to the temperature sensor, and the control signal output line of the temperature controller is connected to the coil of the solenoid valve. When the temperature of the wastewater in the sump is lower than the set temperature, the temperature controller opens the solenoid valve, and discharges the wastewater with no recovery value whose temperature in the sump is lower than the set temperature through the discharge pipe and the discharge main pipe, ensuring the heat exchange effect of the second heat exchange system, and at the same time avoiding the growth of microorganisms due to the long-term accumulation of wastewater in the sump; when the temperature of the wastewater in the sump is higher than the set temperature, the temperature controller closes the solenoid valve, and the excess wastewater in the sump is discharged through the overflow pipe and the discharge main pipe, so as to ensure that the heat energy of the wastewater is fully exchanged by the inlet water of the heat exchange pipes in the sump and improve the heat recovery efficiency.

[0012] Preferably, the floor drain is close to the water outlet of the heat exchange pipe to ensure sufficient heat exchange of the first heat exchange system.

[0013] Preferably, the heat exchange pipes are arranged in a serpentine shape in the sump to increase the heat exchange area between the wastewater in the sump and the inlet water of the heat exchange pipes and further improve the heat exchange effect.

[0014] Preferably, the bathroom floor is openably covered on the top of the sump. The cover plate can be lifted to wash the sump to keep the bathroom clean.

[0015] Compared with the prior art, the present invention has the following advantages: The shower heat recovery device of the present invention adopts two-stage heat recovery, that is, the heat energy of the waste water after shower is recovered through the first heat exchange system and transported to the second heat exchange system for reuse. The second heat exchange system solves the problem of cold water at the front end of the shower head, realizing simple and efficient recovery and utilization of the heat of the shower waste water, saving the discharge of ineffective cold water, and eliminating the need for heat preservation measures for the pipeline between the water heater and the shower head, achieving front-end water temperature preservation and heat recovery at low cost. The shower heat recovery device of the present invention has a simple and compact structure and can be applied to the shower heat recovery in small spaces, such as chemical plant shower rooms and household shower rooms. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the composition of the shower heat recovery device in Embodiment 1;

[0017] Figure 2 It is a schematic diagram of the composition of the second heat exchange system in Embodiment 1;

[0018] Figure 3 It is a schematic diagram of the composition of the drainage system in Embodiment 1;

[0019] Figure 4 It is a schematic diagram of the composition of the shower heat recovery device in Embodiment 2;

[0020] The arrows in the figure indicate the water flow direction, and the specific reference numerals in the figure are as follows:

[0021] 1 - First heat exchange system, 11 - Heat exchange pipe, 12 - Bathroom floor, 13 - Floor drain, 14 - Water inlet of the heat exchange pipe, 15 - Water outlet of the heat exchange pipe, 2 - Second heat exchange system, 21 - Large pipe, 22 - Small pipe, 23 - Shut-off ball valve, 24 - Mixing valve, 25 - Hot water inlet pipe, 26 - Hot water outlet pipe, 27 - Water inlet of the large pipe, 28 - Water outlet of the large pipe, 3 - Drainage system, 31 - Overflow pipe, 32 - Temperature sensor, 33 - Discharge main pipe, 34 - Discharge pipe, 35 - Solenoid valve, 36 - Thermostat, 37 - Overflow port of the overflow pipe, 4 - Connecting pipe, 5 - Water heater, 6 - Sump, 71 - Connecting hose, 72 - Shower head. DETAILED DESCRIPTION OF THE INVENTION

[0022] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0023] The shower heat recovery device of Embodiment 1, as Figures 1 to 3As shown in the figure, it includes a first heat exchange system 1, a second heat exchange system 2, a drainage system 3 and a connecting pipe 4. The first heat exchange system 1 includes heat exchange pipes 11, a bathroom floor 12 and a floor drain 13. The floor drain 13 is installed on the bathroom floor 12. The drainage system 3 is used to drain the waste water collected by the floor drain 13. The heat exchange pipes 11 are located on the lower side of the bathroom floor 12. The water inlet 14 of the heat exchange pipes 11 is connected to an external cold water pipe. The floor drain 13 is close to the water outlet 15 of the heat exchange pipes 11. The water outlet 15 of the heat exchange pipes 11 is connected to the water inlet of the connecting pipe 4. The water outlet of the connecting pipe 4 is connected to the water inlet of a water heater 5. The second heat exchange system 2 includes a large pipe 21, a small pipe 22, a shut-off ball valve 23 and a mixing valve 24. The water inlet 27 of the large pipe 21 is connected to the water outlet of the connecting pipe 4 through the shut-off ball valve 23. The water outlet 28 of the large pipe 21 is connected to the cold water inlet of the mixing valve 24. The small pipe 22 is integrally arranged inside the large pipe 21. The water inlet of the small pipe 22 is connected to a hot water inlet pipe 25. The water outlet of the small pipe 22 is connected to a hot water outlet pipe 26. The hot water inlet pipe 25 is sealed through the pipe wall of the large pipe 21 and connected to the water outlet of the water heater 5. The hot water outlet pipe 26 is sealed through the pipe wall of the large pipe 21 and connected to the hot water inlet of the mixing valve 24. The water outlet of the mixing valve 24 is connected to a shower head 72 through a connecting hose 71.

[0024] In Embodiment 1, a sump 6 is provided on the lower side of the bathroom floor 12. The bathroom floor 12 is openably covered on the top of the sump 6. The heat exchange pipes 11 are arranged in a serpentine shape in the sump 6. The inlet of the drainage system 3 is connected to the sump 6.

[0025] In Embodiment 1, the drainage system 3 includes an overflow pipe 31, a temperature sensor 32, a discharge main pipe 33, a discharge pipe 34, a solenoid valve 35 and a thermostat 36. One end of the overflow pipe 31 is hermetically inserted into the sump 6. The overflow port 37 of the overflow pipe 31 is a certain distance above the bottom of the sump 6. The other end of the overflow pipe 31 is connected to the discharge main pipe 33. One end of the discharge pipe 34 is connected to the lowest part of the sump 6. The other end of the discharge pipe 34 is connected to the discharge main pipe 33 through the solenoid valve 35. The temperature sensor 32 is arranged in the discharge pipe 34. The temperature sensor 32 is close to the connection part of the discharge pipe 34 and the sump 6. The signal input line of the thermostat 36 is connected to the temperature sensor 32. The control signal output line of the thermostat 36 is connected to the coil of the solenoid valve 35.

[0026] When a shower is needed, first manually open the shut-off ball valve 23, and then open the mixing valve 24. At this time, the tap cold water in the connecting pipe 4 is divided into two streams. One stream flows through the shut-off ball valve 23 and enters the large pipe 21, and the other stream enters the water heater 5. Through the water pressure of the tap water, the hot water in the water heater 5 is sent into the small pipe 22 via the hot water inlet pipe 25. The hot water in the small pipe 22 exchanges heat with the cold water in the large pipe 21, preheating the cold water in the large pipe 21 in advance, so that the temperature of the water sent into the mixing valve 24 through the water outlet 28 of the large pipe 21 increases, and directly mixes with the hot water sent into the mixing valve 24 through the hot water outlet pipe 26 to form hot water at the required temperature, avoiding the drawback of cold water discharge. At the same time, the large pipe 21 can replace the traditional heat preservation pipe to ensure the water outlet temperature of the shower head 72, thus effectively avoiding the problem of cold water discharge at the beginning of the shower.

[0027] When starting a shower, the shower wastewater enters the sump 6 from the floor drain 13 on the shower floor. At this time, the temperature of the wastewater in the sump 6 is not high, and the solenoid valve 35 is opened. The wastewater in the sump 6 flows through the discharge pipe 34, the solenoid valve 35 and enters the main discharge pipe 33 and is discharged outward. As the shower progresses, when the temperature sensor 32 detects that the temperature of the wastewater in the sump 6 reaches the set temperature, the temperature sensor 32 closes the solenoid valve 35, thereby closing the discharge pipe 34. Thereafter, the shower wastewater temporarily converges in the sump 6. The tap cold water from the external cold water pipe enters the heat exchange pipe 11 from the water inlet 14 of the heat exchange pipe 11, exchanges heat with the hot wastewater in the sump 6, and after the first heat recovery, enters the connecting pipe 4 from the water outlet 15 of the heat exchange pipe 11, and then enters the second heat exchange system 2 and the water heater 5 respectively to complete the second heat recovery in the second heat exchange system 2. As the hot wastewater in the sump 6 increases, when the water depth exceeds the height of the overflow port 37, the hot wastewater enters the overflow pipe 31 through the overflow port 37 and is discharged outward through the main discharge pipe 33. When the temperature of the wastewater in the sump 6 is lower than the set temperature after exchanging heat with the first heat exchange pipe 11, the thermostat 36 opens the solenoid valve 35, and discharges the wastewater in the sump 6 through the discharge pipe 34 and the main discharge pipe 33.

[0028] The shower heat recovery device of Embodiment 2 is different from that of Embodiment 1 in that, as Figure 4 shown, in Embodiment 2, the sump is cancelled, and a simplified drainage system 3 is adopted, and the floor drain 13 is close to the water inlet 14 of the heat exchange pipe 11 to discharge the wastewater after the shower in time. In Embodiment 2, the first heat exchange system 1 only recovers the heat energy dissipated by the bathroom floor 12. Although the heat recovery efficiency of the shower heat recovery device in Embodiment 2 is lower than that in Embodiment 1, the structure of the shower heat recovery device in Embodiment 2 is relatively simpler, the cost is lower, and the flushing operation of the sump is avoided.

Claims

1. A shower heat recovery device, characterized in that, It includes a first heat exchange system, a second heat exchange system, a drainage system and connecting pipes. The first heat exchange system includes heat exchange pipes, a bathroom floor and a floor drain. The floor drain is installed on the bathroom floor. The drainage system is used to externally discharge the wastewater collected by the floor drain. The heat exchange pipes are located on the lower side of the bathroom floor. The water inlet of the heat exchange pipes is connected to an external cold water pipe. The water outlet of the heat exchange pipes is connected to the water inlet of the connecting pipes. The water outlet of the connecting pipes is connected to the water inlet of a water heater. The second heat exchange system includes a large pipe, a small pipe, a shut-off ball valve and a mixing valve. The water inlet of the large pipe is connected to the water outlet of the connecting pipes through the shut-off ball valve. The water outlet of the large pipe is connected to the cold water inlet of the mixing valve. The small pipe is entirely arranged inside the large pipe. The water inlet of the small pipe is connected to a hot water inlet pipe. The water outlet of the small pipe is connected to a hot water outlet pipe. The hot water inlet pipe penetrates through the pipe wall of the large pipe in a sealed manner and is connected to the water outlet of the water heater. The hot water outlet pipe penetrates through the pipe wall of the large pipe in a sealed manner and is connected to the hot water inlet of the mixing valve. The water outlet of the mixing valve is connected to a shower head through a connecting hose.

2. The shower heat recovery device according to claim 1, characterized in that, The floor drain is close to the water inlet of the heat exchange pipes.

3. The shower heat recovery device according to claim 1, wherein, A sump is provided on the lower side of the bathroom floor. The bathroom floor covers the top of the sump. The heat exchange pipes are arranged in the sump. The inlet of the drainage system is connected to the sump.

4. A shower heat recovery device according to claim 3, characterized in that, The drainage system includes an overflow pipe, a temperature sensor, a discharge main pipe, a discharge pipe, a solenoid valve and a temperature controller. One end of the overflow pipe extends into the sump in a sealed manner. The overflow opening of the overflow pipe is a certain distance above the bottom of the sump. The other end of the overflow pipe is connected to the discharge main pipe. One end of the discharge pipe is connected to the lowest point of the sump. The other end of the discharge pipe is connected to the discharge main pipe through the solenoid valve. The temperature sensor is arranged in the discharge pipe and is close to the connection between the discharge pipe and the sump. The signal input line of the temperature controller is connected to the temperature sensor. The control signal output line of the temperature controller is connected to the coil of the solenoid valve. When the temperature of the wastewater in the sump is lower than the set temperature, the temperature controller opens the solenoid valve to discharge the wastewater in the sump through the discharge pipe and the discharge main pipe. When the temperature of the wastewater in the sump is higher than the set temperature, the temperature controller closes the solenoid valve, and the excess wastewater in the sump is discharged through the overflow pipe and the discharge main pipe.

5. The shower heat recovery device according to claim 4, wherein The floor drain is close to the water outlet of the heat exchange pipes.

6. The shower heat recovery device according to claim 3, characterized in that, The heat exchange pipes are arranged in a serpentine shape in the sump.

7. The shower heat recovery device according to claim 3, characterized in that, The bathroom floor covers the top of the sump in an openable manner.

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