A circulating preheating coffee pot and its working method

Abstract

The present invention discloses a circulating preheating coffee pot, comprising a main body, a brewing chamber respectively installed on the main body, a water supply device, a heating device, a water inlet pipe, a water outlet pipe, a control device installed on the main body, a driving device, and a diversion structure, wherein the water supply device is connected to the heating device through the water inlet pipe, the water supply device is configured to supply water to the heating device through the water inlet pipe, the water outlet is respectively connected to the heating device and the diversion structure, the diversion structure comprises a first branch and a second branch provided with a water outlet switch, the water outlet pipe is connected to the water supply device through the first branch so that the water supply device, the water inlet pipe, the heating device, the water outlet pipe, and the first branch are connected in sequence and can form a circulating pipeline, a one-way valve device or a water pump is provided on the circulating pipeline, and the control device is electrically connected to the driving device. The coffee pot of the present invention can realize the preheating function. In addition, the present invention also provides a working method of the circulating preheating coffee pot.

Description

Technical Field

[0001] The present invention relates to the field of beverage preparation equipment, and more particularly to a circulating preheating coffee pot and a working method thereof. Background Art

[0002] A conventional coffee pot with a heating function can heat water for brewing coffee after the user adds water (usually tap water). Using such a coffee pot with a heating function, the user does not need to use other heating devices to heat the water before brewing coffee, which brings certain convenience to the user in brewing coffee. A coffee pot with a heating function is usually provided with a heating device, and a water supply unit supplies water to the heating device for heating, and the heating device delivers the heated water to the brewing unit of the coffee pot through a water outlet pipe. However, the coffee pot with a heating function has a defect that due to hydraulic reasons, part of the water will flow to the water outlet pipe after entering the heating device. During the heating process of the heating device, although the water being heated can be heated, the cold water entering the water outlet pipe is not heated. This results in that when the water in the heating device is heated to the set temperature and hot water is delivered to the brewing unit through the water outlet pipe, the first thing that enters the brewing unit is the cold water originally at the water outlet pipe, which will affect the effect of brewing coffee. In addition, when the hot water in the heating device enters the water outlet pipe, it will mix with some cold water in the water outlet pipe. At this time, the water temperature in the water outlet pipe is still lower than the water temperature of the hot water in the heating device. This part of low temperature water entering the brewing unit will also affect the effect of brewing coffee.

[0003] As described above, the conventional coffee maker with heating function cannot ensure that the water supplied to the brewing unit is at a constant temperature, or cannot ensure that the water supplied to the brewing unit is within a constant temperature range (such as between 80° C. and 100° C.), thereby destroying the effect of brewing coffee.

[0004] In addition, traditional coffee pots with heating functions cannot have both heating and cold brewing functions, which is inconvenient to use. It may take 12-48 hours to make cold brew coffee with good taste using traditional cold brew coffee tools, which is very time-consuming. Therefore, how to shorten the extraction time and make the substances in the coffee powder dissolve quickly and fully in water, so as to make cold brew coffee efficiently and quickly, is an urgent problem to be solved. Summary of the invention

[0005] In order to overcome the deficiencies of the prior art, an object of the present invention is to provide a circulating preheating coffee maker with a preheating function.

[0006] In order to overcome the defects existing in the prior art, the present invention provides a circulating preheating coffee pot, comprising a main body, a brewing chamber, a water supply device, a heating device, a water inlet pipe, and a water outlet pipe respectively installed on the main body, and also comprising a control device, a driving device, and a flow diversion structure installed on the main body, wherein the water supply device is connected with the heating device through the water inlet pipe, and the water supply device is configured to be able to supply water to the heating device through the water inlet pipe, one end of the water outlet pipe is connected with the heating device, and the other end of the water outlet pipe is connected with the flow diversion structure, and the flow diversion structure includes a first branch and a second branch, and the water outlet pipe is connected with the water supply device through the first branch so that the water supply device, the water inlet pipe, the heating device, the water outlet pipe, and the first branch are connected in sequence and can A circulation pipeline is formed, a one-way valve device is provided on the circulation pipeline to limit the direction of water flow, or a water pump is provided on the circulation pipeline to limit the direction of water flow, the heating device is used to preheat or heat the water flowing into the heating device, the second branch is provided with a water outlet switch, the water outlet switch is used to open or close the second branch, so that when the water outlet switch is turned on, the water outlet pipe is connected with the brewing chamber through the second branch, and when the water outlet switch is closed, the water outlet pipe is not connected with the brewing chamber, the control device is electrically connected to the drive device, and the control device is configured to control the drive device to drive the water outlet switch to open, so that water flows from the water outlet pipe through the second branch into the brewing chamber.

[0007] When using the circulating preheating coffee pot of the above scheme, the water supply device supplies water to the heating device through the water inlet pipe for preheating. The water in the heating device expands due to the heat, and its density becomes smaller and lighter, and the water level rises. Due to the restriction of the one-way valve device, the water cannot flow back from the heating device through the water inlet pipe to the water supply device. Therefore, after the water is preheated, it flows into the water outlet pipe, the first branch, and flows back to the water supply device. Then, the water flows from the water supply device through the water inlet pipe to the heating device for preheating, and then flows back to the water supply device. In this way, the water can circulate in the circulation pipeline and be preheated by the heating device. Since the water circulates, there is no situation that some cold water remains in the water outlet pipe and cannot be heated when the coffee machine is heated, as in the traditional coffee machine. When the water in the circulation pipeline is preheated, it can flow into the heating device again. The control device controls the driving device to drive the water outlet switch to open, and the water heated by the inflow device flows from the heating device to the water outlet pipe, passes through the second branch, and enters the brewing chamber for brewing coffee. This can ensure that no cold water flows from the water outlet pipe into the brewing chamber, thereby improving the brewing effect. In addition, the present invention does not need to set up an additional preheating device, and only needs to use the above-mentioned heating device to achieve the preheating and heating functions, with a simple structure and easy use. The above-mentioned one-way valve device can also be replaced by a water pump. When using a circulating preheating coffee pot, the water supply device supplies water to the heating device through the water inlet pipe for preheating. The water in the heating device expands in volume due to heat, and its density becomes smaller and lighter, and the water level will rise. In addition, the water pump can be used to limit the direction of water flow, so that water cannot flow back from the heating device through the water inlet pipe to the water supply device. Therefore, after preheating, the water flows into the water outlet pipe, the first branch, and flows back to the water supply device in sequence.

[0008] In one embodiment, the water supply device includes a water tank installed on the main body, the water tank is connected to the heating device through a water inlet pipe, the water tank is arranged so that the bottom of the water tank is higher than the bottom of the heating device, and the water outlet pipe is connected to the water tank through a first branch so that the water tank, the water inlet pipe, the heating device, the water outlet pipe, and the first branch can form a circulation pipeline together. Specifically, the water tank can be arranged above the heating device. Since the bottom of the water tank is higher than the bottom of the heating device, the water in the water tank can easily flow from the water tank through the water inlet pipe into the heating device for heating without the need for a water pump.

[0009] In one embodiment, the water supply device includes a water tank installed on the main body, and the circulating preheating coffee pot includes a water pump and a one-way valve device installed on the main body, that is, the circulating preheating coffee pot is provided with both a water pump and a one-way valve device, and the water pump is configured to pump water in the water tank to the heating device, so that the water flows back to the water tank or the brewing chamber through the heating device, the water outlet pipe, and the diversion structure.

[0010] Specifically, the water pump can be arranged between the water tank and the water inlet pipe, and is connected to the water tank and the water inlet pipe respectively, and is used to pump the water in the water tank to the heating device, and then pump it to the water outlet pipe, and then flow back to the water tank or enter the brewing chamber through the water outlet pipe. The water pump can also be arranged on the water tank and the water outlet pipe can also be arranged on the water tank. The pumping device can also be arranged between the water inlet pipe and the heating device, and is used to pump the water in the water tank to the heating device, and then pump it to the water outlet pipe, and then flow back to the water tank or enter the brewing chamber through the water outlet pipe. The water pump can also be arranged in the water tank, or at other positions on the main body of the circulating preheating coffee pot. Regarding the arrangement of the water pump, as long as it can meet the requirements of pumping the water in the water tank to the heating device, and then flowing back to the water tank or enter the brewing chamber through the water outlet pipe. If a water pump is arranged, since water can be pumped by the water pump, the bottom of the water tank does not need to be higher than the bottom of the heating device. Of course, when the bottom of the water tank is higher than the bottom of the heating device, the use of a water pump can further more effectively and quickly transport water.

[0011] In one embodiment, a reflux switch is provided on the first branch, and the reflux switch is used to open or close the first branch. When the water in the water tank needs to be circulated and preheated, the reflux switch is turned on so that the water in the water tank can flow back to the water tank through the water outlet pipe and the first branch in sequence after flowing into the heating device for preheating. In this way, the water can circulate in the circulation pipeline and be preheated. When the water in the water tank does not need to be circulated and preheated, the reflux switch can be turned off, so that the water in the heating device can be prevented from flowing back to the water tank. Specifically, the diversion structure has a water inlet, a first water outlet and a second water outlet, the water inlet and the first water outlet are connected to form a first branch, and the water inlet and the second water outlet are connected to form a second branch. The water outlet switch can be set at a position corresponding to the first water outlet to open or close the first water outlet, and the reflux switch can be set at a position corresponding to the first water outlet to open or close the second water outlet. The first end of the water outlet pipe is connected to the heating device, the second end of the water outlet pipe is connected to the water inlet, the first water outlet is connected to the water supply device, and the second water outlet is connected to the brewing chamber.

[0012] In one embodiment, the control device includes a first thermostat, the circulating preheating coffee pot includes a power board mounted on the main body, and the first thermostat and the driving device are electrically connected to the power board respectively. Specifically, the first thermostat can control the driving device to work according to the temperature of the water in the circulating pipeline. When the temperature of the water in the water tank reaches a predetermined temperature, the first thermostat sends a signal to the power board, so that the power board supplies power to the driving device, and the driving device drives the water outlet switch to open. Therefore, the preheated water in the water tank can enter the heating device again for heating, and can flow through the water outlet pipe and the second branch in sequence, so as to enter the brewing chamber for brewing coffee. The predetermined temperature mentioned above can be between 40-70°C, preferably, the predetermined temperature is between 50-60 degrees. Here, it should be noted that during the preheating process, since the water is circulating, the temperature of the water at different positions in the circulating pipeline may be different at the same time point. For example, at the same time point during the preheating process, because the heating device is in a heating state, the water will heat up after entering the heating device, and the temperature of the water in the heating device is higher than the temperature of the water in the water inlet pipe. Similarly, since the water flows into the water outlet pipe after being heated in the heating device, the temperature of the water in the water outlet pipe is higher than the temperature of the water in the water tank. Therefore, when the water in the water tank reaches a predetermined temperature, for example, when the water in the water tank is 60°C, the water in the water outlet pipe has reached a higher temperature, for example, 90 degrees. Alternatively, the heating device can continue to work from the preheating process to the heating process, and there can be no time interval between the preheating process and the heating process. For example, the water in the water tank is circulated and preheated and heated to above 90 degrees through the heating device and the water pump, the water outlet switch is turned on, and the water enters the brewing chamber to brew the coffee powder. The water pump and / or the heating device can continue to work or stop working.

[0013] In one embodiment, the brewing chamber is detachably connected to the water tank so that the brewing chamber can be removed for cleaning and coffee powder can be easily put into the brewing chamber. In order to filter the brewed coffee, a discharge port for discharging coffee is provided at the bottom of the brewing chamber, and the brewing chamber is provided with a first filter, which is configured so that the coffee can be filtered by the first filter before flowing out of the brewing chamber through the discharge port.

[0014] In one embodiment, the driving device includes a driving member, and a motor or a solenoid valve, wherein the motor or the solenoid valve is disposed on the main body, and the solenoid valve or the motor is connected to the driving member to drive the driving member to move.

[0015] In one embodiment, the discharge port is provided with a discharge switch, and the discharge switch is used to open or close the discharge port. Providing the discharge switch is helpful for the user to select different brewing modes. If the coffee powder only needs to contact with water for a short time, it is not necessary to close the discharge port, and the discharge switch may not be necessary. However, during the brewing process, if the coffee powder needs to contact with water for a long time in order to dissolve, it is necessary to close the discharge port with the discharge switch.

[0016] In one embodiment, the driving member is provided with a first driving part and a second driving part, wherein the first driving part is located at a position corresponding to the water outlet switch, and is used to drive the water outlet switch to open; the second driving part is located at a position corresponding to the discharge switch, and is used to drive the discharge switch to open.

[0017] In one embodiment, the diversion structure is provided at the bottom of the water tank, the first branch of the diversion structure includes a first channel arranged to pass through the bottom of the water tank, and the second branch of the diversion structure is a second channel arranged at the bottom of the water tank and extending laterally.

[0018] In one embodiment, the diversion structure also includes a hollow water outlet located in the water tank, the hollow water outlet having a hollow water outlet outlet and a hollow water outlet inlet, the hollow water outlet inlet is socketed with the first channel, and the reflux switch is provided at the hollow water outlet, the reflux switch is a movable valve, and the movable valve is used to open or close the hollow water outlet.

[0019] In one embodiment, in order to further filter the coffee, the first filter is arranged in the brewing chamber before the discharge port, and the brewing chamber is further provided with a second filter, and the second filter is located at the discharge port.

[0020] In one embodiment, for the convenience of users, a container for holding coffee liquid is further included, the container is located below the discharge port, the container has a container opening, and a third filter is disposed at the container opening.

[0021] In one embodiment, in order to allow the circulating preheating coffee pot to be used for cold brew coffee at the same time. The circulating preheating coffee pot also includes an air supply device, which is arranged on the main body. The air supply device is connected to the brewing chamber through an air guide component, and is used to supply air to the brewing chamber, so that when the brewing chamber contains water and coffee powder, the air supply device can supply air to the liquid formed by the mixture of water and coffee powder. When the coffee powder is put into the brewing chamber and the water supply device supplies water to the brewing chamber, the liquid formed by the mixture of water and coffee powder is supplied with air through the air supply device, so that the gas will flow in the liquid. Therefore, the gas drives the liquid to flow and roll, so that the coffee powder and water are fully stirred, and the dissolution of the substances in the coffee powder in the water is accelerated, thereby achieving the effect of fast and full extraction.

[0022] In one embodiment, the air guide component includes a first air guide tube and a second air guide tube, a brewing chamber opening is provided at the top of the brewing chamber, a first end of the first air guide tube is communicated with an air supply device, a second end of the first air guide tube is detachably connected to a first end of the second air guide tube, and a second end of the second air guide tube is inserted into the brewing chamber through the brewing chamber opening. Since the second air guide tube is inserted into the brewing chamber and contacts the liquid in the brewing chamber, the user sometimes needs to clean the second air guide tube, and by separating the second air guide tube from the first air guide tube, the second air guide tube can be taken out for cleaning, which is more convenient to use.

[0023] In one embodiment, the brewing cavity opening is provided with a brewing cavity cover that can cover the brewing cavity opening, and the brewing cavity cover is provided with a plurality of air holes. When the air supply device supplies air to the brewing cavity, the brewing cavity cover can prevent coffee powder from escaping from the brewing cavity opening and contaminating the coffee pot. The air holes on the brewing cavity cover are conducive to the discharge of gas in the brewing cavity.

[0024] In one embodiment, the brewing chamber cover is provided with the second air duct, the second air duct includes a cavity and a tube portion connected to the cavity, the cavity is provided in the brewing chamber cover, the cavity is connected to the second end of the first air duct, and the brewing chamber cover is provided with the tube portion extending downward from the brewing chamber cover, so that when the brewing chamber cover is closed with the brewing chamber opening, the tube portion extends into the brewing chamber.

[0025] In one embodiment, the second air duct passes through the brewing chamber opening, and the second end of the second air duct is arranged in the brewing chamber at a position lower than the middle of the brewing chamber. The position of the second end of the second air duct lower than the middle of the brewing chamber facilitates the second end of the second air duct to contact with the liquid in the brewing chamber.

[0026] Another object of the present invention is to provide a working method of a coffee machine.

[0027] The working method of the coffee machine comprises the following steps: a. adding coffee powder to the brewing chamber; b. adding water to the water supply device; c. starting the heating device, so that water circulates in the circulation pipeline and is preheated by the heating device; d. when the water in the water supply device is preheated to the set temperature, the control device controls the driving device to start, the driving device drives the water outlet switch to turn on, and water flows from the water outlet pipe through the second branch into the brewing chamber.

[0028] Furthermore, the step d also includes that the driving device drives the water outlet switch to open while the driving device also opens the discharge switch.

[0029] The beneficial effect of the present invention is that by circulating and preheating water, it can be ensured that no cold water flows into the brewing chamber from the water outlet pipe, thereby improving the brewing effect. In addition, the present invention does not need to set up an additional preheating device, and the heating device of the present invention can realize the preheating and heating functions respectively, with a simple structure and convenient use. In addition, the present invention also has a cold brewing function, which can efficiently and quickly make cold brew coffee. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the explosion structure of the circulating preheating coffee maker according to Example 1 of the present invention.

[0031] Figure 2 This is a schematic diagram of the partial explosion structure of the circulating preheating coffee maker according to Example 1 of the present invention, mainly showing the structure of the water tank.

[0032] Figure 3 This is a schematic diagram of the partial explosion structure of the circulating preheating coffee maker according to Example 1 of the present invention, mainly showing the structure of the components below the water tank.

[0033] Figure 4 This is a schematic diagram of the explosion structure of the brewing chamber of the cyclic preheating coffee maker according to embodiment 1 of the present invention.

[0034] Figure 5 This is a schematic diagram of the explosion structure of the preheating water outlet of the circulating preheating coffee maker according to Example 1 of the present invention.

[0035] Figure 6 This is a working state diagram of the cyclic preheating coffee maker according to Example 1 of the present invention.

[0036] Figure 7 This is a working state diagram of the circulating preheating coffee maker according to Example 1 of the present invention when the second water outlet and the discharge port are opened.

[0037] Figure 8 This is a working state diagram of the cyclic preheating coffee maker according to Example 1 of the present invention.

[0038] Fig. 9 for Figure 6 Enlarged view of part A.

[0039] Fig.10 This is a schematic cross-sectional view of a circulating preheating coffee maker according to a second embodiment of the present invention.

[0040] Fig.11 This is a schematic diagram of the explosion structure of the circulating preheating coffee maker according to Example 3 of the present invention.

[0041] Fig.12 It is a schematic diagram of the partial explosion structure of the circulating preheating coffee maker according to Example 3 of the present invention.

[0042] Fig.13 This is a schematic diagram of the exploded structure of the brewing chamber cover of the cyclic preheating coffee maker according to Example 3 of the present invention.

[0043] Fig.14 This is a schematic cross-sectional view of the circulating preheating coffee maker according to Example 3 of the present invention.

[0044] Fig.15 This is a schematic diagram of the installation state of the brewing chamber of the circulating preheating coffee maker according to Example 3 of the present invention.

[0045] Fig.16 It is a partial schematic diagram of a circulating preheating coffee maker according to Embodiment 4 of the present invention. DETAILED DESCRIPTION

[0046] The present invention is further described below in conjunction with the above-mentioned drawings. The drawings are only used for exemplary description and cannot be understood as limiting the present patent; in order to better illustrate the present embodiment, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0047] Example 1

[0048] like Figure 1 and 9As shown, a circulating preheating coffee pot comprises a main body, a brewing chamber 6 respectively mounted on the main body, a water supply device, a heating device 18, a water inlet pipe 15, and a water outlet pipe 10, and also comprises a control device, a driving device, and a flow diversion structure mounted on the main body. In this embodiment, the main body comprises a base 20, the water supply device comprises a water tank 3 fixed above the base 20, the water tank 3 is connected to the heating device 18 through the water inlet pipe 15, the water tank 3 is configured to be able to supply water to the heating device 18 through the water inlet pipe 15, the first end 1004 of the water outlet pipe 10 is connected to the heating device 18, the second end 1001 of the water outlet pipe 10 is connected to the flow diversion structure, the flow diversion structure comprises a first branch 110 and a second branch 120, the water outlet pipe 10 is connected to the water tank 3 through the first branch 110 so that the water tank 3, the water inlet pipe 15, the heating device 18, the water outlet pipe 10, and the first branch 110 are connected in sequence and can form a circulating pipeline, and the circulating pipeline is provided with There is a one-way valve device 231 to limit the direction of water flow. The heating device 18 is used to preheat or heat the water flowing into the heating device 18. The second branch 120 is provided with a water outlet switch 402. The water outlet switch 402 is used to open or close the second branch 120, so that when the water outlet switch 402 is turned on, the water outlet pipe 10 is connected with the brewing chamber 6 through the second branch 120, and when the water outlet switch 402 is closed, the water outlet pipe 10 is not connected with the brewing chamber 6. The control device is electrically connected to the driving device, and the control device is configured to control the driving device to drive the water outlet switch 2 to open, so that water flows from the water outlet pipe 10 through the second branch 120 into the brewing chamber 6. The diversion structure comprises a water inlet 406 , a first water outlet 205 and a second water outlet 404 . The water inlet 406 and the first water outlet 205 are connected to form a first branch 110 , and the water inlet 406 and the second water outlet 404 are connected to form a second branch 120 .

[0049] Specifically, the water tank 3 has a water tank opening and a water tank cover 1, the water tank cover 1 covers the water tank opening, and a handle 101 is provided on the water tank cover 1. The bottom of the water tank 3 is provided with a second channel 1102 extending transversely, and is also provided with a first channel 1101 communicating with the second channel 1102 and penetrating the bottom of the water tank 3, so that the first channel 1101 is connected with the water tank 3. Specifically, in this embodiment, a first groove opening downward is formed on the outer surface of the bottom of the water tank 3, and a water outlet nozzle 4 is correspondingly provided at the bottom of the water tank 3, and the water outlet nozzle 4 forms a second groove 405 opening upward corresponding to the first groove, and the water outlet nozzle 4 is located at a position corresponding to the first groove and combined with the bottom of the water tank 3, thereby forming a diversion structure, wherein the first groove and the second groove 405 are combined to form the second channel 1102. In this embodiment, the diversion structure further includes a hollow water outlet 2 located in the water tank, and the hollow water outlet has a hollow water outlet outlet 205 and a hollow water outlet inlet 206. In the embodiment, the hollow water outlet outlet 205 serves as the first water outlet 205 of the diversion structure. The hollow water outlet inlet 206 is sleeved with the first channel 1101, and the hollow water outlet outlet 206 is provided with the reflux switch 202, which is a movable valve 202, and the movable valve 202 is used to open or close the hollow water outlet outlet 205. A floating member 203 is also provided at the lower side of the movable valve 202, and the movable valve 202 is fixedly connected to the floating member 203. The float 203 is provided with a float cavity 2031, or the float 203 can be made of a material with a density less than that of water, so that when the water level of the water tank rises, it can move upward with the help of the buoyancy of water, pushing the movable valve 202 upward to open the hollow water outlet 206. The water outlet nozzle 4 is provided with the second water outlet 404, and a water outlet switch 402 is provided at the second water outlet 404. Specifically, the water outlet switch 402 is a water outlet valve 402, and a water outlet valve spring 403 is provided between the water outlet valve 402 and the bottom of the water tank 3. One end of the water outlet valve 403 is located at the second water outlet 404, and the other end is connected to the driving device. A sealing member 401 is also provided between the water outlet valve 402 and the second water outlet 404. The water tank 3 is also provided with an overflow port 303 for discharging steam and excess cold water to be heated.

[0050] In order to locate the water outlet pipe 10 and the water inlet pipe 15, and also to prevent the user from directly contacting the water outlet pipe 10 and the water inlet pipe 15 and possibly causing burns, the water outlet pipe 10 is provided with a first positioning column sleeve 9 on the outside, and the water inlet pipe 15 is provided with a third positioning column sleeve 14 on the outside. In order to observe the water level or water flow in the water outlet pipe 10 and the water inlet pipe 15, the water outlet pipe 10 and the water inlet pipe 15 are made of transparent materials, and the first positioning column sleeve 9 and the third positioning column sleeve 14 are provided with a first tube hole 901 and a third tube hole 1401, respectively, so that the water in the water outlet pipe 10 and the water inlet pipe 15 can be observed through the first tube hole 901 and the third tube hole 1401. Corresponding to the first tube hole 901, the front part of the water outlet pipe 10 is provided with a first viewing position 1003. Corresponding to the third tube hole 1401, the front part of the water inlet pipe 15 is provided with a third viewing position 1403. At the same time, the rear parts of the outlet pipe 10 and the inlet pipe 15 are respectively provided with refractive surfaces 1002, 1502. The inlet pipe 10 has an inlet pipe first end 1504 and an inlet pipe second end 1503, and the outlet pipe 10 has an outlet pipe first end 1004 and an outlet pipe second end 1001. The outlet pipe first end 1004 and the inlet pipe second end 1503 are also respectively provided with threads and nuts 1006, 1501 corresponding to the threads.

[0051] The driving device includes a driving member 11 and a solenoid valve 17, wherein the solenoid valve 17 is arranged on a base 20, and the solenoid valve 17 is connected to the driving member 11, and is used to drive the driving member 11 to move. Specifically, the driving member 11 is a driving rod 11, and the upper end of the driving rod 11 extends laterally to form a first driving portion 111, and the rod body of the driving rod 11 is provided with a first driving portion 112 protruding laterally. Specifically, the base 20 includes a base shell 200 and a bottom cover 21, and the solenoid valve 17 is elastically arranged on the bottom cover 21 through a third spring 171, and the bottom cover 21 is also provided with a bracket 19. A driving seesaw 16 is arranged below the driving rod 11, and one end of the driving seesaw 16 is rotatably connected to the hinge 1902 of the support frame 19, and the other end is placed on the solenoid valve 17, so when the solenoid valve 17 is powered on, the solenoid valve 17 moves upward, pushing the seesaw 16 to move upward around the hinge 1902, thereby raising the driving rod 11, and the driving rod 11 thus moves upward. A driving recess is set in the middle of the driving rocker 16, and the driving recess is movably connected to the bottom of the driving rod 11. The driving recess can limit the driving rod to keep the driving rod 11 from getting stuck during longitudinal movement; the third spring 171 is set at the bottom of the driving shaft of the solenoid valve 17, and the elastic force of the third spring 171 at least offsets part of the gravity of the driving rod 11, helping the driving shaft of the solenoid valve 17 to overcome resistance and lift the driving rod 11 when rising, and the water outlet valve spring 403 or the second spring 609 is driven and compressed at the same time.

[0052] In this embodiment, a support column 12 is further provided between the water tank 3 and the base 2. The support column 12 is provided with a groove that matches the driving rod 11. The driving rod 11 is embedded in the support column 12 through the groove and moves on the support column 12. In order to position the support column and for aesthetics, a second positioning column sleeve 13 is also sleeved on the outside of the support column 12. The second positioning column sleeve 13 is also provided with a slide groove 130 so that the first driving part 111 and the first driving part 112 can move outside the second positioning column sleeve 13 through the slide groove 130.

[0053] The support frame 19 is provided with a water outlet pipe joint 1901 and a water inlet pipe joint 1903 at the lower part, and a heating device 18 is provided on the support frame 19. The first end 1004 of the water outlet pipe is connected to the water outlet pipe joint 1901 and communicated with the heating device 18, and the water inlet pipe 15 is connected to the water inlet pipe connection part 1903 and communicated with the heating device 18. A power board 1904 is also provided on the support frame 19. The base shell 200 is also provided with a water inlet pipe mounting hole 2002, a water outlet pipe mounting hole 2003 and a button 2001. During installation, the water inlet pipe 10 passes through the water inlet pipe mounting hole 2002 and is connected to the water outlet pipe joint 1901, and the water inlet pipe 15 passes through the water outlet pipe mounting hole 2003 and is connected to the water inlet pipe joint 1903. The support frame is also provided with a heating device inlet and a heating device outlet, the heating device inlet is connected to the water outlet pipe joint 1901, and the heating device outlet is connected to the inlet pipe joint 1903. The control device includes a first thermostat 230 arranged on the pipe inlet joint 1903. The first thermostat 230 is arranged at the front end of the one-way valve device 231 to measure the temperature of water before entering the heating device 18, that is, the temperature close to the water tank. The one-way valve device 231 is arranged at the entrance of the heating device 18. The one-way valve device 231 blocks the expansion of hot water when the heating device 18 is heated and flows back to the high-temperature water, thereby avoiding the misjudgment of the first thermostat 230. The heating device 18 is also provided with a second thermostat 232. The second thermostat 232 is used to control the working state of the heater to prevent the heating device from being too high and causing dry burning. When the heating device reaches the set temperature, the second thermostat 232 controls the heating device to stop working. A water level lamp 233 is arranged on the bottom cover 21, and the water level lamp 233 is covered with a lampshade 23. The water level lamp 233 and the lampshade 23 are located below the water inlet pipe 15 and the water outlet pipe 10. When the light is on, the water flow of the water inlet pipe 15 and the water outlet pipe 10 and the bubbles that appear can be clearly seen, which increases the ornamental value. Therefore, in this embodiment, the water tank 3 is fixedly connected to the base 20 by the water inlet pipe 10, the support column 12 and the water inlet pipe 15. The lower ends of the water inlet pipe 15 and the water outlet pipe 10 are respectively provided with threads, and the threads are adapted to and fixedly connected to the base 20 with nuts, and the lower ends of the threads are provided with silicone hose joints for tight connection, and the lower ends of the silicone hose joints are provided with lampshades 23 and water level lamps 233, and the light of the water level lamps points to the hollow positions of the water inlet pipe 15 and the water outlet pipe 10, and the rear walls of the water inlet pipe 15 and the water outlet pipe 10 are provided with transverse diamond-shaped patterns or diamond-shaped surfaces to refract the light; the light of the water level lamp points to the bubbles descending in the water inlet pipe 15 and the bubbles rising in the water outlet pipe 10, and the refracted light of the bubbles is observed and appreciated through the first tube hole 901 and the third tube hole 1401, and the main bodies of the water inlet pipe 15 and the water outlet pipe 10 are longitudinally arranged between the water tank 3 and the base 20. In other embodiments, the water inlet pipe 15 and the water outlet pipe 10 body may be longitudinally arranged on one side of the water tank 3 or the brewing chamber 6 .

[0054] The bottom of the water tank 3 is provided with a slide member 301 and a slide 302. A brewing chamber 6 is provided below the water tank 3. The upper part of the brewing chamber 6 is slidably connected to the bottom of the water tank 3 through the slide member 301. The bottom of the brewing chamber 6 is provided with a discharge port 611 for discharging coffee, and the brewing chamber 6 is provided with a first filter 5, which is configured so that the coffee can be filtered by the first filter 5 before flowing out of the brewing chamber through the discharge port 611. The opening edge of the brewing chamber 6 is provided with a hanging ear 608 corresponding to the slide 302, and the hanging ear 608 can move along the length direction of the slide 302 and be inserted into the slide 302. Therefore, the brewing chamber 6 can be plugged into the water tank 3 through the cooperation of the hanging ear 608 and the slide 302, so as to be suspended below the water tank 3. In order to facilitate the taking of the brewing chamber 6, a brewing chamber handle 605 is provided at the opening edge of the brewing chamber 6. In order to further fix the brewing chamber 6 at the bottom of the water tank 3, a snap button 602 is provided in the brewing chamber handle 605, and a slot matching the snap button 602 is provided at the bottom of the water tank. The snap button 602 is elastically arranged in the handle 605 by a first spring 603, and a hook portion that can be inserted into the slot is provided at one end of the snap button 602. The brewing chamber handle 605 is covered with a handle cover 601. The snap button 602 is provided with a pressing portion that protrudes upward and penetrates the handle cover 601. In the process of sliding the brewing chamber 6 along the length direction of the slide groove 302 and plugging it into the water tank, when the snap button 602 moves to the slot, the hook portion of the snap button 602 slides into the slot based on the slot and is locked, so that the brewing chamber 6 can be firmly installed under the water tank. When it is necessary to take out the brewing chamber 6 from under the water tank, just press the pressing part of the button 602, and the hook part of the button 602 will be separated from the slot, so that the brewing chamber 6 slides along the length direction of the slide groove 302 and is taken out. The front end of the slide groove 302 is low and inclined, the middle part is gentle, and the tail part protrudes a platform. When installing the brewing chamber, the ear 608 of the brewing chamber 6 enters from the front end of the slide groove 302 and moves to the tail of the slide groove 302. The platform forces the ear 608 of the brewing chamber 6 to rise, and the gap between the opening of the brewing chamber 6 and the bottom of the water tank 3 is reduced, so that the handle 605 is locked with the bottom of the water tank 3.

[0055] The discharge port 611 is provided with a discharge switch 607, and the discharge switch 607 is used to open or close the discharge port 611. Specifically, the discharge switch 607 is formed as a rotating seesaw 607, which has a bottom extending substantially horizontally and an upper portion extending upward along the bottom, the bottom of the rotating seesaw 607 is located below the discharge port, the rotating seesaw 607 is located outside the brewing chamber and is rotatably connected to the bottom of the brewing chamber 6, and the upper portion of the rotating seesaw 607 is elastically connected to the bottom of the brewing chamber 6 through a second spring 609. The upper portion of the rotating seesaw 607 is also provided with a driving recess corresponding to the second driving portion 112. Due to the elastic force of the second spring, the upper portion of the rotating seesaw 607 is away from the brewing chamber, and the bottom of the rotating seesaw 607 is therefore tightly against the discharge port 611, and the discharge port is therefore closed. When the driving rod 11 is driven, the driving rod 11 moves upward, the second driving part 112 abuts against the driving recess on the upper part of the rotating seesaw 607, and pushes the upper part of the rotating seesaw 607 close to the brewing chamber, and the bottom of the rotating seesaw 607 moves downward from the discharge port 611, so that the discharge port 611 is opened. To further seal the discharge port 611, a discharge port seal 606 is further provided between the rotating seesaw 607 and the discharge port 611. In this embodiment, the discharge port seal 606 is fixed on the bottom of the rotating seesaw 607.

[0056] A container 8 for holding coffee liquid is also provided below the brewing chamber 6. The container 8 is located below the discharge port 611. The container 8 has a container opening, and a third filter 7 is provided at the container opening. In this embodiment, the container 8 is a cup with a handle, which is convenient for users to take. The container 8 can be placed on the base 20 and can be removed from the base 20 according to user needs. In this embodiment, the cyclic preheating coffee pot also includes a cup probe 22 installed on the bracket 12.

[0057] The working method of the circulating preheating coffee pot of this embodiment includes the following steps: a. adding coffee powder to the brewing chamber 6; b. adding water to the water supply device; c. starting the heating device 18, the water circulates in the circulation pipeline and is preheated by the heating device; d. when the water in the water supply device 18 is preheated to the set temperature, the control device controls the driving device to start, the driving device drives the water outlet switch 402 to open, and the water flows from the water outlet pipe 10 through the second branch 120 into the brewing chamber 6.

[0058] Specifically, the working principle of the circulating preheating coffee pot of this embodiment is as follows: put coffee powder into the brewing chamber 6, plug the brewing chamber 6 with the bottom of the water tank 3 to fix the brewing chamber 6. Open the water tank cover 1 and add water to the water tank 3. Cold water (usually water at room temperature) flows from the water tank 3 (usually water at room temperature) into the water inlet pipe 15 and the heating device in sequence. During the water adding process, the water level of the water tank rises, the floating part rises to push the movable valve 202 to move upward, and the hollow water outlet 205 is opened. The heating device is started to heat up. The water in the heating device expands due to the heat, and its density becomes smaller and lighter. The water level will rise, and due to the restriction of the one-way valve device 213, the water in the heating device 18 cannot flow back to the water inlet pipe 15. Therefore, the water in the heating device 18 flows to the water outlet pipe 10 and enters the diversion structure. At this time, the second water outlet 404 is closed, so the water can only flow along the second channel 1102 to the hollow water outlet 2, and flow out from the hollow water outlet outlet 206 and enter the water tank 3. The water returned to the water tank flows into the water inlet pipe 15 again, so the water is circulated and preheated in the circulation pipeline according to the above sequence. The first thermostat 230 controls the preheating temperature of the water tank 3. When the water tank 3 reaches the predetermined temperature, the first thermostat 230 works and sends a signal to the power board 1904, and the power board 1904 supplies the solenoid valve 17 to work. The electromagnetic valve 17 drives the driven position 113 of the driving rod 11, and the driving rod 11 moves upward as a whole. The first driving part 111 and the second driving part 112 on the driving rod 11 simultaneously drive the water outlet valve 402 and the rotating seesaw 607 to open the second water outlet 404 and the discharge port 611 respectively to discharge water. At this time, the water in the water outlet pipe 10 is hot water, and its temperature is greater than the temperature of the water in the water tank. The hot water in the water outlet pipe flows through the second channel 1102 of the diversion structure and flows into the brewing chamber 6 from the water outlet 404 to brew coffee. At this time, the water level of the water tank is reduced, and the movable valve 202 closes the hollow water outlet 205 due to its own gravity. Therefore, the hot water in the water outlet pipe 10 cannot flow back into the water tank 3 and can only flow out from the second water outlet 404. Since the discharge port 611 is also opened, the hot water enters the brewing chamber 6 for brewing and can immediately flow out from the discharge port 611 to the cup 8 after being filtered by the first filter. It is filtered by the third filter before flowing into the cup 8. When the heating device reaches the set temperature, the second thermostat controls the heating device to stop working, so that the heating device stops heating.

[0059] Example 2

[0060] This embodiment is substantially the same as the first embodiment, and the only difference is that the specific structures of the driving device and the discharge switch 607 are different. In addition, a water pump 234 is added on the basis of the first embodiment. Specifically, in this embodiment, the driving device is substantially the same as the first embodiment, wherein although the driving element is still the driving rod 11, in this embodiment, the driving rod 11 is only provided with a first driving part 111 at the upper end thereof, which is used to drive the water outlet switch 404. In this embodiment, the discharge switch 607 is a movable valve body arranged at the discharge port. A driving protrusion 701 is provided on the third filter element 7 on the cup 8 at a position corresponding to the valve body, which is used to drive the valve body to move upward and open the discharge port. Therefore, when the cup 8 is placed on the base 20, the valve body is lifted up by the driving protrusion 701, thereby opening the discharge port. In addition, a water pump 234 is added to the water inlet pipe joint 1903, which is used to pump water to the heating device, so that the water flows back to the water tank 3 or the brewing chamber 6 through the heating device 18, the water outlet pipe 10, and the diversion structure.

[0061] Example 3

[0062] This embodiment is substantially the same as the embodiment 1, and the only difference is that an air supply device 014 and an air guide component are added, and the brewing chamber and brewing chamber related components are slightly different. The air supply device 014 is an air pump 014. The first filter 5 divides the brewing chamber 6 into a dissolving chamber 6001 located at the upper part of the brewing chamber 6 and a filtering chamber 6002 located at the lower part of the brewing chamber 6. A second filter 009 is provided between the first filter 5 and the discharge port 608 at the bottom of the brewing chamber 6. In this embodiment, the first filter 5 and the second filter 009 are respectively the first filter net 5 and the second filter net 009. For the convenience of cleaning, the first filter 5 and the second filter 009 are respectively detachably installed in the brewing chamber 6. The air guide component includes a first air guide tube 0121 and a second air guide tube 0131. A brewing chamber opening is provided at the top of the brewing chamber 6. The first end 0122 of the first air guide tube is connected to the air supply device 014. The second end 0123 of the first air guide tube is detachably connected to the first end 0132 of the second air guide tube. The second end 0133 of the second air guide tube is inserted into the brewing chamber 6 through the brewing chamber opening. The brewing chamber opening is provided with a brewing chamber cover 002 that can cover the brewing chamber opening. The brewing chamber cover 002 is provided with a plurality of air holes (not shown in the figure). Specifically, the brewing chamber cover 002 is a circular mesh cover, which includes a cover frame 0020 and a screen (not shown in the figure). In order to facilitate the placement of coffee powder into the brewing chamber 6, a semicircular small mesh cover 001 is also provided on the brewing chamber cover 002. The cover frame 0020 includes a first semicircular portion 0021 and a second semicircular portion 0022, wherein the first semicircular portion is provided with a screen, the second semicircular portion 0022 is hollowed out to form a brewing chamber cover opening 0023, and the second semicircular portion 0022 is covered with a semicircular small mesh cover 001, which is a flip cover rotatably connected to the cover frame. Therefore, when it is necessary to put coffee powder into the brewing chamber, it is not necessary to remove the brewing chamber cover 002, and the coffee powder can be put into the brewing chamber cover opening 0023 on the second semicircular portion 0022 by flipping the small mesh cover 001 upwards. The brewing chamber cover opening 0023 can be opened or closed by rotating the small mesh cover 001. In this embodiment, the mesh holes on the screen of the brewing chamber cover 002 and the mesh holes on the small mesh cover 001 serve as air holes on the brewing chamber cover 002.

[0063] The brewing chamber cover 002 is provided with the second air guide tube 0131, which includes a cavity and a tube portion 0024 communicating with the cavity. The brewing chamber cover 0021 is provided with the cavity, and the side of the brewing chamber cover 002 forms an air inlet joint 007 communicating with the cavity, and the air inlet joint 007 can be engaged with the second end 0123 of the first air guide tube. The middle of the brewing chamber cover 002 is provided with a tube portion 0024 extending downward, so that when the brewing chamber cover 002 covers the brewing chamber opening, the tube portion 0024 extends into the brewing chamber 6. The second air guide tube 0131 passes through the brewing chamber opening, and the second end 0133 of the second air guide tube is arranged in the brewing chamber 6 at a position lower than the middle of the brewing chamber 6.

[0064] The second air guide pipe 0131 passes through the brewing chamber cover 002, passes through the dissolving chamber 6001 and is connected to the first filter element 5, and is communicated with the filter chamber 6002 through the first filter element 5. The brewing chamber cover 002 is provided with a cold water driving part 005, a second air guide pipe cover 006, and a joint air inlet head 007. The air inlet head 007 is connected to the air outlet head 015. At least one of the air inlet head 007 and the air outlet head 015 is made of a flexible material.

[0065] A coffee cup 8 for holding coffee is also provided below the filter chamber 6002. A third filter 7 for filtering coffee is provided on the coffee cup 8. The third filter 7 is detachably connected to the coffee cup 8. The third filter 7 is a third filter net 7 in this embodiment. The small mesh cover 001 is turned upward to open the opening of the brewing chamber cover 002, and coffee powder can be put into the brewing chamber. The brewing chamber 6 is slidably connected to the bottom of the water tank 3. When the brewing chamber 6 is connected to the bottom of the water tank 3, the cold water drive unit 005 on the brewing chamber cover 002 starts the water outlet switch 402 to turn on, so that the water tank 3 supplies water to the brewing chamber 6, and the water enters between the brewing chamber cover 002 and the first filter 5. The air pump 014 is started to work, and the gas flows along the air pipe 0121, passes through the first air guide pipe 0121 and the second air guide pipe 0131 from the air pump 014 in sequence into the dissolution chamber 6001. When the gas is at the lower part of the first filter 5, it passes through the mesh on the first filter 5 and enters the dissolution chamber 6001. The gas flows from bottom to top to stir the coffee powder to roll and dissolve in the liquid. The gas supply time is set to 5 minutes in this embodiment. After the gas supply is completed, the solenoid valve 17 drives the driving rod 11 to move upward, and the driving unit 112 drives the discharge switch 607 to open and discharge the coffee. The first filter 5 performs the first filtration, and then the second filter 009 filters it. The coffee that has been filtered twice is discharged from the discharge port, flows through the third filter 7, and is filtered for the third time, and finally the cold-brewed coffee is obtained.

[0066] It should be noted that in this embodiment, when the circulating preheating coffee pot of this embodiment is used for cold brew coffee, the heating device does not work, that is, it does not have the preheating or heating function, and only has the function of passing the flow. Although the heating device does not heat, since the water tank 3 is located above the heating device and the water outlet, when water is added to the water tank, the water still flows from the water tank 3 (usually water at room temperature) into the water inlet pipe 15, the heating device 18, the water outlet pipe 10, the second channel 1102 of the diversion structure in sequence, and flows from the water outlet 404 to the brewing chamber 6. In addition, the first filter element, the second filter element, and the brewing chamber cover in this embodiment are all detachably assembled on the brewing chamber, so the user can install one or more of the first filter element, the second filter element, and the brewing chamber cover in the brewing chamber as needed, or install and remove one or more of the first filter element, the second filter element, and the brewing chamber cover from the brewing chamber. Or the first filter element, the second filter element, and the brewing chamber cover may be of various types, and the user may replace different first filters, second filters, and brewing chamber covers as needed.

[0067] In this embodiment, when the circulating preheating coffee pot is used to brew hot coffee, it is not necessary to use the brewing chamber cover in this embodiment, so the cold water driving unit 005 is not used to open the water outlet. Instead, the first driving unit 111 drives the water outlet switch 402 to open the water outlet. Of course, in other embodiments, it is not necessary to set the cold water driving unit 005 on the brewing chamber cover, but the driving device can be controlled by a button and a control device to drive the water outlet switch. In this field, using a button and a control device to control the driving device is common knowledge and will not be repeated here.

[0068] Example 4

[0069] This embodiment is basically the same as the embodiment 1, except that the specific structure of the diversion structure is slightly different. Figure 1-9 , the first end 1004 of the water outlet pipe 10 is connected to the heating device 18, and the second end 1001 of the water outlet pipe 10 is connected to the diversion structure, and the diversion structure includes a first branch 110 and a second branch 120. The water outlet pipe 10 is connected to the water tank 3 through the first branch 110 so that the water tank 3, the water inlet pipe 15, the heating device 18, the water outlet pipe 10, and the first branch 110 are connected in sequence and can form a circulation pipeline. The diversion structure has a water inlet 406, a first water outlet, and a second water outlet 404. The water inlet 406 and the first water outlet are connected to form the first branch 110, and the water inlet 406 and the second water outlet 404 are connected to form the second branch 120. However, in this embodiment, the diversion structure has a total channel 160, see Fig.16, the first branch 110 and the second branch 120 share a main channel 160, that is, the water inlet 406, the main channel 160, and the first water outlet 205 form the first branch 110; the water inlet 406, the main channel 160, and the second water outlet 404 form the second branch 120. The main channel 160 is arranged at the bottom of the water tank, one end of the main channel 160 is provided with a water inlet 406, the other end is provided with a first water outlet 205, and the side wall of the main channel is provided with a second water outlet 404. The second end 1001 of the water outlet pipe 10 is connected to the water inlet 406, the first water outlet 205 is connected to the water tank 3, and the second water outlet 404 is located above the opening of the brewing chamber 6.

Claims

1. A circulating preheating coffee pot, comprising a main body, a brewing chamber, a water supply device, a heating device, a water inlet pipe, and a water outlet pipe respectively installed on the main body, characterized in that: It also includes a control device, a driving device, and a diversion structure installed on the main body, the water supply device is connected to the heating device through a water inlet pipe, the water supply device is configured to supply water to the heating device through the water inlet pipe, the first end of the water outlet pipe is connected to the heating device, the second end of the water outlet pipe is connected to the diversion structure, the diversion structure includes a first branch and a second branch, the water outlet pipe is connected to the water supply device through the first branch so that the water supply device, the water inlet pipe, the heating device, the water outlet pipe, and the first branch are connected in sequence and can form a circulation pipeline, a one-way valve device is provided on the circulation pipeline to limit the direction of the water flow, or a water pump is provided on the circulation pipeline to limit the direction of the water flow. The direction of water flow is determined; the heating device is used to preheat or heat the water flowing into the heating device, the second branch is provided with a water outlet switch, the water outlet switch is used to open or close the second branch, so that when the water outlet switch is turned on, the water outlet pipe is connected with the brewing chamber through the second branch, and when the water outlet switch is closed, the water outlet pipe is not connected with the brewing chamber, the control device is electrically connected to the driving device, and the control device is configured to control the driving device to drive the water outlet switch to open, so that water flows from the water outlet pipe through the second branch into the brewing chamber, and the water can circulate in the circulation pipeline during the process of preheating the water by the heating device; The water supply device comprises a water tank mounted on the main body, the water tank is connected to the heating device via a water inlet pipe, the water tank is arranged such that the bottom of the water tank is higher than the bottom of the heating device, the water outlet pipe is connected to the water tank via a first branch so that the water tank, the water inlet pipe, the heating device, the water outlet pipe and the first branch can together form a circulation pipeline; The water supply device includes a water tank installed on the main body, and the circulating preheating coffee pot includes a water pump and a one-way valve device installed on the main body. The water pump is configured to pump water in the water tank to the heating device, so that the water flows back to the water tank or the brewing chamber through the heating device, the water outlet pipe, and the diversion structure.

2. A circulating preheating coffee maker according to claim 1, characterized in that: A reflux switch is provided on the first branch, and the reflux switch is used to open or close the first branch.

3. The circulating preheating coffee maker according to claim 1, characterized in that: The control device includes a first temperature controller, the circulating preheating coffee pot includes a power board installed on the main body, and the first temperature controller and the driving device are electrically connected to the power board respectively.

4. The circulating preheating coffee maker according to claim 1, characterized in that: The brewing chamber is detachably connected to the water tank, a discharge port for discharging coffee is provided at the bottom of the brewing chamber, and a first filter is provided in the brewing chamber, which is configured so that the coffee can be filtered by the first filter before flowing out of the brewing chamber through the discharge port.

5. The circulating preheating coffee maker according to claim 4, characterized in that: The driving device comprises a driving member, and a motor or a solenoid valve. The motor or the solenoid valve is arranged on the main body. The solenoid valve or the motor is connected to the driving member to drive the driving member to move.

6. The circulating preheating coffee maker according to claim 5, characterized in that: The discharge port is provided with a discharge switch, and the discharge switch is used to open or close the discharge port.

7. The circulating preheating coffee maker according to claim 6, characterized in that: The driving member is provided with a first driving part and a second driving part. The first driving part is located at a position corresponding to the water outlet switch and is used to drive the water outlet switch to open. The second driving part is located at a position corresponding to the discharge switch and is used to drive the discharge switch to open.

8. The circulating preheating coffee maker according to claim 1, characterized in that: The diversion structure is provided at the bottom of the water tank. The first branch of the diversion structure includes a first channel arranged to penetrate the bottom of the water tank. The second branch of the diversion structure is a second channel arranged at the bottom of the water tank and extending transversely.

9. The circulating preheating coffee maker according to claim 8, characterized in that: The diversion structure also includes a hollow water outlet located in the water tank, the hollow water outlet having a hollow water outlet outlet and a hollow water outlet inlet, the hollow water outlet inlet is sleeved with the first channel, a reflux switch is provided at the hollow water outlet, the reflux switch is a movable valve, and the movable valve is used to open or close the hollow water outlet.

10. The circulating preheating coffee maker according to claim 4, characterized in that: The first filter is arranged in the brewing chamber before the discharge port, and the brewing chamber is also provided with a second filter, which is located at the discharge port.

11. The circulating preheating coffee maker according to claim 4, characterized in that: The invention also comprises a container for holding coffee liquid, wherein the container is located below the discharge port, and the container has a container opening, and a third filter is arranged at the container opening.

12. The circulating preheating coffee maker according to claim 1, characterized in that: The circulating preheating coffee pot also includes an air supply device and an air guide component. The air supply device is arranged on the main body. The air supply device is connected to the brewing chamber through the air guide component and is used to supply air to the brewing chamber, so that when the brewing chamber contains water and coffee powder, the air supply device can supply air to the liquid formed by the mixture of water and coffee powder.

13. The circulating preheating coffee maker according to claim 12, characterized in that: The air guide component includes a first air guide tube and a second air guide tube, the first air guide tube has a first air guide tube first end and a first air guide tube second end, the second air guide tube has a second air guide tube first end and a second air guide tube second end, a brewing chamber opening is provided on the top of the brewing chamber, the first end of the first air guide tube is connected to the air supply device, the second end of the first air guide tube is detachably connected to the first end of the second air guide tube, and the second end of the second air guide tube is inserted into the brewing chamber through the brewing chamber opening.

14. The circulating preheating coffee maker according to claim 12, characterized in that: A discharge port for discharging coffee is provided at the bottom of the brewing chamber, and the brewing chamber is provided with a first filter, which is configured to allow the coffee to be filtered by the first filter before flowing out of the brewing chamber through the discharge port; a discharge switch is provided at the discharge port, and the discharge switch is used to open or close the discharge port.

15. The circulating preheating coffee maker according to claim 14, characterized in that: The driving device includes a driving member, and a motor or a solenoid valve, wherein the motor or the solenoid valve is arranged on the main body, and the solenoid valve or the motor is connected to the driving member to drive the driving member to move; the driving member is provided with a first driving part and a second driving part, wherein the first driving part is located at a position corresponding to the water outlet switch and is used to drive the water outlet switch to open; the second driving part is located at a position corresponding to the discharge switch and is used to drive the discharge switch to open.

16. The circulating preheating coffee maker according to claim 12, characterized in that: The brewing cavity opening is provided with a brewing cavity cover which can cover the brewing cavity opening, and the brewing cavity is provided with a plurality of air holes.

17. The circulating preheating coffee maker according to claim 13, characterized in that: The brewing chamber cover is provided with the second air duct, which includes a cavity and a tube portion connected to the cavity. The cavity is provided in the brewing chamber cover, and the cavity is connected to the second end of the first air duct. The brewing chamber cover is provided with the tube portion extending downward from the brewing chamber cover, so that when the brewing chamber cover is closed with the brewing chamber opening, the tube portion extends into the brewing chamber.

18. The circulating preheating coffee maker according to claim 13, characterized in that: The second air guide tube passes through the brewing cavity opening, and the second end of the second air guide tube is arranged in the brewing cavity at a position lower than the middle of the brewing cavity.

19. A method for operating a circulating preheating coffee maker according to any one of claims 1 to 11, characterized in that: The method comprises the following steps: a. adding coffee powder to the brewing chamber; b. adding water to the water supply device; c. starting the heating device, so that the water circulates in the circulation pipeline and is preheated to a set temperature by the heating device; d. When the water in the water supply device is preheated to the set temperature, the control device controls the driving device to start, and the driving device drives the water outlet switch to open, and the water flows from the water outlet pipe through the second branch into the brewing chamber.

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