Heat exchange type electric water heater

Abstract

The utility model relates to a heat exchange type electric water heater which comprises a box body, a water tank pressure relief pipe is arranged on the box body, an energy gathering cover, an outer coil pipe, an inner coil pipe and a heating body are arranged in the box body, the outer coil pipe is located on the outer side of the energy gathering cover, the inner coil pipe and the heating body are located in the energy gathering cover, and one end of the outer coil pipe is communicated with the inner coil pipe. One end of the inner coil pipe is communicated with a hot water outlet end of the box body; liquid enters the outer coil pipe from the cold water inlet end of the box body and exchanges heat with liquid in the box body, and the liquid entering the outer coil pipe is heated in the first section. The liquid enters the inner coil pipe of the energy gathering cover along the outer coil pipe, and the liquid entering the inner coil pipe is heated for the second section. The energy-gathering cover covering the heating body is arranged in the box body, the outer coil pipe is arranged outside the energy-gathering cover, the inner coil pipe is arranged in the energy-gathering cover, cold water firstly enters the outer coil pipe and exchanges heat with hot water in the box body so that the cold water can be preheated, the preheated cold water enters the inner coil pipe in the energy-gathering cover and is heated by the heating body and the hot water in the energy-gathering cover for the second time, and the heat exchange efficiency is improved. And the energy-saving effect is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid heating, in particular to a heat exchange type electric water heater. Background Art

[0002] Existing heat exchange type electric water heaters usually only have one-stage heating and directly use a heating pipe for heating, which results in a relatively long time for the water heater to heat cold water. For example, Chinese Patent No. ZL202121430544.3 discloses a water heater, including an inner tank. A heat exchanger is arranged inside the inner tank. A first heating pipe installation hole, a water replenishing pipe, and a water tank pressure relief pipe are arranged on the upper side of the inner tank. A first heating pipe is installed inside the first heating pipe installation hole. A water replenishing valve is installed at the upper end of the water replenishing pipe, and the first heating pipe installation hole is located between the water replenishing pipe and the water tank pressure relief pipe. A second heating pipe installation hole, a water inlet, and a water outlet are arranged on the lower side of the inner tank. A second heating pipe is installed inside the second heating pipe installation hole, and the second heating pipe installation hole is located on one side of the water inlet and the water outlet. Content of the Utility Model

[0003] The purpose of the utility model is to provide a heat exchange type electric water heater. A heat collecting cover covering the heating element is arranged inside the box body. An outer coil pipe is arranged outside the heat collecting cover, and an inner coil pipe is arranged inside the heat collecting cover. Cold water first enters the outer coil pipe to exchange heat with the hot water inside the box body, so as to preheat the cold water (the first heating). The preheated cold water enters the inner coil pipe inside the heat collecting cover and is secondarily heated by the heating element and the hot water inside the heat collecting cover, achieving an energy-saving effect.

[0004] The purpose of the utility model is achieved as follows:

[0005] A heat exchange type electric water heater, including a box body for storing liquid and provided with a hot water outlet end and a cold water inlet end. A water tank pressure relief pipe is arranged on the box body. One end of the water tank pressure relief pipe extends along the top wall inside the box body. A pressure relief gap is formed between the pressure relief end of the water tank pressure relief pipe and the top wall inside the box body. When the liquid inside the box body reaches the pressure relief gap, the liquid enters the water tank pressure relief pipe along the pressure relief gap and is discharged outside the box body, playing a role in pressure relief. The purpose is to make the water tank have no pressure and extend the service life of the water tank by 2 times compared with that of a traditional water heater;

[0006] A heat collecting cover, an outer coil pipe, an inner coil pipe, and a heating element are arranged inside the box body. The outer coil pipe is located outside the heat collecting cover, the inner coil pipe and the heating element are located inside the heat collecting cover, and one end of the outer coil pipe is communicated with the inner coil pipe; the other end of the outer coil pipe is communicated with the cold water inlet end of the box body, and one end of the inner coil pipe is communicated with the hot water outlet end of the box body;

[0007] Liquid enters from the cold water inlet end of the box body and exchanges heat with the liquid inside the box body in the outer coil, and the liquid entering the outer coil is heated in the first stage; the liquid enters the inner coil of the energy concentrating cover along the outer coil, and the liquid entering the inner coil is heated in the second stage. The cold water first enters the outer coil and exchanges heat with the hot water in the box body to preheat the cold water (the first heating). The preheated cold water enters the inner coil in the energy concentrating cover and is secondarily heated by the heating element and the hot water in the energy concentrating cover, achieving an energy-saving effect.

[0008] A heat exchange type electric water heater. Liquid enters from the cold water inlet end of the box body and exchanges heat with the liquid inside the box body. The liquid enters the inner coil of the energy concentrating cover along the outer coil and is secondarily heated by the heating element and the hot water in the energy concentrating cover and then flows out; the preheated liquid in the box body uses pure water, and pure water is non-conductive. The heating element is suspended in the pure water in the box body and does not contact the coil and the water in the coil, achieving the effect of separating water and electricity.

[0009] A heat exchange type electric water heater. The liquid in the box body belongs to a heat medium and does not flow and does not contact the liquid flowing in the coil. The water in the water tank uses pure water, and pure water does not contain impurities H2O and is pure. Therefore, the water tank and the heating element do not scale after long-term heating and use, realizing lifelong cleaning-free.

[0010] One end of the water tank pressure relief pipe penetrates through the inner bottom wall of the box body and is fixedly connected to the inner bottom wall of the box body. The water tank pressure relief pipe is directly fixed on the bottom wall of the box body, and no additional support and connection parts are required, simplifying the internal structure of the box body.

[0011] A first fixing pipe for fixing a liquid sensor is provided in the box body. A high water level sensor for detecting the high water level in the box body is provided on the first fixing pipe. The position height of the pressure relief end of the water tank pressure relief pipe on the box body is greater than the position height of the high water level sensor on the box body.

[0012] A low water level sensor for detecting the low water level in the box body on the first fixing pipe.

[0013] A second fixing pipe for fixing a temperature sensor is provided in the box body.

[0014] The liquid level sensor and the temperature sensor

[0015] The outer coil is spirally wound between the inner side of the box body and the outer side of the energy concentrating cover; and a part of the outer coil is located above the energy concentrating cover. One end of the outer coil communicating with the inner coil is close to the inner bottom wall of the box body. When the liquid enters the outer coil and the inner coil along the box body and the cold water inlet end, the liquid flows from the low place to the high place of the outer coil and then from the high place to the low place.

[0016] The inner coil is spirally wound between the inner side of the energy concentrating cover and the outer side of the heating element; a part of the inner coil is close to the inner top wall of the energy concentrating cover. One end of the inner coil communicating with the hot water outlet end of the box body is close to the inner bottom wall of the energy concentrating cover, so that the liquid flows from the high place to the low place of the inner coil.

[0017] Both the top and bottom of the energy - concentrating cover are provided with openings, so that the energy - concentrating cover and the bottom form a vertically - through structure, facilitating the hot water in the box body to enter the energy - concentrating cover.

[0018] A water - replenishing device for supplementing the liquid in the box body is provided on the box body. When the low - water - level sensor is triggered when the liquid in the box body decreases, the water - replenishing device fills water into the box body.

[0019] The water - replenishing device includes a water - replenishing pipe communicating with the inner cavity of the box body and a switching valve connected to the water - replenishing pipe.

[0020] The switching valve is an electromagnetic valve.

[0021] The cold - water inlet end of the box body is connected to a flow - dividing valve, and the hot - water outlet end of the box body is connected to a mixing valve. The flow - dividing valve is provided with a first connection end, a second connection end, a third connection end and a fourth connection end;

[0022] The first connection end of the flow - dividing valve is connected to the cold - water inlet end through a pipeline;

[0023] The second connection end of the flow - dividing valve is connected to the switching valve through a pipeline;

[0024] The third connection end of the flow - dividing valve is connected to the cold - water inlet device through a pipeline;

[0025] The fourth connection end of the flow - dividing valve is connected to the mixing valve through a pipeline;

[0026] When the switching valve is in the open state, the liquid from the cold - water inlet device flows through the switching valve along the second connection end of the flow - dividing valve and flows to the water - replenishing pipe;

[0027] When the switching valve is in the closed state, the liquid from the cold - water inlet device enters the cold - water inlet end along the first connection end of the flow - dividing valve;

[0028] When the mixing valve is in the closed state, the hot - water outlet end of the box body flows out hot water alone;

[0029] When the mixing valve is in the open state, the liquid from the cold - water inlet device flows along the flow - dividing valve to the mixing valve and is mixed with the liquid at the hot - water outlet end of the box body to form a cold - hot water mixture.

[0030] The beneficial effects of the present utility model are as follows:

[0031] By providing an energy - concentrating cover covering the heating element in the box body, an outer coil is provided outside the energy - concentrating cover, and an inner coil is provided inside the energy - concentrating cover. Cold water first enters the outer coil to exchange heat with the hot water in the box body to pre - heat the cold water (the first heating). The pre - heated cold water enters the inner coil inside the energy - concentrating cover and is secondarily heated by the heating element and the hot water in the energy - concentrating cover, achieving an energy - saving effect. Description of the Drawings

[0032] Figure 1 Schematic diagram of the internal structure of an electric water heater according to an embodiment of the present utility model. Detailed implementation manners

[0033] The present utility model will be further described below in conjunction with the accompanying drawings and embodiments.

[0034] See Figure 1 , a heat exchange type electric water heater, including a box body 1 for storing liquid and provided with a hot water outlet end 8 and a cold water inlet end 9. A water tank pressure relief pipe 2 is provided on the box body 1. One end of the water tank pressure relief pipe 2 extends along the inner top wall of the box body 1, and a pressure relief gap 3 is formed between the pressure relief end of the water tank pressure relief pipe 2 and the inner top wall of the box body 1;

[0035] A heat collecting cover 4, an outer coil pipe 5, an inner coil pipe 6 and a heating element 7 are provided in the box body 1. The outer coil pipe 5 is located outside the heat collecting cover 4, and the inner coil pipe 6 and the heating element 7 are located inside the heat collecting cover 4. Alternatively, the inner coil pipe 6 is spirally wound outside the heat collecting cover 4, and one end of the outer coil pipe 5 is communicated with the inner coil pipe 6; the other end of the outer coil pipe 5 is communicated with the cold water inlet end 9 of the box body 1, and one end of the inner coil pipe 6 is communicated with the hot water outlet end 8 of the box body 1;

[0036] The liquid enters the outer coil pipe 5 from the cold water inlet end 9 of the box body 1 to exchange heat with the liquid in the box body 1, and the liquid entering the outer coil pipe 5 is heated for the first stage; the liquid enters the inner coil pipe 6 of the heat collecting cover 4 along the outer coil pipe 5, and the liquid entering the inner coil pipe 6 is heated for the second stage.

[0037] One end of the water tank pressure relief pipe 2 penetrates through the inner bottom wall of the box body 1 and is fixedly connected to the inner bottom wall of the box body 1.

[0038] In this embodiment, a plurality of support frames are provided in the outer coil pipe 5. The bottom of the support frame is fixedly connected to the bottom wall of the box body. The outer coil pipe 5 is spirally wound outside the support frame along the outer side of the support frame, and the outer coil pipe 5 is fixedly connected to the outer side of the support frame. A limit installation groove for limiting and installing the outer coil pipe 5 is provided on the outer side of the support frame.

[0039] A first fixing pipe 10 for fixing a liquid sensor is provided in the box body 1. A high water level sensor 11 for detecting the high water level in the box body 1 is provided on the first fixing pipe 10. The position height of the pressure relief end of the water tank pressure relief pipe 2 on the box body 1 is greater than the position height of the high water level sensor 11 on the box body 1.

[0040] A low water level sensor 12 for detecting the low water level in the box body 1 is provided on the first fixing pipe 10.

[0041] In this embodiment, the first fixing pipe 10 can penetrate through the bottom of the box body 1, or the first fixing pipe 10 is fixedly connected to the inner bottom wall of the box body 1 through a connecting flange.

[0042] A second fixing pipe 14 for fixing a temperature sensor 13 is provided in the box body 1.

[0043] In this embodiment, the second fixing pipe 14 can penetrate through the bottom of the box body 1, or the second fixing pipe 14 is fixed on the inner bottom wall of the box body 1 through a connecting flange.

[0044] In this embodiment, the first fixing pipe 10 and the second fixing pipe 14 are provided with perforations for installing sensors. The first fixing pipe 10 and the second fixing pipe 14 are of a hollow structure to facilitate the insertion of wires. After the wires are inserted, the tops of the first fixing pipe 10 and the second fixing pipe 14 must be sealed to prevent the liquid in the box body 1 from entering the first fixing pipe 10 and the second fixing pipe 14 and avoid safety accidents.

[0045] The outer coil pipe 5 is spirally wound between the inner side of the box body 1 and the outer side of the energy concentrating cover 4; and a part of the outer coil pipe 5 is located above the energy concentrating cover 4. One end of the outer coil pipe 5 communicating with the inner coil pipe 6 is close to the inner bottom wall of the box body 1. When the liquid enters the outer coil pipe 5 and the inner coil pipe 6 along the box body 1 and the cold water inlet end 9, the liquid flows from the lower part to the upper part of the outer coil pipe 5 and then flows from the upper part to the lower part.

[0046] Both the top and the bottom of the energy concentrating cover 4 are provided with openings 20 so that the energy concentrating cover 4 forms a vertically through structure with the bottom.

[0047] The inner coil pipe 6 is spirally wound between the inner side of the energy concentrating cover 4 and the outer side of the heating element 7; a part of the inner coil pipe 6 is close to the inner top wall of the energy concentrating cover 4, and one end of the inner coil pipe 6 communicating with the hot water outlet end 8 of the box body 1 is close to the inner bottom wall of the energy concentrating cover 4 so that the liquid flows from the upper part to the lower part of the inner coil pipe 6.

[0048] In this embodiment, the way of fixing the inner coil pipe 6 in the energy concentrating cover 4 can refer to the connection way between the outer coil pipe 5 and the support frame, which will not be elaborated here.

[0049] In this embodiment, the energy concentrating cover 4 can be supported and fixed on the inner bottom wall of the box body 1 through a support bench.

[0050] A water replenishing device 15 for replenishing the liquid in the box body 1 is provided on the box body 1.

[0051] The water replenishing device 15 includes a water replenishing pipe 16 communicating with the inner cavity of the box body 1 and a switching valve 17 connected to the water replenishing pipe 16.

[0052] The cold water inlet end 9 of the box body 1 is connected to a flow dividing valve 18, and the hot water outlet end of the box body 1 is connected to a mixing valve 19. The flow dividing valve 18 is provided with a first connection end, a second connection end, a third connection end and a fourth connection end;

[0053] The first connection end of the flow dividing valve 18 is connected to the cold water inlet end 9 through a pipeline;

[0054] The second connection end of the flow dividing valve 18 is connected to the switching valve 17 through a pipeline;

[0055] The third connection end of the flow dividing valve 18 is connected to the cold water inlet device through a pipeline;

[0056] The fourth connection end of the flow dividing valve 18 is connected to the mixing valve 19 through a pipeline;

[0057] When the switching valve 17 is in the open state, the liquid of the cold water inlet device flows along the second connection end of the flow dividing valve 18 through the switching valve 17 to the water replenishing pipe 16;

[0058] When the switching valve 17 is in the closed state, the liquid of the cold water inlet device enters the cold water inlet end 9 along the first connection end of the flow dividing valve 18;

[0059] When the mixing valve 19 is in the closed state, the hot water outlet end 8 of the box body 1 flows out hot water alone;

[0060] When the mixing valve 19 is in the open state, the liquid of the cold water inlet device flows along the flow dividing valve 18 to the mixing valve 19 and is mixed with the liquid at the hot water outlet end 8 of the box body 1 to form a cold and hot water mixture.

[0061] In this embodiment, the heating element 7 has an inverted U-shaped structure, and both ends of the heating element 7 extend out of the bottom of the box body 1.

[0062] The above is the preferred solution of the present invention, which shows and describes the basic principle, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A heat exchange electric water heater, comprising a box (1) for storing liquid and provided with a hot water outlet (8) and a cold water inlet (9), characterized in that: A water tank pressure relief pipe (2) is provided on the box body (1), one end of the water tank pressure relief pipe (2) is extended along the inner top wall of the box body (1), and a pressure relief gap (3) is formed between the pressure relief end of the water tank pressure relief pipe (2) and the inner top wall of the box body (1); An energy collecting cover (4), an outer coil (5), an inner coil (6) and a heating element (7) are provided in the box body (1); the outer coil (5) is located outside the energy collecting cover (4), and the inner coil (6) and the heating element (7) are located inside the energy collecting cover (4); or, the inner coil (6) is spirally wound on the outside of the energy collecting cover (4), and one end of the outer coil (5) is connected to the inner coil (6); the other end of the outer coil (5) is connected to a cold water inlet (9) of the box body (1), and one end of the inner coil (6) is connected to a hot water outlet (8) of the box body (1); Liquid enters the outer coil (5) from the cold water inlet end (9) of the housing (1) to exchange heat with the liquid in the housing (1), and the liquid entering the outer coil (5) is heated in the first stage; the liquid enters the inner coil (6) of the energy collecting cover (4) along the outer coil (5), and enters the inner coil (6) to be heated in the second stage.

2. The heat exchange electric water heater according to claim 1, characterized in that: One end of the water tank pressure relief pipe (2) passes through the inner bottom wall of the box body (1) and is fixedly connected to the inner bottom wall of the box body (1).

3. The heat exchange electric water heater according to claim 1, characterized in that: A first fixing tube (10) for fixing a liquid sensor is provided in the box body (1), a high water level sensor (11) for detecting a high water level of the box body (1) is provided on the first fixing tube (10), and a height of a pressure relief end of a water tank pressure relief tube (2) on the box body (1) is greater than a height of a high water level sensor (11) on the box body (1).

4. The heat exchange electric water heater according to claim 3, characterized in that: The first fixed pipe (10) is provided with a low water level sensor (12) for detecting a low water level in the box body (1).

5. The heat exchange electric water heater according to claim 1, characterized in that: A second fixing tube (14) for fixing the temperature sensor (13) is provided in the box body (1).

6. The heat exchange electric water heater according to claim 1, characterized in that: The outer coil (5) is spirally wound and arranged between the inner side of the casing (1) and the outer side of the energy collecting cover (4); and a portion of the outer coil (5) is located above the energy collecting cover (4); one end of the outer coil (5) is connected to the inner coil (6) and is close to the inner bottom wall of the casing (1); when liquid enters the outer coil (5) and the inner coil (6) along the casing (1) and the cold water inlet end (9), the liquid flows from the lower part of the outer coil (5) to the higher part, and then flows from the higher part to the lower part.

7. The heat exchange electric water heater according to claim 1, characterized in that: The inner coil (6) is spirally wound and arranged between the inner side of the energy collecting cover (4) and the outer side of the heating element (7); a portion of the inner coil (6) is arranged close to the inner top wall of the energy collecting cover (4), and a hot water outlet end (8) of the inner coil (6) connected to the box (1) is arranged close to the inner bottom wall of the energy collecting cover (4), so that liquid flows from a high position of the inner coil (6) to a low position; The top and bottom of the energy gathering cover (4) are both provided with openings (20), so that the energy gathering cover (4) and the bottom form a vertically penetrating structure.

8. The heat exchange electric water heater according to claim 1, characterized in that: The box body (1) is provided with a water replenishing device (15) for replenishing the liquid in the box body (1).

9. The heat exchange electric water heater according to claim 8, characterized in that: The water replenishment device (15) comprises a water replenishment pipe (16) connected to the inner cavity of the box body (1), and a switch valve (17) connected to the water replenishment pipe (16).

10. The heat exchange electric water heater according to claim 9, characterized in that: The cold water inlet end (9) of the box body (1) is connected to the diverter valve (18), and the hot water outlet end of the box body (1) is connected to the mixing valve (19), and the diverter valve (18) is provided with a first connection end, a second connection end, a third connection end and a fourth connection end; The first connection end of the diverter valve (18) is connected to the cold water inlet end (9) via a pipeline; The second connection end of the diverter valve (18) is connected to the switch valve (17) via a pipeline; The third connection end of the diverter valve (18) is connected to the cold water inlet device through a pipeline; The fourth connection end of the diverter valve (18) is connected to the water mixing valve (19) via a pipeline; The switch valve (17) is in an open state, and the liquid in the cold water inlet device flows along the second connection end of the diverter valve (18) through the switch valve (17) to the water supply pipe (16); The switch valve (17) is in a closed state, and the liquid in the cold water inlet device enters the cold water inlet end (9) along the first connection end of the diverter valve (18); The water mixing valve (19) is in a closed state, and the hot water outlet (8) of the box (1) only flows out hot water; The mixing valve (19) is in an open state, and liquid in the cold water inlet device flows along the diverter valve (18) to the mixing valve (19) and mixes with liquid at the hot water outlet (8) of the box (1), thereby forming a mixture of cold and hot water.

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