Energy-saving bathing device capable of relieving pressure

Abstract

The utility model discloses an energy-saving bathing device capable of relieving pressure, which belongs to the technical field of bathing and comprises a water using device, a water storage module, a waste heat recovery device and a water heater, the water using device is connected with one end of the water heater, the water storage module and the water heater form a circulating water path, and the waste heat recovery device is connected with the water heater. One end of the waste heat recovery device is connected with a water inlet, the other end of the waste heat recovery device is connected with the water storage module, one end of the circulating water pump is connected with the water outlet end of the water storage module, and the other end of the circulating water pump is connected with the water heater; and one end of the pressure relief water path is connected with a pipeline between the waste heat recovery device and the water inlet, and the other end of the pressure relief water path is connected with the water outlet, so that the functions of hot water storage, internal circulation preheating and pressure relief in the water path are realized.

Description

Technical Field

[0001] The utility model relates to the technical field of bathing, in particular to an energy-saving bathing device with pressure relief function. Background Art

[0002] At present, the commonly used household bathing equipment on the market generally includes a storage water heater and an instant water heater. As is well known, the ordinary storage water heater has the defects of large volume, long heating waiting time and low safety. For example, it takes about 2 hours to heat a 50-liter water heater, and during the use process, due to continuous replenishment of cold water, the water temperature will drop, and it is difficult to maintain the temperature. The instant water heater has a fast heating speed, but it also has the following defects: high power, generally more than 8KW, while the ordinary household power configuration is 10 / 40A. When in use, other electrical appliances cannot work properly, and when used at low ambient temperature, there may also be a problem that the temperature rise cannot meet the use requirements.

[0003] A patent application with the application number 202010488748.6 submitted by the utility model person earlier discloses a bathing system, including a hot water generator, a bathing device and a heat energy recovery device. The bathing device includes a mixing valve and a bathing shower head. The hot water generator includes a short-range water heater and a long-range water heater. The main function is to provide bathing water with a relatively high water temperature for the bathing shower head, and then preheat the cold water that needs to enter the mixing valve or the cold water at the water inlet end of the short-range water heater through the heat energy recovery device arranged directly below the bathing shower head, so as to achieve the purpose of recovering the heat energy of the bathing water and reducing energy consumption. However, during the process of recovering the residual heat of the water flow, the water heater and the water storage tank are prone to sudden stops of the water flow, and the water heater is prone to local high temperature and damage.

[0004] A patent application with the application number 202020985443.1 submitted by the utility model person earlier discloses a bathing waste water heat exchange device with good heat energy recovery effect. A heat exchange tube assembly and a heat exchange plate are also arranged between the base and the face cover of the heat exchange device. The heat exchange plate includes two heat exchange fins. A distance is maintained between the two heat exchange fins, and the circumferential edges of the two are closed to form a heat exchange cavity. A number of heat exchange bumps are arranged on both of the two heat exchange fins. The heat exchange bumps are recessed from the outer surface of the heat exchange fins into the heat exchange cavity. An inlet connection port and an outlet connection port are arranged on the heat exchange plate. The inlet connection port is connected to the water outlet end of the heat exchange pipeline, and the outlet connection port is connected to the outlet water pipe. In order to ensure a sufficient heat exchange rate, the heat exchange fins should be made as thin as possible, which will inevitably lead to a decrease in the pressure-bearing capacity of the heat exchange fins. Due to the limited pressure-bearing capacity of the heat exchange fins, if the water pressure is always maintained in the heat exchange cavity between the two heat exchange fins during long-term use, the stability of the connection between the two heat exchange fins will be affected, resulting in water leakage at the heat exchange plate after long-term use and reducing the service life of the heat exchange plate.

[0005] The existing patent application with the publication number CN204146925U discloses a bathing energy-saving and water-saving system, including a shower head water supply pipe, a shower head arranged at one end of the shower head water supply pipe, a cold and hot mixing control valve arranged at the other end of the shower head water supply pipe. The cold water inlet of the cold and hot mixing control valve, namely the heat exchange warm water port B, is connected to the outlet of the heat preservation box through a pipe. One end of the main heat exchange plate is connected to the inside of the outlet, the other end of the main heat exchange plate is connected to one end of the secondary heat exchange pipe, the other end of the secondary heat exchange pipe is connected to the water inlet, the water inlet is connected to the primary preheating water inlet pipe, the primary preheating water inlet pipe is connected to the primary heat exchanger and the water supply pipe, and the water supply pipe is connected to the water outlet C of the tap water. When the bathing energy-saving and water-saving system recovers and utilizes heat energy, its water heater is prone to overheating due to the sudden stop of water flow, having a certain potential safety hazard. Utility Model Content

[0006] The purpose of the present utility model is to provide a pressure-relievable energy-saving bathing device, which solves the problem that the existing pressure-relievable energy-saving bathing device is easily damaged by internal components under the action of water flow pressure.

[0007] To achieve the above-mentioned utility model purpose, the technical solution adopted by the present utility model is as follows:

[0008] A pressure-relievable energy-saving bathing device includes a water-using device, a water storage module, a waste heat recovery device and a water heater. The water-using device is connected to one end of the water heater, the water storage module and the water heater form a circulating water path, one end of the waste heat recovery device is connected to the water inlet, and the other end is connected to the water storage module. It further includes a circulating water pump and a pressure-relief water path. One end of the circulating water pump is connected to the water outlet end of the water storage module, and the other end of the circulating water pump is connected to the water heater. One end of the pressure-relief water path is connected to the pipeline between the waste heat recovery device and the water inlet, and the other end is connected to the water outlet, realizing the functions of hot water storage, internal circulation preheating and pressure relief inside the water path.

[0009] Further, it also includes a third valve and a flow meter. The third valve is connected to the flow meter, and the third valve and the flow meter are arranged between the water heater and the water-using device.

[0010] Further, it also includes a first valve. The first valve is arranged between the water inlet and the waste heat recovery device for supplementing water from the water inlet. The flow meter is linked with the first valve to control the water supply state of the water-using device, detect the output water flow, and control the opening and closing of the first valve and external water supply according to the signal of the flow meter.

[0011] Further, a second valve is arranged in the pressure-relief water path. The second valve is used to relieve the water pressure in the pipeline of the bathing system in the closed state.

[0012] Furthermore, the second valve is linked with the first valve. The second valve closes after the third valve is opened, and opens for a certain period of time and then closes after the first valve is closed.

[0013] More preferably, an electric shock prevention wall is further included. The electric shock prevention wall is arranged between the water heater and the water-using device and is used to prevent electric shock caused by electric leakage into the water.

[0014] More preferably, a fourth valve, a first check valve and a second check valve are further included. The fourth valve is connected with the first check valve, and the fourth valve and the first check valve are arranged between the water-using device and the water storage module. The second check valve is arranged between the water outlet end of the waste heat recovery device and the water storage module and is used for the water circulation between the water storage module and the water heater to realize internal circulation preheating and water storage.

[0015] Furthermore, a first temperature sensor and a second temperature sensor are further included. The first temperature sensor is arranged at the water inlet end of the waste heat recovery device, and the second temperature sensor is arranged at the water outlet end of the waste heat recovery device and is used to detect the water state of the waste heat recovery device.

[0016] Preferably, a third temperature sensor, a fourth temperature sensor and a fifth temperature sensor are further included. The third temperature sensor is arranged inside the water storage module, the fourth temperature sensor is arranged at the water inlet end of the water heater, and the fifth temperature sensor is arranged at the water outlet end of the water heater and is used to control the temperature of the output hot water and control the water heater to dynamically adjust the temperature of the supplied hot water.

[0017] Furthermore, a water flow switch is further included. The water flow switch is arranged between the circulation water pump and the water heater and is used to control the water supply flow of the internal circulation, ensure the stable water supply volume and prevent the water heater from dry burning.

[0018] The beneficial effects of the utility model are as follows:

[0019] (1) The pressure-relievable energy-saving shower device is provided with a waste heat recovery device and a circulating water path formed by a water heater and a water storage module, which can make full use of the heat in the used wastewater to preheat the cold water entering the water storage module, playing an energy-saving role. A circulating water pump and a pressure-relief water path are arranged between the water outlet end of the water storage module and the water heater. The circulating water pump can send hot water into the water heater, and the pressure-relief water path can discharge the water inside the water path to the outside when the internal circulating water path fails, preventing internal blockage and damage caused by excessive pressure, improving the safety of the shower system. It can also discharge the pressurized water inside the loop to the outside when the hot water is no longer used, playing a role in protecting the components inside the water path when it is closed, especially protecting the heat exchange plate of the waste heat recovery device, preventing the heat exchange plate of the waste heat recovery device from still bearing a large water pressure when the shower system is in the closed state, and thus improving the service life of the heat exchange plate;

[0020] (2) A water flow switch is arranged between the circulating water pump and the water heater of the pressure-relievable energy-saving shower device. The water flow switch can control the water flow rate of the circulating preheating. Through the circulating water pump, internal circulation preheating between the water heater and the water storage module can be realized. Different internal circulation preheating temperatures can be selected according to the room temperature, further improving the utilization efficiency of heat. The water flow switch can also ensure the stable water flow in the water heater, prevent local water shortage and dry burning of the water heater caused by sudden stop, and improve the service life and safety of the water heater. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a composition diagram of the pressure-relievable energy-saving shower device provided by the present utility model;

[0022] REFERENCE NUMERALS:

[0023] 1. Waste heat recovery device; 2. Water heater; 21. Flowmeter; 22. Third valve; 23. Fourth valve; 24. First one-way valve; 3. Water inlet; 31. First valve; 32. Second valve; 33. Water purifier; 34. First temperature sensor; 35. Second temperature sensor; 36. Second one-way valve; 37. Water outlet; 4. Water storage module; 41. Third temperature sensor; 42. Water flow switch; 43. Fourth temperature sensor; 44. Fifth temperature sensor; 5. Circulating water pump; 6. Water using device; 61. Shower head; 62. Back spray; 63. Overhead shower; 7. Electric shock prevention wall. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

[0025] Example 1

[0026] As Figure 1 shown, this embodiment discloses an energy-saving shower device with pressure relief, which includes a water-using device 6, a water storage module 4, a waste heat recovery device 1, and a water heater 2. One end of the water-using device 6 is connected to the water heater 2. The water storage module 4 and the water heater 2 form a circulating water path, which connects the water outlet end of the water storage module 4 and the water inlet end of the water heater 2, and the water outlet end of the water heater 2 and the water inlet end of the water storage module 4. The water storage module 4 sends hot water into the water heater 2 through the circulating water path, and the water in the water heater 2 can flow back to the water storage module 4 for reheating. One end of the waste heat recovery device 1 is connected to the water inlet 3, and the other end is connected to the water storage module 4. It also includes a circulating water pump 5 and a pressure relief water path. One end of the circulating water pump 5 is connected to the water outlet end of the water storage module 4. One end of the pressure relief water path is connected to the pipeline between the waste heat recovery device 1 and the water inlet 3, and the other end is connected to the water outlet 37, which is used to relieve the pressure in the water path and prevent the internal components of the water path from being damaged by water pressure.

[0027] Preferably, the water-using device 6 includes a changeover switch, a shower head 61, a back spray 62, and an overhead shower 63. The water inlet end of the changeover switch is connected to the water heater 2, and the other three ends are respectively connected to the shower head 61, the back spray 62, and the overhead shower 63, which are used to supply water to different shower appliances respectively. Switching the changeover switch can control the specific spraying direction of hot water after the third valve 22 is opened, which is convenient for users to rinse comprehensively.

[0028] Furthermore, it also includes an anti-electricity wall 7, which is arranged between the water heater 2 and the water-using device 6, used to increase the resistance of the hot water supplied to the water-using device 6, prevent the water flow from being charged and causing electric shock to the human body after the system leaks electricity, and improve the water use safety.

[0029] Preferably, it also includes a third valve 22 and a flow meter 21. The third valve 22 is connected to the flow meter 21, and the third valve 22 and the flow meter 21 are arranged between the anti-electricity wall 7 and the water-using device 6.

[0030] The waste heat recovery device 1 preheats the cold water entering the water storage module 4 from the outside by recovering the used waste hot water, and improves the heat utilization rate through waste heat exchange. The heat exchange plate at the core part of the waste heat recovery device 1 is relatively thin and is prone to deformation and cracking under long-term water pressure or impact. It is necessary to relieve the sudden pressure existing in the water circuit, and it is necessary to avoid a large water pressure still existing in the inner cavity of the heat exchange plate when the bathing system is in the closed state, so as to ensure the stability and service life of the waste heat recovery device 1. Therefore, further, this embodiment further includes a pressure relief water circuit and a first valve 31. The first valve 31 is arranged between the water inlet 3 and the waste heat recovery device 1. One end of the pressure relief water circuit is connected to the first valve 31, and the other end is connected to the water outlet 37. The pressure relief water circuit includes a second valve 32. One end of the second valve 32 is connected to the first valve 31, and the other end is connected to the water outlet 37. The first valve 31 can be opened when the internal water circuit is abnormal or when internal drainage is required, which plays a role in protecting the internal water circuit. More specifically, after the third valve 22 and the first valve 31 of the waste heat recovery device 1 close the water circuit, it will expand under the continuous action of hot water. At this time, the pressure in the waste heat recovery device 1 is discharged through the pressure relief water circuit, which plays a role in protecting the waste heat recovery device 1 and improving the service life.

[0031] The flowmeter 21 is linked with the first valve 31. The third valve 22 is a rotary water valve (the rotation opening and closing angle can adjust the water flow rate). After the third valve 22 is opened, when the flowmeter 21 detects a water flow signal, the first valve 31 is synchronously opened. When the water flow signal is lost in the flowmeter 21, the first valve 31 is closed, which is used to ensure the stability of the internal water supply. The third valve 22 is used to control the water supply state of the water using device 6. In addition, the flowmeter 21 is used to count the water consumption of the water using device 6 and judge whether the water use is in a normal state. The abnormal state of the water supply can be judged through water volume measurement. The third valve 22, the water storage module 4 and the circulation pump 5 of the energy-saving bathing device with pressure relief can be actively disconnected, which plays a role in protecting the user.

[0032] The second valve 32 is linked with the first valve 31. The second valve 32 is a normally closed solenoid valve. It is closed after the third valve 22 is opened and opened for a certain time and then closed after the third valve 22 is closed. Specifically, since the first valve 31 is closed when the water flow signal is lost in the flowmeter 21 after the third valve 22 is closed, and since there is still water pressure in the pipeline of the bathing system after the first valve 31 is closed, especially between the water inlet and the waste heat recovery device and in the waste heat recovery device, therefore, the second valve 32 can be opened for several seconds (specifically, it can be set to 3 to 10 seconds) and then closed after the third valve 22 is closed, so as to realize pressure relief through the pressure relief water circuit and protect the components inside the water circuit from the influence of sudden water pressure. In particular, the heat exchange plate at the vulnerable core part of the waste heat recovery device 1 is not under pressure when the bathing system is closed.

[0033] Preferably, it further includes a fourth valve 23, a first check valve 24 and a second check valve 36. The fourth valve 23 is connected to the first check valve 24, and the fourth valve 23 and the first check valve 24 are arranged between the water-using device 6 and the water storage module 4. The second check valve 36 is arranged between the water outlet end of the waste heat recovery device 1 and the water storage module 4. The second check valve 36 is used to prevent the reverse flow of water, resulting in water shortage in the water storage module 4. The fourth valve 23 is used to control the circulating heating of water, and the first check valve 24 is used to prevent the water in the water heater 2 from flowing back to the water storage module 4.

[0034] More preferably, it further includes a first temperature sensor 34 and a second temperature sensor 35. The first temperature sensor 34 is arranged at the water inlet end of the waste heat recovery device 1, and the second temperature sensor 35 is arranged at the water outlet end of the waste heat recovery device 1. The first temperature sensor 34 is used to detect the temperature of the incoming cold water, and the second temperature sensor 35 is used to detect the water temperature after passing through the waste heat recovery device 1.

[0035] More preferably, it further includes a third temperature sensor 41, a fourth temperature sensor 43 and a fifth temperature sensor 44. The third temperature sensor 41 is arranged in the water storage module 4 for detecting the temperature of the stored water. The fourth temperature sensor 43 is arranged at the water inlet end of the water heater 2, and the fifth temperature sensor 44 is arranged at the water outlet end of the water heater 2. The fourth temperature sensor 43 is used to detect the temperature of the hot water entering the water heater 2, and the fifth temperature sensor 44 is used to detect the temperature of the flowing water entering the water-using device 6, so as to accurately control the water temperature and the heating or preheating time of the water heater 2. The bathing system detects the temperature of the water entering the water heater 2 and the temperature of the water flowing out of the water heater 2. When the temperature of the flowing hot water meets the use requirements and the outflow temperature is close to the inflow temperature, the water heater 2 stops heating, and the circulating water pump 5 is used for water replenishment. After the temperature difference between the flowing hot water and the incoming hot water is greater than a certain value, the water heater 2 starts to heat the water flow. By detecting the temperature difference between the outflow and inflow hot water, the working state of the water heater 2 during continuous heating is controlled, playing a role in accurately adjusting the water temperature and saving energy.

[0036] More preferably, it further includes a water purifier 33. The water purifier 33 is arranged between the water inlet 3 and the waste heat recovery device 1. The water purifier 33 is used to purify the water entering the waste heat recovery device 1 from the outside to remove impurities and particulate matters, preventing the waterway from being blocked after long-term use.

[0037] Further, it further includes a water flow switch 42. The water flow switch 42 is arranged between the circulating water pump 5 and the water heater 2. The other end of the circulating water pump 5 is connected to the water heater 2. The water flow state between the water storage module 4 and the water heater 2 is actively controlled by the circulating water pump 5 to control the outlet pressure and improve the stability of the water outlet of the water circuit. It can also prevent the water heater 2 from dry burning due to local water shortage caused by frequent start and stop, improving the safety of using the water heater 2. The water flow switch 42 can control the amount of water passing through to ensure the heating efficiency of the water.

[0038] The working process of the pressure-relievable energy-saving bathing device is as follows:

[0039] Taking hot water: Open the water flow switch 42 and the third valve 22, start the water heater 2 and the circulating water pump 5. The water is injected into the water heater 2 after passing through the water storage module 4, and then sprays out from the water heater 2 through the flow meter 21 by the water using device 6; Stopping hot water supply: Close the third valve 22 and the water flow switch 42, and turn off the water heater 2 and the circulating water pump 5; Preheating: When the third temperature sensor 41 in the water storage module 4 detects that the temperature is lower than the set temperature and the time when the flow meter 21 does not receive a water flow signal is greater than 5 minutes, the third valve 22 and the water flow switch 42 are opened, and the circulating water pump 5 and the water heater 2 are started to circulate and preheat the water; Internal circulation heating: The hot water flows back to the water storage module 4 through the electric shock prevention wall 7, the fourth valve 23 and the first one-way valve 24, and is then sent into the water heater 2 by the circulating water pump 5 to achieve internal circulation heating. When the third temperature sensor 41 in the water storage module 4 detects that the temperature reaches the set temperature, the water heater 2 stops heating, and the circulating water pump 5 stops running after a certain time lag, and the fourth valve 23 is closed.

[0040] The pressure-relievable energy-saving bathing device in this embodiment can implement an intelligent voice bathing control method, which specifically includes the following steps:

[0041] S1. Start bathing, open the third valve 22 and the water using device 6. The water storage module 4 and the circulating water pump 5 start to work. The water flows from the water inlet 3 through the waste heat recovery device 1 and flows through the water storage module 4. After the water storage module 4 heats the water, it is transported to the water using device 6 by the circulating water pump 5. The hot water flows out from the water using device 6. After the third valve 22 is opened, the hot water passes through the flow meter 21. The flow meter 21 transmits the water volume signal to the first valve 31, and the first valve 31 is synchronously opened to supplement the external water source to the water circuit system. When the third valve 22 is closed, the flow meter 21 loses the water volume signal, and the first valve 31 is synchronously closed to cut off the external water inlet;

[0042] S1.1, preheating mode, when the water in the water storage module 4 needs to be preheated, the fourth valve 23 is opened, the circulating water pump 5 and the water heater 2 start working, and the circulating water pump 5 pumps the water stored in the water storage module 4 to the water heater 2 for reheating until the circulated heated water reaches the set temperature. The solid line part in the figure represents the flow route of the external water supply, and the dotted line part represents the internal circulation flow route of the internal hot water;

[0043] S1.2, when setting the preheating mode temperature, it changes according to the ambient temperature. In the summer when the temperature is higher, the set temperature is lower than the winter temperature, and the set temperature is a fixed value higher than the ambient temperature;

[0044] Before S2, the third valve 22 is first opened to allow hot water to flow out of the water heater 2 through the water-using device 6, and the second valve 32 is opened synchronously to start water intake from the outside. After the flow meter 21 detects the water flow, the screen of the bathing system displays the "Welcome" icon, and the bathing time parameters are set on the screen;

[0045] S2, set the bathing time, manually set the bathing time and start the voice prompt assistant, after the bathing time reaches the set time, the voice prompt assistant will give a voice prompt to confirm whether the user continues to bathe, if the user replies to confirm, the water device 6 will continue to discharge water, and repeat the voice prompt after a certain period of time, if the user answers no or does not receive a reply within a certain period of time, the water device 6, the circulating water pump 5 and the water storage module 4 will be turned off;

[0046] S3, if the user does not receive a reply within a certain period of time, but still receives a water flow signal, the voice prompt assistant will sound a warning, and shut down the water device 6, the circulating water pump 5 and the water storage module 4 to enter the safety mode;

[0047] S4. After the warning sound is triggered, the safety mode needs to be manually released so that the pressure-relieving energy-saving shower device can work again.

[0048] S5, stop bathing. When the set time is reached or the third valve 22 is actively operated to close the water device 6, the flow meter 21 detects that the water flow disappears, and the first valve 31 is closed. At this time, the second valve 32 in the pressure relief water circuit is opened, and the waste heat recovery device 1 is heated by the waste hot water. The water therein expands due to the heat and is discharged outward through the second valve 32 in the pressure relief water circuit. After the second valve 32 is opened for a period of time, the pressure is released and then it is automatically closed to ensure the airtightness of the water circuit.

[0049] S5.1. The water heater 2 heats the water flowing through it normally. After stopping bathing or preheating, the water heater 2 stops heating first. After a period of time, the circulating water pump 5 stops working to ensure the continuity of the water flow in the water heater 2 and prevent the water heater 2 from being damaged due to sudden heating due to local lack of water.

[0050] More specifically, after the water-using device 6 has been continuously sprayed for a preset time, the voice assistant gives a voice prompt, such as playing the voice "Hello! You have used the shower device for some time. If you continue to use it, please reply 'Yes', and I will continue to serve you", and displays a field on the screen. The voice prompt sound is continuously sent 5 times. If the voice "Yes" is received, the questioning stops, and hot water is continuously supplied. After the water supply reaches the preset time, the above steps are repeated until a stop instruction is received; if no reply instruction is received after continuously sounding 5 times, the first valve 31 is powered off and closed, the water supply outside stops, the water-using device 6 stops discharging water, the water storage module 4 stops heating, and the circulation pump 5 stops running. At this time, if the third valve 22 is still in the open state, it is an abnormal state, and the safety bell is automatically triggered, that is, a distress message is sent to the mobile phone or the bound external terminal, and at the same time, there is a warning sound and the screen displays the graphic text field of "Timely rescue". After manually confirming the safety of the shower system, clicking on the screen can cancel the safety mode, the first valve 31 and the circulation pump 5 are opened, and the tap water enters the water storage module 4 again. After the water-using device 6 can discharge water normally, the third valve 22, the circulation pump 5, and the water heater 2 are closed.

[0051] According to the disclosure and teaching of the above specification, those skilled in the art of the present invention can also make changes and modifications to the above embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the present invention should also fall within the protection scope of the claims of the present invention. In addition, although some specific terms are used in this specification, these terms are only for convenience of description and do not constitute any limitation to the present invention.

Claims

1. A pressure-relieving energy-saving bathing device, comprising a water-using device (6), a water storage module (4), a waste heat recovery device (1) and a water heater (2), wherein the water-using device (6) is connected to one end of the water heater (2), the water storage module (4) and the water heater (2) form a circulating water circuit, one end of the waste heat recovery device (1) is connected to a water inlet (3), and the other end is connected to the water storage module (4), characterized in that: It also includes a circulating water pump (5) and a pressure relief water circuit, wherein one end of the circulating water pump (5) is connected to the water outlet end of the water storage module (4), and the other end of the circulating water pump (5) is connected to the water heater (2); one end of the pressure relief water circuit is connected to the pipeline between the waste heat recovery device (1) and the water inlet (3), and the other end is connected to the water outlet (37).

2. The energy-saving bathing device capable of pressure relief according to claim 1, characterized in that: It also comprises a third valve (22) and a flow meter (21), wherein the third valve (22) and the flow meter (21) are connected, and the third valve (22) and the flow meter (21) are arranged between the water heater (2) and the water-using device (6).

3. The energy-saving bathing device capable of pressure relief according to claim 2, characterized in that: It also comprises a first valve (31), wherein the first valve (31) is arranged between the water inlet (3) and the waste heat recovery device (1), and the flow meter (21) is linked to the first valve (31).

4. The energy-saving bathing device capable of pressure relief according to claim 3 is characterized in that: A second valve (32) is provided in the pressure relief water circuit, and the second valve (32) is used to relieve the water pressure in the pipeline of the bathing system which is in a closed state.

5. The energy-saving bathing device capable of pressure relief according to claim 4, characterized in that: The second valve (32) is linked to the first valve (31).

6. The energy-saving bathing device capable of pressure relief according to claim 4, characterized in that: It also comprises an anti-electricity wall (7), wherein the anti-electricity wall (7) is arranged between the water heater (2) and the water-using device (6).

7. The energy-saving bathing device capable of pressure relief according to claim 6, characterized in that: It also includes a fourth valve (23), a first one-way valve (24) and a second one-way valve (36), wherein the fourth valve (23) and the first one-way valve (24) are connected, and the fourth valve (23) and the first one-way valve (24) are arranged between the water-using device (6) and the water storage module (4), and the second one-way valve (36) is arranged between the water outlet end of the waste heat recovery device (1) and the water storage module (4).

8. The energy-saving bathing device capable of pressure relief according to claim 7, characterized in that: It also includes a first temperature sensor (34) and a second temperature sensor (35), wherein the first temperature sensor (34) is arranged at the water inlet end of the waste heat recovery device (1), and the second temperature sensor (35) is arranged at the water outlet end of the waste heat recovery device (1).

9. The energy-saving bathing device capable of pressure relief according to claim 8, characterized in that: It also includes a third temperature sensor (41), a fourth temperature sensor (43) and a fifth temperature sensor (44), wherein the third temperature sensor (41) is arranged in the water storage module (4), the fourth temperature sensor (43) is arranged at the water inlet end of the water heater (2), and the fifth temperature sensor (44) is arranged at the water outlet end of the water heater (2).

10. The energy-saving bathing device capable of pressure relief according to any one of claims 1 to 9, characterized in that: It also includes a water flow switch (42), which is arranged between the circulating water pump (5) and the water heater (2).

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